Mercurial > hg
annotate mercurial/byterange.py @ 17817:b17be267b59c
scmutil: add function to validate new branch, tag, and bookmark names
For now the new function only checks to make sure the new label name
isn't a reserved name ('tip', '.', or 'null'). Eventually more of the
checks will be unified between the different types of labels.
The `tag` command is trivially updated to use it. Updating branches and
bookmarks to use it is slightly more invasive and thus reserved for
later patches.
author | Kevin Bullock <kbullock@ringworld.org> |
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date | Wed, 17 Oct 2012 16:34:46 -0500 |
parents | 31f32a96e1e3 |
children | 40f9472f5737 |
rev | line source |
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0
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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 |
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12 # License along with this library; if not, see |
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13 # <http://www.gnu.org/licenses/>. |
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14 |
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15 # This file is part of urlgrabber, a high-level cross-protocol url-grabber |
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16 # Copyright 2002-2004 Michael D. Stenner, Ryan Tomayko |
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17 |
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18 # $Id: byterange.py,v 1.9 2005/02/14 21:55:07 mstenner Exp $ |
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19 |
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20 import os |
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21 import stat |
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22 import urllib |
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23 import urllib2 |
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24 import email.Utils |
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25 |
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26 class RangeError(IOError): |
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27 """Error raised when an unsatisfiable range is requested.""" |
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28 pass |
575 | 29 |
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30 class HTTPRangeHandler(urllib2.BaseHandler): |
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31 """Handler that enables HTTP Range headers. |
575 | 32 |
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33 This was extremely simple. The Range header is a HTTP feature to |
575 | 34 begin with so all this class does is tell urllib2 that the |
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35 "206 Partial Content" response from the HTTP server is what we |
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36 expected. |
575 | 37 |
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38 Example: |
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39 import urllib2 |
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40 import byterange |
575 | 41 |
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42 range_handler = range.HTTPRangeHandler() |
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43 opener = urllib2.build_opener(range_handler) |
575 | 44 |
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45 # install it |
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46 urllib2.install_opener(opener) |
575 | 47 |
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48 # create Request and set Range header |
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49 req = urllib2.Request('http://www.python.org/') |
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50 req.header['Range'] = 'bytes=30-50' |
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51 f = urllib2.urlopen(req) |
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52 """ |
575 | 53 |
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54 def http_error_206(self, req, fp, code, msg, hdrs): |
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55 # 206 Partial Content Response |
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56 r = urllib.addinfourl(fp, hdrs, req.get_full_url()) |
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57 r.code = code |
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58 r.msg = msg |
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59 return r |
575 | 60 |
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61 def http_error_416(self, req, fp, code, msg, hdrs): |
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62 # HTTP's Range Not Satisfiable error |
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63 raise RangeError('Requested Range Not Satisfiable') |
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64 |
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65 class RangeableFileObject(object): |
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66 """File object wrapper to enable raw range handling. |
17507 | 67 This was implemented primarily for handling range |
575 | 68 specifications for file:// urls. This object effectively makes |
69 a file object look like it consists only of a range of bytes in | |
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70 the stream. |
575 | 71 |
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72 Examples: |
575 | 73 # expose 10 bytes, starting at byte position 20, from |
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74 # /etc/aliases. |
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75 >>> fo = RangeableFileObject(file('/etc/passwd', 'r'), (20,30)) |
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76 # seek seeks within the range (to position 23 in this case) |
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77 >>> fo.seek(3) |
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78 # tell tells where your at _within the range_ (position 3 in |
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79 # this case) |
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80 >>> fo.tell() |
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81 # read EOFs if an attempt is made to read past the last |
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82 # byte in the range. the following will return only 7 bytes. |
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83 >>> fo.read(30) |
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84 """ |
575 | 85 |
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86 def __init__(self, fo, rangetup): |
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87 """Create a RangeableFileObject. |
575 | 88 fo -- a file like object. only the read() method need be |
89 supported but supporting an optimized seek() is | |
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90 preferable. |
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91 rangetup -- a (firstbyte,lastbyte) tuple specifying the range |
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92 to work over. |
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93 The file object provided is assumed to be at byte offset 0. |
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94 """ |
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95 self.fo = fo |
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96 (self.firstbyte, self.lastbyte) = range_tuple_normalize(rangetup) |
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97 self.realpos = 0 |
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98 self._do_seek(self.firstbyte) |
575 | 99 |
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100 def __getattr__(self, name): |
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101 """This effectively allows us to wrap at the instance level. |
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102 Any attribute not found in _this_ object will be searched for |
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103 in self.fo. This includes methods.""" |
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104 return getattr(self.fo, name) |
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106 def tell(self): |
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107 """Return the position within the range. |
575 | 108 This is different from fo.seek in that position 0 is the |
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109 first byte position of the range tuple. For example, if |
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110 this object was created with a range tuple of (500,899), |
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111 tell() will return 0 when at byte position 500 of the file. |
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112 """ |
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113 return (self.realpos - self.firstbyte) |
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115 def seek(self, offset, whence=0): |
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116 """Seek within the byte range. |
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117 Positioning is identical to that described under tell(). |
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118 """ |
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119 assert whence in (0, 1, 2) |
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120 if whence == 0: # absolute seek |
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121 realoffset = self.firstbyte + offset |
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122 elif whence == 1: # relative seek |
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123 realoffset = self.realpos + offset |
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124 elif whence == 2: # absolute from end of file |
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125 # XXX: are we raising the right Error here? |
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126 raise IOError('seek from end of file not supported.') |
575 | 127 |
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128 # do not allow seek past lastbyte in range |
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129 if self.lastbyte and (realoffset >= self.lastbyte): |
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130 realoffset = self.lastbyte |
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132 self._do_seek(realoffset - self.realpos) |
575 | 133 |
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134 def read(self, size=-1): |
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135 """Read within the range. |
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136 This method will limit the size read based on the range. |
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137 """ |
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138 size = self._calc_read_size(size) |
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139 rslt = self.fo.read(size) |
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140 self.realpos += len(rslt) |
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141 return rslt |
575 | 142 |
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143 def readline(self, size=-1): |
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144 """Read lines 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.readline(size) |
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149 self.realpos += len(rslt) |
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150 return rslt |
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152 def _calc_read_size(self, size): |
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153 """Handles calculating the amount of data to read based on |
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154 the range. |
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155 """ |
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156 if self.lastbyte: |
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157 if size > -1: |
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158 if ((self.realpos + size) >= self.lastbyte): |
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159 size = (self.lastbyte - self.realpos) |
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160 else: |
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161 size = (self.lastbyte - self.realpos) |
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162 return size |
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164 def _do_seek(self, offset): |
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165 """Seek based on whether wrapped object supports seek(). |
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166 offset is relative to the current position (self.realpos). |
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167 """ |
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168 assert offset >= 0 |
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169 seek = getattr(self.fo, 'seek', self._poor_mans_seek) |
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170 seek(self.realpos + offset) |
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171 self.realpos += offset |
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173 def _poor_mans_seek(self, offset): |
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174 """Seek by calling the wrapped file objects read() method. |
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175 This is used for file like objects that do not have native |
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176 seek support. The wrapped objects read() method is called |
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177 to manually seek to the desired position. |
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178 offset -- read this number of bytes from the wrapped |
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179 file object. |
575 | 180 raise RangeError if we encounter EOF before reaching the |
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181 specified offset. |
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182 """ |
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183 pos = 0 |
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184 bufsize = 1024 |
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185 while pos < offset: |
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186 if (pos + bufsize) > offset: |
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187 bufsize = offset - pos |
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188 buf = self.fo.read(bufsize) |
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189 if len(buf) != bufsize: |
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190 raise RangeError('Requested Range Not Satisfiable') |
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191 pos += bufsize |
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192 |
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193 class FileRangeHandler(urllib2.FileHandler): |
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194 """FileHandler subclass that adds Range support. |
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195 This class handles Range headers exactly like an HTTP |
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196 server would. |
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197 """ |
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198 def open_local_file(self, req): |
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199 import mimetypes |
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200 import email |
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201 host = req.get_host() |
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202 file = req.get_selector() |
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203 localfile = urllib.url2pathname(file) |
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204 stats = os.stat(localfile) |
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205 size = stats[stat.ST_SIZE] |
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206 modified = email.Utils.formatdate(stats[stat.ST_MTIME]) |
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207 mtype = mimetypes.guess_type(file)[0] |
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208 if host: |
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209 host, port = urllib.splitport(host) |
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210 if port or socket.gethostbyname(host) not in self.get_names(): |
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211 raise urllib2.URLError('file not on local host') |
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212 fo = open(localfile,'rb') |
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213 brange = req.headers.get('Range', None) |
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214 brange = range_header_to_tuple(brange) |
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215 assert brange != () |
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216 if brange: |
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217 (fb, lb) = brange |
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218 if lb == '': |
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219 lb = size |
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220 if fb < 0 or fb > size or lb > size: |
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221 raise RangeError('Requested Range Not Satisfiable') |
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222 size = (lb - fb) |
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223 fo = RangeableFileObject(fo, (fb, lb)) |
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224 headers = email.message_from_string( |
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225 'Content-Type: %s\nContent-Length: %d\nLast-Modified: %s\n' % |
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226 (mtype or 'text/plain', size, modified)) |
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227 return urllib.addinfourl(fo, headers, 'file:'+file) |
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228 |
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229 |
575 | 230 # FTP Range Support |
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231 # Unfortunately, a large amount of base FTP code had to be copied |
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232 # from urllib and urllib2 in order to insert the FTP REST command. |
575 | 233 # Code modifications for range support have been commented as |
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234 # follows: |
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235 # -- range support modifications start/end here |
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236 |
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237 from urllib import splitport, splituser, splitpasswd, splitattr, \ |
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238 unquote, addclosehook, addinfourl |
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239 import ftplib |
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240 import socket |
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241 import sys |
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242 import mimetypes |
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243 import email |
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244 |
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245 class FTPRangeHandler(urllib2.FTPHandler): |
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246 def ftp_open(self, req): |
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247 host = req.get_host() |
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248 if not host: |
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249 raise IOError('ftp error', 'no host given') |
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250 host, port = splitport(host) |
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251 if port is None: |
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252 port = ftplib.FTP_PORT |
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253 else: |
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254 port = int(port) |
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255 |
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256 # username/password handling |
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257 user, host = splituser(host) |
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258 if user: |
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259 user, passwd = splitpasswd(user) |
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260 else: |
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261 passwd = None |
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262 host = unquote(host) |
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263 user = unquote(user or '') |
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264 passwd = unquote(passwd or '') |
575 | 265 |
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266 try: |
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267 host = socket.gethostbyname(host) |
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268 except socket.error, msg: |
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269 raise urllib2.URLError(msg) |
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270 path, attrs = splitattr(req.get_selector()) |
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271 dirs = path.split('/') |
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272 dirs = map(unquote, dirs) |
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273 dirs, file = dirs[:-1], dirs[-1] |
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274 if dirs and not dirs[0]: |
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275 dirs = dirs[1:] |
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276 try: |
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277 fw = self.connect_ftp(user, passwd, host, port, dirs) |
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278 type = file and 'I' or 'D' |
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279 for attr in attrs: |
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280 attr, value = splitattr(attr) |
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281 if attr.lower() == 'type' and \ |
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282 value in ('a', 'A', 'i', 'I', 'd', 'D'): |
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283 type = value.upper() |
575 | 284 |
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285 # -- range support modifications start here |
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286 rest = None |
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287 range_tup = range_header_to_tuple(req.headers.get('Range', None)) |
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288 assert range_tup != () |
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289 if range_tup: |
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290 (fb, lb) = range_tup |
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291 if fb > 0: |
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292 rest = fb |
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293 # -- range support modifications end here |
575 | 294 |
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295 fp, retrlen = fw.retrfile(file, type, rest) |
575 | 296 |
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297 # -- range support modifications start here |
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298 if range_tup: |
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299 (fb, lb) = range_tup |
575 | 300 if lb == '': |
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301 if retrlen is None or retrlen == 0: |
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302 raise RangeError('Requested Range Not Satisfiable due' |
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303 ' to unobtainable file length.') |
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304 lb = retrlen |
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305 retrlen = lb - fb |
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306 if retrlen < 0: |
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307 # beginning of range is larger than file |
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308 raise RangeError('Requested Range Not Satisfiable') |
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309 else: |
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310 retrlen = lb - fb |
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311 fp = RangeableFileObject(fp, (0, retrlen)) |
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312 # -- range support modifications end here |
575 | 313 |
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314 headers = "" |
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315 mtype = mimetypes.guess_type(req.get_full_url())[0] |
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316 if mtype: |
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317 headers += "Content-Type: %s\n" % mtype |
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318 if retrlen is not None and retrlen >= 0: |
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319 headers += "Content-Length: %d\n" % retrlen |
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320 headers = email.message_from_string(headers) |
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321 return addinfourl(fp, headers, req.get_full_url()) |
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322 except ftplib.all_errors, msg: |
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323 raise IOError('ftp error', msg), sys.exc_info()[2] |
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324 |
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325 def connect_ftp(self, user, passwd, host, port, dirs): |
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326 fw = ftpwrapper(user, passwd, host, port, dirs) |
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327 return fw |
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328 |
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329 class ftpwrapper(urllib.ftpwrapper): |
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330 # range support note: |
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331 # this ftpwrapper code is copied directly from |
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332 # urllib. The only enhancement is to add the rest |
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333 # argument and pass it on to ftp.ntransfercmd |
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334 def retrfile(self, file, type, rest=None): |
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335 self.endtransfer() |
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336 if type in ('d', 'D'): |
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337 cmd = 'TYPE A' |
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338 isdir = 1 |
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339 else: |
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340 cmd = 'TYPE ' + type |
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341 isdir = 0 |
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342 try: |
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343 self.ftp.voidcmd(cmd) |
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344 except ftplib.all_errors: |
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345 self.init() |
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346 self.ftp.voidcmd(cmd) |
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347 conn = None |
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348 if file and not isdir: |
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349 # Use nlst to see if the file exists at all |
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350 try: |
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351 self.ftp.nlst(file) |
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352 except ftplib.error_perm, reason: |
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353 raise IOError('ftp error', reason), sys.exc_info()[2] |
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354 # Restore the transfer mode! |
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355 self.ftp.voidcmd(cmd) |
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356 # Try to retrieve as a file |
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357 try: |
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358 cmd = 'RETR ' + file |
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359 conn = self.ftp.ntransfercmd(cmd, rest) |
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360 except ftplib.error_perm, reason: |
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361 if str(reason).startswith('501'): |
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362 # workaround for REST not supported error |
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363 fp, retrlen = self.retrfile(file, type) |
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364 fp = RangeableFileObject(fp, (rest,'')) |
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365 return (fp, retrlen) |
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366 elif not str(reason).startswith('550'): |
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367 raise IOError('ftp error', reason), sys.exc_info()[2] |
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368 if not conn: |
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369 # Set transfer mode to ASCII! |
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370 self.ftp.voidcmd('TYPE A') |
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371 # Try a directory listing |
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372 if file: |
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373 cmd = 'LIST ' + file |
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374 else: |
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375 cmd = 'LIST' |
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376 conn = self.ftp.ntransfercmd(cmd) |
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377 self.busy = 1 |
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378 # Pass back both a suitably decorated object and a retrieval length |
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379 return (addclosehook(conn[0].makefile('rb'), |
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380 self.endtransfer), conn[1]) |
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381 |
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382 |
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383 #################################################################### |
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384 # Range Tuple Functions |
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385 # XXX: These range tuple functions might go better in a class. |
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386 |
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387 _rangere = None |
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388 def range_header_to_tuple(range_header): |
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389 """Get a (firstbyte,lastbyte) tuple from a Range header value. |
575 | 390 |
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391 Range headers have the form "bytes=<firstbyte>-<lastbyte>". This |
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392 function pulls the firstbyte and lastbyte values and returns |
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393 a (firstbyte,lastbyte) tuple. If lastbyte is not specified in |
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394 the header value, it is returned as an empty string in the |
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395 tuple. |
575 | 396 |
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397 Return None if range_header is None |
575 | 398 Return () if range_header does not conform to the range spec |
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399 pattern. |
575 | 400 |
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401 """ |
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402 global _rangere |
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403 if range_header is None: |
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404 return None |
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405 if _rangere is None: |
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406 import re |
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407 _rangere = re.compile(r'^bytes=(\d{1,})-(\d*)') |
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408 match = _rangere.match(range_header) |
575 | 409 if match: |
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410 tup = range_tuple_normalize(match.group(1, 2)) |
575 | 411 if tup and tup[1]: |
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412 tup = (tup[0], tup[1]+1) |
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413 return tup |
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414 return () |
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415 |
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416 def range_tuple_to_header(range_tup): |
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417 """Convert a range tuple to a Range header value. |
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418 Return a string of the form "bytes=<firstbyte>-<lastbyte>" or None |
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419 if no range is needed. |
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420 """ |
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421 if range_tup is None: |
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422 return None |
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423 range_tup = range_tuple_normalize(range_tup) |
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424 if range_tup: |
575 | 425 if range_tup[1]: |
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426 range_tup = (range_tup[0], range_tup[1] - 1) |
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427 return 'bytes=%s-%s' % range_tup |
575 | 428 |
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429 def range_tuple_normalize(range_tup): |
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430 """Normalize a (first_byte,last_byte) range tuple. |
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431 Return a tuple whose first element is guaranteed to be an int |
575 | 432 and whose second element will be '' (meaning: the last byte) or |
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433 an int. Finally, return None if the normalized tuple == (0,'') |
17489 | 434 as that is equivalent to retrieving the entire file. |
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435 """ |
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436 if range_tup is None: |
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437 return None |
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438 # handle first byte |
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439 fb = range_tup[0] |
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440 if fb in (None, ''): |
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441 fb = 0 |
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442 else: |
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443 fb = int(fb) |
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444 # handle last byte |
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445 try: |
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446 lb = range_tup[1] |
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447 except IndexError: |
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448 lb = '' |
575 | 449 else: |
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parents:
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450 if lb is None: |
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parents:
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451 lb = '' |
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parents:
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452 elif lb != '': |
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453 lb = int(lb) |
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454 # check if range is over the entire file |
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455 if (fb, lb) == (0, ''): |
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parents:
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456 return None |
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457 # check that the range is valid |
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458 if lb < fb: |
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459 raise RangeError('Invalid byte range: %s-%s' % (fb, lb)) |
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parents:
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460 return (fb, lb) |