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� Z Gd% d � d e � Z Gd& d � d e � Z d S(' u� Generic socket server classes.
This module tries to capture the various aspects of defining a server:
For socket-based servers:
- address family:
- AF_INET{,6}: IP (Internet Protocol) sockets (default)
- AF_UNIX: Unix domain sockets
- others, e.g. AF_DECNET are conceivable (see <socket.h>
- socket type:
- SOCK_STREAM (reliable stream, e.g. TCP)
- SOCK_DGRAM (datagrams, e.g. UDP)
For request-based servers (including socket-based):
- client address verification before further looking at the request
(This is actually a hook for any processing that needs to look
at the request before anything else, e.g. logging)
- how to handle multiple requests:
- synchronous (one request is handled at a time)
- forking (each request is handled by a new process)
- threading (each request is handled by a new thread)
The classes in this module favor the server type that is simplest to
write: a synchronous TCP/IP server. This is bad class design, but
save some typing. (There's also the issue that a deep class hierarchy
slows down method lookups.)
There are five classes in an inheritance diagram, four of which represent
synchronous servers of four types:
+------------+
| BaseServer |
+------------+
|
v
+-----------+ +------------------+
| TCPServer |------->| UnixStreamServer |
+-----------+ +------------------+
|
v
+-----------+ +--------------------+
| UDPServer |------->| UnixDatagramServer |
+-----------+ +--------------------+
Note that UnixDatagramServer derives from UDPServer, not from
UnixStreamServer -- the only difference between an IP and a Unix
stream server is the address family, which is simply repeated in both
unix server classes.
Forking and threading versions of each type of server can be created
using the ForkingMixIn and ThreadingMixIn mix-in classes. For
instance, a threading UDP server class is created as follows:
class ThreadingUDPServer(ThreadingMixIn, UDPServer): pass
The Mix-in class must come first, since it overrides a method defined
in UDPServer! Setting the various member variables also changes
the behavior of the underlying server mechanism.
To implement a service, you must derive a class from
BaseRequestHandler and redefine its handle() method. You can then run
various versions of the service by combining one of the server classes
with your request handler class.
The request handler class must be different for datagram or stream
services. This can be hidden by using the request handler
subclasses StreamRequestHandler or DatagramRequestHandler.
Of course, you still have to use your head!
For instance, it makes no sense to use a forking server if the service
contains state in memory that can be modified by requests (since the
modifications in the child process would never reach the initial state
kept in the parent process and passed to each child). In this case,
you can use a threading server, but you will probably have to use
locks to avoid two requests that come in nearly simultaneous to apply
conflicting changes to the server state.
On the other hand, if you are building e.g. an HTTP server, where all
data is stored externally (e.g. in the file system), a synchronous
class will essentially render the service "deaf" while one request is
being handled -- which may be for a very long time if a client is slow
to read all the data it has requested. Here a threading or forking
server is appropriate.
In some cases, it may be appropriate to process part of a request
synchronously, but to finish processing in a forked child depending on
the request data. This can be implemented by using a synchronous
server and doing an explicit fork in the request handler class
handle() method.
Another approach to handling multiple simultaneous requests in an
environment that supports neither threads nor fork (or where these are
too expensive or inappropriate for the service) is to maintain an
explicit table of partially finished requests and to use select() to
decide which request to work on next (or whether to handle a new
incoming request). This is particularly important for stream services
where each client can potentially be connected for a long time (if
threads or subprocesses cannot be used).
Future work:
- Standard classes for Sun RPC (which uses either UDP or TCP)
- Standard mix-in classes to implement various authentication
and encryption schemes
- Standard framework for select-based multiplexing
XXX Open problems:
- What to do with out-of-band data?
BaseServer:
- split generic "request" functionality out into BaseServer class.
Copyright (C) 2000 Luke Kenneth Casson Leighton <lkcl@samba.org>
example: read entries from a SQL database (requires overriding
get_request() to return a table entry from the database).
entry is processed by a RequestHandlerClass.
u 0.4i Nu TCPServeru UDPServeru ForkingUDPServeru ForkingTCPServeru ThreadingUDPServeru ThreadingTCPServeru BaseRequestHandleru StreamRequestHandleru DatagramRequestHandleru ThreadingMixInu ForkingMixInu AF_UNIXu UnixStreamServeru UnixDatagramServeru ThreadingUnixStreamServeru ThreadingUnixDatagramServerc G sX xQ y | | � SWq t k
rP } z | j t j k r> � n WYd d } ~ Xq Xq d S( u* restart a system call interrupted by EINTRN( u OSErroru errnou EINTR( u funcu argsu e( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu _eintr_retry� s u _eintr_retryc B s� | Ee Z d Z d Z d! Z d d � Z d d � Z d d d � Z d d
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BaseServeru� Base class for server classes.
Methods for the caller:
- __init__(server_address, RequestHandlerClass)
- serve_forever(poll_interval=0.5)
- shutdown()
- handle_request() # if you do not use serve_forever()
- fileno() -> int # for select()
Methods that may be overridden:
- server_bind()
- server_activate()
- get_request() -> request, client_address
- handle_timeout()
- verify_request(request, client_address)
- server_close()
- process_request(request, client_address)
- shutdown_request(request)
- close_request(request)
- service_actions()
- handle_error()
Methods for derived classes:
- finish_request(request, client_address)
Class variables that may be overridden by derived classes or
instances:
- timeout
- address_family
- socket_type
- allow_reuse_address
Instance variables:
- RequestHandlerClass
- socket
c C s. | | _ | | _ t j � | _ d | _ d S( u/ Constructor. May be extended, do not override.NF( u server_addressu RequestHandlerClassu threadingu Eventu _BaseServer__is_shut_downu Falseu _BaseServer__shutdown_request( u selfu server_addressu RequestHandlerClass( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu __init__� s u BaseServer.__init__c C s d S( uS Called by constructor to activate the server.
May be overridden.
N( ( u self( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu server_activate� s u BaseServer.server_activateg �?c C s� | j j � z^ xW | j si t t j | g g g | � \ } } } | | k r\ | j � n | j � q WWd d | _ | j j � Xd S( u� Handle one request at a time until shutdown.
Polls for shutdown every poll_interval seconds. Ignores
self.timeout. If you need to do periodic tasks, do them in
another thread.
NF( u _BaseServer__is_shut_downu clearu _BaseServer__shutdown_requestu _eintr_retryu selectu _handle_request_noblocku service_actionsu Falseu set( u selfu
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u BaseServer.serve_foreverc C s d | _ | j j � d S( u� Stops the serve_forever loop.
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needs to be run during the loop.
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Respects self.timeout.
i N( u socketu
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u BaseServer.handle_requestc C s� y | j � \ } } Wn t j k
r1 d SYn X| j | | � r� y | j | | � Wq� | j | | � | j | � Yq� Xn d S( u� Handle one request, without blocking.
I assume that select.select has returned that the socket is
readable before this function was called, so there should be
no risk of blocking in get_request().
N( u get_requestu socketu erroru verify_requestu process_requestu handle_erroru shutdown_request( u selfu requestu client_address( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu _handle_request_noblock% s u" BaseServer._handle_request_noblockc C s d S( uc Called if no new request arrives within self.timeout.
Overridden by ForkingMixIn.
N( ( u self( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu handle_timeout7 s u BaseServer.handle_timeoutc C s d S( un Verify the request. May be overridden.
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T( u True( u selfu requestu client_address( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu verify_request> s u BaseServer.verify_requestc C s! | j | | � | j | � d S( uV Call finish_request.
Overridden by ForkingMixIn and ThreadingMixIn.
N( u finish_requestu shutdown_request( u selfu requestu client_address( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu process_requestF s u BaseServer.process_requestc C s d S( uD Called to clean-up the server.
May be overridden.
N( ( u self( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu server_closeO s u BaseServer.server_closec C s | j | | | � d S( u8 Finish one request by instantiating RequestHandlerClass.N( u RequestHandlerClass( u selfu requestu client_address( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu finish_requestW s u BaseServer.finish_requestc C s | j | � d S( u3 Called to shutdown and close an individual request.N( u
close_request( u selfu request( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu shutdown_request[ s u BaseServer.shutdown_requestc C s d S( u) Called to clean up an individual request.N( ( u selfu request( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu
close_request_ s u BaseServer.close_requestc C sP t d d � t d d d �t | � d d l } | j � t d d � d S( ut Handle an error gracefully. May be overridden.
The default is to print a traceback and continue.
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__module__u __qualname__u __doc__u Noneu timeoutu __init__u server_activateu
serve_foreveru shutdownu service_actionsu handle_requestu _handle_request_noblocku handle_timeoutu verify_requestu process_requestu server_closeu finish_requestu shutdown_requestu
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BaseServer� s" +
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d � Z d d � Z d d � Z d S( u TCPServeru3 Base class for various socket-based server classes.
Defaults to synchronous IP stream (i.e., TCP).
Methods for the caller:
- __init__(server_address, RequestHandlerClass, bind_and_activate=True)
- serve_forever(poll_interval=0.5)
- shutdown()
- handle_request() # if you don't use serve_forever()
- fileno() -> int # for select()
Methods that may be overridden:
- server_bind()
- server_activate()
- get_request() -> request, client_address
- handle_timeout()
- verify_request(request, client_address)
- process_request(request, client_address)
- shutdown_request(request)
- close_request(request)
- handle_error()
Methods for derived classes:
- finish_request(request, client_address)
Class variables that may be overridden by derived classes or
instances:
- timeout
- address_family
- socket_type
- request_queue_size (only for stream sockets)
- allow_reuse_address
Instance variables:
- server_address
- RequestHandlerClass
- socket
i c C sO t j | | | � t j | j | j � | _ | rK | j � | j � n d S( u/ Constructor. May be extended, do not override.N( u
BaseServeru __init__u socketu address_familyu socket_typeu server_bindu server_activate( u selfu server_addressu RequestHandlerClassu bind_and_activate( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu __init__� s
u TCPServer.__init__c C sQ | j r( | j j t j t j d � n | j j | j � | j j � | _ d S( uO Called by constructor to bind the socket.
May be overridden.
i N( u allow_reuse_addressu socketu
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May be overridden.
N( u socketu listenu request_queue_size( u self( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu server_activate� s u TCPServer.server_activatec C s | j j � d S( uD Called to clean-up the server.
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( u socketu accept( u self( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu get_request� s u TCPServer.get_requestc C s= y | j t j � Wn t j k
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c B s_ | Ee Z d Z d Z d Z e j Z d Z d d � Z
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SOCK_DGRAMu socket_typeu max_packet_sizeu get_requestu server_activateu shutdown_requestu
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s, u ForkingMixIn.collect_childrenc C s | j � d S( un Wait for zombies after self.timeout seconds of inactivity.
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N( u collect_children( u self( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu handle_timeout- s u ForkingMixIn.handle_timeoutc C s | j � d S( u� Collect the zombie child processes regularly in the ForkingMixIn.
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N( u collect_children( u self( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu service_actions4 s u ForkingMixIn.service_actionsc C s� t j � } | rN | j d k r- g | _ n | j j | � | j | � d Sy. | j | | � | j | � t j d � Wn: z! | j | | � | j | � Wd t j d � XYn Xd S( u- Fork a new subprocess to process the request.Ni i (
u osu forku active_childrenu Noneu appendu
close_requestu finish_requestu shutdown_requestu _exitu handle_error( u selfu requestu client_addressu pid( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu process_request; s
u ForkingMixIn.process_requestN( u __name__u
__module__u __qualname__u __doc__u timeoutu Noneu active_childrenu max_childrenu collect_childrenu handle_timeoutu service_actionsu process_request( u
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In addition, exception handling is done here.
N( u finish_requestu shutdown_requestu handle_error( u selfu requestu client_address( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu process_request_thread[ s u% ThreadingMixIn.process_request_threadc C s; t j d | j d | | f � } | j | _ | j � d S( u* Start a new thread to process the request.u targetu argsN( u threadingu Threadu process_request_threadu daemon_threadsu daemonu start( u selfu requestu client_addressu t( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu process_requesth s u ThreadingMixIn.process_requestNF( u __name__u
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S( u BaseRequestHandleru� Base class for request handler classes.
This class is instantiated for each request to be handled. The
constructor sets the instance variables request, client_address
and server, and then calls the handle() method. To implement a
specific service, all you need to do is to derive a class which
defines a handle() method.
The handle() method can find the request as self.request, the
client address as self.client_address, and the server (in case it
needs access to per-server information) as self.server. Since a
separate instance is created for each request, the handle() method
can define arbitrary other instance variariables.
c
C sE | | _ | | _ | | _ | j � z | j � Wd | j � Xd S( N( u requestu client_addressu serveru setupu handleu finish( u selfu requestu client_addressu server( ( u1 /opt/alt/python33/lib64/python3.3/socketserver.pyu __init__� s
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