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Diffstat (limited to 'pyload/network/HTTPChunk.py')
| -rw-r--r-- | pyload/network/HTTPChunk.py | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/pyload/network/HTTPChunk.py b/pyload/network/HTTPChunk.py new file mode 100644 index 000000000..4389aef28 --- /dev/null +++ b/pyload/network/HTTPChunk.py @@ -0,0 +1,298 @@ +#!/usr/bin/env python +# -*- coding: utf-8 -*- +""" + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, + or (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + See the GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, see <http://www.gnu.org/licenses/>. + + @author: RaNaN +""" +from os import remove, stat, fsync +from os.path import exists +from time import sleep +from re import search + +import codecs +import pycurl + +from pyload.utils import remove_chars +from pyload.utils.fs import fs_encode + +from HTTPRequest import HTTPRequest + +class WrongFormat(Exception): + pass + + +class ChunkInfo(): + def __init__(self, name): + self.name = unicode(name) + self.size = 0 + self.resume = False + self.chunks = [] + + def __repr__(self): + ret = "ChunkInfo: %s, %s\n" % (self.name, self.size) + for i, c in enumerate(self.chunks): + ret += "%s# %s\n" % (i, c[1]) + + return ret + + def setSize(self, size): + self.size = int(size) + + def addChunk(self, name, range): + self.chunks.append((name, range)) + + def clear(self): + self.chunks = [] + + def createChunks(self, chunks): + self.clear() + chunk_size = self.size / chunks + + current = 0 + for i in range(chunks): + end = self.size - 1 if (i == chunks - 1) else current + chunk_size + self.addChunk("%s.chunk%s" % (self.name, i), (current, end)) + current += chunk_size + 1 + + + def save(self): + fs_name = fs_encode("%s.chunks" % self.name) + fh = codecs.open(fs_name, "w", "utf_8") + fh.write("name:%s\n" % self.name) + fh.write("size:%s\n" % self.size) + for i, c in enumerate(self.chunks): + fh.write("#%d:\n" % i) + fh.write("\tname:%s\n" % c[0]) + fh.write("\trange:%i-%i\n" % c[1]) + fh.close() + + @staticmethod + def load(name): + fs_name = fs_encode("%s.chunks" % name) + if not exists(fs_name): + raise IOError() + fh = codecs.open(fs_name, "r", "utf_8") + name = fh.readline()[:-1] + size = fh.readline()[:-1] + if name.startswith("name:") and size.startswith("size:"): + name = name[5:] + size = size[5:] + else: + fh.close() + raise WrongFormat() + ci = ChunkInfo(name) + ci.loaded = True + ci.setSize(size) + while True: + if not fh.readline(): #skip line + break + name = fh.readline()[1:-1] + range = fh.readline()[1:-1] + if name.startswith("name:") and range.startswith("range:"): + name = name[5:] + range = range[6:].split("-") + else: + raise WrongFormat() + + ci.addChunk(name, (long(range[0]), long(range[1]))) + fh.close() + return ci + + def remove(self): + fs_name = fs_encode("%s.chunks" % self.name) + if exists(fs_name): remove(fs_name) + + def getCount(self): + return len(self.chunks) + + def getChunkName(self, index): + return self.chunks[index][0] + + def getChunkRange(self, index): + return self.chunks[index][1] + + +class HTTPChunk(HTTPRequest): + def __init__(self, id, parent, range=None, resume=False): + self.id = id + self.p = parent # HTTPDownload instance + self.range = range # tuple (start, end) + self.resume = resume + self.log = parent.log + + self.size = range[1] - range[0] if range else -1 + self.arrived = 0 + self.lastURL = self.p.referer + + self.c = pycurl.Curl() + + self.header = "" + self.headerParsed = False #indicates if the header has been processed + + self.fp = None #file handle + + self.initHandle() + self.setInterface(self.p.options) + + self.BOMChecked = False # check and remove byte order mark + + self.rep = None + + self.sleep = 0.000 + self.lastSize = 0 + + def __repr__(self): + return "<HTTPChunk id=%d, size=%d, arrived=%d>" % (self.id, self.size, self.arrived) + + @property + def cj(self): + return self.p.cj + + def getHandle(self): + """ returns a Curl handle ready to use for perform/multiperform """ + + self.setRequestContext(self.p.url, self.p.get, self.p.post, self.p.referer, self.p.cj) + self.c.setopt(pycurl.WRITEFUNCTION, self.writeBody) + self.c.setopt(pycurl.HEADERFUNCTION, self.writeHeader) + + # request all bytes, since some servers in russia seems to have a defect arihmetic unit + + fs_name = fs_encode(self.p.info.getChunkName(self.id)) + if self.resume: + self.fp = open(fs_name, "ab") + self.arrived = self.fp.tell() + if not self.arrived: + self.arrived = stat(fs_name).st_size + + if self.range: + #do nothing if chunk already finished + if self.arrived + self.range[0] >= self.range[1]: return None + + if self.id == len(self.p.info.chunks) - 1: #as last chunk dont set end range, so we get everything + range = "%i-" % (self.arrived + self.range[0]) + else: + range = "%i-%i" % (self.arrived + self.range[0], min(self.range[1] + 1, self.p.size - 1)) + + self.log.debug("Chunked resume with range %s" % range) + self.c.setopt(pycurl.RANGE, range) + else: + self.log.debug("Resume File from %i" % self.arrived) + self.c.setopt(pycurl.RESUME_FROM, self.arrived) + + else: + if self.range: + if self.id == len(self.p.info.chunks) - 1: # see above + range = "%i-" % self.range[0] + else: + range = "%i-%i" % (self.range[0], min(self.range[1] + 1, self.p.size - 1)) + + self.log.debug("Chunked with range %s" % range) + self.c.setopt(pycurl.RANGE, range) + + self.fp = open(fs_name, "wb") + + return self.c + + def writeHeader(self, buf): + self.header += buf + #@TODO forward headers?, this is possibly unneeded, when we just parse valid 200 headers + # as first chunk, we will parse the headers + if not self.range and self.header.endswith("\r\n\r\n"): + self.parseHeader() + elif not self.range and buf.startswith("150") and "data connection" in buf: #ftp file size parsing + size = search(r"(\d+) bytes", buf) + if size: + self.p.size = int(size.group(1)) + self.p.chunkSupport = True + + self.headerParsed = True + + def writeBody(self, buf): + #ignore BOM, it confuses unrar + if not self.BOMChecked: + if [ord(b) for b in buf[:3]] == [239, 187, 191]: + buf = buf[3:] + self.BOMChecked = True + + size = len(buf) + + self.arrived += size + + self.fp.write(buf) + + if self.p.bucket: + sleep(self.p.bucket.consumed(size)) + else: + # Avoid small buffers, increasing sleep time slowly if buffer size gets smaller + # otherwise reduce sleep time percentile (values are based on tests) + # So in general cpu time is saved without reducing bandwidth too much + + if size < self.lastSize: + self.sleep += 0.002 + else: + self.sleep *= 0.7 + + self.lastSize = size + + sleep(self.sleep) + + if self.range and self.arrived > self.size: + return 0 #close if we have enough data + + + def parseHeader(self): + """parse data from received header""" + for orgline in self.decodeResponse(self.header).splitlines(): + line = orgline.strip().lower() + if line.startswith("accept-ranges") and "bytes" in line: + self.p.chunkSupport = True + + if "content-disposition" in line: + + m = search("filename(?P<type>=|\*=(?P<enc>.+)'')(?P<name>.*)", line) + if m: + name = remove_chars(m.groupdict()['name'], "\"';/").strip() + self.p._name = name + self.log.debug("Content-Disposition: %s" % name) + + if not self.resume and line.startswith("content-length"): + self.p.size = int(line.split(":")[1]) + + self.headerParsed = True + + def stop(self): + """The download will not proceed after next call of writeBody""" + self.range = [0,0] + self.size = 0 + + def resetRange(self): + """ Reset the range, so the download will load all data available """ + self.range = None + + def setRange(self, range): + self.range = range + self.size = range[1] - range[0] + + def flushFile(self): + """ flush and close file """ + self.fp.flush() + fsync(self.fp.fileno()) #make sure everything was written to disk + self.fp.close() #needs to be closed, or merging chunks will fail + + def close(self): + """ closes everything, unusable after this """ + if self.fp: self.fp.close() + self.c.close() + if hasattr(self, "p"): del self.p |