Error processing and debugging skills in the Autobahnpython Library
Autobahn is a Python class library for WebSockets and WAMP (Web Application Messaging Protocol).During the development process, error processing and debugging skills are very important. They can help us quickly discover problems and solve them.This article will introduce the error processing and debugging techniques in the Autobahnpython library, and provide appropriate programming code and related configuration description.
1. Error processing skills
1. Abnormal processing: When using the Autobahnpython library, we should use the Try-EXCEPT statement to capture and handle abnormalities.This will help us find errors and take appropriate actions at runtime.The following is a basic example of abnormal treatment:
python
try:
# Autobahnpython code
except Exception as e:
# Anomalous processing code
print("Error occurred:", str(e))
2. Error log: Autobahnpython class library provides logging functions. We can use it to record error information and debug information.You can use Python's logging module to configure the logging level and output location to meet personal needs.
python
import logging
from autobahn.util import newid
logging.basicConfig(level=logging.DEBUG, filename='autobahn.log', filemode='w',
format='%(asctime)s - %(levelname)s - %(message)s')
def on_error(error):
logging.error("Error occurred: %s", error)
# Autobahnpython code
Second, debugging skills
1. Print debugging information: Using the value of the print statement in the key position output variables and other debugging information, this is one of the simplest and commonly used debugging techniques.
python
print("Variable value:", variable)
2. Use PDB debugger: The PDB debugger that comes with Python is a powerful tool that can help us check the code by line and find the problem.Insert the PDB.SET_TRACE () statement in the code. When the program runs to that position, it will automatically suspend and enter the PDB debugging mode.
python
import pdb
# Autobahnpython code
def on_message(message):
# Try message in some way
PDB.SET_TRACE () # is suspended and entered PDB debugging mode at this location
# Continue to execute the remaining code
# Autobahnpython code
3. Programming code and related configuration description
In order to demonstrate the error processing and debugging skills, we will use the Autobahnpython library to achieve a simple WebSockets server.
First, we need to install the Autobahnpython library.You can use the following command to install:
pip install autobahn
Next, we define a simple WebSockets server:
python
from twisted.internet import reactor
from twisted.web.static import File
from autobahn.twisted.websocket import WebSocketServerProtocol, WebSocketServerFactory
class MyServerProtocol(WebSocketServerProtocol):
def onConnect(self, request):
print("Client connected: {}".format(request.peer))
def onOpen(self):
print("WebSocket connection open.")
def onMessage(self, payload, isBinary):
print("Message received: {}".format(payload.decode('utf-8')))
def onClose(self, wasClean, code, reason):
print("WebSocket connection closed: {0}".format(reason))
if __name__ == '__main__':
factory = WebSocketServerFactory("ws://localhost:9000")
factory.protocol = MyServerProtocol
reactor.listenTCP(9000, factory)
reactor.run()
In the above code, we define a WebSocket server MyServerprotocol, which inherits from WebsocketServerprotocol.In this category, we can rewrite various methods to handle events such as connection, receiving messages and closing connections.
In order to configure log records, we can add the following code:
python
import logging
from autobahn.util import newid
logging.basicConfig(level=logging.DEBUG, filename='autobahn.log', filemode='w',
format='%(asctime)s - %(levelname)s - %(message)s')
def on_error(error):
logging.error("Error occurred: %s", error)
factory.setProtocolOptions(openHandshakeTimeout=10, closeHandshakeTimeout=1)
factory.setProtocolOptions(failByDrop=True)
By configured logging levels, output files, and formats, we can write error messages into log files.
Through the above error processing and debugging skills, we can better debug the code of the Autobahnpython library, quickly position and solve problems, and improve development efficiency and code quality.
Summarize:
This article introduces the error processing and debugging skills in the Autobahnpython library.By using abnormal processing, error log records, print debugging information, and using PDB debugger and other methods, we can better discover and solve problems.The programming code and related configuration descriptions provide readers to better understand and apply error processing and debugging skills.It is hoped that this article can help developers using the Autobahnpython library.
