Python websocket create_connection example

Python websocket create_connection example

Here is an example of how to use the create_connection() function from the websockets module in Python:

import asyncio
import websockets
async def create_connection():
uri = "ws://localhost:8765"
Use a context manager to automatically close the connection when we're done
with await websockets.connect(uri) as ws:
while True:
try:
Send a message to the server
await ws.send("Hello, world!")
Receive messages from the server
msg = await ws.recv()
print(f"Received: {msg}")
if msg == "goodbye":
break
except websockets.ConnectionClosed:
print("Connection closed")
return
asyncio.run(create_connection())

In this example, we are establishing a WebSocket connection to the server at ws://localhost:8765. This connection is managed automatically by the websockets module when you use it with a context manager (the with statement).

When we have established the connection, we enter an infinite loop where we send and receive messages. We start by sending the message "Hello, world!" to the server.

Then, we continuously receive messages from the server until we receive the message "goodbye". At that point, we break out of the loop and close the connection.

Finally, we use asyncio.run() to run our example as a standalone program. This is equivalent to calling the top-level event loop's run_until_complete() method.

It is important to note that this example assumes that there is an active WebSocket server at the specified URI. If no such server exists, then your program will fail when it tries to establish the connection.

Python websocket create_connection timeout

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In Python, when creating a WebSocket connection using the websocket library, it's common to set a timeout value to prevent the script from waiting indefinitely for a connection to establish or data to be sent/received.

Here are some key points to consider:

Why Set a Timeout?

When establishing a WebSocket connection, there may be various reasons why the connection might not be established promptly. For example:

Creating a Connection with Timeout

In Python's websocket library, you can set a timeout value for creating a connection using the create_connection() function. The timeout parameter specifies the maximum time (in seconds) that the script should wait for the connection to be established.

Here's an example:

import websocket
ws_url = "wss://example.com/ws"
try:
ws = websocket.create_connection(ws_url, timeout=5)
except websocket.WebSocketTimeoutException as e:
print(f"Connection timed out: {e}")

In this example:

Handling Connection Establishment Errors

When a timeout occurs, you can handle the error by:

Here's an example of how you could re-establish the connection:

import websocket
import time
ws_url = "wss://example.com/ws"
for i in range(3):  # retry up to 3 times
try:
ws = websocket.create_connection(ws_url, timeout=5)
break
except websocket.WebSocketTimeoutException as e:
print(f"Connection timed out: {e}")
time.sleep(1)  # wait for a second before retrying
if not ws:
print("Failed to establish connection. Exiting.")

In this example:

By setting a timeout value and handling connection establishment errors, you can ensure that your Python WebSocket client is robust and can effectively handle unexpected issues.