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Add Postgres Store Implementation (#1906)

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This commit is contained in:
William FH
2024-09-30 21:18:58 +00:00
committed by GitHub
parent 17dc1108a3
commit 97f79fc66b
13 changed files with 1620 additions and 31 deletions
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libs/checkpoint-postgres/langgraph/checkpoint/postgres/__init__.py
+24 -19
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@@ -17,9 +17,7 @@ from langgraph.checkpoint.base import (
CheckpointTuple,
get_checkpoint_id,
)
from langgraph.checkpoint.postgres.base import (
BasePostgresSaver,
)
from langgraph.checkpoint.postgres.base import BasePostgresSaver
from langgraph.checkpoint.serde.base import SerializerProtocol
Conn = Union[Connection[DictRow], ConnectionPool[Connection[DictRow]]]
@@ -167,15 +165,17 @@ class PostgresSaver(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
),
self._load_writes(value["pending_writes"]),
)
@@ -246,15 +246,17 @@ class PostgresSaver(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
),
self._load_writes(value["pending_writes"]),
)
@@ -384,3 +386,6 @@ class PostgresSaver(BasePostgresSaver):
else:
with self.lock, conn.cursor(binary=True, row_factory=dict_row) as cur:
yield cur
__all__ = ["PostgresSaver", "Conn"]