2 from binascii import b2a_hex
3 from urlparse import urlunparse
6 from twisted.internet import defer
7 from twisted.web2 import server, http, http_headers
8 from twisted.python import log
9 from twisted.python.filepath import FilePath
11 from apt_dht_conf import config
12 from PeerManager import PeerManager
13 from HTTPServer import TopLevel
14 from MirrorManager import MirrorManager
15 from CacheManager import CacheManager
16 from Hash import HashObject
18 from util import findMyIPAddr
20 download_dir = 'cache'
23 def __init__(self, dht):
24 log.msg('Initializing the main apt_dht application')
25 self.cache_dir = FilePath(config.get('DEFAULT', 'cache_dir'))
26 if not self.cache_dir.child(download_dir).exists():
27 self.cache_dir.child(download_dir).makedirs()
28 self.db = DB(self.cache_dir.child('apt-dht.db'))
30 self.dht.loadConfig(config, config.get('DEFAULT', 'DHT'))
31 self.dht.join().addCallbacks(self.joinComplete, self.joinError)
32 self.http_server = TopLevel(self.cache_dir.child(download_dir), self)
33 self.http_site = server.Site(self.http_server)
34 self.peers = PeerManager()
35 self.mirrors = MirrorManager(self.cache_dir)
36 self.cache = CacheManager(self.cache_dir.child(download_dir), self.db, self)
38 self.setDirectories = self.http_server.setDirectories
43 def joinComplete(self, result):
44 self.my_addr = findMyIPAddr(result, config.getint(config.get('DEFAULT', 'DHT'), 'PORT'))
46 raise RuntimeError, "IP address for this machine could not be found"
48 def joinError(self, failure):
49 log.msg("joining DHT failed miserably")
51 raise RuntimeError, "IP address for this machine could not be found"
53 def check_freshness(self, path, modtime, resp):
54 log.msg('Checking if %s is still fresh' % path)
55 d = self.peers.get([path], "HEAD", modtime)
56 d.addCallback(self.check_freshness_done, path, resp)
59 def check_freshness_done(self, resp, path, orig_resp):
61 log.msg('Still fresh, returning: %s' % path)
64 log.msg('Stale, need to redownload: %s' % path)
65 return self.get_resp(path)
67 def get_resp(self, path):
70 log.msg('Trying to find hash for %s' % path)
71 findDefer = self.mirrors.findHash(path)
73 findDefer.addCallbacks(self.findHash_done, self.findHash_error,
74 callbackArgs=(path, d), errbackArgs=(path, d))
75 findDefer.addErrback(log.err)
78 def findHash_error(self, failure, path, d):
80 self.findHash_done(HashObject(), path, d)
82 def findHash_done(self, hash, path, d):
83 if hash.expected() is None:
84 log.msg('Hash for %s was not found' % path)
85 self.lookupHash_done([], hash, path, d)
87 log.msg('Found hash %s for %s' % (hash.hexexpected(), path))
88 # Lookup hash from DHT
89 key = hash.normexpected(bits = config.getint(config.get('DEFAULT', 'DHT'), 'HASH_LENGTH'))
90 lookupDefer = self.dht.getValue(key)
91 lookupDefer.addCallback(self.lookupHash_done, hash, path, d)
93 def lookupHash_done(self, locations, hash, path, d):
95 log.msg('Peers for %s were not found' % path)
96 getDefer = self.peers.get([path])
97 getDefer.addCallback(self.cache.save_file, hash, path)
98 getDefer.addErrback(self.cache.save_error, path)
99 getDefer.addCallbacks(d.callback, d.errback)
101 log.msg('Found peers for %s: %r' % (path, locations))
102 # Download from the found peers
103 getDefer = self.peers.get(locations)
104 getDefer.addCallback(self.check_response, hash, path)
105 getDefer.addCallback(self.cache.save_file, hash, path)
106 getDefer.addErrback(self.cache.save_error, path)
107 getDefer.addCallbacks(d.callback, d.errback)
109 def check_response(self, response, hash, path):
110 if response.code < 200 or response.code >= 300:
111 log.msg('Download from peers failed, going to direct download: %s' % path)
112 getDefer = self.peers.get([path])
116 def new_cached_file(self, url, file_path, hash, urlpath):
117 self.mirrors.updatedFile(url, file_path)
119 if self.my_addr and hash:
120 site = self.my_addr + ':' + str(config.getint('DEFAULT', 'PORT'))
121 full_path = urlunparse(('http', site, urlpath, None, None, None))
122 key = hash.norm(bits = config.getint(config.get('DEFAULT', 'DHT'), 'HASH_LENGTH'))
123 storeDefer = self.dht.storeValue(key, full_path)
124 storeDefer.addCallback(self.store_done, full_path)
125 storeDefer.addErrback(log.err)
127 def store_done(self, result, path):
128 log.msg('Added %s to the DHT: %r' % (path, result))