Mercurial > hg
annotate mercurial/appendfile.py @ 2174:3044a3fdae76
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author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Mon, 01 May 2006 19:17:34 +0200 |
parents | d821918e3bee |
children | 6886bc0b77af |
rev | line source |
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1 # appendfile.py - special classes to make repo updates atomic |
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2 # |
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3 # Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com> |
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4 # |
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5 # This software may be used and distributed according to the terms |
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6 # of the GNU General Public License, incorporated herein by reference. |
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7 |
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8 from demandload import * |
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9 demandload(globals(), "cStringIO changelog errno manifest os tempfile") |
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10 |
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11 # writes to metadata files are ordered. reads: changelog, manifest, |
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12 # normal files. writes: normal files, manifest, changelog. |
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13 |
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14 # manifest contains pointers to offsets in normal files. changelog |
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15 # contains pointers to offsets in manifest. if reader reads old |
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16 # changelog while manifest or normal files are written, it has no |
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17 # pointers into new parts of those files that are maybe not consistent |
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18 # yet, so will not read them. |
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19 |
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20 # localrepo.addchangegroup thinks it writes changelog first, then |
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21 # manifest, then normal files (this is order they are available, and |
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22 # needed for computing linkrev fields), but uses appendfile to hide |
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23 # updates from readers. data not written to manifest or changelog |
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24 # until all normal files updated. write manifest first, then |
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25 # changelog. |
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26 |
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27 # with this write ordering, readers cannot see inconsistent view of |
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28 # repo during update. |
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29 |
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30 class appendfile(object): |
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31 '''implement enough of file protocol to append to revlog file. |
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32 appended data is written to temp file. reads and seeks span real |
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33 file and temp file. readers cannot see appended data until |
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34 writedata called.''' |
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35 |
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36 def __init__(self, fp, tmpname): |
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37 if tmpname: |
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38 self.tmpname = tmpname |
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39 self.tmpfp = open(self.tmpname, 'ab+') |
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40 else: |
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41 fd, self.tmpname = tempfile.mkstemp(prefix="hg-appendfile-") |
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42 self.tmpfp = os.fdopen(fd, 'ab+') |
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43 self.realfp = fp |
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44 self.offset = fp.tell() |
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45 # real file is not written by anyone else. cache its size so |
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46 # seek and read can be fast. |
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47 self.realsize = os.fstat(fp.fileno()).st_size |
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48 |
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49 def end(self): |
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50 self.tmpfp.flush() # make sure the stat is correct |
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51 return self.realsize + os.fstat(self.tmpfp.fileno()).st_size |
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52 |
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53 def tell(self): |
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54 return self.offset |
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55 |
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56 def flush(self): |
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57 self.tmpfp.flush() |
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58 |
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59 def close(self): |
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60 self.realfp.close() |
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61 self.tmpfp.close() |
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62 |
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63 def seek(self, offset, whence=0): |
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64 '''virtual file offset spans real file and temp file.''' |
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65 if whence == 0: |
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66 self.offset = offset |
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67 elif whence == 1: |
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68 self.offset += offset |
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69 elif whence == 2: |
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70 self.offset = self.end() + offset |
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71 |
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72 if self.offset < self.realsize: |
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73 self.realfp.seek(self.offset) |
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74 else: |
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75 self.tmpfp.seek(self.offset - self.realsize) |
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76 |
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77 def read(self, count=-1): |
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78 '''only trick here is reads that span real file and temp file.''' |
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79 fp = cStringIO.StringIO() |
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80 old_offset = self.offset |
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81 if self.offset < self.realsize: |
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82 s = self.realfp.read(count) |
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83 fp.write(s) |
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84 self.offset += len(s) |
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85 if count > 0: |
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86 count -= len(s) |
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87 if count != 0: |
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88 if old_offset != self.offset: |
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89 self.tmpfp.seek(self.offset - self.realsize) |
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90 s = self.tmpfp.read(count) |
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91 fp.write(s) |
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92 self.offset += len(s) |
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93 return fp.getvalue() |
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94 |
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95 def write(self, s): |
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96 '''append to temp file.''' |
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97 self.tmpfp.seek(0, 2) |
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98 self.tmpfp.write(s) |
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99 # all writes are appends, so offset must go to end of file. |
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100 self.offset = self.realsize + self.tmpfp.tell() |
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101 |
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102 class appendopener(object): |
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103 '''special opener for files that only read or append.''' |
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104 |
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105 def __init__(self, opener): |
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106 self.realopener = opener |
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107 # key: file name, value: appendfile name |
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108 self.tmpnames = {} |
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109 |
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110 def __call__(self, name, mode='r'): |
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111 '''open file.''' |
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112 |
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113 assert mode in 'ra+' |
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114 try: |
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115 realfp = self.realopener(name, 'r') |
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116 except IOError, err: |
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117 if err.errno != errno.ENOENT: raise |
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118 realfp = self.realopener(name, 'w+') |
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119 tmpname = self.tmpnames.get(name) |
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120 fp = appendfile(realfp, tmpname) |
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121 if tmpname is None: |
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122 self.tmpnames[name] = fp.tmpname |
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123 return fp |
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124 |
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125 def writedata(self): |
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126 '''copy data from temp files to real files.''' |
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127 # write .d file before .i file. |
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128 tmpnames = self.tmpnames.items() |
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129 tmpnames.sort() |
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130 for name, tmpname in tmpnames: |
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131 fp = open(tmpname, 'rb') |
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132 s = fp.read() |
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133 fp.close() |
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134 os.unlink(tmpname) |
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135 fp = self.realopener(name, 'a') |
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136 fp.write(s) |
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137 fp.close() |
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138 |
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139 # files for changelog and manifest are in different appendopeners, so |
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140 # not mixed up together. |
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141 |
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142 class appendchangelog(changelog.changelog, appendopener): |
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143 def __init__(self, opener, version): |
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144 appendopener.__init__(self, opener) |
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145 changelog.changelog.__init__(self, self, version) |
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146 def checkinlinesize(self, fp, tr): |
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147 return |
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148 |
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149 class appendmanifest(manifest.manifest, appendopener): |
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150 def __init__(self, opener, version): |
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151 appendopener.__init__(self, opener) |
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152 manifest.manifest.__init__(self, self, version) |
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153 def checkinlinesize(self, fp, tr): |
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154 return |