Xbase++

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()

Xbase++

LOCAL nSuccess
LOCAL oRest
LOCAL oWs
LOCAL cResponseBody
LOCAL nStatusCode
LOCAL nFinalFrame
LOCAL cReceivedStr

nSuccess := 0

//  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.
oRest := CreateObject("Chilkat.Rest")
nSuccess := oRest:Connect("192.168.1.35", 80, 0, 0)
IF (nSuccess != 1)
    ? oRest:LastErrorText
    oRest:destroy()
    RETURN
ENDIF

oWs := CreateObject("Chilkat.WebSocket")

//  Tell the WebSocket to use this connection.
nSuccess := oWs:UseConnection(oRest)
IF (nSuccess != 1)
    ? oWs:LastErrorText
    oRest:destroy()
    oWs:destroy()
    RETURN
ENDIF

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

//  Now send the GET request to /websockets.
cResponseBody := oRest:FullRequestNoBody("GET", "/websockets")
IF (oRest:LastMethodSuccess != 1)
    ? oRest:LastErrorText
    oRest:destroy()
    oWs:destroy()
    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..)
nStatusCode := oRest:ResponseStatusCode
? "Response status code: " + Str(nStatusCode)

IF (nStatusCode != 101)
    ? cResponseBody
    ? "-- Failed because of unexpected response status code."
    oRest:destroy()
    oWs:destroy()
    RETURN
ENDIF

//  We have the expected 101 response, so let's now validate the 
//  contents of the response.
nSuccess := oWs:ValidateServerHandshake()
IF (nSuccess != 1)
    ? oWs:LastErrorText
    oRest:destroy()
    oWs:destroy()
    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.
nFinalFrame := 1
nSuccess := oWs:SendFrame("http.controller_login:username=xxx&password=xxxxx", nFinalFrame)
IF (nSuccess != 1)
    ? oWs:LastErrorText
    oRest:destroy()
    oWs:destroy()
    RETURN
ENDIF

//  Read an incoming frame.
nSuccess := oWs:ReadFrame()
IF (nSuccess != 1)
    ? "Failed to receive a frame"
    ? "ReadFrame fail reason = " + Str(oWs:ReadFrameFailReason)
    ? oWs:LastErrorText
    oRest:destroy()
    oWs:destroy()
    RETURN
ENDIF

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

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

oRest:destroy()
oWs:destroy()