Java

WebSocket Binance Trade Stream (subscribe and receive updates)

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Subscribe to a binance trade stream and receive 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 wss://stream.binance.com:9443
    success = rest.Connect("stream.binance.com",9443,true,false);
    if (success == false) {
        System.out.println(rest.lastErrorText());
        return;
        }

    success = ws.UseConnection(rest);
    if (success == false) {
        System.out.println(ws.lastErrorText());
        return;
        }

    ws.AddClientHeaders();

    //  Raw streams are accessed at /ws/<streamName>
    String responseBody = rest.fullRequestNoBody("GET","/ws/btcusdt");
    if (rest.get_LastMethodSuccess() == false) {
        System.out.println(rest.lastErrorText());
        return;
        }

    success = ws.ValidateServerHandshake();
    if (success != true) {
        System.out.println(ws.lastErrorText());
        System.out.println(responseBody);
        System.out.println(rest.responseHeader());
        return;
        }

    System.out.println(responseBody);
    System.out.println(rest.responseHeader());

    // POST JSON to subscribe to a stream

    // {
    // "method": "SUBSCRIBE",
    // "params":
    // [
    // "btcusdt@aggTrade",
    // "btcusdt@depth"
    // ],
    // "id": 1
    // }

    CkJsonObject json = new CkJsonObject();
    json.UpdateString("method","SUBSCRIBE");
    json.UpdateString("params[0]","btcusdt@aggTrade");
    json.UpdateString("params[1]","btcusdt@depth");
    json.UpdateInt("id",1);

    // Send a full message in a single frame
    boolean finalFrame = true;
    success = ws.SendFrame(json.emit(),finalFrame);
    if (success != true) {
        System.out.println(ws.lastErrorText());
        return;
        }

    CkJsonObject jsonTradeData = new CkJsonObject();
    jsonTradeData.put_EmitCompact(false);

    // Begin reading the trade stream response.
    // We'll just read the 1st 10 updates and then exit..
    boolean receivedFinalFrame = false;
    int numTradesReceived = 0;
    while (numTradesReceived < 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 receivedJson = ws.getFrameData();

            jsonTradeData.Load(receivedJson);
            System.out.println(jsonTradeData.emit());

            numTradesReceived = numTradesReceived+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.");

    // The output of the above code is shown here:
  }
}