Merge branch 'main' into vb/remove-assertion

docs/docs/tutorials/introduction.ipynb

@@ -2043,7 +2043,7 @@
     "\n",
     "So far, we've relied on a simple state (it's just a list of messages!). You can go far with this simple state, but if you want to define complex behavior without relying on the message list, you can add additional fields to the state. In this section, we will extend our chat bot with a new node to illustrate this.\n",
     "\n",
-    "In the examples above, we involved a human deterministically: the graph __always__ interrupted whenever an tool was invoked. Suppose we wanted our chat bot to have the choice of relying on a human.\n",
+    "In the examples above, we involved a human deterministically: the graph __always__ interrupted whenever a tool was invoked. Suppose we wanted our chat bot to have the choice of relying on a human.\n",
     "\n",
     "One way to do this is to create a passthrough \"human\" node, before which the graph will always stop. We will only execute this node if the LLM invokes a \"human\" tool. For our convenience, we will include an \"ask_human\" flag in our graph state that we will flip if the LLM calls this tool.\n",
     "\n",

libs/checkpoint-postgres/langgraph/checkpoint/postgres/__init__.py

@@ -1,6 +1,6 @@
 import threading
 from contextlib import contextmanager
-from typing import Any, Iterator, Optional, Sequence, Union
+from typing import Any, Iterator, Optional, Sequence
 
 from langchain_core.runnables import RunnableConfig
 from psycopg import Capabilities, Connection, Cursor, Pipeline
@@ -17,21 +17,11 @@ from langgraph.checkpoint.base import (
     CheckpointTuple,
     get_checkpoint_id,
 )
+from langgraph.checkpoint.postgres import _internal
 from langgraph.checkpoint.postgres.base import BasePostgresSaver
 from langgraph.checkpoint.serde.base import SerializerProtocol
 
-Conn = Union[Connection[DictRow], ConnectionPool[Connection[DictRow]]]
-
-
-@contextmanager
-def _get_connection(conn: Conn) -> Iterator[Connection[DictRow]]:
-    if isinstance(conn, Connection):
-        yield conn
-    elif isinstance(conn, ConnectionPool):
-        with conn.connection() as conn:
-            yield conn
-    else:
-        raise TypeError(f"Invalid connection type: {type(conn)}")
+Conn = _internal.Conn  # For backward compatibility
 
 
 class PostgresSaver(BasePostgresSaver):
@@ -39,7 +29,7 @@ class PostgresSaver(BasePostgresSaver):
 
     def __init__(
         self,
-        conn: Conn,
+        conn: _internal.Conn,
         pipe: Optional[Pipeline] = None,
         serde: Optional[SerializerProtocol] = None,
     ) -> None:
@@ -73,9 +63,9 @@ class PostgresSaver(BasePostgresSaver):
         ) as conn:
             if pipeline:
                 with conn.pipeline() as pipe:
-                    yield PostgresSaver(conn, pipe)
+                    yield cls(conn, pipe)
             else:
-                yield PostgresSaver(conn)
+                yield cls(conn)
 
     def setup(self) -> None:
         """Set up the checkpoint database asynchronously.
@@ -373,7 +363,7 @@ class PostgresSaver(BasePostgresSaver):
                 Will be applied regardless of whether the PostgresSaver instance was initialized with a pipeline.
                 If pipeline mode is not supported, will fall back to using transaction context manager.
         """
-        with _get_connection(self.conn) as conn:
+        with _internal.get_connection(self.conn) as conn:
             if self.pipe:
                 # a connection in pipeline mode can be used concurrently
                 # in multiple threads/coroutines, but only one cursor can be
@@ -403,4 +393,4 @@ class PostgresSaver(BasePostgresSaver):
                     yield cur
 
 
-__all__ = ["PostgresSaver", "Conn"]
+__all__ = ["PostgresSaver", "BasePostgresSaver", "Conn"]

libs/checkpoint-postgres/langgraph/checkpoint/postgres/_ainternal.py

@@ -0,0 +1,23 @@
+"""Shared async utility functions for the Postgres checkpoint & storage classes."""
+
+from contextlib import asynccontextmanager
+from typing import AsyncIterator, Union
+
+from psycopg import AsyncConnection
+from psycopg.rows import DictRow
+from psycopg_pool import AsyncConnectionPool
+
+Conn = Union[AsyncConnection[DictRow], AsyncConnectionPool[AsyncConnection[DictRow]]]
+
+
+@asynccontextmanager
+async def get_connection(
+    conn: Conn,
+) -> AsyncIterator[AsyncConnection[DictRow]]:
+    if isinstance(conn, AsyncConnection):
+        yield conn
+    elif isinstance(conn, AsyncConnectionPool):
+        async with conn.connection() as conn:
+            yield conn
+    else:
+        raise TypeError(f"Invalid connection type: {type(conn)}")

libs/checkpoint-postgres/langgraph/checkpoint/postgres/_internal.py

@@ -0,0 +1,21 @@
+"""Shared utility functions for the Postgres checkpoint & storage classes."""
+
+from contextlib import contextmanager
+from typing import Iterator, Union
+
+from psycopg import Connection
+from psycopg.rows import DictRow
+from psycopg_pool import ConnectionPool
+
+Conn = Union[Connection[DictRow], ConnectionPool[Connection[DictRow]]]
+
+
+@contextmanager
+def get_connection(conn: Conn) -> Iterator[Connection[DictRow]]:
+    if isinstance(conn, Connection):
+        yield conn
+    elif isinstance(conn, ConnectionPool):
+        with conn.connection() as conn:
+            yield conn
+    else:
+        raise TypeError(f"Invalid connection type: {type(conn)}")

libs/checkpoint-postgres/langgraph/checkpoint/postgres/aio.py

@@ -1,6 +1,6 @@
 import asyncio
 from contextlib import asynccontextmanager
-from typing import Any, AsyncIterator, Iterator, Optional, Sequence, Union
+from typing import Any, AsyncIterator, Iterator, Optional, Sequence
 
 from langchain_core.runnables import RunnableConfig
 from psycopg import AsyncConnection, AsyncCursor, AsyncPipeline, Capabilities
@@ -17,23 +17,11 @@ from langgraph.checkpoint.base import (
     CheckpointTuple,
     get_checkpoint_id,
 )
+from langgraph.checkpoint.postgres import _ainternal
 from langgraph.checkpoint.postgres.base import BasePostgresSaver
 from langgraph.checkpoint.serde.base import SerializerProtocol
 
-Conn = Union[AsyncConnection[DictRow], AsyncConnectionPool[AsyncConnection[DictRow]]]
-
-
-@asynccontextmanager
-async def _get_connection(
-    conn: Conn,
-) -> AsyncIterator[AsyncConnection[DictRow]]:
-    if isinstance(conn, AsyncConnection):
-        yield conn
-    elif isinstance(conn, AsyncConnectionPool):
-        async with conn.connection() as conn:
-            yield conn
-    else:
-        raise TypeError(f"Invalid connection type: {type(conn)}")
+Conn = _ainternal.Conn  # For backward compatibility
 
 
 class AsyncPostgresSaver(BasePostgresSaver):
@@ -41,7 +29,7 @@ class AsyncPostgresSaver(BasePostgresSaver):
 
     def __init__(
         self,
-        conn: Conn,
+        conn: _ainternal.Conn,
         pipe: Optional[AsyncPipeline] = None,
         serde: Optional[SerializerProtocol] = None,
     ) -> None:
@@ -80,9 +68,9 @@ class AsyncPostgresSaver(BasePostgresSaver):
         ) as conn:
             if pipeline:
                 async with conn.pipeline() as pipe:
-                    yield AsyncPostgresSaver(conn=conn, pipe=pipe, serde=serde)
+                    yield cls(conn=conn, pipe=pipe, serde=serde)
             else:
-                yield AsyncPostgresSaver(conn=conn, serde=serde)
+                yield cls(conn=conn, serde=serde)
 
     async def setup(self) -> None:
         """Set up the checkpoint database asynchronously.
@@ -157,15 +145,17 @@ class AsyncPostgresSaver(BasePostgresSaver):
                         value["pending_sends"],
                     ),
                     self._load_metadata(value["metadata"]),
-                    {
-                        "configurable": {
-                            "thread_id": value["thread_id"],
-                            "checkpoint_ns": value["checkpoint_ns"],
-                            "checkpoint_id": value["parent_checkpoint_id"],
+                    (
+                        {
+                            "configurable": {
+                                "thread_id": value["thread_id"],
+                                "checkpoint_ns": value["checkpoint_ns"],
+                                "checkpoint_id": value["parent_checkpoint_id"],
+                            }
                         }
-                    }
-                    if value["parent_checkpoint_id"]
-                    else None,
+                        if value["parent_checkpoint_id"]
+                        else None
+                    ),
                     await asyncio.to_thread(self._load_writes, value["pending_writes"]),
                 )
 
@@ -216,15 +206,17 @@ class AsyncPostgresSaver(BasePostgresSaver):
                         value["pending_sends"],
                     ),
                     self._load_metadata(value["metadata"]),
-                    {
-                        "configurable": {
-                            "thread_id": thread_id,
-                            "checkpoint_ns": checkpoint_ns,
-                            "checkpoint_id": value["parent_checkpoint_id"],
+                    (
+                        {
+                            "configurable": {
+                                "thread_id": thread_id,
+                                "checkpoint_ns": checkpoint_ns,
+                                "checkpoint_id": value["parent_checkpoint_id"],
+                            }
                         }
-                    }
-                    if value["parent_checkpoint_id"]
-                    else None,
+                        if value["parent_checkpoint_id"]
+                        else None
+                    ),
                     await asyncio.to_thread(self._load_writes, value["pending_writes"]),
                 )
 
@@ -331,7 +323,7 @@ class AsyncPostgresSaver(BasePostgresSaver):
                 Will be applied regardless of whether the AsyncPostgresSaver instance was initialized with a pipeline.
                 If pipeline mode is not supported, will fall back to using transaction context manager.
         """
-        async with _get_connection(self.conn) as conn:
+        async with _ainternal.get_connection(self.conn) as conn:
             if self.pipe:
                 # a connection in pipeline mode can be used concurrently
                 # in multiple threads/coroutines, but only one cursor can be
@@ -467,3 +459,6 @@ class AsyncPostgresSaver(BasePostgresSaver):
         return asyncio.run_coroutine_threadsafe(
             self.aput_writes(config, writes, task_id), self.loop
         ).result()
+
+
+__all__ = ["AsyncPostgresSaver", "Conn"]

libs/checkpoint-postgres/langgraph/store/postgres/aio.py

@@ -13,14 +13,17 @@ from typing import (
 )
 
 import orjson
-from psycopg import AsyncConnection, AsyncCursor
+from psycopg import AsyncConnection, AsyncCursor, AsyncPipeline, Capabilities
 from psycopg.errors import UndefinedTable
-from psycopg.rows import dict_row
+from psycopg.rows import DictRow, dict_row
+from psycopg_pool import AsyncConnectionPool
 
+from langgraph.checkpoint.postgres import _ainternal
 from langgraph.store.base import GetOp, ListNamespacesOp, Op, PutOp, Result, SearchOp
 from langgraph.store.base.batch import AsyncBatchedBaseStore
 from langgraph.store.postgres.base import (
     BasePostgresStore,
+    PoolConfig,
     Row,
     _decode_ns_bytes,
     _group_ops,
@@ -30,81 +33,88 @@ from langgraph.store.postgres.base import (
 logger = logging.getLogger(__name__)
 
 
-class AsyncPostgresStore(AsyncBatchedBaseStore, BasePostgresStore[AsyncConnection]):
-    __slots__ = ("_deserializer",)
+class AsyncPostgresStore(AsyncBatchedBaseStore, BasePostgresStore[_ainternal.Conn]):
+    __slots__ = ("_deserializer", "pipe", "lock", "supports_pipeline")
 
     def __init__(
         self,
-        conn: AsyncConnection[Any],
+        conn: _ainternal.Conn,
         *,
+        pipe: Optional[AsyncPipeline] = None,
         deserializer: Optional[
             Callable[[Union[bytes, orjson.Fragment]], dict[str, Any]]
         ] = None,
     ) -> None:
+        if isinstance(conn, AsyncConnectionPool) and pipe is not None:
+            raise ValueError(
+                "Pipeline should be used only with a single AsyncConnection, not AsyncConnectionPool."
+            )
         super().__init__()
         self._deserializer = deserializer
         self.conn = conn
+        self.pipe = pipe
+        self.lock = asyncio.Lock()
         self.loop = asyncio.get_running_loop()
+        self.supports_pipeline = Capabilities().has_pipeline()
 
     async def abatch(self, ops: Iterable[Op]) -> list[Result]:
         grouped_ops, num_ops = _group_ops(ops)
         results: list[Result] = [None] * num_ops
 
-        async with self.conn.pipeline():
-            tasks = []
-
-            if GetOp in grouped_ops:
-                tasks.append(
-                    self._batch_get_ops(
-                        cast(Sequence[tuple[int, GetOp]], grouped_ops[GetOp]), results
-                    )
-                )
-
-            if PutOp in grouped_ops:
-                tasks.append(
-                    self._batch_put_ops(
-                        cast(Sequence[tuple[int, PutOp]], grouped_ops[PutOp])
-                    )
-                )
-
-            if SearchOp in grouped_ops:
-                tasks.append(
-                    self._batch_search_ops(
-                        cast(Sequence[tuple[int, SearchOp]], grouped_ops[SearchOp]),
-                        results,
-                    )
-                )
-
-            if ListNamespacesOp in grouped_ops:
-                tasks.append(
-                    self._batch_list_namespaces_ops(
-                        cast(
-                            Sequence[tuple[int, ListNamespacesOp]],
-                            grouped_ops[ListNamespacesOp],
-                        ),
-                        results,
-                    )
-                )
-
-            await asyncio.gather(*tasks)
+        async with _ainternal.get_connection(self.conn) as conn:
+            if self.pipe:
+                async with self.pipe:
+                    await self._execute_batch(grouped_ops, results, conn)
+            else:
+                await self._execute_batch(grouped_ops, results, conn)
 
         return results
 
-    def batch(self, ops: Iterable[Op]) -> list[Result]:
-        return asyncio.run_coroutine_threadsafe(self.abatch(ops), self.loop).result()
+    async def _execute_batch(
+        self,
+        grouped_ops: dict,
+        results: list[Result],
+        conn: AsyncConnection[DictRow],
+    ) -> None:
+        async with self._cursor(conn, pipeline=True) as cur:
+            if GetOp in grouped_ops:
+                await self._batch_get_ops(
+                    cast(Sequence[tuple[int, GetOp]], grouped_ops[GetOp]),
+                    results,
+                    cur,
+                )
+
+            if SearchOp in grouped_ops:
+                await self._batch_search_ops(
+                    cast(Sequence[tuple[int, SearchOp]], grouped_ops[SearchOp]),
+                    results,
+                    cur,
+                )
+
+            if ListNamespacesOp in grouped_ops:
+                await self._batch_list_namespaces_ops(
+                    cast(
+                        Sequence[tuple[int, ListNamespacesOp]],
+                        grouped_ops[ListNamespacesOp],
+                    ),
+                    results,
+                    cur,
+                )
+
+            if PutOp in grouped_ops:
+                await self._batch_put_ops(
+                    cast(Sequence[tuple[int, PutOp]], grouped_ops[PutOp]),
+                    cur,
+                )
 
     async def _batch_get_ops(
         self,
         get_ops: Sequence[tuple[int, GetOp]],
         results: list[Result],
+        cur: AsyncCursor[DictRow],
     ) -> None:
-        cursors = []
         for query, params, namespace, items in self._get_batch_GET_ops_queries(get_ops):
-            cur = self.conn.cursor(binary=True)
             await cur.execute(query, params)
-            cursors.append((cur, namespace, items))
-
-        for cur, namespace, items in cursors:
             rows = cast(list[Row], await cur.fetchall())
             key_to_row = {row["key"]: row for row in rows}
             for idx, key in items:
@@ -119,26 +129,21 @@ class AsyncPostgresStore(AsyncBatchedBaseStore, BasePostgresStore[AsyncConnectio
     async def _batch_put_ops(
         self,
         put_ops: Sequence[tuple[int, PutOp]],
+        cur: AsyncCursor[DictRow],
     ) -> None:
         queries = self._get_batch_PUT_queries(put_ops)
         for query, params in queries:
-            cur = self.conn.cursor(binary=True)
             await cur.execute(query, params)
 
     async def _batch_search_ops(
         self,
         search_ops: Sequence[tuple[int, SearchOp]],
         results: list[Result],
+        cur: AsyncCursor[DictRow],
     ) -> None:
         queries = self._get_batch_search_queries(search_ops)
-        cursors: list[tuple[AsyncCursor[Any], int]] = []
-
         for (query, params), (idx, _) in zip(queries, search_ops):
-            cur = self.conn.cursor(binary=True)
             await cur.execute(query, params)
-            cursors.append((cur, idx))
-
-        for cur, idx in cursors:
             rows = cast(list[Row], await cur.fetchall())
             items = [
                 _row_to_item(
@@ -152,37 +157,103 @@ class AsyncPostgresStore(AsyncBatchedBaseStore, BasePostgresStore[AsyncConnectio
         self,
         list_ops: Sequence[tuple[int, ListNamespacesOp]],
         results: list[Result],
+        cur: AsyncCursor[DictRow],
     ) -> None:
         queries = self._get_batch_list_namespaces_queries(list_ops)
-        cursors: list[tuple[AsyncCursor[Any], int]] = []
         for (query, params), (idx, _) in zip(queries, list_ops):
-            cur = self.conn.cursor(binary=True)
             await cur.execute(query, params)
-            cursors.append((cur, idx))
-
-        for cur, idx in cursors:
             rows = cast(list[dict], await cur.fetchall())
             namespaces = [_decode_ns_bytes(row["truncated_prefix"]) for row in rows]
             results[idx] = namespaces
 
+    @asynccontextmanager
+    async def _cursor(
+        self, conn: AsyncConnection[DictRow], *, pipeline: bool = False
+    ) -> AsyncIterator[AsyncCursor[Any]]:
+        """Create a database cursor as a context manager.
+
+        Args:
+            conn: The database connection to use
+            pipeline: whether to use pipeline for the DB operations inside the context manager.
+                Will be applied regardless of whether the PostgresStore instance was initialized with a pipeline.
+                If pipeline mode is not supported, will fall back to using transaction context manager.
+        """
+        if self.pipe:
+            # a connection in pipeline mode can be used concurrently
+            # in multiple threads/coroutines, but only one cursor can be
+            # used at a time
+            async with conn.cursor(binary=True) as cur:
+                try:
+                    yield cur
+                finally:
+                    if pipeline:
+                        await self.pipe.sync()
+        elif pipeline:
+            # a connection not in pipeline mode can only be used by one
+            # thread/coroutine at a time, so we acquire a lock
+            if self.supports_pipeline:
+                async with self.lock, conn.pipeline(), conn.cursor(binary=True) as cur:
+                    yield cur
+            else:
+                async with self.lock, conn.transaction(), conn.cursor(
+                    binary=True
+                ) as cur:
+                    yield cur
+        else:
+            async with conn.cursor(binary=True) as cur:
+                yield cur
+
+    def batch(self, ops: Iterable[Op]) -> list[Result]:
+        return asyncio.run_coroutine_threadsafe(self.abatch(ops), self.loop).result()
+
     @classmethod
     @asynccontextmanager
     async def from_conn_string(
         cls,
         conn_string: str,
+        *,
+        pipeline: bool = False,
+        pool_config: Optional[PoolConfig] = None,
     ) -> AsyncIterator["AsyncPostgresStore"]:
         """Create a new AsyncPostgresStore instance from a connection string.
 
         Args:
             conn_string (str): The Postgres connection info string.
+            pipeline (bool): Whether to use AsyncPipeline (only for single connections)
+            pool_config (Optional[PoolConfig]): Configuration for the connection pool.
+                If provided, will create a connection pool and use it instead of a single connection.
+                This overrides the `pipeline` argument.
 
         Returns:
             AsyncPostgresStore: A new AsyncPostgresStore instance.
         """
-        async with await AsyncConnection.connect(
-            conn_string, autocommit=True, prepare_threshold=0, row_factory=dict_row
-        ) as conn:
-            yield cls(conn=conn)
+        if pool_config is not None:
+            pc = pool_config.copy()
+            async with cast(
+                AsyncConnectionPool[AsyncConnection[DictRow]],
+                AsyncConnectionPool(
+                    conn_string,
+                    min_size=pc.pop("min_size", 1),
+                    max_size=pc.pop("max_size", None),
+                    kwargs={
+                        "autocommit": True,
+                        "prepare_threshold": 0,
+                        "row_factory": dict_row,
+                        **(pc.pop("kwargs", None) or {}),
+                    },
+                    **cast(dict, pc),
+                ),
+            ) as pool:
+                yield cls(conn=pool)
+        else:
+            async with await AsyncConnection.connect(
+                conn_string, autocommit=True, prepare_threshold=0, row_factory=dict_row
+            ) as conn:
+                if pipeline:
+                    async with conn.pipeline() as pipe:
+                        yield cls(conn=conn, pipe=pipe)
+                else:
+                    yield cls(conn=conn)
 
     async def setup(self) -> None:
         """Set up the store database asynchronously.
@@ -191,28 +262,33 @@ class AsyncPostgresStore(AsyncBatchedBaseStore, BasePostgresStore[AsyncConnectio
         already exist and runs database migrations. It MUST be called directly by the user
         the first time the store is used.
         """
-        async with self.conn.cursor() as cur:
-            try:
-                await cur.execute(
-                    "SELECT v FROM store_migrations ORDER BY v DESC LIMIT 1"
-                )
-                row = cast(dict, await cur.fetchone())
-                if row is None:
-                    version = -1
-                else:
-                    version = row["v"]
-            except UndefinedTable:
-                version = -1
-                # Create store_migrations table if it doesn't exist
-                await cur.execute(
-                    """
-                    CREATE TABLE IF NOT EXISTS store_migrations (
-                        v INTEGER PRIMARY KEY
+        async with _ainternal.get_connection(self.conn) as conn:
+            async with conn.cursor() as cur:
+                try:
+                    await cur.execute(
+                        "SELECT v FROM store_migrations ORDER BY v DESC LIMIT 1"
                     )
-                    """
-                )
-            for v, migration in enumerate(
-                self.MIGRATIONS[version + 1 :], start=version + 1
-            ):
-                await cur.execute(migration)
-                await cur.execute("INSERT INTO store_migrations (v) VALUES (%s)", (v,))
+                    row = cast(dict, await cur.fetchone())
+                    if row is None:
+                        version = -1
+                    else:
+                        version = row["v"]
+                except UndefinedTable:
+                    version = -1
+                    # Create store_migrations table if it doesn't exist
+                    await cur.execute(
+                        """
+                        CREATE TABLE IF NOT EXISTS store_migrations (
+                            v INTEGER PRIMARY KEY
+                        )
+                        """
+                    )
+                for v, migration in enumerate(
+                    self.MIGRATIONS[version + 1 :], start=version + 1
+                ):
+                    await cur.execute(migration)
+                    await cur.execute(
+                        "INSERT INTO store_migrations (v) VALUES (%s)", (v,)
+                    )
+            if self.pipe:
+                await self.pipe.sync()

libs/checkpoint-postgres/langgraph/store/postgres/base.py

@@ -1,6 +1,7 @@
 import asyncio
 import json
 import logging
+import threading
 from collections import defaultdict
 from contextlib import contextmanager
 from datetime import datetime
@@ -18,12 +19,15 @@ from typing import (
 )
 
 import orjson
-from psycopg import BaseConnection, Connection, Cursor
+from psycopg import Capabilities, Connection, Cursor, Pipeline
 from psycopg.errors import UndefinedTable
-from psycopg.rows import dict_row
+from psycopg.rows import DictRow, dict_row
 from psycopg.types.json import Jsonb
+from psycopg_pool import ConnectionPool
 from typing_extensions import TypedDict
 
+from langgraph.checkpoint.postgres import _ainternal as _ainternal
+from langgraph.checkpoint.postgres import _internal as _pg_internal
 from langgraph.store.base import (
     BaseStore,
     GetOp,
@@ -56,7 +60,32 @@ CREATE INDEX IF NOT EXISTS store_prefix_idx ON store USING btree (prefix text_pa
 """,
 ]
 
-C = TypeVar("C", bound=BaseConnection)
+C = TypeVar("C", bound=Union[_pg_internal.Conn, _ainternal.Conn])
+
+
+class PoolConfig(TypedDict, total=False):
+    """Connection pool settings for PostgreSQL connections.
+
+    Controls connection lifecycle and resource utilization:
+    - Small pools (1-5) suit low-concurrency workloads
+    - Larger pools handle concurrent requests but consume more resources
+    - Setting max_size prevents resource exhaustion under load
+    """
+
+    min_size: int
+    """Minimum number of connections maintained in the pool. Defaults to 1."""
+
+    max_size: Optional[int]
+    """Maximum number of connections allowed in the pool. None means unlimited."""
+
+    kwargs: dict
+    """Additional connection arguments passed to each connection in the pool.
+    
+    Default kwargs set automatically:
+    - autocommit: True
+    - prepare_threshold: 0
+    - row_factory: dict_row
+    """
 
 
 class BasePostgresStore(Generic[C]):
@@ -88,9 +117,14 @@ class BasePostgresStore(Generic[C]):
         self,
         put_ops: Sequence[tuple[int, PutOp]],
     ) -> list[tuple[str, Sequence]]:
+        # Last-write wins
+        dedupped_ops: dict[tuple[tuple[str, ...], str], PutOp] = {}
+        for _, op in put_ops:
+            dedupped_ops[(op.namespace, op.key)] = op
+
         inserts: list[PutOp] = []
         deletes: list[PutOp] = []
-        for _, op in put_ops:
+        for op in dedupped_ops.values():
             if op.value is None:
                 deletes.append(op)
             else:
@@ -219,13 +253,14 @@ class BasePostgresStore(Generic[C]):
         return queries
 
 
-class PostgresStore(BaseStore, BasePostgresStore[Connection]):
-    __slots__ = ("_deserializer",)
+class PostgresStore(BaseStore, BasePostgresStore[_pg_internal.Conn]):
+    __slots__ = ("_deserializer", "pipe", "lock", "supports_pipeline")
 
     def __init__(
         self,
-        conn: Connection[Any],
+        conn: _pg_internal.Conn,
         *,
+        pipe: Optional[Pipeline] = None,
         deserializer: Optional[
             Callable[[Union[bytes, orjson.Fragment]], dict[str, Any]]
         ] = None,
@@ -233,26 +268,110 @@ class PostgresStore(BaseStore, BasePostgresStore[Connection]):
         super().__init__()
         self._deserializer = deserializer
         self.conn = conn
+        self.pipe = pipe
+        self.supports_pipeline = Capabilities().has_pipeline()
+        self.lock = threading.Lock()
+
+    @classmethod
+    @contextmanager
+    def from_conn_string(
+        cls,
+        conn_string: str,
+        *,
+        pipeline: bool = False,
+        pool_config: Optional[PoolConfig] = None,
+    ) -> Iterator["PostgresStore"]:
+        """Create a new PostgresStore instance from a connection string.
+
+        Args:
+            conn_string (str): The Postgres connection info string.
+            pipeline (bool): whether to use Pipeline (only for single connections)
+            pool_config (Optional[PoolArgs]): Configuration for the connection pool.
+                If provided, will create a connection pool and use it instead of a single connection.
+                This overrides the `pipeline` argument.
+        Returns:
+            PostgresStore: A new PostgresStore instance.
+        """
+        if pool_config is not None:
+            pc = pool_config.copy()
+            with cast(
+                ConnectionPool[Connection[DictRow]],
+                ConnectionPool(
+                    conn_string,
+                    min_size=pc.pop("min_size", 1),
+                    max_size=pc.pop("max_size", None),
+                    kwargs={
+                        "autocommit": True,
+                        "prepare_threshold": 0,
+                        "row_factory": dict_row,
+                        **(pc.pop("kwargs", None) or {}),
+                    },
+                    **cast(dict, pc),
+                ),
+            ) as pool:
+                yield cls(conn=pool)
+        else:
+            with Connection.connect(
+                conn_string, autocommit=True, prepare_threshold=0, row_factory=dict_row
+            ) as conn:
+                if pipeline:
+                    with conn.pipeline() as pipe:
+                        yield cls(conn, pipe=pipe)
+                else:
+                    yield cls(conn)
+
+    @contextmanager
+    def _cursor(self, *, pipeline: bool = False) -> Iterator[Cursor[DictRow]]:
+        """Create a database cursor as a context manager.
+
+        Args:
+            pipeline (bool): whether to use pipeline for the DB operations inside the context manager.
+                Will be applied regardless of whether the PostgresStore instance was initialized with a pipeline.
+                If pipeline mode is not supported, will fall back to using transaction context manager.
+        """
+        with _pg_internal.get_connection(self.conn) as conn:
+            if self.pipe:
+                # a connection in pipeline mode can be used concurrently
+                # in multiple threads/coroutines, but only one cursor can be
+                # used at a time
+                try:
+                    with conn.cursor(binary=True, row_factory=dict_row) as cur:
+                        yield cur
+                finally:
+                    if pipeline:
+                        self.pipe.sync()
+            elif pipeline:
+                # a connection not in pipeline mode can only be used by one
+                # thread/coroutine at a time, so we acquire a lock
+                if self.supports_pipeline:
+                    with self.lock, conn.pipeline(), conn.cursor(
+                        binary=True, row_factory=dict_row
+                    ) as cur:
+                        yield cur
+                else:
+                    with self.lock, conn.transaction(), conn.cursor(
+                        binary=True, row_factory=dict_row
+                    ) as cur:
+                        yield cur
+            else:
+                with conn.cursor(binary=True, row_factory=dict_row) as cur:
+                    yield cur
 
     def batch(self, ops: Iterable[Op]) -> list[Result]:
         grouped_ops, num_ops = _group_ops(ops)
         results: list[Result] = [None] * num_ops
 
-        with self.conn.pipeline():
+        with self._cursor(pipeline=True) as cur:
             if GetOp in grouped_ops:
                 self._batch_get_ops(
-                    cast(Sequence[tuple[int, GetOp]], grouped_ops[GetOp]), results
-                )
-
-            if PutOp in grouped_ops:
-                self._batch_put_ops(
-                    cast(Sequence[tuple[int, PutOp]], grouped_ops[PutOp])
+                    cast(Sequence[tuple[int, GetOp]], grouped_ops[GetOp]), results, cur
                 )
 
             if SearchOp in grouped_ops:
                 self._batch_search_ops(
                     cast(Sequence[tuple[int, SearchOp]], grouped_ops[SearchOp]),
                     results,
+                    cur,
                 )
 
             if ListNamespacesOp in grouped_ops:
@@ -262,25 +381,23 @@ class PostgresStore(BaseStore, BasePostgresStore[Connection]):
                         grouped_ops[ListNamespacesOp],
                     ),
                     results,
+                    cur,
+                )
+            if PutOp in grouped_ops:
+                self._batch_put_ops(
+                    cast(Sequence[tuple[int, PutOp]], grouped_ops[PutOp]), cur
                 )
 
         return results
 
-    async def abatch(self, ops: Iterable[Op]) -> list[Result]:
-        return await asyncio.get_running_loop().run_in_executor(None, self.batch, ops)
-
     def _batch_get_ops(
         self,
         get_ops: Sequence[tuple[int, GetOp]],
         results: list[Result],
+        cur: Cursor[DictRow],
     ) -> None:
-        cursors = []
         for query, params, namespace, items in self._get_batch_GET_ops_queries(get_ops):
-            cur = self.conn.cursor(binary=True)
             cur.execute(query, params)
-            cursors.append((cur, namespace, items))
-
-        for cur, namespace, items in cursors:
             rows = cast(list[Row], cur.fetchall())
             key_to_row = {row["key"]: row for row in rows}
             for idx, key in items:
@@ -295,70 +412,44 @@ class PostgresStore(BaseStore, BasePostgresStore[Connection]):
     def _batch_put_ops(
         self,
         put_ops: Sequence[tuple[int, PutOp]],
+        cur: Cursor[DictRow],
     ) -> None:
         queries = self._get_batch_PUT_queries(put_ops)
         for query, params in queries:
-            cur = self.conn.cursor(binary=True)
             cur.execute(query, params)
 
     def _batch_search_ops(
         self,
         search_ops: Sequence[tuple[int, SearchOp]],
         results: list[Result],
+        cur: Cursor[DictRow],
     ) -> None:
-        queries = self._get_batch_search_queries(search_ops)
-        cursors: list[tuple[Cursor[Any], int]] = []
-
-        for (query, params), (idx, _) in zip(queries, search_ops):
-            cur = self.conn.cursor(binary=True)
+        for (query, params), (idx, _) in zip(
+            self._get_batch_search_queries(search_ops), search_ops
+        ):
             cur.execute(query, params)
-            cursors.append((cur, idx))
-
-        for cur, idx in cursors:
             rows = cast(list[Row], cur.fetchall())
-            items = [
+            results[idx] = [
                 _row_to_item(
                     _decode_ns_bytes(row["prefix"]), row, loader=self._deserializer
                 )
                 for row in rows
             ]
-            results[idx] = items
 
     def _batch_list_namespaces_ops(
         self,
         list_ops: Sequence[tuple[int, ListNamespacesOp]],
         results: list[Result],
+        cur: Cursor[DictRow],
     ) -> None:
-        queries = self._get_batch_list_namespaces_queries(list_ops)
-        cursors: list[tuple[Cursor[Any], int]] = []
-        for (query, params), (idx, _) in zip(queries, list_ops):
-            cur = self.conn.cursor(binary=True)
+        for (query, params), (idx, _) in zip(
+            self._get_batch_list_namespaces_queries(list_ops), list_ops
+        ):
             cur.execute(query, params)
-            cursors.append((cur, idx))
+            results[idx] = [_decode_ns_bytes(row["truncated_prefix"]) for row in cur]
 
-        for cur, idx in cursors:
-            rows = cast(list[dict], cur.fetchall())
-            namespaces = [_decode_ns_bytes(row["truncated_prefix"]) for row in rows]
-            results[idx] = namespaces
-
-    @classmethod
-    @contextmanager
-    def from_conn_string(
-        cls,
-        conn_string: str,
-    ) -> Iterator["PostgresStore"]:
-        """Create a new BasePostgresStore instance from a connection string.
-
-        Args:
-            conn_string (str): The Postgres connection info string.
-
-        Returns:
-            BasePostgresStore: A new BasePostgresStore instance.
-        """
-        with Connection.connect(
-            conn_string, autocommit=True, prepare_threshold=0, row_factory=dict_row
-        ) as conn:
-            yield cls(conn=conn)
+    async def abatch(self, ops: Iterable[Op]) -> list[Result]:
+        return await asyncio.get_running_loop().run_in_executor(None, self.batch, ops)
 
     def setup(self) -> None:
         """Set up the store database.
@@ -367,7 +458,7 @@ class PostgresStore(BaseStore, BasePostgresStore[Connection]):
         already exist and runs database migrations. It MUST be called directly by the user
         the first time the store is used.
         """
-        with self.conn.cursor(binary=True) as cur:
+        with self._cursor() as cur:
             try:
                 cur.execute("SELECT v FROM store_migrations ORDER BY v DESC LIMIT 1")
                 row = cast(dict, cur.fetchone())
@@ -376,9 +467,7 @@ class PostgresStore(BaseStore, BasePostgresStore[Connection]):
                 else:
                     version = row["v"]
             except UndefinedTable:
-                self.conn.rollback()
                 version = -1
-                # Create store_migrations table if it doesn't exist
                 cur.execute(
                     """
                     CREATE TABLE IF NOT EXISTS store_migrations (

libs/checkpoint-postgres/pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langgraph-checkpoint-postgres"
-version = "2.0.3"
+version = "2.0.4"
 description = "Library with a Postgres implementation of LangGraph checkpoint saver."
 authors = []
 license = "MIT"

libs/checkpoint-postgres/tests/conftest.py

@@ -24,6 +24,10 @@ async def clear_test_db(conn: AsyncConnection[DictRow]) -> None:
         await conn.execute("DELETE FROM checkpoint_blobs")
         await conn.execute("DELETE FROM checkpoint_writes")
         await conn.execute("DELETE FROM checkpoint_migrations")
-        await conn.execute("DELETE FROM store_migrations")
+    except UndefinedTable:
+        pass
+    try:
+        await conn.execute("DELETE FROM store_migrations")
+        await conn.execute("DELETE FROM store")
     except UndefinedTable:
         pass

libs/checkpoint-postgres/tests/test_async_store.py

@@ -1,114 +1,76 @@
 # type: ignore
+import sys
 import uuid
-from datetime import datetime
-from typing import Any
-from unittest.mock import AsyncMock, MagicMock
+from typing import AsyncIterator
 
 import pytest
 from conftest import DEFAULT_URI  # type: ignore
+from psycopg import AsyncConnection
 
 from langgraph.store.base import GetOp, Item, ListNamespacesOp, PutOp, SearchOp
 from langgraph.store.postgres import AsyncPostgresStore
 
 
-class MockAsyncCursor:
-    def __init__(self, fetch_result: Any) -> None:
-        self.fetch_result = fetch_result
-        self.execute = AsyncMock()
-        self.fetchall = AsyncMock(return_value=self.fetch_result)
+@pytest.fixture(scope="function", params=["default", "pipe", "pool"])
+async def store(request) -> AsyncIterator[AsyncPostgresStore]:
+    if sys.version_info < (3, 10):
+        pytest.skip("Async Postgres tests require Python 3.10+")
 
+    database = f"test_{uuid.uuid4().hex[:16]}"
+    uri_parts = DEFAULT_URI.split("/")
+    uri_base = "/".join(uri_parts[:-1])
+    query_params = ""
+    if "?" in uri_parts[-1]:
+        db_name, query_params = uri_parts[-1].split("?", 1)
+        query_params = "?" + query_params
 
-class MockAsyncConnection:
-    def __init__(self) -> None:
-        self.cursor = MagicMock()
-        self.pipeline = MagicMock(
-            return_value=AsyncMock(__aenter__=AsyncMock(), __aexit__=AsyncMock())
-        )
+    conn_string = f"{uri_base}/{database}{query_params}"
+    admin_conn_string = DEFAULT_URI
 
+    async with await AsyncConnection.connect(
+        admin_conn_string, autocommit=True
+    ) as conn:
+        await conn.execute(f"CREATE DATABASE {database}")
+    try:
+        async with AsyncPostgresStore.from_conn_string(conn_string) as store:
+            await store.setup()
 
-@pytest.fixture
-def mock_connection() -> MockAsyncConnection:
-    return MockAsyncConnection()
-
-
-@pytest.fixture
-async def store(mock_connection: MockAsyncConnection) -> AsyncPostgresStore:
-    return AsyncPostgresStore(mock_connection)
+        if request.param == "pipe":
+            async with AsyncPostgresStore.from_conn_string(
+                conn_string, pipeline=True
+            ) as store:
+                yield store
+        elif request.param == "pool":
+            async with AsyncPostgresStore.from_conn_string(
+                conn_string, pool_config={"min_size": 1, "max_size": 10}
+            ) as store:
+                yield store
+        else:  # default
+            async with AsyncPostgresStore.from_conn_string(conn_string) as store:
+                yield store
+    finally:
+        async with await AsyncConnection.connect(
+            admin_conn_string, autocommit=True
+        ) as conn:
+            await conn.execute(f"DROP DATABASE {database}")
 
 
 async def test_abatch_order(store: AsyncPostgresStore) -> None:
-    mock_connection = store.conn
-    mock_get_cursor = MockAsyncCursor(
-        [
-            {
-                "key": "key1",
-                "value": '{"data": "value1"}',
-                "created_at": datetime.now(),
-                "updated_at": datetime.now(),
-                "prefix": "test.foo",
-            },
-            {
-                "key": "key2",
-                "value": '{"data": "value2"}',
-                "created_at": datetime.now(),
-                "updated_at": datetime.now(),
-                "prefix": "test.bar",
-            },
-        ]
-    )
-    mock_search_cursor = MockAsyncCursor(
-        [
-            {
-                "key": "key1",
-                "value": '{"data": "value1"}',
-                "created_at": datetime.now(),
-                "updated_at": datetime.now(),
-                "prefix": "test.foo",
-            },
-        ]
-    )
-    mock_list_namespaces_cursor = MockAsyncCursor(
-        [
-            {"truncated_prefix": b"\x01test"},
-        ]
-    )
-
-    failures = []
-
-    def cursor_side_effect(binary: bool = False) -> Any:
-        cursor = MagicMock()
-
-        async def execute_side_effect(query: str, *params: Any) -> None:
-            # My super sophisticated database.
-            if "SELECT prefix, key," in query:
-                cursor.fetchall = mock_search_cursor.fetchall
-            elif "SELECT DISTINCT ON (truncated_prefix)" in query:
-                cursor.fetchall = mock_list_namespaces_cursor.fetchall
-            elif "WHERE prefix = %s AND key" in query:
-                cursor.fetchall = mock_get_cursor.fetchall
-            elif "INSERT INTO " in query:
-                pass
-            else:
-                e = ValueError(f"Unmatched query: {query}")
-                failures.append(e)
-                raise e
-
-        cursor.execute = AsyncMock(side_effect=execute_side_effect)
-        return cursor
-
-    mock_connection.cursor.side_effect = cursor_side_effect  # type: ignore
+    # Setup test data
+    await store.aput(("test", "foo"), "key1", {"data": "value1"})
+    await store.aput(("test", "bar"), "key2", {"data": "value2"})
 
     ops = [
-        GetOp(namespace=("test",), key="key1"),
-        PutOp(namespace=("test",), key="key2", value={"data": "value2"}),
+        GetOp(namespace=("test", "foo"), key="key1"),
+        PutOp(namespace=("test", "bar"), key="key2", value={"data": "value2"}),
         SearchOp(
             namespace_prefix=("test",), filter={"data": "value1"}, limit=10, offset=0
         ),
         ListNamespacesOp(match_conditions=None, max_depth=None, limit=10, offset=0),
         GetOp(namespace=("test",), key="key3"),
     ]
+
     results = await store.abatch(ops)
-    assert not failures
     assert len(results) == 5
     assert isinstance(results[0], Item)
     assert isinstance(results[0].value, dict)
@@ -118,27 +80,29 @@ async def test_abatch_order(store: AsyncPostgresStore) -> None:
     assert isinstance(results[2], list)
     assert len(results[2]) == 1
     assert isinstance(results[3], list)
-    assert results[3] == [("test",)]
+    assert ("test", "foo") in results[3] and ("test", "bar") in results[3]
     assert results[4] is None
 
     ops_reordered = [
         SearchOp(namespace_prefix=("test",), filter=None, limit=5, offset=0),
-        GetOp(namespace=("test",), key="key2"),
+        GetOp(namespace=("test", "bar"), key="key2"),
         ListNamespacesOp(match_conditions=None, max_depth=None, limit=5, offset=0),
         PutOp(namespace=("test",), key="key3", value={"data": "value3"}),
-        GetOp(namespace=("test",), key="key1"),
+        GetOp(namespace=("test", "foo"), key="key1"),
     ]
 
     results_reordered = await store.abatch(ops_reordered)
-    assert not failures
     assert len(results_reordered) == 5
     assert isinstance(results_reordered[0], list)
-    assert len(results_reordered[0]) == 1
+    assert len(results_reordered[0]) == 2
     assert isinstance(results_reordered[1], Item)
     assert results_reordered[1].value == {"data": "value2"}
     assert results_reordered[1].key == "key2"
     assert isinstance(results_reordered[2], list)
-    assert results_reordered[2] == [("test",)]
+    assert ("test", "foo") in results_reordered[2] and (
+        "test",
+        "bar",
+    ) in results_reordered[2]
     assert results_reordered[3] is None
     assert isinstance(results_reordered[4], Item)
     assert results_reordered[4].value == {"data": "value1"}
@@ -146,26 +110,9 @@ async def test_abatch_order(store: AsyncPostgresStore) -> None:
 
 
 async def test_batch_get_ops(store: AsyncPostgresStore) -> None:
-    mock_connection = store.conn
-    mock_cursor = MockAsyncCursor(
-        [
-            {
-                "key": "key1",
-                "value": '{"data": "value1"}',
-                "created_at": datetime.now(),
-                "updated_at": datetime.now(),
-                "prefix": "test.foo",
-            },
-            {
-                "key": "key2",
-                "value": '{"data": "value2"}',
-                "created_at": datetime.now(),
-                "updated_at": datetime.now(),
-                "prefix": "test.bar",
-            },
-        ]
-    )
-    mock_connection.cursor.return_value = mock_cursor
+    # Setup test data
+    await store.aput(("test",), "key1", {"data": "value1"})
+    await store.aput(("test",), "key2", {"data": "value2"})
 
     ops = [
         GetOp(namespace=("test",), key="key1"),
@@ -184,10 +131,6 @@ async def test_batch_get_ops(store: AsyncPostgresStore) -> None:
 
 
 async def test_batch_put_ops(store: AsyncPostgresStore) -> None:
-    mock_connection = store.conn
-    mock_cursor = MockAsyncCursor([])
-    mock_connection.cursor.return_value = mock_cursor
-
     ops = [
         PutOp(namespace=("test",), key="key1", value={"data": "value1"}),
         PutOp(namespace=("test",), key="key2", value={"data": "value2"}),
@@ -198,30 +141,16 @@ async def test_batch_put_ops(store: AsyncPostgresStore) -> None:
 
     assert len(results) == 3
     assert all(result is None for result in results)
-    assert mock_cursor.execute.call_count == 2
+
+    # Verify the puts worked
+    items = await store.asearch(["test"], limit=10)
+    assert len(items) == 2  # key3 had None value so wasn't stored
 
 
 async def test_batch_search_ops(store: AsyncPostgresStore) -> None:
-    mock_connection = store.conn
-    mock_cursor = MockAsyncCursor(
-        [
-            {
-                "key": "key1",
-                "value": '{"data": "value1"}',
-                "created_at": datetime.now(),
-                "updated_at": datetime.now(),
-                "prefix": "test.foo",
-            },
-            {
-                "key": "key2",
-                "value": '{"data": "value2"}',
-                "created_at": datetime.now(),
-                "updated_at": datetime.now(),
-                "prefix": "test.bar",
-            },
-        ]
-    )
-    mock_connection.cursor.return_value = mock_cursor
+    # Setup test data
+    await store.aput(("test", "foo"), "key1", {"data": "value1"})
+    await store.aput(("test", "bar"), "key2", {"data": "value2"})
 
     ops = [
         SearchOp(
@@ -233,29 +162,23 @@ async def test_batch_search_ops(store: AsyncPostgresStore) -> None:
     results = await store.abatch(ops)
 
     assert len(results) == 2
-    assert len(results[0]) == 2
-    assert len(results[1]) == 2
+    assert len(results[0]) == 1  # Filtered results
+    assert len(results[1]) == 2  # All results
 
 
 async def test_batch_list_namespaces_ops(store: AsyncPostgresStore) -> None:
-    mock_connection = store.conn
-    mock_cursor = MockAsyncCursor(
-        [
-            {"truncated_prefix": b"\x01test.namespace1"},
-            {"truncated_prefix": b"\x01test.namespace2"},
-        ]
-    )
-    mock_connection.cursor.return_value = mock_cursor
+    # Setup test data
+    await store.aput(("test", "namespace1"), "key1", {"data": "value1"})
+    await store.aput(("test", "namespace2"), "key2", {"data": "value2"})
 
     ops = [ListNamespacesOp(match_conditions=None, max_depth=None, limit=10, offset=0)]
 
     results = await store.abatch(ops)
 
     assert len(results) == 1
-    assert results[0] == [("test", "namespace1"), ("test", "namespace2")]
-
-
-# The following use the actual DB connection
+    assert len(results[0]) == 2
+    assert ("test", "namespace1") in results[0]
+    assert ("test", "namespace2") in results[0]
 
 
 class TestAsyncPostgresStore:

libs/checkpoint-postgres/tests/test_store.py

@@ -1,174 +1,118 @@
 # type: ignore
-import uuid
-from datetime import datetime
-from typing import Any
-from unittest.mock import MagicMock
+
+from uuid import uuid4
 
 import pytest
 from conftest import DEFAULT_URI  # type: ignore
+from psycopg import Connection
 
-from langgraph.store.base import GetOp, Item, ListNamespacesOp, PutOp, SearchOp
+from langgraph.store.base import (
+    GetOp,
+    Item,
+    ListNamespacesOp,
+    MatchCondition,
+    PutOp,
+    SearchOp,
+)
 from langgraph.store.postgres import PostgresStore
 
 
-class MockCursor:
-    def __init__(self, fetch_result: Any) -> None:
-        self.fetch_result = fetch_result
-        self.execute = MagicMock()
-        self.fetchall = MagicMock(return_value=self.fetch_result)
+@pytest.fixture(scope="function", params=["default", "pipe", "pool"])
+def store(request) -> PostgresStore:
+    database = f"test_{uuid4().hex[:16]}"
+    uri_parts = DEFAULT_URI.split("/")
+    uri_base = "/".join(uri_parts[:-1])
+    query_params = ""
+    if "?" in uri_parts[-1]:
+        db_name, query_params = uri_parts[-1].split("?", 1)
+        query_params = "?" + query_params
 
+    conn_string = f"{uri_base}/{database}{query_params}"
+    admin_conn_string = DEFAULT_URI
 
-class MockConnection:
-    def __init__(self) -> None:
-        self.cursor = MagicMock()
-        self.pipeline = MagicMock()
+    with Connection.connect(admin_conn_string, autocommit=True) as conn:
+        conn.execute(f"CREATE DATABASE {database}")
+    try:
+        with PostgresStore.from_conn_string(conn_string) as store:
+            store.setup()
 
-
-@pytest.fixture
-def mock_connection() -> MockConnection:
-    return MockConnection()
-
-
-@pytest.fixture
-def store(mock_connection: MockConnection) -> PostgresStore:
-    return PostgresStore(mock_connection)
+        if request.param == "pipe":
+            with PostgresStore.from_conn_string(conn_string, pipeline=True) as store:
+                yield store
+        elif request.param == "pool":
+            with PostgresStore.from_conn_string(
+                conn_string, pool_config={"min_size": 1, "max_size": 10}
+            ) as store:
+                yield store
+        else:  # default
+            with PostgresStore.from_conn_string(conn_string) as store:
+                yield store
+    finally:
+        with Connection.connect(admin_conn_string, autocommit=True) as conn:
+            conn.execute(f"DROP DATABASE {database}")
 
 
 def test_batch_order(store: PostgresStore) -> None:
-    mock_connection = store.conn
-    mock_get_cursor = MockCursor(
-        [
-            {
-                "key": "key1",
-                "value": '{"data": "value1"}',
-                "created_at": datetime.now(),
-                "updated_at": datetime.now(),
-                "prefix": "test.foo",
-            },
-            {
-                "key": "key2",
-                "value": '{"data": "value2"}',
-                "created_at": datetime.now(),
-                "updated_at": datetime.now(),
-                "prefix": "test.bar",
-            },
-        ]
-    )
-    mock_search_cursor = MockCursor(
-        [
-            {
-                "key": "key1",
-                "value": '{"data": "value1"}',
-                "created_at": datetime.now(),
-                "updated_at": datetime.now(),
-                "prefix": "test.foo",
-            },
-        ]
-    )
-    mock_list_namespaces_cursor = MockCursor(
-        [
-            {"truncated_prefix": b"\x01test"},
-        ]
-    )
-
-    failures = []
-
-    def cursor_side_effect(binary: bool = False) -> Any:
-        cursor = MagicMock()
-
-        def execute_side_effect(query: str, *params: Any) -> None:
-            # My super sophisticated database.
-            if "SELECT prefix, key, value" in query:
-                cursor.fetchall = mock_search_cursor.fetchall
-            elif "SELECT DISTINCT ON (truncated_prefix)" in query:
-                cursor.fetchall = mock_list_namespaces_cursor.fetchall
-            elif "WHERE prefix = %s AND key" in query:
-                cursor.fetchall = mock_get_cursor.fetchall
-            elif "INSERT INTO " in query:
-                pass
-            else:
-                e = ValueError(f"Unmatched query: {query}")
-                failures.append(e)
-                raise e
-
-        cursor.execute = MagicMock(side_effect=execute_side_effect)
-        return cursor
-
-    mock_connection.cursor.side_effect = cursor_side_effect
+    # Setup test data
+    store.put(("test", "foo"), "key1", {"data": "value1"})
+    store.put(("test", "bar"), "key2", {"data": "value2"})
 
     ops = [
-        GetOp(namespace=("test",), key="key1"),
-        PutOp(namespace=("test",), key="key2", value={"data": "value2"}),
+        GetOp(namespace=("test", "foo"), key="key1"),
+        PutOp(namespace=("test", "bar"), key="key2", value={"data": "value2"}),
         SearchOp(
             namespace_prefix=("test",), filter={"data": "value1"}, limit=10, offset=0
         ),
         ListNamespacesOp(match_conditions=None, max_depth=None, limit=10, offset=0),
         GetOp(namespace=("test",), key="key3"),
     ]
+
     results = store.batch(ops)
-    assert not failures
     assert len(results) == 5
     assert isinstance(results[0], Item)
     assert isinstance(results[0].value, dict)
     assert results[0].value == {"data": "value1"}
     assert results[0].key == "key1"
-    assert results[1] is None
+    assert results[1] is None  # Put operation returns None
     assert isinstance(results[2], list)
     assert len(results[2]) == 1
     assert isinstance(results[3], list)
-    assert results[3] == [("test",)]
-    assert results[4] is None
+    assert len(results[3]) > 0  # Should contain at least our test namespaces
+    assert results[4] is None  # Non-existent key returns None
 
+    # Test reordered operations
     ops_reordered = [
         SearchOp(namespace_prefix=("test",), filter=None, limit=5, offset=0),
-        GetOp(namespace=("test",), key="key2"),
+        GetOp(namespace=("test", "bar"), key="key2"),
         ListNamespacesOp(match_conditions=None, max_depth=None, limit=5, offset=0),
         PutOp(namespace=("test",), key="key3", value={"data": "value3"}),
-        GetOp(namespace=("test",), key="key1"),
+        GetOp(namespace=("test", "foo"), key="key1"),
     ]
 
     results_reordered = store.batch(ops_reordered)
-    assert not failures
     assert len(results_reordered) == 5
     assert isinstance(results_reordered[0], list)
-    assert len(results_reordered[0]) == 1
+    assert len(results_reordered[0]) >= 2  # Should find at least our two test items
     assert isinstance(results_reordered[1], Item)
     assert results_reordered[1].value == {"data": "value2"}
     assert results_reordered[1].key == "key2"
     assert isinstance(results_reordered[2], list)
-    assert results_reordered[2] == [("test",)]
-    assert results_reordered[3] is None
+    assert len(results_reordered[2]) > 0
+    assert results_reordered[3] is None  # Put operation returns None
     assert isinstance(results_reordered[4], Item)
     assert results_reordered[4].value == {"data": "value1"}
     assert results_reordered[4].key == "key1"
 
 
 def test_batch_get_ops(store: PostgresStore) -> None:
-    mock_connection = store.conn
-    mock_cursor = MockCursor(
-        [
-            {
-                "key": "key1",
-                "value": '{"data": "value1"}',
-                "created_at": datetime.now(),
-                "updated_at": datetime.now(),
-                "prefix": "test.foo",
-            },
-            {
-                "key": "key2",
-                "value": '{"data": "value2"}',
-                "created_at": datetime.now(),
-                "updated_at": datetime.now(),
-                "prefix": "test.bar",
-            },
-        ]
-    )
-    mock_connection.cursor.return_value = mock_cursor
+    # Setup test data
+    store.put(("test",), "key1", {"data": "value1"})
+    store.put(("test",), "key2", {"data": "value2"})
 
     ops = [
         GetOp(namespace=("test",), key="key1"),
         GetOp(namespace=("test",), key="key2"),
-        GetOp(namespace=("test",), key="key3"),
+        GetOp(namespace=("test",), key="key3"),  # Non-existent key
     ]
 
     results = store.batch(ops)
@@ -182,75 +126,90 @@ def test_batch_get_ops(store: PostgresStore) -> None:
 
 
 def test_batch_put_ops(store: PostgresStore) -> None:
-    mock_connection = store.conn
-    mock_cursor = MockCursor([])
-    mock_connection.cursor.return_value = mock_cursor
-
     ops = [
         PutOp(namespace=("test",), key="key1", value={"data": "value1"}),
         PutOp(namespace=("test",), key="key2", value={"data": "value2"}),
-        PutOp(namespace=("test",), key="key3", value=None),
+        PutOp(namespace=("test",), key="key3", value=None),  # Delete operation
     ]
 
     results = store.batch(ops)
-
     assert len(results) == 3
     assert all(result is None for result in results)
-    assert mock_cursor.execute.call_count == 2
+
+    # Verify the puts worked
+    item1 = store.get(("test",), "key1")
+    item2 = store.get(("test",), "key2")
+    item3 = store.get(("test",), "key3")
+
+    assert item1 and item1.value == {"data": "value1"}
+    assert item2 and item2.value == {"data": "value2"}
+    assert item3 is None
 
 
 def test_batch_search_ops(store: PostgresStore) -> None:
-    mock_connection = store.conn
-    mock_cursor = MockCursor(
-        [
-            {
-                "key": "key1",
-                "value": '{"data": "value1"}',
-                "created_at": datetime.now(),
-                "updated_at": datetime.now(),
-                "prefix": "test.foo",
-            },
-            {
-                "key": "key2",
-                "value": '{"data": "value2"}',
-                "created_at": datetime.now(),
-                "updated_at": datetime.now(),
-                "prefix": "test.bar",
-            },
-        ]
-    )
-    mock_connection.cursor.return_value = mock_cursor
+    # Setup test data
+    test_data = [
+        (("test", "foo"), "key1", {"data": "value1", "tag": "a"}),
+        (("test", "bar"), "key2", {"data": "value2", "tag": "a"}),
+        (("test", "baz"), "key3", {"data": "value3", "tag": "b"}),
+    ]
+    for namespace, key, value in test_data:
+        store.put(namespace, key, value)
 
     ops = [
-        SearchOp(
-            namespace_prefix=("test",), filter={"data": "value1"}, limit=10, offset=0
-        ),
-        SearchOp(namespace_prefix=("test",), filter=None, limit=5, offset=0),
+        SearchOp(namespace_prefix=("test",), filter={"tag": "a"}, limit=10, offset=0),
+        SearchOp(namespace_prefix=("test",), filter=None, limit=2, offset=0),
+        SearchOp(namespace_prefix=("test", "foo"), filter=None, limit=10, offset=0),
     ]
 
     results = store.batch(ops)
+    assert len(results) == 3
 
-    assert len(results) == 2
+    # First search should find items with tag "a"
     assert len(results[0]) == 2
+    assert all(item.value["tag"] == "a" for item in results[0])
+
+    # Second search should return first 2 items
     assert len(results[1]) == 2
 
+    # Third search should only find items in test/foo namespace
+    assert len(results[2]) == 1
+    assert results[2][0].namespace == ("test", "foo")
+
 
 def test_batch_list_namespaces_ops(store: PostgresStore) -> None:
-    mock_connection = store.conn
-    mock_cursor = MockCursor(
-        [
-            {"truncated_prefix": b"\x01test.namespace1"},
-            {"truncated_prefix": b"\x01test.namespace2"},
-        ]
-    )
-    mock_connection.cursor.return_value = mock_cursor
+    # Setup test data with various namespaces
+    test_data = [
+        (("test", "documents", "public"), "doc1", {"content": "public doc"}),
+        (("test", "documents", "private"), "doc2", {"content": "private doc"}),
+        (("test", "images", "public"), "img1", {"content": "public image"}),
+        (("prod", "documents", "public"), "doc3", {"content": "prod doc"}),
+    ]
+    for namespace, key, value in test_data:
+        store.put(namespace, key, value)
 
-    ops = [ListNamespacesOp(match_conditions=None, max_depth=None, limit=10, offset=0)]
+    ops = [
+        ListNamespacesOp(match_conditions=None, max_depth=None, limit=10, offset=0),
+        ListNamespacesOp(match_conditions=None, max_depth=2, limit=10, offset=0),
+        ListNamespacesOp(
+            match_conditions=[MatchCondition("suffix", "public")],
+            max_depth=None,
+            limit=10,
+            offset=0,
+        ),
+    ]
 
     results = store.batch(ops)
+    assert len(results) == 3
 
-    assert len(results) == 1
-    assert results[0] == [("test", "namespace1"), ("test", "namespace2")]
+    # First operation should list all namespaces
+    assert len(results[0]) == len(test_data)
+
+    # Second operation should only return namespaces up to depth 2
+    assert all(len(ns) <= 2 for ns in results[1])
+
+    # Third operation should only return namespaces ending with "public"
+    assert all(ns[-1] == "public" for ns in results[2])
 
 
 class TestPostgresStore:
@@ -273,195 +232,111 @@ class TestPostgresStore:
             assert item.key == item_id
             assert item.value == item_value
 
-            updated_value = {
-                "title": "Updated Test Document",
-                "content": "Hello, LangGraph!",
-            }
+            # Test update
+            updated_value = {"title": "Updated Document", "content": "Hello, Updated!"}
             store.put(namespace, item_id, updated_value)
             updated_item = store.get(namespace, item_id)
 
             assert updated_item.value == updated_value
             assert updated_item.updated_at > item.updated_at
+
+            # Test get from non-existent namespace
             different_namespace = ("test", "other_documents")
             item_in_different_namespace = store.get(different_namespace, item_id)
             assert item_in_different_namespace is None
 
-            new_item_id = "doc2"
-            new_item_value = {"title": "Another Document", "content": "Greetings!"}
-            store.put(namespace, new_item_id, new_item_value)
-
-            search_results = store.search(["test"], limit=10)
-            items = search_results
-            assert len(items) == 2
-            assert any(item.key == item_id for item in items)
-            assert any(item.key == new_item_id for item in items)
-
-            namespaces = store.list_namespaces(prefix=["test"])
-            assert ("test", "documents") in namespaces
-
+            # Test delete
             store.delete(namespace, item_id)
-            store.delete(namespace, new_item_id)
             deleted_item = store.get(namespace, item_id)
             assert deleted_item is None
 
-            deleted_item = store.get(namespace, new_item_id)
-            assert deleted_item is None
-
-            empty_search_results = store.search(["test"], limit=10)
-            assert len(empty_search_results) == 0
-
     def test_list_namespaces(self) -> None:
         with PostgresStore.from_conn_string(DEFAULT_URI) as store:
-            test_pref = str(uuid.uuid4())
+            # Create test data with various namespaces
             test_namespaces = [
-                (test_pref, "test", "documents", "public", test_pref),
-                (test_pref, "test", "documents", "private", test_pref),
-                (test_pref, "test", "images", "public", test_pref),
-                (test_pref, "test", "images", "private", test_pref),
-                (test_pref, "prod", "documents", "public", test_pref),
-                (
-                    test_pref,
-                    "prod",
-                    "documents",
-                    "some",
-                    "nesting",
-                    "public",
-                    test_pref,
-                ),
-                (test_pref, "prod", "documents", "private", test_pref),
+                ("test", "documents", "public"),
+                ("test", "documents", "private"),
+                ("test", "images", "public"),
+                ("test", "images", "private"),
+                ("prod", "documents", "public"),
+                ("prod", "documents", "private"),
             ]
 
+            # Insert test data
             for namespace in test_namespaces:
                 store.put(namespace, "dummy", {"content": "dummy"})
 
-            prefix_result = store.list_namespaces(prefix=[test_pref, "test"])
-            assert len(prefix_result) == 4
-            assert all([ns[1] == "test" for ns in prefix_result])
+            # Test listing with various filters
+            all_namespaces = store.list_namespaces()
+            assert len(all_namespaces) == len(test_namespaces)
 
-            specific_prefix_result = store.list_namespaces(
-                prefix=[test_pref, "test", "documents"]
-            )
-            assert len(specific_prefix_result) == 2
-            assert all(
-                [ns[1:3] == ("test", "documents") for ns in specific_prefix_result]
-            )
+            # Test prefix filtering
+            test_prefix_namespaces = store.list_namespaces(prefix=["test"])
+            assert len(test_prefix_namespaces) == 4
+            assert all(ns[0] == "test" for ns in test_prefix_namespaces)
 
-            suffix_result = store.list_namespaces(suffix=["public", test_pref])
-            assert len(suffix_result) == 4
-            assert all(ns[-2] == "public" for ns in suffix_result)
+            # Test suffix filtering
+            public_namespaces = store.list_namespaces(suffix=["public"])
+            assert len(public_namespaces) == 3
+            assert all(ns[-1] == "public" for ns in public_namespaces)
 
-            prefix_suffix_result = store.list_namespaces(
-                prefix=[test_pref, "test"], suffix=["public", test_pref]
-            )
-            assert len(prefix_suffix_result) == 2
-            assert all(
-                ns[1] == "test" and ns[-2] == "public" for ns in prefix_suffix_result
-            )
+            # Test max depth
+            depth_2_namespaces = store.list_namespaces(max_depth=2)
+            assert all(len(ns) <= 2 for ns in depth_2_namespaces)
 
-            wildcard_prefix_result = store.list_namespaces(
-                prefix=[test_pref, "*", "documents"]
-            )
-            assert len(wildcard_prefix_result) == 5
-            assert all(ns[2] == "documents" for ns in wildcard_prefix_result)
-
-            wildcard_suffix_result = store.list_namespaces(
-                suffix=["*", "public", test_pref]
-            )
-            assert len(wildcard_suffix_result) == 4
-            assert all(ns[-2] == "public" for ns in wildcard_suffix_result)
-            wildcard_single = store.list_namespaces(
-                suffix=["some", "*", "public", test_pref]
-            )
-            assert len(wildcard_single) == 1
-            assert wildcard_single[0] == (
-                test_pref,
-                "prod",
-                "documents",
-                "some",
-                "nesting",
-                "public",
-                test_pref,
-            )
-
-            max_depth_result = store.list_namespaces(max_depth=3)
-            assert all([len(ns) <= 3 for ns in max_depth_result])
-
-            max_depth_result = store.list_namespaces(
-                max_depth=4, prefix=[test_pref, "*", "documents"]
-            )
-            assert (
-                len(set(tuple(res) for res in max_depth_result))
-                == len(max_depth_result)
-                == 5
-            )
-
-            limit_result = store.list_namespaces(prefix=[test_pref], limit=3)
-            assert len(limit_result) == 3
-
-            offset_result = store.list_namespaces(prefix=[test_pref], offset=3)
-            assert len(offset_result) == len(test_namespaces) - 3
-
-            empty_prefix_result = store.list_namespaces(prefix=[test_pref])
-            assert len(empty_prefix_result) == len(test_namespaces)
-            assert set(tuple(ns) for ns in empty_prefix_result) == set(
-                tuple(ns) for ns in test_namespaces
-            )
+            # Test pagination
+            paginated_namespaces = store.list_namespaces(limit=3)
+            assert len(paginated_namespaces) == 3
 
+            # Cleanup
             for namespace in test_namespaces:
                 store.delete(namespace, "dummy")
 
-    def test_search(self):
+    def test_search(self) -> None:
         with PostgresStore.from_conn_string(DEFAULT_URI) as store:
-            test_namespaces = [
-                ("test_search", "documents", "user1"),
-                ("test_search", "documents", "user2"),
-                ("test_search", "reports", "department1"),
-                ("test_search", "reports", "department2"),
-            ]
-            test_items = [
-                {"title": "Doc 1", "author": "John Doe", "tags": ["important"]},
-                {"title": "Doc 2", "author": "Jane Smith", "tags": ["draft"]},
-                {"title": "Report A", "author": "John Doe", "tags": ["final"]},
-                {"title": "Report B", "author": "Alice Johnson", "tags": ["draft"]},
+            # Create test data
+            test_data = [
+                (
+                    ("test", "docs"),
+                    "doc1",
+                    {"title": "First Doc", "author": "Alice", "tags": ["important"]},
+                ),
+                (
+                    ("test", "docs"),
+                    "doc2",
+                    {"title": "Second Doc", "author": "Bob", "tags": ["draft"]},
+                ),
+                (
+                    ("test", "images"),
+                    "img1",
+                    {"title": "Image 1", "author": "Alice", "tags": ["final"]},
+                ),
             ]
 
-            for namespace, item in zip(test_namespaces, test_items):
-                store.put(namespace, f"item_{namespace[-1]}", item)
+            for namespace, key, value in test_data:
+                store.put(namespace, key, value)
 
-            docs_result = store.search(["test_search", "documents"])
-            assert len(docs_result) == 2
-            assert all(
-                [item.namespace[1] == "documents" for item in docs_result]
-            ), docs_result
+            # Test basic search
+            all_items = store.search(["test"])
+            assert len(all_items) == 3
 
-            reports_result = store.search(["test_search", "reports"])
-            assert len(reports_result) == 2
-            assert all(item.namespace[1] == "reports" for item in reports_result)
+            # Test namespace filtering
+            docs_items = store.search(["test", "docs"])
+            assert len(docs_items) == 2
+            assert all(item.namespace == ("test", "docs") for item in docs_items)
 
-            limited_result = store.search(["test_search"], limit=2)
-            assert len(limited_result) == 2
-            offset_result = store.search(["test_search"])
-            assert len(offset_result) == 4
+            # Test value filtering
+            alice_items = store.search(["test"], filter={"author": "Alice"})
+            assert len(alice_items) == 2
+            assert all(item.value["author"] == "Alice" for item in alice_items)
 
-            offset_result = store.search(["test_search"], offset=2)
-            assert len(offset_result) == 2
-            assert all(item not in limited_result for item in offset_result)
+            # Test pagination
+            paginated_items = store.search(["test"], limit=2)
+            assert len(paginated_items) == 2
 
-            john_doe_result = store.search(
-                ["test_search"], filter={"author": "John Doe"}
-            )
-            assert len(john_doe_result) == 2
-            assert all(item.value["author"] == "John Doe" for item in john_doe_result)
+            offset_items = store.search(["test"], offset=2)
+            assert len(offset_items) == 1
 
-            draft_result = store.search(["test_search"], filter={"tags": ["draft"]})
-            assert len(draft_result) == 2
-            assert all("draft" in item.value["tags"] for item in draft_result)
-
-            page1 = store.search(["test_search"], limit=2, offset=0)
-            page2 = store.search(["test_search"], limit=2, offset=2)
-            all_items = page1 + page2
-            assert len(all_items) == 4
-            assert len(set(item.key for item in all_items)) == 4
-
-            for namespace in test_namespaces:
-                store.delete(namespace, f"item_{namespace[-1]}")
+            # Cleanup
+            for namespace, key, _ in test_data:
+                store.delete(namespace, key)

libs/checkpoint/langgraph/store/base/batch.py

@@ -6,6 +6,9 @@ from langgraph.store.base import (
     BaseStore,
     GetOp,
     Item,
+    ListNamespacesOp,
+    MatchCondition,
+    NameSpacePath,
     Op,
     PutOp,
     SearchOp,
@@ -68,6 +71,74 @@ class AsyncBatchedBaseStore(BaseStore):
         self._aqueue[fut] = PutOp(namespace, key, None)
         return await fut
 
+    async def alist_namespaces(
+        self,
+        *,
+        prefix: Optional[NameSpacePath] = None,
+        suffix: Optional[NameSpacePath] = None,
+        max_depth: Optional[int] = None,
+        limit: int = 100,
+        offset: int = 0,
+    ) -> list[tuple[str, ...]]:
+        fut = self._loop.create_future()
+        match_conditions = []
+        if prefix:
+            match_conditions.append(MatchCondition(match_type="prefix", path=prefix))
+        if suffix:
+            match_conditions.append(MatchCondition(match_type="suffix", path=suffix))
+
+        op = ListNamespacesOp(
+            match_conditions=tuple(match_conditions),
+            max_depth=max_depth,
+            limit=limit,
+            offset=offset,
+        )
+        self._aqueue[fut] = op
+        return await fut
+
+
+def _dedupe_ops(values: list[Op]) -> tuple[Optional[list[int]], list[Op]]:
+    """Dedupe operations while preserving order for results.
+
+    Args:
+        values: List of operations to dedupe
+
+    Returns:
+        Tuple of (listen indices, deduped operations)
+        where listen indices map deduped operation results back to original positions
+    """
+    if len(values) <= 1:
+        return None, list(values)
+
+    dedupped: list[Op] = []
+    listen: list[int] = []
+    puts: dict[tuple[tuple[str, ...], str], int] = {}
+
+    for op in values:
+        if isinstance(op, (GetOp, SearchOp, ListNamespacesOp)):
+            try:
+                listen.append(dedupped.index(op))
+            except ValueError:
+                listen.append(len(dedupped))
+                dedupped.append(op)
+        elif isinstance(op, PutOp):
+            putkey = (op.namespace, op.key)
+            if putkey in puts:
+                # Overwrite previous put
+                ix = puts[putkey]
+                dedupped[ix] = op
+                listen.append(ix)
+            else:
+                puts[putkey] = len(dedupped)
+                listen.append(len(dedupped))
+                dedupped.append(op)
+
+        else:  # Any new ops will be treated regularly
+            listen.append(len(dedupped))
+            dedupped.append(op)
+
+    return listen, dedupped
+
 
 async def _run(
     aqueue: dict[asyncio.Future, Op], store: weakref.ReferenceType[BaseStore]
@@ -81,7 +152,12 @@ async def _run(
             taken = aqueue.copy()
             # action each operation
             try:
-                results = await s.abatch(taken.values())
+                values = list(taken.values())
+                listen, dedupped = _dedupe_ops(values)
+                results = await s.abatch(dedupped)
+                if listen is not None:
+                    results = [results[ix] for ix in listen]
+
                 # set the results of each operation
                 for fut, result in zip(taken, results):
                     fut.set_result(result)

libs/checkpoint/pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langgraph-checkpoint"
-version = "2.0.5"
+version = "2.0.6"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 authors = []
 license = "MIT"

libs/checkpoint/tests/test_store.py

@@ -10,6 +10,18 @@ from langgraph.store.base.batch import AsyncBatchedBaseStore
 from langgraph.store.memory import InMemoryStore
 
 
+class MockAsyncBatchedStore(AsyncBatchedBaseStore):
+    def __init__(self) -> None:
+        super().__init__()
+        self._store = InMemoryStore()
+
+    def batch(self, ops: Iterable[Op]) -> list[Result]:
+        return self._store.batch(ops)
+
+    async def abatch(self, ops: Iterable[Op]) -> list[Result]:
+        return self._store.batch(ops)
+
+
 async def test_async_batch_store(mocker: MockerFixture) -> None:
     abatch = mocker.stub()
 
@@ -313,17 +325,6 @@ async def test_cannot_put_empty_namespace() -> None:
     store.delete(("langgraph", "foo"), "bar")
     assert store.get(("langgraph", "foo"), "bar") is None
 
-    class MockAsyncBatchedStore(AsyncBatchedBaseStore):
-        def __init__(self) -> None:
-            super().__init__()
-            self._store = InMemoryStore()
-
-        def batch(self, ops: Iterable[Op]) -> list[Result]:
-            return self._store.batch(ops)
-
-        async def abatch(self, ops: Iterable[Op]) -> list[Result]:
-            return self._store.batch(ops)
-
     async_store = MockAsyncBatchedStore()
     doc = {"foo": "bar"}
 
@@ -354,3 +355,68 @@ async def test_cannot_put_empty_namespace() -> None:
     assert (await async_store.asearch(("valid", "namespace")))[0].value == doc
     await async_store.adelete(("valid", "namespace"), "key")
     assert (await async_store.aget(("valid", "namespace"), "key")) is None
+
+
+async def test_async_batch_store_deduplication(mocker: MockerFixture) -> None:
+    abatch = mocker.spy(InMemoryStore, "batch")
+    store = MockAsyncBatchedStore()
+
+    same_doc = {"value": "same"}
+    diff_doc = {"value": "different"}
+    await asyncio.gather(
+        store.aput(namespace=("test",), key="same", value=same_doc),
+        store.aput(namespace=("test",), key="different", value=diff_doc),
+    )
+    abatch.reset_mock()
+
+    results = await asyncio.gather(
+        store.aget(namespace=("test",), key="same"),
+        store.aget(namespace=("test",), key="same"),
+        store.aget(namespace=("test",), key="different"),
+    )
+
+    assert len(results) == 3
+    assert results[0] == results[1]
+    assert results[0] != results[2]
+    assert results[0].value == same_doc  # type: ignore
+    assert results[2].value == diff_doc  # type: ignore
+    assert len(abatch.call_args_list) == 1
+    ops = list(abatch.call_args_list[0].args[1])
+    assert len(ops) == 2
+    assert GetOp(("test",), "same") in ops
+    assert GetOp(("test",), "different") in ops
+
+    abatch.reset_mock()
+
+    doc1 = {"value": 1}
+    doc2 = {"value": 2}
+    results = await asyncio.gather(
+        store.aput(namespace=("test",), key="key", value=doc1),
+        store.aput(namespace=("test",), key="key", value=doc2),
+    )
+    assert len(abatch.call_args_list) == 1
+    ops = list(abatch.call_args_list[0].args[1])
+    assert len(ops) == 1
+    assert ops[0] == PutOp(("test",), "key", doc2)
+    assert len(results) == 2
+    assert all(result is None for result in results)
+
+    result = await store.aget(namespace=("test",), key="key")
+    assert result is not None
+    assert result.value == doc2
+
+    abatch.reset_mock()
+
+    results = await asyncio.gather(
+        store.asearch(("test",), filter={"value": 2}),
+        store.asearch(("test",), filter={"value": 2}),
+    )
+    assert len(abatch.call_args_list) == 1
+    ops = list(abatch.call_args_list[0].args[1])
+    assert len(ops) == 1
+    assert len(results) == 2
+    assert results[0] == results[1]
+    assert len(results[0]) == 1
+    assert results[0][0].value == doc2
+
+    abatch.reset_mock()

libs/cli/langgraph_cli/cli.py

@@ -1,3 +1,4 @@
+import os
 import pathlib
 import shutil
 import sys
@@ -598,6 +599,13 @@ def dev(
         ) from None
 
     config_json = langgraph_cli.config.validate_config_file(config)
+    cwd = os.getcwd()
+    sys.path.append(cwd)
+    dependencies = config_json.get("dependencies", [])
+    for dep in dependencies:
+        dep_path = pathlib.Path(cwd) / dep
+        if dep_path.is_dir() and dep_path.exists():
+            sys.path.append(str(dep_path))
 
     graphs = config_json.get("graphs", {})
     run_server(

libs/cli/poetry.lock

@@ -526,13 +526,13 @@ tests = ["flask (>=2.2.5)", "hypothesis (>=6.79.4)", "pytest (>=7.4.4)"]
 
 [[package]]
 name = "langchain-core"
-version = "0.3.19"
+version = "0.3.21"
 description = "Building applications with LLMs through composability"
 optional = true
 python-versions = "<4.0,>=3.9"
 files = [
-    {file = "langchain_core-0.3.19-py3-none-any.whl", hash = "sha256:562b7cc3c15dfaa9270cb1496990c1f3b3e0b660c4d6a3236d7f693346f2a96c"},
-    {file = "langchain_core-0.3.19.tar.gz", hash = "sha256:126d9e8cadb2a5b8d1793a228c0783a3b608e36064d5a2ef1a4d38d07a344523"},
+    {file = "langchain_core-0.3.21-py3-none-any.whl", hash = "sha256:7e723dff80946a1198976c6876fea8326dc82566ef9bcb5f8d9188f738733665"},
+    {file = "langchain_core-0.3.21.tar.gz", hash = "sha256:561b52b258ffa50a9fb11d7a1940ebfd915654d1ec95b35e81dfd5ee84143411"},
 ]
 
 [package.dependencies]
@@ -593,13 +593,13 @@ watchfiles = ">=0.13"
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "2.0.5"
+version = "2.0.6"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 optional = true
 python-versions = "<4.0.0,>=3.9.0"
 files = [
-    {file = "langgraph_checkpoint-2.0.5-py3-none-any.whl", hash = "sha256:0e7e730ea9358577bdcdeb6a17d8f340bad59770e2895a8a7fc853a76e08400b"},
-    {file = "langgraph_checkpoint-2.0.5.tar.gz", hash = "sha256:48612cdaf98c40a998079d222abb196a61e504d04dea65c7820d738d42150cac"},
+    {file = "langgraph_checkpoint-2.0.6-py3-none-any.whl", hash = "sha256:2878283c3ee2519bf180df9b7b7155b73fa05eb63b1af9600a03e03a930d8c53"},
+    {file = "langgraph_checkpoint-2.0.6.tar.gz", hash = "sha256:69ab9c61c4e2992264671f55579c24070b7b6cedc105a33da3fba6526df248cf"},
 ]
 
 [package.dependencies]
@@ -624,13 +624,13 @@ orjson = ">=3.10.1"
 
 [[package]]
 name = "langsmith"
-version = "0.1.144"
+version = "0.1.146"
 description = "Client library to connect to the LangSmith LLM Tracing and Evaluation Platform."
 optional = true
 python-versions = "<4.0,>=3.8.1"
 files = [
-    {file = "langsmith-0.1.144-py3-none-any.whl", hash = "sha256:08ffb975bff2e82fc6f5428837c64c074ea25102d08a25e256361a80812c6100"},
-    {file = "langsmith-0.1.144.tar.gz", hash = "sha256:b621f358d5a33441d7b5e7264c376bf4ea82bfc62d7e41aafc0f8094e3bd6369"},
+    {file = "langsmith-0.1.146-py3-none-any.whl", hash = "sha256:9d062222f1a32c9b047dab0149b24958f988989cd8d4a5f9139ff959a51e59d8"},
+    {file = "langsmith-0.1.146.tar.gz", hash = "sha256:ead8b0b9d5b6cd3ac42937ec48bdf09d4afe7ca1bba22dc05eb65591a18106f8"},
 ]
 
 [package.dependencies]
@@ -782,69 +782,86 @@ files = [
 
 [[package]]
 name = "orjson"
-version = "3.10.11"
+version = "3.10.12"
 description = "Fast, correct Python JSON library supporting dataclasses, datetimes, and numpy"
 optional = true
 python-versions = ">=3.8"
 files = [
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 [package.dependencies]
@@ -1106,6 +1123,20 @@ docopt = ">=0.4.0"
 pytest = ">=2.6.4"
 watchdog = ">=0.6.0"
 
+[[package]]
+name = "python-dotenv"
+version = "1.0.1"
+description = "Read key-value pairs from a .env file and set them as environment variables"
+optional = true
+python-versions = ">=3.8"
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+]
+
+[package.extras]
+cli = ["click (>=5.0)"]
+
 [[package]]
 name = "pyyaml"
 version = "6.0.2"
@@ -1410,103 +1441,91 @@ watchmedo = ["PyYAML (>=3.10)"]
 
 [[package]]
 name = "watchfiles"
-version = "0.24.0"
+version = "1.0.0"
 description = "Simple, modern and high performance file watching and code reload in python."
 optional = true
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 ]
 
 [package.dependencies]
 anyio = ">=3.0.0"
 
 [extras]
-inmem = ["langgraph-api"]
+inmem = ["langgraph-api", "python-dotenv"]
 
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9.0,<4.0"
-content-hash = "624dc1a2a5c8a20ef781ed370e106f29da98e7c7235c797ff6a933a3ad20b500"
+content-hash = "3d655bb578e20219e19152d4a3d86be370fe3be61b5559847f0204dfff499b4a"

libs/cli/pyproject.toml

@@ -1,12 +1,12 @@
 [tool.poetry]
 name = "langgraph-cli"
-version = "0.1.58"
+version = "0.1.59"
 description = "CLI for interacting with LangGraph API"
 authors = []
 license = "MIT"
 readme = "README.md"
 repository = "https://www.github.com/langchain-ai/langgraph"
-packages = [{include = "langgraph_cli"}]
+packages = [{ include = "langgraph_cli" }]
 
 [tool.poetry.scripts]
 langgraph = "langgraph_cli.cli:cli"
@@ -14,7 +14,8 @@ langgraph = "langgraph_cli.cli:cli"
 [tool.poetry.dependencies]
 python = "^3.9.0,<4.0"
 click = "^8.1.7"
-langgraph-api = { version = ">=0.0.2,<0.1.0", optional = true , python=">=3.11,<4.0" }
+langgraph-api = { version = ">=0.0.2,<0.1.0", optional = true, python = ">=3.11,<4.0" }
+python-dotenv = { version = ">=0.8.0", optional = true }
 
 [tool.poetry.group.dev.dependencies]
 ruff = "^0.6.2"
@@ -26,7 +27,7 @@ pytest-watch = "^4.2.0"
 mypy = "^1.10.0"
 
 [tool.poetry.extras]
-inmem = ["langgraph-api"]
+inmem = ["langgraph-api", "python-dotenv"]
 
 [tool.pytest.ini_options]
 # --strict-markers will raise errors on unknown marks.
@@ -56,4 +57,4 @@ lint.select = [
   # isort
   "I",
 ]
-lint.ignore = [ "E501", "B008" ]
+lint.ignore = ["E501", "B008"]

libs/langgraph/Makefile

@@ -48,8 +48,13 @@ test:
 	make stop-postgres; \
 	exit $$EXIT_CODE
 
+WORKERS ?= auto
+XDIST_ARGS := $(if $(WORKERS),-n $(WORKERS) --dist worksteal,)
+MAXFAIL ?=
+MAXFAIL_ARGS := $(if $(MAXFAIL),--maxfail $(MAXFAIL),)
+
 test_watch:
-	make start-postgres && poetry run ptw . -- --ff -vv -x -n auto --dist worksteal --snapshot-update --tb short $(TEST); \
+	make start-postgres && poetry run ptw . -- --ff -vv -x $(XDIST_ARGS) $(MAXFAIL_ARGS) --snapshot-update --tb short $(TEST); \
 	EXIT_CODE=$$?; \
 	make stop-postgres; \
 	exit $$EXIT_CODE

libs/langgraph/langgraph/errors.py

@@ -2,7 +2,7 @@ from enum import Enum
 from typing import Any, Sequence
 
 from langgraph.checkpoint.base import EmptyChannelError  # noqa: F401
-from langgraph.types import Interrupt
+from langgraph.types import Command, Interrupt
 
 # EmptyChannelError re-exported for backwards compatibility
 
@@ -58,7 +58,11 @@ class InvalidUpdateError(Exception):
     pass
 
 
-class GraphInterrupt(Exception):
+class GraphBubbleUp(Exception):
+    pass
+
+
+class GraphInterrupt(GraphBubbleUp):
     """Raised when a subgraph is interrupted, suppressed by the root graph.
     Never raised directly, or surfaced to the user."""
 
@@ -73,13 +77,20 @@ class NodeInterrupt(GraphInterrupt):
         super().__init__([Interrupt(value=value)])
 
 
-class GraphDelegate(Exception):
+class GraphDelegate(GraphBubbleUp):
     """Raised when a graph is delegated (for distributed mode)."""
 
     def __init__(self, *args: dict[str, Any]) -> None:
         super().__init__(*args)
 
 
+class ParentCommand(GraphBubbleUp):
+    args: tuple[Command]
+
+    def __init__(self, command: Command) -> None:
+        super().__init__(command)
+
+
 class EmptyInputError(Exception):
     """Raised when graph receives an empty input."""
 

libs/langgraph/langgraph/graph/state.py

@@ -37,7 +37,12 @@ from langgraph.channels.ephemeral_value import EphemeralValue
 from langgraph.channels.last_value import LastValue
 from langgraph.channels.named_barrier_value import NamedBarrierValue
 from langgraph.constants import EMPTY_SEQ, NS_END, NS_SEP, SELF, TAG_HIDDEN
-from langgraph.errors import ErrorCode, InvalidUpdateError, create_error_message
+from langgraph.errors import (
+    ErrorCode,
+    InvalidUpdateError,
+    ParentCommand,
+    create_error_message,
+)
 from langgraph.graph.graph import END, START, Branch, CompiledGraph, Graph, Send
 from langgraph.managed.base import (
     ChannelKeyPlaceholder,
@@ -623,6 +628,8 @@ class CompiledStateGraph(CompiledGraph):
 
         def _get_root(input: Any) -> Any:
             if isinstance(input, Command):
+                if input.graph == Command.PARENT:
+                    return SKIP_WRITE
                 return input.update
             else:
                 return input
@@ -640,6 +647,8 @@ class CompiledStateGraph(CompiledGraph):
                     )
                 return input.get(key, SKIP_WRITE)
             elif isinstance(input, Command):
+                if input.graph == Command.PARENT:
+                    return SKIP_WRITE
                 return _get_state_key(input.update, key=key)
             elif get_type_hints(type(input)):
                 value = getattr(input, key, SKIP_WRITE)
@@ -822,6 +831,8 @@ def _control_branch(value: Any) -> Sequence[Union[str, Send]]:
         return [value]
     if not isinstance(value, GraphCommand):
         return EMPTY_SEQ
+    if value.graph == Command.PARENT:
+        raise ParentCommand(value)
     rtn: list[Union[str, Send]] = []
     if isinstance(value.goto, str):
         rtn.append(value.goto)
@@ -839,6 +850,8 @@ async def _acontrol_branch(value: Any) -> Sequence[Union[str, Send]]:
         return [value]
     if not isinstance(value, GraphCommand):
         return EMPTY_SEQ
+    if value.graph == Command.PARENT:
+        raise ParentCommand(value)
     rtn: list[Union[str, Send]] = []
     if isinstance(value.goto, str):
         rtn.append(value.goto)

libs/langgraph/langgraph/prebuilt/tool_node.py

@@ -37,7 +37,7 @@ from langchain_core.tools import tool as create_tool
 from langchain_core.tools.base import get_all_basemodel_annotations
 from typing_extensions import Annotated, get_args, get_origin
 
-from langgraph.errors import GraphInterrupt
+from langgraph.errors import GraphBubbleUp
 from langgraph.store.base import BaseStore
 from langgraph.utils.runnable import RunnableCallable
 
@@ -275,7 +275,7 @@ class ToolNode(RunnableCallable):
         # (2) a NodeInterrupt is raised inside a graph node for a graph called as a tool
         # (3) a GraphInterrupt is raised when a subgraph is interrupted inside a graph called as a tool
         # (2 and 3 can happen in a "supervisor w/ tools" multi-agent architecture)
-        except GraphInterrupt as e:
+        except GraphBubbleUp as e:
             raise e
         except Exception as e:
             if isinstance(self.handle_tool_errors, tuple):
@@ -316,7 +316,7 @@ class ToolNode(RunnableCallable):
         # (2) a NodeInterrupt is raised inside a graph node for a graph called as a tool
         # (3) a GraphInterrupt is raised when a subgraph is interrupted inside a graph called as a tool
         # (2 and 3 can happen in a "supervisor w/ tools" multi-agent architecture)
-        except GraphInterrupt as e:
+        except GraphBubbleUp as e:
             raise e
         except Exception as e:
             if isinstance(self.handle_tool_errors, tuple):

libs/langgraph/langgraph/pregel/algo.py

@@ -602,6 +602,7 @@ def prepare_single_task(
                     None,
                     task_id,
                     task_path,
+                    writers=proc.flat_writers,
                 )
 
         else:
@@ -720,6 +721,7 @@ def prepare_single_task(
                         None,
                         task_id,
                         task_path,
+                        writers=proc.flat_writers,
                     )
             else:
                 return PregelTask(task_id, name, task_path)

libs/langgraph/langgraph/pregel/executor.py

@@ -20,7 +20,7 @@ from langchain_core.runnables import RunnableConfig
 from langchain_core.runnables.config import get_executor_for_config
 from typing_extensions import ParamSpec
 
-from langgraph.errors import GraphInterrupt
+from langgraph.errors import GraphBubbleUp
 
 P = ParamSpec("P")
 T = TypeVar("T")
@@ -68,7 +68,7 @@ class BackgroundExecutor(ContextManager):
     def done(self, task: concurrent.futures.Future) -> None:
         try:
             task.result()
-        except GraphInterrupt:
+        except GraphBubbleUp:
             # This exception is an interruption signal, not an error
             # so we don't want to re-raise it on exit
             self.tasks.pop(task)
@@ -155,7 +155,7 @@ class AsyncBackgroundExecutor(AsyncContextManager):
             if exc := task.exception():
                 # This exception is an interruption signal, not an error
                 # so we don't want to re-raise it on exit
-                if isinstance(exc, GraphInterrupt):
+                if isinstance(exc, GraphBubbleUp):
                     self.tasks.pop(task)
             else:
                 self.tasks.pop(task)

libs/langgraph/langgraph/pregel/io.py

@@ -15,6 +15,7 @@ from langgraph.constants import (
     TAG_HIDDEN,
     TASKS,
 )
+from langgraph.errors import InvalidUpdateError
 from langgraph.pregel.log import logger
 from langgraph.types import Command, PregelExecutableTask, Send
 
@@ -68,6 +69,8 @@ def map_command(
     cmd: Command,
 ) -> Iterator[tuple[str, str, Any]]:
     """Map input chunk to a sequence of pending writes in the form (channel, value)."""
+    if cmd.graph == Command.PARENT:
+        raise InvalidUpdateError("There is not parent graph")
     if cmd.send:
         if isinstance(cmd.send, (tuple, list)):
             sends = cmd.send

libs/langgraph/langgraph/pregel/retry.py

@@ -2,6 +2,7 @@ import asyncio
 import logging
 import random
 import time
+from dataclasses import replace
 from functools import partial
 from typing import Any, Callable, Optional, Sequence
 
@@ -10,9 +11,10 @@ from langgraph.constants import (
     CONFIG_KEY_CHECKPOINT_NS,
     CONFIG_KEY_RESUMING,
     CONFIG_KEY_SEND,
+    NS_SEP,
 )
-from langgraph.errors import _SEEN_CHECKPOINT_NS, GraphInterrupt
-from langgraph.types import PregelExecutableTask, RetryPolicy
+from langgraph.errors import _SEEN_CHECKPOINT_NS, GraphBubbleUp, ParentCommand
+from langgraph.types import Command, PregelExecutableTask, RetryPolicy
 from langgraph.utils.config import patch_configurable
 
 logger = logging.getLogger(__name__)
@@ -40,7 +42,21 @@ def run_with_retry(
             task.proc.invoke(task.input, config)
             # if successful, end
             break
-        except GraphInterrupt:
+        except ParentCommand as exc:
+            ns: str = config[CONF][CONFIG_KEY_CHECKPOINT_NS]
+            cmd = exc.args[0]
+            if cmd.graph == ns:
+                # this command is for the current graph, handle it
+                for w in task.writers:
+                    w.invoke(cmd, config)
+                break
+            elif cmd.graph == Command.PARENT:
+                # this command is for the parent graph, assign it to the parent
+                parent_ns = NS_SEP.join(ns.split(NS_SEP)[:-1])
+                exc.args = (replace(cmd, graph=parent_ns),)
+            # bubble up
+            raise
+        except GraphBubbleUp:
             # if interrupted, end
             raise
         except Exception as exc:
@@ -118,7 +134,21 @@ async def arun_with_retry(
                 await task.proc.ainvoke(task.input, config)
             # if successful, end
             break
-        except GraphInterrupt:
+        except ParentCommand as exc:
+            ns: str = config[CONF][CONFIG_KEY_CHECKPOINT_NS]
+            cmd = exc.args[0]
+            if cmd.graph == ns:
+                # this command is for the current graph, handle it
+                for w in task.writers:
+                    w.invoke(cmd, config)
+                break
+            elif cmd.graph == Command.PARENT:
+                # this command is for the parent graph, assign it to the parent
+                parent_ns = NS_SEP.join(ns.split(NS_SEP)[:-1])
+                exc.args = (replace(cmd, graph=parent_ns),)
+            # bubble up
+            raise
+        except GraphBubbleUp:
             # if interrupted, end
             raise
         except Exception as exc:

libs/langgraph/langgraph/pregel/runner.py

@@ -23,7 +23,7 @@ from langgraph.constants import (
     PUSH,
     TAG_HIDDEN,
 )
-from langgraph.errors import GraphDelegate, GraphInterrupt
+from langgraph.errors import GraphBubbleUp, GraphInterrupt
 from langgraph.pregel.executor import Submit
 from langgraph.pregel.retry import arun_with_retry, run_with_retry
 from langgraph.types import PregelExecutableTask, RetryPolicy
@@ -298,7 +298,7 @@ class PregelRunner:
                 # save interrupt to checkpointer
                 if interrupts := [(INTERRUPT, i) for i in exception.args[0]]:
                     self.put_writes(task.id, interrupts)
-            elif isinstance(exception, GraphDelegate):
+            elif isinstance(exception, GraphBubbleUp):
                 raise exception
             else:
                 # save error to checkpointer
@@ -324,7 +324,7 @@ def _should_stop_others(
         if fut.cancelled():
             return True
         if exc := fut.exception():
-            return not isinstance(exc, GraphInterrupt)
+            return not isinstance(exc, GraphBubbleUp)
     else:
         return False
 

libs/langgraph/langgraph/types.py

@@ -5,6 +5,7 @@ from typing import (
     TYPE_CHECKING,
     Any,
     Callable,
+    ClassVar,
     Generic,
     Hashable,
     Literal,
@@ -140,6 +141,7 @@ class PregelExecutableTask(NamedTuple):
     id: str
     path: tuple[Union[str, int, tuple], ...]
     scheduled: bool = False
+    writers: Sequence[Runnable] = ()
 
 
 class StateSnapshot(NamedTuple):
@@ -239,6 +241,7 @@ N = TypeVar("N", bound=Hashable)
 class Command(Generic[N]):
     """One or more commands to update the graph's state and send messages to nodes."""
 
+    graph: Optional[str] = None
     update: Optional[dict[str, Any]] = None
     send: Union[Send, Sequence[Send]] = ()
     resume: Optional[Union[Any, dict[str, Any]]] = None
@@ -252,6 +255,8 @@ class Command(Generic[N]):
         )
         return f"Command({contents})"
 
+    PARENT: ClassVar[Literal["__parent__"]] = "__parent__"
+
 
 StreamChunk = tuple[tuple[str, ...], str, Any]
 

libs/langgraph/tests/conftest.py

@@ -272,6 +272,54 @@ async def _store_postgres_aio():
             await conn.execute(f"DROP DATABASE {database}")
 
 
+@asynccontextmanager
+async def _store_postgres_aio_pipe():
+    if sys.version_info < (3, 10):
+        pytest.skip("Async Postgres tests require Python 3.10+")
+    database = f"test_{uuid4().hex[:16]}"
+    async with await AsyncConnection.connect(
+        DEFAULT_POSTGRES_URI, autocommit=True
+    ) as conn:
+        await conn.execute(f"CREATE DATABASE {database}")
+    try:
+        async with AsyncPostgresStore.from_conn_string(
+            DEFAULT_POSTGRES_URI + database
+        ) as store:
+            await store.setup()  # Run in its own transaction
+        async with AsyncPostgresStore.from_conn_string(
+            DEFAULT_POSTGRES_URI + database, pipeline=True
+        ) as store:
+            yield store
+    finally:
+        async with await AsyncConnection.connect(
+            DEFAULT_POSTGRES_URI, autocommit=True
+        ) as conn:
+            await conn.execute(f"DROP DATABASE {database}")
+
+
+@asynccontextmanager
+async def _store_postgres_aio_pool():
+    if sys.version_info < (3, 10):
+        pytest.skip("Async Postgres tests require Python 3.10+")
+    database = f"test_{uuid4().hex[:16]}"
+    async with await AsyncConnection.connect(
+        DEFAULT_POSTGRES_URI, autocommit=True
+    ) as conn:
+        await conn.execute(f"CREATE DATABASE {database}")
+    try:
+        async with AsyncPostgresStore.from_conn_string(
+            DEFAULT_POSTGRES_URI + database,
+            pool_config={"max_size": 10},
+        ) as store:
+            await store.setup()
+            yield store
+    finally:
+        async with await AsyncConnection.connect(
+            DEFAULT_POSTGRES_URI, autocommit=True
+        ) as conn:
+            await conn.execute(f"DROP DATABASE {database}")
+
+
 @asynccontextmanager
 async def _store_duckdb_aio():
     async with AsyncDuckDBStore.from_conn_string(":memory:") as store:
@@ -296,6 +344,45 @@ def store_postgres():
             conn.execute(f"DROP DATABASE {database}")
 
 
+@pytest.fixture(scope="function")
+def store_postgres_pipe():
+    database = f"test_{uuid4().hex[:16]}"
+    # create unique db
+    with Connection.connect(DEFAULT_POSTGRES_URI, autocommit=True) as conn:
+        conn.execute(f"CREATE DATABASE {database}")
+    try:
+        # yield store
+        with PostgresStore.from_conn_string(DEFAULT_POSTGRES_URI + database) as store:
+            store.setup()  # Run in its own transaction
+        with PostgresStore.from_conn_string(
+            DEFAULT_POSTGRES_URI + database, pipeline=True
+        ) as store:
+            yield store
+    finally:
+        # drop unique db
+        with Connection.connect(DEFAULT_POSTGRES_URI, autocommit=True) as conn:
+            conn.execute(f"DROP DATABASE {database}")
+
+
+@pytest.fixture(scope="function")
+def store_postgres_pool():
+    database = f"test_{uuid4().hex[:16]}"
+    # create unique db
+    with Connection.connect(DEFAULT_POSTGRES_URI, autocommit=True) as conn:
+        conn.execute(f"CREATE DATABASE {database}")
+    try:
+        # yield store
+        with PostgresStore.from_conn_string(
+            DEFAULT_POSTGRES_URI + database, pool_config={"max_size": 10}
+        ) as store:
+            store.setup()
+            yield store
+    finally:
+        # drop unique db
+        with Connection.connect(DEFAULT_POSTGRES_URI, autocommit=True) as conn:
+            conn.execute(f"DROP DATABASE {database}")
+
+
 @pytest.fixture(scope="function")
 def store_duckdb():
     with DuckDBStore.from_conn_string(":memory:") as store:
@@ -317,6 +404,12 @@ async def awith_store(store_name: Optional[str]) -> AsyncIterator[BaseStore]:
     elif store_name == "postgres_aio":
         async with _store_postgres_aio() as store:
             yield store
+    elif store_name == "postgres_aio_pipe":
+        async with _store_postgres_aio_pipe() as store:
+            yield store
+    elif store_name == "postgres_aio_pool":
+        async with _store_postgres_aio_pool() as store:
+            yield store
     elif store_name == "duckdb_aio":
         async with _store_duckdb_aio() as store:
             yield store
@@ -342,5 +435,17 @@ ALL_CHECKPOINTERS_ASYNC_PLUS_NONE = [
     *ALL_CHECKPOINTERS_ASYNC,
     None,
 ]
-ALL_STORES_SYNC = ["in_memory", "postgres", "duckdb"]
-ALL_STORES_ASYNC = ["in_memory", "postgres_aio", "duckdb_aio"]
+ALL_STORES_SYNC = [
+    "in_memory",
+    "postgres",
+    "postgres_pipe",
+    "postgres_pool",
+    "duckdb",
+]
+ALL_STORES_ASYNC = [
+    "in_memory",
+    "postgres_aio",
+    "postgres_aio_pipe",
+    "postgres_aio_pool",
+    "duckdb_aio",
+]

libs/langgraph/tests/test_pregel.py

@@ -1,5 +1,6 @@
 import enum
 import json
+import logging
 import operator
 import re
 import time
@@ -67,16 +68,9 @@ from langgraph.errors import InvalidUpdateError, MultipleSubgraphsError, NodeInt
 from langgraph.graph import END, Graph, GraphCommand, StateGraph
 from langgraph.graph.message import MessageGraph, MessagesState, add_messages
 from langgraph.managed.shared_value import SharedValue
-from langgraph.prebuilt.chat_agent_executor import (
-    create_tool_calling_executor,
-)
+from langgraph.prebuilt.chat_agent_executor import create_tool_calling_executor
 from langgraph.prebuilt.tool_node import ToolNode
-from langgraph.pregel import (
-    Channel,
-    GraphRecursionError,
-    Pregel,
-    StateSnapshot,
-)
+from langgraph.pregel import Channel, GraphRecursionError, Pregel, StateSnapshot
 from langgraph.pregel.retry import RetryPolicy
 from langgraph.store.base import BaseStore
 from langgraph.store.memory import InMemoryStore
@@ -104,6 +98,8 @@ from tests.messages import (
     _AnyIdToolMessage,
 )
 
+logger = logging.getLogger(__name__)
+
 
 # define these objects to avoid importing langchain_core.agents
 # and therefore avoid relying on core Pydantic version
@@ -6635,11 +6631,7 @@ def test_message_graph(
     from langchain_core.language_models.fake_chat_models import (
         FakeMessagesListChatModel,
     )
-    from langchain_core.messages import (
-        AIMessage,
-        BaseMessage,
-        HumanMessage,
-    )
+    from langchain_core.messages import AIMessage, BaseMessage, HumanMessage
     from langchain_core.outputs import ChatGeneration, ChatResult
     from langchain_core.tools import tool
 
@@ -13944,50 +13936,75 @@ def test_store_injected(
 
     doc_id = str(uuid.uuid4())
     doc = {"some-key": "this-is-a-val"}
-
-    def node(input: State, config: RunnableConfig, store: BaseStore):
-        assert isinstance(store, BaseStore)
-        store.put(
-            ("foo", "bar"),
-            doc_id,
-            {
-                **doc,
-                "from_thread": config["configurable"]["thread_id"],
-                "some_val": input["count"],
-            },
-        )
-        return {"count": 1}
-
-    builder = StateGraph(State)
-    builder.add_node("node", node)
-    builder.add_edge("__start__", "node")
-    graph = builder.compile(store=the_store, checkpointer=checkpointer)
-
+    uid = uuid.uuid4().hex
+    namespace = (f"foo-{uid}", "bar")
     thread_1 = str(uuid.uuid4())
-    result = graph.invoke({"count": 0}, {"configurable": {"thread_id": thread_1}})
-    assert result == {"count": 1}
-    returned_doc = the_store.get(("foo", "bar"), doc_id).value
-    assert returned_doc == {**doc, "from_thread": thread_1, "some_val": 0}
-    assert len(the_store.search(("foo", "bar"))) == 1
-
-    # Check update on existing thread
-    result = graph.invoke({"count": 0}, {"configurable": {"thread_id": thread_1}})
-    assert result == {"count": 2}
-    returned_doc = the_store.get(("foo", "bar"), doc_id).value
-    assert returned_doc == {**doc, "from_thread": thread_1, "some_val": 1}
-    assert len(the_store.search(("foo", "bar"))) == 1
-
     thread_2 = str(uuid.uuid4())
 
+    class Node:
+        def __init__(self, i: Optional[int] = None):
+            self.i = i
+
+        def __call__(self, inputs: State, config: RunnableConfig, store: BaseStore):
+            assert isinstance(store, BaseStore)
+            store.put(
+                namespace
+                if self.i is not None
+                and config["configurable"]["thread_id"] in (thread_1, thread_2)
+                else (f"foo_{self.i}", "bar"),
+                doc_id,
+                {
+                    **doc,
+                    "from_thread": config["configurable"]["thread_id"],
+                    "some_val": inputs["count"],
+                },
+            )
+            return {"count": 1}
+
+    builder = StateGraph(State)
+    builder.add_node("node", Node())
+    builder.add_edge("__start__", "node")
+    N = 500
+    M = 1
+    if "duckdb" in store_name:
+        logger.warning(
+            "DuckDB store implementation has a known issue that does not"
+            " support concurrent writes, so we're reducing the test scope"
+        )
+        N = M = 1
+
+    for i in range(N):
+        builder.add_node(f"node_{i}", Node(i))
+        builder.add_edge("__start__", f"node_{i}")
+
+    graph = builder.compile(store=the_store, checkpointer=checkpointer)
+
+    results = graph.batch(
+        [{"count": 0}] * M,
+        ([{"configurable": {"thread_id": str(uuid.uuid4())}}] * (M - 1))
+        + [{"configurable": {"thread_id": thread_1}}],
+    )
+    result = results[-1]
+    assert result == {"count": N + 1}
+    returned_doc = the_store.get(namespace, doc_id).value
+    assert returned_doc == {**doc, "from_thread": thread_1, "some_val": 0}
+    assert len(the_store.search(namespace)) == 1
+    # Check results after another turn of the same thread
+    result = graph.invoke({"count": 0}, {"configurable": {"thread_id": thread_1}})
+    assert result == {"count": (N + 1) * 2}
+    returned_doc = the_store.get(namespace, doc_id).value
+    assert returned_doc == {**doc, "from_thread": thread_1, "some_val": N + 1}
+    assert len(the_store.search(namespace)) == 1
+
     result = graph.invoke({"count": 0}, {"configurable": {"thread_id": thread_2}})
-    assert result == {"count": 1}
-    returned_doc = the_store.get(("foo", "bar"), doc_id).value
+    assert result == {"count": N + 1}
+    returned_doc = the_store.get(namespace, doc_id).value
     assert returned_doc == {
         **doc,
         "from_thread": thread_2,
         "some_val": 0,
     }  # Overwrites the whole doc
-    assert len(the_store.search(("foo", "bar"))) == 1  # still overwriting the same one
+    assert len(the_store.search(namespace)) == 1  # still overwriting the same one
 
 
 def test_enum_node_names():
@@ -14385,3 +14402,79 @@ def test_runnable_passthrough_node_graph() -> None:
     graph = graph_builder.compile()
 
     assert graph.get_graph(xray=True).to_json() == graph.get_graph(xray=False).to_json()
+
+
+@pytest.mark.parametrize("checkpointer_name", ALL_CHECKPOINTERS_SYNC)
+def test_parent_command(request: pytest.FixtureRequest, checkpointer_name: str) -> None:
+    from langchain_core.messages import BaseMessage
+    from langchain_core.tools import tool
+
+    @tool(return_direct=True)
+    def get_user_name() -> GraphCommand:
+        """Retrieve user name"""
+        return GraphCommand(update={"user_name": "Meow"}, graph=GraphCommand.PARENT)
+
+    subgraph_builder = StateGraph(MessagesState)
+    subgraph_builder.add_node("tool", get_user_name)
+    subgraph_builder.add_edge(START, "tool")
+    subgraph = subgraph_builder.compile()
+
+    class CustomParentState(TypedDict):
+        messages: Annotated[list[BaseMessage], add_messages]
+        # this key is not available to the child graph
+        user_name: str
+
+    builder = StateGraph(CustomParentState)
+    builder.add_node("alice", subgraph)
+    builder.add_edge(START, "alice")
+    checkpointer = request.getfixturevalue(f"checkpointer_{checkpointer_name}")
+    graph = builder.compile(checkpointer=checkpointer)
+
+    config = {"configurable": {"thread_id": "1"}}
+
+    assert graph.invoke({"messages": [("user", "get user name")]}, config) == {
+        "messages": [
+            _AnyIdHumanMessage(
+                content="get user name", additional_kwargs={}, response_metadata={}
+            ),
+        ],
+        "user_name": "Meow",
+    }
+    assert graph.get_state(config) == StateSnapshot(
+        values={
+            "messages": [
+                _AnyIdHumanMessage(
+                    content="get user name", additional_kwargs={}, response_metadata={}
+                ),
+            ],
+            "user_name": "Meow",
+        },
+        next=(),
+        config={
+            "configurable": {
+                "thread_id": "1",
+                "checkpoint_ns": "",
+                "checkpoint_id": AnyStr(),
+            }
+        },
+        metadata={
+            "source": "loop",
+            "writes": {
+                "alice": {
+                    "user_name": "Meow",
+                }
+            },
+            "thread_id": "1",
+            "step": 1,
+            "parents": {},
+        },
+        created_at=AnyStr(),
+        parent_config={
+            "configurable": {
+                "thread_id": "1",
+                "checkpoint_ns": "",
+                "checkpoint_id": AnyStr(),
+            }
+        },
+        tasks=(),
+    )

libs/langgraph/tests/test_pregel_async.py

@@ -1,4 +1,5 @@
 import asyncio
+import logging
 import operator
 import random
 import re
@@ -100,6 +101,8 @@ from tests.messages import (
     _AnyIdToolMessage,
 )
 
+logger = logging.getLogger(__name__)
+
 pytestmark = pytest.mark.anyio
 
 
@@ -12272,60 +12275,89 @@ async def test_store_injected_async(checkpointer_name: str, store_name: str) ->
 
     doc_id = str(uuid.uuid4())
     doc = {"some-key": "this-is-a-val"}
+    uid = uuid.uuid4().hex
+    namespace = (f"foo-{uid}", "bar")
+    thread_1 = str(uuid.uuid4())
+    thread_2 = str(uuid.uuid4())
 
-    async def node(input: State, config: RunnableConfig, store: BaseStore):
-        assert isinstance(store, BaseStore)
-        await store.aput(
-            ("foo", "bar"),
-            doc_id,
-            {
-                **doc,
-                "from_thread": config["configurable"]["thread_id"],
-                "some_val": input["count"],
-            },
-        )
-        return {"count": 1}
+    class Node:
+        def __init__(self, i: Optional[int] = None):
+            self.i = i
+
+        async def __call__(
+            self, inputs: State, config: RunnableConfig, store: BaseStore
+        ):
+            assert isinstance(store, BaseStore)
+            await store.aput(
+                namespace
+                if self.i is not None
+                and config["configurable"]["thread_id"] in (thread_1, thread_2)
+                else (f"foo_{self.i}", "bar"),
+                doc_id,
+                {
+                    **doc,
+                    "from_thread": config["configurable"]["thread_id"],
+                    "some_val": inputs["count"],
+                },
+            )
+            return {"count": 1}
 
     builder = StateGraph(State)
-    builder.add_node("node", node)
+    builder.add_node("node", Node())
     builder.add_edge("__start__", "node")
+
+    N = 500
+    M = 1
+    if "duckdb" in store_name:
+        logger.warning(
+            "DuckDB store implementation has a known issue that does not"
+            " support concurrent writes, so we're reducing the test scope"
+        )
+        N = M = 1
+
+    for i in range(N):
+        builder.add_node(f"node_{i}", Node(i))
+        builder.add_edge("__start__", f"node_{i}")
+
     async with awith_checkpointer(checkpointer_name) as checkpointer, awith_store(
         store_name
     ) as the_store:
         graph = builder.compile(store=the_store, checkpointer=checkpointer)
 
-        thread_1 = str(uuid.uuid4())
-        result = await graph.ainvoke(
-            {"count": 0}, {"configurable": {"thread_id": thread_1}}
+        # Test batch operations with multiple threads
+        results = await graph.abatch(
+            [{"count": 0}] * M,
+            ([{"configurable": {"thread_id": str(uuid.uuid4())}}] * (M - 1))
+            + [{"configurable": {"thread_id": thread_1}}],
         )
-        assert result == {"count": 1}
-        returned_doc = (await the_store.aget(("foo", "bar"), doc_id)).value
+        result = results[-1]
+        assert result == {"count": N + 1}
+        returned_doc = (await the_store.aget(namespace, doc_id)).value
         assert returned_doc == {**doc, "from_thread": thread_1, "some_val": 0}
-        assert len((await the_store.asearch(("foo", "bar")))) == 1
+        assert len((await the_store.asearch(namespace))) == 1
 
-        # Check update on existing thread
+        # Check results after another turn of the same thread
         result = await graph.ainvoke(
             {"count": 0}, {"configurable": {"thread_id": thread_1}}
         )
-        assert result == {"count": 2}
-        returned_doc = (await the_store.aget(("foo", "bar"), doc_id)).value
-        assert returned_doc == {**doc, "from_thread": thread_1, "some_val": 1}
-        assert len((await the_store.asearch(("foo", "bar")))) == 1
-
-        thread_2 = str(uuid.uuid4())
+        assert result == {"count": (N + 1) * 2}
+        returned_doc = (await the_store.aget(namespace, doc_id)).value
+        assert returned_doc == {**doc, "from_thread": thread_1, "some_val": N + 1}
+        assert len((await the_store.asearch(namespace))) == 1
 
+        # Test with a different thread
         result = await graph.ainvoke(
             {"count": 0}, {"configurable": {"thread_id": thread_2}}
         )
-        assert result == {"count": 1}
-        returned_doc = (await the_store.aget(("foo", "bar"), doc_id)).value
+        assert result == {"count": N + 1}
+        returned_doc = (await the_store.aget(namespace, doc_id)).value
         assert returned_doc == {
             **doc,
             "from_thread": thread_2,
             "some_val": 0,
         }  # Overwrites the whole doc
         assert (
-            len((await the_store.asearch(("foo", "bar")))) == 1
+            len((await the_store.asearch(namespace))) == 1
         )  # still overwriting the same one
 
 
@@ -12565,3 +12597,83 @@ async def test_debug_nested_subgraphs():
                 assert stream_task["interrupts"] == history_task.interrupts
                 assert stream_task.get("error") == history_task.error
                 assert stream_task.get("state") == history_task.state
+
+
+@pytest.mark.parametrize("checkpointer_name", ALL_CHECKPOINTERS_ASYNC)
+async def test_parent_command(checkpointer_name: str) -> None:
+    from langchain_core.messages import BaseMessage
+    from langchain_core.tools import tool
+
+    @tool(return_direct=True)
+    def get_user_name() -> GraphCommand:
+        """Retrieve user name"""
+        return GraphCommand(update={"user_name": "Meow"}, graph=GraphCommand.PARENT)
+
+    subgraph_builder = StateGraph(MessagesState)
+    subgraph_builder.add_node("tool", get_user_name)
+    subgraph_builder.add_edge(START, "tool")
+    subgraph = subgraph_builder.compile()
+
+    class CustomParentState(TypedDict):
+        messages: Annotated[list[BaseMessage], add_messages]
+        # this key is not available to the child graph
+        user_name: str
+
+    builder = StateGraph(CustomParentState)
+    builder.add_node("alice", subgraph)
+    builder.add_edge(START, "alice")
+    async with awith_checkpointer(checkpointer_name) as checkpointer:
+        graph = builder.compile(checkpointer=checkpointer)
+
+        config = {"configurable": {"thread_id": "1"}}
+
+        assert await graph.ainvoke(
+            {"messages": [("user", "get user name")]}, config
+        ) == {
+            "messages": [
+                _AnyIdHumanMessage(
+                    content="get user name", additional_kwargs={}, response_metadata={}
+                ),
+            ],
+            "user_name": "Meow",
+        }
+        assert await graph.aget_state(config) == StateSnapshot(
+            values={
+                "messages": [
+                    _AnyIdHumanMessage(
+                        content="get user name",
+                        additional_kwargs={},
+                        response_metadata={},
+                    ),
+                ],
+                "user_name": "Meow",
+            },
+            next=(),
+            config={
+                "configurable": {
+                    "thread_id": "1",
+                    "checkpoint_ns": "",
+                    "checkpoint_id": AnyStr(),
+                }
+            },
+            metadata={
+                "source": "loop",
+                "writes": {
+                    "alice": {
+                        "user_name": "Meow",
+                    }
+                },
+                "thread_id": "1",
+                "step": 1,
+                "parents": {},
+            },
+            created_at=AnyStr(),
+            parent_config={
+                "configurable": {
+                    "thread_id": "1",
+                    "checkpoint_ns": "",
+                    "checkpoint_id": AnyStr(),
+                }
+            },
+            tasks=(),
+        )

libs/sdk-js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@langchain/langgraph-sdk",
-  "version": "0.0.26",
+  "version": "0.0.28",
   "description": "Client library for interacting with the LangGraph API",
   "type": "module",
   "packageManager": "yarn@1.22.19",

libs/sdk-js/src/client.ts

@@ -33,6 +33,7 @@ import {
   OnConflictBehavior,
 } from "./types.js";
 import { mergeSignals } from "./utils/signals.js";
+import { getEnvironmentVariable } from "./utils/env.js";
 
 /**
  * Get the API key from the environment.
@@ -53,7 +54,7 @@ export function getApiKey(apiKey?: string): string | undefined {
   const prefixes = ["LANGGRAPH", "LANGSMITH", "LANGCHAIN"];
 
   for (const prefix of prefixes) {
-    const envKey = process.env[`${prefix}_API_KEY`];
+    const envKey = getEnvironmentVariable(`${prefix}_API_KEY`);
     if (envKey) {
       // Remove surrounding quotes
       return envKey.trim().replace(/^["']|["']$/g, "");

libs/sdk-js/src/index.ts

@@ -15,6 +15,7 @@ export type {
   ThreadStatus,
   Cron,
   Checkpoint,
+  Interrupt,
 } from "./schema.js";
 
 export type { OnConflictBehavior, Command } from "./types.js";

libs/sdk-js/src/schema.ts

@@ -137,6 +137,16 @@ export interface AssistantGraph {
   }>;
 }
 
+/**
+ * An interrupt thrown inside a thread.
+ */
+export interface Interrupt {
+  value: unknown;
+  when: "during";
+  resumable: boolean;
+  ns?: string[];
+}
+
 export interface Thread<ValuesType = DefaultValues> {
   /** The ID of the thread. */
   thread_id: string;
@@ -155,6 +165,9 @@ export interface Thread<ValuesType = DefaultValues> {
 
   /** The current state of the thread. */
   values: ValuesType;
+
+  /** Interrupts which were thrown in this thread */
+  interrupts: Record<string, Array<Interrupt>>;
 }
 
 export interface Cron {
@@ -210,12 +223,7 @@ export interface ThreadTask {
   name: string;
   result?: unknown;
   error: Optional<string>;
-  interrupts: Array<{
-    value: unknown;
-    when: "during";
-    resumable: boolean;
-    ns?: string[];
-  }>;
+  interrupts: Array<Interrupt>;
   checkpoint: Optional<Checkpoint>;
   state: Optional<ThreadState>;
 }

libs/sdk-js/src/utils/env.ts

@@ -0,0 +1,11 @@
+export function getEnvironmentVariable(name: string): string | undefined {
+  // Certain setups (Deno, frontend) will throw an error if you try to access environment variables
+  try {
+    return typeof process !== "undefined"
+      ? // eslint-disable-next-line no-process-env
+        process.env?.[name]
+      : undefined;
+  } catch (e) {
+    return undefined;
+  }
+}