Class: WebSocketClient

Inherits:
Object
  • Object
show all
Defined in:
lib/ibm_watson/websocket/speech_to_text_websocket_listener.rb

Overview

Class for interacting with the WebSocket API

Instance Method Summary collapse

Constructor Details

#initialize(audio: nil, chunk_data:, options:, recognize_callback:, service_url:, headers:, disable_ssl_verification: false) ⇒ WebSocketClient

Returns a new instance of WebSocketClient.



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# File 'lib/ibm_watson/websocket/speech_to_text_websocket_listener.rb', line 14

def initialize(audio: nil, chunk_data:, options:, recognize_callback:, service_url:, headers:, disable_ssl_verification: false)
  @audio = audio
  @options = options
  @callback = recognize_callback
  @bytes_sent = 0
  @headers = headers
  @is_listening = false
  @service_url = service_url
  @timer = nil
  @chunk_data = chunk_data
  @mic_running = false
  @data_size = audio.nil? ? 0 : @audio.size
  @queue = Queue.new
  @disable_ssl_verification = disable_ssl_verification
end

Instance Method Details

#add_audio_chunk(chunk:) ⇒ Object 



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# File 'lib/ibm_watson/websocket/speech_to_text_websocket_listener.rb', line 98

def add_audio_chunk(chunk:)
  @data_size += chunk.size
  @queue << chunk
end

#start ⇒ Object 



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# File 'lib/ibm_watson/websocket/speech_to_text_websocket_listener.rb', line 30

def start
  on_open = lambda do |event|
    on_connect(event)
    @client.send(build_start_message(options: @options))
    @mic_running = true if @chunk_data
    send_audio(data: @audio)
  end

  on_message = lambda do |event|
    json_object = JSON.parse(event.data)
    if json_object.key?("error")
      error = json_object["error"]
      if error.start_with?(TIMEOUT_PREFIX)
        @callback.on_inactivity_timeout(error: error)
      else
        @callback.on_error(error: error)
      end
    elsif json_object.key?("state")
      if !@is_listening
        @is_listening = true
      else
        @client.send(build_close_message)
        @callback.on_transcription_complete
        @client.close(CLOSE_SIGNAL)
      end
    elsif json_object.key?("results") || json_object.key?("speaker_labels")
      hypothesis = ""
      unless json_object["results"].nil? && json_object["speaker_labels"].nil?
        hypothesis = json_object.dig("results", 0, "alternatives", 0, "transcript")
        b_final = json_object.dig("results", 0, "final")
        transcripts = extract_transcripts(alternatives: json_object.dig("results", 0, "alternatives"))

        @callback.on_hypothesis(hypothesis: hypothesis) if b_final

        @callback.on_transcription(transcript: transcripts)
        @callback.on_data(data: json_object)
      end
    end
  end

  on_close = lambda do |_event|
    @client = nil
    EM.stop_event_loop
  end

  on_error = lambda do |event|
    @callback.on_error(error: event)
  end

  EM&.reactor_thread&.join
  EM.run do
    if @disable_ssl_verification
      @service_url = @service_url.sub("wss:", "ws:")
      @client = Faye::WebSocket::Client.new(@service_url, nil, tls: { verify_peer: false, fail_if_no_peer_cert: false }, headers: @headers)
    else
      @client = Faye::WebSocket::Client.new(@service_url, nil, headers: @headers)
    end
    @client.onclose = on_close
    @client.onerror = on_error
    @client.onmessage = on_message
    @client.onopen = on_open
    @client.add_listener(Faye::WebSocket::API::Event.create("open"))
    @client.add_listener(Faye::WebSocket::API::Event.create("message"))
    @client.add_listener(Faye::WebSocket::API::Event.create("close"))
    @client.add_listener(Faye::WebSocket::API::Event.create("error"))
  end
end

#stop_audio ⇒ Object 



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# File 'lib/ibm_watson/websocket/speech_to_text_websocket_listener.rb', line 103

def stop_audio
  @mic_running = false
end