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21 Network Programming and Sockets
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method If any task exits (StopIteration), it is discarded If a task merely yields, it is just placed back onto the task queue so that it can run againThis continues until there are either no more tasks or all tasks are blocked, waiting for more I/O events As an option, the mainloop() function accepts a count parameter that can be used to make it return after a specified number of I/O polling operations This might be useful if the scheduler is to be integrated into another event loop Perhaps the most subtle aspect of the scheduler is the handling of SystemCall instances in the mainloop() method If a task yields a SystemCall instance, the scheduler invokes its handle() method, passing in the associated Scheduler and Task objects as parametersThe purpose of a system call is to carry out some kind of internal operation concerning tasks or the scheduler itselfThe ReadWait(), WriteWait(), and NewTask() classes are examples of system calls that suspend a task for I/O or create a new task For example, ReadWait() takes a task and invokes the readwait() method on the schedulerThe scheduler then takes the task and places it into an appropriate holding area Again, there is a critical decoupling of objects going on hereTasks yield SystemCall objects to request service, but do not directly interact with the scheduler SystemCall objects, in turn, can perform operations on tasks and schedulers but are not tied to any specific scheduler or task implementation So, in theory, you could write a completely different scheduler implementation (maybe using threads) that could just be plugged into this whole framework and it would still work
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Here is an example of a simple network time server implemented using this I/O task scheduler It will illuminate many of the concepts described in the previous list:
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from socket import socket, AF_INET, SOCK_STREAM def time_server(address): import time s = socket(AF_INET,SOCK_STREAM) sbind(address) slisten(5) while True: yield ReadWait(s) conn,addr = saccept() print("Connection from %s" % str(addr)) yield WriteWait(conn) resp = timectime() + "\r\n" connsend(respencode('latin-1')) connclose() sched = Scheduler() schednew(time_server(('',10000))) schednew(time_server(('',11000))) schedrun()
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# Server on port 10000 # Server on port 11000
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In this example, two different servers are running concurrently each listening on a different port number (use telnet to connect and test)The yield ReadWait() and yield WriteWait() statements cause the coroutine running each server to suspend until I/O is possible on the associated socketWhen these statements return, the code immediately proceeds with an I/O operation such as accept() or send()
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The use of ReadWait and WriteWait might look rather low-level Fortunately, our design allows these operations to be hidden behind library functions and methods provided that they are also coroutines Consider the following object that wraps a socket object and mimics its interface:
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class CoSocket(object): def _ _init_ _(self,sock): selfsock = sock def close(self): yield selfsockclose() def bind(self,addr): yield selfsockbind(addr) def listen(self,backlog): yield selfsocklisten(backlog) def connect(self,addr): yield WriteWait(selfsock) yield selfsockconnect(addr) def accept(self): yield ReadWait(selfsock) conn, addr = selfsockaccept() yield CoSocket(conn), addr def send(self,bytes): while bytes: evt = yield WriteWait(selfsock) nsent = selfsocksend(bytes) bytes = bytes[nsent:] def recv(self,maxsize): yield ReadWait(selfsock) yield selfsockrecv(maxsize)
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Here is a reimplementation of the time server using the CoSocket class:
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from socket import socket, AF_INET, SOCK_STREAM def time_server(address): import time s = CoSocket(socket(AF_INET,SOCK_STREAM)) yield sbind(address) yield slisten(5) while True: conn,addr = yield saccept() print(conn) print("Connection from %s" % str(addr)) resp = timectime()+"\r\n" yield connsend(respencode('latin-1')) yield connclose() sched = Scheduler() schednew(time_server(('',10000))) schednew(time_server(('',11000))) schedrun()
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# Server on port 10000 # Server on port 11000
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In this example, the programming interface of a CoSocket object looks a lot like a normal socketThe only difference is that every operation must be prefaced with yield (since every method is defined as a coroutine) At first, it looks crazy so you might ask what does all of this madness buy you If you run the above server, you will find that it is able to run concurrently without using threads or subprocesses Not only that, it has normal looking control flow as long as you ignore all of the yield keywords
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