Options
All
  • Public
  • Public/Protected
  • All
Menu

Class XAPI

User-facing API towards the XAPI. Requires a backend for communicating with an XAPI instance. It should be possible to write backends for all kinds of transports (TSH over SSH, Websockets, HTTP, plain sockets, etc.)

Initialization

const xapi = new XAPI(backend);

Invoke command

xapi
.command('Dial', { Number: 'johndoe@example.com' })
.then(onSuccess, onFailure);

// Alternate notation
xapi
.Command.Dial({ Number: 'johndoe@example.com' })
.then(onSuccess, onFailure);

Fetch a configuration

xapi
.config.get('Audio DefaultVolume')
.then((volume) => console.log(`default volume is: ${volume}`));

// Alternate notation
xapi.Audio.DefaultVolume
.get()
.then((volume) => console.log(`default volume is: ${volume}`));

Set a configuration

xapi.config.set('Audio DefaultVolume', 100);

// Alternate notation
xapi.Audio.DefaultVolume.set(100);

Fetch a status

xapi
.status.get('Audio Volume')
.then((volume) => { console.log(`volume is: ${volume}`); });

// Alternate notation
xapi.Status.Audio.Volume
.get()
.then((volume) => { console.log(`volume is: ${volume}`); });

Listen to an event

xapi.event.on('Message Send Text', (text) => {
console.log(`Received message text: ${text}`);
});

// Alternate notation
xapi.Event.Message.Send.Text.on((text) => {
console.log(`Received message text: ${text}`);
});

Hierarchy

  • EventEmitter
    • XAPI

Index

Constructors

constructor

Properties

Command

Command: any

Proxy for XAPI Status.

Config

Config: any

Proxy for XAPI Status.

Event

Event: any

Proxy for XAPI Status.

Status

Status: any

Proxy for XAPI Status.

config

config: Config = ...

Interface to XAPI configurations.

event

event: Event = ...

Interface to XAPI events.

feedback

feedback: default

Interface to XAPI feedback registration.

Private requestId

requestId: number = 1
param backend

Backend connected to an XAPI instance.

param options

XAPI object options.

Private requests

requests: Requests = {}

status

status: Status = ...

Interface to XAPI statuses.

version

version: string = version

Static Readonly captureRejectionSymbol

captureRejectionSymbol: typeof captureRejectionSymbol

Static captureRejections

captureRejections: boolean

Sets or gets the default captureRejection value for all emitters.

Static defaultMaxListeners

defaultMaxListeners: number

Static Readonly errorMonitor

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.

Methods

addListener

  • addListener(eventName: string | symbol, listener: (...args: any[]) => void): XAPI
  • Alias for emitter.on(eventName, listener).

    since

    v0.1.26

    Parameters

    • eventName: string | symbol
    • listener: (...args: any[]) => void
        • (...args: any[]): void
        • Parameters

          • Rest ...args: any[]

          Returns void

    Returns XAPI

close

command

  • command<T>(path: Path, params?: string | object, body?: string): Promise<T>
  • Executes the command specified by the given path.

    // Space delimited
    xapi.command('Presentation Start');

    // Slash delimited
    xapi.command('Presentation/Start');

    // Array path
    xapi.command(['Presentation', 'Start']);

    // With parameters
    xapi.command('Presentation Start', { PresentationSource: 1 });

    // Multi-line
    xapi.command('UserInterface Extensions Set', { ConfigId: 'example' }, `
    <Extensions>
    <Version>1.1</Version>
    <Panel item="1" maxOccurrence="n">
    <Icon>Lightbulb</Icon>
    <Type>Statusbar</Type>
    <Page item="1" maxOccurrence="n">
    <Name>Foo</Name>
    <Row item="1" maxOccurrence="n">
    <Name>Bar</Name>
    <Widget item="1" maxOccurrence="n">
    <WidgetId>widget_3</WidgetId>
    <Type>ToggleButton</Type>
    </Widget>
    </Row>
    </Page>
    </Panel>
    </Extensions>
    `);

    Type parameters

    • T = any

    Parameters

    • path: Path

      Path to command node.

    • Optional params: string | object

      Object containing named command arguments.

    • Optional body: string

      Multi-line body for commands requiring it.

    Returns Promise<T>

    Resolved with the command response when ready.

doc

  • doc<T>(path: Path): Promise<T>
  • Interface to XAPI documents.

    Type parameters

    • T = any

    Parameters

    • path: Path

      Path to xDocument.

    Returns Promise<T>

    xDocument as specified by path.

emit

  • emit(eventName: string | symbol, ...args: any[]): 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
    since

    v0.1.26

    Parameters

    • eventName: string | symbol
    • Rest ...args: any[]

    Returns boolean

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) ]
    since

    v6.0.0

    Returns (string | symbol)[]

execute

  • execute<T>(method: string, params: any): Promise<T>
  • Execute the given JSON-RPC request on the backend.

    xapi.execute('xFeedback/Subscribe', {
    Query: ['Status', 'Audio'],
    });

    Type parameters

    • T

      Return type.

    Parameters

    • method: string

      Name of RPC method to invoke.

    • params: any

      Parameters to add to the request.

    Returns Promise<T>

    Resolved with the command response.

getMaxListeners

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

    since

    v1.0.0

    Returns number

Private handleResponse

listenerCount

  • listenerCount(eventName: string | symbol): number
  • Returns the number of listeners listening to the event named eventName.

    since

    v3.2.0

    Parameters

    • eventName: string | symbol

      The name of the event being listened for

    Returns number

listeners

  • listeners(eventName: string | symbol): 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] ]
    since

    v0.1.26

    Parameters

    • eventName: string | symbol

    Returns Function[]

Private nextRequestId

  • nextRequestId(): string

off

  • off(eventName: string | symbol, listener: (...args: any[]) => void): XAPI
  • Alias for emitter.removeListener().

    since

    v10.0.0

    Parameters

    • eventName: string | symbol
    • listener: (...args: any[]) => void
        • (...args: any[]): void
        • Parameters

          • Rest ...args: any[]

          Returns void

    Returns XAPI

on

  • on(event: "error", listener: (error: Error) => void): XAPI
  • on(event: "ready", listener: (xapi: XAPI) => void): XAPI
  • on(event: string, listener: () => void): XAPI

once

  • once(eventName: string | symbol, listener: (...args: any[]) => void): XAPI
  • 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
    since

    v0.3.0

    Parameters

    • eventName: string | symbol

      The name of the event.

    • listener: (...args: any[]) => void

      The callback function

        • (...args: any[]): void
        • Parameters

          • Rest ...args: any[]

          Returns void

    Returns XAPI

prependListener

  • prependListener(eventName: string | symbol, listener: (...args: any[]) => void): XAPI
  • 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.

    since

    v6.0.0

    Parameters

    • eventName: string | symbol

      The name of the event.

    • listener: (...args: any[]) => void

      The callback function

        • (...args: any[]): void
        • Parameters

          • Rest ...args: any[]

          Returns void

    Returns XAPI

prependOnceListener

  • prependOnceListener(eventName: string | symbol, listener: (...args: any[]) => void): XAPI
  • 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.

    since

    v6.0.0

    Parameters

    • eventName: string | symbol

      The name of the event.

    • listener: (...args: any[]) => void

      The callback function

        • (...args: any[]): void
        • Parameters

          • Rest ...args: any[]

          Returns void

    Returns XAPI

rawListeners

  • rawListeners(eventName: string | symbol): 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');
    since

    v9.4.0

    Parameters

    • eventName: string | symbol

    Returns Function[]

removeAllListeners

  • removeAllListeners(event?: string | symbol): XAPI
  • 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.

    since

    v0.1.26

    Parameters

    • Optional event: string | symbol

    Returns XAPI

removeListener

  • removeListener(eventName: string | symbol, listener: (...args: any[]) => void): XAPI
  • 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.

    since

    v0.1.26

    Parameters

    • eventName: string | symbol
    • listener: (...args: any[]) => void
        • (...args: any[]): void
        • Parameters

          • Rest ...args: any[]

          Returns void

    Returns XAPI

setMaxListeners

  • setMaxListeners(n: number): XAPI
  • 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.

    since

    v0.3.5

    Parameters

    • n: number

    Returns XAPI

Static getEventListeners

  • getEventListeners(emitter: EventEmitter | DOMEventTarget, name: string | symbol): 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]
    }
    since

    v15.2.0

    Parameters

    • emitter: EventEmitter | DOMEventTarget
    • name: string | symbol

    Returns Function[]

Static listenerCount

  • listenerCount(emitter: EventEmitter, eventName: string | symbol): 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
    since

    v0.9.12

    deprecated

    Since v3.2.0 - Use listenerCount instead.

    Parameters

    • emitter: EventEmitter

      The emitter to query

    • eventName: string | symbol

      The event name

    Returns number

Static on

  • on(emitter: EventEmitter, eventName: string, options?: StaticEventEmitterOptions): AsyncIterableIterator<any>
  • ```js 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:

    ```js
    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());
    since

    v13.6.0, v12.16.0

    Parameters

    • emitter: EventEmitter
    • eventName: string

      The name of the event being listened for

    • Optional options: StaticEventEmitterOptions

    Returns AsyncIterableIterator<any>

    that iterates eventName events emitted by the emitter

Static once

  • once(emitter: NodeEventTarget, eventName: string | symbol, options?: StaticEventEmitterOptions): Promise<any[]>
  • once(emitter: DOMEventTarget, eventName: string, options?: StaticEventEmitterOptions): 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!
    since

    v11.13.0, v10.16.0

    Parameters

    • emitter: NodeEventTarget
    • eventName: string | symbol
    • Optional options: StaticEventEmitterOptions

    Returns Promise<any[]>

  • Parameters

    • emitter: DOMEventTarget
    • eventName: string
    • Optional options: StaticEventEmitterOptions

    Returns Promise<any[]>

Generated using TypeDoc