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Remove Checkpoint.pending_sends

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- Instead store sends in a Topic channel, removing the need to fetch sends as writes against the parent checkpoint
- Remove deprecated/unused functions in langgraph-checkpoint (will require bumping min range for langgraph-checkpoint in langgraph lib)
- Implement migration of old pending sends in langgraph-checkpoint-postgres
- Ensure parent config of `checkpoint_during=False` checkpoints always points to checkpoints that were also saved
This commit is contained in:
Nuno Campos
2025-05-25 19:06:02 -07:00
parent 85522ec6a6
commit 4e8fbe4525
31 changed files with 559 additions and 508 deletions
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libs/checkpoint-sqlite/langgraph/checkpoint/sqlite/__init__.py
+1 -3
View File
@@ -19,7 +19,6 @@ from langgraph.checkpoint.base import (
get_checkpoint_metadata,
)
from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
from langgraph.checkpoint.serde.types import ChannelProtocol
from langgraph.checkpoint.sqlite.utils import search_where
_AIO_ERROR_MSG = (
@@ -535,14 +534,13 @@ class SqliteSaver(BaseCheckpointSaver[str]):
"""
raise NotImplementedError(_AIO_ERROR_MSG)
def get_next_version(self, current: Optional[str], channel: ChannelProtocol) -> str:
def get_next_version(self, current: Optional[str]) -> str:
"""Generate the next version ID for a channel.
This method creates a new version identifier for a channel based on its current version.
Args:
current (Optional[str]): The current version identifier of the channel.
channel (BaseChannel): The channel being versioned.
Returns:
str: The next version identifier, which is guaranteed to be monotonically increasing.
libs/checkpoint-sqlite/langgraph/checkpoint/sqlite/aio.py
+1 -3
View File
@@ -19,7 +19,6 @@ from langgraph.checkpoint.base import (
get_checkpoint_metadata,
)
from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
from langgraph.checkpoint.serde.types import ChannelProtocol
from langgraph.checkpoint.sqlite.utils import search_where
T = TypeVar("T", bound=Callable)
@@ -590,14 +589,13 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
)
await self.conn.commit()
def get_next_version(self, current: Optional[str], channel: ChannelProtocol) -> str:
def get_next_version(self, current: Optional[str]) -> str:
"""Generate the next version ID for a channel.
This method creates a new version identifier for a channel based on its current version.
Args:
current (Optional[str]): The current version identifier of the channel.
channel (BaseChannel): The channel being versioned.
Returns:
str: The next version identifier, which is guaranteed to be monotonically increasing.