Mercurial > hg
annotate mercurial/appendfile.py @ 2089:cb99c711c59f
make appendfile simpler so it does not break with revlogng on windows.
it used to cache open files. this made revlogng break because it wants
to rename files when splitting .i into .i/.d, but cannot rename or unlink
open files on windows.
new code is bit slower, but safe on linux and windows. proper fix for
too many open/close of changelog/manifest belongs in different place.
can get 10% speed improvement back.
author | Vadim Gelfer <vadim.gelfer@gmail.com> |
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date | Wed, 19 Apr 2006 08:33:46 -0700 |
parents | 856f0ba200bc |
children | c62112815801 |
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() |
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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 fp = self.realopener(name, 'a') |
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135 fp.write(s) |
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136 fp.close() |
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137 |
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138 def __del__(self): |
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139 for tmpname in self.tmpnames.itervalues(): |
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140 os.unlink(tmpname) |
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141 |
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142 # files for changelog and manifest are in different appendopeners, so |
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143 # not mixed up together. |
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144 |
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145 class appendchangelog(changelog.changelog, appendopener): |
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146 def __init__(self, opener, version): |
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147 appendopener.__init__(self, opener) |
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148 changelog.changelog.__init__(self, self, version) |
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149 def checkinlinesize(self, fp, tr): |
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150 return |
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151 |
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152 class appendmanifest(manifest.manifest, appendopener): |
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153 def __init__(self, opener, version): |
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154 appendopener.__init__(self, opener) |
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155 manifest.manifest.__init__(self, self, version) |
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156 def checkinlinesize(self, fp, tr): |
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157 return |