def _startFactory(self):
log.msg('Starting the main apt_p2p application')
self.cache_dir = FilePath(config.get('DEFAULT', 'CACHE_DIR'))
if not self.cache_dir.child(download_dir).exists():
self.cache_dir.child(download_dir).makedirs()
if not self.cache_dir.child(peer_dir).exists():
self.cache_dir.child(peer_dir).makedirs()
self.db = DB(self.cache_dir.child('apt-p2p.db'))
self.dht = DHT(self.dhtClass, self.db)
df = self.dht.start()
df.addCallback(self._dhtStarted)
self.stats = StatsLogger(self.db)
self.http_server = TopLevel(self.cache_dir.child(download_dir),
self.db, self)
self.http_server.getHTTPFactory().startFactory()
self.peers = PeerManager(self.cache_dir.child(peer_dir), self.dht,
self.stats)
self.mirrors = MirrorManager(self.cache_dir)
self.cache = CacheManager(self.cache_dir.child(download_dir), self.db,
self)
def _startFactory(self):
log.msg('Starting the main apt_p2p application')
self.cache_dir = FilePath(config.get('DEFAULT', 'CACHE_DIR'))
if not self.cache_dir.child(download_dir).exists():
self.cache_dir.child(download_dir).makedirs()
if not self.cache_dir.child(peer_dir).exists():
self.cache_dir.child(peer_dir).makedirs()
self.db = DB(self.cache_dir.child('apt-p2p.db'))
self.dht = DHT(self.dhtClass, self.db)
df = self.dht.start()
df.addCallback(self._dhtStarted)
self.stats = StatsLogger(self.db)
self.http_server = TopLevel(self.cache_dir.child(download_dir), self.db, self)
self.http_server.getHTTPFactory().startFactory()
self.peers = PeerManager(self.cache_dir.child(peer_dir), self.dht, self.stats)
self.mirrors = MirrorManager(self.cache_dir)
self.cache = CacheManager(self.cache_dir.child(download_dir), self.db, self)
class AptP2P(protocol.Factory):
"""The main code object that does all of the work.
Contains all of the sub-components that do all the low-level work, and
coordinates communication between them.
@type dhtClass: L{interfaces.IDHT}
@ivar dhtClass: the DHT class to use
@type cache_dir: L{twisted.python.filepath.FilePath}
@ivar cache_dir: the directory to use for storing all files
@type db: L{db.DB}
@ivar db: the database to use for tracking files and hashes
@type dht: L{DHTManager.DHT}
@ivar dht: the manager for DHT requests
@type stats: L{stats.StatsLogger}
@ivar stats: the statistics logger to record sent data to
@type http_server: L{HTTPServer.TopLevel}
@ivar http_server: the web server that will handle all requests from apt
and from other peers
@type peers: L{PeerManager.PeerManager}
@ivar peers: the manager of all downloads from mirrors and other peers
@type mirrors: L{MirrorManager.MirrorManager}
@ivar mirrors: the manager of downloaded information about mirrors which
can be queried to get hashes from file names
@type cache: L{CacheManager.CacheManager}
@ivar cache: the manager of all downloaded files
@type my_addr: C{string}, C{int}
@ivar my_addr: the IP address and port of this peer
"""
def __init__(self, dhtClass):
"""Initialize all the sub-components.
@type dhtClass: L{interfaces.IDHT}
@param dhtClass: the DHT class to use
"""
log.msg('Initializing the main apt_p2p application')
self.dhtClass = dhtClass
self.my_addr = None
#{ Factory interface
def startFactory(self):
reactor.callLater(0, self._startFactory)
def _startFactory(self):
log.msg('Starting the main apt_p2p application')
self.cache_dir = FilePath(config.get('DEFAULT', 'CACHE_DIR'))
if not self.cache_dir.child(download_dir).exists():
self.cache_dir.child(download_dir).makedirs()
if not self.cache_dir.child(peer_dir).exists():
self.cache_dir.child(peer_dir).makedirs()
self.db = DB(self.cache_dir.child('apt-p2p.db'))
self.dht = DHT(self.dhtClass, self.db)
df = self.dht.start()
df.addCallback(self._dhtStarted)
self.stats = StatsLogger(self.db)
self.http_server = TopLevel(self.cache_dir.child(download_dir),
self.db, self)
self.http_server.getHTTPFactory().startFactory()
self.peers = PeerManager(self.cache_dir.child(peer_dir), self.dht,
self.stats)
self.mirrors = MirrorManager(self.cache_dir)
self.cache = CacheManager(self.cache_dir.child(download_dir), self.db,
self)
def _dhtStarted(self, result):
"""Save the returned address and start scanning the cache."""
self.my_addr = result
self.cache.scanDirectories()
def stopFactory(self):
log.msg('Stoppping the main apt_p2p application')
self.http_server.getHTTPFactory().stopFactory()
self.mirrors.cleanup()
self.stats.save()
self.db.close()
def buildProtocol(self, addr):
return self.http_server.getHTTPFactory().buildProtocol(addr)
#{ Other functions
def getStats(self):
"""Retrieve and format the statistics for the program.
@rtype: C{string}
@return: the formatted HTML page containing the statistics
"""
out = '<html><body>\n\n'
out += self.stats.formatHTML(self.my_addr)
out += '\n\n'
out += self.dht.getStats()
out += '\n</body></html>\n'
return out
#{ Main workflow
def get_resp(self, req, url, orig_resp=None):
"""Lookup a hash for the file in the local mirror info.
Starts the process of getting a response to an apt request.
@type req: L{twisted.web2.http.Request}
@param req: the initial request sent to the HTTP server by apt
@param url: the URI of the actual mirror request
@type orig_resp: L{twisted.web2.http.Response}
@param orig_resp: the response from the cache to be sent to apt
(optional, ignored if missing)
@rtype: L{twisted.internet.defer.Deferred}
@return: a deferred that will be called back with the response
"""
d = defer.Deferred()
log.msg('Trying to find hash for %s' % url)
findDefer = self.mirrors.findHash(unquote(url))
findDefer.addCallbacks(self.findHash_done,
self.findHash_error,
callbackArgs=(req, url, orig_resp, d),
errbackArgs=(req, url, orig_resp, d))
return d
def findHash_error(self, failure, req, url, orig_resp, d):
"""Process the error in hash lookup by returning an empty L{HashObject}."""
log.msg('Hash lookup for %s resulted in an error: %s' %
(url, failure.getErrorMessage()))
self.findHash_done(HashObject(), req, url, orig_resp, d)
def findHash_done(self, hash, req, url, orig_resp, d):
"""Use the returned hash to lookup the file in the cache.
If the hash was not found, the workflow skips down to download from
the mirror (L{startDownload}), or checks the freshness of an old
response if there is one.
@type hash: L{Hash.HashObject}
@param hash: the hash object containing the expected hash for the file
"""
if hash.expected() is None:
log.msg('Hash for %s was not found' % url)
# Send the old response or get a new one
if orig_resp:
self.check_freshness(req, url, orig_resp, d)
else:
self.startDownload([], req, hash, url, d)
else:
log.msg('Found hash %s for %s' % (hash.hexexpected(), url))
# Lookup hash in cache
locations = self.db.lookupHash(hash.expected(), filesOnly=True)
self.getCachedFile(hash, req, url, d, locations)
def check_freshness(self, req, url, orig_resp, d):
"""Send a HEAD to the mirror to check if the response from the cache is still valid.
@type req: L{twisted.web2.http.Request}
@param req: the initial request sent to the HTTP server by apt
@param url: the URI of the actual mirror request
@type orig_resp: L{twisted.web2.http.Response}
@param orig_resp: the response from the cache to be sent to apt
"""
log.msg('Checking if %s is still fresh' % url)
modtime = orig_resp.headers.getHeader('Last-Modified')
headDefer = self.peers.get(HashObject(),
url,
method="HEAD",
modtime=modtime)
headDefer.addCallbacks(self.check_freshness_done,
self.check_freshness_error,
callbackArgs=(req, url, orig_resp, d),
errbackArgs=(req, url, d))
def check_freshness_done(self, resp, req, url, orig_resp, d):
"""Return the fresh response, if stale start to redownload.
@type resp: L{twisted.web2.http.Response}
@param resp: the response from the mirror to the HEAD request
@type req: L{twisted.web2.http.Request}
@param req: the initial request sent to the HTTP server by apt
@param url: the URI of the actual mirror request
@type orig_resp: L{twisted.web2.http.Response}
@param orig_resp: the response from the cache to be sent to apt
"""
if resp.code == 304:
log.msg('Still fresh, returning: %s' % url)
d.callback(orig_resp)
else:
log.msg('Stale, need to redownload: %s' % url)
self.startDownload([], req, HashObject(), url, d)
def check_freshness_error(self, err, req, url, d):
"""Mirror request failed, continue with download.
@param err: the response from the mirror to the HEAD request
@type req: L{twisted.web2.http.Request}
@param req: the initial request sent to the HTTP server by apt
@param url: the URI of the actual mirror request
"""
log.err(err)
self.startDownload([], req, HashObject(), url, d)
def getCachedFile(self, hash, req, url, d, locations):
"""Try to return the file from the cache, otherwise move on to a DHT lookup.
@type locations: C{list} of C{dictionary}
@param locations: the files in the cache that match the hash,
the dictionary contains a key 'path' whose value is a
L{twisted.python.filepath.FilePath} object for the file.
"""
if not locations:
log.msg('Failed to return file from cache: %s' % url)
self.lookupHash(req, hash, url, d)
return
# Get the first possible location from the list
file = locations.pop(0)['path']
log.msg('Returning cached file: %s' % file.path)
# Get it's response
resp = static.File(file.path).renderHTTP(req)
if isinstance(resp, defer.Deferred):
resp.addBoth(self._getCachedFile, hash, req, url, d, locations)
else:
self._getCachedFile(resp, hash, req, url, d, locations)
def _getCachedFile(self, resp, hash, req, url, d, locations):
"""Check the returned response to be sure it is valid."""
if isinstance(resp, failure.Failure):
log.msg('Got error trying to get cached file')
log.err(resp)
# Try the next possible location
self.getCachedFile(hash, req, url, d, locations)
return
log.msg('Cached response: %r' % resp)
if resp.code >= 200 and resp.code < 400:
d.callback(resp)
else:
# Try the next possible location
self.getCachedFile(hash, req, url, d, locations)
def lookupHash(self, req, hash, url, d):
"""Lookup the hash in the DHT."""
log.msg('Looking up hash in DHT for file: %s' % url)
key = hash.expected()
lookupDefer = self.dht.get(key)
lookupDefer.addBoth(self.startDownload, req, hash, url, d)
def startDownload(self, values, req, hash, url, d):
"""Start the download of the file.
The download will be from peers if the DHT lookup succeeded, or
from the mirror otherwise.
@type values: C{list} of C{dictionary}
@param values: the returned values from the DHT containing peer
download information
"""
# Remove some headers Apt sets in the request
req.headers.removeHeader('If-Modified-Since')
req.headers.removeHeader('Range')
req.headers.removeHeader('If-Range')
if not isinstance(values, list) or not values:
if not isinstance(values, list):
log.msg('DHT lookup for %s failed with error %r' %
(url, values))
else:
log.msg('Peers for %s were not found' % url)
getDefer = self.peers.get(hash, url)
# getDefer.addErrback(self.final_fallback, hash, url)
getDefer.addCallback(self.cache.save_file, hash, url)
getDefer.addErrback(self.cache.save_error, url)
getDefer.addCallbacks(d.callback, d.errback)
else:
log.msg('Found peers for %s: %r' % (url, values))
# Download from the found peers
getDefer = self.peers.get(hash, url, values)
getDefer.addCallback(self.check_response, hash, url)
getDefer.addCallback(self.cache.save_file, hash, url)
getDefer.addErrback(self.cache.save_error, url)
getDefer.addCallbacks(d.callback, d.errback)
def check_response(self, response, hash, url):
"""Check the response from peers, and download from the mirror if it is not."""
if response.code < 200 or response.code >= 300:
log.msg(
'Download from peers failed, going to direct download: %s' %
url)
getDefer = self.peers.get(hash, url)
# getDefer.addErrback(self.final_fallback, hash, url)
return getDefer
return response
def final_fallback(self, err, hash, url):
"""Final retry if the mirror still generated an error."""
log.msg('Download from mirror failed, retrying once only: %s' % url)
log.err(err)
getDefer = self.peers.get(hash, url)
return getDefer
def new_cached_file(self,
file_path,
hash,
new_hash,
url=None,
forceDHT=False):
"""Add a newly cached file to the mirror info and/or the DHT.
If the file was downloaded, set url to the path it was downloaded for.
Doesn't add a file to the DHT unless a hash was found for it
(but does add it anyway if forceDHT is True).
@type file_path: L{twisted.python.filepath.FilePath}
@param file_path: the location of the file in the local cache
@type hash: L{Hash.HashObject}
@param hash: the original (expected) hash object containing also the
hash of the downloaded file
@type new_hash: C{boolean}
@param new_hash: whether the has was new to this peer, and so should
be added to the DHT
@type url: C{string}
@param url: the URI of the location of the file in the mirror
(optional, defaults to not adding the file to the mirror info)
@type forceDHT: C{boolean}
@param forceDHT: whether to force addition of the file to the DHT
even if the hash was not found in a mirror
(optional, defaults to False)
"""
if url:
self.mirrors.updatedFile(url, file_path)
if self.my_addr and hash and new_hash and (hash.expected() is not None
or forceDHT):
return self.dht.store(hash)
return None
class AptP2P(protocol.Factory):
"""The main code object that does all of the work.
Contains all of the sub-components that do all the low-level work, and
coordinates communication between them.
@type dhtClass: L{interfaces.IDHT}
@ivar dhtClass: the DHT class to use
@type cache_dir: L{twisted.python.filepath.FilePath}
@ivar cache_dir: the directory to use for storing all files
@type db: L{db.DB}
@ivar db: the database to use for tracking files and hashes
@type dht: L{DHTManager.DHT}
@ivar dht: the manager for DHT requests
@type stats: L{stats.StatsLogger}
@ivar stats: the statistics logger to record sent data to
@type http_server: L{HTTPServer.TopLevel}
@ivar http_server: the web server that will handle all requests from apt
and from other peers
@type peers: L{PeerManager.PeerManager}
@ivar peers: the manager of all downloads from mirrors and other peers
@type mirrors: L{MirrorManager.MirrorManager}
@ivar mirrors: the manager of downloaded information about mirrors which
can be queried to get hashes from file names
@type cache: L{CacheManager.CacheManager}
@ivar cache: the manager of all downloaded files
@type my_addr: C{string}, C{int}
@ivar my_addr: the IP address and port of this peer
"""
def __init__(self, dhtClass):
"""Initialize all the sub-components.
@type dhtClass: L{interfaces.IDHT}
@param dhtClass: the DHT class to use
"""
log.msg('Initializing the main apt_p2p application')
self.dhtClass = dhtClass
self.my_addr = None
#{ Factory interface
def startFactory(self):
reactor.callLater(0, self._startFactory)
def _startFactory(self):
log.msg('Starting the main apt_p2p application')
self.cache_dir = FilePath(config.get('DEFAULT', 'CACHE_DIR'))
if not self.cache_dir.child(download_dir).exists():
self.cache_dir.child(download_dir).makedirs()
if not self.cache_dir.child(peer_dir).exists():
self.cache_dir.child(peer_dir).makedirs()
self.db = DB(self.cache_dir.child('apt-p2p.db'))
self.dht = DHT(self.dhtClass, self.db)
df = self.dht.start()
df.addCallback(self._dhtStarted)
self.stats = StatsLogger(self.db)
self.http_server = TopLevel(self.cache_dir.child(download_dir), self.db, self)
self.http_server.getHTTPFactory().startFactory()
self.peers = PeerManager(self.cache_dir.child(peer_dir), self.dht, self.stats)
self.mirrors = MirrorManager(self.cache_dir)
self.cache = CacheManager(self.cache_dir.child(download_dir), self.db, self)
def _dhtStarted(self, result):
"""Save the returned address and start scanning the cache."""
self.my_addr = result
self.cache.scanDirectories()
def stopFactory(self):
log.msg('Stoppping the main apt_p2p application')
self.http_server.getHTTPFactory().stopFactory()
self.mirrors.cleanup()
self.stats.save()
self.db.close()
def buildProtocol(self, addr):
return self.http_server.getHTTPFactory().buildProtocol(addr)
#{ Other functions
def getStats(self):
"""Retrieve and format the statistics for the program.
@rtype: C{string}
@return: the formatted HTML page containing the statistics
"""
out = '<html><body>\n\n'
out += self.stats.formatHTML(self.my_addr)
out += '\n\n'
out += self.dht.getStats()
out += '\n</body></html>\n'
return out
#{ Main workflow
def get_resp(self, req, url, orig_resp = None):
"""Lookup a hash for the file in the local mirror info.
Starts the process of getting a response to an apt request.
@type req: L{twisted.web2.http.Request}
@param req: the initial request sent to the HTTP server by apt
@param url: the URI of the actual mirror request
@type orig_resp: L{twisted.web2.http.Response}
@param orig_resp: the response from the cache to be sent to apt
(optional, ignored if missing)
@rtype: L{twisted.internet.defer.Deferred}
@return: a deferred that will be called back with the response
"""
d = defer.Deferred()
log.msg('Trying to find hash for %s' % url)
findDefer = self.mirrors.findHash(unquote(url))
findDefer.addCallbacks(self.findHash_done, self.findHash_error,
callbackArgs=(req, url, orig_resp, d),
errbackArgs=(req, url, orig_resp, d))
return d
def findHash_error(self, failure, req, url, orig_resp, d):
"""Process the error in hash lookup by returning an empty L{HashObject}."""
log.msg('Hash lookup for %s resulted in an error: %s' %
(url, failure.getErrorMessage()))
self.findHash_done(HashObject(), req, url, orig_resp, d)
def findHash_done(self, hash, req, url, orig_resp, d):
"""Use the returned hash to lookup the file in the cache.
If the hash was not found, the workflow skips down to download from
the mirror (L{startDownload}), or checks the freshness of an old
response if there is one.
@type hash: L{Hash.HashObject}
@param hash: the hash object containing the expected hash for the file
"""
if hash.expected() is None:
log.msg('Hash for %s was not found' % url)
# Send the old response or get a new one
if orig_resp:
self.check_freshness(req, url, orig_resp, d)
else:
self.startDownload([], req, hash, url, d)
else:
log.msg('Found hash %s for %s' % (hash.hexexpected(), url))
# Lookup hash in cache
locations = self.db.lookupHash(hash.expected(), filesOnly = True)
self.getCachedFile(hash, req, url, d, locations)
def check_freshness(self, req, url, orig_resp, d):
"""Send a HEAD to the mirror to check if the response from the cache is still valid.
@type req: L{twisted.web2.http.Request}
@param req: the initial request sent to the HTTP server by apt
@param url: the URI of the actual mirror request
@type orig_resp: L{twisted.web2.http.Response}
@param orig_resp: the response from the cache to be sent to apt
"""
log.msg('Checking if %s is still fresh' % url)
modtime = orig_resp.headers.getHeader('Last-Modified')
headDefer = self.peers.get(HashObject(), url, method = "HEAD",
modtime = modtime)
headDefer.addCallbacks(self.check_freshness_done,
self.check_freshness_error,
callbackArgs = (req, url, orig_resp, d),
errbackArgs = (req, url, d))
def check_freshness_done(self, resp, req, url, orig_resp, d):
"""Return the fresh response, if stale start to redownload.
@type resp: L{twisted.web2.http.Response}
@param resp: the response from the mirror to the HEAD request
@type req: L{twisted.web2.http.Request}
@param req: the initial request sent to the HTTP server by apt
@param url: the URI of the actual mirror request
@type orig_resp: L{twisted.web2.http.Response}
@param orig_resp: the response from the cache to be sent to apt
"""
if resp.code == 304:
log.msg('Still fresh, returning: %s' % url)
d.callback(orig_resp)
else:
log.msg('Stale, need to redownload: %s' % url)
self.startDownload([], req, HashObject(), url, d)
def check_freshness_error(self, err, req, url, d):
"""Mirror request failed, continue with download.
@param err: the response from the mirror to the HEAD request
@type req: L{twisted.web2.http.Request}
@param req: the initial request sent to the HTTP server by apt
@param url: the URI of the actual mirror request
"""
log.err(err)
self.startDownload([], req, HashObject(), url, d)
def getCachedFile(self, hash, req, url, d, locations):
"""Try to return the file from the cache, otherwise move on to a DHT lookup.
@type locations: C{list} of C{dictionary}
@param locations: the files in the cache that match the hash,
the dictionary contains a key 'path' whose value is a
L{twisted.python.filepath.FilePath} object for the file.
"""
if not locations:
log.msg('Failed to return file from cache: %s' % url)
self.lookupHash(req, hash, url, d)
return
# Get the first possible location from the list
file = locations.pop(0)['path']
log.msg('Returning cached file: %s' % file.path)
# Get it's response
resp = static.File(file.path).renderHTTP(req)
if isinstance(resp, defer.Deferred):
resp.addBoth(self._getCachedFile, hash, req, url, d, locations)
else:
self._getCachedFile(resp, hash, req, url, d, locations)
def _getCachedFile(self, resp, hash, req, url, d, locations):
"""Check the returned response to be sure it is valid."""
if isinstance(resp, failure.Failure):
log.msg('Got error trying to get cached file')
log.err(resp)
# Try the next possible location
self.getCachedFile(hash, req, url, d, locations)
return
log.msg('Cached response: %r' % resp)
if resp.code >= 200 and resp.code < 400:
d.callback(resp)
else:
# Try the next possible location
self.getCachedFile(hash, req, url, d, locations)
def lookupHash(self, req, hash, url, d):
"""Lookup the hash in the DHT."""
log.msg('Looking up hash in DHT for file: %s' % url)
key = hash.expected()
lookupDefer = self.dht.get(key)
lookupDefer.addBoth(self.startDownload, req, hash, url, d)
def startDownload(self, values, req, hash, url, d):
"""Start the download of the file.
The download will be from peers if the DHT lookup succeeded, or
from the mirror otherwise.
@type values: C{list} of C{dictionary}
@param values: the returned values from the DHT containing peer
download information
"""
# Remove some headers Apt sets in the request
req.headers.removeHeader('If-Modified-Since')
req.headers.removeHeader('Range')
req.headers.removeHeader('If-Range')
if not isinstance(values, list) or not values:
if not isinstance(values, list):
log.msg('DHT lookup for %s failed with error %r' % (url, values))
else:
log.msg('Peers for %s were not found' % url)
getDefer = self.peers.get(hash, url)
# getDefer.addErrback(self.final_fallback, hash, url)
getDefer.addCallback(self.cache.save_file, hash, url)
getDefer.addErrback(self.cache.save_error, url)
getDefer.addCallbacks(d.callback, d.errback)
else:
log.msg('Found peers for %s: %r' % (url, values))
# Download from the found peers
getDefer = self.peers.get(hash, url, values)
getDefer.addCallback(self.check_response, hash, url)
getDefer.addCallback(self.cache.save_file, hash, url)
getDefer.addErrback(self.cache.save_error, url)
getDefer.addCallbacks(d.callback, d.errback)
def check_response(self, response, hash, url):
"""Check the response from peers, and download from the mirror if it is not."""
if response.code < 200 or response.code >= 300:
log.msg('Download from peers failed, going to direct download: %s' % url)
getDefer = self.peers.get(hash, url)
# getDefer.addErrback(self.final_fallback, hash, url)
return getDefer
return response
def final_fallback(self, err, hash, url):
"""Final retry if the mirror still generated an error."""
log.msg('Download from mirror failed, retrying once only: %s' % url)
log.err(err)
getDefer = self.peers.get(hash, url)
return getDefer
def new_cached_file(self, file_path, hash, new_hash, url = None, forceDHT = False):
"""Add a newly cached file to the mirror info and/or the DHT.
If the file was downloaded, set url to the path it was downloaded for.
Doesn't add a file to the DHT unless a hash was found for it
(but does add it anyway if forceDHT is True).
@type file_path: L{twisted.python.filepath.FilePath}
@param file_path: the location of the file in the local cache
@type hash: L{Hash.HashObject}
@param hash: the original (expected) hash object containing also the
hash of the downloaded file
@type new_hash: C{boolean}
@param new_hash: whether the has was new to this peer, and so should
be added to the DHT
@type url: C{string}
@param url: the URI of the location of the file in the mirror
(optional, defaults to not adding the file to the mirror info)
@type forceDHT: C{boolean}
@param forceDHT: whether to force addition of the file to the DHT
even if the hash was not found in a mirror
(optional, defaults to False)
"""
if url:
self.mirrors.updatedFile(url, file_path)
if self.my_addr and hash and new_hash and (hash.expected() is not None or forceDHT):
return self.dht.store(hash)
return None
