Mercurial > hg
annotate mercurial/streamclone.py @ 39583:ee1e74ee037c
formatter: fill missing resources by formatter, not by resource mapper
While working on demand loading of ctx/fctx objects, I found it's weird
to support lookup in both directions. For instance, fctx can be loaded
from (ctx, path) pair, but ctx may also be derived from fctx.changectx()
in the original mapping. If the original mapping has had fctx but no ctx,
and if the new mapping provides {path}, we can't be sure if fctx should be
updated by fctx'.changectx()[path] or not.
This patch simply drops the support for the resolution in fctx -> ctx -> repo
direction.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sat, 01 Sep 2018 13:21:45 +0900 |
parents | e7aa113b14f7 |
children | b10d145837bc |
rev | line source |
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1 # streamclone.py - producing and consuming streaming repository data |
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2 # |
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3 # Copyright 2015 Gregory Szorc <gregory.szorc@gmail.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import contextlib |
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11 import os |
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12 import struct |
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13 import warnings |
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14 |
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15 from .i18n import _ |
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16 from . import ( |
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17 branchmap, |
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18 cacheutil, |
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19 error, |
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20 phases, |
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21 pycompat, |
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22 store, |
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23 util, |
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24 ) |
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25 |
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26 def canperformstreamclone(pullop, bundle2=False): |
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27 """Whether it is possible to perform a streaming clone as part of pull. |
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28 |
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29 ``bundle2`` will cause the function to consider stream clone through |
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30 bundle2 and only through bundle2. |
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31 |
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32 Returns a tuple of (supported, requirements). ``supported`` is True if |
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33 streaming clone is supported and False otherwise. ``requirements`` is |
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34 a set of repo requirements from the remote, or ``None`` if stream clone |
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35 isn't supported. |
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36 """ |
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37 repo = pullop.repo |
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38 remote = pullop.remote |
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39 |
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40 bundle2supported = False |
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41 if pullop.canusebundle2: |
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42 if 'v2' in pullop.remotebundle2caps.get('stream', []): |
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43 bundle2supported = True |
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44 # else |
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45 # Server doesn't support bundle2 stream clone or doesn't support |
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46 # the versions we support. Fall back and possibly allow legacy. |
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47 |
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48 # Ensures legacy code path uses available bundle2. |
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49 if bundle2supported and not bundle2: |
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50 return False, None |
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51 # Ensures bundle2 doesn't try to do a stream clone if it isn't supported. |
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52 elif bundle2 and not bundle2supported: |
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53 return False, None |
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54 |
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55 # Streaming clone only works on empty repositories. |
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56 if len(repo): |
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57 return False, None |
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58 |
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59 # Streaming clone only works if all data is being requested. |
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60 if pullop.heads: |
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61 return False, None |
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62 |
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63 streamrequested = pullop.streamclonerequested |
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64 |
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65 # If we don't have a preference, let the server decide for us. This |
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66 # likely only comes into play in LANs. |
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67 if streamrequested is None: |
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68 # The server can advertise whether to prefer streaming clone. |
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69 streamrequested = remote.capable('stream-preferred') |
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70 |
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71 if not streamrequested: |
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72 return False, None |
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73 |
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74 # In order for stream clone to work, the client has to support all the |
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75 # requirements advertised by the server. |
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76 # |
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77 # The server advertises its requirements via the "stream" and "streamreqs" |
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78 # capability. "stream" (a value-less capability) is advertised if and only |
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79 # if the only requirement is "revlogv1." Else, the "streamreqs" capability |
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80 # is advertised and contains a comma-delimited list of requirements. |
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81 requirements = set() |
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82 if remote.capable('stream'): |
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83 requirements.add('revlogv1') |
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84 else: |
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85 streamreqs = remote.capable('streamreqs') |
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86 # This is weird and shouldn't happen with modern servers. |
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87 if not streamreqs: |
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88 pullop.repo.ui.warn(_( |
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89 'warning: stream clone requested but server has them ' |
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90 'disabled\n')) |
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91 return False, None |
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92 |
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93 streamreqs = set(streamreqs.split(',')) |
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94 # Server requires something we don't support. Bail. |
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95 missingreqs = streamreqs - repo.supportedformats |
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96 if missingreqs: |
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97 pullop.repo.ui.warn(_( |
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98 'warning: stream clone requested but client is missing ' |
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99 'requirements: %s\n') % ', '.join(sorted(missingreqs))) |
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100 pullop.repo.ui.warn( |
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101 _('(see https://www.mercurial-scm.org/wiki/MissingRequirement ' |
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102 'for more information)\n')) |
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103 return False, None |
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104 requirements = streamreqs |
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105 |
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106 return True, requirements |
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107 |
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108 def maybeperformlegacystreamclone(pullop): |
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109 """Possibly perform a legacy stream clone operation. |
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110 |
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111 Legacy stream clones are performed as part of pull but before all other |
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112 operations. |
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113 |
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114 A legacy stream clone will not be performed if a bundle2 stream clone is |
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115 supported. |
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116 """ |
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117 supported, requirements = canperformstreamclone(pullop) |
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118 |
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119 if not supported: |
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120 return |
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121 |
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122 repo = pullop.repo |
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123 remote = pullop.remote |
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124 |
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125 # Save remote branchmap. We will use it later to speed up branchcache |
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126 # creation. |
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127 rbranchmap = None |
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128 if remote.capable('branchmap'): |
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129 with remote.commandexecutor() as e: |
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130 rbranchmap = e.callcommand('branchmap', {}).result() |
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131 |
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132 repo.ui.status(_('streaming all changes\n')) |
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133 |
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134 with remote.commandexecutor() as e: |
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135 fp = e.callcommand('stream_out', {}).result() |
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136 |
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137 # TODO strictly speaking, this code should all be inside the context |
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138 # manager because the context manager is supposed to ensure all wire state |
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139 # is flushed when exiting. But the legacy peers don't do this, so it |
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140 # doesn't matter. |
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141 l = fp.readline() |
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142 try: |
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143 resp = int(l) |
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144 except ValueError: |
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145 raise error.ResponseError( |
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146 _('unexpected response from remote server:'), l) |
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147 if resp == 1: |
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148 raise error.Abort(_('operation forbidden by server')) |
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149 elif resp == 2: |
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150 raise error.Abort(_('locking the remote repository failed')) |
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151 elif resp != 0: |
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152 raise error.Abort(_('the server sent an unknown error code')) |
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153 |
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154 l = fp.readline() |
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155 try: |
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156 filecount, bytecount = map(int, l.split(' ', 1)) |
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157 except (ValueError, TypeError): |
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158 raise error.ResponseError( |
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159 _('unexpected response from remote server:'), l) |
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160 |
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161 with repo.lock(): |
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162 consumev1(repo, fp, filecount, bytecount) |
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163 |
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164 # new requirements = old non-format requirements + |
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165 # new format-related remote requirements |
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166 # requirements from the streamed-in repository |
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167 repo.requirements = requirements | ( |
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168 repo.requirements - repo.supportedformats) |
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169 repo._applyopenerreqs() |
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170 repo._writerequirements() |
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171 |
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172 if rbranchmap: |
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173 branchmap.replacecache(repo, rbranchmap) |
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174 |
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175 repo.invalidate() |
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176 |
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177 def allowservergeneration(repo): |
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178 """Whether streaming clones are allowed from the server.""" |
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179 if not repo.ui.configbool('server', 'uncompressed', untrusted=True): |
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180 return False |
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181 |
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182 # The way stream clone works makes it impossible to hide secret changesets. |
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183 # So don't allow this by default. |
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184 secret = phases.hassecret(repo) |
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185 if secret: |
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186 return repo.ui.configbool('server', 'uncompressedallowsecret') |
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187 |
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188 return True |
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189 |
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190 # This is it's own function so extensions can override it. |
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191 def _walkstreamfiles(repo): |
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192 return repo.store.walk() |
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193 |
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194 def generatev1(repo): |
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195 """Emit content for version 1 of a streaming clone. |
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196 |
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197 This returns a 3-tuple of (file count, byte size, data iterator). |
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198 |
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199 The data iterator consists of N entries for each file being transferred. |
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200 Each file entry starts as a line with the file name and integer size |
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201 delimited by a null byte. |
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202 |
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203 The raw file data follows. Following the raw file data is the next file |
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204 entry, or EOF. |
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205 |
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206 When used on the wire protocol, an additional line indicating protocol |
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207 success will be prepended to the stream. This function is not responsible |
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208 for adding it. |
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209 |
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210 This function will obtain a repository lock to ensure a consistent view of |
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211 the store is captured. It therefore may raise LockError. |
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212 """ |
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213 entries = [] |
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214 total_bytes = 0 |
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215 # Get consistent snapshot of repo, lock during scan. |
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216 with repo.lock(): |
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217 repo.ui.debug('scanning\n') |
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218 for name, ename, size in _walkstreamfiles(repo): |
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219 if size: |
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220 entries.append((name, size)) |
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221 total_bytes += size |
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222 |
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223 repo.ui.debug('%d files, %d bytes to transfer\n' % |
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224 (len(entries), total_bytes)) |
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225 |
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226 svfs = repo.svfs |
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227 debugflag = repo.ui.debugflag |
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228 |
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229 def emitrevlogdata(): |
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230 for name, size in entries: |
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231 if debugflag: |
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232 repo.ui.debug('sending %s (%d bytes)\n' % (name, size)) |
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233 # partially encode name over the wire for backwards compat |
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234 yield '%s\0%d\n' % (store.encodedir(name), size) |
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235 # auditing at this stage is both pointless (paths are already |
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236 # trusted by the local repo) and expensive |
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237 with svfs(name, 'rb', auditpath=False) as fp: |
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238 if size <= 65536: |
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239 yield fp.read(size) |
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240 else: |
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241 for chunk in util.filechunkiter(fp, limit=size): |
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242 yield chunk |
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243 |
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244 return len(entries), total_bytes, emitrevlogdata() |
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245 |
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246 def generatev1wireproto(repo): |
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247 """Emit content for version 1 of streaming clone suitable for the wire. |
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248 |
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249 This is the data output from ``generatev1()`` with 2 header lines. The |
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250 first line indicates overall success. The 2nd contains the file count and |
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251 byte size of payload. |
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252 |
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253 The success line contains "0" for success, "1" for stream generation not |
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254 allowed, and "2" for error locking the repository (possibly indicating |
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255 a permissions error for the server process). |
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256 """ |
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257 if not allowservergeneration(repo): |
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258 yield '1\n' |
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259 return |
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260 |
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261 try: |
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262 filecount, bytecount, it = generatev1(repo) |
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263 except error.LockError: |
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264 yield '2\n' |
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265 return |
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266 |
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267 # Indicates successful response. |
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268 yield '0\n' |
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269 yield '%d %d\n' % (filecount, bytecount) |
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270 for chunk in it: |
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271 yield chunk |
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272 |
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273 def generatebundlev1(repo, compression='UN'): |
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274 """Emit content for version 1 of a stream clone bundle. |
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275 |
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276 The first 4 bytes of the output ("HGS1") denote this as stream clone |
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277 bundle version 1. |
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278 |
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279 The next 2 bytes indicate the compression type. Only "UN" is currently |
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280 supported. |
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281 |
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282 The next 16 bytes are two 64-bit big endian unsigned integers indicating |
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283 file count and byte count, respectively. |
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284 |
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285 The next 2 bytes is a 16-bit big endian unsigned short declaring the length |
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286 of the requirements string, including a trailing \0. The following N bytes |
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287 are the requirements string, which is ASCII containing a comma-delimited |
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288 list of repo requirements that are needed to support the data. |
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289 |
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290 The remaining content is the output of ``generatev1()`` (which may be |
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291 compressed in the future). |
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292 |
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293 Returns a tuple of (requirements, data generator). |
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294 """ |
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295 if compression != 'UN': |
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296 raise ValueError('we do not support the compression argument yet') |
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297 |
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298 requirements = repo.requirements & repo.supportedformats |
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299 requires = ','.join(sorted(requirements)) |
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300 |
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301 def gen(): |
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302 yield 'HGS1' |
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303 yield compression |
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304 |
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305 filecount, bytecount, it = generatev1(repo) |
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306 repo.ui.status(_('writing %d bytes for %d files\n') % |
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307 (bytecount, filecount)) |
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308 |
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309 yield struct.pack('>QQ', filecount, bytecount) |
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310 yield struct.pack('>H', len(requires) + 1) |
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311 yield requires + '\0' |
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312 |
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313 # This is where we'll add compression in the future. |
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314 assert compression == 'UN' |
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315 |
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316 progress = repo.ui.makeprogress(_('bundle'), total=bytecount, |
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317 unit=_('bytes')) |
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318 progress.update(0) |
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319 |
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320 for chunk in it: |
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321 progress.increment(step=len(chunk)) |
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322 yield chunk |
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323 |
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324 progress.complete() |
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325 |
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326 return requirements, gen() |
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327 |
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328 def consumev1(repo, fp, filecount, bytecount): |
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329 """Apply the contents from version 1 of a streaming clone file handle. |
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330 |
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331 This takes the output from "stream_out" and applies it to the specified |
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332 repository. |
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333 |
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334 Like "stream_out," the status line added by the wire protocol is not |
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335 handled by this function. |
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336 """ |
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337 with repo.lock(): |
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338 repo.ui.status(_('%d files to transfer, %s of data\n') % |
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339 (filecount, util.bytecount(bytecount))) |
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340 progress = repo.ui.makeprogress(_('clone'), total=bytecount, |
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341 unit=_('bytes')) |
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342 progress.update(0) |
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343 start = util.timer() |
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344 |
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345 # TODO: get rid of (potential) inconsistency |
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346 # |
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347 # If transaction is started and any @filecache property is |
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348 # changed at this point, it causes inconsistency between |
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349 # in-memory cached property and streamclone-ed file on the |
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350 # disk. Nested transaction prevents transaction scope "clone" |
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351 # below from writing in-memory changes out at the end of it, |
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352 # even though in-memory changes are discarded at the end of it |
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353 # regardless of transaction nesting. |
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354 # |
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355 # But transaction nesting can't be simply prohibited, because |
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356 # nesting occurs also in ordinary case (e.g. enabling |
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357 # clonebundles). |
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358 |
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359 with repo.transaction('clone'): |
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360 with repo.svfs.backgroundclosing(repo.ui, expectedcount=filecount): |
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361 for i in pycompat.xrange(filecount): |
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362 # XXX doesn't support '\n' or '\r' in filenames |
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363 l = fp.readline() |
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364 try: |
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365 name, size = l.split('\0', 1) |
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366 size = int(size) |
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367 except (ValueError, TypeError): |
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368 raise error.ResponseError( |
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369 _('unexpected response from remote server:'), l) |
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370 if repo.ui.debugflag: |
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371 repo.ui.debug('adding %s (%s)\n' % |
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372 (name, util.bytecount(size))) |
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373 # for backwards compat, name was partially encoded |
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374 path = store.decodedir(name) |
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375 with repo.svfs(path, 'w', backgroundclose=True) as ofp: |
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376 for chunk in util.filechunkiter(fp, limit=size): |
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377 progress.increment(step=len(chunk)) |
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378 ofp.write(chunk) |
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379 |
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380 # force @filecache properties to be reloaded from |
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381 # streamclone-ed file at next access |
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382 repo.invalidate(clearfilecache=True) |
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383 |
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384 elapsed = util.timer() - start |
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385 if elapsed <= 0: |
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386 elapsed = 0.001 |
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387 progress.complete() |
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388 repo.ui.status(_('transferred %s in %.1f seconds (%s/sec)\n') % |
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389 (util.bytecount(bytecount), elapsed, |
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390 util.bytecount(bytecount / elapsed))) |
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391 |
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392 def readbundle1header(fp): |
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393 compression = fp.read(2) |
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394 if compression != 'UN': |
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395 raise error.Abort(_('only uncompressed stream clone bundles are ' |
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396 'supported; got %s') % compression) |
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397 |
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398 filecount, bytecount = struct.unpack('>QQ', fp.read(16)) |
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399 requireslen = struct.unpack('>H', fp.read(2))[0] |
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400 requires = fp.read(requireslen) |
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401 |
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402 if not requires.endswith('\0'): |
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403 raise error.Abort(_('malformed stream clone bundle: ' |
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404 'requirements not properly encoded')) |
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405 |
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406 requirements = set(requires.rstrip('\0').split(',')) |
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407 |
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408 return filecount, bytecount, requirements |
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409 |
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410 def applybundlev1(repo, fp): |
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411 """Apply the content from a stream clone bundle version 1. |
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412 |
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413 We assume the 4 byte header has been read and validated and the file handle |
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414 is at the 2 byte compression identifier. |
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415 """ |
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416 if len(repo): |
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417 raise error.Abort(_('cannot apply stream clone bundle on non-empty ' |
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418 'repo')) |
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419 |
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420 filecount, bytecount, requirements = readbundle1header(fp) |
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421 missingreqs = requirements - repo.supportedformats |
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422 if missingreqs: |
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423 raise error.Abort(_('unable to apply stream clone: ' |
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424 'unsupported format: %s') % |
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425 ', '.join(sorted(missingreqs))) |
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426 |
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427 consumev1(repo, fp, filecount, bytecount) |
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428 |
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429 class streamcloneapplier(object): |
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430 """Class to manage applying streaming clone bundles. |
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431 |
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432 We need to wrap ``applybundlev1()`` in a dedicated type to enable bundle |
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433 readers to perform bundle type-specific functionality. |
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434 """ |
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435 def __init__(self, fh): |
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436 self._fh = fh |
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437 |
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438 def apply(self, repo): |
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439 return applybundlev1(repo, self._fh) |
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440 |
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441 # type of file to stream |
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442 _fileappend = 0 # append only file |
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443 _filefull = 1 # full snapshot file |
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444 |
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445 # Source of the file |
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446 _srcstore = 's' # store (svfs) |
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447 _srccache = 'c' # cache (cache) |
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448 |
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449 # This is it's own function so extensions can override it. |
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450 def _walkstreamfullstorefiles(repo): |
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451 """list snapshot file from the store""" |
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452 fnames = [] |
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453 if not repo.publishing(): |
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454 fnames.append('phaseroots') |
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455 return fnames |
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456 |
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457 def _filterfull(entry, copy, vfsmap): |
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458 """actually copy the snapshot files""" |
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459 src, name, ftype, data = entry |
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460 if ftype != _filefull: |
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461 return entry |
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462 return (src, name, ftype, copy(vfsmap[src].join(name))) |
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463 |
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464 @contextlib.contextmanager |
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465 def maketempcopies(): |
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466 """return a function to temporary copy file""" |
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467 files = [] |
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468 try: |
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469 def copy(src): |
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470 fd, dst = pycompat.mkstemp() |
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471 os.close(fd) |
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472 files.append(dst) |
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473 util.copyfiles(src, dst, hardlink=True) |
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474 return dst |
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475 yield copy |
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476 finally: |
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477 for tmp in files: |
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478 util.tryunlink(tmp) |
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479 |
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480 def _makemap(repo): |
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481 """make a (src -> vfs) map for the repo""" |
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482 vfsmap = { |
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483 _srcstore: repo.svfs, |
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484 _srccache: repo.cachevfs, |
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485 } |
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486 # we keep repo.vfs out of the on purpose, ther are too many danger there |
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487 # (eg: .hg/hgrc) |
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488 assert repo.vfs not in vfsmap.values() |
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489 |
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490 return vfsmap |
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491 |
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492 def _emit2(repo, entries, totalfilesize): |
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493 """actually emit the stream bundle""" |
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494 vfsmap = _makemap(repo) |
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495 progress = repo.ui.makeprogress(_('bundle'), total=totalfilesize, |
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496 unit=_('bytes')) |
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497 progress.update(0) |
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498 with maketempcopies() as copy, progress: |
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499 # copy is delayed until we are in the try |
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500 entries = [_filterfull(e, copy, vfsmap) for e in entries] |
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501 yield None # this release the lock on the repository |
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502 seen = 0 |
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503 |
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504 for src, name, ftype, data in entries: |
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505 vfs = vfsmap[src] |
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506 yield src |
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507 yield util.uvarintencode(len(name)) |
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508 if ftype == _fileappend: |
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509 fp = vfs(name) |
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510 size = data |
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511 elif ftype == _filefull: |
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512 fp = open(data, 'rb') |
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513 size = util.fstat(fp).st_size |
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514 try: |
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515 yield util.uvarintencode(size) |
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516 yield name |
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517 if size <= 65536: |
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518 chunks = (fp.read(size),) |
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519 else: |
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520 chunks = util.filechunkiter(fp, limit=size) |
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521 for chunk in chunks: |
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522 seen += len(chunk) |
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523 progress.update(seen) |
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524 yield chunk |
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525 finally: |
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526 fp.close() |
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527 |
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528 def generatev2(repo): |
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529 """Emit content for version 2 of a streaming clone. |
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530 |
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531 the data stream consists the following entries: |
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532 1) A char representing the file destination (eg: store or cache) |
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533 2) A varint containing the length of the filename |
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534 3) A varint containing the length of file data |
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535 4) N bytes containing the filename (the internal, store-agnostic form) |
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536 5) N bytes containing the file data |
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537 |
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538 Returns a 3-tuple of (file count, file size, data iterator). |
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539 """ |
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540 |
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541 with repo.lock(): |
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542 |
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543 entries = [] |
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544 totalfilesize = 0 |
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545 |
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546 repo.ui.debug('scanning\n') |
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547 for name, ename, size in _walkstreamfiles(repo): |
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548 if size: |
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549 entries.append((_srcstore, name, _fileappend, size)) |
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550 totalfilesize += size |
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551 for name in _walkstreamfullstorefiles(repo): |
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552 if repo.svfs.exists(name): |
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553 totalfilesize += repo.svfs.lstat(name).st_size |
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554 entries.append((_srcstore, name, _filefull, None)) |
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555 for name in cacheutil.cachetocopy(repo): |
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556 if repo.cachevfs.exists(name): |
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557 totalfilesize += repo.cachevfs.lstat(name).st_size |
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558 entries.append((_srccache, name, _filefull, None)) |
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559 |
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560 chunks = _emit2(repo, entries, totalfilesize) |
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561 first = next(chunks) |
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562 assert first is None |
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563 |
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564 return len(entries), totalfilesize, chunks |
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565 |
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566 @contextlib.contextmanager |
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567 def nested(*ctxs): |
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568 with warnings.catch_warnings(): |
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569 # For some reason, Python decided 'nested' was deprecated without |
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570 # replacement. They officially advertised for filtering the deprecation |
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571 # warning for people who actually need the feature. |
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572 warnings.filterwarnings("ignore",category=DeprecationWarning) |
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573 with contextlib.nested(*ctxs): |
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574 yield |
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575 |
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576 def consumev2(repo, fp, filecount, filesize): |
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577 """Apply the contents from a version 2 streaming clone. |
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578 |
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579 Data is read from an object that only needs to provide a ``read(size)`` |
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580 method. |
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581 """ |
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582 with repo.lock(): |
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583 repo.ui.status(_('%d files to transfer, %s of data\n') % |
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584 (filecount, util.bytecount(filesize))) |
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585 |
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586 start = util.timer() |
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587 progress = repo.ui.makeprogress(_('clone'), total=filesize, |
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588 unit=_('bytes')) |
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589 progress.update(0) |
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590 |
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591 vfsmap = _makemap(repo) |
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592 |
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593 with repo.transaction('clone'): |
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594 ctxs = (vfs.backgroundclosing(repo.ui) |
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595 for vfs in vfsmap.values()) |
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596 with nested(*ctxs): |
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597 for i in range(filecount): |
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598 src = util.readexactly(fp, 1) |
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599 vfs = vfsmap[src] |
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600 namelen = util.uvarintdecodestream(fp) |
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601 datalen = util.uvarintdecodestream(fp) |
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602 |
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603 name = util.readexactly(fp, namelen) |
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604 |
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605 if repo.ui.debugflag: |
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606 repo.ui.debug('adding [%s] %s (%s)\n' % |
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607 (src, name, util.bytecount(datalen))) |
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608 |
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609 with vfs(name, 'w') as ofp: |
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610 for chunk in util.filechunkiter(fp, limit=datalen): |
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611 progress.increment(step=len(chunk)) |
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612 ofp.write(chunk) |
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613 |
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614 # force @filecache properties to be reloaded from |
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615 # streamclone-ed file at next access |
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616 repo.invalidate(clearfilecache=True) |
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617 |
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618 elapsed = util.timer() - start |
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619 if elapsed <= 0: |
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620 elapsed = 0.001 |
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621 repo.ui.status(_('transferred %s in %.1f seconds (%s/sec)\n') % |
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622 (util.bytecount(progress.pos), elapsed, |
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623 util.bytecount(progress.pos / elapsed))) |
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624 progress.complete() |
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625 |
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626 def applybundlev2(repo, fp, filecount, filesize, requirements): |
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627 missingreqs = [r for r in requirements if r not in repo.supported] |
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628 if missingreqs: |
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629 raise error.Abort(_('unable to apply stream clone: ' |
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630 'unsupported format: %s') % |
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631 ', '.join(sorted(missingreqs))) |
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632 |
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633 consumev2(repo, fp, filecount, filesize) |
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634 |
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635 # new requirements = old non-format requirements + |
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636 # new format-related remote requirements |
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637 # requirements from the streamed-in repository |
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638 repo.requirements = set(requirements) | ( |
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639 repo.requirements - repo.supportedformats) |
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640 repo._applyopenerreqs() |
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641 repo._writerequirements() |