fix-client/src/lib/handler/FIXParserClientSocket.js

A minimalist FIX API client

const { Socket } = require('net')

const FIXParserClientBase = require('./FIXParserClientBase')
const FrameDecoder = require('../util/FrameDecoder')
const { Message } = require('../message/Message')

class FIXParserClientSocket extends FIXParserClientBase {
  connect() {
    this.socket = new Socket();
    this.socket.setEncoding('ascii');
    this.socket.pipe(new FrameDecoder()).on('data', (data) => {
      const messages = this.fixParser.parse(data.toString());
      let i = 0;
      for (i; i < messages.length; i++) {
        this.processMessage(messages[i]);
        this.eventEmitter.emit('message', messages[i]);
      }
    });
    this.socket.on('close', () => {
      this.eventEmitter.emit('close');
      this.stopHeartbeat();
    });

    this.socket.on('error', (error) => {
      this.eventEmitter.emit('error', error);
      this.stopHeartbeat();
    });

    this.socket.on('timeout', () => {
      this.eventEmitter.emit('timeout');
      this.socket.end();
      this.stopHeartbeat();
    });

    this.socket.connect(
      this.port,
      this.host,
      () => {
        // console.log('[FIX] Connected', this.socket.readyState, `Port=${this.port} host=${this.host}`);
        if (this.socket.readyState === 'open') {
          this.eventEmitter.emit('open');
          this.startHeartbeat();
        }
      }
    );
  }

  close() {
    this.socket.close();
  }

  send(message) {
    if (this.socket.readyState === 'open') {
      if (message instanceof Message) {
        this.fixParser.setNextTargetMsgSeqNum(
          this.fixParser.getNextTargetMsgSeqNum() + 1
        );
        this.socket.write(message.encode());
      } else {
        console.error(
          'FIXParserClientSocket: could not send message, message of wrong type'
        );
      }
    } else {
      throw new Error(`FIXParserClientSocket: could not send message, socket not open ${message}`)
    }
  }
}

module.exports = FIXParserClientSocket