Tcl

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()

Tcl

load ./chilkat.dll

set success 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.
set rest [new_CkRest]

set success [CkRest_Connect $rest "192.168.1.35" 80 0 0]
if {$success != 1} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    exit
}

set ws [new_CkWebSocket]

# Tell the WebSocket to use this connection.
set success [CkWebSocket_UseConnection $ws $rest]
if {$success != 1} then {
    puts [CkWebSocket_lastErrorText $ws]
    delete_CkRest $rest
    delete_CkWebSocket $ws
    exit
}

# Add the standard WebSocket open handshake headers that will be needed.
# (This adds the required HTTP request headers to the rest object.)
CkWebSocket_AddClientHeaders $ws

# Now send the GET request to /websockets.
set responseBody [CkRest_fullRequestNoBody $rest "GET" "/websockets"]
if {[CkRest_get_LastMethodSuccess $rest] != 1} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    delete_CkWebSocket $ws
    exit
}

# 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..)
set statusCode [CkRest_get_ResponseStatusCode $rest]
puts "Response status code: $statusCode"

if {$statusCode != 101} then {
    puts "$responseBody"
    puts "-- Failed because of unexpected response status code."
    delete_CkRest $rest
    delete_CkWebSocket $ws
    exit
}

# We have the expected 101 response, so let's now validate the 
# contents of the response.
set success [CkWebSocket_ValidateServerHandshake $ws]
if {$success != 1} then {
    puts [CkWebSocket_lastErrorText $ws]
    delete_CkRest $rest
    delete_CkWebSocket $ws
    exit
}

puts "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.
set finalFrame 1
set success [CkWebSocket_SendFrame $ws "http.controller_login:username=xxx&password=xxxxx" $finalFrame]
if {$success != 1} then {
    puts [CkWebSocket_lastErrorText $ws]
    delete_CkRest $rest
    delete_CkWebSocket $ws
    exit
}

# Read an incoming frame.
set success [CkWebSocket_ReadFrame $ws]
if {$success != 1} then {
    puts "Failed to receive a frame"
    puts "ReadFrame fail reason = [CkWebSocket_get_ReadFrameFailReason $ws]"
    puts [CkWebSocket_lastErrorText $ws]
    delete_CkRest $rest
    delete_CkWebSocket $ws
    exit
}

# Show the string that was received.
set receivedStr [CkWebSocket_getFrameData $ws]
puts "Received: $receivedStr"

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

delete_CkRest $rest
delete_CkWebSocket $ws