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1 # fileserverclient.py - client for communicating with the cache process |
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2 # |
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3 # Copyright 2013 Facebook, Inc. |
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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 hashlib |
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11 import io |
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12 import os |
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13 import struct |
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14 import threading |
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15 import time |
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16 |
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17 from mercurial.i18n import _ |
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18 from mercurial.node import bin, hex, nullid |
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19 from mercurial import ( |
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20 error, |
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21 revlog, |
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22 sshpeer, |
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23 util, |
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24 wireprotov1peer, |
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25 ) |
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26 from mercurial.utils import procutil |
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27 |
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28 from . import ( |
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29 constants, |
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30 contentstore, |
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31 lz4wrapper, |
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32 metadatastore, |
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33 shallowutil, |
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34 wirepack, |
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35 ) |
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36 |
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37 _sshv1peer = sshpeer.sshv1peer |
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38 |
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39 # Statistics for debugging |
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40 fetchcost = 0 |
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41 fetches = 0 |
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42 fetched = 0 |
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43 fetchmisses = 0 |
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44 |
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45 _lfsmod = None |
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46 _downloading = _('downloading') |
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47 |
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48 def getcachekey(reponame, file, id): |
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49 pathhash = hashlib.sha1(file).hexdigest() |
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50 return os.path.join(reponame, pathhash[:2], pathhash[2:], id) |
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51 |
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52 def getlocalkey(file, id): |
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53 pathhash = hashlib.sha1(file).hexdigest() |
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54 return os.path.join(pathhash, id) |
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55 |
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56 def peersetup(ui, peer): |
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57 |
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58 class remotefilepeer(peer.__class__): |
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59 @wireprotov1peer.batchable |
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60 def getfile(self, file, node): |
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61 if not self.capable('getfile'): |
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62 raise error.Abort( |
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63 'configured remotefile server does not support getfile') |
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64 f = wireprotov1peer.future() |
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65 yield {'file': file, 'node': node}, f |
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66 code, data = f.value.split('\0', 1) |
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67 if int(code): |
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68 raise error.LookupError(file, node, data) |
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69 yield data |
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70 |
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71 @wireprotov1peer.batchable |
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72 def getflogheads(self, path): |
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73 if not self.capable('getflogheads'): |
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74 raise error.Abort('configured remotefile server does not ' |
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75 'support getflogheads') |
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76 f = wireprotov1peer.future() |
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77 yield {'path': path}, f |
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78 heads = f.value.split('\n') if f.value else [] |
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79 yield heads |
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80 |
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81 def _updatecallstreamopts(self, command, opts): |
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82 if command != 'getbundle': |
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83 return |
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84 if 'remotefilelog' not in self.capabilities(): |
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85 return |
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86 if not util.safehasattr(self, '_localrepo'): |
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87 return |
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88 if constants.REQUIREMENT not in self._localrepo.requirements: |
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89 return |
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90 |
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91 bundlecaps = opts.get('bundlecaps') |
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92 if bundlecaps: |
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93 bundlecaps = [bundlecaps] |
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94 else: |
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95 bundlecaps = [] |
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96 |
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97 # shallow, includepattern, and excludepattern are a hacky way of |
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98 # carrying over data from the local repo to this getbundle |
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99 # command. We need to do it this way because bundle1 getbundle |
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100 # doesn't provide any other place we can hook in to manipulate |
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101 # getbundle args before it goes across the wire. Once we get rid |
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102 # of bundle1, we can use bundle2's _pullbundle2extraprepare to |
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103 # do this more cleanly. |
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104 bundlecaps.append('remotefilelog') |
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105 if self._localrepo.includepattern: |
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106 patterns = '\0'.join(self._localrepo.includepattern) |
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107 includecap = "includepattern=" + patterns |
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108 bundlecaps.append(includecap) |
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109 if self._localrepo.excludepattern: |
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110 patterns = '\0'.join(self._localrepo.excludepattern) |
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111 excludecap = "excludepattern=" + patterns |
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112 bundlecaps.append(excludecap) |
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113 opts['bundlecaps'] = ','.join(bundlecaps) |
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114 |
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115 def _sendrequest(self, command, args, **opts): |
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116 self._updatecallstreamopts(command, args) |
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117 return super(remotefilepeer, self)._sendrequest(command, args, |
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118 **opts) |
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119 |
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120 def _callstream(self, command, **opts): |
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121 supertype = super(remotefilepeer, self) |
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122 if not util.safehasattr(supertype, '_sendrequest'): |
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123 self._updatecallstreamopts(command, opts) |
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124 return super(remotefilepeer, self)._callstream(command, **opts) |
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125 |
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126 peer.__class__ = remotefilepeer |
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127 |
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128 class cacheconnection(object): |
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129 """The connection for communicating with the remote cache. Performs |
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130 gets and sets by communicating with an external process that has the |
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131 cache-specific implementation. |
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132 """ |
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133 def __init__(self): |
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134 self.pipeo = self.pipei = self.pipee = None |
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135 self.subprocess = None |
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136 self.connected = False |
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137 |
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138 def connect(self, cachecommand): |
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139 if self.pipeo: |
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140 raise error.Abort(_("cache connection already open")) |
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141 self.pipei, self.pipeo, self.pipee, self.subprocess = \ |
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142 procutil.popen4(cachecommand) |
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143 self.connected = True |
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144 |
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145 def close(self): |
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146 def tryclose(pipe): |
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147 try: |
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148 pipe.close() |
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149 except Exception: |
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150 pass |
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151 if self.connected: |
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152 try: |
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153 self.pipei.write("exit\n") |
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154 except Exception: |
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155 pass |
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156 tryclose(self.pipei) |
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157 self.pipei = None |
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158 tryclose(self.pipeo) |
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159 self.pipeo = None |
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160 tryclose(self.pipee) |
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161 self.pipee = None |
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162 try: |
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163 # Wait for process to terminate, making sure to avoid deadlock. |
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164 # See https://docs.python.org/2/library/subprocess.html for |
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165 # warnings about wait() and deadlocking. |
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166 self.subprocess.communicate() |
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167 except Exception: |
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168 pass |
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169 self.subprocess = None |
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170 self.connected = False |
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171 |
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172 def request(self, request, flush=True): |
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173 if self.connected: |
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174 try: |
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175 self.pipei.write(request) |
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176 if flush: |
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177 self.pipei.flush() |
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178 except IOError: |
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179 self.close() |
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180 |
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181 def receiveline(self): |
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182 if not self.connected: |
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183 return None |
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184 try: |
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185 result = self.pipeo.readline()[:-1] |
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186 if not result: |
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187 self.close() |
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188 except IOError: |
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189 self.close() |
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190 |
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191 return result |
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192 |
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193 def _getfilesbatch( |
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194 remote, receivemissing, progresstick, missed, idmap, batchsize): |
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195 # Over http(s), iterbatch is a streamy method and we can start |
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196 # looking at results early. This means we send one (potentially |
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197 # large) request, but then we show nice progress as we process |
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198 # file results, rather than showing chunks of $batchsize in |
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199 # progress. |
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200 # |
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201 # Over ssh, iterbatch isn't streamy because batch() wasn't |
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202 # explicitly designed as a streaming method. In the future we |
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203 # should probably introduce a streambatch() method upstream and |
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204 # use that for this. |
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205 with remote.commandexecutor() as e: |
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206 futures = [] |
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207 for m in missed: |
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208 futures.append(e.callcommand('getfile', { |
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209 'file': idmap[m], |
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210 'node': m[-40:] |
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211 })) |
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212 |
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213 for i, m in enumerate(missed): |
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214 r = futures[i].result() |
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215 futures[i] = None # release memory |
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216 file_ = idmap[m] |
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217 node = m[-40:] |
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218 receivemissing(io.BytesIO('%d\n%s' % (len(r), r)), file_, node) |
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219 progresstick() |
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220 |
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221 def _getfiles_optimistic( |
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222 remote, receivemissing, progresstick, missed, idmap, step): |
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223 remote._callstream("getfiles") |
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224 i = 0 |
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225 pipeo = remote._pipeo |
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226 pipei = remote._pipei |
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227 while i < len(missed): |
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228 # issue a batch of requests |
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229 start = i |
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230 end = min(len(missed), start + step) |
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231 i = end |
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232 for missingid in missed[start:end]: |
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233 # issue new request |
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234 versionid = missingid[-40:] |
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235 file = idmap[missingid] |
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236 sshrequest = "%s%s\n" % (versionid, file) |
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237 pipeo.write(sshrequest) |
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238 pipeo.flush() |
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239 |
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240 # receive batch results |
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241 for missingid in missed[start:end]: |
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242 versionid = missingid[-40:] |
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243 file = idmap[missingid] |
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244 receivemissing(pipei, file, versionid) |
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245 progresstick() |
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246 |
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247 # End the command |
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248 pipeo.write('\n') |
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249 pipeo.flush() |
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250 |
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251 def _getfiles_threaded( |
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252 remote, receivemissing, progresstick, missed, idmap, step): |
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253 remote._callstream("getfiles") |
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254 pipeo = remote._pipeo |
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255 pipei = remote._pipei |
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256 |
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257 def writer(): |
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258 for missingid in missed: |
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259 versionid = missingid[-40:] |
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260 file = idmap[missingid] |
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261 sshrequest = "%s%s\n" % (versionid, file) |
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262 pipeo.write(sshrequest) |
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263 pipeo.flush() |
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264 writerthread = threading.Thread(target=writer) |
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265 writerthread.daemon = True |
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266 writerthread.start() |
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267 |
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268 for missingid in missed: |
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269 versionid = missingid[-40:] |
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270 file = idmap[missingid] |
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271 receivemissing(pipei, file, versionid) |
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272 progresstick() |
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273 |
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274 writerthread.join() |
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275 # End the command |
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276 pipeo.write('\n') |
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277 pipeo.flush() |
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278 |
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279 class fileserverclient(object): |
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280 """A client for requesting files from the remote file server. |
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281 """ |
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282 def __init__(self, repo): |
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283 ui = repo.ui |
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284 self.repo = repo |
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285 self.ui = ui |
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286 self.cacheprocess = ui.config("remotefilelog", "cacheprocess") |
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287 if self.cacheprocess: |
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288 self.cacheprocess = util.expandpath(self.cacheprocess) |
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289 |
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290 # This option causes remotefilelog to pass the full file path to the |
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291 # cacheprocess instead of a hashed key. |
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292 self.cacheprocesspasspath = ui.configbool( |
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293 "remotefilelog", "cacheprocess.includepath") |
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294 |
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295 self.debugoutput = ui.configbool("remotefilelog", "debug") |
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296 |
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297 self.remotecache = cacheconnection() |
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298 |
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299 def setstore(self, datastore, historystore, writedata, writehistory): |
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300 self.datastore = datastore |
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301 self.historystore = historystore |
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302 self.writedata = writedata |
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303 self.writehistory = writehistory |
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304 |
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305 def _connect(self): |
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306 return self.repo.connectionpool.get(self.repo.fallbackpath) |
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307 |
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308 def request(self, fileids): |
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309 """Takes a list of filename/node pairs and fetches them from the |
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310 server. Files are stored in the local cache. |
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311 A list of nodes that the server couldn't find is returned. |
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312 If the connection fails, an exception is raised. |
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313 """ |
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314 if not self.remotecache.connected: |
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315 self.connect() |
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316 cache = self.remotecache |
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317 writedata = self.writedata |
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318 |
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319 if self.ui.configbool('remotefilelog', 'fetchpacks'): |
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320 self.requestpack(fileids) |
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321 return |
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322 |
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323 repo = self.repo |
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324 count = len(fileids) |
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325 request = "get\n%d\n" % count |
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326 idmap = {} |
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327 reponame = repo.name |
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328 for file, id in fileids: |
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329 fullid = getcachekey(reponame, file, id) |
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330 if self.cacheprocesspasspath: |
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331 request += file + '\0' |
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332 request += fullid + "\n" |
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333 idmap[fullid] = file |
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334 |
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335 cache.request(request) |
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336 |
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337 total = count |
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338 self.ui.progress(_downloading, 0, total=count) |
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339 |
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340 missed = [] |
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341 count = 0 |
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342 while True: |
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343 missingid = cache.receiveline() |
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344 if not missingid: |
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345 missedset = set(missed) |
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346 for missingid in idmap.iterkeys(): |
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347 if not missingid in missedset: |
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348 missed.append(missingid) |
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349 self.ui.warn(_("warning: cache connection closed early - " + |
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350 "falling back to server\n")) |
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351 break |
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352 if missingid == "0": |
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353 break |
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354 if missingid.startswith("_hits_"): |
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355 # receive progress reports |
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356 parts = missingid.split("_") |
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357 count += int(parts[2]) |
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358 self.ui.progress(_downloading, count, total=total) |
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359 continue |
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360 |
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361 missed.append(missingid) |
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362 |
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363 global fetchmisses |
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364 fetchmisses += len(missed) |
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365 |
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366 count = [total - len(missed)] |
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367 fromcache = count[0] |
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368 self.ui.progress(_downloading, count[0], total=total) |
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369 self.ui.log("remotefilelog", "remote cache hit rate is %r of %r\n", |
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370 count[0], total, hit=count[0], total=total) |
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371 |
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372 oldumask = os.umask(0o002) |
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373 try: |
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374 # receive cache misses from master |
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375 if missed: |
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376 def progresstick(): |
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377 count[0] += 1 |
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378 self.ui.progress(_downloading, count[0], total=total) |
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379 # When verbose is true, sshpeer prints 'running ssh...' |
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380 # to stdout, which can interfere with some command |
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381 # outputs |
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382 verbose = self.ui.verbose |
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383 self.ui.verbose = False |
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384 try: |
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385 with self._connect() as conn: |
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386 remote = conn.peer |
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387 # TODO: deduplicate this with the constant in |
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388 # shallowrepo |
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389 if remote.capable("remotefilelog"): |
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390 if not isinstance(remote, _sshv1peer): |
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391 raise error.Abort('remotefilelog requires ssh ' |
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392 'servers') |
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393 step = self.ui.configint('remotefilelog', |
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394 'getfilesstep') |
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395 getfilestype = self.ui.config('remotefilelog', |
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396 'getfilestype') |
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397 if getfilestype == 'threaded': |
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398 _getfiles = _getfiles_threaded |
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399 else: |
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400 _getfiles = _getfiles_optimistic |
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401 _getfiles(remote, self.receivemissing, progresstick, |
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402 missed, idmap, step) |
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403 elif remote.capable("getfile"): |
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404 if remote.capable('batch'): |
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405 batchdefault = 100 |
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406 else: |
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407 batchdefault = 10 |
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408 batchsize = self.ui.configint( |
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409 'remotefilelog', 'batchsize', batchdefault) |
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410 _getfilesbatch( |
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411 remote, self.receivemissing, progresstick, |
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412 missed, idmap, batchsize) |
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413 else: |
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414 raise error.Abort("configured remotefilelog server" |
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415 " does not support remotefilelog") |
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416 |
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417 self.ui.log("remotefilefetchlog", |
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418 "Success\n", |
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419 fetched_files = count[0] - fromcache, |
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420 total_to_fetch = total - fromcache) |
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421 except Exception: |
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422 self.ui.log("remotefilefetchlog", |
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423 "Fail\n", |
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424 fetched_files = count[0] - fromcache, |
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425 total_to_fetch = total - fromcache) |
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426 raise |
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427 finally: |
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428 self.ui.verbose = verbose |
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429 # send to memcache |
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430 count[0] = len(missed) |
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431 request = "set\n%d\n%s\n" % (count[0], "\n".join(missed)) |
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432 cache.request(request) |
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433 |
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434 self.ui.progress(_downloading, None) |
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435 |
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436 # mark ourselves as a user of this cache |
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437 writedata.markrepo(self.repo.path) |
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438 finally: |
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439 os.umask(oldumask) |
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440 |
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441 def receivemissing(self, pipe, filename, node): |
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442 line = pipe.readline()[:-1] |
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443 if not line: |
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444 raise error.ResponseError(_("error downloading file contents:"), |
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445 _("connection closed early")) |
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446 size = int(line) |
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447 data = pipe.read(size) |
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448 if len(data) != size: |
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449 raise error.ResponseError(_("error downloading file contents:"), |
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450 _("only received %s of %s bytes") |
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451 % (len(data), size)) |
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452 |
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453 self.writedata.addremotefilelognode(filename, bin(node), |
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454 lz4wrapper.lz4decompress(data)) |
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455 |
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456 def requestpack(self, fileids): |
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457 """Requests the given file revisions from the server in a pack format. |
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458 |
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459 See `remotefilelogserver.getpack` for the file format. |
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460 """ |
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461 try: |
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462 with self._connect() as conn: |
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463 total = len(fileids) |
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464 rcvd = 0 |
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465 |
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466 remote = conn.peer |
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467 remote._callstream("getpackv1") |
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468 |
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469 self._sendpackrequest(remote, fileids) |
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470 |
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471 packpath = shallowutil.getcachepackpath( |
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472 self.repo, constants.FILEPACK_CATEGORY) |
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473 pipei = remote._pipei |
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474 receiveddata, receivedhistory = wirepack.receivepack( |
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475 self.repo.ui, pipei, packpath) |
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476 rcvd = len(receiveddata) |
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477 |
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478 self.ui.log("remotefilefetchlog", |
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479 "Success(pack)\n" if (rcvd==total) else "Fail(pack)\n", |
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480 fetched_files = rcvd, |
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481 total_to_fetch = total) |
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482 except Exception: |
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483 self.ui.log("remotefilefetchlog", |
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484 "Fail(pack)\n", |
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485 fetched_files = rcvd, |
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486 total_to_fetch = total) |
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487 raise |
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488 |
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489 def _sendpackrequest(self, remote, fileids): |
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490 """Formats and writes the given fileids to the remote as part of a |
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491 getpackv1 call. |
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492 """ |
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493 # Sort the requests by name, so we receive requests in batches by name |
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494 grouped = {} |
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495 for filename, node in fileids: |
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496 grouped.setdefault(filename, set()).add(node) |
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497 |
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498 # Issue request |
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499 pipeo = remote._pipeo |
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500 for filename, nodes in grouped.iteritems(): |
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501 filenamelen = struct.pack(constants.FILENAMESTRUCT, len(filename)) |
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502 countlen = struct.pack(constants.PACKREQUESTCOUNTSTRUCT, len(nodes)) |
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503 rawnodes = ''.join(bin(n) for n in nodes) |
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504 |
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505 pipeo.write('%s%s%s%s' % (filenamelen, filename, countlen, |
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506 rawnodes)) |
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507 pipeo.flush() |
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508 pipeo.write(struct.pack(constants.FILENAMESTRUCT, 0)) |
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509 pipeo.flush() |
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510 |
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511 def connect(self): |
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512 if self.cacheprocess: |
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513 cmd = "%s %s" % (self.cacheprocess, self.writedata._path) |
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514 self.remotecache.connect(cmd) |
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515 else: |
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516 # If no cache process is specified, we fake one that always |
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517 # returns cache misses. This enables tests to run easily |
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518 # and may eventually allow us to be a drop in replacement |
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519 # for the largefiles extension. |
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520 class simplecache(object): |
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521 def __init__(self): |
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522 self.missingids = [] |
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523 self.connected = True |
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524 |
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525 def close(self): |
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526 pass |
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527 |
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528 def request(self, value, flush=True): |
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529 lines = value.split("\n") |
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530 if lines[0] != "get": |
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531 return |
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532 self.missingids = lines[2:-1] |
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533 self.missingids.append('0') |
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534 |
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535 def receiveline(self): |
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536 if len(self.missingids) > 0: |
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537 return self.missingids.pop(0) |
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538 return None |
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539 |
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540 self.remotecache = simplecache() |
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541 |
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542 def close(self): |
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543 if fetches: |
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544 msg = ("%s files fetched over %d fetches - " + |
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545 "(%d misses, %0.2f%% hit ratio) over %0.2fs\n") % ( |
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546 fetched, |
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547 fetches, |
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548 fetchmisses, |
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549 float(fetched - fetchmisses) / float(fetched) * 100.0, |
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550 fetchcost) |
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551 if self.debugoutput: |
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552 self.ui.warn(msg) |
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553 self.ui.log("remotefilelog.prefetch", msg.replace("%", "%%"), |
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554 remotefilelogfetched=fetched, |
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555 remotefilelogfetches=fetches, |
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556 remotefilelogfetchmisses=fetchmisses, |
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557 remotefilelogfetchtime=fetchcost * 1000) |
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558 |
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559 if self.remotecache.connected: |
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560 self.remotecache.close() |
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561 |
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562 def prefetch(self, fileids, force=False, fetchdata=True, |
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563 fetchhistory=False): |
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564 """downloads the given file versions to the cache |
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565 """ |
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566 repo = self.repo |
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567 idstocheck = [] |
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568 for file, id in fileids: |
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569 # hack |
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570 # - we don't use .hgtags |
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571 # - workingctx produces ids with length 42, |
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572 # which we skip since they aren't in any cache |
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573 if (file == '.hgtags' or len(id) == 42 |
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574 or not repo.shallowmatch(file)): |
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575 continue |
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576 |
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577 idstocheck.append((file, bin(id))) |
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578 |
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579 datastore = self.datastore |
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580 historystore = self.historystore |
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581 if force: |
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582 datastore = contentstore.unioncontentstore(*repo.shareddatastores) |
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583 historystore = metadatastore.unionmetadatastore( |
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584 *repo.sharedhistorystores) |
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585 |
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586 missingids = set() |
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587 if fetchdata: |
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588 missingids.update(datastore.getmissing(idstocheck)) |
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589 if fetchhistory: |
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590 missingids.update(historystore.getmissing(idstocheck)) |
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591 |
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592 # partition missing nodes into nullid and not-nullid so we can |
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593 # warn about this filtering potentially shadowing bugs. |
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594 nullids = len([None for unused, id in missingids if id == nullid]) |
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595 if nullids: |
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596 missingids = [(f, id) for f, id in missingids if id != nullid] |
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597 repo.ui.develwarn( |
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598 ('remotefilelog not fetching %d null revs' |
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599 ' - this is likely hiding bugs' % nullids), |
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600 config='remotefilelog-ext') |
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601 if missingids: |
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602 global fetches, fetched, fetchcost |
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603 fetches += 1 |
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604 |
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605 # We want to be able to detect excess individual file downloads, so |
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606 # let's log that information for debugging. |
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607 if fetches >= 15 and fetches < 18: |
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608 if fetches == 15: |
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609 fetchwarning = self.ui.config('remotefilelog', |
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610 'fetchwarning') |
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611 if fetchwarning: |
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612 self.ui.warn(fetchwarning + '\n') |
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613 self.logstacktrace() |
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614 missingids = [(file, hex(id)) for file, id in missingids] |
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615 fetched += len(missingids) |
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616 start = time.time() |
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617 missingids = self.request(missingids) |
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618 if missingids: |
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619 raise error.Abort(_("unable to download %d files") % |
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620 len(missingids)) |
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621 fetchcost += time.time() - start |
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622 self._lfsprefetch(fileids) |
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623 |
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624 def _lfsprefetch(self, fileids): |
|
625 if not _lfsmod or not util.safehasattr( |
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626 self.repo.svfs, 'lfslocalblobstore'): |
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627 return |
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628 if not _lfsmod.wrapper.candownload(self.repo): |
|
629 return |
|
630 pointers = [] |
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631 store = self.repo.svfs.lfslocalblobstore |
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632 for file, id in fileids: |
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633 node = bin(id) |
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634 rlog = self.repo.file(file) |
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635 if rlog.flags(node) & revlog.REVIDX_EXTSTORED: |
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636 text = rlog.revision(node, raw=True) |
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637 p = _lfsmod.pointer.deserialize(text) |
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638 oid = p.oid() |
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639 if not store.has(oid): |
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640 pointers.append(p) |
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641 if len(pointers) > 0: |
|
642 self.repo.svfs.lfsremoteblobstore.readbatch(pointers, store) |
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643 assert all(store.has(p.oid()) for p in pointers) |
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644 |
|
645 def logstacktrace(self): |
|
646 import traceback |
|
647 self.ui.log('remotefilelog', 'excess remotefilelog fetching:\n%s\n', |
|
648 ''.join(traceback.format_stack())) |