Mercurial > hg-stable
annotate mercurial/bundle2.py @ 21604:c399bf961cb9
bundle2: the ability to set ``data`` attribute of the part is now official
We make it safe to set the data attribute after part creation. It is an allowed
operation as long as the part has not started to be generated.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Thu, 22 May 2014 11:21:26 -0700 |
parents | 31be5a6fa716 |
children | f9dabfceb259 |
rev | line source |
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1 # bundle2.py - generic container format to transmit arbitrary data. |
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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 """Handling of the new bundle2 format |
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8 |
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9 The goal of bundle2 is to act as an atomically packet to transmit a set of |
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10 payloads in an application agnostic way. It consist in a sequence of "parts" |
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11 that will be handed to and processed by the application layer. |
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12 |
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13 |
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14 General format architecture |
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15 =========================== |
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16 |
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17 The format is architectured as follow |
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18 |
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19 - magic string |
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20 - stream level parameters |
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21 - payload parts (any number) |
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22 - end of stream marker. |
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23 |
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24 the Binary format |
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25 ============================ |
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26 |
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27 All numbers are unsigned and big-endian. |
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28 |
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29 stream level parameters |
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30 ------------------------ |
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31 |
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32 Binary format is as follow |
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33 |
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34 :params size: (16 bits integer) |
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35 |
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36 The total number of Bytes used by the parameters |
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37 |
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38 :params value: arbitrary number of Bytes |
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39 |
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40 A blob of `params size` containing the serialized version of all stream level |
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41 parameters. |
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42 |
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43 The blob contains a space separated list of parameters. Parameters with value |
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44 are stored in the form `<name>=<value>`. Both name and value are urlquoted. |
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45 |
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46 Empty name are obviously forbidden. |
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47 |
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48 Name MUST start with a letter. If this first letter is lower case, the |
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49 parameter is advisory and can be safely ignored. However when the first |
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50 letter is capital, the parameter is mandatory and the bundling process MUST |
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51 stop if he is not able to proceed it. |
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52 |
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53 Stream parameters use a simple textual format for two main reasons: |
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54 |
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55 - Stream level parameters should remain simple and we want to discourage any |
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56 crazy usage. |
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57 - Textual data allow easy human inspection of a bundle2 header in case of |
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58 troubles. |
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59 |
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60 Any Applicative level options MUST go into a bundle2 part instead. |
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61 |
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62 Payload part |
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63 ------------------------ |
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64 |
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65 Binary format is as follow |
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66 |
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67 :header size: (16 bits inter) |
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68 |
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69 The total number of Bytes used by the part headers. When the header is empty |
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70 (size = 0) this is interpreted as the end of stream marker. |
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71 |
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72 :header: |
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73 |
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74 The header defines how to interpret the part. It contains two piece of |
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75 data: the part type, and the part parameters. |
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76 |
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77 The part type is used to route an application level handler, that can |
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78 interpret payload. |
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79 |
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80 Part parameters are passed to the application level handler. They are |
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81 meant to convey information that will help the application level object to |
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82 interpret the part payload. |
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83 |
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84 The binary format of the header is has follow |
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85 |
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86 :typesize: (one byte) |
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87 |
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88 :parttype: alphanumerical part name |
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89 |
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90 :partid: A 32bits integer (unique in the bundle) that can be used to refer |
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91 to this part. |
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92 |
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93 :parameters: |
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94 |
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95 Part's parameter may have arbitrary content, the binary structure is:: |
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96 |
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97 <mandatory-count><advisory-count><param-sizes><param-data> |
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98 |
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99 :mandatory-count: 1 byte, number of mandatory parameters |
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100 |
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101 :advisory-count: 1 byte, number of advisory parameters |
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102 |
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103 :param-sizes: |
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104 |
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105 N couple of bytes, where N is the total number of parameters. Each |
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106 couple contains (<size-of-key>, <size-of-value) for one parameter. |
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107 |
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108 :param-data: |
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109 |
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110 A blob of bytes from which each parameter key and value can be |
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111 retrieved using the list of size couples stored in the previous |
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112 field. |
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113 |
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114 Mandatory parameters comes first, then the advisory ones. |
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115 |
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116 :payload: |
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117 |
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118 payload is a series of `<chunksize><chunkdata>`. |
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119 |
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120 `chunksize` is a 32 bits integer, `chunkdata` are plain bytes (as much as |
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121 `chunksize` says)` The payload part is concluded by a zero size chunk. |
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122 |
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123 The current implementation always produces either zero or one chunk. |
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124 This is an implementation limitation that will ultimately be lifted. |
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125 |
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126 Bundle processing |
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127 ============================ |
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128 |
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129 Each part is processed in order using a "part handler". Handler are registered |
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130 for a certain part type. |
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131 |
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132 The matching of a part to its handler is case insensitive. The case of the |
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133 part type is used to know if a part is mandatory or advisory. If the Part type |
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134 contains any uppercase char it is considered mandatory. When no handler is |
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135 known for a Mandatory part, the process is aborted and an exception is raised. |
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136 If the part is advisory and no handler is known, the part is ignored. When the |
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137 process is aborted, the full bundle is still read from the stream to keep the |
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138 channel usable. But none of the part read from an abort are processed. In the |
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139 future, dropping the stream may become an option for channel we do not care to |
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140 preserve. |
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141 """ |
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142 |
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143 import util |
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144 import struct |
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145 import urllib |
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146 import string |
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147 |
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148 import changegroup, error |
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149 from i18n import _ |
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150 |
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151 _pack = struct.pack |
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152 _unpack = struct.unpack |
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153 |
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154 _magicstring = 'HG2X' |
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155 |
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156 _fstreamparamsize = '>H' |
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157 _fpartheadersize = '>H' |
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158 _fparttypesize = '>B' |
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159 _fpartid = '>I' |
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160 _fpayloadsize = '>I' |
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161 _fpartparamcount = '>BB' |
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162 |
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163 preferedchunksize = 4096 |
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164 |
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165 def _makefpartparamsizes(nbparams): |
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166 """return a struct format to read part parameter sizes |
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167 |
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168 The number parameters is variable so we need to build that format |
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169 dynamically. |
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170 """ |
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171 return '>'+('BB'*nbparams) |
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172 |
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173 class UnknownPartError(KeyError): |
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174 """error raised when no handler is found for a Mandatory part""" |
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175 pass |
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176 |
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177 class ReadOnlyPartError(RuntimeError): |
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178 """error raised when code tries to alter a part being generated""" |
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179 pass |
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180 |
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181 parthandlermapping = {} |
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182 |
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183 def parthandler(parttype): |
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184 """decorator that register a function as a bundle2 part handler |
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185 |
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186 eg:: |
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187 |
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188 @parthandler('myparttype') |
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189 def myparttypehandler(...): |
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190 '''process a part of type "my part".''' |
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191 ... |
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192 """ |
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193 def _decorator(func): |
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194 lparttype = parttype.lower() # enforce lower case matching. |
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195 assert lparttype not in parthandlermapping |
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196 parthandlermapping[lparttype] = func |
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197 return func |
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198 return _decorator |
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199 |
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200 class unbundlerecords(object): |
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201 """keep record of what happens during and unbundle |
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202 |
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203 New records are added using `records.add('cat', obj)`. Where 'cat' is a |
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204 category of record and obj is an arbitrary object. |
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205 |
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206 `records['cat']` will return all entries of this category 'cat'. |
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207 |
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208 Iterating on the object itself will yield `('category', obj)` tuples |
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209 for all entries. |
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210 |
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211 All iterations happens in chronological order. |
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212 """ |
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213 |
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214 def __init__(self): |
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215 self._categories = {} |
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216 self._sequences = [] |
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217 self._replies = {} |
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218 |
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219 def add(self, category, entry, inreplyto=None): |
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220 """add a new record of a given category. |
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221 |
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222 The entry can then be retrieved in the list returned by |
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223 self['category'].""" |
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224 self._categories.setdefault(category, []).append(entry) |
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225 self._sequences.append((category, entry)) |
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226 if inreplyto is not None: |
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227 self.getreplies(inreplyto).add(category, entry) |
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228 |
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229 def getreplies(self, partid): |
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230 """get the subrecords that replies to a specific part""" |
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231 return self._replies.setdefault(partid, unbundlerecords()) |
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232 |
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233 def __getitem__(self, cat): |
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234 return tuple(self._categories.get(cat, ())) |
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235 |
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236 def __iter__(self): |
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237 return iter(self._sequences) |
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238 |
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239 def __len__(self): |
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240 return len(self._sequences) |
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241 |
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242 def __nonzero__(self): |
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243 return bool(self._sequences) |
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244 |
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245 class bundleoperation(object): |
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246 """an object that represents a single bundling process |
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247 |
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248 Its purpose is to carry unbundle-related objects and states. |
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249 |
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250 A new object should be created at the beginning of each bundle processing. |
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251 The object is to be returned by the processing function. |
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252 |
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253 The object has very little content now it will ultimately contain: |
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254 * an access to the repo the bundle is applied to, |
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255 * a ui object, |
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256 * a way to retrieve a transaction to add changes to the repo, |
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257 * a way to record the result of processing each part, |
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258 * a way to construct a bundle response when applicable. |
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259 """ |
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260 |
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261 def __init__(self, repo, transactiongetter): |
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262 self.repo = repo |
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263 self.ui = repo.ui |
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264 self.records = unbundlerecords() |
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265 self.gettransaction = transactiongetter |
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266 self.reply = None |
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267 |
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268 class TransactionUnavailable(RuntimeError): |
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269 pass |
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270 |
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271 def _notransaction(): |
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272 """default method to get a transaction while processing a bundle |
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273 |
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274 Raise an exception to highlight the fact that no transaction was expected |
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275 to be created""" |
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276 raise TransactionUnavailable() |
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277 |
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278 def processbundle(repo, unbundler, transactiongetter=_notransaction): |
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279 """This function process a bundle, apply effect to/from a repo |
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280 |
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281 It iterates over each part then searches for and uses the proper handling |
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282 code to process the part. Parts are processed in order. |
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283 |
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284 This is very early version of this function that will be strongly reworked |
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285 before final usage. |
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286 |
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287 Unknown Mandatory part will abort the process. |
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288 """ |
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289 op = bundleoperation(repo, transactiongetter) |
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290 # todo: |
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291 # - replace this is a init function soon. |
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292 # - exception catching |
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293 unbundler.params |
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294 iterparts = unbundler.iterparts() |
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295 part = None |
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296 try: |
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297 for part in iterparts: |
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298 parttype = part.type |
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299 # part key are matched lower case |
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300 key = parttype.lower() |
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301 try: |
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302 handler = parthandlermapping[key] |
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303 op.ui.debug('found a handler for part %r\n' % parttype) |
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304 except KeyError: |
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305 if key != parttype: # mandatory parts |
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306 # todo: |
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307 # - use a more precise exception |
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308 raise UnknownPartError(key) |
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309 op.ui.debug('ignoring unknown advisory part %r\n' % key) |
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310 # consuming the part |
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311 part.read() |
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312 continue |
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313 |
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314 # handler is called outside the above try block so that we don't |
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315 # risk catching KeyErrors from anything other than the |
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316 # parthandlermapping lookup (any KeyError raised by handler() |
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317 # itself represents a defect of a different variety). |
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318 output = None |
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319 if op.reply is not None: |
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320 op.ui.pushbuffer(error=True) |
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321 output = '' |
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322 try: |
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323 handler(op, part) |
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324 finally: |
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325 if output is not None: |
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326 output = op.ui.popbuffer() |
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327 if output: |
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328 op.reply.newpart('b2x:output', |
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329 advisoryparams=[('in-reply-to', |
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330 str(part.id))], |
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331 data=output) |
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332 part.read() |
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333 except Exception, exc: |
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334 if part is not None: |
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335 # consume the bundle content |
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336 part.read() |
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337 for part in iterparts: |
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338 # consume the bundle content |
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339 part.read() |
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340 # Small hack to let caller code distinguish exceptions from bundle2 |
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341 # processing fron the ones from bundle1 processing. This is mostly |
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342 # needed to handle different return codes to unbundle according to the |
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343 # type of bundle. We should probably clean up or drop this return code |
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344 # craziness in a future version. |
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345 exc.duringunbundle2 = True |
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346 raise |
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347 return op |
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348 |
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349 def decodecaps(blob): |
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350 """decode a bundle2 caps bytes blob into a dictionnary |
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351 |
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352 The blob is a list of capabilities (one per line) |
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353 Capabilities may have values using a line of the form:: |
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354 |
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355 capability=value1,value2,value3 |
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356 |
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357 The values are always a list.""" |
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358 caps = {} |
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359 for line in blob.splitlines(): |
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360 if not line: |
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361 continue |
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362 if '=' not in line: |
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363 key, vals = line, () |
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364 else: |
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365 key, vals = line.split('=', 1) |
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366 vals = vals.split(',') |
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367 key = urllib.unquote(key) |
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368 vals = [urllib.unquote(v) for v in vals] |
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369 caps[key] = vals |
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370 return caps |
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371 |
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372 def encodecaps(caps): |
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373 """encode a bundle2 caps dictionary into a bytes blob""" |
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374 chunks = [] |
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375 for ca in sorted(caps): |
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376 vals = caps[ca] |
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377 ca = urllib.quote(ca) |
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378 vals = [urllib.quote(v) for v in vals] |
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379 if vals: |
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380 ca = "%s=%s" % (ca, ','.join(vals)) |
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381 chunks.append(ca) |
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382 return '\n'.join(chunks) |
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383 |
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384 class bundle20(object): |
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385 """represent an outgoing bundle2 container |
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386 |
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387 Use the `addparam` method to add stream level parameter. and `newpart` to |
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388 populate it. Then call `getchunks` to retrieve all the binary chunks of |
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389 data that compose the bundle2 container.""" |
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390 |
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391 def __init__(self, ui, capabilities=()): |
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392 self.ui = ui |
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393 self._params = [] |
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394 self._parts = [] |
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395 self.capabilities = dict(capabilities) |
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396 |
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397 # methods used to defines the bundle2 content |
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398 def addparam(self, name, value=None): |
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399 """add a stream level parameter""" |
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400 if not name: |
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401 raise ValueError('empty parameter name') |
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402 if name[0] not in string.letters: |
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403 raise ValueError('non letter first character: %r' % name) |
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404 self._params.append((name, value)) |
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405 |
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406 def addpart(self, part): |
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407 """add a new part to the bundle2 container |
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408 |
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409 Parts contains the actual applicative payload.""" |
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410 assert part.id is None |
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411 part.id = len(self._parts) # very cheap counter |
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412 self._parts.append(part) |
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413 |
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414 def newpart(self, typeid, *args, **kwargs): |
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415 """create a new part and add it to the containers |
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416 |
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417 As the part is directly added to the containers. For now, this means |
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418 that any failure to properly initialize the part after calling |
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419 ``newpart`` should result in a failure of the whole bundling process. |
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420 |
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421 You can still fall back to manually create and add if you need better |
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422 control.""" |
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423 part = bundlepart(typeid, *args, **kwargs) |
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424 self.addpart(part) |
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425 return part |
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426 |
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427 # methods used to generate the bundle2 stream |
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428 def getchunks(self): |
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429 self.ui.debug('start emission of %s stream\n' % _magicstring) |
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430 yield _magicstring |
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431 param = self._paramchunk() |
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432 self.ui.debug('bundle parameter: %s\n' % param) |
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433 yield _pack(_fstreamparamsize, len(param)) |
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434 if param: |
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435 yield param |
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436 |
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437 self.ui.debug('start of parts\n') |
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438 for part in self._parts: |
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439 self.ui.debug('bundle part: "%s"\n' % part.type) |
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440 for chunk in part.getchunks(): |
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441 yield chunk |
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442 self.ui.debug('end of bundle\n') |
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443 yield '\0\0' |
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444 |
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445 def _paramchunk(self): |
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446 """return a encoded version of all stream parameters""" |
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447 blocks = [] |
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448 for par, value in self._params: |
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449 par = urllib.quote(par) |
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450 if value is not None: |
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451 value = urllib.quote(value) |
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452 par = '%s=%s' % (par, value) |
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453 blocks.append(par) |
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454 return ' '.join(blocks) |
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455 |
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456 class unpackermixin(object): |
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457 """A mixin to extract bytes and struct data from a stream""" |
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458 |
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459 def __init__(self, fp): |
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460 self._fp = fp |
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461 |
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462 def _unpack(self, format): |
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463 """unpack this struct format from the stream""" |
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464 data = self._readexact(struct.calcsize(format)) |
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465 return _unpack(format, data) |
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466 |
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467 def _readexact(self, size): |
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468 """read exactly <size> bytes from the stream""" |
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469 return changegroup.readexactly(self._fp, size) |
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470 |
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471 |
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472 class unbundle20(unpackermixin): |
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473 """interpret a bundle2 stream |
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474 |
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475 This class is fed with a binary stream and yields parts through its |
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476 `iterparts` methods.""" |
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477 |
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478 def __init__(self, ui, fp, header=None): |
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479 """If header is specified, we do not read it out of the stream.""" |
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480 self.ui = ui |
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481 super(unbundle20, self).__init__(fp) |
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482 if header is None: |
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483 header = self._readexact(4) |
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484 magic, version = header[0:2], header[2:4] |
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485 if magic != 'HG': |
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486 raise util.Abort(_('not a Mercurial bundle')) |
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487 if version != '2X': |
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488 raise util.Abort(_('unknown bundle version %s') % version) |
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489 self.ui.debug('start processing of %s stream\n' % header) |
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490 |
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491 @util.propertycache |
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492 def params(self): |
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493 """dictionary of stream level parameters""" |
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494 self.ui.debug('reading bundle2 stream parameters\n') |
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495 params = {} |
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496 paramssize = self._unpack(_fstreamparamsize)[0] |
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497 if paramssize: |
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498 for p in self._readexact(paramssize).split(' '): |
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499 p = p.split('=', 1) |
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500 p = [urllib.unquote(i) for i in p] |
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501 if len(p) < 2: |
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502 p.append(None) |
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503 self._processparam(*p) |
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504 params[p[0]] = p[1] |
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505 return params |
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506 |
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507 def _processparam(self, name, value): |
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508 """process a parameter, applying its effect if needed |
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509 |
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510 Parameter starting with a lower case letter are advisory and will be |
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511 ignored when unknown. Those starting with an upper case letter are |
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512 mandatory and will this function will raise a KeyError when unknown. |
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513 |
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514 Note: no option are currently supported. Any input will be either |
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515 ignored or failing. |
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516 """ |
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517 if not name: |
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518 raise ValueError('empty parameter name') |
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519 if name[0] not in string.letters: |
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520 raise ValueError('non letter first character: %r' % name) |
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521 # Some logic will be later added here to try to process the option for |
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522 # a dict of known parameter. |
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523 if name[0].islower(): |
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524 self.ui.debug("ignoring unknown parameter %r\n" % name) |
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525 else: |
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526 raise KeyError(name) |
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527 |
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528 |
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529 def iterparts(self): |
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530 """yield all parts contained in the stream""" |
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531 # make sure param have been loaded |
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532 self.params |
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533 self.ui.debug('start extraction of bundle2 parts\n') |
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534 headerblock = self._readpartheader() |
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535 while headerblock is not None: |
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536 part = unbundlepart(self.ui, headerblock, self._fp) |
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537 yield part |
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538 headerblock = self._readpartheader() |
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539 self.ui.debug('end of bundle2 stream\n') |
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540 |
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541 def _readpartheader(self): |
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542 """reads a part header size and return the bytes blob |
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543 |
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544 returns None if empty""" |
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545 headersize = self._unpack(_fpartheadersize)[0] |
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546 self.ui.debug('part header size: %i\n' % headersize) |
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547 if headersize: |
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548 return self._readexact(headersize) |
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549 return None |
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550 |
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551 |
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552 class bundlepart(object): |
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553 """A bundle2 part contains application level payload |
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554 |
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555 The part `type` is used to route the part to the application level |
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556 handler. |
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557 |
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558 The part payload is contained in ``part.data``. It could be raw bytes or a |
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559 generator of byte chunks. The data attribute cannot be modified after the |
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560 generation has begun. |
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561 """ |
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562 |
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563 def __init__(self, parttype, mandatoryparams=(), advisoryparams=(), |
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564 data=''): |
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565 self.id = None |
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566 self.type = parttype |
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567 self._data = data |
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568 self.mandatoryparams = mandatoryparams |
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569 self.advisoryparams = advisoryparams |
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570 # status of the part's generation: |
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571 # - None: not started, |
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572 # - False: currently generated, |
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573 # - True: generation done. |
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574 self._generated = None |
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575 |
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576 # methods used to defines the part content |
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577 def __setdata(self, data): |
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578 if self._generated is not None: |
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579 raise ReadOnlyPartError('part is being generated') |
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580 self._data = data |
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581 def __getdata(self): |
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582 return self._data |
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583 data = property(__getdata, __setdata) |
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584 |
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585 # methods used to generates the bundle2 stream |
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586 def getchunks(self): |
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587 if self._generated is not None: |
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588 raise RuntimeError('part can only be consumed once') |
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589 self._generated = False |
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590 #### header |
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591 ## parttype |
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592 header = [_pack(_fparttypesize, len(self.type)), |
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593 self.type, _pack(_fpartid, self.id), |
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594 ] |
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595 ## parameters |
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596 # count |
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597 manpar = self.mandatoryparams |
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598 advpar = self.advisoryparams |
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599 header.append(_pack(_fpartparamcount, len(manpar), len(advpar))) |
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600 # size |
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601 parsizes = [] |
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602 for key, value in manpar: |
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603 parsizes.append(len(key)) |
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604 parsizes.append(len(value)) |
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605 for key, value in advpar: |
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606 parsizes.append(len(key)) |
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607 parsizes.append(len(value)) |
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608 paramsizes = _pack(_makefpartparamsizes(len(parsizes) / 2), *parsizes) |
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609 header.append(paramsizes) |
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610 # key, value |
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611 for key, value in manpar: |
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612 header.append(key) |
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613 header.append(value) |
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614 for key, value in advpar: |
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615 header.append(key) |
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616 header.append(value) |
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617 ## finalize header |
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618 headerchunk = ''.join(header) |
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619 yield _pack(_fpartheadersize, len(headerchunk)) |
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620 yield headerchunk |
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621 ## payload |
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622 for chunk in self._payloadchunks(): |
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623 yield _pack(_fpayloadsize, len(chunk)) |
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624 yield chunk |
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625 # end of payload |
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626 yield _pack(_fpayloadsize, 0) |
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627 self._generated = True |
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628 |
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629 def _payloadchunks(self): |
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630 """yield chunks of a the part payload |
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631 |
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632 Exists to handle the different methods to provide data to a part.""" |
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633 # we only support fixed size data now. |
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634 # This will be improved in the future. |
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635 if util.safehasattr(self.data, 'next'): |
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636 buff = util.chunkbuffer(self.data) |
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637 chunk = buff.read(preferedchunksize) |
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638 while chunk: |
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639 yield chunk |
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640 chunk = buff.read(preferedchunksize) |
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641 elif len(self.data): |
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642 yield self.data |
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643 |
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644 class unbundlepart(unpackermixin): |
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645 """a bundle part read from a bundle""" |
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646 |
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647 def __init__(self, ui, header, fp): |
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648 super(unbundlepart, self).__init__(fp) |
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649 self.ui = ui |
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650 # unbundle state attr |
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651 self._headerdata = header |
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652 self._headeroffset = 0 |
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653 self._initialized = False |
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654 self.consumed = False |
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655 # part data |
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656 self.id = None |
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657 self.type = None |
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658 self.mandatoryparams = None |
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659 self.advisoryparams = None |
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660 self._payloadstream = None |
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661 self._readheader() |
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662 |
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663 def _fromheader(self, size): |
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664 """return the next <size> byte from the header""" |
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665 offset = self._headeroffset |
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666 data = self._headerdata[offset:(offset + size)] |
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667 self._headeroffset = offset + size |
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668 return data |
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669 |
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670 def _unpackheader(self, format): |
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671 """read given format from header |
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672 |
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673 This automatically compute the size of the format to read.""" |
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674 data = self._fromheader(struct.calcsize(format)) |
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675 return _unpack(format, data) |
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676 |
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677 def _readheader(self): |
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678 """read the header and setup the object""" |
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679 typesize = self._unpackheader(_fparttypesize)[0] |
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680 self.type = self._fromheader(typesize) |
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681 self.ui.debug('part type: "%s"\n' % self.type) |
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682 self.id = self._unpackheader(_fpartid)[0] |
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683 self.ui.debug('part id: "%s"\n' % self.id) |
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684 ## reading parameters |
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685 # param count |
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686 mancount, advcount = self._unpackheader(_fpartparamcount) |
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687 self.ui.debug('part parameters: %i\n' % (mancount + advcount)) |
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688 # param size |
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689 fparamsizes = _makefpartparamsizes(mancount + advcount) |
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690 paramsizes = self._unpackheader(fparamsizes) |
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691 # make it a list of couple again |
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692 paramsizes = zip(paramsizes[::2], paramsizes[1::2]) |
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693 # split mandatory from advisory |
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694 mansizes = paramsizes[:mancount] |
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695 advsizes = paramsizes[mancount:] |
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696 # retrive param value |
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697 manparams = [] |
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698 for key, value in mansizes: |
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699 manparams.append((self._fromheader(key), self._fromheader(value))) |
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700 advparams = [] |
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701 for key, value in advsizes: |
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702 advparams.append((self._fromheader(key), self._fromheader(value))) |
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703 self.mandatoryparams = manparams |
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704 self.advisoryparams = advparams |
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705 ## part payload |
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706 def payloadchunks(): |
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707 payloadsize = self._unpack(_fpayloadsize)[0] |
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708 self.ui.debug('payload chunk size: %i\n' % payloadsize) |
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709 while payloadsize: |
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710 yield self._readexact(payloadsize) |
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711 payloadsize = self._unpack(_fpayloadsize)[0] |
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712 self.ui.debug('payload chunk size: %i\n' % payloadsize) |
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713 self._payloadstream = util.chunkbuffer(payloadchunks()) |
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714 # we read the data, tell it |
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715 self._initialized = True |
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716 |
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717 def read(self, size=None): |
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718 """read payload data""" |
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719 if not self._initialized: |
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720 self._readheader() |
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721 if size is None: |
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722 data = self._payloadstream.read() |
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723 else: |
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724 data = self._payloadstream.read(size) |
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725 if size is None or len(data) < size: |
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726 self.consumed = True |
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727 return data |
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728 |
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729 |
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730 @parthandler('b2x:changegroup') |
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731 def handlechangegroup(op, inpart): |
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732 """apply a changegroup part on the repo |
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733 |
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734 This is a very early implementation that will massive rework before being |
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735 inflicted to any end-user. |
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736 """ |
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737 # Make sure we trigger a transaction creation |
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738 # |
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739 # The addchangegroup function will get a transaction object by itself, but |
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740 # we need to make sure we trigger the creation of a transaction object used |
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741 # for the whole processing scope. |
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742 op.gettransaction() |
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743 cg = changegroup.unbundle10(inpart, 'UN') |
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744 ret = changegroup.addchangegroup(op.repo, cg, 'bundle2', 'bundle2') |
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745 op.records.add('changegroup', {'return': ret}) |
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746 if op.reply is not None: |
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747 # This is definitly not the final form of this |
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748 # return. But one need to start somewhere. |
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749 op.reply.newpart('b2x:reply:changegroup', (), |
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750 [('in-reply-to', str(inpart.id)), |
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751 ('return', '%i' % ret)]) |
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752 assert not inpart.read() |
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753 |
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754 @parthandler('b2x:reply:changegroup') |
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755 def handlechangegroup(op, inpart): |
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756 p = dict(inpart.advisoryparams) |
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757 ret = int(p['return']) |
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758 op.records.add('changegroup', {'return': ret}, int(p['in-reply-to'])) |
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759 |
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760 @parthandler('b2x:check:heads') |
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761 def handlechangegroup(op, inpart): |
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762 """check that head of the repo did not change |
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763 |
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764 This is used to detect a push race when using unbundle. |
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765 This replaces the "heads" argument of unbundle.""" |
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766 h = inpart.read(20) |
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767 heads = [] |
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768 while len(h) == 20: |
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769 heads.append(h) |
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770 h = inpart.read(20) |
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771 assert not h |
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772 if heads != op.repo.heads(): |
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773 raise error.PushRaced('repository changed while pushing - ' |
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774 'please try again') |
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775 |
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776 @parthandler('b2x:output') |
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777 def handleoutput(op, inpart): |
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778 """forward output captured on the server to the client""" |
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779 for line in inpart.read().splitlines(): |
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780 op.ui.write(('remote: %s\n' % line)) |
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781 |
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782 @parthandler('b2x:replycaps') |
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783 def handlereplycaps(op, inpart): |
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784 """Notify that a reply bundle should be created |
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785 |
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786 The payload contains the capabilities information for the reply""" |
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787 caps = decodecaps(inpart.read()) |
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788 if op.reply is None: |
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789 op.reply = bundle20(op.ui, caps) |
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790 |
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791 @parthandler('b2x:error:abort') |
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792 def handlereplycaps(op, inpart): |
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793 """Used to transmit abort error over the wire""" |
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794 manargs = dict(inpart.mandatoryparams) |
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795 advargs = dict(inpart.advisoryparams) |
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796 raise util.Abort(manargs['message'], hint=advargs.get('hint')) |
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797 |
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798 @parthandler('b2x:error:unknownpart') |
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799 def handlereplycaps(op, inpart): |
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800 """Used to transmit unknown part error over the wire""" |
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801 manargs = dict(inpart.mandatoryparams) |
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802 raise UnknownPartError(manargs['parttype']) |
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803 |
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804 @parthandler('b2x:error:pushraced') |
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805 def handlereplycaps(op, inpart): |
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806 """Used to transmit push race error over the wire""" |
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807 manargs = dict(inpart.mandatoryparams) |
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808 raise error.ResponseError(_('push failed:'), manargs['message']) |