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Add the following to the run method. You can about socket options in the Linux manual socket 7. This option allows the server to use the same port after an old connection was closed normally, you would have to wait for a few minutes.
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A Picture is a 1. Just photos, sketches, diagrams or other images to your chat and share them with others. We will need to create an entirely new socket whenever a client connects, in order to send and receive data.
The accept call will wait for a new client to connect and when it does, returns a new connected socket along with the socket address of the connected client. A few more methods to introduce: getpeername returns the socket address on the other end of the connection in this case, the client while getsockname returns the socket address to which the socket object is bound. We need a way to communicate with each individual client, but at the same time, we need to be listening for new connections from other potential clients.
The way we do this is by creating a new ServerSocket thread we will define this later every time a new client connects, and this thread runs alongside the Server thread. The server also needs a way to manage all active client connections, so it stores the active connections as ServerSocket objects in self. The server receives and processes the cat.
The server sends the message to all other connected clients. The clients will display the message in the command line or GUI. We are really sending many unicasts, which are one-to-one transmissions to each individual connected client. Thread We will define the ServerSocket class below.
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Sending and Receiving The ServerSocket class will facilitate communications with individual clients. This time, instead of listening for new connections, we are listening for data sent by the client. When recv is called, it will wait for data to arrive. Calls like accept and recv that make the program wait until some new data has arrived, allowing it to return, are called blocking calls.
Data is sent and received over the network as bytestrings, and hence need to be encoded and decoded using encode and decode respectively. One problem with both send and recv is that there is a slight possibility that only part of the data is sent or received, because the outgoing or incoming buffers are almost full, so it queues whatever data it could, while vhat the rest of the data unprocessed.
This becomes problematic when send returns, but in fact, some of the data is still left unsent. Closed Sockets One thing you would notice in the above code is that we are able to tell if the client has closed its end of mske connection. When the client socket is closed, recv returns an empty string '' immediately, similarly to how read behaves when an end-of-file is reached.
Thus, when we see that recv returns an empty string in the else statementwe close our side of the connection as well, remove the ServerSocket thread from the list of active connections, and end the thread.