Mercurial > hg
annotate mercurial/streamclone.py @ 26478:a3f7e5461dbd
util.chunkbuffer: special case reading everything
The new code results in simpler logic within the while loop. It is also
faster since we avoid performing operations on the queue and buf
collections. However, there shouldn't be any super hot loops for this
since the whole point of chunkbuffer is to avoid reading large amounts
of data at once. This does, however, make it easier to optimize
chunkbuffer in a subsequent patch.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 05 Oct 2015 16:28:12 -0700 |
parents | 4b5647d9ee13 |
children | 56b2bcea2529 |
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 time |
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11 |
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12 from .i18n import _ |
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13 from . import ( |
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14 branchmap, |
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15 error, |
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16 store, |
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17 util, |
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18 ) |
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19 |
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20 def canperformstreamclone(pullop, bailifbundle2supported=False): |
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21 """Whether it is possible to perform a streaming clone as part of pull. |
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22 |
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23 ``bailifbundle2supported`` will cause the function to return False if |
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24 bundle2 stream clones are supported. It should only be called by the |
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25 legacy stream clone code path. |
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26 |
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27 Returns a tuple of (supported, requirements). ``supported`` is True if |
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28 streaming clone is supported and False otherwise. ``requirements`` is |
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29 a set of repo requirements from the remote, or ``None`` if stream clone |
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30 isn't supported. |
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31 """ |
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32 repo = pullop.repo |
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33 remote = pullop.remote |
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34 |
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35 bundle2supported = False |
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36 if pullop.canusebundle2: |
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37 if 'v1' in pullop.remotebundle2caps.get('stream', []): |
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38 bundle2supported = True |
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39 # else |
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40 # Server doesn't support bundle2 stream clone or doesn't support |
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41 # the versions we support. Fall back and possibly allow legacy. |
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42 |
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43 # Ensures legacy code path uses available bundle2. |
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44 if bailifbundle2supported and bundle2supported: |
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45 return False, None |
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46 # Ensures bundle2 doesn't try to do a stream clone if it isn't supported. |
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47 #elif not bailifbundle2supported and not bundle2supported: |
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48 # return False, None |
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49 |
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50 # Streaming clone only works on empty repositories. |
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51 if len(repo): |
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52 return False, None |
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53 |
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54 # Streaming clone only works if all data is being requested. |
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55 if pullop.heads: |
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56 return False, None |
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57 |
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58 streamrequested = pullop.streamclonerequested |
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59 |
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60 # If we don't have a preference, let the server decide for us. This |
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61 # likely only comes into play in LANs. |
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62 if streamrequested is None: |
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63 # The server can advertise whether to prefer streaming clone. |
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64 streamrequested = remote.capable('stream-preferred') |
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65 |
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66 if not streamrequested: |
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67 return False, None |
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68 |
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69 # In order for stream clone to work, the client has to support all the |
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70 # requirements advertised by the server. |
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71 # |
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72 # The server advertises its requirements via the "stream" and "streamreqs" |
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73 # capability. "stream" (a value-less capability) is advertised if and only |
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74 # if the only requirement is "revlogv1." Else, the "streamreqs" capability |
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75 # is advertised and contains a comma-delimited list of requirements. |
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76 requirements = set() |
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77 if remote.capable('stream'): |
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78 requirements.add('revlogv1') |
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79 else: |
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80 streamreqs = remote.capable('streamreqs') |
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81 # This is weird and shouldn't happen with modern servers. |
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82 if not streamreqs: |
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83 return False, None |
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84 |
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85 streamreqs = set(streamreqs.split(',')) |
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86 # Server requires something we don't support. Bail. |
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87 if streamreqs - repo.supportedformats: |
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88 return False, None |
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89 requirements = streamreqs |
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90 |
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91 return True, requirements |
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92 |
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93 def maybeperformlegacystreamclone(pullop): |
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94 """Possibly perform a legacy stream clone operation. |
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95 |
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96 Legacy stream clones are performed as part of pull but before all other |
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97 operations. |
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98 |
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99 A legacy stream clone will not be performed if a bundle2 stream clone is |
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100 supported. |
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101 """ |
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102 supported, requirements = canperformstreamclone(pullop) |
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103 |
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104 if not supported: |
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105 return |
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106 |
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107 repo = pullop.repo |
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108 remote = pullop.remote |
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109 |
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110 # Save remote branchmap. We will use it later to speed up branchcache |
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111 # creation. |
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112 rbranchmap = None |
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113 if remote.capable('branchmap'): |
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114 rbranchmap = remote.branchmap() |
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115 |
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116 repo.ui.status(_('streaming all changes\n')) |
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117 |
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118 fp = remote.stream_out() |
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119 l = fp.readline() |
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120 try: |
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121 resp = int(l) |
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122 except ValueError: |
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123 raise error.ResponseError( |
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124 _('unexpected response from remote server:'), l) |
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125 if resp == 1: |
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126 raise util.Abort(_('operation forbidden by server')) |
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127 elif resp == 2: |
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128 raise util.Abort(_('locking the remote repository failed')) |
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129 elif resp != 0: |
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130 raise util.Abort(_('the server sent an unknown error code')) |
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131 |
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132 l = fp.readline() |
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133 try: |
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134 filecount, bytecount = map(int, l.split(' ', 1)) |
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135 except (ValueError, TypeError): |
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136 raise error.ResponseError( |
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137 _('unexpected response from remote server:'), l) |
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138 |
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139 lock = repo.lock() |
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140 try: |
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141 consumev1(repo, fp, filecount, bytecount) |
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142 |
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143 # new requirements = old non-format requirements + |
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144 # new format-related remote requirements |
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145 # requirements from the streamed-in repository |
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146 repo.requirements = requirements | ( |
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147 repo.requirements - repo.supportedformats) |
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148 repo._applyopenerreqs() |
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149 repo._writerequirements() |
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150 |
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151 if rbranchmap: |
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152 branchmap.replacecache(repo, rbranchmap) |
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153 |
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154 repo.invalidate() |
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155 finally: |
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156 lock.release() |
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157 |
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158 def allowservergeneration(ui): |
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159 """Whether streaming clones are allowed from the server.""" |
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160 return ui.configbool('server', 'uncompressed', True, untrusted=True) |
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161 |
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162 # This is it's own function so extensions can override it. |
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163 def _walkstreamfiles(repo): |
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164 return repo.store.walk() |
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165 |
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166 def generatev1(repo): |
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167 """Emit content for version 1 of a streaming clone. |
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168 |
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169 This returns a 3-tuple of (file count, byte size, data iterator). |
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170 |
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171 The data iterator consists of N entries for each file being transferred. |
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172 Each file entry starts as a line with the file name and integer size |
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173 delimited by a null byte. |
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174 |
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175 The raw file data follows. Following the raw file data is the next file |
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176 entry, or EOF. |
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177 |
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178 When used on the wire protocol, an additional line indicating protocol |
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179 success will be prepended to the stream. This function is not responsible |
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180 for adding it. |
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181 |
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182 This function will obtain a repository lock to ensure a consistent view of |
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183 the store is captured. It therefore may raise LockError. |
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184 """ |
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185 entries = [] |
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186 total_bytes = 0 |
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187 # Get consistent snapshot of repo, lock during scan. |
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188 lock = repo.lock() |
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189 try: |
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190 repo.ui.debug('scanning\n') |
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191 for name, ename, size in _walkstreamfiles(repo): |
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192 if size: |
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193 entries.append((name, size)) |
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194 total_bytes += size |
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195 finally: |
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196 lock.release() |
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197 |
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198 repo.ui.debug('%d files, %d bytes to transfer\n' % |
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199 (len(entries), total_bytes)) |
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200 |
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201 svfs = repo.svfs |
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202 oldaudit = svfs.mustaudit |
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203 debugflag = repo.ui.debugflag |
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204 svfs.mustaudit = False |
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205 |
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206 def emitrevlogdata(): |
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207 try: |
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208 for name, size in entries: |
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209 if debugflag: |
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210 repo.ui.debug('sending %s (%d bytes)\n' % (name, size)) |
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211 # partially encode name over the wire for backwards compat |
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212 yield '%s\0%d\n' % (store.encodedir(name), size) |
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213 if size <= 65536: |
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214 fp = svfs(name) |
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215 try: |
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216 data = fp.read(size) |
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217 finally: |
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218 fp.close() |
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219 yield data |
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220 else: |
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221 for chunk in util.filechunkiter(svfs(name), limit=size): |
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222 yield chunk |
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223 finally: |
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224 svfs.mustaudit = oldaudit |
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225 |
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226 return len(entries), total_bytes, emitrevlogdata() |
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227 |
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228 def generatev1wireproto(repo): |
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229 """Emit content for version 1 of streaming clone suitable for the wire. |
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230 |
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231 This is the data output from ``generatev1()`` with a header line |
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232 indicating file count and byte size. |
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233 """ |
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234 filecount, bytecount, it = generatev1(repo) |
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235 yield '%d %d\n' % (filecount, bytecount) |
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236 for chunk in it: |
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237 yield chunk |
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238 |
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239 def consumev1(repo, fp, filecount, bytecount): |
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240 """Apply the contents from version 1 of a streaming clone file handle. |
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241 |
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242 This takes the output from "streamout" and applies it to the specified |
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243 repository. |
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244 |
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245 Like "streamout," the status line added by the wire protocol is not handled |
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246 by this function. |
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247 """ |
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248 lock = repo.lock() |
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249 try: |
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250 repo.ui.status(_('%d files to transfer, %s of data\n') % |
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251 (filecount, util.bytecount(bytecount))) |
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252 handled_bytes = 0 |
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253 repo.ui.progress(_('clone'), 0, total=bytecount) |
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254 start = time.time() |
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255 |
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256 tr = repo.transaction(_('clone')) |
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257 try: |
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258 for i in xrange(filecount): |
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259 # XXX doesn't support '\n' or '\r' in filenames |
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260 l = fp.readline() |
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261 try: |
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262 name, size = l.split('\0', 1) |
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263 size = int(size) |
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264 except (ValueError, TypeError): |
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265 raise error.ResponseError( |
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266 _('unexpected response from remote server:'), l) |
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267 if repo.ui.debugflag: |
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268 repo.ui.debug('adding %s (%s)\n' % |
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269 (name, util.bytecount(size))) |
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270 # for backwards compat, name was partially encoded |
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271 ofp = repo.svfs(store.decodedir(name), 'w') |
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272 for chunk in util.filechunkiter(fp, limit=size): |
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273 handled_bytes += len(chunk) |
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274 repo.ui.progress(_('clone'), handled_bytes, total=bytecount) |
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275 ofp.write(chunk) |
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276 ofp.close() |
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277 tr.close() |
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278 finally: |
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279 tr.release() |
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280 |
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281 # Writing straight to files circumvented the inmemory caches |
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282 repo.invalidate() |
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283 |
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284 elapsed = time.time() - start |
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285 if elapsed <= 0: |
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286 elapsed = 0.001 |
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287 repo.ui.progress(_('clone'), None) |
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288 repo.ui.status(_('transferred %s in %.1f seconds (%s/sec)\n') % |
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289 (util.bytecount(bytecount), elapsed, |
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290 util.bytecount(bytecount / elapsed))) |
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291 finally: |
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292 lock.release() |