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annotate mercurial/transaction.py @ 25812:68822b7cdd01
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author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Wed, 11 Jul 2012 20:48:51 -0400 |
parents | 328739ea70c3 |
children | 89049011f304 |
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 version = 2 |
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19 |
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20 def active(func): |
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21 def _active(self, *args, **kwds): |
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22 if self.count == 0: |
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23 raise error.Abort(_( |
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24 'cannot use transaction when it is already committed/aborted')) |
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25 return func(self, *args, **kwds) |
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26 return _active |
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27 |
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28 def _playback(journal, report, opener, vfsmap, entries, backupentries, |
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29 unlink=True): |
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30 for f, o, _ignore in entries: |
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31 if o or not unlink: |
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32 try: |
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33 fp = opener(f, 'a') |
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34 fp.truncate(o) |
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35 fp.close() |
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36 except IOError: |
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37 report(_("failed to truncate %s\n") % f) |
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38 raise |
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39 else: |
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40 try: |
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41 opener.unlink(f) |
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42 except (IOError, OSError) as inst: |
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43 if inst.errno != errno.ENOENT: |
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44 raise |
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45 |
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46 backupfiles = [] |
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47 for l, f, b, c in backupentries: |
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48 if l not in vfsmap and c: |
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49 report("couldn't handle %s: unknown cache location %s\n" |
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50 % (b, l)) |
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51 vfs = vfsmap[l] |
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52 try: |
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53 if f and b: |
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54 filepath = vfs.join(f) |
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55 backuppath = vfs.join(b) |
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56 try: |
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57 util.copyfile(backuppath, filepath) |
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58 backupfiles.append(b) |
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59 except IOError: |
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60 report(_("failed to recover %s\n") % f) |
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61 else: |
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62 target = f or b |
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63 try: |
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64 vfs.unlink(target) |
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65 except (IOError, OSError) as inst: |
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66 if inst.errno != errno.ENOENT: |
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67 raise |
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68 except (IOError, OSError, util.Abort) as inst: |
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69 if not c: |
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70 raise |
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71 |
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72 opener.unlink(journal) |
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73 backuppath = "%s.backupfiles" % journal |
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74 if opener.exists(backuppath): |
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75 opener.unlink(backuppath) |
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76 try: |
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77 for f in backupfiles: |
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78 if opener.exists(f): |
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79 opener.unlink(f) |
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80 except (IOError, OSError, util.Abort) as inst: |
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81 # only pure backup file remains, it is sage to ignore any error |
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82 pass |
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83 |
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84 class transaction(object): |
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85 def __init__(self, report, opener, vfsmap, journalname, undoname=None, |
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86 after=None, createmode=None, validator=None): |
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87 """Begin a new transaction |
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88 |
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89 Begins a new transaction that allows rolling back writes in the event of |
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90 an exception. |
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91 |
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92 * `after`: called after the transaction has been committed |
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93 * `createmode`: the mode of the journal file that will be created |
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94 """ |
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95 self.count = 1 |
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96 self.usages = 1 |
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98 # a vfs to the store content |
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99 self.opener = opener |
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100 # a map to access file in various {location -> vfs} |
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101 vfsmap = vfsmap.copy() |
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102 vfsmap[''] = opener # set default value |
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103 self._vfsmap = vfsmap |
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105 self.entries = [] |
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106 self.map = {} |
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107 self.journal = journalname |
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108 self.undoname = undoname |
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109 self._queue = [] |
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110 # A callback to validate transaction content before closing it. |
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111 # should raise exception is anything is wrong. |
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112 # target user is repository hooks. |
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113 if validator is None: |
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114 validator = lambda tr: None |
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115 self.validator = validator |
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116 # a dict of arguments to be passed to hooks |
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117 self.hookargs = {} |
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118 self.file = opener.open(self.journal, "w") |
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119 |
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120 # a list of ('location', 'path', 'backuppath', cache) entries. |
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121 # - if 'backuppath' is empty, no file existed at backup time |
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122 # - if 'path' is empty, this is a temporary transaction file |
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123 # - if 'location' is not empty, the path is outside main opener reach. |
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124 # use 'location' value as a key in a vfsmap to find the right 'vfs' |
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125 # (cache is currently unused) |
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126 self._backupentries = [] |
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127 self._backupmap = {} |
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128 self._backupjournal = "%s.backupfiles" % self.journal |
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129 self._backupsfile = opener.open(self._backupjournal, 'w') |
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130 self._backupsfile.write('%d\n' % version) |
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131 |
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132 if createmode is not None: |
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133 opener.chmod(self.journal, createmode & 0o666) |
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134 opener.chmod(self._backupjournal, createmode & 0o666) |
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135 |
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136 # hold file generations to be performed on commit |
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137 self._filegenerators = {} |
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138 # hold callback to write pending data for hooks |
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139 self._pendingcallback = {} |
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140 # True is any pending data have been written ever |
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141 self._anypending = False |
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142 # holds callback to call when writing the transaction |
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143 self._finalizecallback = {} |
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144 # hold callback for post transaction close |
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145 self._postclosecallback = {} |
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146 # holds callbacks to call during abort |
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147 self._abortcallback = {} |
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148 |
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149 def __del__(self): |
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150 if self.journal: |
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151 self._abort() |
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152 |
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153 @active |
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154 def startgroup(self): |
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155 """delay registration of file entry |
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156 |
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157 This is used by strip to delay vision of strip offset. The transaction |
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158 sees either none or all of the strip actions to be done.""" |
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159 self._queue.append([]) |
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160 |
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161 @active |
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162 def endgroup(self): |
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163 """apply delayed registration of file entry. |
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164 |
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165 This is used by strip to delay vision of strip offset. The transaction |
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166 sees either none or all of the strip actions to be done.""" |
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167 q = self._queue.pop() |
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168 for f, o, data in q: |
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169 self._addentry(f, o, data) |
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170 |
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171 @active |
2084 | 172 def add(self, file, offset, data=None): |
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173 """record the state of an append-only file before update""" |
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174 if file in self.map or file in self._backupmap: |
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175 return |
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176 if self._queue: |
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177 self._queue[-1].append((file, offset, data)) |
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178 return |
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179 |
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180 self._addentry(file, offset, data) |
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181 |
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182 def _addentry(self, file, offset, data): |
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183 """add a append-only entry to memory and on-disk state""" |
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184 if file in self.map or file in self._backupmap: |
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185 return |
2084 | 186 self.entries.append((file, offset, data)) |
187 self.map[file] = len(self.entries) - 1 | |
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188 # add enough data to the journal to do the truncate |
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189 self.file.write("%s\0%d\n" % (file, offset)) |
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190 self.file.flush() |
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191 |
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192 @active |
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193 def addbackup(self, file, hardlink=True, location=''): |
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194 """Adds a backup of the file to the transaction |
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195 |
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196 Calling addbackup() creates a hardlink backup of the specified file |
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197 that is used to recover the file in the event of the transaction |
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198 aborting. |
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199 |
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200 * `file`: the file path, relative to .hg/store |
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201 * `hardlink`: use a hardlink to quickly create the backup |
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202 """ |
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203 if self._queue: |
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204 msg = 'cannot use transaction.addbackup inside "group"' |
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205 raise RuntimeError(msg) |
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206 |
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207 if file in self.map or file in self._backupmap: |
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208 return |
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209 vfs = self._vfsmap[location] |
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210 dirname, filename = vfs.split(file) |
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211 backupfilename = "%s.backup.%s" % (self.journal, filename) |
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212 backupfile = vfs.reljoin(dirname, backupfilename) |
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213 if vfs.exists(file): |
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214 filepath = vfs.join(file) |
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215 backuppath = vfs.join(backupfile) |
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216 util.copyfile(filepath, backuppath, hardlink=hardlink) |
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217 else: |
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218 backupfile = '' |
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219 |
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220 self._addbackupentry((location, file, backupfile, False)) |
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221 |
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222 def _addbackupentry(self, entry): |
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223 """register a new backup entry and write it to disk""" |
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224 self._backupentries.append(entry) |
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225 self._backupmap[entry[1]] = len(self._backupentries) - 1 |
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226 self._backupsfile.write("%s\0%s\0%s\0%d\n" % entry) |
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227 self._backupsfile.flush() |
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228 |
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229 @active |
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230 def registertmp(self, tmpfile, location=''): |
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231 """register a temporary transaction file |
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232 |
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233 Such files will be deleted when the transaction exits (on both |
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234 failure and success). |
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235 """ |
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236 self._addbackupentry((location, '', tmpfile, False)) |
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237 |
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238 @active |
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239 def addfilegenerator(self, genid, filenames, genfunc, order=0, |
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240 location=''): |
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241 """add a function to generates some files at transaction commit |
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242 |
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243 The `genfunc` argument is a function capable of generating proper |
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244 content of each entry in the `filename` tuple. |
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245 |
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246 At transaction close time, `genfunc` will be called with one file |
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247 object argument per entries in `filenames`. |
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248 |
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249 The transaction itself is responsible for the backup, creation and |
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250 final write of such file. |
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251 |
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252 The `genid` argument is used to ensure the same set of file is only |
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253 generated once. Call to `addfilegenerator` for a `genid` already |
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254 present will overwrite the old entry. |
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255 |
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256 The `order` argument may be used to control the order in which multiple |
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257 generator will be executed. |
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258 |
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259 The `location` arguments may be used to indicate the files are located |
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260 outside of the the standard directory for transaction. It should match |
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261 one of the key of the `transaction.vfsmap` dictionary. |
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262 """ |
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263 # For now, we are unable to do proper backup and restore of custom vfs |
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264 # but for bookmarks that are handled outside this mechanism. |
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265 self._filegenerators[genid] = (order, filenames, genfunc, location) |
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266 |
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267 def _generatefiles(self, suffix=''): |
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268 # write files registered for generation |
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269 any = False |
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270 for entry in sorted(self._filegenerators.values()): |
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271 any = True |
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272 order, filenames, genfunc, location = entry |
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273 vfs = self._vfsmap[location] |
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274 files = [] |
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275 try: |
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276 for name in filenames: |
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277 name += suffix |
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278 if suffix: |
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279 self.registertmp(name, location=location) |
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280 else: |
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281 self.addbackup(name, location=location) |
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282 files.append(vfs(name, 'w', atomictemp=True)) |
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283 genfunc(*files) |
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284 finally: |
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285 for f in files: |
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286 f.close() |
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287 return any |
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288 |
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289 @active |
2084 | 290 def find(self, file): |
291 if file in self.map: | |
292 return self.entries[self.map[file]] | |
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293 if file in self._backupmap: |
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294 return self._backupentries[self._backupmap[file]] |
2084 | 295 return None |
296 | |
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297 @active |
2084 | 298 def replace(self, file, offset, data=None): |
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299 ''' |
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300 replace can only replace already committed entries |
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301 that are not pending in the queue |
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302 ''' |
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303 |
2084 | 304 if file not in self.map: |
305 raise KeyError(file) | |
306 index = self.map[file] | |
307 self.entries[index] = (file, offset, data) | |
308 self.file.write("%s\0%d\n" % (file, offset)) | |
309 self.file.flush() | |
310 | |
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311 @active |
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312 def nest(self): |
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313 self.count += 1 |
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314 self.usages += 1 |
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315 return self |
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316 |
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317 def release(self): |
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318 if self.count > 0: |
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319 self.usages -= 1 |
11685 | 320 # if the transaction scopes are left without being closed, fail |
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321 if self.count > 0 and self.usages == 0: |
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322 self._abort() |
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323 |
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324 def running(self): |
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325 return self.count > 0 |
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326 |
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327 def addpending(self, category, callback): |
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328 """add a callback to be called when the transaction is pending |
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329 |
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330 The transaction will be given as callback's first argument. |
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331 |
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332 Category is a unique identifier to allow overwriting an old callback |
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333 with a newer callback. |
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334 """ |
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335 self._pendingcallback[category] = callback |
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336 |
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337 @active |
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338 def writepending(self): |
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339 '''write pending file to temporary version |
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340 |
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341 This is used to allow hooks to view a transaction before commit''' |
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342 categories = sorted(self._pendingcallback) |
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343 for cat in categories: |
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344 # remove callback since the data will have been flushed |
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345 any = self._pendingcallback.pop(cat)(self) |
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346 self._anypending = self._anypending or any |
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347 self._anypending |= self._generatefiles(suffix='.pending') |
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348 return self._anypending |
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349 |
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350 @active |
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351 def addfinalize(self, category, callback): |
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352 """add a callback to be called when the transaction is closed |
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353 |
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354 The transaction will be given as callback's first argument. |
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355 |
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356 Category is a unique identifier to allow overwriting old callbacks with |
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357 newer callbacks. |
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358 """ |
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359 self._finalizecallback[category] = callback |
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360 |
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361 @active |
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362 def addpostclose(self, category, callback): |
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363 """add a callback to be called after the transaction is closed |
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364 |
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365 The transaction will be given as callback's first argument. |
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366 |
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367 Category is a unique identifier to allow overwriting an old callback |
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368 with a newer callback. |
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369 """ |
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370 self._postclosecallback[category] = callback |
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371 |
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372 @active |
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373 def addabort(self, category, callback): |
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374 """add a callback to be called when the transaction is aborted. |
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375 |
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376 The transaction will be given as the first argument to the callback. |
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377 |
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378 Category is a unique identifier to allow overwriting an old callback |
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379 with a newer callback. |
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380 """ |
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381 self._abortcallback[category] = callback |
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382 |
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383 @active |
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384 def close(self): |
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385 '''commit the transaction''' |
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386 if self.count == 1: |
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387 self.validator(self) # will raise exception if needed |
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388 self._generatefiles() |
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389 categories = sorted(self._finalizecallback) |
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390 for cat in categories: |
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391 self._finalizecallback[cat](self) |
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392 |
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393 self.count -= 1 |
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394 if self.count != 0: |
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395 return |
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396 self.file.close() |
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397 self._backupsfile.close() |
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398 # cleanup temporary files |
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399 for l, f, b, c in self._backupentries: |
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400 if l not in self._vfsmap and c: |
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401 self.report("couldn't remote %s: unknown cache location %s\n" |
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402 % (b, l)) |
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403 continue |
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404 vfs = self._vfsmap[l] |
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405 if not f and b and vfs.exists(b): |
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406 try: |
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407 vfs.unlink(b) |
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408 except (IOError, OSError, util.Abort) as inst: |
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409 if not c: |
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410 raise |
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411 # Abort may be raise by read only opener |
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412 self.report("couldn't remote %s: %s\n" |
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413 % (vfs.join(b), inst)) |
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414 self.entries = [] |
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415 self._writeundo() |
95 | 416 if self.after: |
785 | 417 self.after() |
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418 if self.opener.isfile(self.journal): |
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419 self.opener.unlink(self.journal) |
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420 if self.opener.isfile(self._backupjournal): |
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421 self.opener.unlink(self._backupjournal) |
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422 for l, _f, b, c in self._backupentries: |
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423 if l not in self._vfsmap and c: |
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424 self.report("couldn't remote %s: unknown cache location" |
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425 "%s\n" % (b, l)) |
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426 continue |
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427 vfs = self._vfsmap[l] |
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428 if b and vfs.exists(b): |
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429 try: |
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430 vfs.unlink(b) |
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431 except (IOError, OSError, util.Abort) as inst: |
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432 if not c: |
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433 raise |
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434 # Abort may be raise by read only opener |
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435 self.report("couldn't remote %s: %s\n" |
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436 % (vfs.join(b), inst)) |
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437 self._backupentries = [] |
573 | 438 self.journal = None |
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439 # run post close action |
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440 categories = sorted(self._postclosecallback) |
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441 for cat in categories: |
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442 self._postclosecallback[cat](self) |
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443 |
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444 @active |
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445 def abort(self): |
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446 '''abort the transaction (generally called on error, or when the |
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447 transaction is not explicitly committed before going out of |
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448 scope)''' |
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449 self._abort() |
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450 |
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451 def _writeundo(self): |
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452 """write transaction data for possible future undo call""" |
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453 if self.undoname is None: |
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454 return |
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455 undobackupfile = self.opener.open("%s.backupfiles" % self.undoname, 'w') |
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456 undobackupfile.write('%d\n' % version) |
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457 for l, f, b, c in self._backupentries: |
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458 if not f: # temporary file |
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459 continue |
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460 if not b: |
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461 u = '' |
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462 else: |
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463 if l not in self._vfsmap and c: |
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464 self.report("couldn't remote %s: unknown cache location" |
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465 "%s\n" % (b, l)) |
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466 continue |
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467 vfs = self._vfsmap[l] |
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468 base, name = vfs.split(b) |
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469 assert name.startswith(self.journal), name |
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470 uname = name.replace(self.journal, self.undoname, 1) |
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471 u = vfs.reljoin(base, uname) |
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472 util.copyfile(vfs.join(b), vfs.join(u), hardlink=True) |
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473 undobackupfile.write("%s\0%s\0%s\0%d\n" % (l, f, u, c)) |
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474 undobackupfile.close() |
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475 |
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476 |
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477 def _abort(self): |
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478 self.count = 0 |
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479 self.usages = 0 |
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480 self.file.close() |
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481 self._backupsfile.close() |
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482 |
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483 try: |
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484 if not self.entries and not self._backupentries: |
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485 if self.journal: |
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486 self.opener.unlink(self.journal) |
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487 if self._backupjournal: |
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488 self.opener.unlink(self._backupjournal) |
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489 return |
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490 |
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491 self.report(_("transaction abort!\n")) |
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492 |
108 | 493 try: |
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494 for cat in sorted(self._abortcallback): |
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495 self._abortcallback[cat](self) |
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496 _playback(self.journal, self.report, self.opener, self._vfsmap, |
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497 self.entries, self._backupentries, False) |
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498 self.report(_("rollback completed\n")) |
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499 except BaseException: |
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500 self.report(_("rollback failed - please run hg recover\n")) |
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501 finally: |
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502 self.journal = None |
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503 |
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504 |
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505 def rollback(opener, vfsmap, file, report): |
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506 """Rolls back the transaction contained in the given file |
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507 |
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508 Reads the entries in the specified file, and the corresponding |
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509 '*.backupfiles' file, to recover from an incomplete transaction. |
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510 |
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511 * `file`: a file containing a list of entries, specifying where |
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512 to truncate each file. The file should contain a list of |
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513 file\0offset pairs, delimited by newlines. The corresponding |
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514 '*.backupfiles' file should contain a list of file\0backupfile |
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515 pairs, delimited by \0. |
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516 """ |
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517 entries = [] |
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518 backupentries = [] |
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519 |
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520 fp = opener.open(file) |
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521 lines = fp.readlines() |
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522 fp.close() |
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523 for l in lines: |
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524 try: |
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525 f, o = l.split('\0') |
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526 entries.append((f, int(o), None)) |
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527 except ValueError: |
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528 report(_("couldn't read journal entry %r!\n") % l) |
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529 |
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530 backupjournal = "%s.backupfiles" % file |
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531 if opener.exists(backupjournal): |
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532 fp = opener.open(backupjournal) |
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533 lines = fp.readlines() |
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534 if lines: |
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535 ver = lines[0][:-1] |
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536 if ver == str(version): |
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537 for line in lines[1:]: |
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538 if line: |
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539 # Shave off the trailing newline |
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540 line = line[:-1] |
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541 l, f, b, c = line.split('\0') |
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542 backupentries.append((l, f, b, bool(c))) |
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543 else: |
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544 report(_("journal was created by a different version of " |
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545 "Mercurial\n")) |
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546 |
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547 _playback(file, report, opener, vfsmap, entries, backupentries) |