Java

Read Bitfinex WebSocket Ticker Channel

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Subscribes to the public Bitfinex websocket ticker channel and receives ticker updates. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkWebSocket ws = new CkWebSocket();

    // For brevity, this example does not check for errors when etablishing the WebSocket connection.
    // See Establish WebSocket Connection for more complete sample code for making the connection.

    CkRest rest = new CkRest();

    // Connect to api.bitfinex.com
    success = rest.Connect("api.bitfinex.com",443,true,false);
    ws.UseConnection(rest);
    ws.AddClientHeaders();

    String responseBody = rest.fullRequestNoBody("GET","/ws");
    success = ws.ValidateServerHandshake();
    if (success != true) {
        System.out.println(ws.lastErrorText());
        System.out.println(responseBody);
        System.out.println(rest.responseHeader());
        return;
        }

    // After connecting, the bitfinex websocket server will send
    // an info message that contains the actual version of the websocket stream.
    // Receive that message..
    success = ws.ReadFrame();
    if (success != true) {
        System.out.println("Failed to receive a frame");
        System.out.println("ReadFrame fail reason = " + ws.get_ReadFrameFailReason());
        System.out.println(ws.lastErrorText());
        return;
        }

    // We should get this:
    // {"event":"info","version":1.1,"platform":{"status":1}}
    System.out.println(ws.getFrameData());

    // Subscribe to the public ticker feed.
    // See https://docs.bitfinex.com/docs for more information.
    CkJsonObject json = new CkJsonObject();
    json.AppendString("event","subscribe");
    json.AppendString("channel","ticker");
    json.AppendString("pair","BTCUSD");

    boolean finalFrame = true;
    success = ws.SendFrame(json.emit(),finalFrame);

    // Read the response.
    success = ws.ReadFrame();
    if (success != true) {
        System.out.println("Failed to receive a frame");
        System.out.println("ReadFrame fail reason = " + ws.get_ReadFrameFailReason());
        System.out.println(ws.lastErrorText());
        return;
        }

    // Examine the response
    // We should get this:
    // {"event":"subscribed","channel":"ticker","chanId":2751,"pair":"BTCUSD"}
    System.out.println(ws.getFrameData());

    // Begin reading the ticker feed.
    // We'll just read the 1st 5 updates and then exit..
    boolean receivedFinalFrame = false;
    int numUpdatesReceived = 0;
    while (numUpdatesReceived < 5) {

        success = ws.ReadFrame();
        if (success != true) {
            System.out.println("Failed to receive a frame");
            System.out.println("ReadFrame fail reason = " + ws.get_ReadFrameFailReason());
            System.out.println(ws.lastErrorText());
            return;
            }

        // The responses we desire are in Text frames, where the opcode = 1.
        if (ws.get_FrameOpcodeInt() == 1) {
            String receivedText = ws.getFrameData();
            System.out.println(receivedText);
            // Should receive a line of text such as this:
            // [2751,7349,36.34269559,7349.1,41.01777063,-116.2,-0.0156,7349.1,22188.26055319,7560,7270.5]
            numUpdatesReceived = numUpdatesReceived+1;
            }

        }

    // Close the websocket connection.
    success = ws.SendClose(true,1000,"Closing this websocket.");
    if (success != true) {
        System.out.println(ws.lastErrorText());
        return;
        }

    // Read the Close response.
    success = ws.ReadFrame();
    if (success != true) {
        System.out.println("ReadFrame fail reason = " + ws.get_ReadFrameFailReason());
        System.out.println(ws.lastErrorText());
        return;
        }

    System.out.println("Success.");
  }
}