Mercurial > hg
annotate mercurial/repository.py @ 35935:00b9e26d727b
sshpeer: establish SSH connection before class instantiation
We want to move the handshake to before peers are created so
we can instantiate a different peer class depending on the
results of the handshake. This necessitates moving the SSH
process invocation to outside the peer class.
As part of the code move, some variables were renamed for
clarity. util.popen4() returns stdin, stdout, and stderr in
their typical file descriptor order. However, stdin and stdout
were being mapped to "pipeo" and "pipei" respectively. "o"
for "stdin" and "i" for "stdout" is a bit confusing. Although
it does make sense for "output" and "input" from the perspective
of the client. But in the context of the new function, it makes
sense to refer to these as their file descriptor names.
In addition, the last use of self._path disappeared, so we stop
setting that attribute and we can delete the redundant URL
parsing necessary to set it.
Differential Revision: https://phab.mercurial-scm.org/D2031
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 05 Feb 2018 14:05:59 -0800 |
parents | a0aad86b3b6a |
children | 0dfb5672f015 |
rev | line source |
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1 # repository.py - Interfaces and base classes for repositories and peers. |
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2 # |
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3 # Copyright 2017 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 abc |
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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 error, |
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15 ) |
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16 |
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17 class _basepeer(object): |
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18 """Represents a "connection" to a repository. |
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19 |
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20 This is the base interface for representing a connection to a repository. |
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21 It holds basic properties and methods applicable to all peer types. |
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22 |
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23 This is not a complete interface definition and should not be used |
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24 outside of this module. |
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25 """ |
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26 __metaclass__ = abc.ABCMeta |
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27 |
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28 @abc.abstractproperty |
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29 def ui(self): |
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30 """ui.ui instance.""" |
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31 |
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32 @abc.abstractmethod |
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33 def url(self): |
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34 """Returns a URL string representing this peer. |
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35 |
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36 Currently, implementations expose the raw URL used to construct the |
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37 instance. It may contain credentials as part of the URL. The |
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38 expectations of the value aren't well-defined and this could lead to |
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39 data leakage. |
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40 |
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41 TODO audit/clean consumers and more clearly define the contents of this |
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42 value. |
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43 """ |
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44 |
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45 @abc.abstractmethod |
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46 def local(self): |
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47 """Returns a local repository instance. |
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48 |
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49 If the peer represents a local repository, returns an object that |
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50 can be used to interface with it. Otherwise returns ``None``. |
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51 """ |
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52 |
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53 @abc.abstractmethod |
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54 def peer(self): |
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55 """Returns an object conforming to this interface. |
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56 |
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57 Most implementations will ``return self``. |
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58 """ |
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59 |
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60 @abc.abstractmethod |
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61 def canpush(self): |
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62 """Returns a boolean indicating if this peer can be pushed to.""" |
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63 |
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64 @abc.abstractmethod |
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65 def close(self): |
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66 """Close the connection to this peer. |
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67 |
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68 This is called when the peer will no longer be used. Resources |
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69 associated with the peer should be cleaned up. |
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70 """ |
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71 |
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72 class _basewirecommands(object): |
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73 """Client-side interface for communicating over the wire protocol. |
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74 |
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75 This interface is used as a gateway to the Mercurial wire protocol. |
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76 methods commonly call wire protocol commands of the same name. |
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77 """ |
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78 __metaclass__ = abc.ABCMeta |
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79 |
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80 @abc.abstractmethod |
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81 def branchmap(self): |
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82 """Obtain heads in named branches. |
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83 |
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84 Returns a dict mapping branch name to an iterable of nodes that are |
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85 heads on that branch. |
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86 """ |
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87 |
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88 @abc.abstractmethod |
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89 def capabilities(self): |
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90 """Obtain capabilities of the peer. |
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91 |
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92 Returns a set of string capabilities. |
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93 """ |
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94 |
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95 @abc.abstractmethod |
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96 def debugwireargs(self, one, two, three=None, four=None, five=None): |
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97 """Used to facilitate debugging of arguments passed over the wire.""" |
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98 |
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99 @abc.abstractmethod |
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100 def getbundle(self, source, **kwargs): |
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101 """Obtain remote repository data as a bundle. |
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102 |
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103 This command is how the bulk of repository data is transferred from |
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104 the peer to the local repository |
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105 |
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106 Returns a generator of bundle data. |
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107 """ |
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108 |
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109 @abc.abstractmethod |
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110 def heads(self): |
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111 """Determine all known head revisions in the peer. |
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112 |
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113 Returns an iterable of binary nodes. |
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114 """ |
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115 |
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116 @abc.abstractmethod |
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117 def known(self, nodes): |
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118 """Determine whether multiple nodes are known. |
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119 |
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120 Accepts an iterable of nodes whose presence to check for. |
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121 |
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122 Returns an iterable of booleans indicating of the corresponding node |
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123 at that index is known to the peer. |
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124 """ |
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125 |
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126 @abc.abstractmethod |
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127 def listkeys(self, namespace): |
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128 """Obtain all keys in a pushkey namespace. |
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129 |
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130 Returns an iterable of key names. |
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131 """ |
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132 |
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133 @abc.abstractmethod |
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134 def lookup(self, key): |
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135 """Resolve a value to a known revision. |
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136 |
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137 Returns a binary node of the resolved revision on success. |
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138 """ |
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139 |
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140 @abc.abstractmethod |
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141 def pushkey(self, namespace, key, old, new): |
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142 """Set a value using the ``pushkey`` protocol. |
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143 |
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144 Arguments correspond to the pushkey namespace and key to operate on and |
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145 the old and new values for that key. |
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146 |
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147 Returns a string with the peer result. The value inside varies by the |
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148 namespace. |
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149 """ |
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150 |
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151 @abc.abstractmethod |
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152 def stream_out(self): |
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153 """Obtain streaming clone data. |
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154 |
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155 Successful result should be a generator of data chunks. |
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156 """ |
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157 |
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158 @abc.abstractmethod |
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159 def unbundle(self, bundle, heads, url): |
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160 """Transfer repository data to the peer. |
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161 |
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162 This is how the bulk of data during a push is transferred. |
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163 |
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164 Returns the integer number of heads added to the peer. |
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165 """ |
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166 |
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167 class _baselegacywirecommands(object): |
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168 """Interface for implementing support for legacy wire protocol commands. |
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169 |
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170 Wire protocol commands transition to legacy status when they are no longer |
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171 used by modern clients. To facilitate identifying which commands are |
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172 legacy, the interfaces are split. |
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173 """ |
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174 __metaclass__ = abc.ABCMeta |
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175 |
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176 @abc.abstractmethod |
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177 def between(self, pairs): |
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178 """Obtain nodes between pairs of nodes. |
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179 |
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180 ``pairs`` is an iterable of node pairs. |
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181 |
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182 Returns an iterable of iterables of nodes corresponding to each |
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183 requested pair. |
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184 """ |
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185 |
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186 @abc.abstractmethod |
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187 def branches(self, nodes): |
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188 """Obtain ancestor changesets of specific nodes back to a branch point. |
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189 |
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190 For each requested node, the peer finds the first ancestor node that is |
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191 a DAG root or is a merge. |
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192 |
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193 Returns an iterable of iterables with the resolved values for each node. |
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194 """ |
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195 |
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196 @abc.abstractmethod |
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197 def changegroup(self, nodes, kind): |
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198 """Obtain a changegroup with data for descendants of specified nodes.""" |
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199 |
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200 @abc.abstractmethod |
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201 def changegroupsubset(self, bases, heads, kind): |
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202 pass |
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203 |
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204 class peer(_basepeer, _basewirecommands): |
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205 """Unified interface and base class for peer repositories. |
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206 |
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207 All peer instances must inherit from this class and conform to its |
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208 interface. |
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209 """ |
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210 |
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211 @abc.abstractmethod |
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212 def iterbatch(self): |
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213 """Obtain an object to be used for multiple method calls. |
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214 |
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215 Various operations call several methods on peer instances. If each |
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216 method call were performed immediately and serially, this would |
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217 require round trips to remote peers and/or would slow down execution. |
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218 |
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219 Some peers have the ability to "batch" method calls to avoid costly |
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220 round trips or to facilitate concurrent execution. |
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221 |
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222 This method returns an object that can be used to indicate intent to |
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223 perform batched method calls. |
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224 |
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225 The returned object is a proxy of this peer. It intercepts calls to |
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226 batchable methods and queues them instead of performing them |
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227 immediately. This proxy object has a ``submit`` method that will |
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228 perform all queued batchable method calls. A ``results()`` method |
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229 exposes the results of queued/batched method calls. It is a generator |
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230 of results in the order they were called. |
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231 |
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232 Not all peers or wire protocol implementations may actually batch method |
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233 calls. However, they must all support this API. |
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234 """ |
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235 |
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236 def capable(self, name): |
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237 """Determine support for a named capability. |
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238 |
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239 Returns ``False`` if capability not supported. |
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240 |
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241 Returns ``True`` if boolean capability is supported. Returns a string |
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242 if capability support is non-boolean. |
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243 """ |
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244 caps = self.capabilities() |
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245 if name in caps: |
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246 return True |
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247 |
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248 name = '%s=' % name |
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249 for cap in caps: |
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250 if cap.startswith(name): |
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251 return cap[len(name):] |
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252 |
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253 return False |
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254 |
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255 def requirecap(self, name, purpose): |
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256 """Require a capability to be present. |
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257 |
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258 Raises a ``CapabilityError`` if the capability isn't present. |
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259 """ |
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260 if self.capable(name): |
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261 return |
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262 |
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263 raise error.CapabilityError( |
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264 _('cannot %s; remote repository does not support the %r ' |
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265 'capability') % (purpose, name)) |
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266 |
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267 class legacypeer(peer, _baselegacywirecommands): |
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268 """peer but with support for legacy wire protocol commands.""" |