Java

Read Bitfinex WebSocket Ticker Channel

See more WebSocket Examples

Subscribes to the public Bitfinex websocket ticker channel and receives ticker updates. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Rest;
import com.chilkatsoft.chilkat2.WebSocket;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        WebSocket ws = new WebSocket();

        // 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.

        Rest rest = new Rest();

        // Connect to api.bitfinex.com
        rest.connect("api.bitfinex.com", 443, true, false);
        ws.useConnection(rest);
        ws.addClientHeaders();

        String responseBody = rest.fullRequestNoBody("GET", "/ws");
        try {
            ws.validateServerHandshake();
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            System.out.println(responseBody);
            System.out.println(rest.getResponseHeader());
            return;
        }

        // After connecting, the bitfinex websocket server will send
        // an info message that contains the actual version of the websocket stream.
        // Receive that message..
        try {
            ws.readFrame();
        } catch (ChilkatException e) {
            System.out.println("Failed to receive a frame");
            System.out.println("ReadFrame fail reason = " + ws.getReadFrameFailReason());
            System.out.println(e.getLastErrorText());
            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.
        JsonObject json = new JsonObject();
        json.appendString("event", "subscribe");
        json.appendString("channel", "ticker");
        json.appendString("pair", "BTCUSD");

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

        // Read the response.
        try {
            ws.readFrame();
        } catch (ChilkatException e) {
            System.out.println("Failed to receive a frame");
            System.out.println("ReadFrame fail reason = " + ws.getReadFrameFailReason());
            System.out.println(e.getLastErrorText());
            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..
        int numUpdatesReceived = 0;
        while (numUpdatesReceived < 5) {
            try {
                ws.readFrame();
            } catch (ChilkatException e) {
                System.out.println("Failed to receive a frame");
                System.out.println("ReadFrame fail reason = " + ws.getReadFrameFailReason());
                System.out.println(e.getLastErrorText());
                return;
            }

            // The responses we desire are in Text frames, where the opcode = 1.
            if (ws.getFrameOpcodeInt() == 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.
        try {
            ws.sendClose(true, 1000, "Closing this websocket.");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Read the Close response.
        try {
            ws.readFrame();
        } catch (ChilkatException e) {
            System.out.println("ReadFrame fail reason = " + ws.getReadFrameFailReason());
            System.out.println(e.getLastErrorText());
            return;
        }

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