tachybase_todo/packages/plugins/workflow/src/server/Plugin.ts

356 lines
9.7 KiB
TypeScript

import path from 'path';
import winston from 'winston';
import LRUCache from 'lru-cache';
import { Op } from '@nocobase/database';
import { Plugin } from '@nocobase/server';
import { Registry } from '@nocobase/utils';
import initFields from './fields';
import initActions from './actions';
import { EXECUTION_STATUS } from './constants';
import initInstructions, { Instruction } from './instructions';
import Processor from './Processor';
import initTriggers, { Trigger } from './triggers';
import initFunctions, { CustomFunction } from './functions';
import { createLogger, Logger, LoggerOptions, getLoggerLevel, getLoggerFilePath } from '@nocobase/logger';
import type { WorkflowModel, ExecutionModel, JobModel } from './types';
type Pending = [ExecutionModel, JobModel?];
type ID = number | string;
export default class WorkflowPlugin extends Plugin {
instructions: Registry<Instruction> = new Registry();
triggers: Registry<Trigger> = new Registry();
functions: Registry<CustomFunction> = new Registry();
private executing = false;
private pending: Pending[] = [];
private events: [WorkflowModel, any, { context?: any }][] = [];
private loggerCache: LRUCache<string, Logger>;
getLogger(workflowId: ID): Logger {
const now = new Date();
const date = `${now.getFullYear()}-${`0${now.getMonth() + 1}`.slice(-2)}-${`0${now.getDate()}`.slice(-2)}`;
const key = `${date}-${workflowId}}`;
if (this.loggerCache.has(key)) {
return this.loggerCache.get(key);
}
const logger = createLogger({
transports: [
'console',
new winston.transports.File({
filename: getLoggerFilePath('workflows', date, `${workflowId}.log`),
level: getLoggerLevel(),
}),
],
} as LoggerOptions);
this.loggerCache.set(key, logger);
return logger;
}
onBeforeSave = async (instance: WorkflowModel, options) => {
const Model = <typeof WorkflowModel>instance.constructor;
if (instance.enabled) {
instance.set('current', true);
} else if (!instance.current) {
const count = await Model.count({
where: {
key: instance.key,
},
transaction: options.transaction,
});
if (!count) {
instance.set('current', true);
}
}
if (!instance.changed('enabled') || !instance.enabled) {
return;
}
const previous = await Model.findOne({
where: {
key: instance.key,
current: true,
id: {
[Op.ne]: instance.id,
},
},
transaction: options.transaction,
});
if (previous) {
// NOTE: set to `null` but not `false` will not violate the unique index
await previous.update(
{ enabled: false, current: null },
{
transaction: options.transaction,
hooks: false,
},
);
this.toggle(previous, false);
}
};
async load() {
const { db, options } = this;
initFields(this);
initActions(this);
initTriggers(this, options.triggers);
initInstructions(this, options.instructions);
initFunctions(this, options.functions);
this.loggerCache = new LRUCache({
max: 20,
updateAgeOnGet: true,
dispose(logger) {
(<Logger>logger).end();
},
});
this.app.acl.registerSnippet({
name: `pm.${this.name}.workflows`,
actions: [
'workflows:*',
'workflows.nodes:*',
'executions:list',
'executions:get',
'flow_nodes:update',
'flow_nodes:destroy',
],
});
this.app.acl.allow('users_jobs', ['list', 'get', 'submit'], 'loggedIn');
await db.import({
directory: path.resolve(__dirname, 'collections'),
});
this.db.addMigrations({
namespace: 'workflow',
directory: path.resolve(__dirname, 'migrations'),
context: {
plugin: this,
},
});
db.on('workflows.beforeSave', this.onBeforeSave);
db.on('workflows.afterSave', (model: WorkflowModel) => this.toggle(model));
db.on('workflows.afterDestroy', (model: WorkflowModel) => this.toggle(model, false));
// [Life Cycle]:
// * load all workflows in db
// * add all hooks for enabled workflows
// * add hooks for create/update[enabled]/delete workflow to add/remove specific hooks
this.app.on('beforeStart', async () => {
const collection = db.getCollection('workflows');
const workflows = await collection.repository.find({
filter: { enabled: true },
});
workflows.forEach((workflow: WorkflowModel) => {
this.toggle(workflow);
});
});
this.app.on('afterStart', () => {
// check for not started executions
this.dispatch();
});
this.app.on('beforeStop', async () => {
const collection = db.getCollection('workflows');
const workflows = await collection.repository.find({
filter: { enabled: true },
});
workflows.forEach((workflow: WorkflowModel) => {
this.toggle(workflow, false);
});
});
}
toggle(workflow: WorkflowModel, enable?: boolean) {
const type = workflow.get('type');
const trigger = this.triggers.get(type);
if (typeof enable !== 'undefined' ? enable : workflow.get('enabled')) {
// NOTE: remove previous listener if config updated
const prev = workflow.previous();
if (prev.config) {
trigger.off({ ...workflow.get(), ...prev });
}
trigger.on(workflow);
} else {
trigger.off(workflow);
}
}
public trigger(workflow: WorkflowModel, context: { [key: string]: any }, options: { context?: any } = {}): void {
// `null` means not to trigger
if (context == null) {
return;
}
this.events.push([workflow, context, options]);
this.getLogger(workflow.id).info(`new event triggered, now events: ${this.events.length}`);
this.getLogger(workflow.id).debug(`event data:`, {
data: context,
});
if (this.events.length > 1) {
return;
}
// NOTE: no await for quick return
setTimeout(this.prepare);
}
private prepare = async () => {
const [event] = this.events;
if (!event) {
return;
}
const [workflow, context, options] = event;
let valid = true;
if (options.context?.executionId) {
// NOTE: no transaction here for read-uncommitted execution
const existed = await workflow.countExecutions({
where: {
id: options.context.executionId,
},
});
if (existed) {
this.getLogger(workflow.id).warn(
`workflow ${workflow.id} has already been triggered in same execution (${options.context.executionId}), and newly triggering will be skipped.`,
);
valid = false;
}
}
if (valid) {
const execution = await this.db.sequelize.transaction(async (transaction) => {
const execution = await workflow.createExecution(
{
context,
key: workflow.key,
status: EXECUTION_STATUS.QUEUEING,
useTransaction: workflow.useTransaction,
},
{ transaction },
);
await workflow.increment('executed', { transaction });
await (<typeof WorkflowModel>workflow.constructor).increment('allExecuted', {
where: {
key: workflow.key,
},
transaction,
});
execution.workflow = workflow;
return execution;
});
this.getLogger(workflow.id).debug(`execution of workflow ${workflow.id} created as ${execution.id}`, {
data: execution.context,
});
// NOTE: cache first execution for most cases
if (!this.executing && !this.pending.length) {
this.pending.push([execution]);
}
}
this.events.shift();
if (this.events.length) {
await this.prepare();
} else {
this.dispatch();
}
};
public async resume(job) {
if (!job.execution) {
job.execution = await job.getExecution();
}
this.pending.push([job.execution, job]);
this.dispatch();
}
private async dispatch() {
if (this.executing) {
return;
}
this.executing = true;
let next: Pending | null = null;
// resuming has high priority
if (this.pending.length) {
next = this.pending.shift() as Pending;
this.getLogger(next[0].workflowId).info(`pending execution (${next[0].id}) ready to process`);
} else {
const execution = (await this.db.getRepository('executions').findOne({
filter: {
status: EXECUTION_STATUS.QUEUEING,
},
appends: ['workflow'],
sort: 'createdAt',
})) as ExecutionModel;
if (execution && execution.workflow.enabled) {
this.getLogger(execution.workflowId).info(`execution (${execution.id}) fetched from db`);
next = [execution];
}
}
if (next) {
await this.process(...next);
}
this.executing = false;
if (next) {
this.dispatch();
}
}
private async process(execution: ExecutionModel, job?: JobModel) {
if (execution.status === EXECUTION_STATUS.QUEUEING) {
await execution.update({ status: EXECUTION_STATUS.STARTED });
}
const processor = this.createProcessor(execution);
this.getLogger(execution.workflowId).info(`execution (${execution.id}) ${job ? 'resuming' : 'starting'}...`);
try {
await (job ? processor.resume(job) : processor.start());
this.getLogger(execution.workflowId).info(
`execution (${execution.id}) finished with status: ${execution.status}`,
);
} catch (err) {
this.getLogger(execution.workflowId).error(`execution (${execution.id}) error: ${err.message}`, err);
}
}
public createProcessor(execution: ExecutionModel, options = {}): Processor {
return new Processor(execution, { ...options, plugin: this });
}
}