+from binascii import b2a_hex
+from urlparse import urlunparse
+import os, re
+
+from twisted.internet import defer
from twisted.web2 import server, http, http_headers
+from twisted.python import log
from apt_dht_conf import config
+from PeerManager import PeerManager
from HTTPServer import TopLevel
+from MirrorManager import MirrorManager
+from Hash import HashObject
+from db import DB
+from util import findMyIPAddr
class AptDHT:
- def __init__(self):
- self.http_server = TopLevel(config.defaults()['cache_dir'], self)
+ def __init__(self, dht):
+ log.msg('Initializing the main apt_dht application')
+ self.db = DB(config.get('DEFAULT', 'cache_dir') + '/.apt-dht.db')
+ self.dht = dht
+ self.dht.loadConfig(config, config.get('DEFAULT', 'DHT'))
+ self.dht.join().addCallbacks(self.joinComplete, self.joinError)
+ self.http_server = TopLevel(config.get('DEFAULT', 'cache_dir'), self)
self.http_site = server.Site(self.http_server)
+ self.peers = PeerManager()
+ self.mirrors = MirrorManager(config.get('DEFAULT', 'cache_dir'), self)
+ self.my_addr = None
def getSite(self):
return self.http_site
+ def joinComplete(self, result):
+ self.my_addr = findMyIPAddr(result, config.getint(config.get('DEFAULT', 'DHT'), 'PORT'))
+ if not self.my_addr:
+ raise RuntimeError, "IP address for this machine could not be found"
+
+ def joinError(self, failure):
+ log.msg("joining DHT failed miserably")
+ log.err(failure)
+
def check_freshness(self, path, modtime, resp):
- return resp
+ log.msg('Checking if %s is still fresh' % path)
+ d = self.peers.get([path], "HEAD", modtime)
+ d.addCallback(self.check_freshness_done, path, resp)
+ return d
+
+ def check_freshness_done(self, resp, path, orig_resp):
+ if resp.code == 304:
+ log.msg('Still fresh, returning: %s' % path)
+ return orig_resp
+ else:
+ log.msg('Stale, need to redownload: %s' % path)
+ return self.get_resp(path)
def get_resp(self, path):
- return http.Response(
- 200,
- {'content-type': http_headers.MimeType('text', 'html')},
- """<html><body>
- <h2>Statistics</h2>
- <p>TODO: eventually this will cause a P2P lookup.</body></html>""")
+ d = defer.Deferred()
+
+ log.msg('Trying to find hash for %s' % path)
+ findDefer = self.mirrors.findHash(path)
+
+ findDefer.addCallbacks(self.findHash_done, self.findHash_error,
+ callbackArgs=(path, d), errbackArgs=(path, d))
+ findDefer.addErrback(log.err)
+ return d
+
+ def findHash_error(self, failure, path, d):
+ log.err(failure)
+ self.findHash_done(HashObject(), path, d)
+
+ def findHash_done(self, hash, path, d):
+ if hash.expected() is None:
+ log.msg('Hash for %s was not found' % path)
+ self.lookupHash_done([], hash, path, d)
+ else:
+ log.msg('Found hash %s for %s' % (hash.hexexpected(), path))
+ # Lookup hash from DHT
+ key = hash.normexpected(bits = config.getint(config.get('DEFAULT', 'DHT'), 'HASH_LENGTH'))
+ lookupDefer = self.dht.getValue(key)
+ lookupDefer.addCallback(self.lookupHash_done, hash, path, d)
+
+ def lookupHash_done(self, locations, hash, path, d):
+ if not locations:
+ log.msg('Peers for %s were not found' % path)
+ getDefer = self.peers.get([path])
+ getDefer.addCallback(self.mirrors.save_file, hash, path)
+ getDefer.addErrback(self.mirrors.save_error, path)
+ getDefer.addCallbacks(d.callback, d.errback)
+ else:
+ log.msg('Found peers for %s: %r' % (path, locations))
+ # Download from the found peers
+ getDefer = self.peers.get(locations)
+ getDefer.addCallback(self.check_response, hash, path)
+ getDefer.addCallback(self.mirrors.save_file, hash, path)
+ getDefer.addErrback(self.mirrors.save_error, path)
+ getDefer.addCallbacks(d.callback, d.errback)
+
+ def check_response(self, response, hash, path):
+ if response.code < 200 or response.code >= 300:
+ log.msg('Download from peers failed, going to direct download: %s' % path)
+ getDefer = self.peers.get([path])
+ return getDefer
+ return response
+
+ def cached_file(self, hash, url, file_path):
+ assert file_path.startswith(config.get('DEFAULT', 'cache_dir'))
+ urlpath, newdir = self.db.storeFile(file_path, hash.digest(), config.get('DEFAULT', 'cache_dir'))
+ log.msg('now avaliable at %s: %s' % (urlpath, url))
+
+ if self.my_addr:
+ site = self.my_addr + ':' + str(config.getint('DEFAULT', 'PORT'))
+ full_path = urlunparse(('http', site, urlpath, None, None, None))
+ key = hash.norm(bits = config.getint(config.get('DEFAULT', 'DHT'), 'HASH_LENGTH'))
+ storeDefer = self.dht.storeValue(key, full_path)
+ storeDefer.addCallback(self.store_done, full_path)
+ storeDefer.addErrback(log.err)
+
+ def store_done(self, result, path):
+ log.msg('Added %s to the DHT: %r' % (path, result))
+
\ No newline at end of file
projects / quix0rs-apt-p2p.git / blobdiff