+
+from bz2 import BZ2Decompressor
+from zlib import decompressobj, MAX_WBITS
+from gzip import FCOMMENT, FEXTRA, FHCRC, FNAME, FTEXT
+from urlparse import urlparse
+import os
+
+from twisted.python import log
+from twisted.python.filepath import FilePath
+from twisted.internet import defer
+from twisted.trial import unittest
+from twisted.web2 import stream
+from twisted.web2.http import splitHostPort
+
+from AptPackages import AptPackages
+
+aptpkg_dir='apt-packages'
+
+DECOMPRESS_EXTS = ['.gz', '.bz2']
+DECOMPRESS_FILES = ['release', 'sources', 'packages']
+
+class ProxyFileStream(stream.SimpleStream):
+ """Saves a stream to a file while providing a new stream."""
+
+ def __init__(self, stream, outFile, hash, decompress = None, decFile = None):
+ """Initializes the proxy.
+
+ @type stream: C{twisted.web2.stream.IByteStream}
+ @param stream: the input stream to read from
+ @type outFile: C{twisted.python.FilePath}
+ @param outFile: the file to write to
+ @type hash: L{Hash.HashObject}
+ @param hash: the hash object to use for the file
+ @type decompress: C{string}
+ @param decompress: also decompress the file as this type
+ (currently only '.gz' and '.bz2' are supported)
+ @type decFile: C{twisted.python.FilePath}
+ @param decFile: the file to write the decompressed data to
+ """
+ self.stream = stream
+ self.outFile = outFile.open('w')
+ self.hash = hash
+ self.hash.new()
+ self.gzfile = None
+ self.bz2file = None
+ if decompress == ".gz":
+ self.gzheader = True
+ self.gzfile = decFile.open('w')
+ self.gzdec = decompressobj(-MAX_WBITS)
+ elif decompress == ".bz2":
+ self.bz2file = decFile.open('w')
+ self.bz2dec = BZ2Decompressor()
+ self.length = self.stream.length
+ self.start = 0
+ self.doneDefer = defer.Deferred()
+
+ def _done(self):
+ """Close the output file."""
+ if not self.outFile.closed:
+ self.outFile.close()
+ self.hash.digest()
+ if self.gzfile:
+ data_dec = self.gzdec.flush()
+ self.gzfile.write(data_dec)
+ self.gzfile.close()
+ self.gzfile = None
+ if self.bz2file:
+ self.bz2file.close()
+ self.bz2file = None
+
+ self.doneDefer.callback(self.hash)
+
+ def read(self):
+ """Read some data from the stream."""
+ if self.outFile.closed:
+ return None
+
+ data = self.stream.read()
+ if isinstance(data, defer.Deferred):
+ data.addCallbacks(self._write, self._done)
+ return data
+
+ self._write(data)
+ return data
+
+ def _write(self, data):
+ """Write the stream data to the file and return it for others to use."""
+ if data is None:
+ self._done()
+ return data
+
+ self.outFile.write(data)
+ self.hash.update(data)
+ if self.gzfile:
+ if self.gzheader:
+ self.gzheader = False
+ new_data = self._remove_gzip_header(data)
+ dec_data = self.gzdec.decompress(new_data)
+ else:
+ dec_data = self.gzdec.decompress(data)
+ self.gzfile.write(dec_data)
+ if self.bz2file:
+ dec_data = self.bz2dec.decompress(data)
+ self.bz2file.write(dec_data)
+ return data
+
+ def _remove_gzip_header(self, data):
+ if data[:2] != '\037\213':
+ raise IOError, 'Not a gzipped file'
+ if ord(data[2]) != 8:
+ raise IOError, 'Unknown compression method'
+ flag = ord(data[3])
+ # modtime = self.fileobj.read(4)
+ # extraflag = self.fileobj.read(1)
+ # os = self.fileobj.read(1)
+
+ skip = 10
+ if flag & FEXTRA:
+ # Read & discard the extra field, if present
+ xlen = ord(data[10])
+ xlen = xlen + 256*ord(data[11])
+ skip = skip + 2 + xlen
+ if flag & FNAME:
+ # Read and discard a null-terminated string containing the filename
+ while True:
+ if not data[skip] or data[skip] == '\000':
+ break
+ skip += 1
+ skip += 1
+ if flag & FCOMMENT:
+ # Read and discard a null-terminated string containing a comment
+ while True:
+ if not data[skip] or data[skip] == '\000':
+ break
+ skip += 1
+ skip += 1
+ if flag & FHCRC:
+ skip += 2 # Read & discard the 16-bit header CRC
+ return data[skip:]
+
+ def close(self):
+ """Clean everything up and return None to future reads."""
+ self.length = 0
+ self._done()
+ self.stream.close()
+
+class CacheManager:
+ """Manages all requests for cached objects."""
+
+ def __init__(self, cache_dir, db, manager = None):
+ self.cache_dir = cache_dir
+ self.db = db
+ self.manager = manager
+
+ def save_file(self, response, hash, url):
+ """Save a downloaded file to the cache and stream it."""
+ if response.code != 200:
+ log.msg('File was not found (%r): %s' % (response, url))
+ return response
+
+ log.msg('Returning file: %s' % url)
+
+ parsed = urlparse(url)
+ destFile = self.cache_dir.preauthChild(parsed[1] + parsed[2])
+ log.msg('Saving returned %r byte file to cache: %s' % (response.stream.length, destFile.path))
+
+ if destFile.exists():
+ log.msg('File already exists, removing: %s' % destFile.path)
+ destFile.remove()
+ elif not destFile.parent().exists():
+ destFile.parent().makedirs()
+
+ root, ext = os.path.splitext(destFile.basename())
+ if root.lower() in DECOMPRESS_FILES and ext.lower() in DECOMPRESS_EXTS:
+ ext = ext.lower()
+ decFile = destFile.sibling(root)
+ log.msg('Decompressing to: %s' % decFile.path)
+ if decFile.exists():
+ log.msg('File already exists, removing: %s' % decFile.path)
+ decFile.remove()
+ else:
+ ext = None
+ decFile = None
+
+ orig_stream = response.stream
+ response.stream = ProxyFileStream(orig_stream, destFile, hash, ext, decFile)
+ response.stream.doneDefer.addCallback(self._save_complete, url, destFile,
+ response.headers.getHeader('Last-Modified'),
+ ext, decFile)
+ response.stream.doneDefer.addErrback(self.save_error, url)
+ return response
+
+ def _save_complete(self, hash, url, destFile, modtime = None, ext = None, decFile = None):
+ """Update the modification time and AptPackages."""
+ if modtime:
+ os.utime(destFile.path, (modtime, modtime))
+ if ext:
+ os.utime(decFile.path, (modtime, modtime))
+
+ result = hash.verify()
+ if result or result is None:
+ if result:
+ log.msg('Hashes match: %s' % url)
+ else:
+ log.msg('Hashed file to %s: %s' % (hash.hexdigest(), url))
+
+ urlpath, newdir = self.db.storeFile(destFile, hash.digest(), self.cache_dir)
+ log.msg('now avaliable at %s: %s' % (urlpath, url))
+
+ if self.manager:
+ self.manager.new_cached_file(url, destFile, hash, urlpath)
+ if ext:
+ self.manager.new_cached_file(url[:-len(ext)], decFile, None, urlpath)
+ else:
+ log.msg("Hashes don't match %s != %s: %s" % (hash.hexexpected(), hash.hexdigest(), url))
+ destFile.remove()
+ if ext:
+ decFile.remove()
+
+ def save_error(self, failure, url):
+ """An error has occurred in downloadign or saving the file."""
+ log.msg('Error occurred downloading %s' % url)
+ log.err(failure)
+ return failure
+
+class TestMirrorManager(unittest.TestCase):
+ """Unit tests for the mirror manager."""
+
+ timeout = 20
+ pending_calls = []
+ client = None
+
+ def setUp(self):
+ self.client = CacheManager(FilePath('/tmp/.apt-dht'))
+
+ def tearDown(self):
+ for p in self.pending_calls:
+ if p.active():
+ p.cancel()
+ self.client = None
+
\ No newline at end of file
projects / quix0rs-apt-p2p.git / commitdiff