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fix(@langchain/langgraph-checkpoint-redis): deserialize checkpointed state #1768

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fix(@langchain/langgraph-checkpoint-redis): deserialize checkpointed state #1768

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46 changes: 36 additions & 10 deletions libs/checkpoint-redis/src/index.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -166,7 +166,7 @@ export class RedisSaver extends BaseCheckpointSaver {
jsonDoc
);

return this.createCheckpointTuple(jsonDoc, checkpoint, pendingWrites);
return await this.createCheckpointTuple(jsonDoc, checkpoint, pendingWrites);
}

async put(
Expand Down Expand Up @@ -388,7 +388,11 @@ export class RedisSaver extends BaseCheckpointSaver {
// Load checkpoint with pending writes and migrate sends
const { checkpoint, pendingWrites } =
await this.loadCheckpointWithWrites(jsonDoc);
yield this.createCheckpointTuple(jsonDoc, checkpoint, pendingWrites);
yield await this.createCheckpointTuple(
jsonDoc,
checkpoint,
pendingWrites
);
yieldedCount++;
}

Expand Down Expand Up @@ -465,7 +469,7 @@ export class RedisSaver extends BaseCheckpointSaver {
// Load checkpoint with pending writes and migrate sends
const { checkpoint, pendingWrites } =
await this.loadCheckpointWithWrites(jsonDoc);
yield this.createCheckpointTuple(
yield await this.createCheckpointTuple(
jsonDoc,
checkpoint,
pendingWrites
Expand Down Expand Up @@ -555,7 +559,11 @@ export class RedisSaver extends BaseCheckpointSaver {
// Load checkpoint with pending writes and migrate sends
const { checkpoint, pendingWrites } =
await this.loadCheckpointWithWrites(jsonDoc);
yield this.createCheckpointTuple(jsonDoc, checkpoint, pendingWrites);
yield await this.createCheckpointTuple(
jsonDoc,
checkpoint,
pendingWrites
);
yieldedCount++;
}
}
Expand Down Expand Up @@ -718,7 +726,16 @@ export class RedisSaver extends BaseCheckpointSaver {

const pendingWrites: Array<[string, string, any]> = [];
for (const writeDoc of writeDocuments) {
pendingWrites.push([writeDoc.task_id, writeDoc.channel, writeDoc.value]);
// Deserialize write value using serde to restore LangChain objects
const deserializedValue = await this.serde.loadsTyped(
"json",
JSON.stringify(writeDoc.value)
);
pendingWrites.push([
writeDoc.task_id,
writeDoc.channel,
deserializedValue,
]);
}

return pendingWrites;
Expand All @@ -729,8 +746,11 @@ export class RedisSaver extends BaseCheckpointSaver {
checkpoint: Checkpoint;
pendingWrites?: Array<[string, string, any]>;
}> {
// Load checkpoint directly from JSON
const checkpoint = { ...jsonDoc.checkpoint };
// Deserialize checkpoint using serde to restore LangChain objects
const checkpoint: Checkpoint = await this.serde.loadsTyped(
"json",
JSON.stringify(jsonDoc.checkpoint)
);

// Migrate pending sends ONLY for OLD checkpoint versions (v < 4) with parents
// Modern checkpoints (v >= 4) should NEVER have pending sends migrated
Expand Down Expand Up @@ -805,15 +825,21 @@ export class RedisSaver extends BaseCheckpointSaver {
}

// Helper method to create checkpoint tuple from json document
private createCheckpointTuple(
private async createCheckpointTuple(
jsonDoc: any,
checkpoint: Checkpoint,
pendingWrites?: Array<[string, string, any]>
): CheckpointTuple {
): Promise<CheckpointTuple> {
// Convert back from "__empty__" to empty string
const checkpointNs =
jsonDoc.checkpoint_ns === "__empty__" ? "" : jsonDoc.checkpoint_ns;

// Deserialize metadata using serde
const metadata = (await this.serde.loadsTyped(
"json",
JSON.stringify(jsonDoc.metadata)
)) as CheckpointMetadata;

return {
config: {
configurable: {
Expand All @@ -823,7 +849,7 @@ export class RedisSaver extends BaseCheckpointSaver {
},
},
checkpoint,
metadata: jsonDoc.metadata,
metadata,
parentConfig: jsonDoc.parent_checkpoint_id
? {
configurable: {
Expand Down
51 changes: 31 additions & 20 deletions libs/checkpoint-redis/src/shallow.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -212,11 +212,11 @@ export class ShallowRedisSaver extends BaseCheckpointSaver {
await this.applyTTL(key);
}

// Channel values are stored inline in shallow mode
const checkpoint = {
...jsonDoc.checkpoint,
channel_values: jsonDoc.checkpoint.channel_values || {},
};
// Deserialize checkpoint using serde to restore LangChain objects
const checkpoint: Checkpoint = await this.serde.loadsTyped(
"json",
JSON.stringify(jsonDoc.checkpoint)
);

// Load pending writes if they exist
let pendingWrites: Array<[string, string, any]> | undefined;
Expand All @@ -228,7 +228,7 @@ export class ShallowRedisSaver extends BaseCheckpointSaver {
);
}

return this.createCheckpointTuple(jsonDoc, checkpoint, pendingWrites);
return await this.createCheckpointTuple(jsonDoc, checkpoint, pendingWrites);
}

async *list(
Expand Down Expand Up @@ -309,12 +309,12 @@ export class ShallowRedisSaver extends BaseCheckpointSaver {
}

// Channel values are inline in shallow mode
const checkpoint = {
...jsonDoc.checkpoint,
channel_values: jsonDoc.checkpoint.channel_values || {},
};
const checkpoint: Checkpoint = await this.serde.loadsTyped(
"json",
JSON.stringify(jsonDoc.checkpoint)
);

yield this.createCheckpointTuple(jsonDoc, checkpoint);
yield await this.createCheckpointTuple(jsonDoc, checkpoint);
yieldCount++;
}
} catch (error: any) {
Expand Down Expand Up @@ -359,12 +359,12 @@ export class ShallowRedisSaver extends BaseCheckpointSaver {
}

// Channel values are inline in shallow mode
const checkpoint = {
...jsonDoc.checkpoint,
channel_values: jsonDoc.checkpoint.channel_values || {},
};
const checkpoint: Checkpoint = await this.serde.loadsTyped(
"json",
JSON.stringify(jsonDoc.checkpoint)
);

yield this.createCheckpointTuple(jsonDoc, checkpoint);
yield await this.createCheckpointTuple(jsonDoc, checkpoint);
yieldCount++;
}
return;
Expand Down Expand Up @@ -507,11 +507,17 @@ export class ShallowRedisSaver extends BaseCheckpointSaver {
}

// Helper method to create checkpoint tuple from json document
private createCheckpointTuple(
private async createCheckpointTuple(
jsonDoc: any,
checkpoint: Checkpoint,
pendingWrites?: Array<[string, string, any]>
): CheckpointTuple {
): Promise<CheckpointTuple> {
// Deserialize metadata using serde
const metadata = (await this.serde.loadsTyped(
"json",
JSON.stringify(jsonDoc.metadata)
)) as CheckpointMetadata;

return {
config: {
configurable: {
Expand All @@ -521,7 +527,7 @@ export class ShallowRedisSaver extends BaseCheckpointSaver {
},
},
checkpoint,
metadata: jsonDoc.metadata,
metadata,
parentConfig: jsonDoc.parent_checkpoint_id
? {
configurable: {
Expand Down Expand Up @@ -572,10 +578,15 @@ export class ShallowRedisSaver extends BaseCheckpointSaver {
for (const writeKey of writeKeys) {
const writeDoc = await this.client.json.get(writeKey);
if (writeDoc) {
// Deserialize write value using serde to restore LangChain objects
const deserializedValue = await this.serde.loadsTyped(
"json",
JSON.stringify(writeDoc.value)
);
pendingWrites.push([
writeDoc.task_id,
writeDoc.channel,
writeDoc.value,
deserializedValue,
]);
}
}
Expand Down