(Lianja) 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()

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// 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.
loRest = createobject("CkRest")
llSuccess = loRest.Connect("192.168.1.35",80,.F.,.F.)
if (llSuccess <> .T.) then
    ? loRest.LastErrorText
    release loRest
    return
endif

loWs = createobject("CkWebSocket")

// Tell the WebSocket to use this connection.
llSuccess = loWs.UseConnection(loRest)
if (llSuccess <> .T.) then
    ? loWs.LastErrorText
    release loRest
    release loWs
    return
endif

// Add the standard WebSocket open handshake headers that will be needed.
// (This adds the required HTTP request headers to the rest object.)
loWs.AddClientHeaders()

// Now send the GET request to /websockets.
lcResponseBody = loRest.FullRequestNoBody("GET","/websockets")
if (loRest.LastMethodSuccess <> .T.) then
    ? loRest.LastErrorText
    release loRest
    release loWs
    return
endif

// 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..)
lnStatusCode = loRest.ResponseStatusCode
? "Response status code: " + str(lnStatusCode)

if (lnStatusCode <> 101) then
    ? lcResponseBody
    ? "-- Failed because of unexpected response status code."
    release loRest
    release loWs
    return
endif

// We have the expected 101 response, so let's now validate the 
// contents of the response.
llSuccess = loWs.ValidateServerHandshake()
if (llSuccess <> .T.) then
    ? loWs.LastErrorText
    release loRest
    release loWs
    return
endif

? "WebSocket connection successful."

// 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.
llFinalFrame = .T.
llSuccess = loWs.SendFrame("http.controller_login:username=xxx&password=xxxxx",llFinalFrame)
if (llSuccess <> .T.) then
    ? loWs.LastErrorText
    release loRest
    release loWs
    return
endif

// Read an incoming frame.
llSuccess = loWs.ReadFrame()
if (llSuccess <> .T.) then
    ? "Failed to receive a frame"
    ? "ReadFrame fail reason = " + str(loWs.ReadFrameFailReason)
    ? loWs.LastErrorText
    release loRest
    release loWs
    return
endif

// Show the string that was received.
lcReceivedStr = loWs.GetFrameData()
? "Received: " + lcReceivedStr

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


release loRest
release loWs