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-t COUNT, --threads=COUNT the number of threads to use (120) [default 7] -v, --verbose -d, --debug
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Make sure you try running the program with the debug ag set so that you can check that the threads are started up and that each one does its share of the work A solution is provided in xmlsummarypy, which is slightly more than 100 lines and uses no explicit locks
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Networking
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Creating a TCP Client Creating a TCP Server
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Networking allows computer programs to communicate with each other, even if they are running on different machines For programs such as web browsers, this is the essence of what they do, whereas for others networking adds additional dimensions to their functionality, for example, remote operation or logging, or the ability to retrieve or supply data to other machines Most networking programs work on either a peer-to-peer basis (the same program runs on different machines), or more commonly, a client/server basis (client programs send requests to a server) In this chapter we will create a basic client/server application Such applications are normally implemented as two separate programs: a server that waits for and responds to requests, and one or more clients that send requests to the server and read back the server s response For this to work, the clients must know where to connect to the server, that is, the server s IP (Internet Protocol) address and port number Also, both clients and server must send and receive data using an agreed-upon protocol using data formats that they both understand Python s low-level socket module (on which all of Python s higher-level networking modules are based) supports both IPv4 and IPv6 addresses It also supports the most commonly used networking protocols, including UDP (User Datagram Protocol),a lightweight but unreliable connectionless protocol where data is sent as discrete packets (datagrams) but with no guarantee that they will arrive, and TCP (Transmission Control Protocol), a reliable connectionand stream-oriented protocol With TCP, any amount of data can be sent and received the socket is responsible for breaking the data into chunks that are small enough to send, and for reconstructing the data at the other end
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Machines can also connect using service discovery, for example, using the bonjour API; suitable modules are available from the Python Package Index, pypipythonorg/pypi
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11 Networking
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UDP is often used to monitor instruments that give continuous readings, and where the odd missed reading is not signi cant, and it is sometimes used for audio or video streaming in cases where the occasional missed frame is acceptable Both the FTP and the HTTP protocols are built on top of TCP, and client/server applications normally use TCP because they need connection-oriented communication and the reliability that TCP provides In this chapter we will develop a client/server program, so we use TCP Another decision that must be made is whether to send and receive data as lines of text or as blocks of binary data, and if the latter, in what form In this chapter we use blocks of binary data where the rst four bytes are the length of the following data (encoded as an unsigned integer using the struct module), and where the following data is a binary pickle The advantage of this approach is that we can use the same sending and receiving code for any application since we can store almost any arbitrary data in a pickle The disadvantage is that both client and server must understand pickles, so they must be written in Python or must be able to access Python, for example, using Jython in Java or BoostPython in C++ And of course, the usual security considerations apply to the use of pickles The example we will use is a car registration program The server holds details of car registrations (license plate, seats, mileage, and owner) The client is used to retrieve car details, to change a car s mileage or owner, or to create a new car registration Any number of clients can be used and they won t block each other, even if two access the server at the same time This is because the server hands off each client s request to a separate thread (We will also see that it is just as easy to use separate processes) For the sake of the example, we will run the server and clients on the same machine; this means that we can use localhost as the IP address (although if the server is on another machine the client can be given its IP address on the command line and this will work as long as there is no rewall in the way) We have also chosen an arbitrary port number of 9653 The port number should be greater than 1023 and is normally between 5001 and 32767, although port numbers up to 65535 are normally valid The server can accept ve kinds of requests: GET_CAR_DETAILS, CHANGE_MILEAGE,
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