Mercurial > hg
annotate mercurial/transaction.py @ 37056:861e9d37e56e
wireproto: buffer output frames when in half duplex mode
Previously, when told that a response was ready, the server reactor
would instruct the caller to send frames immediately. This was OK
as an initial implementation. But it would not work for half-duplex
connections where the sender can't receive until all data has been
transmitted - such as httplib based clients.
In this commit, we teach the reactor that output frames should
be buffered until end of input is seen. This required a new
event to inform the reactor of end of input. The result from that
event will instruct the consumer to send all buffered frames.
The HTTP server is buffered by default.
This change effectively hides the complexity of buffering within
the reactor so that transports need not be concerned about it.
This helps keep the transports "dumb" and will make implementing
multiple requests-responses per atomic exchange (like an HTTP
request) much simpler.
Differential Revision: https://phab.mercurial-scm.org/D2860
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Wed, 14 Mar 2018 14:01:16 -0700 |
parents | aff5996f3043 |
children | 3e8952c0cb45 |
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 |
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14 from __future__ import absolute_import |
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15 |
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16 import errno |
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17 |
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18 from .i18n import _ |
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19 from . import ( |
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20 error, |
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21 pycompat, |
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22 util, |
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23 ) |
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24 |
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25 version = 2 |
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26 |
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27 # These are the file generators that should only be executed after the |
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28 # finalizers are done, since they rely on the output of the finalizers (like |
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29 # the changelog having been written). |
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30 postfinalizegenerators = { |
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31 'bookmarks', |
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32 'dirstate' |
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33 } |
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34 |
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35 gengroupall='all' |
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36 gengroupprefinalize='prefinalize' |
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37 gengrouppostfinalize='postfinalize' |
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38 |
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39 def active(func): |
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40 def _active(self, *args, **kwds): |
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41 if self.count == 0: |
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42 raise error.Abort(_( |
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43 'cannot use transaction when it is already committed/aborted')) |
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44 return func(self, *args, **kwds) |
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45 return _active |
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46 |
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47 def _playback(journal, report, opener, vfsmap, entries, backupentries, |
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48 unlink=True, checkambigfiles=None): |
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49 for f, o, _ignore in entries: |
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50 if o or not unlink: |
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51 checkambig = checkambigfiles and (f, '') in checkambigfiles |
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52 try: |
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53 fp = opener(f, 'a', checkambig=checkambig) |
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54 fp.truncate(o) |
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55 fp.close() |
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56 except IOError: |
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57 report(_("failed to truncate %s\n") % f) |
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58 raise |
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59 else: |
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60 try: |
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61 opener.unlink(f) |
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62 except (IOError, OSError) as inst: |
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63 if inst.errno != errno.ENOENT: |
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64 raise |
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65 |
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66 backupfiles = [] |
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67 for l, f, b, c in backupentries: |
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68 if l not in vfsmap and c: |
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69 report("couldn't handle %s: unknown cache location %s\n" |
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70 % (b, l)) |
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71 vfs = vfsmap[l] |
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72 try: |
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73 if f and b: |
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74 filepath = vfs.join(f) |
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75 backuppath = vfs.join(b) |
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76 checkambig = checkambigfiles and (f, l) in checkambigfiles |
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77 try: |
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78 util.copyfile(backuppath, filepath, checkambig=checkambig) |
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79 backupfiles.append(b) |
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80 except IOError: |
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81 report(_("failed to recover %s\n") % f) |
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82 else: |
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83 target = f or b |
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84 try: |
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85 vfs.unlink(target) |
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86 except (IOError, OSError) as inst: |
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87 if inst.errno != errno.ENOENT: |
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88 raise |
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89 except (IOError, OSError, error.Abort) as inst: |
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90 if not c: |
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91 raise |
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92 |
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93 backuppath = "%s.backupfiles" % journal |
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94 if opener.exists(backuppath): |
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95 opener.unlink(backuppath) |
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96 opener.unlink(journal) |
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97 try: |
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98 for f in backupfiles: |
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99 if opener.exists(f): |
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100 opener.unlink(f) |
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101 except (IOError, OSError, error.Abort) as inst: |
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102 # only pure backup file remains, it is sage to ignore any error |
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103 pass |
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104 |
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105 class transaction(util.transactional): |
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106 def __init__(self, report, opener, vfsmap, journalname, undoname=None, |
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107 after=None, createmode=None, validator=None, releasefn=None, |
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108 checkambigfiles=None, name=r'<unnamed>'): |
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109 """Begin a new transaction |
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110 |
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111 Begins a new transaction that allows rolling back writes in the event of |
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112 an exception. |
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113 |
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114 * `after`: called after the transaction has been committed |
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115 * `createmode`: the mode of the journal file that will be created |
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116 * `releasefn`: called after releasing (with transaction and result) |
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117 |
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118 `checkambigfiles` is a set of (path, vfs-location) tuples, |
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119 which determine whether file stat ambiguity should be avoided |
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120 for corresponded files. |
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121 """ |
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122 self.count = 1 |
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123 self.usages = 1 |
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125 # a vfs to the store content |
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126 self.opener = opener |
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127 # a map to access file in various {location -> vfs} |
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128 vfsmap = vfsmap.copy() |
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129 vfsmap[''] = opener # set default value |
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130 self._vfsmap = vfsmap |
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132 self.entries = [] |
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133 self.map = {} |
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134 self.journal = journalname |
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135 self.undoname = undoname |
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136 self._queue = [] |
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137 # A callback to validate transaction content before closing it. |
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138 # should raise exception is anything is wrong. |
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139 # target user is repository hooks. |
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140 if validator is None: |
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141 validator = lambda tr: None |
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142 self.validator = validator |
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143 # A callback to do something just after releasing transaction. |
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144 if releasefn is None: |
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145 releasefn = lambda tr, success: None |
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146 self.releasefn = releasefn |
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147 |
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148 self.checkambigfiles = set() |
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149 if checkambigfiles: |
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150 self.checkambigfiles.update(checkambigfiles) |
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151 |
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152 self.names = [name] |
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153 |
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154 # A dict dedicated to precisely tracking the changes introduced in the |
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155 # transaction. |
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156 self.changes = {} |
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157 |
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158 # a dict of arguments to be passed to hooks |
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159 self.hookargs = {} |
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160 self.file = opener.open(self.journal, "w") |
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161 |
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162 # a list of ('location', 'path', 'backuppath', cache) entries. |
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163 # - if 'backuppath' is empty, no file existed at backup time |
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164 # - if 'path' is empty, this is a temporary transaction file |
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165 # - if 'location' is not empty, the path is outside main opener reach. |
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166 # use 'location' value as a key in a vfsmap to find the right 'vfs' |
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167 # (cache is currently unused) |
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168 self._backupentries = [] |
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169 self._backupmap = {} |
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170 self._backupjournal = "%s.backupfiles" % self.journal |
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171 self._backupsfile = opener.open(self._backupjournal, 'w') |
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172 self._backupsfile.write('%d\n' % version) |
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173 |
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174 if createmode is not None: |
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175 opener.chmod(self.journal, createmode & 0o666) |
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176 opener.chmod(self._backupjournal, createmode & 0o666) |
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177 |
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178 # hold file generations to be performed on commit |
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179 self._filegenerators = {} |
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180 # hold callback to write pending data for hooks |
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181 self._pendingcallback = {} |
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182 # True is any pending data have been written ever |
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183 self._anypending = False |
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184 # holds callback to call when writing the transaction |
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185 self._finalizecallback = {} |
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186 # hold callback for post transaction close |
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187 self._postclosecallback = {} |
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188 # holds callbacks to call during abort |
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189 self._abortcallback = {} |
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190 |
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191 def __repr__(self): |
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192 name = r'/'.join(self.names) |
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193 return (r'<transaction name=%s, count=%d, usages=%d>' % |
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194 (name, self.count, self.usages)) |
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195 |
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196 def __del__(self): |
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197 if self.journal: |
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198 self._abort() |
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199 |
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200 @active |
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201 def startgroup(self): |
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202 """delay registration of file entry |
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203 |
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204 This is used by strip to delay vision of strip offset. The transaction |
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205 sees either none or all of the strip actions to be done.""" |
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206 self._queue.append([]) |
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207 |
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208 @active |
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209 def endgroup(self): |
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210 """apply delayed registration of file entry. |
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211 |
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212 This is used by strip to delay vision of strip offset. The transaction |
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213 sees either none or all of the strip actions to be done.""" |
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214 q = self._queue.pop() |
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215 for f, o, data in q: |
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216 self._addentry(f, o, data) |
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217 |
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218 @active |
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220 """record the state of an append-only file before update""" |
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221 if file in self.map or file in self._backupmap: |
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222 return |
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223 if self._queue: |
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224 self._queue[-1].append((file, offset, data)) |
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225 return |
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226 |
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227 self._addentry(file, offset, data) |
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228 |
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229 def _addentry(self, file, offset, data): |
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230 """add a append-only entry to memory and on-disk state""" |
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231 if file in self.map or file in self._backupmap: |
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232 return |
2084 | 233 self.entries.append((file, offset, data)) |
234 self.map[file] = len(self.entries) - 1 | |
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235 # add enough data to the journal to do the truncate |
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236 self.file.write("%s\0%d\n" % (file, offset)) |
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237 self.file.flush() |
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238 |
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239 @active |
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240 def addbackup(self, file, hardlink=True, location=''): |
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241 """Adds a backup of the file to the transaction |
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242 |
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243 Calling addbackup() creates a hardlink backup of the specified file |
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244 that is used to recover the file in the event of the transaction |
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245 aborting. |
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246 |
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247 * `file`: the file path, relative to .hg/store |
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248 * `hardlink`: use a hardlink to quickly create the backup |
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249 """ |
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250 if self._queue: |
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251 msg = 'cannot use transaction.addbackup inside "group"' |
31648 | 252 raise error.ProgrammingError(msg) |
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253 |
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254 if file in self.map or file in self._backupmap: |
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255 return |
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256 vfs = self._vfsmap[location] |
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257 dirname, filename = vfs.split(file) |
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258 backupfilename = "%s.backup.%s" % (self.journal, filename) |
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259 backupfile = vfs.reljoin(dirname, backupfilename) |
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260 if vfs.exists(file): |
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261 filepath = vfs.join(file) |
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262 backuppath = vfs.join(backupfile) |
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263 util.copyfile(filepath, backuppath, hardlink=hardlink) |
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264 else: |
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265 backupfile = '' |
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266 |
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267 self._addbackupentry((location, file, backupfile, False)) |
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268 |
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269 def _addbackupentry(self, entry): |
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270 """register a new backup entry and write it to disk""" |
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271 self._backupentries.append(entry) |
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272 self._backupmap[entry[1]] = len(self._backupentries) - 1 |
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273 self._backupsfile.write("%s\0%s\0%s\0%d\n" % entry) |
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274 self._backupsfile.flush() |
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275 |
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276 @active |
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277 def registertmp(self, tmpfile, location=''): |
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278 """register a temporary transaction file |
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279 |
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280 Such files will be deleted when the transaction exits (on both |
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281 failure and success). |
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282 """ |
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283 self._addbackupentry((location, '', tmpfile, False)) |
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284 |
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285 @active |
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286 def addfilegenerator(self, genid, filenames, genfunc, order=0, |
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287 location=''): |
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288 """add a function to generates some files at transaction commit |
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289 |
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290 The `genfunc` argument is a function capable of generating proper |
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291 content of each entry in the `filename` tuple. |
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292 |
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293 At transaction close time, `genfunc` will be called with one file |
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294 object argument per entries in `filenames`. |
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295 |
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296 The transaction itself is responsible for the backup, creation and |
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297 final write of such file. |
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298 |
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299 The `genid` argument is used to ensure the same set of file is only |
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300 generated once. Call to `addfilegenerator` for a `genid` already |
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301 present will overwrite the old entry. |
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302 |
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303 The `order` argument may be used to control the order in which multiple |
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304 generator will be executed. |
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305 |
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306 The `location` arguments may be used to indicate the files are located |
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307 outside of the the standard directory for transaction. It should match |
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308 one of the key of the `transaction.vfsmap` dictionary. |
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309 """ |
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310 # For now, we are unable to do proper backup and restore of custom vfs |
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311 # but for bookmarks that are handled outside this mechanism. |
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312 self._filegenerators[genid] = (order, filenames, genfunc, location) |
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313 |
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314 @active |
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315 def removefilegenerator(self, genid): |
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316 """reverse of addfilegenerator, remove a file generator function""" |
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317 if genid in self._filegenerators: |
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318 del self._filegenerators[genid] |
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319 |
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320 def _generatefiles(self, suffix='', group=gengroupall): |
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321 # write files registered for generation |
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322 any = False |
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323 for id, entry in sorted(self._filegenerators.iteritems()): |
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324 any = True |
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325 order, filenames, genfunc, location = entry |
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326 |
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327 # for generation at closing, check if it's before or after finalize |
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328 postfinalize = group == gengrouppostfinalize |
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329 if (group != gengroupall and |
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330 (id in postfinalizegenerators) != (postfinalize)): |
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331 continue |
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332 |
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333 vfs = self._vfsmap[location] |
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334 files = [] |
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335 try: |
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336 for name in filenames: |
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337 name += suffix |
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338 if suffix: |
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339 self.registertmp(name, location=location) |
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340 checkambig = False |
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341 else: |
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342 self.addbackup(name, location=location) |
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343 checkambig = (name, location) in self.checkambigfiles |
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344 files.append(vfs(name, 'w', atomictemp=True, |
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345 checkambig=checkambig)) |
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346 genfunc(*files) |
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347 finally: |
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348 for f in files: |
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349 f.close() |
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350 return any |
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351 |
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352 @active |
2084 | 353 def find(self, file): |
354 if file in self.map: | |
355 return self.entries[self.map[file]] | |
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356 if file in self._backupmap: |
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357 return self._backupentries[self._backupmap[file]] |
2084 | 358 return None |
359 | |
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360 @active |
2084 | 361 def replace(self, file, offset, data=None): |
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362 ''' |
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363 replace can only replace already committed entries |
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364 that are not pending in the queue |
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365 ''' |
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366 |
2084 | 367 if file not in self.map: |
368 raise KeyError(file) | |
369 index = self.map[file] | |
370 self.entries[index] = (file, offset, data) | |
371 self.file.write("%s\0%d\n" % (file, offset)) | |
372 self.file.flush() | |
373 | |
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374 @active |
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375 def nest(self, name=r'<unnamed>'): |
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376 self.count += 1 |
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377 self.usages += 1 |
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378 self.names.append(name) |
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379 return self |
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380 |
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381 def release(self): |
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382 if self.count > 0: |
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383 self.usages -= 1 |
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384 if self.names: |
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385 self.names.pop() |
11685 | 386 # if the transaction scopes are left without being closed, fail |
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387 if self.count > 0 and self.usages == 0: |
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388 self._abort() |
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389 |
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390 def running(self): |
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391 return self.count > 0 |
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392 |
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393 def addpending(self, category, callback): |
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394 """add a callback to be called when the transaction is pending |
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395 |
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396 The transaction will be given as callback's first argument. |
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397 |
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398 Category is a unique identifier to allow overwriting an old callback |
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399 with a newer callback. |
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400 """ |
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401 self._pendingcallback[category] = callback |
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402 |
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403 @active |
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404 def writepending(self): |
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405 '''write pending file to temporary version |
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406 |
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407 This is used to allow hooks to view a transaction before commit''' |
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408 categories = sorted(self._pendingcallback) |
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409 for cat in categories: |
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410 # remove callback since the data will have been flushed |
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411 any = self._pendingcallback.pop(cat)(self) |
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412 self._anypending = self._anypending or any |
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413 self._anypending |= self._generatefiles(suffix='.pending') |
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414 return self._anypending |
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415 |
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416 @active |
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417 def addfinalize(self, category, callback): |
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418 """add a callback to be called when the transaction is closed |
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419 |
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420 The transaction will be given as callback's first argument. |
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421 |
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422 Category is a unique identifier to allow overwriting old callbacks with |
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423 newer callbacks. |
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424 """ |
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425 self._finalizecallback[category] = callback |
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426 |
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427 @active |
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428 def addpostclose(self, category, callback): |
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429 """add or replace a callback to be called after the transaction closed |
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430 |
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431 The transaction will be given as callback's first argument. |
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432 |
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433 Category is a unique identifier to allow overwriting an old callback |
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434 with a newer callback. |
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435 """ |
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436 self._postclosecallback[category] = callback |
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437 |
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438 @active |
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439 def getpostclose(self, category): |
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440 """return a postclose callback added before, or None""" |
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441 return self._postclosecallback.get(category, None) |
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442 |
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443 @active |
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444 def addabort(self, category, callback): |
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445 """add a callback to be called when the transaction is aborted. |
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446 |
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447 The transaction will be given as the first argument to the callback. |
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448 |
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449 Category is a unique identifier to allow overwriting an old callback |
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450 with a newer callback. |
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451 """ |
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452 self._abortcallback[category] = callback |
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453 |
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454 @active |
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455 def close(self): |
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456 '''commit the transaction''' |
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457 if self.count == 1: |
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458 self.validator(self) # will raise exception if needed |
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459 self.validator = None # Help prevent cycles. |
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460 self._generatefiles(group=gengroupprefinalize) |
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461 categories = sorted(self._finalizecallback) |
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462 for cat in categories: |
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463 self._finalizecallback[cat](self) |
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464 # Prevent double usage and help clear cycles. |
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465 self._finalizecallback = None |
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466 self._generatefiles(group=gengrouppostfinalize) |
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467 |
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468 self.count -= 1 |
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469 if self.count != 0: |
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470 return |
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471 self.file.close() |
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472 self._backupsfile.close() |
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473 # cleanup temporary files |
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474 for l, f, b, c in self._backupentries: |
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475 if l not in self._vfsmap and c: |
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476 self.report("couldn't remove %s: unknown cache location %s\n" |
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477 % (b, l)) |
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478 continue |
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479 vfs = self._vfsmap[l] |
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480 if not f and b and vfs.exists(b): |
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481 try: |
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482 vfs.unlink(b) |
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483 except (IOError, OSError, error.Abort) as inst: |
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484 if not c: |
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485 raise |
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486 # Abort may be raise by read only opener |
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487 self.report("couldn't remove %s: %s\n" |
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488 % (vfs.join(b), inst)) |
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489 self.entries = [] |
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490 self._writeundo() |
95 | 491 if self.after: |
785 | 492 self.after() |
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493 self.after = None # Help prevent cycles. |
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494 if self.opener.isfile(self._backupjournal): |
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495 self.opener.unlink(self._backupjournal) |
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496 if self.opener.isfile(self.journal): |
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497 self.opener.unlink(self.journal) |
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498 for l, _f, b, c in self._backupentries: |
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499 if l not in self._vfsmap and c: |
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500 self.report("couldn't remove %s: unknown cache location" |
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501 "%s\n" % (b, l)) |
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502 continue |
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503 vfs = self._vfsmap[l] |
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504 if b and vfs.exists(b): |
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505 try: |
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506 vfs.unlink(b) |
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507 except (IOError, OSError, error.Abort) as inst: |
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508 if not c: |
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509 raise |
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510 # Abort may be raise by read only opener |
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511 self.report("couldn't remove %s: %s\n" |
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512 % (vfs.join(b), inst)) |
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513 self._backupentries = [] |
573 | 514 self.journal = None |
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515 |
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516 self.releasefn(self, True) # notify success of closing transaction |
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517 self.releasefn = None # Help prevent cycles. |
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518 |
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519 # run post close action |
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520 categories = sorted(self._postclosecallback) |
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521 for cat in categories: |
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522 self._postclosecallback[cat](self) |
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523 # Prevent double usage and help clear cycles. |
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524 self._postclosecallback = None |
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525 |
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526 @active |
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527 def abort(self): |
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528 '''abort the transaction (generally called on error, or when the |
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529 transaction is not explicitly committed before going out of |
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530 scope)''' |
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531 self._abort() |
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532 |
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533 def _writeundo(self): |
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534 """write transaction data for possible future undo call""" |
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535 if self.undoname is None: |
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536 return |
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537 undobackupfile = self.opener.open("%s.backupfiles" % self.undoname, 'w') |
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538 undobackupfile.write('%d\n' % version) |
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539 for l, f, b, c in self._backupentries: |
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540 if not f: # temporary file |
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541 continue |
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542 if not b: |
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543 u = '' |
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544 else: |
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545 if l not in self._vfsmap and c: |
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546 self.report("couldn't remove %s: unknown cache location" |
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547 "%s\n" % (b, l)) |
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548 continue |
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549 vfs = self._vfsmap[l] |
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550 base, name = vfs.split(b) |
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551 assert name.startswith(self.journal), name |
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552 uname = name.replace(self.journal, self.undoname, 1) |
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553 u = vfs.reljoin(base, uname) |
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554 util.copyfile(vfs.join(b), vfs.join(u), hardlink=True) |
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555 undobackupfile.write("%s\0%s\0%s\0%d\n" % (l, f, u, c)) |
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556 undobackupfile.close() |
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557 |
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558 |
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559 def _abort(self): |
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560 self.count = 0 |
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561 self.usages = 0 |
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562 self.file.close() |
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563 self._backupsfile.close() |
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564 |
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565 try: |
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566 if not self.entries and not self._backupentries: |
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567 if self._backupjournal: |
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568 self.opener.unlink(self._backupjournal) |
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569 if self.journal: |
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570 self.opener.unlink(self.journal) |
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571 return |
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572 |
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573 self.report(_("transaction abort!\n")) |
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574 |
108 | 575 try: |
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576 for cat in sorted(self._abortcallback): |
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577 self._abortcallback[cat](self) |
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578 # Prevent double usage and help clear cycles. |
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579 self._abortcallback = None |
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580 _playback(self.journal, self.report, self.opener, self._vfsmap, |
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581 self.entries, self._backupentries, False, |
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582 checkambigfiles=self.checkambigfiles) |
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583 self.report(_("rollback completed\n")) |
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584 except BaseException: |
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585 self.report(_("rollback failed - please run hg recover\n")) |
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586 finally: |
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587 self.journal = None |
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588 self.releasefn(self, False) # notify failure of transaction |
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589 self.releasefn = None # Help prevent cycles. |
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590 |
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591 def rollback(opener, vfsmap, file, report, checkambigfiles=None): |
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592 """Rolls back the transaction contained in the given file |
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593 |
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594 Reads the entries in the specified file, and the corresponding |
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595 '*.backupfiles' file, to recover from an incomplete transaction. |
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596 |
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597 * `file`: a file containing a list of entries, specifying where |
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598 to truncate each file. The file should contain a list of |
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599 file\0offset pairs, delimited by newlines. The corresponding |
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600 '*.backupfiles' file should contain a list of file\0backupfile |
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601 pairs, delimited by \0. |
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602 |
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603 `checkambigfiles` is a set of (path, vfs-location) tuples, |
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604 which determine whether file stat ambiguity should be avoided at |
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605 restoring corresponded files. |
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606 """ |
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607 entries = [] |
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608 backupentries = [] |
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609 |
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610 fp = opener.open(file) |
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611 lines = fp.readlines() |
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612 fp.close() |
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613 for l in lines: |
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614 try: |
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615 f, o = l.split('\0') |
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616 entries.append((f, int(o), None)) |
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617 except ValueError: |
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618 report( |
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619 _("couldn't read journal entry %r!\n") % pycompat.bytestr(l)) |
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620 |
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621 backupjournal = "%s.backupfiles" % file |
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622 if opener.exists(backupjournal): |
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623 fp = opener.open(backupjournal) |
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624 lines = fp.readlines() |
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625 if lines: |
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626 ver = lines[0][:-1] |
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627 if ver == (b'%d' % version): |
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628 for line in lines[1:]: |
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629 if line: |
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630 # Shave off the trailing newline |
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631 line = line[:-1] |
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632 l, f, b, c = line.split('\0') |
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633 backupentries.append((l, f, b, bool(c))) |
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634 else: |
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635 report(_("journal was created by a different version of " |
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636 "Mercurial\n")) |
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637 |
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638 _playback(file, report, opener, vfsmap, entries, backupentries, |
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639 checkambigfiles=checkambigfiles) |