Phoenix Channel WeChat miniProgram client transport

phoenix_channel_wechat_miniprogram_client_transport.js

//This is a WeChat miniprogram client transport for phoenix.js 
// so that you can use easily use Phoenix Channel as a WebSocket server.
// Written by @chrismccord
// example usage:
// ```
// let socket = new Socket("ws://localhost:4000/socket", { transport: WxSocket })
// socket.connect()
// let channel = socket.channel("room:lobby", {})
// channel.join()
//   .receive("ok", resp => { console.log("Joined successfully", resp) })
//   .receive("error", resp => { console.log("Unable to join", resp) })
//
// channel.push("new_msg", {body: "Hello from miniprogram!"})
// ```


class WxSocket {
  constructor(url) {
    // Create the underlying connection, which in this case is a SocketTask
    this.conn = wx.connectSocket({ url: url }) 
    
    const SOCKET_STATES = { connecting: 0, open: 1, closing: 2, closed: 3 }
    this.readyState = SOCKET_STATES.connecting

    this.onopen = function () { }
    this.onerror = function () { }
    this.onmessage = function () { }
    this.onclose = function () { }

    this.conn.onOpen(() => {
      this.readyState = SOCKET_STATES.open
      this.onopen()
    })
    this.conn.onError(error => {
      this.readyState = SOCKET_STATES.closed
      this.onerror(error)
    })
    this.conn.onMessage(event => {
      this.onmessage(event)
    })
    this.conn.onClose(event => {
      this.readyState = SOCKET_STATES.closed
      this.onclose(event)
    })

    this.close = this.conn.close
  }

  send(encodedData) {
    this.conn.send({ data: encodedData })
  }
}