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WorkerOutput

@webda/workout • Readme | API

Class: WorkerOutput

This class allow you to abstract the output for your program

You can sned output, ask for input and depending if you are in terminal It will show progress in the terminal, or send it via WebSockets or store it in a DB or in a logfile

Extends​

  • EventEmitter

Constructors​

new WorkerOutput(options)​

new WorkerOutput(options?): WorkerOutput

Parameters​

• options?: EventEmitterOptions

Returns​

WorkerOutput

Inherited from​

EventEmitter.constructor

Source​

node_modules/@types/node/events.d.ts:111

Properties​

currentProgress?​

currentProgress?: string

Source​

src/core.ts:214

groups​

groups: string[] = []

Source​

src/core.ts:211

inputs​

inputs: Object = {}

Index signature​

[key: string]: WorkerInputEmitter

Source​

src/core.ts:216

interactive​

interactive: boolean = false

Source​

src/core.ts:215

progresses​

progresses: Object = {}

Index signature​

[key: string]: WorkerProgress

Source​

src/core.ts:212

progressesStack​

progressesStack: string[] = []

Source​

src/core.ts:213

title?​

title?: string

Source​

src/core.ts:210

captureRejectionSymbol​

static readonly captureRejectionSymbol: typeof captureRejectionSymbol

Inherited from​

EventEmitter.captureRejectionSymbol

Source​

node_modules/@types/node/events.d.ts:328

captureRejections​

static captureRejections: boolean

Sets or gets the default captureRejection value for all emitters.

Inherited from​

EventEmitter.captureRejections

Source​

node_modules/@types/node/events.d.ts:333

defaultMaxListeners​

static defaultMaxListeners: number

Inherited from​

EventEmitter.defaultMaxListeners

Source​

node_modules/@types/node/events.d.ts:334

errorMonitor​

static readonly errorMonitor: typeof errorMonitor

This symbol shall be used to install a listener for only monitoring 'error' events. Listeners installed using this symbol are called before the regular 'error' listeners are called.

Installing a listener using this symbol does not change the behavior once an 'error' event is emitted, therefore the process will still crash if no regular 'error' listener is installed.

Inherited from​

EventEmitter.errorMonitor

Source​

node_modules/@types/node/events.d.ts:327

Methods​

addListener()​

addListener(eventName, listener): this

Alias for emitter.on(eventName, listener).

Parameters​

• eventName: string | symbol

• listener: (...args) => void

Returns​

this

Inherited from​

EventEmitter.addListener

Since​

v0.1.26

Source​

node_modules/@types/node/events.d.ts:354

closeGroup()​

closeGroup(): void

Close a group of output

Returns​

void

Source​

src/core.ts:303

emit()​

emit(eventName, ...args): boolean

Synchronously calls each of the listeners registered for the event namedeventName, in the order they were registered, passing the supplied arguments to each.

Returns true if the event had listeners, false otherwise.

const EventEmitter = require('events');
const myEmitter = new EventEmitter();

// First listener
myEmitter.on('event', function firstListener() {
  console.log('Helloooo! first listener');
});
// Second listener
myEmitter.on('event', function secondListener(arg1, arg2) {
  console.log(`event with parameters ${arg1}, ${arg2} in second listener`);
});
// Third listener
myEmitter.on('event', function thirdListener(...args) {
  const parameters = args.join(', ');
  console.log(`event with parameters ${parameters} in third listener`);
});

console.log(myEmitter.listeners('event'));

myEmitter.emit('event', 1, 2, 3, 4, 5);

// Prints:
// [
//   [Function: firstListener],
//   [Function: secondListener],
//   [Function: thirdListener]
// ]
// Helloooo! first listener
// event with parameters 1, 2 in second listener
// event with parameters 1, 2, 3, 4, 5 in third listener

Parameters​

• eventName: string | symbol

• ...args: any[]

Returns​

boolean

Inherited from​

EventEmitter.emit

Since​

v0.1.26

Source​

node_modules/@types/node/events.d.ts:610

emitMessage()​

protected emitMessage(event, infos): void

Send an event with default informations

Parameters​

• event: WorkerMessageType

• infos: any= {}

Returns​

void

Source​

src/core.ts:224

eventNames()​

eventNames(): (string | symbol)[]

Returns an array listing the events for which the emitter has registered listeners. The values in the array are strings or Symbols.

const EventEmitter = require('events');
const myEE = new EventEmitter();
myEE.on('foo', () => {});
myEE.on('bar', () => {});

const sym = Symbol('symbol');
myEE.on(sym, () => {});

console.log(myEE.eventNames());
// Prints: [ 'foo', 'bar', Symbol(symbol) ]

Returns​

(string | symbol)[]

Inherited from​

EventEmitter.eventNames

Since​

v6.0.0

Source​

node_modules/@types/node/events.d.ts:669

getBunyanLogger()​

getBunyanLogger(): Object

Returns​

Object

debug​

debug: (...args) => boolean | void

Parameters​

• ...args: any[]

Returns​

boolean | void

error​

error: (...args) => boolean | void

Parameters​

• ...args: any[]

Returns​

boolean | void

fatal​

fatal: (...args) => boolean | void

Parameters​

• ...args: any[]

Returns​

boolean | void

info​

info: (...args) => boolean | void

Parameters​

• ...args: any[]

Returns​

boolean | void

trace​

trace: (...args) => boolean | void

Parameters​

• ...args: any[]

Returns​

boolean | void

warn​

warn: (...args) => boolean | void

Parameters​

• ...args: any[]

Returns​

boolean | void

Source​

src/core.ts:325

getMaxListeners()​

getMaxListeners(): number

Returns the current max listener value for the EventEmitter which is either set by emitter.setMaxListeners(n) or defaults to defaultMaxListeners.

Returns​

number

Inherited from​

EventEmitter.getMaxListeners

Since​

v1.0.0

Source​

node_modules/@types/node/events.d.ts:526

incrementProgress()​

incrementProgress(inc, uid, title?): void

Increment to add to progress

Parameters​

• inc: number= 1

• uid: string= undefined

• title?: string

Returns​

void

Source​

src/core.ts:257

listenerCount()​

listenerCount(eventName): number

Returns the number of listeners listening to the event named eventName.

Parameters​

• eventName: string | symbol

The name of the event being listened for

Returns​

number

Inherited from​

EventEmitter.listenerCount

Since​

v3.2.0

Source​

node_modules/@types/node/events.d.ts:616

listeners()​

listeners(eventName): Function[]

Returns a copy of the array of listeners for the event named eventName.

server.on('connection', (stream) => {
  console.log('someone connected!');
});
console.log(util.inspect(server.listeners('connection')));
// Prints: [ [Function] ]

Parameters​

• eventName: string | symbol

Returns​

Function[]

Inherited from​

EventEmitter.listeners

Since​

v0.1.26

Source​

node_modules/@types/node/events.d.ts:539

log()​

log(level, ...args): void

Log something

Parameters​

• level: WorkerLogLevel

of log to use with filtering

• ...args: any[]

anything you want to log

Returns​

void

Source​

src/core.ts:317

logWithContext()​

logWithContext(level, context, ...args): void

Parameters​

• level: WorkerLogLevel

• context: any

• ...args: any[]

Returns​

void

Source​

src/core.ts:377

off()​

off(eventName, listener): this

Alias for emitter.removeListener().

Parameters​

• eventName: string | symbol

• listener: (...args) => void

Returns​

this

Inherited from​

EventEmitter.off

Since​

v10.0.0

Source​

node_modules/@types/node/events.d.ts:499

on()​

on(eventName, listener): this

Adds the listener function to the end of the listeners array for the event named eventName. No checks are made to see if the listener has already been added. Multiple calls passing the same combination of eventNameand listener will result in the listener being added, and called, multiple times.

server.on('connection', (stream) => {
  console.log('someone connected!');
});

Returns a reference to the EventEmitter, so that calls can be chained.

By default, event listeners are invoked in the order they are added. Theemitter.prependListener() method can be used as an alternative to add the event listener to the beginning of the listeners array.

const myEE = new EventEmitter();
myEE.on('foo', () => console.log('a'));
myEE.prependListener('foo', () => console.log('b'));
myEE.emit('foo');
// Prints:
//   b
//   a

Parameters​

• eventName: string | symbol

The name of the event.

• listener: (...args) => void

The callback function

Returns​

this

Inherited from​

EventEmitter.on

Since​

v0.1.101

Source​

node_modules/@types/node/events.d.ts:385

once()​

once(eventName, listener): this

Adds a one-timelistener function for the event named eventName. The next time eventName is triggered, this listener is removed and then invoked.

server.once('connection', (stream) => {
  console.log('Ah, we have our first user!');
});

Returns a reference to the EventEmitter, so that calls can be chained.

By default, event listeners are invoked in the order they are added. Theemitter.prependOnceListener() method can be used as an alternative to add the event listener to the beginning of the listeners array.

const myEE = new EventEmitter();
myEE.once('foo', () => console.log('a'));
myEE.prependOnceListener('foo', () => console.log('b'));
myEE.emit('foo');
// Prints:
//   b
//   a

Parameters​

• eventName: string | symbol

The name of the event.

• listener: (...args) => void

The callback function

Returns​

this

Inherited from​

EventEmitter.once

Since​

v0.3.0

Source​

node_modules/@types/node/events.d.ts:414

openGroup()​

openGroup(name): void

Create a new group of output Groups will stack

Parameters​

• name: string= ""

of group

Returns​

void

Source​

src/core.ts:295

prependListener()​

prependListener(eventName, listener): this

Adds the listener function to the beginning of the listeners array for the event named eventName. No checks are made to see if the listener has already been added. Multiple calls passing the same combination of eventNameand listener will result in the listener being added, and called, multiple times.

server.prependListener('connection', (stream) => {
  console.log('someone connected!');
});

Returns a reference to the EventEmitter, so that calls can be chained.

Parameters​

• eventName: string | symbol

The name of the event.

• listener: (...args) => void

The callback function

Returns​

this

Inherited from​

EventEmitter.prependListener

Since​

v6.0.0

Source​

node_modules/@types/node/events.d.ts:634

prependOnceListener()​

prependOnceListener(eventName, listener): this

Adds a one-timelistener function for the event named eventName to the beginning of the listeners array. The next time eventName is triggered, this listener is removed, and then invoked.

server.prependOnceListener('connection', (stream) => {
  console.log('Ah, we have our first user!');
});

Returns a reference to the EventEmitter, so that calls can be chained.

Parameters​

• eventName: string | symbol

The name of the event.

• listener: (...args) => void

The callback function

Returns​

this

Inherited from​

EventEmitter.prependOnceListener

Since​

v6.0.0

Source​

node_modules/@types/node/events.d.ts:650

rawListeners()​

rawListeners(eventName): Function[]

Returns a copy of the array of listeners for the event named eventName, including any wrappers (such as those created by .once()).

const emitter = new EventEmitter();
emitter.once('log', () => console.log('log once'));

// Returns a new Array with a function `onceWrapper` which has a property
// `listener` which contains the original listener bound above
const listeners = emitter.rawListeners('log');
const logFnWrapper = listeners[0];

// Logs "log once" to the console and does not unbind the `once` event
logFnWrapper.listener();

// Logs "log once" to the console and removes the listener
logFnWrapper();

emitter.on('log', () => console.log('log persistently'));
// Will return a new Array with a single function bound by `.on()` above
const newListeners = emitter.rawListeners('log');

// Logs "log persistently" twice
newListeners[0]();
emitter.emit('log');

Parameters​

• eventName: string | symbol

Returns​

Function[]

Inherited from​

EventEmitter.rawListeners

Since​

v9.4.0

Source​

node_modules/@types/node/events.d.ts:569

removeAllListeners()​

removeAllListeners(event?): this

Removes all listeners, or those of the specified eventName.

It is bad practice to remove listeners added elsewhere in the code, particularly when the EventEmitter instance was created by some other component or module (e.g. sockets or file streams).

Returns a reference to the EventEmitter, so that calls can be chained.

Parameters​

• event?: string | symbol

Returns​

this

Inherited from​

EventEmitter.removeAllListeners

Since​

v0.1.26

Source​

node_modules/@types/node/events.d.ts:510

removeListener()​

removeListener(eventName, listener): this

Removes the specified listener from the listener array for the event namedeventName.

const callback = (stream) => {
  console.log('someone connected!');
};
server.on('connection', callback);
// ...
server.removeListener('connection', callback);

removeListener() will remove, at most, one instance of a listener from the listener array. If any single listener has been added multiple times to the listener array for the specified eventName, then removeListener() must be called multiple times to remove each instance.

Once an event is emitted, all listeners attached to it at the time of emitting are called in order. This implies that anyremoveListener() or removeAllListeners() calls after emitting and before the last listener finishes execution will not remove them fromemit() in progress. Subsequent events behave as expected.

const myEmitter = new MyEmitter();

const callbackA = () => {
  console.log('A');
  myEmitter.removeListener('event', callbackB);
};

const callbackB = () => {
  console.log('B');
};

myEmitter.on('event', callbackA);

myEmitter.on('event', callbackB);

// callbackA removes listener callbackB but it will still be called.
// Internal listener array at time of emit [callbackA, callbackB]
myEmitter.emit('event');
// Prints:
//   A
//   B

// callbackB is now removed.
// Internal listener array [callbackA]
myEmitter.emit('event');
// Prints:
//   A

Because listeners are managed using an internal array, calling this will change the position indices of any listener registered after the listener being removed. This will not impact the order in which listeners are called, but it means that any copies of the listener array as returned by the emitter.listeners() method will need to be recreated.

When a single function has been added as a handler multiple times for a single event (as in the example below), removeListener() will remove the most recently added instance. In the example the once('ping')listener is removed:

const ee = new EventEmitter();

function pong() {
  console.log('pong');
}

ee.on('ping', pong);
ee.once('ping', pong);
ee.removeListener('ping', pong);

ee.emit('ping');
ee.emit('ping');

Returns a reference to the EventEmitter, so that calls can be chained.

Parameters​

• eventName: string | symbol

• listener: (...args) => void

Returns​

this

Inherited from​

EventEmitter.removeListener

Since​

v0.1.26

Source​

node_modules/@types/node/events.d.ts:494

requestInput()​

requestInput(title, type, regexp, waitFor, timeout): Promise<string>

Request a user input

Parameters​

• title: string

of the input

• type: WorkerInputType= WorkerInputType.STRING

• regexp: (string | RegExp)[]= undefined

to validate the input

• waitFor: boolean= true

call waitFor method

• timeout: number= 0

before giving up on input

Return the input request uuid if no waitFor or the input value Reject with "Request input timmeout" if timeout

Returns​

Promise<string>

Source​

src/core.ts:401

returnInput()​

returnInput(uuid, value): void

Send the result of an input To be used by the listeners

Parameters​

• uuid: string

of input

• value: string

entered by user

Returns​

void

Source​

src/core.ts:455

setInteractive()​

setInteractive(interactive): void

Indicate that some listeners allow input

Parameters​

• interactive: boolean

Returns​

void

Source​

src/core.ts:386

setMaxListeners()​

setMaxListeners(n): this

By default EventEmitters will print a warning if more than 10 listeners are added for a particular event. This is a useful default that helps finding memory leaks. The emitter.setMaxListeners() method allows the limit to be modified for this specific EventEmitter instance. The value can be set toInfinity (or 0) to indicate an unlimited number of listeners.

Returns a reference to the EventEmitter, so that calls can be chained.

Parameters​

• n: number

Returns​

this

Inherited from​

EventEmitter.setMaxListeners

Since​

v0.3.5

Source​

node_modules/@types/node/events.d.ts:520

setTitle()​

setTitle(title): void

Set the output title

Parameters​

• title: string

to set

Returns​

void

Source​

src/core.ts:233

startProgress()​

startProgress(uid, total, title?): void

Start a new progress indicator

Parameters​

• uid: string

• total: number

• title?: string

Returns​

void

Source​

src/core.ts:244

updateProgress()​

updateProgress(current, uid, title?): void

Update a progress indicator

Parameters​

• current: number

value

• uid: string= undefined

id of the progress or default one

• title?: string

update title as well

Returns​

void

Source​

src/core.ts:271

waitForInput()​

waitForInput(uuid): Promise<string>

Wait until an answer is provided

Parameters​

• uuid: string

of input to wait for

Returns​

Promise<string>

Source​

src/core.ts:438

getEventListeners()​

static getEventListeners(emitter, name): Function[]

Returns a copy of the array of listeners for the event named eventName.

For EventEmitters this behaves exactly the same as calling .listeners on the emitter.

For EventTargets this is the only way to get the event listeners for the event target. This is useful for debugging and diagnostic purposes.

const { getEventListeners, EventEmitter } = require('events');

{
  const ee = new EventEmitter();
  const listener = () => console.log('Events are fun');
  ee.on('foo', listener);
  getEventListeners(ee, 'foo'); // [listener]
}
{
  const et = new EventTarget();
  const listener = () => console.log('Events are fun');
  et.addEventListener('foo', listener);
  getEventListeners(et, 'foo'); // [listener]
}

Parameters​

• emitter: EventEmitter | _DOMEventTarget

• name: string | symbol

Returns​

Function[]

Inherited from​

EventEmitter.getEventListeners

Since​

v15.2.0, v14.17.0

Source​

node_modules/@types/node/events.d.ts:299

listenerCount()​

static listenerCount(emitter, eventName): number

A class method that returns the number of listeners for the given eventNameregistered on the given emitter.

const { EventEmitter, listenerCount } = require('events');
const myEmitter = new EventEmitter();
myEmitter.on('event', () => {});
myEmitter.on('event', () => {});
console.log(listenerCount(myEmitter, 'event'));
// Prints: 2

Parameters​

• emitter: EventEmitter

The emitter to query

• eventName: string | symbol

The event name

Returns​

number

Inherited from​

EventEmitter.listenerCount

Since​

v0.9.12

Deprecated​

Since v3.2.0 - Use listenerCount instead.

Source​

node_modules/@types/node/events.d.ts:271

on()​

static on(emitter, eventName, options?): AsyncIterableIterator<any, any, any>

const { on, EventEmitter } = require('events');

(async () => {
  const ee = new EventEmitter();

  // Emit later on
  process.nextTick(() => {
    ee.emit('foo', 'bar');
    ee.emit('foo', 42);
  });

  for await (const event of on(ee, 'foo')) {
    // The execution of this inner block is synchronous and it
    // processes one event at a time (even with await). Do not use
    // if concurrent execution is required.
    console.log(event); // prints ['bar'] [42]
  }
  // Unreachable here
})();

Returns an AsyncIterator that iterates eventName events. It will throw if the EventEmitter emits 'error'. It removes all listeners when exiting the loop. The value returned by each iteration is an array composed of the emitted event arguments.

An AbortSignal can be used to cancel waiting on events:

const { on, EventEmitter } = require('events');
const ac = new AbortController();

(async () => {
  const ee = new EventEmitter();

  // Emit later on
  process.nextTick(() => {
    ee.emit('foo', 'bar');
    ee.emit('foo', 42);
  });

  for await (const event of on(ee, 'foo', { signal: ac.signal })) {
    // The execution of this inner block is synchronous and it
    // processes one event at a time (even with await). Do not use
    // if concurrent execution is required.
    console.log(event); // prints ['bar'] [42]
  }
  // Unreachable here
})();

process.nextTick(() => ac.abort());

Parameters​

• emitter: EventEmitter

• eventName: string

The name of the event being listened for

• options?: StaticEventEmitterOptions

Returns​

AsyncIterableIterator<any, any, any>

that iterates eventName events emitted by the emitter

Inherited from​

EventEmitter.on

Since​

v13.6.0, v12.16.0

Source​

node_modules/@types/node/events.d.ts:254

once()​

once(emitter, eventName, options)​

static once(emitter, eventName, options?): Promise<any[]>

Creates a Promise that is fulfilled when the EventEmitter emits the given event or that is rejected if the EventEmitter emits 'error' while waiting. The Promise will resolve with an array of all the arguments emitted to the given event.

This method is intentionally generic and works with the web platform EventTarget interface, which has no special'error' event semantics and does not listen to the 'error' event.

const { once, EventEmitter } = require('events');

async function run() {
  const ee = new EventEmitter();

  process.nextTick(() => {
    ee.emit('myevent', 42);
  });

  const [value] = await once(ee, 'myevent');
  console.log(value);

  const err = new Error('kaboom');
  process.nextTick(() => {
    ee.emit('error', err);
  });

  try {
    await once(ee, 'myevent');
  } catch (err) {
    console.log('error happened', err);
  }
}

run();

The special handling of the 'error' event is only used when events.once()is used to wait for another event. If events.once() is used to wait for the 'error' event itself, then it is treated as any other kind of event without special handling:

const { EventEmitter, once } = require('events');

const ee = new EventEmitter();

once(ee, 'error')
  .then(([err]) => console.log('ok', err.message))
  .catch((err) => console.log('error', err.message));

ee.emit('error', new Error('boom'));

// Prints: ok boom

An AbortSignal can be used to cancel waiting for the event:

const { EventEmitter, once } = require('events');

const ee = new EventEmitter();
const ac = new AbortController();

async function foo(emitter, event, signal) {
  try {
    await once(emitter, event, { signal });
    console.log('event emitted!');
  } catch (error) {
    if (error.name === 'AbortError') {
      console.error('Waiting for the event was canceled!');
    } else {
      console.error('There was an error', error.message);
    }
  }
}

foo(ee, 'foo', ac.signal);
ac.abort(); // Abort waiting for the event
ee.emit('foo'); // Prints: Waiting for the event was canceled!
Parameters​

• emitter: _NodeEventTarget

• eventName: string | symbol

• options?: StaticEventEmitterOptions

Returns​

Promise<any[]>

Inherited from​

EventEmitter.once

Since​

v11.13.0, v10.16.0

Source​

node_modules/@types/node/events.d.ts:194

once(emitter, eventName, options)​

static once(emitter, eventName, options?): Promise<any[]>

Parameters​

• emitter: _DOMEventTarget

• eventName: string

• options?: StaticEventEmitterOptions

Returns​

Promise<any[]>

Inherited from​

EventEmitter.once

Source​

node_modules/@types/node/events.d.ts:195

setMaxListeners()​

static setMaxListeners(n?, ...eventTargets?): void

const {
  setMaxListeners,
  EventEmitter
} = require('events');

const target = new EventTarget();
const emitter = new EventEmitter();

setMaxListeners(5, target, emitter);

Parameters​

• n?: number

A non-negative number. The maximum number of listeners per EventTarget event.

• ...eventTargets?: (EventEmitter | _DOMEventTarget)[]

Returns​

void

Inherited from​

EventEmitter.setMaxListeners

Since​

v15.4.0

Source​

node_modules/@types/node/events.d.ts:317