564 lines
18 KiB
TypeScript
564 lines
18 KiB
TypeScript
import path from 'path';
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import { Op, Transactionable } from '@tachybase/database';
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import { Logger, LoggerOptions } from '@tachybase/logger';
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import Application, { Plugin, PluginOptions } from '@tachybase/server';
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import { Registry } from '@tachybase/utils';
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import LRUCache from 'lru-cache';
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import initActions from './actions';
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import { EXECUTION_STATUS } from './constants';
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import { PluginActionTrigger } from './features/action-trigger/Plugin';
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import { PluginAggregate } from './features/aggregate/Plugin';
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import PluginWorkflowAPIRegularServer from './features/api-regular/plugin';
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import { PluginDelay } from './features/delay/Plugin';
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import { PluginDynamicCalculation } from './features/dynamic-calculation/Plugin';
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import { PluginInterception } from './features/interception';
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import PluginWorkflowJSParseServer from './features/js-parse/plugin';
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import PluginWorkflowJSONParseServer from './features/json-parse/plugin';
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import { PluginLoop } from './features/loop/Plugin';
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import { PluginManual } from './features/manual/Plugin';
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import { PluginOmniTrigger } from './features/omni-trigger';
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import { PluginParallel } from './features/parallel/Plugin';
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import { PluginRequest } from './features/request/Plugin';
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import { PluginResponse } from './features/response';
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import { PluginSql } from './features/sql/Plugin';
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import { PluginTriggerInstruction } from './features/trigger-instruction/plugin';
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import { PluginVariables } from './features/variables';
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import initFunctions, { CustomFunction } from './functions';
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import { Instruction, InstructionInterface } from './instructions';
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import CalculationInstruction from './instructions/CalculationInstruction';
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import ConditionInstruction from './instructions/ConditionInstruction';
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import CreateInstruction from './instructions/CreateInstruction';
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import DestroyInstruction from './instructions/DestroyInstruction';
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import EndInstruction from './instructions/EndInstruction';
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import QueryInstruction from './instructions/QueryInstruction';
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import UpdateInstruction from './instructions/UpdateInstruction';
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import Processor from './Processor';
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import Trigger from './triggers';
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import CollectionTrigger from './triggers/CollectionTrigger';
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import ScheduleTrigger from './triggers/ScheduleTrigger';
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import type { ExecutionModel, JobModel, WorkflowModel } from './types';
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type ID = number | string;
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type Pending = [ExecutionModel, JobModel?];
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type CachedEvent = [WorkflowModel, any, { context?: any }];
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export default class PluginWorkflowServer extends Plugin {
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instructions: Registry<InstructionInterface> = new Registry();
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triggers: Registry<Trigger> = new Registry();
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functions: Registry<CustomFunction> = new Registry();
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enabledCache: Map<number, WorkflowModel> = new Map();
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private ready = false;
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private executing: Promise<void> | null = null;
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private pending: Pending[] = [];
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private events: CachedEvent[] = [];
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private eventsCount = 0;
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private loggerCache: LRUCache<string, Logger>;
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private meter = null;
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constructor(app: Application, options?: PluginOptions) {
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super(app, options);
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this.addFeature(PluginSql);
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this.addFeature(PluginRequest);
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this.addFeature(PluginParallel);
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this.addFeature(PluginManual);
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this.addFeature(PluginLoop);
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this.addFeature(PluginDynamicCalculation);
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this.addFeature(PluginDelay);
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this.addFeature(PluginAggregate);
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this.addFeature(PluginActionTrigger);
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this.addFeature(PluginWorkflowJSONParseServer);
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this.addFeature(PluginWorkflowJSParseServer);
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this.addFeature(PluginWorkflowAPIRegularServer);
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this.addFeature(PluginInterception);
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this.addFeature(PluginVariables);
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this.addFeature(PluginResponse);
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this.addFeature(PluginOmniTrigger);
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this.addFeature(PluginTriggerInstruction);
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}
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getLogger(workflowId: ID): Logger {
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const now = new Date();
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const date = `${now.getFullYear()}-${`0${now.getMonth() + 1}`.slice(-2)}-${`0${now.getDate()}`.slice(-2)}`;
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const key = `${date}-${workflowId}}`;
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if (this.loggerCache.has(key)) {
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return this.loggerCache.get(key);
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}
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const logger = this.createLogger({
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dirname: path.join('workflows', date),
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filename: `${workflowId}.log`,
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transports: [...(process.env.NODE_ENV !== 'production' ? ['console'] : ['file'])],
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} as LoggerOptions);
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this.loggerCache.set(key, logger);
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return logger;
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}
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isWorkflowSync(workflow: WorkflowModel) {
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const trigger = this.triggers.get(workflow.type);
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if (!trigger) {
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throw new Error(`invalid trigger type ${workflow.type} of workflow ${workflow.id}`);
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}
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return trigger.sync ?? workflow.sync;
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}
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private onBeforeSave = async (instance: WorkflowModel, options) => {
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const Model = <typeof WorkflowModel>instance.constructor;
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if (instance.enabled) {
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instance.set('current', true);
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} else if (!instance.current) {
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const count = await Model.count({
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where: {
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key: instance.key,
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},
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transaction: options.transaction,
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});
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if (!count) {
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instance.set('current', true);
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}
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}
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if (!instance.changed('enabled') || !instance.enabled) {
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return;
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}
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const previous = await Model.findOne({
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where: {
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key: instance.key,
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current: true,
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id: {
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[Op.ne]: instance.id,
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},
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},
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transaction: options.transaction,
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});
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if (previous) {
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// NOTE: set to `null` but not `false` will not violate the unique index
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await previous.update(
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{ enabled: false, current: null },
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{
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transaction: options.transaction,
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hooks: false,
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},
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);
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this.toggle(previous, false);
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}
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};
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registerTrigger<T extends Trigger>(type: string, trigger: T | { new (p: Plugin): T }) {
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if (typeof trigger === 'function') {
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this.triggers.register(type, new trigger(this));
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} else if (trigger) {
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this.triggers.register(type, trigger);
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} else {
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throw new Error('invalid trigger type to register');
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}
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}
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registerInstruction(type: string, instruction: InstructionInterface | { new (p: Plugin): InstructionInterface }) {
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if (typeof instruction === 'function') {
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this.instructions.register(type, new instruction(this));
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} else if (instruction) {
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this.instructions.register(type, instruction);
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} else {
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throw new Error('invalid instruction type to register');
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}
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}
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private initTriggers<T extends Trigger>(more: { [key: string]: T | { new (p: Plugin): T } } = {}) {
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this.registerTrigger('collection', CollectionTrigger);
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this.registerTrigger('schedule', ScheduleTrigger);
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for (const [name, trigger] of Object.entries(more)) {
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this.registerTrigger(name, trigger);
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}
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}
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private initInstructions<T extends Instruction>(more: { [key: string]: T | { new (p: Plugin): T } } = {}) {
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this.registerInstruction('calculation', CalculationInstruction);
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this.registerInstruction('condition', ConditionInstruction);
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this.registerInstruction('end', EndInstruction);
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this.registerInstruction('create', CreateInstruction);
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this.registerInstruction('destroy', DestroyInstruction);
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this.registerInstruction('query', QueryInstruction);
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this.registerInstruction('update', UpdateInstruction);
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for (const [name, instruction] of Object.entries({ ...more })) {
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this.registerInstruction(name, instruction);
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}
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}
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async load() {
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const { db, options } = this;
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initActions(this);
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this.initTriggers(options.triggers);
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this.initInstructions(options.instructions);
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initFunctions(this, options.functions);
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this.loggerCache = new LRUCache({
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max: 20,
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updateAgeOnGet: true,
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dispose(logger) {
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(<Logger>logger).end();
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},
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});
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this.meter = this.app.telemetry.metric.getMeter();
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const counter = this.meter.createObservableGauge('workflow.events.counter');
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counter.addCallback((result) => {
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result.observe(this.eventsCount);
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});
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this.app.acl.registerSnippet({
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name: `pm.${this.name}.workflows`,
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actions: [
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'workflows:*',
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'workflows.nodes:*',
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'executions:list',
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'executions:get',
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'executions:cancel',
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'flow_nodes:update',
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'flow_nodes:destroy',
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],
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});
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this.app.acl.registerSnippet({
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name: 'ui.*',
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actions: ['workflows:list'],
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});
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this.app.acl.allow('workflows', ['trigger'], 'loggedIn');
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await this.importCollections(path.resolve(__dirname, 'collections'));
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this.db.addMigrations({
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namespace: this.name,
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directory: path.resolve(__dirname, 'migrations'),
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context: {
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plugin: this,
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},
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});
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db.on('workflows.beforeSave', this.onBeforeSave);
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db.on('workflows.afterSave', (model: WorkflowModel) => this.toggle(model));
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db.on('workflows.afterDestroy', (model: WorkflowModel) => this.toggle(model, false));
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// [Life Cycle]:
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// * load all workflows in db
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// * add all hooks for enabled workflows
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// * add hooks for create/update[enabled]/delete workflow to add/remove specific hooks
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this.app.on('beforeStart', async () => {
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const collection = db.getCollection('workflows');
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const workflows = await collection.repository.find({
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filter: { enabled: true },
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});
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workflows.forEach((workflow: WorkflowModel) => {
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this.toggle(workflow);
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});
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});
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this.app.on('afterStart', () => {
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this.app.setMaintainingMessage('check for not started executions');
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this.ready = true;
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// check for not started executions
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this.dispatch();
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});
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this.app.on('beforeStop', async () => {
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const repository = db.getRepository('workflows');
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const workflows = await repository.find({
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filter: { enabled: true },
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});
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workflows.forEach((workflow: WorkflowModel) => {
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this.toggle(workflow, false);
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});
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this.ready = false;
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if (this.events.length) {
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await this.prepare();
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}
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if (this.executing) {
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await this.executing;
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}
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});
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}
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toggle(workflow: WorkflowModel, enable?: boolean) {
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const type = workflow.get('type');
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const trigger = this.triggers.get(type);
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if (!trigger) {
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this.getLogger(workflow.id).error(`trigger type ${workflow.type} of workflow ${workflow.id} is not implemented`);
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return;
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}
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if (enable ?? workflow.get('enabled')) {
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// NOTE: remove previous listener if config updated
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const prev = workflow.previous();
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if (prev.config) {
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trigger.off({ ...workflow.get(), ...prev });
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}
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trigger.on(workflow);
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this.enabledCache.set(workflow.id, workflow);
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} else {
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trigger.off(workflow);
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this.enabledCache.delete(workflow.id);
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}
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}
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public trigger(
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workflow: WorkflowModel,
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context: object,
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options: { [key: string]: any } & Transactionable = {},
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): void | Promise<Processor | null> {
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const logger = this.getLogger(workflow.id);
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if (!this.ready) {
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logger.warn(`app is not ready, event of workflow ${workflow.id} will be ignored`);
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logger.debug(`ignored event data:`, context);
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return;
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}
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// `null` means not to trigger
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if (context == null) {
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logger.warn(`workflow ${workflow.id} event data context is null, event will be ignored`);
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return;
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}
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if (this.isWorkflowSync(workflow)) {
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return this.triggerSync(workflow, context, options);
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}
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const { transaction, ...rest } = options;
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this.events.push([workflow, context, rest]);
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this.eventsCount = this.events.length;
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logger.info(`new event triggered, now events: ${this.events.length}`);
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logger.debug(`event data:`, { context });
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if (this.events.length > 1) {
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return;
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}
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// NOTE: no await for quick return
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setTimeout(this.prepare);
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}
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private async triggerSync(
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workflow: WorkflowModel,
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context: object,
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options: { [key: string]: any } & Transactionable = {},
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): Promise<Processor | null> {
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let execution;
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try {
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execution = await this.createExecution(workflow, context, options);
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} catch (err) {
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this.getLogger(workflow.id).error(`creating execution failed: ${err.message}`, err);
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return null;
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}
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try {
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return this.process(execution, null, options);
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} catch (err) {
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this.getLogger(execution.workflowId).error(`execution (${execution.id}) error: ${err.message}`, err);
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}
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return null;
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}
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public async resume(job) {
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if (!job.execution) {
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job.execution = await job.getExecution();
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}
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this.getLogger(job.execution.workflowId).info(
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`execution (${job.execution.id}) resuming from job (${job.id}) added to pending list`,
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);
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this.pending.push([job.execution, job]);
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this.dispatch();
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}
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public createProcessor(execution: ExecutionModel, options = {}): Processor {
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return new Processor(execution, { ...options, plugin: this });
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}
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private async createExecution(workflow: WorkflowModel, context, options): Promise<ExecutionModel | null> {
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const { transaction = await this.db.sequelize.transaction() } = options;
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const trigger = this.triggers.get(workflow.type);
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const valid = await trigger.validateEvent(workflow, context, { ...options, transaction });
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if (!valid) {
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if (!options.transaction) {
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await transaction.commit();
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}
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return null;
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}
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const execution = await workflow.createExecution(
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{
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context,
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key: workflow.key,
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status: EXECUTION_STATUS.QUEUEING,
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},
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{ transaction },
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);
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this.getLogger(workflow.id).info(`execution of workflow ${workflow.id} created as ${execution.id}`);
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await workflow.increment(['executed', 'allExecuted'], { transaction });
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// NOTE: https://sequelize.org/api/v6/class/src/model.js~model#instance-method-increment
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if (this.db.options.dialect !== 'postgres') {
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await workflow.reload({ transaction });
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}
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await (<typeof WorkflowModel>workflow.constructor).update(
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{
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allExecuted: workflow.allExecuted,
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},
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{
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where: {
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key: workflow.key,
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},
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transaction,
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},
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);
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if (!options.transaction) {
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await transaction.commit();
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}
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execution.workflow = workflow;
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return execution;
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}
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private prepare = async () => {
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if (this.executing && this.db.options.dialect === 'sqlite') {
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await this.executing;
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}
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const event = this.events.shift();
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this.eventsCount = this.events.length;
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if (!event) {
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this.getLogger('dispatcher').warn(`events queue is empty, no need to prepare`);
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return;
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}
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const logger = this.getLogger(event[0].id);
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logger.info(`preparing execution for event`);
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try {
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const execution = await this.createExecution(...event);
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// NOTE: cache first execution for most cases
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if (execution && !this.executing && !this.pending.length) {
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this.pending.push([execution]);
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}
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} catch (err) {
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logger.error(`failed to create execution: ${err.message}`, err);
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// this.events.push(event); // NOTE: retry will cause infinite loop
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}
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if (this.events.length) {
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await this.prepare();
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} else {
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this.dispatch();
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}
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};
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private dispatch() {
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if (!this.ready) {
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this.getLogger('dispatcher').warn(`app is not ready, new dispatching will be ignored`);
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return;
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}
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if (this.executing) {
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this.getLogger('dispatcher').warn(`workflow executing is not finished, new dispatching will be ignored`);
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return;
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}
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if (this.events.length) {
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return this.prepare();
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}
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this.executing = (async () => {
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let next: Pending | null = null;
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// resuming has high priority
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if (this.pending.length) {
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next = this.pending.shift() as Pending;
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this.getLogger(next[0].workflowId).info(`pending execution (${next[0].id}) ready to process`);
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} else {
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const execution = (await this.db.getRepository('executions').findOne({
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filter: {
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status: EXECUTION_STATUS.QUEUEING,
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'workflow.enabled': true,
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'workflow.id': {
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[Op.not]: null,
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},
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},
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appends: ['workflow'],
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sort: 'createdAt',
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})) as ExecutionModel;
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if (execution) {
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this.getLogger(execution.workflowId).info(`execution (${execution.id}) fetched from db`);
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next = [execution];
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}
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}
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if (next) {
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await this.process(...next);
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}
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this.executing = null;
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if (next) {
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this.dispatch();
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}
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})();
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}
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private async process(execution: ExecutionModel, job?: JobModel, options: Transactionable = {}): Promise<Processor> {
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if (execution.status === EXECUTION_STATUS.QUEUEING) {
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await execution.update({ status: EXECUTION_STATUS.STARTED }, { transaction: options.transaction });
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}
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const logger = this.getLogger(execution.workflowId);
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const processor = this.createProcessor(execution, options);
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logger.info(`execution (${execution.id}) ${job ? 'resuming' : 'starting'}...`);
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// this.emit('beforeProcess', processor);
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try {
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|
await (job ? processor.resume(job) : processor.start());
|
|
logger.info(`execution (${execution.id}) finished with status: ${execution.status}`, { execution });
|
|
if (execution.status && execution.workflow.options?.deleteExecutionOnStatus?.includes(execution.status)) {
|
|
await execution.destroy();
|
|
}
|
|
} catch (err) {
|
|
logger.error(`execution (${execution.id}) error: ${err.message}`, err);
|
|
}
|
|
|
|
// this.emit('afterProcess', processor);
|
|
|
|
return processor;
|
|
}
|
|
|
|
useDataSourceTransaction(dataSourceName = 'main', transaction, create = false) {
|
|
// @ts-ignore
|
|
const { db } = this.app.dataSourceManager.dataSources.get(dataSourceName).collectionManager;
|
|
if (!db) {
|
|
return;
|
|
}
|
|
if (db.sequelize === transaction?.sequelize) {
|
|
return transaction;
|
|
}
|
|
if (create) {
|
|
return db.sequelize.transaction();
|
|
}
|
|
}
|
|
}
|