Zig

Duplicate Python websockets

See more WebSocket Examples

Demonstrates how to duplicate the following Python client-side websocket snippet:

async with websockets.connect('ws://192.168.1.35/websocket') as websocket:
await websocket.send("http.controller_login:username=xxx&password=xxxxx")
response = await websocket.recv()

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.

    // In Python, the following line of code does more than just connect:
    //
    //      websockets.connect('ws://192.168.1.35/websocket')
    //
    // It is connecting to 192.168.1.35 without using TLS.  If the URI starts with "wss://", then TLS should be used.
    // But this URI begins with just "ws:/", so no TLS.

    // Also, after connecting, a GET request is sent to the /websocket endpoint.
    // In summary, the websockets.connect function is establishing the connection and it sends a GET request.

    // First establish the connection.
    // No TLS, use the default HTTP port 80.
    const rest = try chilkat.Rest.init();
    defer rest.deinit();
    rest.connect("192.168.1.35", 80, false, false) catch {
        std.debug.print("{s}\n", .{try rest.getLastErrorText(alloc)});
        return;
    };

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

    // Tell the WebSocket to use this connection.
    ws.useConnection(rest) catch {
        std.debug.print("{s}\n", .{try ws.getLastErrorText(alloc)});
        return;
    };

    // Add the standard WebSocket open handshake headers that will be needed.
    // (This adds the required HTTP request headers to the rest object.)
    ws.addClientHeaders() catch {};

    // Now send the GET request to /websockets.
    const response_body = rest.fullRequestNoBody(alloc, "GET", "/websockets") catch {
        std.debug.print("{s}\n", .{try rest.getLastErrorText(alloc)});
        return;
    };

    // If successful, the HTTP response status code should be 101,
    // and the response body will be empty. (If it failed, we'll have a look
    // at the response body..)
    const status_code = rest.getResponseStatusCode();
    std.debug.print("Response status code: {d}\n", .{status_code});

    if (status_code != 101) {
        std.debug.print("{s}\n", .{response_body});
        std.debug.print("-- Failed because of unexpected response status code.\n", .{});
        return;
    }

    // We have the expected 101 response, so let's now validate the
    // contents of the response.
    ws.validateServerHandshake() catch {
        std.debug.print("{s}\n", .{try ws.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("WebSocket connection successful.\n", .{});

    // The application may now begin sending and receiving frames on the WebSocket connection.

    // The 1st frame sent by the Python snippet is:
    //
    //     websocket.send("http.controller_login:username=xxx&password=xxxxx")
    //

    // Send the same using Chilkat, and get the response.
    const final_frame = true;
    ws.sendFrame("http.controller_login:username=xxx&password=xxxxx", final_frame) catch {
        std.debug.print("{s}\n", .{try ws.getLastErrorText(alloc)});
        return;
    };

    // Read an incoming frame.
    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;
    };

    // Show the string that was received.
    const received_str = try ws.getFrameData(alloc);
    std.debug.print("Received: {s}\n", .{received_str});

    // Continue with whatever additional communications are desired...
    // ....
    //
}