@tanstack/db
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A reactive client store for building super fast apps on sync
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{"version":3,"file":"collection-subscriber.cjs","sources":["../../../../src/query/live/collection-subscriber.ts"],"sourcesContent":["import { normalizeExpressionPaths } from '../compiler/expressions.js'\nimport { OrderedSourceLoader } from './ordered-source-loader.js'\nimport {\n computeSubscriptionOrderByHints,\n reconcileChangesForD2,\n sendChangesToInput,\n splitUpdates,\n} from './utils.js'\nimport { SubsetDemandController } from './subset-demand-controller.js'\nimport type { Collection } from '../../collection/index.js'\nimport type {\n ChangeMessage,\n LoadSubsetRequestResult,\n SubscribeChangesOptions,\n SubscriptionLoadSubsetErrorEvent,\n SubscriptionStatusChangeEvent,\n} from '../../types.js'\nimport type { Context, GetResult } from '../builder/types.js'\nimport type { BasicExpression } from '../ir.js'\nimport type { OrderByOptimizationInfo } from '../compiler/order-by.js'\nimport type { CollectionConfigBuilder } from './collection-config-builder.js'\nimport type { CollectionSubscription } from '../../collection/subscription.js'\nimport type { LazyDemandPlan } from '../compiler/joins.js'\n\nconst loadMoreCallbackSymbol = Symbol.for(\n `@tanstack/db.collection-config-builder`,\n)\n\ntype TruncateReplayPublicationControl = NonNullable<\n SubscribeChangesOptions[`truncateReplayPublication`]\n>\n\nexport class CollectionSubscriber<\n TContext extends Context,\n TResult extends object = GetResult<TContext>,\n> {\n // Track deferred promises for subscription loading states\n private subscriptionLoadingPromises = new Map<\n CollectionSubscription,\n { resolve: () => void }\n >()\n\n // Exact row last contributed to D2 for each source key.\n private sentToD2Rows = new Map<string | number, Record<string, unknown>>()\n\n // Direct load tracking callback for ordered path (set during subscribeToOrderedChanges,\n // used by loadNextItems for subsequent requestLimitedSnapshot calls)\n private orderedLoader: OrderedSourceLoader | undefined\n private readonly demand = new SubsetDemandController()\n\n constructor(\n private sourceId: string,\n private alias: string,\n private collection: Collection,\n private collectionConfigBuilder: CollectionConfigBuilder<TContext, TResult>,\n ) {}\n\n subscribe(): CollectionSubscription {\n const whereClause = this.getWhereClause()\n\n if (whereClause) {\n const whereExpression = normalizeExpressionPaths(whereClause, this.alias)\n return this.subscribeToChanges(whereExpression)\n }\n\n return this.subscribeToChanges()\n }\n\n private subscribeToChanges(whereExpression?: BasicExpression<boolean>) {\n const orderByInfo = this.getOrderByInfo()\n\n // Direct load promise tracking: pipes loadSubset results straight to the\n // live query collection, avoiding the multi-hop deferred promise chain that\n // can break under microtask timing (e.g., queueMicrotask in TanStack Query).\n const trackLoadResult = (result: LoadSubsetRequestResult) => {\n if (result instanceof Promise) {\n // Defer the tracked rejection by one microtask so the subscription's\n // error event can put an initial live query in error before loading\n // state would otherwise let it become ready.\n const trackedResult = result.catch(async (error: unknown) => {\n await Promise.resolve()\n throw error\n })\n this.collectionConfigBuilder.trackSubsetLoadPromise(trackedResult)\n }\n }\n\n // Status change handler - passed to subscribeChanges so it's registered\n // BEFORE any snapshot is requested, preventing race conditions.\n // Used as a fallback for status transitions not covered by direct tracking\n // (e.g., truncate-triggered reloads that call trackLoadSubsetPromise directly).\n const onStatusChange = (event: SubscriptionStatusChangeEvent) => {\n if (this.collectionConfigBuilder.isLazySource(this.sourceId)) return\n const subscription = event.subscription as CollectionSubscription\n if (event.status === `loadingSubset`) {\n this.ensureLoadingPromise(subscription)\n } else {\n // status is 'ready'\n const deferred = this.subscriptionLoadingPromises.get(subscription)\n if (deferred) {\n this.subscriptionLoadingPromises.delete(subscription)\n deferred.resolve()\n }\n }\n }\n const onLoadSubsetError = (event: SubscriptionLoadSubsetErrorEvent) => {\n this.collectionConfigBuilder.recordSubsetError(\n event.error,\n // Lazy demand owns its fatal-error path. For eager sources, one\n // successful page does not finish initial ordered refinement.\n !this.collectionConfigBuilder.isLazySource(this.sourceId) &&\n this.collectionConfigBuilder.liveQueryCollection?.status ===\n `loading`,\n )\n }\n\n // Create subscription with onStatusChange - listener is registered before any async work\n let subscription: CollectionSubscription\n if (orderByInfo) {\n subscription = this.subscribeToOrderedChanges(\n whereExpression,\n orderByInfo,\n onStatusChange,\n trackLoadResult,\n onLoadSubsetError,\n )\n } else {\n // Lazy sources load only the subsets demanded by the compiled graph.\n const includeInitialState =\n (this.collection.config.syncMode !== `on-demand` ||\n this.collectionConfigBuilder.query.limit !== 0) &&\n !this.collectionConfigBuilder.isLazySource(this.sourceId)\n\n subscription = this.subscribeToMatchingChanges(\n whereExpression,\n includeInitialState,\n onStatusChange,\n trackLoadResult,\n onLoadSubsetError,\n )\n this.registerSubscriptionCleanup(subscription)\n }\n\n // Check current status after subscribing - if status is 'loadingSubset', track it.\n // The onStatusChange listener will catch the transition to 'ready'.\n if (\n !this.collectionConfigBuilder.isLazySource(this.sourceId) &&\n subscription.status === `loadingSubset`\n ) {\n this.ensureLoadingPromise(subscription)\n }\n\n return subscription\n }\n\n private registerSubscriptionCleanup(\n subscription: CollectionSubscription,\n ): void {\n const unsubscribe = () => {\n // If subscription has a pending promise, resolve it before unsubscribing\n const deferred = this.subscriptionLoadingPromises.get(subscription)\n if (deferred) {\n this.subscriptionLoadingPromises.delete(subscription)\n deferred.resolve()\n }\n\n try {\n this.demand.clear()\n } finally {\n subscription.unsubscribe()\n }\n }\n // currentSyncState is always defined when subscribe() is called\n // (called during sync session setup)\n this.collectionConfigBuilder.currentSyncState!.unsubscribeCallbacks.add(\n unsubscribe,\n )\n }\n\n setDemand(\n subscription: CollectionSubscription,\n plan: LazyDemandPlan,\n keys: Set<unknown>,\n ): void {\n let update\n try {\n update = this.demand.setDemand(subscription, plan, keys)\n } catch (error) {\n // CollectionSubscription reports adapter failures before rethrowing.\n // Convert that synchronous form to the same query-local fatal demand\n // state as a rejected load, without letting it escape the source commit.\n // Preserve unrelated graph/programming errors as throws.\n if (!Object.is(subscription.lastError, error)) throw error\n const isInitialSync =\n this.collectionConfigBuilder.liveQueryCollection?.status === `loading`\n const generation = this.collectionConfigBuilder.beginDemand(plan.id)\n this.collectionConfigBuilder.failDemand(plan.id, generation, error)\n if (isInitialSync) throw error\n return\n }\n if (!update.changed) return\n\n if (update.empty) {\n this.collectionConfigBuilder.retireDemand(plan.id)\n return\n }\n\n const generation = this.collectionConfigBuilder.beginDemand(plan.id)\n if (update.ready instanceof Promise) {\n this.collectionConfigBuilder.trackSubsetLoadOperationPromise(update.ready)\n void update.ready.then(\n () => this.collectionConfigBuilder.settleDemand(plan.id, generation),\n (error) =>\n this.collectionConfigBuilder.failDemand(plan.id, generation, error),\n )\n } else {\n this.collectionConfigBuilder.settleDemand(plan.id, generation)\n }\n }\n\n private sendChangesToPipeline(\n changes: Iterable<ChangeMessage<any, string | number>>,\n callback?: () => void,\n ) {\n const changesArray = Array.isArray(changes) ? changes : [...changes]\n const reconciledChanges = reconcileChangesForD2(\n changesArray,\n this.sentToD2Rows,\n )\n // currentSyncState and input are always defined when this method is called\n // (only called from active subscriptions during a sync session)\n const input =\n this.collectionConfigBuilder.currentSyncState!.inputs[this.sourceId]!\n const sentChanges = sendChangesToInput(input, reconciledChanges)\n\n // Do not provide the callback that loads more data\n // if there's no more data to load\n // otherwise we end up in an infinite loop trying to load more data\n const dataLoader = sentChanges > 0 ? callback : undefined\n\n // We need to schedule a graph run even if there's no data to load\n // because we need to mark the collection as ready if it's not already\n // and that's only done in `scheduleGraphRun`\n this.collectionConfigBuilder.scheduleGraphRun(dataLoader)\n }\n\n private subscribeToMatchingChanges(\n whereExpression: BasicExpression<boolean> | undefined,\n includeInitialState: boolean,\n onStatusChange: (event: SubscriptionStatusChangeEvent) => void,\n onLoadSubsetResult: (result: LoadSubsetRequestResult) => void,\n onLoadSubsetError: (event: SubscriptionLoadSubsetErrorEvent) => void,\n ): CollectionSubscription {\n const sendChanges = (\n changes: Array<ChangeMessage<any, string | number>>,\n ) => {\n this.sendChangesToPipeline(changes)\n }\n\n // Get the query's orderBy and limit to pass to loadSubset.\n const hints = computeSubscriptionOrderByHints(\n this.collectionConfigBuilder.query,\n this.alias,\n )\n\n // Track loading via the loadSubset promise directly.\n // requestSnapshot uses trackLoadSubsetPromise: false (needed for truncate handling),\n // so we use onLoadSubsetResult to get the promise and track it ourselves.\n const subscription = this.collection.subscribeChanges(sendChanges, {\n ...(includeInitialState && { includeInitialState }),\n whereExpression,\n onStatusChange,\n onLoadSubsetError,\n truncateReplayPublication: this.truncateReplayPublicationControl(),\n orderBy: hints.orderBy,\n limit: hints.limit,\n onLoadSubsetResult: includeInitialState ? onLoadSubsetResult : undefined,\n })\n\n return subscription\n }\n\n private subscribeToOrderedChanges(\n whereExpression: BasicExpression<boolean> | undefined,\n orderByInfo: OrderByOptimizationInfo,\n onStatusChange: (event: SubscriptionStatusChangeEvent) => void,\n onLoadSubsetResult: (result: LoadSubsetRequestResult) => void,\n onLoadSubsetError: (event: SubscriptionLoadSubsetErrorEvent) => void,\n ): CollectionSubscription {\n // Use a holder to forward-reference subscription in the callback\n const subscriptionHolder: { current?: CollectionSubscription } = {}\n\n const sendChangesInRange = (\n changes: Iterable<ChangeMessage<any, string | number>>,\n ) => {\n const subscription = subscriptionHolder.current\n if (!subscription) return\n const changesArray = Array.isArray(changes) ? changes : [...changes]\n\n this.orderedLoader?.onSourceChanges(changesArray, this.sentToD2Rows)\n\n // Split live updates into a delete of the old value and an insert of the new value\n const splittedChanges = splitUpdates(changesArray)\n this.sendChangesToPipelineWithTracking(splittedChanges, subscription)\n }\n\n // Subscribe to changes with onStatusChange - listener is registered before any snapshot\n // values bigger than what we've sent don't need to be sent because they can't affect the topK\n const subscription = this.collection.subscribeChanges(sendChangesInRange, {\n whereExpression,\n onStatusChange,\n onLoadSubsetError,\n truncateReplayPublication: this.truncateReplayPublicationControl(() => {\n // Recovery favors a simple, authoritative rebuild over resuming a\n // fragile cursor. The retained full-source demand is replayed on later\n // truncates, so this adds at most one demand per subscription.\n // Queue startup inside the publication barrier too: a synchronous\n // throw establishes no acquisition for the replay to wait on.\n const loader = this.orderedLoader\n this.collectionConfigBuilder.trackOrderedLoadPromise(\n Promise.resolve().then(() => loader?.loadFullSource()),\n true,\n )\n }),\n })\n subscriptionHolder.current = subscription\n this.registerSubscriptionCleanup(subscription)\n\n // Reset ordered-load state on truncate. Keep exact D2 rows until the\n // replacement publication retracts or replaces them.\n const truncateUnsubscribe = this.collection.on(`truncate`, () => {\n this.orderedLoader?.resetCursor()\n })\n\n // Clean up truncate listener when subscription is unsubscribed\n subscription.on(`unsubscribed`, () => {\n truncateUnsubscribe()\n subscriptionHolder.current = undefined\n this.orderedLoader?.dispose()\n this.orderedLoader = undefined\n })\n\n this.orderedLoader = new OrderedSourceLoader(\n orderByInfo,\n subscription,\n this.alias,\n (result, holdPublication) => {\n if (result instanceof Promise) {\n this.collectionConfigBuilder.trackOrderedLoadPromise(\n result,\n holdPublication && !subscription.hasPendingTruncateReplacement,\n )\n }\n onLoadSubsetResult(result)\n },\n )\n this.orderedLoader.start()\n\n return subscription\n }\n\n private truncateReplayPublicationControl(\n onStart?: () => void,\n ): TruncateReplayPublicationControl {\n const syncSession = this.collectionConfigBuilder.getSyncSession()\n return {\n start: () => {\n onStart?.()\n },\n succeed: () => {\n if (syncSession !== this.collectionConfigBuilder.getSyncSession()) {\n return\n }\n this.orderedLoader?.settleFullSourceReplay()\n this.collectionConfigBuilder.scheduleGraphRunForSession(syncSession)\n },\n }\n }\n\n // This function is called by maybeRunGraph\n // after each iteration of the query pipeline\n // to ensure that the orderBy operator has enough data to work with\n loadMoreIfNeeded(subscription: CollectionSubscription): void {\n if (\n subscription.hasPendingTruncateReplacement &&\n !this.collectionConfigBuilder.hasActiveWindowOperation()\n ) {\n return\n }\n\n const orderByInfo = this.getOrderByInfo()\n\n if (!orderByInfo) {\n // This query has no orderBy operator\n // so there's no data to load\n return\n }\n\n try {\n const pending = this.orderedLoader?.loadMore(\n this.collectionConfigBuilder.getActiveWindowOperationGeneration(),\n )\n if (pending) {\n this.collectionConfigBuilder.trackSubsetLoadOperationPromise(pending)\n }\n } catch (error) {\n if (!Object.is(subscription.lastError, error)) throw error\n }\n }\n\n private sendChangesToPipelineWithTracking(\n changes: Iterable<ChangeMessage<any, string | number>>,\n subscription: CollectionSubscription,\n ) {\n const orderByInfo = this.getOrderByInfo()\n if (!orderByInfo) {\n this.sendChangesToPipeline(changes)\n return\n }\n\n // Cache the loadMoreIfNeeded callback on the subscription using a symbol property.\n // This ensures we pass the same function instance to the scheduler each time,\n // allowing it to deduplicate callbacks when multiple changes arrive during a transaction.\n type SubscriptionWithLoader = CollectionSubscription & {\n [loadMoreCallbackSymbol]?: () => void\n }\n\n const subscriptionWithLoader = subscription as SubscriptionWithLoader\n\n subscriptionWithLoader[loadMoreCallbackSymbol] ??=\n this.loadMoreIfNeeded.bind(this, subscription)\n\n this.sendChangesToPipeline(\n changes,\n subscriptionWithLoader[loadMoreCallbackSymbol],\n )\n }\n\n private getWhereClause(): BasicExpression<boolean> | undefined {\n const sourceWhereClausesCache =\n this.collectionConfigBuilder.sourceWhereClausesCache\n if (!sourceWhereClausesCache) {\n return undefined\n }\n return sourceWhereClausesCache.get(this.sourceId)\n }\n\n private getOrderByInfo(): OrderByOptimizationInfo | undefined {\n const info =\n this.collectionConfigBuilder.optimizableOrderByCollections[this.sourceId]\n if (info?.sourceId === this.sourceId) {\n return info\n }\n return undefined\n }\n\n private ensureLoadingPromise(subscription: CollectionSubscription) {\n if (this.subscriptionLoadingPromises.has(subscription)) {\n return\n }\n\n let resolve: () => void\n const promise = new Promise<void>((res) => {\n resolve = res\n })\n\n this.subscriptionLoadingPromises.set(subscription, {\n resolve: resolve!,\n })\n this.collectionConfigBuilder.trackSubsetLoadPromise(promise)\n 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