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CHAPTER 2 UDP
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world itself gives us no way to distinguish between something that we cannot detect and something that does not exist! So the best that the client can do is give up once it has made enough attempts. Kill the server process, and try running the client again: $ python udp_remote.py client guinness Waiting up to 0.1 seconds for a reply Waiting up to 0.2 seconds for a reply Waiting up to 0.4 seconds for a reply Waiting up to 0.8 seconds for a reply Waiting up to 1.6 seconds for a reply Traceback (most recent call last): ... RuntimeError: I think the server is down Of course, giving up makes sense only if your program is trying to perform some brief task and needs to produce output or return some kind of result to the user. If you are writing a daemon program that runs all day like, say, a weather icon in the corner of the screen that displays the temperature and forecast fetched from a remote UDP service then it is fine to have code that keeps re-trying forever. After all, the desktop or laptop machine might be off the network for long periods of time, and your code might have to patiently wait for hours or days until the forecast server can be contacted again. If you are writing daemon code that re-tries all day, then do not adhere to a strict exponential backoff, or you will soon have ramped the delay up to a value like two hours, and then you will probably miss the entire half-hour period during which the laptop owner sits down in a coffee shop and you could actually have gotten to the network! Instead, choose some maximum delay like, say, five minutes and once the exponential backoff has reached that period, keep it there, so that you are always guaranteed to attempt an update once the user has been on the network for five minutes after a long time disconnected. Of course, if your operating system lets your process be signaled for events like the network coming back up, then you will be able to do much better than to play with timers and guess about when the network might come back! But system-specific mechanisms like that are, sadly, beyond the scope of this book, so let s now return to UDP and a few more issues that it raises.
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Connecting UDP Sockets
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Listing 2 2, which we examined in the previous section, introduced another new concept that needs explanation. We have already discussed binding both the explicit bind() call that the server uses to grab the port number that it wants to use, as well as the implicit binding that takes place when the client first tries to use the socket and is assigned a random ephemeral port number by the operating system. But this remote UDP client also uses a new call that we have not discussed before: the connect() socket operation. You can see easily enough what it does. Instead of having to use sendto() and an explicit UDP address every time we want to send something to the server, the connect() call lets the operating system know ahead of time which remote address to which we want to send packets, so that we can simply supply data to the send() call and not have to repeat the server address again. But connect() does something else important, which will not be obvious at all from reading the Listing 2 2 script. To approach this topic, let us return to Listing 2 1 for a moment. You will recall that both its client and server use the loopback IP address and assume reliable delivery the client will wait forever for a response. Try running the client from Listing 2 1 in one window: $ python udp_local.py client Address before sending: ('0.0.0.0', 0) Address after sending ('0.0.0.0', 47873)
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