node-gpsd-client/message_buffer.js

A nodejs GPSD client library

// stolen from https://blog.irowell.io/blog/use-a-message-buffer-stack-to-handle-data/

class MessageBuffer {
  constructor (delimiter) {
    this.delimiter = delimiter
    this.buffer = ''
  }

  isFinished () {
    if (
      this.buffer.length === 0 ||
      this.buffer.indexOf(this.delimiter) === -1
    ) {
      return true
    }
    return false
  }

  push (data) {
    this.buffer += data
  }

  getMessage () {
    const delimiterIndex = this.buffer.indexOf(this.delimiter)
    if (delimiterIndex !== -1) {
      const message = this.buffer.slice(0, delimiterIndex)
      this.buffer = this.buffer.replace(message + this.delimiter, '')
      return message
    }
    return null
  }

  handleData () {
    /**
     * Try to accumulate the buffer with messages
     *
     * If the server isnt sending delimiters for some reason
     * then nothing will ever come back for these requests
     */
    const message = this.getMessage()
    return message
  }
}

module.exports = MessageBuffer