Mercurial > hg
annotate mercurial/bundle2.py @ 23904:d251da5e0e84
transaction: include backup file in the "undo" transaction
Once the transaction is closed, we now write transaction related data for
possible future undo. For now, we only do it for full file "backup" because
their were not handle at all in that case. In the future, we could move all the
current logic to set undo up (that currently exists in localrepository) inside
transaction itself, but it is not strictly requires to solve the current
situation.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Fri, 16 Jan 2015 18:34:14 -0800 |
parents | 405eacbecc52 |
children | a3f7c781786b |
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: int32 |
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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: int32 |
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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 (restricted to ^a-zA-Z0-9_:-]) |
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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 Each parameter's key MUST be unique within the part. |
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117 |
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118 :payload: |
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119 |
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120 payload is a series of `<chunksize><chunkdata>`. |
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121 |
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122 `chunksize` is an int32, `chunkdata` are plain bytes (as much as |
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123 `chunksize` says)` The payload part is concluded by a zero size chunk. |
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124 |
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125 The current implementation always produces either zero or one chunk. |
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126 This is an implementation limitation that will ultimately be lifted. |
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127 |
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128 `chunksize` can be negative to trigger special case processing. No such |
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129 processing is in place yet. |
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130 |
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131 Bundle processing |
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132 ============================ |
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133 |
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134 Each part is processed in order using a "part handler". Handler are registered |
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135 for a certain part type. |
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136 |
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137 The matching of a part to its handler is case insensitive. The case of the |
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138 part type is used to know if a part is mandatory or advisory. If the Part type |
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139 contains any uppercase char it is considered mandatory. When no handler is |
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140 known for a Mandatory part, the process is aborted and an exception is raised. |
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141 If the part is advisory and no handler is known, the part is ignored. When the |
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142 process is aborted, the full bundle is still read from the stream to keep the |
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143 channel usable. But none of the part read from an abort are processed. In the |
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144 future, dropping the stream may become an option for channel we do not care to |
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145 preserve. |
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146 """ |
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147 |
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148 import sys |
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149 import util |
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150 import struct |
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151 import urllib |
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152 import string |
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153 import obsolete |
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154 import pushkey |
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155 import url |
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156 import re |
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157 |
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158 import changegroup, error |
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159 from i18n import _ |
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160 |
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161 _pack = struct.pack |
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162 _unpack = struct.unpack |
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163 |
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164 _magicstring = 'HG2Y' |
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165 |
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166 _fstreamparamsize = '>i' |
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167 _fpartheadersize = '>i' |
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168 _fparttypesize = '>B' |
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169 _fpartid = '>I' |
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170 _fpayloadsize = '>i' |
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171 _fpartparamcount = '>BB' |
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172 |
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173 preferedchunksize = 4096 |
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174 |
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175 _parttypeforbidden = re.compile('[^a-zA-Z0-9_:-]') |
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176 |
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177 def validateparttype(parttype): |
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178 """raise ValueError if a parttype contains invalid character""" |
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179 if _parttypeforbidden.match(parttype): |
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180 raise ValueError(parttype) |
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181 |
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182 def _makefpartparamsizes(nbparams): |
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183 """return a struct format to read part parameter sizes |
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184 |
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185 The number parameters is variable so we need to build that format |
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186 dynamically. |
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187 """ |
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188 return '>'+('BB'*nbparams) |
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189 |
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190 parthandlermapping = {} |
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191 |
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192 def parthandler(parttype, params=()): |
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193 """decorator that register a function as a bundle2 part handler |
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194 |
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195 eg:: |
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196 |
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197 @parthandler('myparttype', ('mandatory', 'param', 'handled')) |
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198 def myparttypehandler(...): |
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199 '''process a part of type "my part".''' |
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200 ... |
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201 """ |
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202 validateparttype(parttype) |
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203 def _decorator(func): |
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204 lparttype = parttype.lower() # enforce lower case matching. |
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205 assert lparttype not in parthandlermapping |
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206 parthandlermapping[lparttype] = func |
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207 func.params = frozenset(params) |
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208 return func |
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209 return _decorator |
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210 |
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211 class unbundlerecords(object): |
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212 """keep record of what happens during and unbundle |
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213 |
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214 New records are added using `records.add('cat', obj)`. Where 'cat' is a |
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215 category of record and obj is an arbitrary object. |
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216 |
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217 `records['cat']` will return all entries of this category 'cat'. |
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218 |
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219 Iterating on the object itself will yield `('category', obj)` tuples |
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220 for all entries. |
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221 |
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222 All iterations happens in chronological order. |
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223 """ |
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224 |
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225 def __init__(self): |
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226 self._categories = {} |
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227 self._sequences = [] |
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228 self._replies = {} |
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229 |
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230 def add(self, category, entry, inreplyto=None): |
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231 """add a new record of a given category. |
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232 |
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233 The entry can then be retrieved in the list returned by |
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234 self['category'].""" |
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235 self._categories.setdefault(category, []).append(entry) |
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236 self._sequences.append((category, entry)) |
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237 if inreplyto is not None: |
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238 self.getreplies(inreplyto).add(category, entry) |
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239 |
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240 def getreplies(self, partid): |
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241 """get the records that are replies to a specific part""" |
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242 return self._replies.setdefault(partid, unbundlerecords()) |
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243 |
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244 def __getitem__(self, cat): |
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245 return tuple(self._categories.get(cat, ())) |
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246 |
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247 def __iter__(self): |
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248 return iter(self._sequences) |
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249 |
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250 def __len__(self): |
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251 return len(self._sequences) |
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252 |
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253 def __nonzero__(self): |
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254 return bool(self._sequences) |
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255 |
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256 class bundleoperation(object): |
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257 """an object that represents a single bundling process |
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258 |
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259 Its purpose is to carry unbundle-related objects and states. |
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260 |
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261 A new object should be created at the beginning of each bundle processing. |
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262 The object is to be returned by the processing function. |
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263 |
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264 The object has very little content now it will ultimately contain: |
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265 * an access to the repo the bundle is applied to, |
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266 * a ui object, |
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267 * a way to retrieve a transaction to add changes to the repo, |
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268 * a way to record the result of processing each part, |
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269 * a way to construct a bundle response when applicable. |
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270 """ |
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271 |
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272 def __init__(self, repo, transactiongetter): |
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273 self.repo = repo |
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274 self.ui = repo.ui |
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275 self.records = unbundlerecords() |
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276 self.gettransaction = transactiongetter |
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277 self.reply = None |
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278 |
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279 class TransactionUnavailable(RuntimeError): |
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280 pass |
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281 |
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282 def _notransaction(): |
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283 """default method to get a transaction while processing a bundle |
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284 |
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285 Raise an exception to highlight the fact that no transaction was expected |
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286 to be created""" |
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287 raise TransactionUnavailable() |
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288 |
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289 def processbundle(repo, unbundler, transactiongetter=None): |
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290 """This function process a bundle, apply effect to/from a repo |
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291 |
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292 It iterates over each part then searches for and uses the proper handling |
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293 code to process the part. Parts are processed in order. |
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294 |
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295 This is very early version of this function that will be strongly reworked |
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296 before final usage. |
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297 |
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298 Unknown Mandatory part will abort the process. |
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299 """ |
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300 if transactiongetter is None: |
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301 transactiongetter = _notransaction |
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302 op = bundleoperation(repo, transactiongetter) |
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303 # todo: |
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304 # - replace this is a init function soon. |
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305 # - exception catching |
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306 unbundler.params |
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307 iterparts = unbundler.iterparts() |
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308 part = None |
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309 try: |
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310 for part in iterparts: |
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311 _processpart(op, part) |
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312 except Exception, exc: |
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313 for part in iterparts: |
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314 # consume the bundle content |
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315 part.read() |
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316 # Small hack to let caller code distinguish exceptions from bundle2 |
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317 # processing from processing the old format. This is mostly |
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318 # needed to handle different return codes to unbundle according to the |
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319 # type of bundle. We should probably clean up or drop this return code |
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320 # craziness in a future version. |
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321 exc.duringunbundle2 = True |
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322 raise |
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323 return op |
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324 |
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325 def _processpart(op, part): |
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326 """process a single part from a bundle |
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327 |
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328 The part is guaranteed to have been fully consumed when the function exits |
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329 (even if an exception is raised).""" |
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330 try: |
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331 try: |
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332 handler = parthandlermapping.get(part.type) |
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333 if handler is None: |
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334 raise error.UnsupportedPartError(parttype=part.type) |
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335 op.ui.debug('found a handler for part %r\n' % part.type) |
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336 unknownparams = part.mandatorykeys - handler.params |
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337 if unknownparams: |
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338 unknownparams = list(unknownparams) |
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339 unknownparams.sort() |
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340 raise error.UnsupportedPartError(parttype=part.type, |
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341 params=unknownparams) |
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342 except error.UnsupportedPartError, exc: |
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343 if part.mandatory: # mandatory parts |
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344 raise |
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345 op.ui.debug('ignoring unsupported advisory part %s\n' % exc) |
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346 return # skip to part processing |
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347 |
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348 # handler is called outside the above try block so that we don't |
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349 # risk catching KeyErrors from anything other than the |
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350 # parthandlermapping lookup (any KeyError raised by handler() |
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351 # itself represents a defect of a different variety). |
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352 output = None |
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353 if op.reply is not None: |
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354 op.ui.pushbuffer(error=True) |
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355 output = '' |
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356 try: |
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357 handler(op, part) |
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358 finally: |
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359 if output is not None: |
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360 output = op.ui.popbuffer() |
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361 if output: |
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362 outpart = op.reply.newpart('b2x:output', data=output, |
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363 mandatory=False) |
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364 outpart.addparam('in-reply-to', str(part.id), mandatory=False) |
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365 finally: |
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366 # consume the part content to not corrupt the stream. |
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367 part.read() |
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368 |
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369 |
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370 def decodecaps(blob): |
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371 """decode a bundle2 caps bytes blob into a dictionary |
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372 |
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373 The blob is a list of capabilities (one per line) |
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374 Capabilities may have values using a line of the form:: |
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375 |
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376 capability=value1,value2,value3 |
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377 |
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378 The values are always a list.""" |
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379 caps = {} |
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380 for line in blob.splitlines(): |
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381 if not line: |
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382 continue |
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383 if '=' not in line: |
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384 key, vals = line, () |
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385 else: |
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386 key, vals = line.split('=', 1) |
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387 vals = vals.split(',') |
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388 key = urllib.unquote(key) |
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389 vals = [urllib.unquote(v) for v in vals] |
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390 caps[key] = vals |
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391 return caps |
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392 |
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393 def encodecaps(caps): |
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394 """encode a bundle2 caps dictionary into a bytes blob""" |
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395 chunks = [] |
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396 for ca in sorted(caps): |
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397 vals = caps[ca] |
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398 ca = urllib.quote(ca) |
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399 vals = [urllib.quote(v) for v in vals] |
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400 if vals: |
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401 ca = "%s=%s" % (ca, ','.join(vals)) |
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402 chunks.append(ca) |
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403 return '\n'.join(chunks) |
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404 |
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405 class bundle20(object): |
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406 """represent an outgoing bundle2 container |
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407 |
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408 Use the `addparam` method to add stream level parameter. and `newpart` to |
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409 populate it. Then call `getchunks` to retrieve all the binary chunks of |
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410 data that compose the bundle2 container.""" |
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411 |
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412 def __init__(self, ui, capabilities=()): |
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413 self.ui = ui |
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414 self._params = [] |
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415 self._parts = [] |
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416 self.capabilities = dict(capabilities) |
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417 |
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418 @property |
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419 def nbparts(self): |
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420 """total number of parts added to the bundler""" |
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421 return len(self._parts) |
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422 |
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423 # methods used to defines the bundle2 content |
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424 def addparam(self, name, value=None): |
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425 """add a stream level parameter""" |
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426 if not name: |
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427 raise ValueError('empty parameter name') |
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428 if name[0] not in string.letters: |
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429 raise ValueError('non letter first character: %r' % name) |
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430 self._params.append((name, value)) |
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431 |
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432 def addpart(self, part): |
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433 """add a new part to the bundle2 container |
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434 |
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435 Parts contains the actual applicative payload.""" |
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436 assert part.id is None |
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437 part.id = len(self._parts) # very cheap counter |
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438 self._parts.append(part) |
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439 |
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440 def newpart(self, typeid, *args, **kwargs): |
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441 """create a new part and add it to the containers |
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442 |
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443 As the part is directly added to the containers. For now, this means |
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444 that any failure to properly initialize the part after calling |
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445 ``newpart`` should result in a failure of the whole bundling process. |
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446 |
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447 You can still fall back to manually create and add if you need better |
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448 control.""" |
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449 part = bundlepart(typeid, *args, **kwargs) |
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450 self.addpart(part) |
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451 return part |
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452 |
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453 # methods used to generate the bundle2 stream |
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454 def getchunks(self): |
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455 self.ui.debug('start emission of %s stream\n' % _magicstring) |
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456 yield _magicstring |
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457 param = self._paramchunk() |
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458 self.ui.debug('bundle parameter: %s\n' % param) |
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459 yield _pack(_fstreamparamsize, len(param)) |
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460 if param: |
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461 yield param |
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462 |
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463 self.ui.debug('start of parts\n') |
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464 for part in self._parts: |
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465 self.ui.debug('bundle part: "%s"\n' % part.type) |
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466 for chunk in part.getchunks(): |
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467 yield chunk |
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468 self.ui.debug('end of bundle\n') |
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469 yield _pack(_fpartheadersize, 0) |
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470 |
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471 def _paramchunk(self): |
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472 """return a encoded version of all stream parameters""" |
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473 blocks = [] |
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474 for par, value in self._params: |
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475 par = urllib.quote(par) |
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476 if value is not None: |
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477 value = urllib.quote(value) |
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478 par = '%s=%s' % (par, value) |
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479 blocks.append(par) |
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480 return ' '.join(blocks) |
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481 |
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482 class unpackermixin(object): |
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483 """A mixin to extract bytes and struct data from a stream""" |
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484 |
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485 def __init__(self, fp): |
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486 self._fp = fp |
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487 |
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488 def _unpack(self, format): |
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489 """unpack this struct format from the stream""" |
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490 data = self._readexact(struct.calcsize(format)) |
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491 return _unpack(format, data) |
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492 |
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493 def _readexact(self, size): |
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494 """read exactly <size> bytes from the stream""" |
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495 return changegroup.readexactly(self._fp, size) |
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496 |
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497 |
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498 class unbundle20(unpackermixin): |
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499 """interpret a bundle2 stream |
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500 |
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501 This class is fed with a binary stream and yields parts through its |
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502 `iterparts` methods.""" |
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503 |
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504 def __init__(self, ui, fp, header=None): |
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505 """If header is specified, we do not read it out of the stream.""" |
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506 self.ui = ui |
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507 super(unbundle20, self).__init__(fp) |
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508 if header is None: |
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509 header = self._readexact(4) |
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510 magic, version = header[0:2], header[2:4] |
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511 if magic != 'HG': |
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512 raise util.Abort(_('not a Mercurial bundle')) |
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513 if version != '2Y': |
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514 raise util.Abort(_('unknown bundle version %s') % version) |
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515 self.ui.debug('start processing of %s stream\n' % header) |
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516 |
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517 @util.propertycache |
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518 def params(self): |
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519 """dictionary of stream level parameters""" |
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520 self.ui.debug('reading bundle2 stream parameters\n') |
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521 params = {} |
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522 paramssize = self._unpack(_fstreamparamsize)[0] |
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523 if paramssize < 0: |
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524 raise error.BundleValueError('negative bundle param size: %i' |
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525 % paramssize) |
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526 if paramssize: |
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527 for p in self._readexact(paramssize).split(' '): |
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528 p = p.split('=', 1) |
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529 p = [urllib.unquote(i) for i in p] |
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530 if len(p) < 2: |
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531 p.append(None) |
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532 self._processparam(*p) |
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533 params[p[0]] = p[1] |
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534 return params |
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535 |
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536 def _processparam(self, name, value): |
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537 """process a parameter, applying its effect if needed |
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538 |
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539 Parameter starting with a lower case letter are advisory and will be |
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540 ignored when unknown. Those starting with an upper case letter are |
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541 mandatory and will this function will raise a KeyError when unknown. |
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542 |
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543 Note: no option are currently supported. Any input will be either |
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544 ignored or failing. |
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545 """ |
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546 if not name: |
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547 raise ValueError('empty parameter name') |
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548 if name[0] not in string.letters: |
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549 raise ValueError('non letter first character: %r' % name) |
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550 # Some logic will be later added here to try to process the option for |
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551 # a dict of known parameter. |
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552 if name[0].islower(): |
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553 self.ui.debug("ignoring unknown parameter %r\n" % name) |
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554 else: |
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555 raise error.UnsupportedPartError(params=(name,)) |
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556 |
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557 |
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558 def iterparts(self): |
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559 """yield all parts contained in the stream""" |
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560 # make sure param have been loaded |
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561 self.params |
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562 self.ui.debug('start extraction of bundle2 parts\n') |
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563 headerblock = self._readpartheader() |
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564 while headerblock is not None: |
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565 part = unbundlepart(self.ui, headerblock, self._fp) |
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566 yield part |
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567 headerblock = self._readpartheader() |
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568 self.ui.debug('end of bundle2 stream\n') |
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569 |
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570 def _readpartheader(self): |
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571 """reads a part header size and return the bytes blob |
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572 |
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573 returns None if empty""" |
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574 headersize = self._unpack(_fpartheadersize)[0] |
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575 if headersize < 0: |
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576 raise error.BundleValueError('negative part header size: %i' |
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577 % headersize) |
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578 self.ui.debug('part header size: %i\n' % headersize) |
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579 if headersize: |
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580 return self._readexact(headersize) |
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581 return None |
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582 |
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583 |
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584 class bundlepart(object): |
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585 """A bundle2 part contains application level payload |
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586 |
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587 The part `type` is used to route the part to the application level |
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588 handler. |
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589 |
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590 The part payload is contained in ``part.data``. It could be raw bytes or a |
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591 generator of byte chunks. |
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592 |
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593 You can add parameters to the part using the ``addparam`` method. |
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594 Parameters can be either mandatory (default) or advisory. Remote side |
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595 should be able to safely ignore the advisory ones. |
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596 |
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597 Both data and parameters cannot be modified after the generation has begun. |
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598 """ |
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599 |
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600 def __init__(self, parttype, mandatoryparams=(), advisoryparams=(), |
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601 data='', mandatory=True): |
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602 validateparttype(parttype) |
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603 self.id = None |
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604 self.type = parttype |
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605 self._data = data |
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606 self._mandatoryparams = list(mandatoryparams) |
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607 self._advisoryparams = list(advisoryparams) |
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608 # checking for duplicated entries |
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609 self._seenparams = set() |
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610 for pname, __ in self._mandatoryparams + self._advisoryparams: |
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611 if pname in self._seenparams: |
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612 raise RuntimeError('duplicated params: %s' % pname) |
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613 self._seenparams.add(pname) |
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614 # status of the part's generation: |
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615 # - None: not started, |
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616 # - False: currently generated, |
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617 # - True: generation done. |
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618 self._generated = None |
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619 self.mandatory = mandatory |
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620 |
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621 # methods used to defines the part content |
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622 def __setdata(self, data): |
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623 if self._generated is not None: |
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624 raise error.ReadOnlyPartError('part is being generated') |
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625 self._data = data |
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626 def __getdata(self): |
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627 return self._data |
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628 data = property(__getdata, __setdata) |
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629 |
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630 @property |
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631 def mandatoryparams(self): |
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632 # make it an immutable tuple to force people through ``addparam`` |
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633 return tuple(self._mandatoryparams) |
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634 |
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635 @property |
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636 def advisoryparams(self): |
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637 # make it an immutable tuple to force people through ``addparam`` |
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638 return tuple(self._advisoryparams) |
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639 |
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640 def addparam(self, name, value='', mandatory=True): |
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641 if self._generated is not None: |
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642 raise error.ReadOnlyPartError('part is being generated') |
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643 if name in self._seenparams: |
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644 raise ValueError('duplicated params: %s' % name) |
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645 self._seenparams.add(name) |
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646 params = self._advisoryparams |
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647 if mandatory: |
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648 params = self._mandatoryparams |
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649 params.append((name, value)) |
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650 |
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651 # methods used to generates the bundle2 stream |
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652 def getchunks(self): |
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653 if self._generated is not None: |
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654 raise RuntimeError('part can only be consumed once') |
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655 self._generated = False |
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656 #### header |
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657 if self.mandatory: |
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658 parttype = self.type.upper() |
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659 else: |
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660 parttype = self.type.lower() |
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661 ## parttype |
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662 header = [_pack(_fparttypesize, len(parttype)), |
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663 parttype, _pack(_fpartid, self.id), |
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664 ] |
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665 ## parameters |
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666 # count |
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667 manpar = self.mandatoryparams |
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668 advpar = self.advisoryparams |
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669 header.append(_pack(_fpartparamcount, len(manpar), len(advpar))) |
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670 # size |
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671 parsizes = [] |
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672 for key, value in manpar: |
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673 parsizes.append(len(key)) |
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674 parsizes.append(len(value)) |
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675 for key, value in advpar: |
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676 parsizes.append(len(key)) |
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677 parsizes.append(len(value)) |
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678 paramsizes = _pack(_makefpartparamsizes(len(parsizes) / 2), *parsizes) |
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679 header.append(paramsizes) |
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680 # key, value |
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681 for key, value in manpar: |
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682 header.append(key) |
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683 header.append(value) |
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684 for key, value in advpar: |
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685 header.append(key) |
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686 header.append(value) |
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687 ## finalize header |
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688 headerchunk = ''.join(header) |
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689 yield _pack(_fpartheadersize, len(headerchunk)) |
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690 yield headerchunk |
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691 ## payload |
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692 try: |
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693 for chunk in self._payloadchunks(): |
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694 yield _pack(_fpayloadsize, len(chunk)) |
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695 yield chunk |
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696 except Exception, exc: |
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697 # backup exception data for later |
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698 exc_info = sys.exc_info() |
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699 msg = 'unexpected error: %s' % exc |
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700 interpart = bundlepart('b2x:error:abort', [('message', msg)], |
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701 mandatory=False) |
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702 interpart.id = 0 |
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703 yield _pack(_fpayloadsize, -1) |
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704 for chunk in interpart.getchunks(): |
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705 yield chunk |
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706 # abort current part payload |
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707 yield _pack(_fpayloadsize, 0) |
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708 raise exc_info[0], exc_info[1], exc_info[2] |
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709 # end of payload |
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710 yield _pack(_fpayloadsize, 0) |
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711 self._generated = True |
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712 |
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713 def _payloadchunks(self): |
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714 """yield chunks of a the part payload |
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715 |
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716 Exists to handle the different methods to provide data to a part.""" |
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717 # we only support fixed size data now. |
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718 # This will be improved in the future. |
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719 if util.safehasattr(self.data, 'next'): |
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720 buff = util.chunkbuffer(self.data) |
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721 chunk = buff.read(preferedchunksize) |
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722 while chunk: |
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723 yield chunk |
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724 chunk = buff.read(preferedchunksize) |
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725 elif len(self.data): |
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726 yield self.data |
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|
727 |
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|
728 |
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729 flaginterrupt = -1 |
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730 |
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731 class interrupthandler(unpackermixin): |
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732 """read one part and process it with restricted capability |
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733 |
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734 This allows to transmit exception raised on the producer size during part |
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735 iteration while the consumer is reading a part. |
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736 |
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737 Part processed in this manner only have access to a ui object,""" |
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738 |
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739 def __init__(self, ui, fp): |
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740 super(interrupthandler, self).__init__(fp) |
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741 self.ui = ui |
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742 |
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743 def _readpartheader(self): |
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744 """reads a part header size and return the bytes blob |
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745 |
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746 returns None if empty""" |
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747 headersize = self._unpack(_fpartheadersize)[0] |
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748 if headersize < 0: |
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749 raise error.BundleValueError('negative part header size: %i' |
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750 % headersize) |
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751 self.ui.debug('part header size: %i\n' % headersize) |
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752 if headersize: |
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753 return self._readexact(headersize) |
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754 return None |
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|
755 |
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756 def __call__(self): |
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757 self.ui.debug('bundle2 stream interruption, looking for a part.\n') |
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758 headerblock = self._readpartheader() |
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759 if headerblock is None: |
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760 self.ui.debug('no part found during interruption.\n') |
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761 return |
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762 part = unbundlepart(self.ui, headerblock, self._fp) |
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763 op = interruptoperation(self.ui) |
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|
764 _processpart(op, part) |
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|
765 |
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|
766 class interruptoperation(object): |
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|
767 """A limited operation to be use by part handler during interruption |
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768 |
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769 It only have access to an ui object. |
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770 """ |
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771 |
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772 def __init__(self, ui): |
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773 self.ui = ui |
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774 self.reply = None |
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775 |
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776 @property |
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777 def repo(self): |
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778 raise RuntimeError('no repo access from stream interruption') |
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779 |
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780 def gettransaction(self): |
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781 raise TransactionUnavailable('no repo access from stream interruption') |
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782 |
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783 class unbundlepart(unpackermixin): |
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784 """a bundle part read from a bundle""" |
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785 |
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786 def __init__(self, ui, header, fp): |
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787 super(unbundlepart, self).__init__(fp) |
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788 self.ui = ui |
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789 # unbundle state attr |
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790 self._headerdata = header |
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791 self._headeroffset = 0 |
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792 self._initialized = False |
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793 self.consumed = False |
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794 # part data |
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795 self.id = None |
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796 self.type = None |
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797 self.mandatoryparams = None |
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798 self.advisoryparams = None |
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799 self.params = None |
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800 self.mandatorykeys = () |
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801 self._payloadstream = None |
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802 self._readheader() |
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803 self._mandatory = None |
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804 |
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805 def _fromheader(self, size): |
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806 """return the next <size> byte from the header""" |
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807 offset = self._headeroffset |
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808 data = self._headerdata[offset:(offset + size)] |
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809 self._headeroffset = offset + size |
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810 return data |
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811 |
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812 def _unpackheader(self, format): |
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813 """read given format from header |
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814 |
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815 This automatically compute the size of the format to read.""" |
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816 data = self._fromheader(struct.calcsize(format)) |
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817 return _unpack(format, data) |
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818 |
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819 def _initparams(self, mandatoryparams, advisoryparams): |
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820 """internal function to setup all logic related parameters""" |
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821 # make it read only to prevent people touching it by mistake. |
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822 self.mandatoryparams = tuple(mandatoryparams) |
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823 self.advisoryparams = tuple(advisoryparams) |
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824 # user friendly UI |
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825 self.params = dict(self.mandatoryparams) |
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826 self.params.update(dict(self.advisoryparams)) |
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827 self.mandatorykeys = frozenset(p[0] for p in mandatoryparams) |
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828 |
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829 def _readheader(self): |
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830 """read the header and setup the object""" |
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831 typesize = self._unpackheader(_fparttypesize)[0] |
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832 self.type = self._fromheader(typesize) |
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833 self.ui.debug('part type: "%s"\n' % self.type) |
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834 self.id = self._unpackheader(_fpartid)[0] |
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835 self.ui.debug('part id: "%s"\n' % self.id) |
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836 # extract mandatory bit from type |
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837 self.mandatory = (self.type != self.type.lower()) |
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838 self.type = self.type.lower() |
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839 ## reading parameters |
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840 # param count |
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841 mancount, advcount = self._unpackheader(_fpartparamcount) |
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842 self.ui.debug('part parameters: %i\n' % (mancount + advcount)) |
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843 # param size |
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844 fparamsizes = _makefpartparamsizes(mancount + advcount) |
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845 paramsizes = self._unpackheader(fparamsizes) |
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846 # make it a list of couple again |
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847 paramsizes = zip(paramsizes[::2], paramsizes[1::2]) |
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848 # split mandatory from advisory |
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849 mansizes = paramsizes[:mancount] |
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850 advsizes = paramsizes[mancount:] |
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851 # retrieve param value |
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852 manparams = [] |
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853 for key, value in mansizes: |
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854 manparams.append((self._fromheader(key), self._fromheader(value))) |
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855 advparams = [] |
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856 for key, value in advsizes: |
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857 advparams.append((self._fromheader(key), self._fromheader(value))) |
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858 self._initparams(manparams, advparams) |
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859 ## part payload |
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860 def payloadchunks(): |
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861 payloadsize = self._unpack(_fpayloadsize)[0] |
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862 self.ui.debug('payload chunk size: %i\n' % payloadsize) |
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863 while payloadsize: |
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864 if payloadsize == flaginterrupt: |
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865 # interruption detection, the handler will now read a |
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866 # single part and process it. |
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867 interrupthandler(self.ui, self._fp)() |
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868 elif payloadsize < 0: |
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869 msg = 'negative payload chunk size: %i' % payloadsize |
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870 raise error.BundleValueError(msg) |
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871 else: |
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872 yield self._readexact(payloadsize) |
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873 payloadsize = self._unpack(_fpayloadsize)[0] |
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874 self.ui.debug('payload chunk size: %i\n' % payloadsize) |
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875 self._payloadstream = util.chunkbuffer(payloadchunks()) |
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876 # we read the data, tell it |
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877 self._initialized = True |
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878 |
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879 def read(self, size=None): |
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880 """read payload data""" |
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881 if not self._initialized: |
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882 self._readheader() |
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883 if size is None: |
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884 data = self._payloadstream.read() |
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885 else: |
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886 data = self._payloadstream.read(size) |
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887 if size is None or len(data) < size: |
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888 self.consumed = True |
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889 return data |
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890 |
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891 capabilities = {'HG2Y': (), |
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892 'b2x:listkeys': (), |
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893 'b2x:pushkey': (), |
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894 'digests': tuple(sorted(util.DIGESTS.keys())), |
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895 'b2x:remote-changegroup': ('http', 'https'), |
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896 } |
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897 |
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898 def getrepocaps(repo, allowpushback=False): |
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899 """return the bundle2 capabilities for a given repo |
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900 |
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901 Exists to allow extensions (like evolution) to mutate the capabilities. |
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902 """ |
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903 caps = capabilities.copy() |
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904 caps['b2x:changegroup'] = tuple(sorted(changegroup.packermap.keys())) |
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905 if obsolete.isenabled(repo, obsolete.exchangeopt): |
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906 supportedformat = tuple('V%i' % v for v in obsolete.formats) |
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907 caps['b2x:obsmarkers'] = supportedformat |
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908 if allowpushback: |
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909 caps['b2x:pushback'] = () |
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910 return caps |
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911 |
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912 def bundle2caps(remote): |
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913 """return the bundle capabilities of a peer as dict""" |
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914 raw = remote.capable('bundle2-exp') |
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915 if not raw and raw != '': |
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916 return {} |
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917 capsblob = urllib.unquote(remote.capable('bundle2-exp')) |
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918 return decodecaps(capsblob) |
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919 |
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920 def obsmarkersversion(caps): |
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921 """extract the list of supported obsmarkers versions from a bundle2caps dict |
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922 """ |
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923 obscaps = caps.get('b2x:obsmarkers', ()) |
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924 return [int(c[1:]) for c in obscaps if c.startswith('V')] |
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925 |
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926 @parthandler('b2x:changegroup', ('version',)) |
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927 def handlechangegroup(op, inpart): |
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928 """apply a changegroup part on the repo |
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929 |
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930 This is a very early implementation that will massive rework before being |
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931 inflicted to any end-user. |
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932 """ |
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933 # Make sure we trigger a transaction creation |
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934 # |
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935 # The addchangegroup function will get a transaction object by itself, but |
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936 # we need to make sure we trigger the creation of a transaction object used |
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937 # for the whole processing scope. |
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938 op.gettransaction() |
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939 unpackerversion = inpart.params.get('version', '01') |
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940 # We should raise an appropriate exception here |
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941 unpacker = changegroup.packermap[unpackerversion][1] |
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|
942 cg = unpacker(inpart, 'UN') |
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943 # the source and url passed here are overwritten by the one contained in |
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944 # the transaction.hookargs argument. So 'bundle2' is a placeholder |
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945 ret = changegroup.addchangegroup(op.repo, cg, 'bundle2', 'bundle2') |
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|
946 op.records.add('changegroup', {'return': ret}) |
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947 if op.reply is not None: |
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948 # This is definitely not the final form of this |
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949 # return. But one need to start somewhere. |
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|
950 part = op.reply.newpart('b2x:reply:changegroup', mandatory=False) |
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|
951 part.addparam('in-reply-to', str(inpart.id), mandatory=False) |
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952 part.addparam('return', '%i' % ret, mandatory=False) |
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953 assert not inpart.read() |
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954 |
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955 _remotechangegroupparams = tuple(['url', 'size', 'digests'] + |
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956 ['digest:%s' % k for k in util.DIGESTS.keys()]) |
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957 @parthandler('b2x:remote-changegroup', _remotechangegroupparams) |
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958 def handleremotechangegroup(op, inpart): |
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959 """apply a bundle10 on the repo, given an url and validation information |
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960 |
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961 All the information about the remote bundle to import are given as |
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962 parameters. The parameters include: |
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|
963 - url: the url to the bundle10. |
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964 - size: the bundle10 file size. It is used to validate what was |
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|
965 retrieved by the client matches the server knowledge about the bundle. |
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966 - digests: a space separated list of the digest types provided as |
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|
967 parameters. |
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|
968 - digest:<digest-type>: the hexadecimal representation of the digest with |
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|
969 that name. Like the size, it is used to validate what was retrieved by |
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970 the client matches what the server knows about the bundle. |
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|
971 |
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|
972 When multiple digest types are given, all of them are checked. |
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|
973 """ |
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|
974 try: |
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|
975 raw_url = inpart.params['url'] |
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|
976 except KeyError: |
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|
977 raise util.Abort(_('remote-changegroup: missing "%s" param') % 'url') |
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|
978 parsed_url = util.url(raw_url) |
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|
979 if parsed_url.scheme not in capabilities['b2x:remote-changegroup']: |
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980 raise util.Abort(_('remote-changegroup does not support %s urls') % |
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981 parsed_url.scheme) |
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982 |
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983 try: |
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984 size = int(inpart.params['size']) |
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985 except ValueError: |
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986 raise util.Abort(_('remote-changegroup: invalid value for param "%s"') |
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987 % 'size') |
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988 except KeyError: |
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989 raise util.Abort(_('remote-changegroup: missing "%s" param') % 'size') |
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990 |
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991 digests = {} |
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992 for typ in inpart.params.get('digests', '').split(): |
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993 param = 'digest:%s' % typ |
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994 try: |
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995 value = inpart.params[param] |
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996 except KeyError: |
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997 raise util.Abort(_('remote-changegroup: missing "%s" param') % |
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998 param) |
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999 digests[typ] = value |
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1000 |
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1001 real_part = util.digestchecker(url.open(op.ui, raw_url), size, digests) |
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1002 |
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1003 # Make sure we trigger a transaction creation |
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1004 # |
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1005 # The addchangegroup function will get a transaction object by itself, but |
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1006 # we need to make sure we trigger the creation of a transaction object used |
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1007 # for the whole processing scope. |
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1008 op.gettransaction() |
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1009 import exchange |
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1010 cg = exchange.readbundle(op.repo.ui, real_part, raw_url) |
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1011 if not isinstance(cg, changegroup.cg1unpacker): |
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1012 raise util.Abort(_('%s: not a bundle version 1.0') % |
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1013 util.hidepassword(raw_url)) |
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1014 ret = changegroup.addchangegroup(op.repo, cg, 'bundle2', 'bundle2') |
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1015 op.records.add('changegroup', {'return': ret}) |
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1016 if op.reply is not None: |
23139
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1017 # This is definitely not the final form of this |
23029
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1018 # return. But one need to start somewhere. |
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1019 part = op.reply.newpart('b2x:reply:changegroup') |
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1020 part.addparam('in-reply-to', str(inpart.id), mandatory=False) |
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1021 part.addparam('return', '%i' % ret, mandatory=False) |
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1022 try: |
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1023 real_part.validate() |
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1024 except util.Abort, e: |
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1025 raise util.Abort(_('bundle at %s is corrupted:\n%s') % |
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1026 (util.hidepassword(raw_url), str(e))) |
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1027 assert not inpart.read() |
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1028 |
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1029 @parthandler('b2x:reply:changegroup', ('return', 'in-reply-to')) |
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1030 def handlereplychangegroup(op, inpart): |
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1031 ret = int(inpart.params['return']) |
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1032 replyto = int(inpart.params['in-reply-to']) |
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1033 op.records.add('changegroup', {'return': ret}, replyto) |
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1034 |
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1035 @parthandler('b2x:check:heads') |
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1036 def handlecheckheads(op, inpart): |
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1037 """check that head of the repo did not change |
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1038 |
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1039 This is used to detect a push race when using unbundle. |
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1040 This replaces the "heads" argument of unbundle.""" |
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1041 h = inpart.read(20) |
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1042 heads = [] |
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1043 while len(h) == 20: |
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1044 heads.append(h) |
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1045 h = inpart.read(20) |
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1046 assert not h |
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1047 if heads != op.repo.heads(): |
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|
1048 raise error.PushRaced('repository changed while pushing - ' |
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|
1049 'please try again') |
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1050 |
21146
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1051 @parthandler('b2x:output') |
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1052 def handleoutput(op, inpart): |
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1053 """forward output captured on the server to the client""" |
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1054 for line in inpart.read().splitlines(): |
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1055 op.ui.write(('remote: %s\n' % line)) |
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1056 |
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1057 @parthandler('b2x:replycaps') |
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1058 def handlereplycaps(op, inpart): |
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1059 """Notify that a reply bundle should be created |
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|
1060 |
21138
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|
1061 The payload contains the capabilities information for the reply""" |
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diff
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|
1062 caps = decodecaps(inpart.read()) |
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|
1063 if op.reply is None: |
21135
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21134
diff
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|
1064 op.reply = bundle20(op.ui, caps) |
21131
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|
1065 |
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|
1066 @parthandler('b2x:error:abort', ('message', 'hint')) |
21177
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21176
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|
1067 def handlereplycaps(op, inpart): |
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diff
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|
1068 """Used to transmit abort error over the wire""" |
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|
1069 raise util.Abort(inpart.params['message'], hint=inpart.params.get('hint')) |
21183
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|
1070 |
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|
1071 @parthandler('b2x:error:unsupportedcontent', ('parttype', 'params')) |
21183
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|
1072 def handlereplycaps(op, inpart): |
21619
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Pierre-Yves David <pierre-yves.david@fb.com>
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21618
diff
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|
1073 """Used to transmit unknown content error over the wire""" |
21622
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21620
diff
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|
1074 kwargs = {} |
21627
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|
1075 parttype = inpart.params.get('parttype') |
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|
1076 if parttype is not None: |
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|
1077 kwargs['parttype'] = parttype |
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|
1078 params = inpart.params.get('params') |
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|
1079 if params is not None: |
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|
1080 kwargs['params'] = params.split('\0') |
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|
1081 |
23010
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diff
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|
1082 raise error.UnsupportedPartError(**kwargs) |
21186
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|
1083 |
21623
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21622
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|
1084 @parthandler('b2x:error:pushraced', ('message',)) |
21186
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|
1085 def handlereplycaps(op, inpart): |
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|
1086 """Used to transmit push race error over the wire""" |
21611
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diff
changeset
|
1087 raise error.ResponseError(_('push failed:'), inpart.params['message']) |
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1088 |
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1089 @parthandler('b2x:listkeys', ('namespace',)) |
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1090 def handlelistkeys(op, inpart): |
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1091 """retrieve pushkey namespace content stored in a bundle2""" |
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1092 namespace = inpart.params['namespace'] |
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1093 r = pushkey.decodekeys(inpart.read()) |
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1094 op.records.add('listkeys', (namespace, r)) |
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1095 |
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1096 @parthandler('b2x:pushkey', ('namespace', 'key', 'old', 'new')) |
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1097 def handlepushkey(op, inpart): |
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1098 """process a pushkey request""" |
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1099 dec = pushkey.decode |
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1100 namespace = dec(inpart.params['namespace']) |
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1101 key = dec(inpart.params['key']) |
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1102 old = dec(inpart.params['old']) |
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1103 new = dec(inpart.params['new']) |
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1104 ret = op.repo.pushkey(namespace, key, old, new) |
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1105 record = {'namespace': namespace, |
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1106 'key': key, |
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1107 'old': old, |
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1108 'new': new} |
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1109 op.records.add('pushkey', record) |
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1110 if op.reply is not None: |
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1111 rpart = op.reply.newpart('b2x:reply:pushkey') |
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1112 rpart.addparam('in-reply-to', str(inpart.id), mandatory=False) |
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1113 rpart.addparam('return', '%i' % ret, mandatory=False) |
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1114 |
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1115 @parthandler('b2x:reply:pushkey', ('return', 'in-reply-to')) |
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1116 def handlepushkeyreply(op, inpart): |
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1117 """retrieve the result of a pushkey request""" |
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1118 ret = int(inpart.params['return']) |
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1119 partid = int(inpart.params['in-reply-to']) |
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1120 op.records.add('pushkey', {'return': ret}, partid) |
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1121 |
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1122 @parthandler('b2x:obsmarkers') |
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1123 def handleobsmarker(op, inpart): |
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1124 """add a stream of obsmarkers to the repo""" |
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1125 tr = op.gettransaction() |
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1126 new = op.repo.obsstore.mergemarkers(tr, inpart.read()) |
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1127 if new: |
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1128 op.repo.ui.status(_('%i new obsolescence markers\n') % new) |
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1129 op.records.add('obsmarkers', {'new': new}) |
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1130 if op.reply is not None: |
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1131 rpart = op.reply.newpart('b2x:reply:obsmarkers') |
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1132 rpart.addparam('in-reply-to', str(inpart.id), mandatory=False) |
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1133 rpart.addparam('new', '%i' % new, mandatory=False) |
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1134 |
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1135 |
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1136 @parthandler('b2x:reply:obsmarkers', ('new', 'in-reply-to')) |
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1137 def handlepushkeyreply(op, inpart): |
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1138 """retrieve the result of a pushkey request""" |
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1139 ret = int(inpart.params['new']) |
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1140 partid = int(inpart.params['in-reply-to']) |
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1141 op.records.add('obsmarkers', {'new': ret}, partid) |