@tanstack/ai-persistence/dist/esm/retrieve.js

Composable state persistence for TanStack AI messages, runs, interrupts, metadata, and locks.

//#region src/retrieve.ts
/**
* Look up a persisted generation artifact's metadata by id. Returns `null` when
* the persistence has no `artifacts` store or no record matches — so a serve
* handler can map that straight to a 404.
*/
async function retrieveArtifact(persistence, artifactId) {
	return await persistence.stores.artifacts?.get(artifactId) ?? null;
}
/**
* Look up a persisted generation artifact's stored bytes. Pass an `artifactId`
* (resolved to its record first) or an already-loaded {@link ArtifactRecord}
* (no second metadata lookup). Returns `null` when the artifact, its record, or
* its blob is missing, or the stores are not configured.
*
* Pass `options.range` to read one slice — how a serve route answers a `Range`
* request with `206` + `Content-Range` instead of the whole file, which is what
* `<video>` seeking is built on. Resolve the range against `record.size` and
* reply `416` yourself when it does not fit; the store is handed satisfiable
* ranges only. The returned object's `range` reports the slice actually served.
*/
async function retrieveBlob(persistence, artifact, options) {
	const record = typeof artifact === "string" ? await retrieveArtifact(persistence, artifact) : artifact;
	if (!record) return null;
	if (!record.blobKey) throw new Error(`Artifact ${record.artifactId} has no blobKey. Records written by 0.x need blob_key backfilled before their bytes can be read.`);
	return await persistence.stores.blobs?.get(record.blobKey, options) ?? null;
}
//#endregion
export { retrieveArtifact, retrieveBlob };

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