Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/wireprototypes.py @ 37728:564a3eec6e63

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wireprotov2: add support for more response types This adds types to represent error and generator responses from server commands. Differential Revision: https://phab.mercurial-scm.org/D3388
author Gregory Szorc <gregory.szorc@gmail.com>
date Sun, 15 Apr 2018 10:37:29 -0700
parents 77c9ee77687c
children 352932a11905
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com>
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2 #
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3 # This software may be used and distributed according to the terms of the
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4 # GNU General Public License version 2 or any later version.
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5
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6 from __future__ import absolute_import
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7
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8 from .node import (
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9 bin,
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10 hex,
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11 )
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12 from .thirdparty.zope import (
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13 interface as zi,
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14 )
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15
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16 # Names of the SSH protocol implementations.
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17 SSHV1 = 'ssh-v1'
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18 # These are advertised over the wire. Increment the counters at the end
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19 # to reflect BC breakages.
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20 SSHV2 = 'exp-ssh-v2-0001'
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21 HTTP_WIREPROTO_V2 = 'exp-http-v2-0001'
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22
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23 # All available wire protocol transports.
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24 TRANSPORTS = {
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25 SSHV1: {
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26 'transport': 'ssh',
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27 'version': 1,
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28 },
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29 SSHV2: {
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30 'transport': 'ssh',
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31 # TODO mark as version 2 once all commands are implemented.
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32 'version': 1,
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33 },
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34 'http-v1': {
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35 'transport': 'http',
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36 'version': 1,
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37 },
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38 HTTP_WIREPROTO_V2: {
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39 'transport': 'http',
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40 'version': 2,
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41 }
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42 }
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43
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44 class bytesresponse(object):
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45 """A wire protocol response consisting of raw bytes."""
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46 def __init__(self, data):
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47 self.data = data
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48
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49 class ooberror(object):
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50 """wireproto reply: failure of a batch of operation
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51
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52 Something failed during a batch call. The error message is stored in
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53 `self.message`.
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54 """
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55 def __init__(self, message):
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56 self.message = message
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57
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58 class pushres(object):
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59 """wireproto reply: success with simple integer return
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60
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61 The call was successful and returned an integer contained in `self.res`.
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62 """
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63 def __init__(self, res, output):
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64 self.res = res
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65 self.output = output
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66
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67 class pusherr(object):
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68 """wireproto reply: failure
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69
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70 The call failed. The `self.res` attribute contains the error message.
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71 """
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72 def __init__(self, res, output):
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73 self.res = res
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74 self.output = output
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75
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76 class streamres(object):
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77 """wireproto reply: binary stream
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78
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79 The call was successful and the result is a stream.
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80
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81 Accepts a generator containing chunks of data to be sent to the client.
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82
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83 ``prefer_uncompressed`` indicates that the data is expected to be
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84 uncompressable and that the stream should therefore use the ``none``
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85 engine.
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86 """
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87 def __init__(self, gen=None, prefer_uncompressed=False):
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88 self.gen = gen
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89 self.prefer_uncompressed = prefer_uncompressed
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90
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91 class streamreslegacy(object):
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92 """wireproto reply: uncompressed binary stream
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93
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94 The call was successful and the result is a stream.
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95
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96 Accepts a generator containing chunks of data to be sent to the client.
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97
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98 Like ``streamres``, but sends an uncompressed data for "version 1" clients
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99 using the application/mercurial-0.1 media type.
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100 """
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101 def __init__(self, gen=None):
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102 self.gen = gen
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103
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104 class cborresponse(object):
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105 """Encode the response value as CBOR."""
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106 def __init__(self, v):
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107 self.value = v
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108
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109 class v2errorresponse(object):
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110 """Represents a command error for version 2 transports."""
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111 def __init__(self, message, args=None):
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112 self.message = message
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113 self.args = args
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114
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115 class v2streamingresponse(object):
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116 """A response whose data is supplied by a generator.
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117
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118 The generator can either consist of data structures to CBOR
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119 encode or a stream of already-encoded bytes.
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120 """
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121 def __init__(self, gen, compressible=True):
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122 self.gen = gen
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123 self.compressible = compressible
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124
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125 # list of nodes encoding / decoding
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126 def decodelist(l, sep=' '):
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127 if l:
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128 return [bin(v) for v in l.split(sep)]
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129 return []
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130
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131 def encodelist(l, sep=' '):
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132 try:
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133 return sep.join(map(hex, l))
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134 except TypeError:
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135 raise
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136
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137 # batched call argument encoding
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138
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139 def escapebatcharg(plain):
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140 return (plain
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141 .replace(':', ':c')
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142 .replace(',', ':o')
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143 .replace(';', ':s')
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144 .replace('=', ':e'))
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145
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146 def unescapebatcharg(escaped):
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147 return (escaped
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148 .replace(':e', '=')
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149 .replace(':s', ';')
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150 .replace(':o', ',')
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151 .replace(':c', ':'))
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152
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153 # mapping of options accepted by getbundle and their types
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154 #
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155 # Meant to be extended by extensions. It is extensions responsibility to ensure
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156 # such options are properly processed in exchange.getbundle.
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157 #
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158 # supported types are:
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159 #
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160 # :nodes: list of binary nodes
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161 # :csv: list of comma-separated values
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162 # :scsv: list of comma-separated values return as set
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163 # :plain: string with no transformation needed.
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164 GETBUNDLE_ARGUMENTS = {
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165 'heads': 'nodes',
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166 'bookmarks': 'boolean',
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167 'common': 'nodes',
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168 'obsmarkers': 'boolean',
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169 'phases': 'boolean',
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170 'bundlecaps': 'scsv',
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171 'listkeys': 'csv',
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172 'cg': 'boolean',
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173 'cbattempted': 'boolean',
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174 'stream': 'boolean',
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175 }
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176
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177 class baseprotocolhandler(zi.Interface):
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178 """Abstract base class for wire protocol handlers.
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179
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180 A wire protocol handler serves as an interface between protocol command
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181 handlers and the wire protocol transport layer. Protocol handlers provide
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182 methods to read command arguments, redirect stdio for the duration of
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183 the request, handle response types, etc.
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184 """
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185
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186 name = zi.Attribute(
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187 """The name of the protocol implementation.
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188
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189 Used for uniquely identifying the transport type.
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190 """)
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191
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192 def getargs(args):
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193 """return the value for arguments in <args>
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194
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195 For version 1 transports, returns a list of values in the same
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196 order they appear in ``args``. For version 2 transports, returns
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197 a dict mapping argument name to value.
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198 """
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199
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200 def getprotocaps():
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201 """Returns the list of protocol-level capabilities of client
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202
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203 Returns a list of capabilities as declared by the client for
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204 the current request (or connection for stateful protocol handlers)."""
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205
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206 def getpayload():
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207 """Provide a generator for the raw payload.
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208
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209 The caller is responsible for ensuring that the full payload is
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210 processed.
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211 """
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212
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213 def mayberedirectstdio():
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214 """Context manager to possibly redirect stdio.
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215
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216 The context manager yields a file-object like object that receives
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217 stdout and stderr output when the context manager is active. Or it
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218 yields ``None`` if no I/O redirection occurs.
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219
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220 The intent of this context manager is to capture stdio output
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221 so it may be sent in the response. Some transports support streaming
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222 stdio to the client in real time. For these transports, stdio output
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223 won't be captured.
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224 """
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225
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226 def client():
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227 """Returns a string representation of this client (as bytes)."""
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228
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229 def addcapabilities(repo, caps):
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230 """Adds advertised capabilities specific to this protocol.
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231
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232 Receives the list of capabilities collected so far.
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233
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234 Returns a list of capabilities. The passed in argument can be returned.
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235 """
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236
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237 def checkperm(perm):
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238 """Validate that the client has permissions to perform a request.
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239
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240 The argument is the permission required to proceed. If the client
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241 doesn't have that permission, the exception should raise or abort
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242 in a protocol specific manner.
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243 """