Zig

WebSocket Binance Trade Stream (subscribe and receive updates)

See more WebSocket Examples

Subscribe to a binance trade stream and receive updates. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

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

    const ws = try chilkat.WebSocket.init();
    defer ws.deinit();

    // 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.

    const rest = try chilkat.Rest.init();
    defer rest.deinit();

    // Connect to wss://stream.binance.com:9443
    rest.connect("stream.binance.com", 9443, true, false) catch {
        std.debug.print("{s}\n", .{try rest.getLastErrorText(alloc)});
        return;
    };

    ws.useConnection(rest) catch {
        std.debug.print("{s}\n", .{try ws.getLastErrorText(alloc)});
        return;
    };

    ws.addClientHeaders() catch {};

    //  Raw streams are accessed at /ws/<streamName>
    const response_body = rest.fullRequestNoBody(alloc, "GET", "/ws/btcusdt") catch {
        std.debug.print("{s}\n", .{try rest.getLastErrorText(alloc)});
        return;
    };

    ws.validateServerHandshake() catch {
        std.debug.print("{s}\n", .{try ws.getLastErrorText(alloc)});
        std.debug.print("{s}\n", .{response_body});
        std.debug.print("{s}\n", .{try rest.getResponseHeader(alloc)});
        return;
    };

    std.debug.print("{s}\n", .{response_body});
    std.debug.print("{s}\n", .{try rest.getResponseHeader(alloc)});

    // POST JSON to subscribe to a stream

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

    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.updateString("method", "SUBSCRIBE") catch {};
    json.updateString("params[0]", "btcusdt@aggTrade") catch {};
    json.updateString("params[1]", "btcusdt@depth") catch {};
    json.updateInt("id", 1) catch {};

    // Send a full message in a single frame
    const final_frame = true;
    ws.sendFrame(try json.emit(alloc), final_frame) catch {
        std.debug.print("{s}\n", .{try ws.getLastErrorText(alloc)});
        return;
    };

    const json_trade_data = try chilkat.JsonObject.init();
    defer json_trade_data.deinit();
    json_trade_data.setEmitCompact(false);

    // Begin reading the trade stream response.
    // We'll just read the 1st 10 updates and then exit..
    var num_trades_received: i32 = 0;
    while (num_trades_received < 5) {
        ws.readFrame() catch {
            std.debug.print("Failed to receive a frame\n", .{});
            std.debug.print("ReadFrame fail reason = {d}\n", .{ws.getReadFrameFailReason()});
            std.debug.print("{s}\n", .{try ws.getLastErrorText(alloc)});
            return;
        };

        // The responses we desire are in Text frames, where the opcode = 1.
        if (ws.getFrameOpcodeInt() == 1) {
            const received_json = try ws.getFrameData(alloc);

            json_trade_data.load(received_json) catch {};
            std.debug.print("{s}\n", .{try json_trade_data.emit(alloc)});

            num_trades_received = num_trades_received + 1;
        }
    }

    // Close the websocket connection.
    ws.sendClose(true, 1000, "Closing this websocket.") catch {
        std.debug.print("{s}\n", .{try ws.getLastErrorText(alloc)});
        return;
    };

    // Read the Close response.
    ws.readFrame() catch {
        std.debug.print("ReadFrame fail reason = {d}\n", .{ws.getReadFrameFailReason()});
        std.debug.print("{s}\n", .{try ws.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Success.\n", .{});

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