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.setDirectories = self.http_server.setDirectories
34 self.http_site = server.Site(self.http_server)
35 self.peers = PeerManager()
36 self.mirrors = MirrorManager(self.cache_dir)
37 self.cache = CacheManager(self.cache_dir.child(download_dir), self.db, self)
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"
47 self.cache.scanDirectories()
49 def joinError(self, failure):
50 log.msg("joining DHT failed miserably")
52 raise RuntimeError, "IP address for this machine could not be found"
54 def check_freshness(self, path, modtime, resp):
55 log.msg('Checking if %s is still fresh' % path)
56 d = self.peers.get([path], "HEAD", modtime)
57 d.addCallback(self.check_freshness_done, path, resp)
60 def check_freshness_done(self, resp, path, orig_resp):
62 log.msg('Still fresh, returning: %s' % path)
65 log.msg('Stale, need to redownload: %s' % path)
66 return self.get_resp(path)
68 def get_resp(self, path):
71 log.msg('Trying to find hash for %s' % path)
72 findDefer = self.mirrors.findHash(path)
74 findDefer.addCallbacks(self.findHash_done, self.findHash_error,
75 callbackArgs=(path, d), errbackArgs=(path, d))
76 findDefer.addErrback(log.err)
79 def findHash_error(self, failure, path, d):
81 self.findHash_done(HashObject(), path, d)
83 def findHash_done(self, hash, path, d):
84 if hash.expected() is None:
85 log.msg('Hash for %s was not found' % path)
86 self.lookupHash_done([], hash, path, d)
88 log.msg('Found hash %s for %s' % (hash.hexexpected(), path))
89 # Lookup hash from DHT
90 key = hash.normexpected(bits = config.getint(config.get('DEFAULT', 'DHT'), 'HASH_LENGTH'))
91 lookupDefer = self.dht.getValue(key)
92 lookupDefer.addCallback(self.lookupHash_done, hash, path, d)
94 def lookupHash_done(self, locations, hash, path, d):
96 log.msg('Peers for %s were not found' % path)
97 getDefer = self.peers.get([path])
98 getDefer.addCallback(self.cache.save_file, hash, path)
99 getDefer.addErrback(self.cache.save_error, path)
100 getDefer.addCallbacks(d.callback, d.errback)
102 log.msg('Found peers for %s: %r' % (path, locations))
103 # Download from the found peers
104 getDefer = self.peers.get(locations)
105 getDefer.addCallback(self.check_response, hash, path)
106 getDefer.addCallback(self.cache.save_file, hash, path)
107 getDefer.addErrback(self.cache.save_error, path)
108 getDefer.addCallbacks(d.callback, d.errback)
110 def check_response(self, response, hash, path):
111 if response.code < 200 or response.code >= 300:
112 log.msg('Download from peers failed, going to direct download: %s' % path)
113 getDefer = self.peers.get([path])
117 def new_cached_file(self, file_path, hash, urlpath, url = None):
118 """Add a newly cached file to the DHT.
120 If the file was downloaded, set url to the path it was downloaded for.
123 self.mirrors.updatedFile(url, file_path)
125 if self.my_addr and hash:
126 site = self.my_addr + ':' + str(config.getint('DEFAULT', 'PORT'))
127 full_path = urlunparse(('http', site, urlpath, None, None, None))
128 key = hash.norm(bits = config.getint(config.get('DEFAULT', 'DHT'), 'HASH_LENGTH'))
129 storeDefer = self.dht.storeValue(key, full_path)
130 storeDefer.addCallback(self.store_done, full_path)
131 storeDefer.addErrback(log.err)
133 def store_done(self, result, path):
134 log.msg('Added %s to the DHT: %r' % (path, result))