(Swift 3,4,5...) Debugging with Socket Session Logging

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.

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

    let socket = CkoSocket()!

    // Enable session logging:
    socket.keepSessionLog = true
    socket.sessionLogEncoding = "esc"

    // To demonstrate session logging, we'll connect to an
    // HTTP server and download the HTTP response header:
    var ssl: Bool = false
    var maxWaitMillisec: Int = 20000
    var success: Bool = socket.connect("www.chilkatsoft.com", port: 80, ssl: ssl, maxWaitMs: maxWaitMillisec)
    if success != true {
        print("\(socket.lastErrorText!)")
        return
    }

    // Set maximum timeouts for reading an writing (in millisec)
    socket.maxReadIdleMs = 10000
    socket.maxSendIdleMs = 10000

    // The socket component includes a BuildHttpGetRequest
    // method for convenience. Build a GET and send it to 
    // the web server:
    var httpGet: String?
    httpGet = socket.buildHttpGetRequest("http://www.chilkatsoft.com/")

    // Send it...
    success = socket.send(httpGet)
    if success != true {
        print("\(socket.lastErrorText!)")
        return
    }

    // Read the response up to the first double CRLF:
    var httpHeader: String? = socket.receive(untilMatch: "\r\n\r\n")
    if socket.lastMethodSuccess != true {
        print("\(socket.lastErrorText!)")
        return
    }

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

    // Display the session log:
    print("\(socket.sessionLog!)")

    // Show the HTTP response header:
    print("\(httpHeader!)")

}