Mercurial > hg
annotate mercurial/transaction.py @ 21769:4a54d9f1b6b6
convert: define norepo in command decorator
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sun, 04 May 2014 22:02:25 -0700 |
parents | c77418938d05 |
children | e59b5e5918a5 |
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 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, backupentries, 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 opener.unlink(f) |
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39 except (IOError, OSError), inst: |
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40 if inst.errno != errno.ENOENT: |
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41 raise |
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42 |
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43 backupfiles = [] |
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44 for f, b, ignore in backupentries: |
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45 filepath = opener.join(f) |
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46 backuppath = opener.join(b) |
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47 try: |
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48 util.copyfile(backuppath, filepath) |
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49 backupfiles.append(b) |
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50 except IOError: |
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51 report(_("failed to recover %s\n") % f) |
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52 raise |
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53 |
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54 opener.unlink(journal) |
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55 backuppath = "%s.backupfiles" % journal |
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56 if opener.exists(backuppath): |
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57 opener.unlink(backuppath) |
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58 for f in backupfiles: |
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59 opener.unlink(f) |
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60 |
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61 class transaction(object): |
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62 def __init__(self, report, opener, journal, after=None, createmode=None, |
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63 onclose=None, onabort=None): |
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64 """Begin a new transaction |
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65 |
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66 Begins a new transaction that allows rolling back writes in the event of |
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67 an exception. |
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68 |
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69 * `after`: called after the transaction has been committed |
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70 * `createmode`: the mode of the journal file that will be created |
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71 * `onclose`: called as the transaction is closing, but before it is |
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72 closed |
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73 * `onabort`: called as the transaction is aborting, but before any files |
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74 have been truncated |
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75 """ |
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76 self.count = 1 |
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77 self.usages = 1 |
582 | 78 self.report = report |
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79 self.opener = opener |
95 | 80 self.after = after |
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81 self.onclose = onclose |
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82 self.onabort = onabort |
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83 self.entries = [] |
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84 self.backupentries = [] |
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85 self.map = {} |
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86 self.backupmap = {} |
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87 self.journal = journal |
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88 self._queue = [] |
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89 # a dict of arguments to be passed to hooks |
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90 self.hookargs = {} |
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91 |
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92 self.backupjournal = "%s.backupfiles" % journal |
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93 self.file = opener.open(self.journal, "w") |
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94 self.backupsfile = opener.open(self.backupjournal, 'w') |
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95 if createmode is not None: |
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96 opener.chmod(self.journal, createmode & 0666) |
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97 opener.chmod(self.backupjournal, createmode & 0666) |
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98 |
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99 def __del__(self): |
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100 if self.journal: |
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101 self._abort() |
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102 |
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103 @active |
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104 def startgroup(self): |
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105 self._queue.append(([], [])) |
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106 |
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107 @active |
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108 def endgroup(self): |
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109 q = self._queue.pop() |
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110 self.entries.extend(q[0]) |
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111 self.backupentries.extend(q[1]) |
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112 |
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113 offsets = [] |
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114 backups = [] |
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115 for f, o, _ in q[0]: |
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116 offsets.append((f, o)) |
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117 |
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118 for f, b, _ in q[1]: |
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119 backups.append((f, b)) |
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120 |
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121 d = ''.join(['%s\0%d\n' % (f, o) for f, o in offsets]) |
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122 self.file.write(d) |
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123 self.file.flush() |
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124 |
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125 d = ''.join(['%s\0%s\0' % (f, b) for f, b in backups]) |
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126 self.backupsfile.write(d) |
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127 self.backupsfile.flush() |
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128 |
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129 @active |
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131 if file in self.map or file in self.backupmap: |
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132 return |
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133 if self._queue: |
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134 self._queue[-1][0].append((file, offset, data)) |
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135 return |
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136 |
2084 | 137 self.entries.append((file, offset, data)) |
138 self.map[file] = len(self.entries) - 1 | |
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139 # add enough data to the journal to do the truncate |
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140 self.file.write("%s\0%d\n" % (file, offset)) |
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141 self.file.flush() |
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142 |
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143 @active |
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144 def addbackup(self, file, hardlink=True): |
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145 """Adds a backup of the file to the transaction |
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146 |
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147 Calling addbackup() creates a hardlink backup of the specified file |
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148 that is used to recover the file in the event of the transaction |
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149 aborting. |
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150 |
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151 * `file`: the file path, relative to .hg/store |
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152 * `hardlink`: use a hardlink to quickly create the backup |
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153 """ |
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154 |
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155 if file in self.map or file in self.backupmap: |
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156 return |
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157 backupfile = "journal.%s" % file |
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158 if self.opener.exists(file): |
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159 filepath = self.opener.join(file) |
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160 backuppath = self.opener.join(backupfile) |
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161 util.copyfiles(filepath, backuppath, hardlink=hardlink) |
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162 else: |
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163 self.add(file, 0) |
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164 return |
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165 |
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166 if self._queue: |
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167 self._queue[-1][1].append((file, backupfile)) |
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168 return |
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169 |
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170 self.backupentries.append((file, backupfile, None)) |
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171 self.backupmap[file] = len(self.backupentries) - 1 |
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172 self.backupsfile.write("%s\0%s\0" % (file, backupfile)) |
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173 self.backupsfile.flush() |
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174 |
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175 @active |
2084 | 176 def find(self, file): |
177 if file in self.map: | |
178 return self.entries[self.map[file]] | |
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179 if file in self.backupmap: |
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180 return self.backupentries[self.backupmap[file]] |
2084 | 181 return None |
182 | |
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183 @active |
2084 | 184 def replace(self, file, offset, data=None): |
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185 ''' |
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186 replace can only replace already committed entries |
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187 that are not pending in the queue |
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188 ''' |
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189 |
2084 | 190 if file not in self.map: |
191 raise KeyError(file) | |
192 index = self.map[file] | |
193 self.entries[index] = (file, offset, data) | |
194 self.file.write("%s\0%d\n" % (file, offset)) | |
195 self.file.flush() | |
196 | |
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197 @active |
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198 def nest(self): |
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199 self.count += 1 |
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200 self.usages += 1 |
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201 return self |
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202 |
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203 def release(self): |
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204 if self.count > 0: |
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205 self.usages -= 1 |
11685 | 206 # if the transaction scopes are left without being closed, fail |
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207 if self.count > 0 and self.usages == 0: |
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208 self._abort() |
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209 |
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210 def running(self): |
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211 return self.count > 0 |
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212 |
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213 @active |
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214 def close(self): |
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215 '''commit the transaction''' |
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216 if self.count == 1 and self.onclose is not None: |
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217 self.onclose() |
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218 |
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219 self.count -= 1 |
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220 if self.count != 0: |
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221 return |
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222 self.file.close() |
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223 self.backupsfile.close() |
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224 self.entries = [] |
95 | 225 if self.after: |
785 | 226 self.after() |
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227 if self.opener.isfile(self.journal): |
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228 self.opener.unlink(self.journal) |
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229 if self.opener.isfile(self.backupjournal): |
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230 self.opener.unlink(self.backupjournal) |
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231 for f, b, _ in self.backupentries: |
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232 self.opener.unlink(b) |
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233 self.backupentries = [] |
573 | 234 self.journal = None |
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235 |
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236 @active |
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237 def abort(self): |
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238 '''abort the transaction (generally called on error, or when the |
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239 transaction is not explicitly committed before going out of |
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240 scope)''' |
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241 self._abort() |
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242 |
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243 def _abort(self): |
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244 self.count = 0 |
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245 self.usages = 0 |
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246 self.file.close() |
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247 self.backupsfile.close() |
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248 |
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249 if self.onabort is not None: |
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250 self.onabort() |
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251 |
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252 try: |
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253 if not self.entries and not self.backupentries: |
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254 if self.journal: |
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255 self.opener.unlink(self.journal) |
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256 if self.backupjournal: |
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257 self.opener.unlink(self.backupjournal) |
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258 return |
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259 |
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260 self.report(_("transaction abort!\n")) |
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261 |
108 | 262 try: |
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263 _playback(self.journal, self.report, self.opener, |
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264 self.entries, self.backupentries, False) |
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265 self.report(_("rollback completed\n")) |
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266 except Exception: |
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267 self.report(_("rollback failed - please run hg recover\n")) |
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268 finally: |
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269 self.journal = None |
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270 |
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271 |
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272 def rollback(opener, file, report): |
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273 """Rolls back the transaction contained in the given file |
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274 |
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275 Reads the entries in the specified file, and the corresponding |
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276 '*.backupfiles' file, to recover from an incomplete transaction. |
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277 |
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278 * `file`: a file containing a list of entries, specifying where |
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279 to truncate each file. The file should contain a list of |
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280 file\0offset pairs, delimited by newlines. The corresponding |
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281 '*.backupfiles' file should contain a list of file\0backupfile |
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282 pairs, delimited by \0. |
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283 """ |
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284 entries = [] |
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285 backupentries = [] |
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286 |
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287 fp = opener.open(file) |
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288 lines = fp.readlines() |
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289 fp.close() |
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290 for l in lines: |
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291 try: |
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292 f, o = l.split('\0') |
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293 entries.append((f, int(o), None)) |
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294 except ValueError: |
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295 report(_("couldn't read journal entry %r!\n") % l) |
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296 |
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297 backupjournal = "%s.backupfiles" % file |
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298 if opener.exists(backupjournal): |
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299 fp = opener.open(backupjournal) |
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300 data = fp.read() |
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301 if len(data) > 0: |
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302 parts = data.split('\0') |
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303 for i in xrange(0, len(parts), 2): |
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304 f, b = parts[i:i + 1] |
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305 backupentries.append((f, b, None)) |
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306 |
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307 _playback(file, report, opener, entries, backupentries) |