annotate mercurial/transaction.py @ 3420:52617d992eed

Report branch for hg log and friends
author Matt Mackall <mpm@selenic.com>
date Tue, 17 Oct 2006 18:30:18 -0500
parents 345bac2bc4ec
children
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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 #
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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
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12 # of the GNU General Public License, incorporated herein by reference.
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13
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14 from demandload import demandload
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15 from i18n import gettext as _
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16 demandload(globals(), 'os')
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17
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18 class transaction(object):
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19 def __init__(self, report, opener, journal, after=None):
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20 self.journal = None
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21
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22 # abort here if the journal already exists
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23 if os.path.exists(journal):
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24 raise AssertionError(_("journal already exists - run hg recover"))
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26 self.count = 1
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27 self.report = report
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28 self.opener = opener
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29 self.after = after
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30 self.entries = []
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31 self.map = {}
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32 self.journal = journal
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33
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34 self.file = open(self.journal, "w")
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36 def __del__(self):
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37 if self.journal:
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38 if self.entries: self.abort()
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39 self.file.close()
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40 try: os.unlink(self.journal)
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41 except: pass
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43 def add(self, file, offset, data=None):
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44 if file in self.map: return
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45 self.entries.append((file, offset, data))
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46 self.map[file] = len(self.entries) - 1
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47 # add enough data to the journal to do the truncate
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48 self.file.write("%s\0%d\n" % (file, offset))
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49 self.file.flush()
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50
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51 def find(self, file):
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52 if file in self.map:
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53 return self.entries[self.map[file]]
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54 return None
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55
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56 def replace(self, file, offset, data=None):
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57 if file not in self.map:
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58 raise KeyError(file)
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59 index = self.map[file]
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60 self.entries[index] = (file, offset, data)
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61 self.file.write("%s\0%d\n" % (file, offset))
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62 self.file.flush()
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63
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64 def nest(self):
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65 self.count += 1
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66 return self
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67
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68 def running(self):
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69 return self.count > 0
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70
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71 def close(self):
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72 self.count -= 1
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73 if self.count != 0:
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74 return
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75 self.file.close()
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76 self.entries = []
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77 if self.after:
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78 self.after()
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79 else:
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80 os.unlink(self.journal)
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81 self.journal = None
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83 def abort(self):
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84 if not self.entries: return
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85
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86 self.report(_("transaction abort!\n"))
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87
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88 for f, o, ignore in self.entries:
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89 try:
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90 self.opener(f, "a").truncate(o)
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91 except:
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92 self.report(_("failed to truncate %s\n") % f)
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94 self.entries = []
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95
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96 self.report(_("rollback completed\n"))
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97
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98 def rollback(opener, file):
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99 files = {}
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100 for l in open(file).readlines():
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101 f, o = l.split('\0')
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102 files[f] = o
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103 for f in files:
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104 o = files[f]
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105 opener(f, "a").truncate(int(o))
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106 os.unlink(file)
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