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import type { StoredChunk } from "@dispatch/wire";
import type {
ConversationCacheIndexEntry,
ConversationChunkStore,
} from "../../features/conversation-cache";
const DEFAULT_DB_NAME = "dispatch-chunk-cache";
const DB_VERSION = 1;
const CHUNKS_STORE = "chunks";
const META_STORE = "meta";
interface ChunkRecord {
conversationId: string;
seq: number;
role: StoredChunk["role"];
chunk: StoredChunk["chunk"];
}
interface MetaRecord {
conversationId: string;
lastAccess: number;
}
export interface CreateIdbChunkStoreOptions {
indexedDB?: IDBFactory;
dbName?: string;
}
function requestToPromise<T>(req: IDBRequest<T>): Promise<T> {
return new Promise<T>((resolve, reject) => {
req.onsuccess = () => resolve(req.result);
req.onerror = () => reject(req.error);
});
}
function txComplete(tx: IDBTransaction): Promise<void> {
return new Promise<void>((resolve, reject) => {
tx.oncomplete = () => resolve();
tx.onerror = () => reject(tx.error);
tx.onabort = () => reject(tx.error);
});
}
function openDb(idb: IDBFactory, dbName: string): Promise<IDBDatabase> {
return new Promise<IDBDatabase>((resolve, reject) => {
const req = idb.open(dbName, DB_VERSION);
req.onupgradeneeded = () => {
const db = req.result;
if (!db.objectStoreNames.contains(CHUNKS_STORE)) {
const store = db.createObjectStore(CHUNKS_STORE, {
keyPath: ["conversationId", "seq"],
});
store.createIndex("byConversation", "conversationId");
}
if (!db.objectStoreNames.contains(META_STORE)) {
db.createObjectStore(META_STORE, { keyPath: "conversationId" });
}
};
req.onsuccess = () => resolve(req.result);
req.onerror = () => reject(req.error);
});
}
function keyRangeFor(conversationId: string): IDBKeyRange {
const lower: [string, number] = [conversationId, 0];
const upper: [string, number] = [conversationId, Number.POSITIVE_INFINITY];
return IDBKeyRange.bound(lower, upper);
}
function chunksToStoredChunks(records: ChunkRecord[]): StoredChunk[] {
return records.map((r) => ({ seq: r.seq, role: r.role, chunk: r.chunk }));
}
export function createIdbChunkStore(opts?: CreateIdbChunkStoreOptions): ConversationChunkStore {
const idb = opts?.indexedDB ?? globalThis.indexedDB;
const dbName = opts?.dbName ?? DEFAULT_DB_NAME;
let dbPromise: Promise<IDBDatabase> | null = null;
function getDb(): Promise<IDBDatabase> {
if (dbPromise === null) {
dbPromise = openDb(idb, dbName);
}
return dbPromise;
}
return {
async load(conversationId: string): Promise<readonly StoredChunk[]> {
const db = await getDb();
const tx = db.transaction(CHUNKS_STORE, "readonly");
const store = tx.objectStore(CHUNKS_STORE);
const range = keyRangeFor(conversationId);
const records = await requestToPromise<ChunkRecord[]>(store.getAll(range));
await txComplete(tx);
records.sort((a, b) => a.seq - b.seq);
return chunksToStoredChunks(records);
},
async append(conversationId: string, chunks: readonly StoredChunk[]): Promise<void> {
if (chunks.length === 0) return;
const db = await getDb();
const tx = db.transaction([CHUNKS_STORE, META_STORE], "readwrite");
const chunkStore = tx.objectStore(CHUNKS_STORE);
const metaStore = tx.objectStore(META_STORE);
for (const c of chunks) {
chunkStore.put({
conversationId,
seq: c.seq,
role: c.role,
chunk: c.chunk,
} satisfies ChunkRecord);
}
metaStore.put({
conversationId,
lastAccess: Date.now(),
} satisfies MetaRecord);
await txComplete(tx);
},
async delete(conversationId: string): Promise<void> {
const db = await getDb();
const tx = db.transaction([CHUNKS_STORE, META_STORE], "readwrite");
const chunkStore = tx.objectStore(CHUNKS_STORE);
const metaStore = tx.objectStore(META_STORE);
chunkStore.delete(keyRangeFor(conversationId));
metaStore.delete(conversationId);
await txComplete(tx);
},
async index(): Promise<readonly ConversationCacheIndexEntry[]> {
const db = await getDb();
const tx = db.transaction([CHUNKS_STORE, META_STORE], "readonly");
const chunkStore = tx.objectStore(CHUNKS_STORE);
const metaStore = tx.objectStore(META_STORE);
const allChunks = await requestToPromise<ChunkRecord[]>(chunkStore.getAll());
const allMeta = await requestToPromise<MetaRecord[]>(metaStore.getAll());
await txComplete(tx);
const metaMap = new Map<string, number>();
for (const m of allMeta) {
metaMap.set(m.conversationId, m.lastAccess);
}
const grouped = new Map<string, { chunkCount: number; maxSeq: number }>();
for (const r of allChunks) {
const existing = grouped.get(r.conversationId);
if (existing === undefined) {
grouped.set(r.conversationId, { chunkCount: 1, maxSeq: r.seq });
} else {
existing.chunkCount++;
if (r.seq > existing.maxSeq) {
existing.maxSeq = r.seq;
}
}
}
const result: ConversationCacheIndexEntry[] = [];
for (const [conversationId, stats] of grouped) {
const lastAccess = metaMap.get(conversationId);
result.push({
conversationId,
chunkCount: stats.chunkCount,
maxSeq: stats.maxSeq,
...(lastAccess !== undefined ? { lastAccess } : {}),
});
}
return result;
},
};
}
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