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This commit is contained in:
Nuno Campos
2024-09-10 16:17:22 -07:00
parent 83d36761a4
commit b13db42568
6 changed files with 295 additions and 4 deletions
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libs/checkpoint-postgres/langgraph/checkpoint/postgres/aio.py
+7 -1
View File
@@ -10,6 +10,7 @@ from psycopg.types.json import Jsonb
from psycopg_pool import AsyncConnectionPool
from langgraph.checkpoint.base import (
WRITES_IDX_MAP,
ChannelVersions,
Checkpoint,
CheckpointMetadata,
@@ -292,9 +293,14 @@ class AsyncPostgresSaver(BasePostgresSaver):
writes (Sequence[Tuple[str, Any]]): List of writes to store, each as (channel, value) pair.
task_id (str): Identifier for the task creating the writes.
"""
query = (
self.UPSERT_CHECKPOINT_WRITES_SQL
if all(w[0] in WRITES_IDX_MAP for w in writes)
else self.INSERT_CHECKPOINT_WRITES_SQL
)
async with self._cursor(pipeline=True) as cur:
await cur.executemany(
self.UPSERT_CHECKPOINT_WRITES_SQL,
query,
await asyncio.to_thread(
self._dump_writes,
config["configurable"]["thread_id"],
libs/checkpoint-postgres/langgraph/checkpoint/postgres/base.py
+10
View File
@@ -108,6 +108,15 @@ UPSERT_CHECKPOINTS_SQL = """
"""
UPSERT_CHECKPOINT_WRITES_SQL = """
INSERT INTO checkpoint_writes (thread_id, checkpoint_ns, checkpoint_id, task_id, idx, channel, type, blob)
VALUES (%s, %s, %s, %s, %s, %s, %s, %s)
ON CONFLICT (thread_id, checkpoint_ns, checkpoint_id, task_id, idx) DO UPDATE SET
channel = EXCLUDED.channel,
type = EXCLUDED.type,
blob = EXCLUDED.blob;
"""
INSERT_CHECKPOINT_WRITES_SQL = """
INSERT INTO checkpoint_writes (thread_id, checkpoint_ns, checkpoint_id, task_id, idx, channel, type, blob)
VALUES (%s, %s, %s, %s, %s, %s, %s, %s)
ON CONFLICT (thread_id, checkpoint_ns, checkpoint_id, task_id, idx) DO NOTHING
@@ -120,6 +129,7 @@ class BasePostgresSaver(BaseCheckpointSaver):
UPSERT_CHECKPOINT_BLOBS_SQL = UPSERT_CHECKPOINT_BLOBS_SQL
UPSERT_CHECKPOINTS_SQL = UPSERT_CHECKPOINTS_SQL
UPSERT_CHECKPOINT_WRITES_SQL = UPSERT_CHECKPOINT_WRITES_SQL
INSERT_CHECKPOINT_WRITES_SQL = INSERT_CHECKPOINT_WRITES_SQL
jsonplus_serde = JsonPlusSerializer()