Mercurial > hg
annotate mercurial/byterange.py @ 6139:989467e8e3a9
Fix bad behaviour when specifying an invalid date (issue700)
commit (aborts _after_ typing in a commit message)
backout (aborted after the initial revert)
tag (edited .hgtags and couldn't commit)
import (patch applied, then commit fails)
qnew (aborts on bad dates, but writes any valid date into the # Date header)
qrefresh (like qnew)
sign (like tag)
fetch (merge, merge, merge, merge, abort)
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Sun, 17 Feb 2008 21:34:28 +0100 |
parents | c301f15c965a |
children | 8fee8ff13d37 |
rev | line source |
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1 # This library is free software; you can redistribute it and/or |
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2 # modify it under the terms of the GNU Lesser General Public |
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3 # License as published by the Free Software Foundation; either |
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4 # version 2.1 of the License, or (at your option) any later version. |
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5 # |
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6 # This library is distributed in the hope that it will be useful, |
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7 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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8 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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9 # Lesser General Public License for more details. |
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10 # |
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11 # You should have received a copy of the GNU Lesser General Public |
575 | 12 # License along with this library; if not, write to the |
13 # Free Software Foundation, Inc., | |
14 # 59 Temple Place, Suite 330, | |
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15 # Boston, MA 02111-1307 USA |
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16 |
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17 # This file is part of urlgrabber, a high-level cross-protocol url-grabber |
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18 # Copyright 2002-2004 Michael D. Stenner, Ryan Tomayko |
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19 |
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20 # $Id: byterange.py,v 1.9 2005/02/14 21:55:07 mstenner Exp $ |
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21 |
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22 import os |
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23 import stat |
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24 import urllib |
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25 import urllib2 |
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26 import rfc822 |
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27 |
575 | 28 try: |
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29 from cStringIO import StringIO |
575 | 30 except ImportError, msg: |
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31 from StringIO import StringIO |
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32 |
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33 class RangeError(IOError): |
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34 """Error raised when an unsatisfiable range is requested.""" |
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35 pass |
575 | 36 |
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37 class HTTPRangeHandler(urllib2.BaseHandler): |
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38 """Handler that enables HTTP Range headers. |
575 | 39 |
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40 This was extremely simple. The Range header is a HTTP feature to |
575 | 41 begin with so all this class does is tell urllib2 that the |
42 "206 Partial Content" reponse from the HTTP server is what we | |
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43 expected. |
575 | 44 |
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45 Example: |
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46 import urllib2 |
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47 import byterange |
575 | 48 |
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49 range_handler = range.HTTPRangeHandler() |
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50 opener = urllib2.build_opener(range_handler) |
575 | 51 |
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52 # install it |
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53 urllib2.install_opener(opener) |
575 | 54 |
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55 # create Request and set Range header |
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56 req = urllib2.Request('http://www.python.org/') |
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57 req.header['Range'] = 'bytes=30-50' |
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58 f = urllib2.urlopen(req) |
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59 """ |
575 | 60 |
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61 def http_error_206(self, req, fp, code, msg, hdrs): |
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62 # 206 Partial Content Response |
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63 r = urllib.addinfourl(fp, hdrs, req.get_full_url()) |
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64 r.code = code |
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65 r.msg = msg |
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66 return r |
575 | 67 |
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68 def http_error_416(self, req, fp, code, msg, hdrs): |
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69 # HTTP's Range Not Satisfiable error |
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70 raise RangeError('Requested Range Not Satisfiable') |
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71 |
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72 class RangeableFileObject: |
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73 """File object wrapper to enable raw range handling. |
575 | 74 This was implemented primarilary for handling range |
75 specifications for file:// urls. This object effectively makes | |
76 a file object look like it consists only of a range of bytes in | |
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77 the stream. |
575 | 78 |
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79 Examples: |
575 | 80 # expose 10 bytes, starting at byte position 20, from |
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81 # /etc/aliases. |
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82 >>> fo = RangeableFileObject(file('/etc/passwd', 'r'), (20,30)) |
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83 # seek seeks within the range (to position 23 in this case) |
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84 >>> fo.seek(3) |
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85 # tell tells where your at _within the range_ (position 3 in |
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86 # this case) |
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87 >>> fo.tell() |
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88 # read EOFs if an attempt is made to read past the last |
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89 # byte in the range. the following will return only 7 bytes. |
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90 >>> fo.read(30) |
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91 """ |
575 | 92 |
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93 def __init__(self, fo, rangetup): |
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94 """Create a RangeableFileObject. |
575 | 95 fo -- a file like object. only the read() method need be |
96 supported but supporting an optimized seek() is | |
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97 preferable. |
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98 rangetup -- a (firstbyte,lastbyte) tuple specifying the range |
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99 to work over. |
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100 The file object provided is assumed to be at byte offset 0. |
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101 """ |
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102 self.fo = fo |
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103 (self.firstbyte, self.lastbyte) = range_tuple_normalize(rangetup) |
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104 self.realpos = 0 |
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105 self._do_seek(self.firstbyte) |
575 | 106 |
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107 def __getattr__(self, name): |
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108 """This effectively allows us to wrap at the instance level. |
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109 Any attribute not found in _this_ object will be searched for |
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110 in self.fo. This includes methods.""" |
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111 if hasattr(self.fo, name): |
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112 return getattr(self.fo, name) |
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113 raise AttributeError, name |
575 | 114 |
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115 def tell(self): |
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116 """Return the position within the range. |
575 | 117 This is different from fo.seek in that position 0 is the |
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118 first byte position of the range tuple. For example, if |
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119 this object was created with a range tuple of (500,899), |
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120 tell() will return 0 when at byte position 500 of the file. |
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121 """ |
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122 return (self.realpos - self.firstbyte) |
575 | 123 |
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124 def seek(self, offset, whence=0): |
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125 """Seek within the byte range. |
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126 Positioning is identical to that described under tell(). |
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127 """ |
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128 assert whence in (0, 1, 2) |
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129 if whence == 0: # absolute seek |
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130 realoffset = self.firstbyte + offset |
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131 elif whence == 1: # relative seek |
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132 realoffset = self.realpos + offset |
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133 elif whence == 2: # absolute from end of file |
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134 # XXX: are we raising the right Error here? |
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135 raise IOError('seek from end of file not supported.') |
575 | 136 |
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137 # do not allow seek past lastbyte in range |
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138 if self.lastbyte and (realoffset >= self.lastbyte): |
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139 realoffset = self.lastbyte |
575 | 140 |
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141 self._do_seek(realoffset - self.realpos) |
575 | 142 |
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143 def read(self, size=-1): |
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144 """Read within the range. |
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145 This method will limit the size read based on the range. |
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146 """ |
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147 size = self._calc_read_size(size) |
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148 rslt = self.fo.read(size) |
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149 self.realpos += len(rslt) |
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150 return rslt |
575 | 151 |
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152 def readline(self, size=-1): |
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153 """Read lines within the range. |
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154 This method will limit the size read based on the range. |
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155 """ |
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156 size = self._calc_read_size(size) |
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157 rslt = self.fo.readline(size) |
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158 self.realpos += len(rslt) |
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159 return rslt |
575 | 160 |
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161 def _calc_read_size(self, size): |
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162 """Handles calculating the amount of data to read based on |
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163 the range. |
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164 """ |
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165 if self.lastbyte: |
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166 if size > -1: |
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167 if ((self.realpos + size) >= self.lastbyte): |
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168 size = (self.lastbyte - self.realpos) |
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169 else: |
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170 size = (self.lastbyte - self.realpos) |
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171 return size |
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173 def _do_seek(self, offset): |
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174 """Seek based on whether wrapped object supports seek(). |
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175 offset is relative to the current position (self.realpos). |
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176 """ |
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177 assert offset >= 0 |
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178 if not hasattr(self.fo, 'seek'): |
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179 self._poor_mans_seek(offset) |
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180 else: |
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181 self.fo.seek(self.realpos + offset) |
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182 self.realpos += offset |
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184 def _poor_mans_seek(self, offset): |
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185 """Seek by calling the wrapped file objects read() method. |
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186 This is used for file like objects that do not have native |
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187 seek support. The wrapped objects read() method is called |
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188 to manually seek to the desired position. |
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189 offset -- read this number of bytes from the wrapped |
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190 file object. |
575 | 191 raise RangeError if we encounter EOF before reaching the |
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192 specified offset. |
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193 """ |
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194 pos = 0 |
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195 bufsize = 1024 |
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196 while pos < offset: |
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197 if (pos + bufsize) > offset: |
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198 bufsize = offset - pos |
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199 buf = self.fo.read(bufsize) |
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200 if len(buf) != bufsize: |
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201 raise RangeError('Requested Range Not Satisfiable') |
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202 pos += bufsize |
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203 |
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204 class FileRangeHandler(urllib2.FileHandler): |
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205 """FileHandler subclass that adds Range support. |
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206 This class handles Range headers exactly like an HTTP |
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207 server would. |
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208 """ |
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209 def open_local_file(self, req): |
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210 import mimetypes |
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211 import mimetools |
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212 host = req.get_host() |
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213 file = req.get_selector() |
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214 localfile = urllib.url2pathname(file) |
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215 stats = os.stat(localfile) |
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216 size = stats[stat.ST_SIZE] |
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217 modified = rfc822.formatdate(stats[stat.ST_MTIME]) |
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218 mtype = mimetypes.guess_type(file)[0] |
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219 if host: |
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220 host, port = urllib.splitport(host) |
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221 if port or socket.gethostbyname(host) not in self.get_names(): |
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222 raise urllib2.URLError('file not on local host') |
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223 fo = open(localfile,'rb') |
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224 brange = req.headers.get('Range', None) |
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225 brange = range_header_to_tuple(brange) |
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226 assert brange != () |
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227 if brange: |
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228 (fb, lb) = brange |
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229 if lb == '': |
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230 lb = size |
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231 if fb < 0 or fb > size or lb > size: |
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232 raise RangeError('Requested Range Not Satisfiable') |
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233 size = (lb - fb) |
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234 fo = RangeableFileObject(fo, (fb, lb)) |
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235 headers = mimetools.Message(StringIO( |
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236 'Content-Type: %s\nContent-Length: %d\nLast-Modified: %s\n' % |
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237 (mtype or 'text/plain', size, modified))) |
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238 return urllib.addinfourl(fo, headers, 'file:'+file) |
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239 |
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240 |
575 | 241 # FTP Range Support |
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242 # Unfortunately, a large amount of base FTP code had to be copied |
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243 # from urllib and urllib2 in order to insert the FTP REST command. |
575 | 244 # Code modifications for range support have been commented as |
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245 # follows: |
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246 # -- range support modifications start/end here |
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247 |
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248 from urllib import splitport, splituser, splitpasswd, splitattr, \ |
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249 unquote, addclosehook, addinfourl |
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250 import ftplib |
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251 import socket |
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252 import sys |
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253 import mimetypes |
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254 import mimetools |
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255 |
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256 class FTPRangeHandler(urllib2.FTPHandler): |
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257 def ftp_open(self, req): |
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258 host = req.get_host() |
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259 if not host: |
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260 raise IOError, ('ftp error', 'no host given') |
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261 host, port = splitport(host) |
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262 if port is None: |
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263 port = ftplib.FTP_PORT |
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264 |
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265 # username/password handling |
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266 user, host = splituser(host) |
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267 if user: |
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268 user, passwd = splitpasswd(user) |
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269 else: |
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270 passwd = None |
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271 host = unquote(host) |
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272 user = unquote(user or '') |
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273 passwd = unquote(passwd or '') |
575 | 274 |
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275 try: |
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276 host = socket.gethostbyname(host) |
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277 except socket.error, msg: |
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278 raise urllib2.URLError(msg) |
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279 path, attrs = splitattr(req.get_selector()) |
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280 dirs = path.split('/') |
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281 dirs = map(unquote, dirs) |
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282 dirs, file = dirs[:-1], dirs[-1] |
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283 if dirs and not dirs[0]: |
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284 dirs = dirs[1:] |
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285 try: |
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286 fw = self.connect_ftp(user, passwd, host, port, dirs) |
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287 type = file and 'I' or 'D' |
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288 for attr in attrs: |
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289 attr, value = splitattr(attr) |
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290 if attr.lower() == 'type' and \ |
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291 value in ('a', 'A', 'i', 'I', 'd', 'D'): |
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292 type = value.upper() |
575 | 293 |
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294 # -- range support modifications start here |
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295 rest = None |
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296 range_tup = range_header_to_tuple(req.headers.get('Range', None)) |
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297 assert range_tup != () |
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298 if range_tup: |
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299 (fb, lb) = range_tup |
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300 if fb > 0: |
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301 rest = fb |
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302 # -- range support modifications end here |
575 | 303 |
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304 fp, retrlen = fw.retrfile(file, type, rest) |
575 | 305 |
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306 # -- range support modifications start here |
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307 if range_tup: |
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308 (fb, lb) = range_tup |
575 | 309 if lb == '': |
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310 if retrlen is None or retrlen == 0: |
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311 raise RangeError('Requested Range Not Satisfiable due to unobtainable file length.') |
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312 lb = retrlen |
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313 retrlen = lb - fb |
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314 if retrlen < 0: |
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315 # beginning of range is larger than file |
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316 raise RangeError('Requested Range Not Satisfiable') |
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317 else: |
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318 retrlen = lb - fb |
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319 fp = RangeableFileObject(fp, (0, retrlen)) |
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320 # -- range support modifications end here |
575 | 321 |
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322 headers = "" |
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323 mtype = mimetypes.guess_type(req.get_full_url())[0] |
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324 if mtype: |
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325 headers += "Content-Type: %s\n" % mtype |
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326 if retrlen is not None and retrlen >= 0: |
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327 headers += "Content-Length: %d\n" % retrlen |
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328 sf = StringIO(headers) |
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329 headers = mimetools.Message(sf) |
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330 return addinfourl(fp, headers, req.get_full_url()) |
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331 except ftplib.all_errors, msg: |
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332 raise IOError, ('ftp error', msg), sys.exc_info()[2] |
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333 |
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334 def connect_ftp(self, user, passwd, host, port, dirs): |
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335 fw = ftpwrapper(user, passwd, host, port, dirs) |
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336 return fw |
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337 |
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338 class ftpwrapper(urllib.ftpwrapper): |
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339 # range support note: |
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340 # this ftpwrapper code is copied directly from |
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341 # urllib. The only enhancement is to add the rest |
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342 # argument and pass it on to ftp.ntransfercmd |
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343 def retrfile(self, file, type, rest=None): |
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344 self.endtransfer() |
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345 if type in ('d', 'D'): |
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346 cmd = 'TYPE A' |
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347 isdir = 1 |
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348 else: |
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349 cmd = 'TYPE ' + type |
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350 isdir = 0 |
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351 try: |
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352 self.ftp.voidcmd(cmd) |
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353 except ftplib.all_errors: |
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354 self.init() |
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355 self.ftp.voidcmd(cmd) |
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356 conn = None |
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357 if file and not isdir: |
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358 # Use nlst to see if the file exists at all |
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359 try: |
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360 self.ftp.nlst(file) |
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361 except ftplib.error_perm, reason: |
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362 raise IOError, ('ftp error', reason), sys.exc_info()[2] |
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363 # Restore the transfer mode! |
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364 self.ftp.voidcmd(cmd) |
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365 # Try to retrieve as a file |
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366 try: |
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367 cmd = 'RETR ' + file |
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368 conn = self.ftp.ntransfercmd(cmd, rest) |
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369 except ftplib.error_perm, reason: |
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370 if str(reason).startswith('501'): |
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371 # workaround for REST not supported error |
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372 fp, retrlen = self.retrfile(file, type) |
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373 fp = RangeableFileObject(fp, (rest,'')) |
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374 return (fp, retrlen) |
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375 elif not str(reason).startswith('550'): |
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376 raise IOError, ('ftp error', reason), sys.exc_info()[2] |
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377 if not conn: |
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378 # Set transfer mode to ASCII! |
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379 self.ftp.voidcmd('TYPE A') |
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380 # Try a directory listing |
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381 if file: |
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382 cmd = 'LIST ' + file |
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383 else: |
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384 cmd = 'LIST' |
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385 conn = self.ftp.ntransfercmd(cmd) |
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386 self.busy = 1 |
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387 # Pass back both a suitably decorated object and a retrieval length |
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388 return (addclosehook(conn[0].makefile('rb'), |
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389 self.endtransfer), conn[1]) |
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390 |
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391 |
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392 #################################################################### |
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393 # Range Tuple Functions |
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394 # XXX: These range tuple functions might go better in a class. |
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395 |
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396 _rangere = None |
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397 def range_header_to_tuple(range_header): |
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398 """Get a (firstbyte,lastbyte) tuple from a Range header value. |
575 | 399 |
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400 Range headers have the form "bytes=<firstbyte>-<lastbyte>". This |
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401 function pulls the firstbyte and lastbyte values and returns |
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402 a (firstbyte,lastbyte) tuple. If lastbyte is not specified in |
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403 the header value, it is returned as an empty string in the |
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404 tuple. |
575 | 405 |
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406 Return None if range_header is None |
575 | 407 Return () if range_header does not conform to the range spec |
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408 pattern. |
575 | 409 |
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410 """ |
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411 global _rangere |
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412 if range_header is None: |
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413 return None |
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414 if _rangere is None: |
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415 import re |
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416 _rangere = re.compile(r'^bytes=(\d{1,})-(\d*)') |
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417 match = _rangere.match(range_header) |
575 | 418 if match: |
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419 tup = range_tuple_normalize(match.group(1, 2)) |
575 | 420 if tup and tup[1]: |
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421 tup = (tup[0], tup[1]+1) |
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422 return tup |
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423 return () |
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424 |
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425 def range_tuple_to_header(range_tup): |
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426 """Convert a range tuple to a Range header value. |
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427 Return a string of the form "bytes=<firstbyte>-<lastbyte>" or None |
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428 if no range is needed. |
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429 """ |
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430 if range_tup is None: |
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431 return None |
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432 range_tup = range_tuple_normalize(range_tup) |
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433 if range_tup: |
575 | 434 if range_tup[1]: |
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435 range_tup = (range_tup[0], range_tup[1] - 1) |
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436 return 'bytes=%s-%s' % range_tup |
575 | 437 |
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438 def range_tuple_normalize(range_tup): |
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439 """Normalize a (first_byte,last_byte) range tuple. |
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440 Return a tuple whose first element is guaranteed to be an int |
575 | 441 and whose second element will be '' (meaning: the last byte) or |
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442 an int. Finally, return None if the normalized tuple == (0,'') |
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443 as that is equivelant to retrieving the entire file. |
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444 """ |
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445 if range_tup is None: |
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446 return None |
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447 # handle first byte |
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448 fb = range_tup[0] |
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449 if fb in (None, ''): |
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450 fb = 0 |
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451 else: |
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452 fb = int(fb) |
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mpm@selenic.com
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453 # handle last byte |
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white space and line break cleanups
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parents:
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454 try: |
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white space and line break cleanups
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parents:
674
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455 lb = range_tup[1] |
eb0b4a2d70a9
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parents:
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456 except IndexError: |
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parents:
674
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457 lb = '' |
575 | 458 else: |
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Thomas Arendsen Hein <thomas@intevation.de>
parents:
674
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459 if lb is None: |
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Thomas Arendsen Hein <thomas@intevation.de>
parents:
674
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460 lb = '' |
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parents:
674
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461 elif lb != '': |
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parents:
674
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462 lb = int(lb) |
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mpm@selenic.com
parents:
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463 # check if range is over the entire file |
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white space and line break cleanups
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parents:
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464 if (fb, lb) == (0, ''): |
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parents:
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465 return None |
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9117c6561b0b
Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
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466 # check that the range is valid |
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Thomas Arendsen Hein <thomas@intevation.de>
parents:
674
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467 if lb < fb: |
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Thomas Arendsen Hein <thomas@intevation.de>
parents:
674
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468 raise RangeError('Invalid byte range: %s-%s' % (fb, lb)) |
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white space and line break cleanups
Thomas Arendsen Hein <thomas@intevation.de>
parents:
674
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469 return (fb, lb) |