Use the Autobahnpython class library for RPC (remote process call)
Use the Autobahnpython class library for RPC (remote process call)
Overview:
Remote process call (RPC) is a technology used to communicate between different computers. It allows programs to call remote services on different computers.Autobahnpython is a powerful Python library for RPC.
background:
In a distributed system, it is usually necessary to split each component to different computers.However, communication and calls between different computers may become complicated.The RPC uses the underlying level communication details, making the calling remote service on different computers is as simple as calling the local function.
Autobahnpython library:
Autobahnpython is a Python class library for realizing WebSocket and RPC.It provides an API that is easy to use to create RPC clients and servers, and can integrate with various remote process call protocols (such as JSON-RPC, MESSAGEPACK-RPC, etc.).The following is a simple example of using Autobahnpython to implement RPC.
Installation:
First, install the Autobahnpython library with the PIP command:
pip install autobahn
Write the RPC server code:
In the code of the RPC server, we need to import the dependencies of `Autobahn.twisted` and` Twisted` modules as the Autobahnpython library.
python
from twisted.internet import reactor
from autobahn.twisted.websocket import WebSocketServerProtocol, WebSocketServerFactory
class MyRPCServerProtocol(WebSocketServerProtocol):
def onConnect(self, request):
print("Client connected: {0}".format(request.peer))
def onMessage(self, payload, isBinary):
# RPC request and return the result
result = self._processRPCRequest(payload)
self.sendMessage(result)
def onClose(self, wasClean, code, reason):
print("WebSocket connection closed: {0}".format(reason))
def _processRPCRequest(self, request):
#The logic of processing RPC request
# Here you can customize according to actual needs
return "RPC response"
if __name__ == '__main__':
factory = WebSocketServerFactory()
factory.protocol = MyRPCServerProtocol
reactor.listenTCP(9000, factory)
reactor.run()
In the above code, we created a class called MyrpcServerProtocol, which inherited from WebsocketServerProtocol.In this class, we have implemented methods of onConnect (), onMessage (), and onClose () to handle events of connection establishment, RPC requests and connecting off._ProcessrpcRequest () method is used to process the logic of RPC requests and return the response.
Write the RPC client code:
In the code of the RPC client, the `Autobahn.twisted` and` Twisted` modules are also needed.
python
from twisted.internet import reactor
from autobahn.twisted.websocket import WebSocketClientProtocol, WebSocketClientFactory
class MyRPCClientProtocol(WebSocketClientProtocol):
def onConnect(self, response):
print("Server connected: {0}".format(response.peer))
def onOpen(self):
# Send RPC request
self.sendMessage("RPC request")
def onMessage(self, payload, isBinary):
# RPC response
print("Received RPC response: {0}".format(payload))
def onClose(self, wasClean, code, reason):
print("WebSocket connection closed: {0}".format(reason))
if __name__ == '__main__':
factory = WebSocketClientFactory()
factory.protocol = MyRPCClientProtocol
reactor.connectTCP("localhost", 9000, factory)
reactor.run()
In the above code, we created a class called MyrpclientProtocol, which also inherited from WebSocketClientProtocol.In this class, we have implemented methods such as onConnect (), onopen (), onMessage (), and onClose () to process events where connection establishment, sending RPC requests, processing RPC response and connection closure.
Run code:
To run the above code, you first need to start the RPC server.Enter the directory where the RPC server code is located in the command line, and run the following command:
python server.py
Then, start the RPC client.Enter the directory where the RPC client code is located in the command line, and run the following command:
python client.py
After the above command is executed, the RPC client will establish and send RPC requests with the RPC server. The server will process the request and return the response.The client will print out the received RPC response.
Summarize:
By using the Autobahnpython library, we can easily implement the RPC function, making communication between different computers simple and efficient.The above example code gives a basic implementation of an RPC server and client, and you can customize according to actual needs.Reading Autobahnpython document can help you learn more about its functions and configurations.
