Exception Handling with ThreadedWebsocketManager in Python-Binance

When using “python-binance” “ThreadedWebsocketManager”, exception handling can be difficult due to its asynchronous nature and lack of direct access to error messages. However, there are several ways to handle exceptions efficiently.

Why are exceptions difficult to catch?

ThreadedWebsocketManager is designed for internal error handling, which means you don’t have direct access to the error message. If an exception occurs, Binance will push it to the call stack and you won’t get any information about what went wrong.

1. solution: wrap the try except block

One simple way is to wrap the code in a “try” – “except” block, like this:

import thread
binance import ThreadedWebsocketManager





Create an instance of ThreadedWebsocketManager
manager = ThreadedWebsocketManager()
def handle_exceptions():
try:

The code that can throw an exception is shown here
input
except exception like e:
print(f"Error: {e}")

Start the handler in a separate thread
thread = thread.Thread(target=exception_handle)
thread.start()

This will catch any exceptions thrown by ThreadedWebsocketManager and print an error message. Note, however, that this approach may not provide much information about what went wrong.

2. Solution: Use a custom exception handler

Another approach is to create a custom exception handler that catches specific exceptions and prints the necessary information.

import logger

Create a logger
logger = logging.getLogger(__name__)
def handle_exceptions():
try:

The code that could throw an exception is shown here
input
except ThreadedWebsocketManager.ConnectionException like e:
logger.error(f"Connection Exception: {e}")
except exception like e:
logger.error(f"Another Exception: {e}")

Start the management in a separate thread
thread = thread.Thread(target=exception_handle)
thread.start()

This will catch both ThreadedWebsocketManager.ConnectionException and any other exceptions thrown by ThreadedWebsocketManager and print the appropriate information about what went wrong.

Solution 3: Use a logging handler

You can also use a custom logging handler to collect error messages from ThreadedWebsocketManager. Here is an example:

import thread
import log

Create a logger
logger = logging.getLogger(__name__)
class ThreadedWebsocketManagerLogger(logging.Handler):
def emit(self, log):
try:

The code that can throw an exception is shown here
input
except for an exception like e:
super().emit(log)

Create and run the logger
logger = ThreadedWebsocketManagerLogger()
thread = thread.Thread(target=lambda: logger.handle())
thread.start()

The remaining code...

This collects the error messages from ThreadedWebsocketManager to a log file.

Conclusion

While there is no direct way to access exception information using ThreadedWebsocketManager, there are various ways you can use to handle exceptions efficiently. Wrapping your code in try-except blocks or creating custom exception handlers are simple solutions, while using log handlers provides more flexibility and control. Choose the approach that best suits your needs.