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sdk-base

3.6.0 • Public • Published

sdk-base

NPM version build status Test coverage David deps npm download

A base class for sdk with some common & useful functions.

Installation

$ npm install sdk-base

Usage

Constructor argument:

  • {Object} options

    • {String} [initMethod] - the async init method name, the method should be a generator function or a function return promise. If set, will execute the function in the constructor.
    'use strict';
     
    const co = require('co');
    const Base = require('sdk-base');
     
    class Client extends Base {
      constructor() {
        super({
          initMethod: 'init',
        });
      }
     
      * init() {
        // put your async init logic here
      }
      // support async function too
      // async init() {
      //   // put your async init logic here
      // }
    }
     
    co(function* () {
      const client = new Client();
      // wait client ready, if init failed, client will throw an error.
      yield client.ready();
     
      // support generator event listener
      client.on('data', function* (data) {
        // put your async process logic here
        //
        // @example
        // ----------
        // yield submit(data);
      });
     
      client.emit('data', { foo: 'bar' });
     
    }).catch(err => { console.error(err); });

API

  • .ready(flagOrFunction) flagOrFunction is optional, and the argument type can be Boolean, Error or Function.

    // init ready
    client.ready(true);
    // init failed
    client.ready(new Error('init failed'));
     
    // listen client ready
    client.ready(err => {
      if (err) {
        console.log('client init failed');
        console.error(err);
        return;
      }
      console.log('client is ready');
    });
     
    // support promise style call
    client.ready()
      .then(() => { ... })
      .catch(err => { ... });
     
    // support generator style call
    yield client.ready();
  • .isReady getter detect client start ready or not.

  • .on(event, listener) wrap the EventEmitter.prototype.on(event, listener), the only difference is to support adding generator listener on events, except 'error' event.

  • once(event, listener) wrap the EventEmitter.prototype.once(event, listener), the only difference is to support adding generator listener on events, except 'error' event.

  • prependListener(event, listener) wrap the EventEmitter.prototype.prependListener(event, listener), the only difference is to support adding generator listener on events, except 'error' event.

  • prependOnceListener(event, listener) wrap the EventEmitter.prototype.prependOnceListener(event, listener), the only difference is to support adding generator listener on events, except 'error' event.

  • addListener(event, listener) wrap the EventEmitter.prototype.addListener(event, listener), the only difference is to support adding generator listener on events, except 'error' event.

    client.on('data', function* (data) {
      // your async process logic here
    });
    client.once('foo', function* (bar) {
      // ...
    });
     
    // listen error event
    client.on('error', err => {
      console.error(err.stack);
    });
  • .await(event): await an event, return a promise, and it will resolve(reject if event is error) once this event emmited.

    co(function* () {
      const data = yield client.await('data');
    });
  • .awaitFirst(event): await the first event in a set of event pairs, return a promise, and it will clean up after itself.

    co(function* () {
      const o = yield client.awaitFirst([ 'foo', 'bar' ]);
      if (o.event === 'foo') {
        // ...
      }
      if (o.event === 'bar') {
        // ...
      }
    });
  • ._close(): The _close() method is called by close, It can be overridden by child class, but should not be called directly. It must return promise or generator.

  • .close(): The close() method is used to close the instance.

License

MIT

Keywords

install

npm i sdk-base

Downloadsweekly downloads

17,540

version

3.6.0

license

MIT

homepage

github.com

repository

Gitgithub

last publish

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