@tldraw/editor/dist-esm/lib/utils/sync/TLLocalSyncClient.mjs.map

tldraw infinite canvas SDK (editor).

{
  "version": 3,
  "sources": ["../../../../src/lib/utils/sync/TLLocalSyncClient.ts"],
  "sourcesContent": ["import { Signal, transact } from '@tldraw/state'\nimport { RecordsDiff, SerializedSchema, UnknownRecord, squashRecordDiffs } from '@tldraw/store'\nimport { TLStore } from '@tldraw/tlschema'\nimport { assert } from '@tldraw/utils'\nimport {\n\tTAB_ID,\n\tTLSessionStateSnapshot,\n\tcreateSessionStateSnapshotSignal,\n\textractSessionStateFromLegacySnapshot,\n\tloadSessionStateSnapshotIntoStore,\n} from '../../config/TLSessionStateSnapshot'\nimport { LocalIndexedDb } from './LocalIndexedDb'\nimport { showCantReadFromIndexDbAlert, showCantWriteToIndexDbAlert } from './alerts'\n\n/** How should we debounce persists? */\nconst PERSIST_THROTTLE_MS = 350\n/** If we're in an error state, how long should we wait before retrying a write? */\nconst PERSIST_RETRY_THROTTLE_MS = 10_000\n\nconst UPDATE_INSTANCE_STATE = Symbol('UPDATE_INSTANCE_STATE')\n\n/**\n * IMPORTANT!!!\n *\n * This is just a quick-n-dirty temporary solution that will be replaced with the remote sync client\n * once it has the db integrated\n */\n\ninterface SyncMessage {\n\ttype: 'diff'\n\tstoreId: string\n\tchanges: RecordsDiff<UnknownRecord>\n\tschema: SerializedSchema\n}\n\n// Sent by new clients when they connect\n// If another client is on the channel with a newer schema version\n// It will\ninterface AnnounceMessage {\n\ttype: 'announce'\n\tschema: SerializedSchema\n}\n\ntype Message = SyncMessage | AnnounceMessage\n\ntype UnpackPromise<T> = T extends Promise<infer U> ? U : T\n\nconst msg = (msg: Message) => msg\n\n/** @internal */\nexport class BroadcastChannelMock {\n\tonmessage?: (e: MessageEvent) => void\n\tconstructor(_name: string) {\n\t\t// noop\n\t}\n\tpostMessage(_msg: Message) {\n\t\t// noop\n\t}\n\tclose() {\n\t\t// noop\n\t}\n}\n\nconst BC = typeof BroadcastChannel === 'undefined' ? BroadcastChannelMock : BroadcastChannel\n\n/** @internal */\nexport class TLLocalSyncClient {\n\tprivate disposables = new Set<() => void>()\n\tprivate diffQueue: Array<RecordsDiff<UnknownRecord> | typeof UPDATE_INSTANCE_STATE> = []\n\tprivate didDispose = false\n\tprivate shouldDoFullDBWrite = true\n\tprivate isReloading = false\n\treadonly persistenceKey: string\n\treadonly sessionId: string\n\treadonly serializedSchema: SerializedSchema\n\tprivate isDebugging = false\n\tprivate readonly documentTypes: ReadonlySet<string>\n\tprivate readonly $sessionStateSnapshot: Signal<TLSessionStateSnapshot | null>\n\t/** @internal */\n\treadonly db: LocalIndexedDb\n\n\tinitTime = Date.now()\n\tprivate debug(...args: any[]) {\n\t\tif (this.isDebugging) {\n\t\t\t// eslint-disable-next-line no-console\n\t\t\tconsole.debug(...args)\n\t\t}\n\t}\n\tconstructor(\n\t\tpublic readonly store: TLStore,\n\t\t{\n\t\t\tpersistenceKey,\n\t\t\tsessionId = TAB_ID,\n\t\t\tonLoad,\n\t\t\tonLoadError,\n\t\t}: {\n\t\t\tpersistenceKey: string\n\t\t\tsessionId?: string\n\t\t\tonLoad(self: TLLocalSyncClient): void\n\t\t\tonLoadError(error: Error): void\n\t\t},\n\t\tpublic readonly channel = new BC(`tldraw-tab-sync-${persistenceKey}`)\n\t) {\n\t\tif (typeof window !== 'undefined') {\n\t\t\t;(window as any).tlsync = this\n\t\t}\n\t\tthis.persistenceKey = persistenceKey\n\t\tthis.sessionId = sessionId\n\t\tthis.db = new LocalIndexedDb(persistenceKey)\n\t\tthis.disposables.add(() => this.db.close())\n\n\t\tthis.serializedSchema = this.store.schema.serialize()\n\t\tthis.$sessionStateSnapshot = createSessionStateSnapshotSignal(this.store)\n\n\t\tthis.disposables.add(\n\t\t\t// Set up a subscription to changes from the store: When\n\t\t\t// the store changes (and if the change was made by the user)\n\t\t\t// then immediately send the diff to other tabs via postMessage\n\t\t\t// and schedule a persist.\n\t\t\tstore.listen(\n\t\t\t\t({ changes }) => {\n\t\t\t\t\tthis.diffQueue.push(changes)\n\t\t\t\t\tthis.channel.postMessage(\n\t\t\t\t\t\tmsg({\n\t\t\t\t\t\t\ttype: 'diff',\n\t\t\t\t\t\t\tstoreId: this.store.id,\n\t\t\t\t\t\t\tchanges,\n\t\t\t\t\t\t\tschema: this.serializedSchema,\n\t\t\t\t\t\t})\n\t\t\t\t\t)\n\t\t\t\t\tthis.schedulePersist()\n\t\t\t\t},\n\t\t\t\t{ source: 'user', scope: 'document' }\n\t\t\t)\n\t\t)\n\t\tthis.disposables.add(\n\t\t\tstore.listen(\n\t\t\t\t() => {\n\t\t\t\t\tthis.diffQueue.push(UPDATE_INSTANCE_STATE)\n\t\t\t\t\tthis.schedulePersist()\n\t\t\t\t},\n\t\t\t\t{ scope: 'session' }\n\t\t\t)\n\t\t)\n\n\t\tthis.connect(onLoad, onLoadError)\n\n\t\tthis.documentTypes = new Set(\n\t\t\tObject.values(this.store.schema.types)\n\t\t\t\t.filter((t) => t.scope === 'document')\n\t\t\t\t.map((t) => t.typeName)\n\t\t)\n\t}\n\n\tprivate async connect(onLoad: (client: this) => void, onLoadError: (error: Error) => void) {\n\t\tthis.debug('connecting')\n\t\tlet data: UnpackPromise<ReturnType<LocalIndexedDb['load']>> | undefined\n\n\t\ttry {\n\t\t\tdata = await this.db.load({ sessionId: this.sessionId })\n\t\t} catch (error: any) {\n\t\t\tonLoadError(error)\n\t\t\tshowCantReadFromIndexDbAlert()\n\t\t\treturn\n\t\t}\n\n\t\tthis.debug('loaded data from store', data, 'didDispose', this.didDispose)\n\t\tif (this.didDispose) return\n\n\t\ttry {\n\t\t\tif (data) {\n\t\t\t\tconst documentSnapshot = Object.fromEntries(data.records.map((r) => [r.id, r]))\n\t\t\t\tconst sessionStateSnapshot =\n\t\t\t\t\tdata.sessionStateSnapshot ?? extractSessionStateFromLegacySnapshot(documentSnapshot)\n\t\t\t\tconst migrationResult = this.store.schema.migrateStoreSnapshot({\n\t\t\t\t\tstore: documentSnapshot,\n\t\t\t\t\t// eslint-disable-next-line @typescript-eslint/no-deprecated\n\t\t\t\t\tschema: data.schema ?? this.store.schema.serializeEarliestVersion(),\n\t\t\t\t})\n\n\t\t\t\tif (migrationResult.type === 'error') {\n\t\t\t\t\tconsole.error('failed to migrate store', migrationResult)\n\t\t\t\t\tonLoadError(new Error(`Failed to migrate store: ${migrationResult.reason}`))\n\t\t\t\t\treturn\n\t\t\t\t}\n\n\t\t\t\tconst records = Object.values(migrationResult.value).filter((r) =>\n\t\t\t\t\tthis.documentTypes.has(r.typeName)\n\t\t\t\t)\n\t\t\t\tif (records.length > 0) {\n\t\t\t\t\t// 3. Merge the changes into the REAL STORE\n\t\t\t\t\tthis.store.mergeRemoteChanges(() => {\n\t\t\t\t\t\t// Calling put will validate the records!\n\t\t\t\t\t\tthis.store.put(records, 'initialize')\n\t\t\t\t\t})\n\t\t\t\t}\n\n\t\t\t\tif (sessionStateSnapshot) {\n\t\t\t\t\tloadSessionStateSnapshotIntoStore(this.store, sessionStateSnapshot, {\n\t\t\t\t\t\tforceOverwrite: true,\n\t\t\t\t\t})\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.channel.onmessage = ({ data }) => {\n\t\t\t\tthis.debug('got message', data)\n\t\t\t\tconst msg = data as Message\n\t\t\t\t// if their schema is earlier than ours, we need to tell them so they can refresh\n\t\t\t\t// if their schema is later than ours, we need to refresh\n\t\t\t\tconst res = this.store.schema.getMigrationsSince(msg.schema)\n\n\t\t\t\tif (!res.ok) {\n\t\t\t\t\t// we are older, refresh\n\t\t\t\t\t// but add a safety check to make sure we don't get in an infinite loop\n\t\t\t\t\tconst timeSinceInit = Date.now() - this.initTime\n\t\t\t\t\tif (timeSinceInit < 5000) {\n\t\t\t\t\t\t// This tab was just reloaded, but is out of date compared to other tabs.\n\t\t\t\t\t\t// Not expecting this to ever happen. It should only happen if we roll back a release that incremented\n\t\t\t\t\t\t// the schema version (which we should never do)\n\t\t\t\t\t\t// Or maybe during development if you have multiple local tabs open running the app on prod mode and you\n\t\t\t\t\t\t// check out an older commit. Dev server should be fine.\n\t\t\t\t\t\tonLoadError(new Error('Schema mismatch, please close other tabs and reload the page'))\n\t\t\t\t\t\treturn\n\t\t\t\t\t}\n\t\t\t\t\tthis.debug('reloading')\n\t\t\t\t\tthis.isReloading = true\n\t\t\t\t\twindow?.location?.reload?.()\n\t\t\t\t\treturn\n\t\t\t\t} else if (res.value.length > 0) {\n\t\t\t\t\t// they are older, tell them to refresh and not write any more data\n\t\t\t\t\tthis.debug('telling them to reload')\n\t\t\t\t\tthis.channel.postMessage({ type: 'announce', schema: this.serializedSchema })\n\t\t\t\t\t// schedule a full db write in case they wrote data anyway\n\t\t\t\t\tthis.shouldDoFullDBWrite = true\n\t\t\t\t\tthis.persistIfNeeded()\n\t\t\t\t\treturn\n\t\t\t\t}\n\t\t\t\t// otherwise, all good, same version :)\n\t\t\t\tif (msg.type === 'diff') {\n\t\t\t\t\tthis.debug('applying diff')\n\t\t\t\t\ttransact(() => {\n\t\t\t\t\t\tthis.store.mergeRemoteChanges(() => {\n\t\t\t\t\t\t\tthis.store.applyDiff(msg.changes as any)\n\t\t\t\t\t\t})\n\t\t\t\t\t})\n\t\t\t\t}\n\t\t\t}\n\t\t\tthis.channel.postMessage({ type: 'announce', schema: this.serializedSchema })\n\t\t\tthis.disposables.add(() => {\n\t\t\t\tthis.channel.close()\n\t\t\t})\n\t\t\tonLoad(this)\n\t\t} catch (e: any) {\n\t\t\tthis.debug('error loading data from store', e)\n\t\t\tif (this.didDispose) return\n\t\t\tonLoadError(e)\n\t\t\treturn\n\t\t}\n\t}\n\n\tclose() {\n\t\tthis.debug('closing')\n\t\tthis.didDispose = true\n\t\tthis.disposables.forEach((d) => d())\n\t}\n\n\tprivate isPersisting = false\n\tprivate didLastWriteError = false\n\tprivate scheduledPersistTimeout: ReturnType<typeof setTimeout> | null = null\n\n\t/**\n\t * Schedule a persist. Persists don't happen immediately: they are throttled to avoid writing too\n\t * often, and will retry if failed.\n\t *\n\t * @internal\n\t */\n\tprivate schedulePersist() {\n\t\tthis.debug('schedulePersist', this.scheduledPersistTimeout)\n\t\tif (this.scheduledPersistTimeout) return\n\t\t// eslint-disable-next-line no-restricted-globals\n\t\tthis.scheduledPersistTimeout = setTimeout(\n\t\t\t() => {\n\t\t\t\tthis.scheduledPersistTimeout = null\n\t\t\t\tthis.persistIfNeeded()\n\t\t\t},\n\t\t\tthis.didLastWriteError ? PERSIST_RETRY_THROTTLE_MS : PERSIST_THROTTLE_MS\n\t\t)\n\t}\n\n\t/**\n\t * Persist to IndexedDB only under certain circumstances:\n\t *\n\t * - If we're not already persisting\n\t * - If we're not reloading the page\n\t * - And we have something to persist (a full db write scheduled or changes in the diff queue)\n\t *\n\t * @internal\n\t */\n\tprivate persistIfNeeded() {\n\t\tthis.debug('persistIfNeeded', {\n\t\t\tisPersisting: this.isPersisting,\n\t\t\tisReloading: this.isReloading,\n\t\t\tshouldDoFullDBWrite: this.shouldDoFullDBWrite,\n\t\t\tdiffQueueLength: this.diffQueue.length,\n\t\t\tstoreIsPossiblyCorrupt: this.store.isPossiblyCorrupted(),\n\t\t})\n\n\t\t// if we've scheduled a persist for the future, that's no longer needed\n\t\tif (this.scheduledPersistTimeout) {\n\t\t\tclearTimeout(this.scheduledPersistTimeout)\n\t\t\tthis.scheduledPersistTimeout = null\n\t\t}\n\n\t\t// if a persist is already in progress, we don't need to do anything -\n\t\t// if there are still outstanding changes once it's finished, it'll\n\t\t// schedule another persist\n\t\tif (this.isPersisting) return\n\n\t\t// if we're reloading the page, it's because there's a newer client\n\t\t// present so lets not overwrite their changes\n\t\tif (this.isReloading) return\n\n\t\t// if the store is possibly corrupted, we don't want to persist\n\t\tif (this.store.isPossiblyCorrupted()) return\n\n\t\t// if we're scheduled for a full write or if we have changes outstanding, let's persist them!\n\t\tif (this.shouldDoFullDBWrite || this.diffQueue.length > 0) {\n\t\t\tthis.doPersist()\n\t\t}\n\t}\n\n\t/**\n\t * Actually persist to IndexedDB. If the write fails, then we'll retry with a full db write after\n\t * a short delay.\n\t */\n\tprivate async doPersist() {\n\t\tassert(!this.isPersisting, 'persist already in progress')\n\t\tif (this.didDispose) return\n\t\tthis.isPersisting = true\n\n\t\tthis.debug('doPersist start')\n\n\t\t// instantly empty the diff queue, but keep our own copy of it. this way\n\t\t// diffs that come in during the persist will still get tracked\n\t\tconst diffQueue = this.diffQueue\n\t\tthis.diffQueue = []\n\n\t\ttry {\n\t\t\tif (this.shouldDoFullDBWrite) {\n\t\t\t\tthis.shouldDoFullDBWrite = false\n\t\t\t\tawait this.db.storeSnapshot({\n\t\t\t\t\tschema: this.store.schema,\n\t\t\t\t\tsnapshot: this.store.serialize(),\n\t\t\t\t\tsessionId: this.sessionId,\n\t\t\t\t\tsessionStateSnapshot: this.$sessionStateSnapshot.get(),\n\t\t\t\t})\n\t\t\t} else {\n\t\t\t\tconst diffs = squashRecordDiffs(\n\t\t\t\t\tdiffQueue.filter((d): d is RecordsDiff<UnknownRecord> => d !== UPDATE_INSTANCE_STATE)\n\t\t\t\t)\n\t\t\t\tawait this.db.storeChanges({\n\t\t\t\t\tchanges: diffs,\n\t\t\t\t\tschema: this.store.schema,\n\t\t\t\t\tsessionId: this.sessionId,\n\t\t\t\t\tsessionStateSnapshot: this.$sessionStateSnapshot.get(),\n\t\t\t\t})\n\t\t\t}\n\t\t\tthis.didLastWriteError = false\n\t\t} catch (e) {\n\t\t\t// set this.shouldDoFullDBWrite because we clear the diffQueue no matter what,\n\t\t\t// so if this is just a temporary error, we will still persist all changes\n\t\t\tthis.shouldDoFullDBWrite = true\n\t\t\tthis.didLastWriteError = true\n\t\t\tconsole.error('failed to store changes in indexed db', e)\n\n\t\t\tshowCantWriteToIndexDbAlert()\n\t\t\tif (typeof window !== 'undefined') {\n\t\t\t\t// adios\n\t\t\t\twindow.location.reload()\n\t\t\t}\n\t\t}\n\n\t\tthis.isPersisting = false\n\t\tthis.debug('doPersist end')\n\n\t\t// changes might have come in between when we started the persist and\n\t\t// now. we request another persist so any new changes can get written\n\t\tthis.schedulePersist()\n\t}\n}\n"],
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