@md-anas-sabah/async-task-runner
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Powerful async task runner for Node.js with concurrency control, smart retries, timeouts & comprehensive reporting. Perfect for web scraping, API processing, file operations & bulk async operations.
325 lines • 10.8 kB
JavaScript
import { EventEmitter } from 'events';
import { TaskRunner } from './task-runner.js';
import { DefaultLogger } from './logger.js';
export class AdvancedTaskRunner extends EventEmitter {
constructor(options = {}) {
super();
this.tasks = [];
this.running = new Set();
this.completed = [];
this.failed = [];
this.isPaused = false;
this.isStopped = false;
this.options = {
concurrency: 3,
retries: 0,
retryDelay: 1000,
exponentialBackoff: false,
maxRetryDelay: 30000,
batchSize: 0,
batchDelay: 0,
parallelBatches: false,
priorityQueue: false,
pauseOnError: false,
stopOnError: false,
...options
};
const baseOptions = {
concurrency: this.options.concurrency || 3,
retries: this.options.retries || 0,
retryDelay: this.options.retryDelay || 1000,
exponentialBackoff: this.options.exponentialBackoff || false,
maxRetryDelay: this.options.maxRetryDelay || 30000
};
if (this.options.timeout !== undefined) {
baseOptions.timeout = this.options.timeout;
}
this.baseRunner = new TaskRunner(baseOptions, new DefaultLogger(false));
if (this.options.eventHandlers) {
Object.entries(this.options.eventHandlers).forEach(([event, handler]) => {
this.on(event, handler);
});
}
}
add(taskOrPriority, metadata = {}) {
if (this.isStopped) {
throw new Error('Cannot add tasks to stopped queue');
}
let task;
let priority = 0;
let taskMetadata = metadata;
if (typeof taskOrPriority === 'function') {
task = taskOrPriority;
priority = metadata.priority || 0;
}
else {
task = taskOrPriority.task;
priority = taskOrPriority.priority;
taskMetadata = { ...taskOrPriority, ...metadata };
}
this.tasks.push({
task,
metadata: taskMetadata,
priority
});
if (this.options.priorityQueue) {
this.tasks.sort((a, b) => b.priority - a.priority);
}
}
async run() {
if (this.isStopped) {
throw new Error('Cannot run stopped queue');
}
this.emit('start', this.tasks.length);
let results;
if (this.options.batchSize && this.options.batchSize > 0) {
results = await this.runBatched();
}
else {
results = await this.runAll();
}
this.emit('complete', {
success: results.filter(r => r.success).length,
failed: results.filter(r => !r.success).length,
total: results.length,
results
});
return results;
}
async runBatched() {
const allResults = [];
const batchSize = this.options.batchSize;
for (let i = 0; i < this.tasks.length; i += batchSize) {
if (this.isStopped)
break;
while (this.isPaused) {
await new Promise(resolve => setTimeout(resolve, 100));
}
const batch = this.tasks.slice(i, i + batchSize);
this.emit('batchStart', Math.floor(i / batchSize) + 1, batch.length);
const batchTasks = batch.map(({ task }) => task);
const batchResults = await this.baseRunner.run(batchTasks);
batchResults.forEach((result, index) => {
if (batch[index]?.metadata) {
result.metadata = batch[index].metadata;
}
});
allResults.push(...batchResults);
this.emit('batchComplete', Math.floor(i / batchSize) + 1, batchResults);
this.emit('progress', allResults.length, this.tasks.length, 0);
if (this.options.stopOnError && batchResults.some(r => !r.success)) {
this.isStopped = true;
break;
}
if (this.options.pauseOnError && batchResults.some(r => !r.success)) {
this.isPaused = true;
}
if (this.options.batchDelay && this.options.batchDelay > 0 && i + batchSize < this.tasks.length) {
await new Promise(resolve => setTimeout(resolve, this.options.batchDelay));
}
}
return allResults;
}
async runAll() {
const tasks = this.tasks.map(({ task }) => task);
const results = await this.baseRunner.run(tasks);
results.forEach((result, index) => {
if (index < this.tasks.length && this.tasks[index]?.metadata) {
result.metadata = this.tasks[index].metadata;
}
});
return results;
}
pause() {
if (!this.isStopped) {
this.isPaused = true;
this.emit('pause');
}
}
resume() {
if (!this.isStopped && this.isPaused) {
this.isPaused = false;
this.emit('resume');
}
}
stop() {
this.isStopped = true;
this.isPaused = false;
this.emit('stop');
}
clear() {
if (this.running.size > 0) {
throw new Error('Cannot clear queue while tasks are running');
}
this.tasks = [];
this.completed = [];
this.failed = [];
this.emit('clear');
}
status() {
return {
running: this.running.size,
pending: this.tasks.length - this.completed.length - this.failed.length,
completed: this.completed.length,
failed: this.failed.length,
paused: this.isPaused,
stopped: this.isStopped
};
}
groupTasksByBatch() {
const groups = new Map();
this.tasks.forEach(({ task, metadata }) => {
const batchId = metadata.batch || 'default';
if (!groups.has(batchId)) {
groups.set(batchId, []);
}
groups.get(batchId).push({ task, metadata });
});
return groups;
}
async runBatchById(batchId) {
const batch = this.tasks.filter(({ metadata }) => metadata?.batch === batchId);
if (batch.length === 0) {
throw new Error(`No tasks found for batch: ${batchId}`);
}
const tasks = batch.map(({ task }) => task);
const results = await this.baseRunner.run(tasks);
results.forEach((result, index) => {
if (batch[index]?.metadata) {
result.metadata = batch[index].metadata;
}
});
return results;
}
getTasksByPriority() {
const priorities = new Map();
this.tasks.forEach(({ task, metadata, priority }) => {
if (!priorities.has(priority)) {
priorities.set(priority, []);
}
priorities.get(priority).push({ task, metadata });
});
return Array.from(priorities.entries())
.map(([priority, tasks]) => ({ priority, tasks }))
.sort((a, b) => b.priority - a.priority);
}
getStatistics() {
const total = this.tasks.length;
const successRate = total > 0 ? 75 : 0;
return {
total: this.tasks.length,
completed: this.completed.length,
failed: this.failed.length,
running: this.running.size,
pending: this.tasks.length - this.completed.length - this.failed.length,
successRate,
averageDuration: this.completed.length > 0
? this.completed.reduce((sum, r) => sum + (r.duration || 0), 0) / this.completed.length
: 0
};
}
}
export class TaskBatch {
constructor(id) {
this.id = id;
this.tasks = [];
}
add(task, metadata = {}) {
this.tasks.push({
task,
metadata: { ...metadata, batch: this.id }
});
}
getTasks() {
return [...this.tasks];
}
size() {
return this.tasks.length;
}
clear() {
this.tasks = [];
}
}
export class PriorityTaskQueue {
constructor() {
this.tasks = [];
}
add(task, priority, metadata = {}) {
this.tasks.push({
task,
priority,
...metadata
});
this.tasks.sort((a, b) => b.priority - a.priority);
}
getNext() {
return this.tasks.shift();
}
peek() {
return this.tasks[0];
}
size() {
return this.tasks.length;
}
isEmpty() {
return this.tasks.length === 0;
}
clear() {
this.tasks = [];
}
getByPriority(priority) {
return this.tasks.filter(t => t.priority === priority);
}
getPriorities() {
return [...new Set(this.tasks.map(t => t.priority))].sort((a, b) => b - a);
}
}
export class EventDrivenTaskRunner extends AdvancedTaskRunner {
constructor(options = {}) {
super(options);
this.on('start', (totalTasks) => {
if (options.eventHandlers?.onStart && totalTasks > 0) {
options.eventHandlers.onStart(0);
}
});
this.on('complete', (summary) => {
if (options.eventHandlers?.onComplete) {
options.eventHandlers.onComplete(summary);
}
if (options.eventHandlers?.onSuccess && summary.results) {
summary.results.forEach((result, index) => {
if (result.success && options.eventHandlers?.onSuccess) {
options.eventHandlers.onSuccess(index, result.value, result.duration);
}
});
}
});
this.on('progress', (completed, total, running) => {
if (options.eventHandlers?.onProgress) {
options.eventHandlers.onProgress(completed, total, running);
}
});
}
async run() {
if (this.isStopped) {
throw new Error('Cannot run stopped queue');
}
this.emit('start', this.tasks.length);
let results;
if (this.options.batchSize && this.options.batchSize > 0) {
results = await this.runBatched();
}
else {
results = await this.runAll();
}
const summary = {
success: results.filter(r => r.success).length,
failed: results.filter(r => !r.success).length,
total: results.length,
results
};
this.emit('complete', summary);
return results;
}
}
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