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Debugging with Socket Session Logging

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Debugging with socket session logging.

The Chilkat Socket component provides properties for keeping a session log making it possible to see the exact bytes received and sent on a TCP/IP or SSL connection. To enable session logging, set the KeepSessionLog property = _TRUE_. The SessionLogEncoding property controls how binary, non-printable bytes are represented in the log. There are two possible settings: Possible values are "esc" and "hex". The default value is "esc".

When set to "hex", the bytes are encoded as a hexidecimalized string. The "esc" encoding is a C-string like encoding, and is more compact than hex if most of the data to be logged is text. Printable us-ascii chars are unmodified. Common "C" control chars are represented as "\r", "\n", "\t", etc. Non-printable and byte values greater than 0x80 are escaped using a backslash and hex encoding: \xHH. Certain printable chars are backslashed: SPACE, double-quote, single-quote, etc.

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 socket = try chilkat.Socket.init();
    defer socket.deinit();

    // Enable session logging:
    socket.setKeepSessionLog(true);
    socket.setSessionLogEncoding("esc");

    // To demonstrate session logging, we'll connect to an
    // HTTP server and download the HTTP response header:
    const ssl = false;
    const max_wait_millisec = 20000;
    socket.connect("www.chilkatsoft.com", 80, ssl, max_wait_millisec) catch {
        std.debug.print("{s}\n", .{try socket.getLastErrorText(alloc)});
        return;
    };

    // Set maximum timeouts for reading an writing (in millisec)
    socket.setMaxReadIdleMs(10000);
    socket.setMaxSendIdleMs(10000);

    // The socket component includes a BuildHttpGetRequest
    // method for convenience. Build a GET and send it to
    // the web server:
    const http_get = try socket.buildHttpGetRequest(alloc, "http://www.chilkatsoft.com/");

    // Send it...
    socket.sendString(http_get) catch {
        std.debug.print("{s}\n", .{try socket.getLastErrorText(alloc)});
        return;
    };

    // Read the response up to the first double CRLF:
    const http_header = socket.receiveUntilMatch(alloc, "\r\n\r\n") catch {
        std.debug.print("{s}\n", .{try socket.getLastErrorText(alloc)});
        return;
    };

    // Close the connection with the server
    // Wait a max of 20 seconds (20000 millsec)
    try socket.close(20000);

    // Display the session log:
    std.debug.print("{s}\n", .{try socket.getSessionLog(alloc)});

    // Show the HTTP response header:
    std.debug.print("{s}\n", .{http_header});
}