Mercurial > hg
annotate mercurial/streamclone.py @ 27367:8833daddfc3f
test: rename 'check-code' own test to 'test-contrib-check-code.t'
This test (making sure the 'check-code' script run as intended) have been
confused with the test making that the mercurial code base comply with our
coding still by multiple generations of contributors.
We are moving it out of the way so that all tests starting with
'test-check' are now doing compliance testing.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Sat, 05 Dec 2015 22:47:26 -0800 |
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children | 9fea6b38a8da |
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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 struct |
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11 import time |
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12 |
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13 from .i18n import _ |
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14 from . import ( |
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15 branchmap, |
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16 error, |
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17 store, |
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18 util, |
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19 ) |
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20 |
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21 def canperformstreamclone(pullop, bailifbundle2supported=False): |
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22 """Whether it is possible to perform a streaming clone as part of pull. |
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23 |
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24 ``bailifbundle2supported`` will cause the function to return False if |
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25 bundle2 stream clones are supported. It should only be called by the |
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26 legacy stream clone code path. |
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27 |
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28 Returns a tuple of (supported, requirements). ``supported`` is True if |
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29 streaming clone is supported and False otherwise. ``requirements`` is |
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30 a set of repo requirements from the remote, or ``None`` if stream clone |
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31 isn't supported. |
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32 """ |
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33 repo = pullop.repo |
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34 remote = pullop.remote |
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35 |
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36 bundle2supported = False |
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37 if pullop.canusebundle2: |
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38 if 'v1' in pullop.remotebundle2caps.get('stream', []): |
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39 bundle2supported = True |
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40 # else |
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41 # Server doesn't support bundle2 stream clone or doesn't support |
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42 # the versions we support. Fall back and possibly allow legacy. |
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43 |
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44 # Ensures legacy code path uses available bundle2. |
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45 if bailifbundle2supported and bundle2supported: |
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46 return False, None |
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47 # Ensures bundle2 doesn't try to do a stream clone if it isn't supported. |
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48 #elif not bailifbundle2supported and not bundle2supported: |
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49 # return False, None |
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50 |
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51 # Streaming clone only works on empty repositories. |
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52 if len(repo): |
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53 return False, None |
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54 |
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55 # Streaming clone only works if all data is being requested. |
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56 if pullop.heads: |
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57 return False, None |
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58 |
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59 streamrequested = pullop.streamclonerequested |
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60 |
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61 # If we don't have a preference, let the server decide for us. This |
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62 # likely only comes into play in LANs. |
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63 if streamrequested is None: |
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64 # The server can advertise whether to prefer streaming clone. |
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65 streamrequested = remote.capable('stream-preferred') |
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66 |
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67 if not streamrequested: |
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68 return False, None |
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69 |
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70 # In order for stream clone to work, the client has to support all the |
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71 # requirements advertised by the server. |
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72 # |
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73 # The server advertises its requirements via the "stream" and "streamreqs" |
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74 # capability. "stream" (a value-less capability) is advertised if and only |
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75 # if the only requirement is "revlogv1." Else, the "streamreqs" capability |
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76 # is advertised and contains a comma-delimited list of requirements. |
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77 requirements = set() |
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78 if remote.capable('stream'): |
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79 requirements.add('revlogv1') |
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80 else: |
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81 streamreqs = remote.capable('streamreqs') |
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82 # This is weird and shouldn't happen with modern servers. |
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83 if not streamreqs: |
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84 return False, None |
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85 |
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86 streamreqs = set(streamreqs.split(',')) |
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87 # Server requires something we don't support. Bail. |
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88 if streamreqs - repo.supportedformats: |
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89 return False, None |
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90 requirements = streamreqs |
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91 |
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92 return True, requirements |
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93 |
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94 def maybeperformlegacystreamclone(pullop): |
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95 """Possibly perform a legacy stream clone operation. |
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96 |
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97 Legacy stream clones are performed as part of pull but before all other |
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98 operations. |
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99 |
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100 A legacy stream clone will not be performed if a bundle2 stream clone is |
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101 supported. |
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102 """ |
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103 supported, requirements = canperformstreamclone(pullop) |
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104 |
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105 if not supported: |
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106 return |
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107 |
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108 repo = pullop.repo |
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109 remote = pullop.remote |
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110 |
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111 # Save remote branchmap. We will use it later to speed up branchcache |
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112 # creation. |
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113 rbranchmap = None |
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114 if remote.capable('branchmap'): |
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115 rbranchmap = remote.branchmap() |
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116 |
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117 repo.ui.status(_('streaming all changes\n')) |
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118 |
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119 fp = remote.stream_out() |
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120 l = fp.readline() |
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121 try: |
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122 resp = int(l) |
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123 except ValueError: |
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124 raise error.ResponseError( |
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125 _('unexpected response from remote server:'), l) |
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126 if resp == 1: |
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127 raise error.Abort(_('operation forbidden by server')) |
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128 elif resp == 2: |
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129 raise error.Abort(_('locking the remote repository failed')) |
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130 elif resp != 0: |
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131 raise error.Abort(_('the server sent an unknown error code')) |
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132 |
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133 l = fp.readline() |
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134 try: |
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135 filecount, bytecount = map(int, l.split(' ', 1)) |
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136 except (ValueError, TypeError): |
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137 raise error.ResponseError( |
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138 _('unexpected response from remote server:'), l) |
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139 |
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140 lock = repo.lock() |
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141 try: |
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142 consumev1(repo, fp, filecount, bytecount) |
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143 |
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144 # new requirements = old non-format requirements + |
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145 # new format-related remote requirements |
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146 # requirements from the streamed-in repository |
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147 repo.requirements = requirements | ( |
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148 repo.requirements - repo.supportedformats) |
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149 repo._applyopenerreqs() |
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150 repo._writerequirements() |
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151 |
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152 if rbranchmap: |
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153 branchmap.replacecache(repo, rbranchmap) |
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154 |
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155 repo.invalidate() |
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156 finally: |
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157 lock.release() |
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158 |
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159 def allowservergeneration(ui): |
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160 """Whether streaming clones are allowed from the server.""" |
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161 return ui.configbool('server', 'uncompressed', True, untrusted=True) |
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162 |
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163 # This is it's own function so extensions can override it. |
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164 def _walkstreamfiles(repo): |
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165 return repo.store.walk() |
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166 |
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167 def generatev1(repo): |
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168 """Emit content for version 1 of a streaming clone. |
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169 |
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170 This returns a 3-tuple of (file count, byte size, data iterator). |
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171 |
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172 The data iterator consists of N entries for each file being transferred. |
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173 Each file entry starts as a line with the file name and integer size |
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174 delimited by a null byte. |
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175 |
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176 The raw file data follows. Following the raw file data is the next file |
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177 entry, or EOF. |
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178 |
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179 When used on the wire protocol, an additional line indicating protocol |
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180 success will be prepended to the stream. This function is not responsible |
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181 for adding it. |
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182 |
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183 This function will obtain a repository lock to ensure a consistent view of |
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184 the store is captured. It therefore may raise LockError. |
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185 """ |
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186 entries = [] |
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187 total_bytes = 0 |
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188 # Get consistent snapshot of repo, lock during scan. |
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189 lock = repo.lock() |
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190 try: |
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191 repo.ui.debug('scanning\n') |
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192 for name, ename, size in _walkstreamfiles(repo): |
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193 if size: |
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194 entries.append((name, size)) |
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195 total_bytes += size |
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196 finally: |
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197 lock.release() |
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198 |
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199 repo.ui.debug('%d files, %d bytes to transfer\n' % |
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200 (len(entries), total_bytes)) |
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201 |
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202 svfs = repo.svfs |
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203 oldaudit = svfs.mustaudit |
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204 debugflag = repo.ui.debugflag |
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205 svfs.mustaudit = False |
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206 |
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207 def emitrevlogdata(): |
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208 try: |
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209 for name, size in entries: |
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210 if debugflag: |
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211 repo.ui.debug('sending %s (%d bytes)\n' % (name, size)) |
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212 # partially encode name over the wire for backwards compat |
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213 yield '%s\0%d\n' % (store.encodedir(name), size) |
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214 if size <= 65536: |
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215 fp = svfs(name) |
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216 try: |
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217 data = fp.read(size) |
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218 finally: |
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219 fp.close() |
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220 yield data |
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221 else: |
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222 for chunk in util.filechunkiter(svfs(name), limit=size): |
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223 yield chunk |
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224 finally: |
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225 svfs.mustaudit = oldaudit |
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226 |
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227 return len(entries), total_bytes, emitrevlogdata() |
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228 |
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229 def generatev1wireproto(repo): |
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230 """Emit content for version 1 of streaming clone suitable for the wire. |
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231 |
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232 This is the data output from ``generatev1()`` with a header line |
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233 indicating file count and byte size. |
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234 """ |
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235 filecount, bytecount, it = generatev1(repo) |
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236 yield '%d %d\n' % (filecount, bytecount) |
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237 for chunk in it: |
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238 yield chunk |
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239 |
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240 def generatebundlev1(repo, compression='UN'): |
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241 """Emit content for version 1 of a stream clone bundle. |
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242 |
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243 The first 4 bytes of the output ("HGS1") denote this as stream clone |
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244 bundle version 1. |
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245 |
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246 The next 2 bytes indicate the compression type. Only "UN" is currently |
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247 supported. |
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248 |
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249 The next 16 bytes are two 64-bit big endian unsigned integers indicating |
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250 file count and byte count, respectively. |
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251 |
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252 The next 2 bytes is a 16-bit big endian unsigned short declaring the length |
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253 of the requirements string, including a trailing \0. The following N bytes |
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254 are the requirements string, which is ASCII containing a comma-delimited |
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255 list of repo requirements that are needed to support the data. |
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256 |
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257 The remaining content is the output of ``generatev1()`` (which may be |
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258 compressed in the future). |
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259 |
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260 Returns a tuple of (requirements, data generator). |
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261 """ |
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262 if compression != 'UN': |
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263 raise ValueError('we do not support the compression argument yet') |
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264 |
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265 requirements = repo.requirements & repo.supportedformats |
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266 requires = ','.join(sorted(requirements)) |
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267 |
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268 def gen(): |
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269 yield 'HGS1' |
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270 yield compression |
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271 |
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272 filecount, bytecount, it = generatev1(repo) |
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273 repo.ui.status(_('writing %d bytes for %d files\n') % |
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274 (bytecount, filecount)) |
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275 |
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276 yield struct.pack('>QQ', filecount, bytecount) |
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277 yield struct.pack('>H', len(requires) + 1) |
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278 yield requires + '\0' |
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279 |
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280 # This is where we'll add compression in the future. |
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281 assert compression == 'UN' |
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282 |
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283 seen = 0 |
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284 repo.ui.progress(_('bundle'), 0, total=bytecount) |
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285 |
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286 for chunk in it: |
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287 seen += len(chunk) |
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288 repo.ui.progress(_('bundle'), seen, total=bytecount) |
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289 yield chunk |
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290 |
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291 repo.ui.progress(_('bundle'), None) |
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292 |
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293 return requirements, gen() |
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294 |
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295 def consumev1(repo, fp, filecount, bytecount): |
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296 """Apply the contents from version 1 of a streaming clone file handle. |
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297 |
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298 This takes the output from "streamout" and applies it to the specified |
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299 repository. |
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300 |
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301 Like "streamout," the status line added by the wire protocol is not handled |
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302 by this function. |
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303 """ |
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304 lock = repo.lock() |
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305 try: |
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306 repo.ui.status(_('%d files to transfer, %s of data\n') % |
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307 (filecount, util.bytecount(bytecount))) |
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308 handled_bytes = 0 |
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309 repo.ui.progress(_('clone'), 0, total=bytecount) |
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310 start = time.time() |
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311 |
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312 tr = repo.transaction(_('clone')) |
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313 try: |
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314 for i in xrange(filecount): |
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315 # XXX doesn't support '\n' or '\r' in filenames |
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316 l = fp.readline() |
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317 try: |
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318 name, size = l.split('\0', 1) |
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319 size = int(size) |
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320 except (ValueError, TypeError): |
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321 raise error.ResponseError( |
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322 _('unexpected response from remote server:'), l) |
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323 if repo.ui.debugflag: |
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324 repo.ui.debug('adding %s (%s)\n' % |
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325 (name, util.bytecount(size))) |
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326 # for backwards compat, name was partially encoded |
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327 ofp = repo.svfs(store.decodedir(name), 'w') |
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328 for chunk in util.filechunkiter(fp, limit=size): |
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329 handled_bytes += len(chunk) |
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330 repo.ui.progress(_('clone'), handled_bytes, total=bytecount) |
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331 ofp.write(chunk) |
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332 ofp.close() |
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333 tr.close() |
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334 finally: |
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335 tr.release() |
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336 |
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337 # Writing straight to files circumvented the inmemory caches |
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338 repo.invalidate() |
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339 |
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340 elapsed = time.time() - start |
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341 if elapsed <= 0: |
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342 elapsed = 0.001 |
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343 repo.ui.progress(_('clone'), None) |
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344 repo.ui.status(_('transferred %s in %.1f seconds (%s/sec)\n') % |
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345 (util.bytecount(bytecount), elapsed, |
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346 util.bytecount(bytecount / elapsed))) |
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347 finally: |
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348 lock.release() |
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349 |
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350 def applybundlev1(repo, fp): |
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351 """Apply the content from a stream clone bundle version 1. |
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352 |
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353 We assume the 4 byte header has been read and validated and the file handle |
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354 is at the 2 byte compression identifier. |
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355 """ |
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356 if len(repo): |
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357 raise error.Abort(_('cannot apply stream clone bundle on non-empty ' |
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358 'repo')) |
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359 |
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360 compression = fp.read(2) |
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361 if compression != 'UN': |
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362 raise error.Abort(_('only uncompressed stream clone bundles are ' |
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363 'supported; got %s') % compression) |
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364 |
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365 filecount, bytecount = struct.unpack('>QQ', fp.read(16)) |
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366 requireslen = struct.unpack('>H', fp.read(2))[0] |
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367 requires = fp.read(requireslen) |
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368 |
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369 if not requires.endswith('\0'): |
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370 raise error.Abort(_('malformed stream clone bundle: ' |
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371 'requirements not properly encoded')) |
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372 |
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373 requirements = set(requires.rstrip('\0').split(',')) |
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374 missingreqs = requirements - repo.supportedformats |
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375 if missingreqs: |
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376 raise error.Abort(_('unable to apply stream clone: ' |
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377 'unsupported format: %s') % |
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378 ', '.join(sorted(missingreqs))) |
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379 |
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380 consumev1(repo, fp, filecount, bytecount) |
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381 |
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382 class streamcloneapplier(object): |
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383 """Class to manage applying streaming clone bundles. |
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384 |
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385 We need to wrap ``applybundlev1()`` in a dedicated type to enable bundle |
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386 readers to perform bundle type-specific functionality. |
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387 """ |
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388 def __init__(self, fh): |
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389 self._fh = fh |
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390 |
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391 def apply(self, repo): |
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392 return applybundlev1(repo, self._fh) |