Mercurial > hg
annotate mercurial/transaction.py @ 16719:e7bf09acd410
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For the PyPy repo with 744 branches and 843 branch heads, this brings
hg log -r default over NFS from:
CallCount Recursive Total(ms) Inline(ms) module:lineno(function)
3249 0 1.3222 1.3222 <open>
3244 0 0.6211 0.6211 <method 'close' of 'file' objects>
3243 0 0.0800 0.0800 <method 'read' of 'file' objects>
3241 0 0.0660 0.0660 <method 'seek' of 'file' objects>
3905 0 0.0476 0.0476 <zlib.decompress>
3281 0 2.6756 0.0472 mercurial.changelog:182(read)
+3281 0 2.5256 0.0453 +mercurial.revlog:881(revision)
+3276 0 0.0389 0.0196 +mercurial.changelog:28(decodeextra)
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3241 0 2.2464 0.0456 mercurial.revlog:818(_loadchunk)
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+3241 0 0.0765 0.0765 +<method 'read' of 'file' objects>
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+3241 0 1.4209 0.0135 +mercurial.store:374(__call__)
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3281 0 2.5256 0.0453 mercurial.revlog:881(revision)
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13682 0 0.0479 0.0248 <method 'decode' of 'str' objects>
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+1 0 0.0003 0.0000 +encodings:71(search_function)
3248 0 1.3995 0.0246 mercurial.scmutil:218(__call__)
+3248 0 1.3222 1.3222 +<open>
+3248 0 0.0235 0.0184 +os.path:80(split)
+3248 0 0.0084 0.0068 +mercurial.scmutil:92(__call__)
Time: real 2.750 secs (user 0.680+0.000 sys 0.360+0.000)
down to:
CallCount Recursive Total(ms) Inline(ms) module:lineno(function)
55 31 0.0197 0.0163 <__import__>
+1 0 0.0006 0.0002 +mercurial.context:8(<module>)
+1 0 0.0042 0.0001 +mercurial.revlog:12(<module>)
+1 0 0.0002 0.0001 +mercurial.match:8(<module>)
+1 0 0.0003 0.0001 +mercurial.dirstate:7(<module>)
+1 0 0.0057 0.0001 +mercurial.changelog:8(<module>)
1 0 0.0117 0.0032 mercurial.localrepo:525(_readbranchcache)
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+843 0 0.0004 0.0004 +<method 'setdefault' of 'dict' objects>
+1 0 0.0003 0.0003 +<method 'close' of 'file' objects>
3 0 0.0029 0.0029 <method 'read' of 'file' objects>
9 0 0.0018 0.0018 <open>
990 0 0.0017 0.0017 <binascii.unhexlify>
53 0 0.0016 0.0016 mercurial.demandimport:43(__init__)
862 0 0.0015 0.0015 <_codecs.utf_8_decode>
862 0 0.0037 0.0014 <method 'decode' of 'str' objects>
+862 0 0.0023 0.0008 +encodings.utf_8:15(decode)
981 0 0.0011 0.0011 <method 'split' of 'str' objects>
861 0 0.0046 0.0009 mercurial.encoding:61(tolocal)
+861 0 0.0037 0.0014 +<method 'decode' of 'str' objects>
862 0 0.0023 0.0008 encodings.utf_8:15(decode)
+862 0 0.0015 0.0015 +<_codecs.utf_8_decode>
4 0 0.0008 0.0008 <method 'close' of 'file' objects>
179 154 0.0202 0.0004 mercurial.demandimport:83(__getattribute__)
+36 11 0.0199 0.0003 +mercurial.demandimport:55(_load)
+72 0 0.0001 0.0001 +mercurial.demandimport:83(__getattribute__)
+36 0 0.0000 0.0000 +<getattr>
1 0 0.0015 0.0004 mercurial.tags:148(_readtagcache)
Time: real 0.060 secs (user 0.030+0.000 sys 0.010+0.000)
author | Brodie Rao <brodie@sf.io> |
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date | Sun, 13 May 2012 14:04:04 +0200 |
parents | f366d4c2ff34 |
children | e7cfe3587ea4 |
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1 # transaction.py - simple journalling 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 |
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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: |
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139 if os.path.isfile(self.journal): |
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140 util.unlink(self.journal) |
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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) |