Mercurial > hg
annotate mercurial/transaction.py @ 17672:474047947b8f
clfilter: make the revlog class responsible of all its iteration
This prepares changelog level filtering. We need the algorithms used in revlog to
work on a subset of revisions. To achieve this, the use of explicit range of
revision is banned. `range` and `xrange` calls are replaced by a `revlog.irevs`
method. Filtered super class can then overwrite the `irevs` method to filter out
revision.
author | Pierre-Yves David <pierre-yves.david@logilab.fr> |
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date | Thu, 20 Sep 2012 19:00:59 +0200 |
parents | e7cfe3587ea4 |
children | a3378a1b0a05 |
rev | line source |
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1 # transaction.py - simple journaling scheme for mercurial |
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2 # |
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3 # This transaction scheme is intended to gracefully handle program |
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4 # errors and interruptions. More serious failures like system crashes |
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5 # can be recovered with an fsck-like tool. As the whole repository is |
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6 # effectively log-structured, this should amount to simply truncating |
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7 # anything that isn't referenced in the changelog. |
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8 # |
2859 | 9 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
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10 # |
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11 # This software may be used and distributed according to the terms of the |
10263 | 12 # GNU General Public License version 2 or any later version. |
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13 |
3891 | 14 from i18n import _ |
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15 import os, errno |
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16 import error, util |
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17 |
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18 def active(func): |
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19 def _active(self, *args, **kwds): |
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20 if self.count == 0: |
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21 raise error.Abort(_( |
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22 'cannot use transaction when it is already committed/aborted')) |
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23 return func(self, *args, **kwds) |
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24 return _active |
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25 |
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26 def _playback(journal, report, opener, entries, unlink=True): |
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27 for f, o, ignore in entries: |
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28 if o or not unlink: |
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29 try: |
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30 fp = opener(f, 'a') |
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31 fp.truncate(o) |
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32 fp.close() |
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33 except IOError: |
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34 report(_("failed to truncate %s\n") % f) |
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35 raise |
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36 else: |
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37 try: |
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38 fp = opener(f) |
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39 fn = fp.name |
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40 fp.close() |
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41 util.unlink(fn) |
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42 except (IOError, OSError), inst: |
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43 if inst.errno != errno.ENOENT: |
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44 raise |
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45 util.unlink(journal) |
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46 |
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47 class transaction(object): |
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48 def __init__(self, report, opener, journal, after=None, createmode=None): |
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49 self.count = 1 |
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50 self.usages = 1 |
582 | 51 self.report = report |
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52 self.opener = opener |
95 | 53 self.after = after |
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54 self.entries = [] |
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55 self.map = {} |
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56 self.journal = journal |
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57 self._queue = [] |
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58 |
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59 self.file = util.posixfile(self.journal, "w") |
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60 if createmode is not None: |
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61 os.chmod(self.journal, createmode & 0666) |
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62 |
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63 def __del__(self): |
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64 if self.journal: |
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65 self._abort() |
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66 |
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67 @active |
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68 def startgroup(self): |
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69 self._queue.append([]) |
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70 |
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71 @active |
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72 def endgroup(self): |
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73 q = self._queue.pop() |
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74 d = ''.join(['%s\0%d\n' % (x[0], x[1]) for x in q]) |
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75 self.entries.extend(q) |
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76 self.file.write(d) |
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77 self.file.flush() |
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78 |
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79 @active |
2084 | 80 def add(self, file, offset, data=None): |
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81 if file in self.map: |
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82 return |
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83 if self._queue: |
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84 self._queue[-1].append((file, offset, data)) |
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85 return |
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86 |
2084 | 87 self.entries.append((file, offset, data)) |
88 self.map[file] = len(self.entries) - 1 | |
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89 # add enough data to the journal to do the truncate |
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90 self.file.write("%s\0%d\n" % (file, offset)) |
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91 self.file.flush() |
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92 |
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93 @active |
2084 | 94 def find(self, file): |
95 if file in self.map: | |
96 return self.entries[self.map[file]] | |
97 return None | |
98 | |
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99 @active |
2084 | 100 def replace(self, file, offset, data=None): |
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101 ''' |
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102 replace can only replace already committed entries |
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103 that are not pending in the queue |
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104 ''' |
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105 |
2084 | 106 if file not in self.map: |
107 raise KeyError(file) | |
108 index = self.map[file] | |
109 self.entries[index] = (file, offset, data) | |
110 self.file.write("%s\0%d\n" % (file, offset)) | |
111 self.file.flush() | |
112 | |
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113 @active |
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114 def nest(self): |
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115 self.count += 1 |
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116 self.usages += 1 |
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117 return self |
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118 |
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119 def release(self): |
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120 if self.count > 0: |
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121 self.usages -= 1 |
11685 | 122 # if the transaction scopes are left without being closed, fail |
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123 if self.count > 0 and self.usages == 0: |
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124 self._abort() |
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125 |
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126 def running(self): |
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127 return self.count > 0 |
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128 |
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129 @active |
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130 def close(self): |
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131 '''commit the transaction''' |
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132 self.count -= 1 |
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133 if self.count != 0: |
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134 return |
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135 self.file.close() |
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136 self.entries = [] |
95 | 137 if self.after: |
785 | 138 self.after() |
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139 if os.path.isfile(self.journal): |
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140 util.unlink(self.journal) |
573 | 141 self.journal = None |
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142 |
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143 @active |
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144 def abort(self): |
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145 '''abort the transaction (generally called on error, or when the |
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146 transaction is not explicitly committed before going out of |
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147 scope)''' |
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148 self._abort() |
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149 |
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150 def _abort(self): |
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151 self.count = 0 |
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152 self.usages = 0 |
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153 self.file.close() |
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154 |
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155 try: |
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156 if not self.entries: |
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157 if self.journal: |
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158 util.unlink(self.journal) |
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159 return |
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160 |
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161 self.report(_("transaction abort!\n")) |
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162 |
108 | 163 try: |
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164 _playback(self.journal, self.report, self.opener, |
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165 self.entries, False) |
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166 self.report(_("rollback completed\n")) |
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167 except Exception: |
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168 self.report(_("rollback failed - please run hg recover\n")) |
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169 finally: |
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170 self.journal = None |
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171 |
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172 |
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173 def rollback(opener, file, report): |
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174 entries = [] |
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175 |
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176 fp = util.posixfile(file) |
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177 lines = fp.readlines() |
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178 fp.close() |
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179 for l in lines: |
162 | 180 f, o = l.split('\0') |
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181 entries.append((f, int(o), None)) |
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182 |
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183 _playback(file, report, opener, entries) |