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(core) Starting to make webhooks more robust
Summary: - Puts events on a queue in memory and ensures they are sent in the order they were generated. - Makes the caller (Sharing.ts) wait until changed records have been fetched from the DB, but allows it to continue after while remaining work happens asynchronously. - Gathers all new webhook events into an array so they can be backed up to the queue on redis in a single command (in a future diff). - Uses changes in isReady to determine event type, no more 'existed before' The structure of the code has changed a lot, so I think the scope of the diff needs to stop here. Lots of work is still deferred in TODOs. Test Plan: Updated existing test. Actually dropped testing of retry on failures and slowness because it no longer made sense to keep that as part of the current test, so a new test for that will be added in a future diff. Reviewers: paulfitz Reviewed By: paulfitz Differential Revision: https://phab.getgrist.com/D3074
This commit is contained in:
Alex Hall
parent
e3801a5eb9
commit
276adc5f51
@ -4,6 +4,8 @@
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* change events.
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*/
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import { ActionSummary } from "app/common/ActionSummary";
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import { DocTriggers } from "app/server/lib/Triggers";
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import * as assert from 'assert';
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import {Mutex} from 'async-mutex';
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import * as bluebird from 'bluebird';
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@ -138,6 +140,7 @@ export class ActiveDoc extends EventEmitter {
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// result).
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protected _modificationLock: Mutex = new Mutex();
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private _triggers: DocTriggers;
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private _dataEngine: Promise<ISandbox>|undefined;
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private _activeDocImport: ActiveDocImport;
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private _onDemandActions: OnDemandActions;
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@ -168,6 +171,7 @@ export class ActiveDoc extends EventEmitter {
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this._docName = docName;
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this.docStorage = new DocStorage(docManager.storageManager, docName);
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this.docClients = new DocClients(this);
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this._triggers = new DocTriggers(this);
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this._actionHistory = new ActionHistoryImpl(this.docStorage);
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this.docPluginManager = new DocPluginManager(docManager.pluginManager.getPlugins(),
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docManager.pluginManager.appRoot!, this, this._docManager.gristServer);
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@ -288,6 +292,10 @@ export class ActiveDoc extends EventEmitter {
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return this._actionHistory;
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}
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public handleTriggers(summary: ActionSummary): Promise<void> {
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return this._triggers.handle(summary);
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}
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/**
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* Adds a client of this doc to the list of connected clients.
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* @param client: The client object maintaining the websocket connection.
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@ -319,6 +327,8 @@ export class ActiveDoc extends EventEmitter {
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this.docClients.removeAllClients();
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}
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this._triggers.shutdown();
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// Clear the MapWithTTL to remove all timers from the event loop.
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this._fetchCache.clear();
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@ -18,7 +18,6 @@ import { ActionHistory, asActionGroup, getActionUndoInfo} from './ActionHistory'
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import {summarizeAction} from "./ActionSummary";
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import {ActiveDoc} from './ActiveDoc';
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import {makeExceptionalDocSession, OptDocSession} from './DocSession';
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import {TriggersHandler} from "./Triggers";
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import {WorkCoordinator} from './WorkCoordinator';
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// Describes the request to apply a UserActionBundle. It includes a Client (so that broadcast
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@ -284,7 +283,7 @@ export class Sharing {
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await this._activeDoc.processActionBundle(ownActionBundle);
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const actionSummary = summarizeAction(localActionBundle);
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new TriggersHandler(this._activeDoc).handle(actionSummary);
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await this._activeDoc.handleTriggers(actionSummary);
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// Broadcast the action to connected browsers.
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const actionGroup = asActionGroup(this._actionHistory, localActionBundle, {
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@ -1,34 +1,32 @@
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import {ActionSummary, TableDelta} from "app/common/ActionSummary";
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import {delay} from "app/common/delay";
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import {fromTableDataAction, TableColValues} from "app/common/DocActions";
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import {StringUnion} from "app/common/StringUnion";
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import {MetaRowRecord} from "app/common/TableData";
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import {CellValue} from "app/plugin/GristData";
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import {ActiveDoc} from "app/server/lib/ActiveDoc";
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import {makeExceptionalDocSession} from "app/server/lib/DocSession";
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import * as log from "app/server/lib/log";
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import * as _ from "lodash";
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import * as LRUCache from "lru-cache";
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import fetch from "node-fetch";
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import { ActionSummary, TableDelta } from 'app/common/ActionSummary';
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import { delay } from 'app/common/delay';
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import { fromTableDataAction, RowRecord, TableColValues, TableDataAction } from 'app/common/DocActions';
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import { StringUnion } from 'app/common/StringUnion';
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import { MetaRowRecord } from 'app/common/TableData';
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import { CellDelta } from 'app/common/TabularDiff';
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import { ActiveDoc } from 'app/server/lib/ActiveDoc';
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import { makeExceptionalDocSession } from 'app/server/lib/DocSession';
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import * as log from 'app/server/lib/log';
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import { promisifyAll } from 'bluebird';
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import * as _ from 'lodash';
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import * as LRUCache from 'lru-cache';
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import fetch from 'node-fetch';
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import { createClient, RedisClient } from 'redis';
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// TODO replace with redis
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// Keeps track of whether records existed before changes to them started
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// to determine the correct event type when the record is ready
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const existedBeforeMemory: { [key: string]: boolean } = {};
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promisifyAll(RedisClient.prototype);
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// Only owners can manage triggers, but any user's activity can trigger them
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// and the corresponding actions get the full values
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const docSession = makeExceptionalDocSession('system');
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// DB cache for webhook secrets
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const webhookCache = new LRUCache<{ id: string, docId: string }, WebHookSecret>({max: 10 * 1000});
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// Describes the change in existence to a record, which determines the event type
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interface RecordDelta {
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existedBefore: boolean;
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existedAfter: boolean;
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}
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type RecordDeltas = Map<number, RecordDelta>;
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// Union discriminated by type
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type TriggerAction = WebhookAction | PythonAction;
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@ -43,10 +41,9 @@ interface PythonAction {
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code: string;
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}
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// Payload sent to webhook
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// Simply the values in a record
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interface Event {
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[colId: string]: CellValue;
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interface WebHookEvent {
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payload: RowRecord;
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id: string;
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}
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export const allowedEventTypes = StringUnion("add", "update");
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@ -60,17 +57,49 @@ export interface WebHookSecret {
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unsubscribeKey: string;
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}
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// Processes triggers for records changed as described in an ActionSummary,
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// Work to do after fetching values from the document
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interface Task {
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tableId: string;
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tableDelta: TableDelta;
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triggers: any;
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tableDataAction: Promise<TableDataAction>;
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recordDeltas: RecordDeltas;
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}
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// Processes triggers for records changed as described in ActionSummary objects,
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// initiating webhooks and automations.
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// An instance of this class should have .handle() called on it exactly once.
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export class TriggersHandler {
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export class DocTriggers {
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// Converts a column ref to colId by looking it up in _grist_Tables_column
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private _getColId: (rowId: number) => string|undefined;
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// Events that need to be sent to webhooks in FIFO order.
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private _webHookEventQueue: WebHookEvent[] = [];
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// DB cache for webhook secrets
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private _webhookCache = new LRUCache<string, WebHookSecret>({max: 1000});
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private _shuttingDown: boolean = false;
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private _sending: boolean = false;
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private _redisClient: RedisClient | undefined;
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constructor(private _activeDoc: ActiveDoc) {
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const redisUrl = process.env.REDIS_URL;
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if (redisUrl) {
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this._redisClient = createClient(redisUrl);
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// TODO check for existing events on redis queue
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}
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}
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public handle(summary: ActionSummary) {
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public shutdown() {
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this._shuttingDown = true;
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if (!this._sending) {
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this._redisClient?.quitAsync();
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}
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}
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public async handle(summary: ActionSummary) {
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const docData = this._activeDoc.docData;
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if (!docData) {
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return;
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@ -81,93 +110,156 @@ export class TriggersHandler {
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this._getColId = docData.getMetaTable("_grist_Tables_column").getMetaRowPropFunc("colId");
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const triggersByTableRef = _.groupBy(triggersTable.getRecords(), "tableRef");
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for (const [tableRef, triggers] of _.toPairs(triggersByTableRef)) {
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const tasks: Task[] = [];
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for (const tableRef of Object.keys(triggersByTableRef).sort()) {
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const triggers = triggersByTableRef[tableRef];
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const tableId = getTableId(Number(tableRef))!; // groupBy makes tableRef a string
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const tableDelta = summary.tableDeltas[tableId];
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if (!tableDelta) {
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continue; // this table was not modified by these actions
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if (tableDelta) {
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const recordDeltas = this._getRecordDeltas(tableDelta);
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const filters = {id: [...recordDeltas.keys()]};
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// Fetch the modified records in full so they can be sent in webhooks
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// They will also be used to check if the record is ready
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const tableDataAction = this._activeDoc.fetchQuery(docSession, {tableId, filters});
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tasks.push({tableId, tableDelta, triggers, tableDataAction, recordDeltas});
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}
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// Handle tables in parallel (fetching table values from document DB)
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this._handleTableTriggers(
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tableId, tableDelta, triggers
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).catch(() => log.error("Error handling triggers"));
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}
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// Fetch values from document DB in parallel
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await Promise.all(tasks.map(t => t.tableDataAction));
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const events: WebHookEvent[] = [];
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for (const task of tasks) {
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events.push(...this._handleTask(task, await task.tableDataAction));
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}
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this._webHookEventQueue.push(...events);
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if (!this._sending && events.length) {
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this._sending = true;
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const startSendLoop = () => {
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this._sendLoop().catch((e) => {
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log.error(`_sendLoop failed: ${e}`);
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startSendLoop();
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});
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};
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startSendLoop();
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}
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// TODO also push to redis queue
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}
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private async _handleTableTriggers(
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tableId: string, delta: TableDelta, triggers: Trigger[],
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) {
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private _getRecordDeltas(tableDelta: TableDelta): RecordDeltas {
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const recordDeltas = new Map<number, RecordDelta>();
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delta.updateRows.forEach(id =>
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tableDelta.updateRows.forEach(id =>
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recordDeltas.set(id, {existedBefore: true, existedAfter: true}));
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// A row ID can appear in both updateRows and addRows, although it probably shouldn't
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// Added row IDs override updated rows because they didn't exist before
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delta.addRows.forEach(id =>
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tableDelta.addRows.forEach(id =>
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recordDeltas.set(id, {existedBefore: false, existedAfter: true}));
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// If we allow subscribing to deletion in the future
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// delta.removeRows.forEach(id =>
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// recordDeltas.set(id, {existedBefore: true, existedAfter: false}));
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// Fetch the modified records in full so they can be sent in webhooks
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// They will also be used to check if the record is ready
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const filters = {id: [...recordDeltas.keys()]};
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const bulkColValues = fromTableDataAction(await this._activeDoc.fetchQuery(docSession, {tableId, filters}));
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return recordDeltas;
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}
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private _handleTask(
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{tableDelta, tableId, triggers, recordDeltas}: Task,
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tableDataAction: TableDataAction,
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) {
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const bulkColValues = fromTableDataAction(tableDataAction);
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log.info(`Processing ${triggers.length} triggers for ${bulkColValues.id.length} records of ${tableId}`);
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const makePayload = _.memoize((rowIndex: number) =>
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_.mapValues(bulkColValues, col => col[rowIndex]) as RowRecord
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);
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const result: WebHookEvent[] = [];
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for (const trigger of triggers) {
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const actions = JSON.parse(trigger.actions) as TriggerAction[];
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const webhookActions = actions.filter(act => act.type === "webhook") as WebhookAction[];
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if (!webhookActions.length) {
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continue;
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}
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for (let rowIndex = 0; rowIndex < bulkColValues.id.length; rowIndex++) {
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const rowId = bulkColValues.id[rowIndex];
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// Handle triggers serially to make order predictable
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await this._handleTrigger(
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trigger, actions, bulkColValues, rowIndex, rowId, recordDeltas.get(rowId)!
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);
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const rowIndexesToSend: number[] = _.range(bulkColValues.id.length).filter(rowIndex => {
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const rowId = bulkColValues.id[rowIndex];
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return this._shouldTriggerActions(
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trigger, bulkColValues, rowIndex, rowId, recordDeltas.get(rowId)!, tableDelta,
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);
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}
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);
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for (const action of webhookActions) {
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for (const rowIndex of rowIndexesToSend) {
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const event = {id: action.id, payload: makePayload(rowIndex)};
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result.push(event);
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}
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}
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}
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return result;
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}
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// Handles a single trigger for a single record, initiating all the corresponding actions
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private async _handleTrigger(
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trigger: Trigger, actions: TriggerAction[],
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bulkColValues: TableColValues, rowIndex: number, rowId: number, recordDelta: RecordDelta,
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) {
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let isReady: boolean;
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/**
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* Determines if actions should be triggered for a single record and trigger.
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*/
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private _shouldTriggerActions(
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trigger: Trigger,
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bulkColValues: TableColValues,
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rowIndex: number,
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rowId: number,
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recordDelta: RecordDelta,
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tableDelta: TableDelta,
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): boolean {
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let readyBefore: boolean;
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if (!trigger.isReadyColRef) {
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// User hasn't configured a column, so all records are considered ready immediately
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isReady = true;
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readyBefore = recordDelta.existedBefore;
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} else {
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const colId = this._getColId(trigger.isReadyColRef)!;
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const isReadyCellValue = bulkColValues[colId]?.[rowIndex];
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if (typeof isReadyCellValue !== "boolean") {
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// Likely causes: column not found or error in formula
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isReady = false;
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const isReadyColId = this._getColId(trigger.isReadyColRef)!;
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// Must be the actual boolean `true`, not just anything truthy
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const isReady = bulkColValues[isReadyColId][rowIndex] === true;
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if (!isReady) {
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return false;
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}
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const cellDelta: CellDelta | undefined = tableDelta.columnDeltas[isReadyColId]?.[rowId];
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if (!recordDelta.existedBefore) {
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readyBefore = false;
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} else if (!cellDelta ) {
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// Cell wasn't changed, and the record is ready now, so it was ready before.
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// This assumes that the ActionSummary contains all changes to the isReady column.
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// TODO ensure ActionSummary actually contains all changes, right now bulk changes are truncated.
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readyBefore = true;
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} else {
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isReady = isReadyCellValue;
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const deltaBefore = cellDelta[0];
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if (deltaBefore === null) {
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// The record didn't exist before, so it definitely wasn't ready
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// (although we probably shouldn't reach this since we already checked recordDelta.existedBefore)
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readyBefore = false;
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} else if (deltaBefore === "?") {
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// The ActionSummary shouldn't contain this kind of delta at all
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// since it comes from a single action bundle, not a combination of summaries.
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log.warn('Unexpected deltaBefore === "?"', {trigger, isReadyColId, rowId, docId: this._activeDoc.docName});
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readyBefore = true;
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} else {
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// Only remaining case is that deltaBefore is a single-element array containing the previous value.
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const [valueBefore] = deltaBefore;
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// Must be the actual boolean `true`, not just anything truthy
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readyBefore = valueBefore === true;
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}
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}
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}
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// Globally unique identifier of this record and trigger combination
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// trigger.tableRef is probably redundant given trigger.id, just being cautious
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const existedBeforeKey = `${this._activeDoc.docName}:${trigger.id}:${trigger.tableRef}:${rowId}`;
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// Only store existedBefore if it isn't stored already
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const existedBefore = existedBeforeKey in existedBeforeMemory ?
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existedBeforeMemory[existedBeforeKey] : recordDelta.existedBefore;
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if (!isReady) {
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existedBeforeMemory[existedBeforeKey] = existedBefore;
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return;
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}
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// Now that the record is ready, clear the stored existedBefore value
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// so that future events for this record are accurate
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delete existedBeforeMemory[existedBeforeKey];
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let eventType: EventType;
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if (existedBefore) {
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if (readyBefore) {
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eventType = "update";
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// If we allow subscribing to deletion in the future
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// if (recordDelta.existedAfter) {
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@ -178,90 +270,107 @@ export class TriggersHandler {
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} else {
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eventType = "add";
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}
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if (!trigger.eventTypes!.includes(eventType)) {
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// The user hasn't subscribed to the type of change that happened
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return trigger.eventTypes!.includes(eventType);
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}
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private async _getWebHookUrl(id: string): Promise<string | undefined> {
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let webhook = this._webhookCache.get(id);
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if (!webhook) {
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const secret = await this._activeDoc.getHomeDbManager()?.getSecret(id, this._activeDoc.docName);
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if (!secret) {
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return;
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}
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webhook = JSON.parse(secret);
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this._webhookCache.set(id, webhook!);
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}
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const url = webhook!.url;
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if (!isUrlAllowed(url)) {
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log.warn(`Webhook not sent to forbidden URL: ${url}`);
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return;
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}
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// All the values in this record
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const event = _.mapValues(bulkColValues, col => col[rowIndex]);
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// Handle actions serially to make order predictable
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for (const action of actions) {
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await this._handleTriggerAction(action, event);
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}
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return url;
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}
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private async _handleTriggerAction(action: TriggerAction, event: Event) {
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// TODO use event queue for reliability
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if (action.type === "webhook") {
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const key = {id: action.id, docId: this._activeDoc.docName};
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let webhook = webhookCache.get(key);
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if (!webhook) {
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const secret = await this._activeDoc.getHomeDbManager()?.getSecret(key.id, key.docId);
|
||||
if (!secret) {
|
||||
return;
|
||||
private async _sendLoop() {
|
||||
log.info("Starting _sendLoop");
|
||||
|
||||
// TODO delay/prevent shutting down while queue isn't empty?
|
||||
while (!this._shuttingDown) {
|
||||
if (!this._webHookEventQueue.length) {
|
||||
await delay(1000);
|
||||
continue;
|
||||
}
|
||||
const id = this._webHookEventQueue[0].id;
|
||||
const batch = _.takeWhile(this._webHookEventQueue.slice(0, 100), {id});
|
||||
const body = JSON.stringify(batch.map(e => e.payload));
|
||||
const url = await this._getWebHookUrl(id);
|
||||
let success: boolean;
|
||||
if (!url) {
|
||||
success = true;
|
||||
} else {
|
||||
success = await this._sendWebhookWithRetries(url, body);
|
||||
}
|
||||
if (success) {
|
||||
this._webHookEventQueue.splice(0, batch.length);
|
||||
// TODO also remove on redis
|
||||
} else if (!this._shuttingDown) {
|
||||
// TODO reorder queue on failure
|
||||
}
|
||||
}
|
||||
|
||||
log.info("Ended _sendLoop");
|
||||
|
||||
this._redisClient?.quitAsync().catch(e =>
|
||||
// Catch error to prevent sendLoop being restarted
|
||||
log.warn("Error quitting redis: " + e)
|
||||
);
|
||||
}
|
||||
|
||||
private async _sendWebhookWithRetries(url: string, body: string) {
|
||||
const maxAttempts = 20;
|
||||
const maxWait = 64;
|
||||
let wait = 1;
|
||||
for (let attempt = 0; attempt < maxAttempts; attempt++) {
|
||||
if (this._shuttingDown) {
|
||||
return false;
|
||||
}
|
||||
try {
|
||||
const response = await fetch(url, {
|
||||
method: 'POST',
|
||||
body,
|
||||
headers: {
|
||||
'Content-Type': 'application/json',
|
||||
},
|
||||
});
|
||||
if (response.status === 200) {
|
||||
return true;
|
||||
}
|
||||
webhook = JSON.parse(secret);
|
||||
webhookCache.set(key, webhook!);
|
||||
log.warn(`Webhook responded with status ${response.status}`);
|
||||
} catch (e) {
|
||||
log.warn(`Webhook error: ${e}`);
|
||||
}
|
||||
const url = webhook!.url;
|
||||
if (!isUrlAllowed(url)) {
|
||||
log.warn(`Webhook not sent to forbidden URL: ${url}`);
|
||||
return;
|
||||
|
||||
// Don't wait any more if this is the last attempt.
|
||||
if (attempt >= maxAttempts - 1) {
|
||||
return false;
|
||||
}
|
||||
pendingEvents.push({url: webhook!.url, event});
|
||||
if (!startedSending) {
|
||||
startedSending = true;
|
||||
setInterval(sendPendingEvents, 2000);
|
||||
|
||||
// Wait `wait` seconds, checking this._shuttingDown every second.
|
||||
for (let waitIndex = 0; waitIndex < wait; waitIndex++) {
|
||||
if (this._shuttingDown) {
|
||||
return false;
|
||||
}
|
||||
await delay(1000);
|
||||
}
|
||||
if (wait < maxWait) {
|
||||
wait *= 2;
|
||||
}
|
||||
} else {
|
||||
throw new Error("Unknown action type " + action.type);
|
||||
}
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
let pendingEvents: Array<{ url: string, event: Event }> = [];
|
||||
let startedSending = false;
|
||||
|
||||
function sendPendingEvents() {
|
||||
const pending = pendingEvents;
|
||||
pendingEvents = [];
|
||||
for (const [url, group] of _.toPairs(_.groupBy(pending, "url"))) {
|
||||
const body = JSON.stringify(_.map(group, "event"));
|
||||
sendWebhookWithRetries(url, body).catch(() => log.error("Webhook failed!"));
|
||||
}
|
||||
}
|
||||
|
||||
async function sendWebhookWithRetries(url: string, body: string) {
|
||||
const maxAttempts = 20;
|
||||
const maxWait = 64;
|
||||
let wait = 1;
|
||||
for (let i = 0; i < maxAttempts; i++) {
|
||||
try {
|
||||
const response = await fetch(url, {
|
||||
method: 'POST',
|
||||
body,
|
||||
headers: {
|
||||
'Content-Type': 'application/json',
|
||||
},
|
||||
});
|
||||
if (response.status === 200) {
|
||||
return;
|
||||
}
|
||||
log.warn(`Webhook responded with status ${response.status}`);
|
||||
} catch (e) {
|
||||
log.warn(`Webhook error: ${e}`);
|
||||
}
|
||||
await delay((wait + Math.random()) * 1000);
|
||||
if (wait < maxWait) {
|
||||
wait *= 2;
|
||||
}
|
||||
}
|
||||
throw new Error("Webhook failed!");
|
||||
}
|
||||
|
||||
|
||||
export function isUrlAllowed(urlString: string) {
|
||||
let url: URL;
|
||||
try {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user