Mercurial > public > mercurial-scm > hg

annotate mercurial/appendfile.py @ 1999:fdb3a72ef664

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forgot to add new module.
author Vadim Gelfer <vadim.gelfer@gmail.com>
date Fri, 24 Mar 2006 09:23:11 -0800
parents
children db1eb0de286a
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rev   line source
1999
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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 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):
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37 fd, self.tmpname = tempfile.mkstemp()
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38 self.tmpfp = os.fdopen(fd, 'ab+')
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39 self.realfp = fp
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40 self.offset = 0
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41 # real file is not written by anyone else. cache its size so
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42 # seek and read can be fast.
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43 self.fpsize = os.fstat(fp.fileno()).st_size
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44
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45 def seek(self, offset):
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46 '''virtual file offset spans real file and temp file.'''
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47 self.offset = offset
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48 if self.offset < self.fpsize:
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49 self.realfp.seek(self.offset)
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50 else:
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51 self.tmpfp.seek(self.offset - self.fpsize)
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52
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53 def read(self, count=-1):
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54 '''only trick here is reads that span real file and temp file.'''
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55 fp = cStringIO.StringIO()
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56 old_offset = self.offset
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57 if self.offset < self.fpsize:
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58 s = self.realfp.read(count)
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59 fp.write(s)
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60 self.offset += len(s)
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61 if count > 0:
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62 count -= len(s)
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63 if count != 0:
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64 if old_offset != self.offset:
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65 self.tmpfp.seek(self.offset - self.fpsize)
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66 s = self.tmpfp.read(count)
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67 fp.write(s)
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68 self.offset += len(s)
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69 return fp.getvalue()
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70
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71 def write(self, s):
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72 '''append to temp file.'''
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73 self.tmpfp.write(s)
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74 # all writes are appends, so offset must go to end of file.
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75 self.offset = self.fpsize + self.tmpfp.tell()
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76
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77 def writedata(self):
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78 '''copy data from temp file to real file.'''
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79 self.tmpfp.seek(0)
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80 s = self.tmpfp.read()
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81 self.tmpfp.close()
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82 self.realfp.seek(0, 2)
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83 # small race here. we write all new data in one call, but
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84 # reader can see partial update due to python or os. file
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85 # locking no help: slow, not portable, not reliable over nfs.
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86 # only safe thing is write to temp file every time and rename,
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87 # but performance bad when manifest or changelog gets big.
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88 self.realfp.write(s)
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89 self.realfp.close()
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90
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91 def __del__(self):
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92 '''delete temp file even if exception raised.'''
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93 try: os.unlink(self.tmpname)
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94 except: pass
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95
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96 class sharedfile(object):
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97 '''let file objects share a single appendfile safely. each
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98 sharedfile has own offset, syncs up with appendfile offset before
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99 read and after read and write.'''
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100
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101 def __init__(self, fp):
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102 self.fp = fp
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103 self.offset = 0
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104
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105 def seek(self, offset):
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106 self.offset = offset
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107
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108 def read(self, count=-1):
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109 try:
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110 if self.offset != self.fp.offset:
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111 self.fp.seek(self.offset)
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112 return self.fp.read(count)
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113 finally:
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114 self.offset = self.fp.offset
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115
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116 def write(self, s):
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117 try:
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118 return self.fp.write(s)
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119 finally:
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120 self.offset = self.fp.offset
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121
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122 def close(self):
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123 # revlog wants this.
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124 pass
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125
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126 def flush(self):
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127 # revlog wants this.
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128 pass
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129
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130 def writedata(self):
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131 self.fp.writedata()
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132
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133 class appendopener(object):
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134 '''special opener for files that only read or append.'''
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135
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136 def __init__(self, opener):
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137 self.realopener = opener
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138 # key: file name, value: appendfile object
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139 self.fps = {}
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140
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141 def __call__(self, name, mode='r'):
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142 '''open file. return same cached appendfile object for every
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143 later call.'''
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144
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145 assert mode in 'ra'
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146 fp = self.fps.get(name)
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147 if fp is None:
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148 fp = appendfile(self.realopener(name, 'a+'))
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149 self.fps[name] = fp
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150 return sharedfile(fp)
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151
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152 def writedata(self):
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153 '''copy data from temp files to real files.'''
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154 # write .d file before .i file.
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155 fps = self.fps.items()
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156 fps.sort()
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157 for name, fp in fps:
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158 fp.writedata()
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159
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160 # files for changelog and manifest are in different appendopeners, so
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161 # not mixed up together.
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162
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163 class appendchangelog(changelog.changelog, appendopener):
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164 def __init__(self, opener):
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165 appendopener.__init__(self, opener)
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166 changelog.changelog.__init__(self, self)
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167
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168 class appendmanifest(manifest.manifest, appendopener):
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169 def __init__(self, opener):
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170 appendopener.__init__(self, opener)
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171 manifest.manifest.__init__(self, self)