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Viewing changes to effbot/org/http_manager.py

  • Committer: Martin Pool
  • Date: 2005-03-12 08:54:12 UTC
  • Revision ID: mbp@sourcefrog.net-20050312085412-13373aa129ccbad3
doc: notes on implementing codeville-style merge on
top of a weave; looks nice but opens a can of worms

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effbot/org/http_manager.py
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# $Id: http_manager.py 270 2004-10-09 10:38:54Z fredrik $
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# effnews http
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#
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# manage a set of http clients
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#
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# Copyright (c) 2001-2004 by Fredrik Lundh.  All rights reserved.
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#
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import asyncore, time
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import http_client
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class http_manager:
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    max_connections = 8
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    max_size = 1000000
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    max_time = 60
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    def __init__(self):
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        self.queue = []
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    def request(self, uri, consumer, extra_headers=None):
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        self.queue.append((uri, consumer, extra_headers))
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    def priority_request(self, uri, consumer, extra_headers=None):
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        self.queue.insert(0, (uri, consumer, extra_headers))
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    def purge(self):
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        for channel in asyncore.socket_map.values():
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            channel.close()
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        del self.queue[:]
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    def prioritize(self, priority_uri):
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        i = 0
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        for uri, consumer, extra_headers in self.queue:
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            if uri == priority_uri:
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                del self.queue[i]
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                self.priority_request(uri, consumer, extra_headers)
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                return
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            i = i + 1
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    def poll(self, timeout=0.1):
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        # sanity checks
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        now = time.time()
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        for channel in asyncore.socket_map.values():
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            if channel.bytes_in > self.max_size:
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                channel.close() # too much data
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                try:
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                    channel.consumer.http(
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                        0, channel, ("HTTPManager", "too much data", None)
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                        )
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                except:
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                    pass
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            if channel.timestamp and now - channel.timestamp > self.max_time:
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                channel.close() # too slow
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                try:
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                    channel.consumer.http(
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                        0, channel, ("HTTPManager", "timeout", None)
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                        )
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                except:
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                    pass
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        # activate up to max_connections channels
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        while self.queue and len(asyncore.socket_map) < self.max_connections:
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            http_client.do_request(*self.queue.pop(0))
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        # keep the network running
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        asyncore.poll(timeout)
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        # return non-zero if we should keep on polling
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        return len(self.queue) or len(asyncore.socket_map)