Mercurial > hg > pyhgsh

annotate mercurial/appendfile.py @ 2195:f027bc2d3f4a

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author TK Soh <teekaysoh@yahoo.com>
date Thu, 04 May 2006 14:01:55 +0200
parents 6886bc0b77af
children ef3c039e7ab8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 errno manifest os tempfile util")
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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 = util.posixfile(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 os.close(fd)
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43 self.tmpfp = util.posixfile(self.tmpname, 'ab+')
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44 self.realfp = fp
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45 self.offset = fp.tell()
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46 # real file is not written by anyone else. cache its size so
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47 # seek and read can be fast.
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48 self.realsize = util.fstat(fp).st_size
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49 self.name = fp.name
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50
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51 def end(self):
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52 self.tmpfp.flush() # make sure the stat is correct
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53 return self.realsize + util.fstat(self.tmpfp).st_size
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54
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55 def tell(self):
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56 return self.offset
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57
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58 def flush(self):
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59 self.tmpfp.flush()
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60
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61 def close(self):
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62 self.realfp.close()
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63 self.tmpfp.close()
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64
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65 def seek(self, offset, whence=0):
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66 '''virtual file offset spans real file and temp file.'''
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67 if whence == 0:
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68 self.offset = offset
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69 elif whence == 1:
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70 self.offset += offset
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71 elif whence == 2:
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72 self.offset = self.end() + offset
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73
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74 if self.offset < self.realsize:
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75 self.realfp.seek(self.offset)
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76 else:
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77 self.tmpfp.seek(self.offset - self.realsize)
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78
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79 def read(self, count=-1):
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80 '''only trick here is reads that span real file and temp file.'''
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81 fp = cStringIO.StringIO()
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82 old_offset = self.offset
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83 if self.offset < self.realsize:
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84 s = self.realfp.read(count)
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85 fp.write(s)
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86 self.offset += len(s)
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87 if count > 0:
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88 count -= len(s)
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89 if count != 0:
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90 if old_offset != self.offset:
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91 self.tmpfp.seek(self.offset - self.realsize)
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92 s = self.tmpfp.read(count)
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93 fp.write(s)
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94 self.offset += len(s)
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95 return fp.getvalue()
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96
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97 def write(self, s):
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98 '''append to temp file.'''
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99 self.tmpfp.seek(0, 2)
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100 self.tmpfp.write(s)
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101 # all writes are appends, so offset must go to end of file.
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102 self.offset = self.realsize + self.tmpfp.tell()
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103
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104 class appendopener(object):
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105 '''special opener for files that only read or append.'''
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106
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107 def __init__(self, opener):
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108 self.realopener = opener
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109 # key: file name, value: appendfile name
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110 self.tmpnames = {}
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111
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112 def __call__(self, name, mode='r'):
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113 '''open file.'''
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114
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115 assert mode in 'ra+'
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116 try:
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117 realfp = self.realopener(name, 'r')
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118 except IOError, err:
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119 if err.errno != errno.ENOENT: raise
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120 realfp = self.realopener(name, 'w+')
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121 tmpname = self.tmpnames.get(name)
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122 fp = appendfile(realfp, tmpname)
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123 if tmpname is None:
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124 self.tmpnames[name] = fp.tmpname
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125 return fp
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126
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127 def writedata(self):
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128 '''copy data from temp files to real files.'''
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129 # write .d file before .i file.
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130 tmpnames = self.tmpnames.items()
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131 tmpnames.sort()
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132 for name, tmpname in tmpnames:
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133 fp = open(tmpname, 'rb')
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134 s = fp.read()
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135 fp.close()
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136 os.unlink(tmpname)
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137 fp = self.realopener(name, 'a')
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138 fp.write(s)
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139 fp.close()
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140
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141 # files for changelog and manifest are in different appendopeners, so
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142 # not mixed up together.
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143
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144 class appendchangelog(changelog.changelog, appendopener):
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145 def __init__(self, opener, version):
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146 appendopener.__init__(self, opener)
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147 changelog.changelog.__init__(self, self, version)
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148 def checkinlinesize(self, fp, tr):
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149 return
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150
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151 class appendmanifest(manifest.manifest, appendopener):
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152 def __init__(self, opener, version):
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153 appendopener.__init__(self, opener)
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154 manifest.manifest.__init__(self, self, version)
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155 def checkinlinesize(self, fp, tr):
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156 return