Mercurial > hg
annotate mercurial/bundle2.py @ 23324:69f86b937035
cmdserver: protect pipe server streams against corruption caused by direct io
Because pipe-mode server uses stdio as IPC channel, other modules should not
touch stdio directly and use ui instead. However, this strategy is brittle
because several Python functions read and write stdio implicitly.
print 'hello' # should use ui.write()
# => ch = 'h', size = 1701604463 'ello', data = '\n'
This patch adds protection for such mistakes. Both stdio files and low-level
file descriptors are redirected to /dev/null while command server uses them.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sat, 15 Nov 2014 13:50:43 +0900 |
parents | ca38764e2f38 |
children | 6e0ecb9a2e19 |
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 |
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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 |
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157 import changegroup, error |
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158 from i18n import _ |
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159 |
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160 _pack = struct.pack |
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161 _unpack = struct.unpack |
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162 |
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163 _magicstring = 'HG2Y' |
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164 |
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165 _fstreamparamsize = '>i' |
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166 _fpartheadersize = '>i' |
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167 _fparttypesize = '>B' |
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168 _fpartid = '>I' |
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169 _fpayloadsize = '>i' |
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170 _fpartparamcount = '>BB' |
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171 |
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172 preferedchunksize = 4096 |
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173 |
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174 def _makefpartparamsizes(nbparams): |
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175 """return a struct format to read part parameter sizes |
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176 |
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177 The number parameters is variable so we need to build that format |
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178 dynamically. |
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179 """ |
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180 return '>'+('BB'*nbparams) |
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181 |
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182 parthandlermapping = {} |
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183 |
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184 def parthandler(parttype, params=()): |
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185 """decorator that register a function as a bundle2 part handler |
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186 |
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187 eg:: |
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188 |
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189 @parthandler('myparttype', ('mandatory', 'param', 'handled')) |
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190 def myparttypehandler(...): |
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191 '''process a part of type "my part".''' |
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192 ... |
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193 """ |
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194 def _decorator(func): |
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195 lparttype = parttype.lower() # enforce lower case matching. |
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196 assert lparttype not in parthandlermapping |
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197 parthandlermapping[lparttype] = func |
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198 func.params = frozenset(params) |
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199 return func |
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200 return _decorator |
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201 |
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202 class unbundlerecords(object): |
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203 """keep record of what happens during and unbundle |
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204 |
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205 New records are added using `records.add('cat', obj)`. Where 'cat' is a |
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206 category of record and obj is an arbitrary object. |
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207 |
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208 `records['cat']` will return all entries of this category 'cat'. |
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209 |
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210 Iterating on the object itself will yield `('category', obj)` tuples |
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211 for all entries. |
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212 |
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213 All iterations happens in chronological order. |
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214 """ |
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215 |
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216 def __init__(self): |
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217 self._categories = {} |
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218 self._sequences = [] |
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219 self._replies = {} |
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220 |
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221 def add(self, category, entry, inreplyto=None): |
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222 """add a new record of a given category. |
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223 |
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224 The entry can then be retrieved in the list returned by |
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225 self['category'].""" |
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226 self._categories.setdefault(category, []).append(entry) |
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227 self._sequences.append((category, entry)) |
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228 if inreplyto is not None: |
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229 self.getreplies(inreplyto).add(category, entry) |
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230 |
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231 def getreplies(self, partid): |
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232 """get the records that are replies to a specific part""" |
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233 return self._replies.setdefault(partid, unbundlerecords()) |
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234 |
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235 def __getitem__(self, cat): |
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236 return tuple(self._categories.get(cat, ())) |
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237 |
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238 def __iter__(self): |
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239 return iter(self._sequences) |
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240 |
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241 def __len__(self): |
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242 return len(self._sequences) |
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243 |
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244 def __nonzero__(self): |
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245 return bool(self._sequences) |
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246 |
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247 class bundleoperation(object): |
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248 """an object that represents a single bundling process |
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249 |
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250 Its purpose is to carry unbundle-related objects and states. |
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251 |
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252 A new object should be created at the beginning of each bundle processing. |
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253 The object is to be returned by the processing function. |
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254 |
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255 The object has very little content now it will ultimately contain: |
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256 * an access to the repo the bundle is applied to, |
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257 * a ui object, |
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258 * a way to retrieve a transaction to add changes to the repo, |
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259 * a way to record the result of processing each part, |
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260 * a way to construct a bundle response when applicable. |
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261 """ |
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262 |
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263 def __init__(self, repo, transactiongetter): |
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264 self.repo = repo |
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265 self.ui = repo.ui |
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266 self.records = unbundlerecords() |
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267 self.gettransaction = transactiongetter |
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268 self.reply = None |
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269 |
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270 class TransactionUnavailable(RuntimeError): |
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271 pass |
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272 |
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273 def _notransaction(): |
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274 """default method to get a transaction while processing a bundle |
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275 |
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276 Raise an exception to highlight the fact that no transaction was expected |
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277 to be created""" |
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278 raise TransactionUnavailable() |
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279 |
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280 def processbundle(repo, unbundler, transactiongetter=_notransaction): |
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281 """This function process a bundle, apply effect to/from a repo |
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282 |
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283 It iterates over each part then searches for and uses the proper handling |
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284 code to process the part. Parts are processed in order. |
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285 |
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286 This is very early version of this function that will be strongly reworked |
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287 before final usage. |
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288 |
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289 Unknown Mandatory part will abort the process. |
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290 """ |
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291 op = bundleoperation(repo, transactiongetter) |
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292 # todo: |
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293 # - replace this is a init function soon. |
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294 # - exception catching |
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295 unbundler.params |
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296 iterparts = unbundler.iterparts() |
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297 part = None |
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298 try: |
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299 for part in iterparts: |
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300 _processpart(op, part) |
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301 except Exception, exc: |
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302 for part in iterparts: |
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303 # consume the bundle content |
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304 part.read() |
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305 # Small hack to let caller code distinguish exceptions from bundle2 |
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306 # processing from processing the old format. This is mostly |
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307 # needed to handle different return codes to unbundle according to the |
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308 # type of bundle. We should probably clean up or drop this return code |
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309 # craziness in a future version. |
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310 exc.duringunbundle2 = True |
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311 raise |
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312 return op |
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313 |
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314 def _processpart(op, part): |
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315 """process a single part from a bundle |
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316 |
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317 The part is guaranteed to have been fully consumed when the function exits |
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318 (even if an exception is raised).""" |
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319 try: |
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320 parttype = part.type |
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321 # part key are matched lower case |
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322 key = parttype.lower() |
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323 try: |
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324 handler = parthandlermapping.get(key) |
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325 if handler is None: |
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326 raise error.UnsupportedPartError(parttype=key) |
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327 op.ui.debug('found a handler for part %r\n' % parttype) |
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328 unknownparams = part.mandatorykeys - handler.params |
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329 if unknownparams: |
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330 unknownparams = list(unknownparams) |
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331 unknownparams.sort() |
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332 raise error.UnsupportedPartError(parttype=key, |
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333 params=unknownparams) |
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334 except error.UnsupportedPartError, exc: |
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335 if key != parttype: # mandatory parts |
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336 raise |
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337 op.ui.debug('ignoring unsupported advisory part %s\n' % exc) |
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338 return # skip to part processing |
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339 |
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340 # handler is called outside the above try block so that we don't |
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341 # risk catching KeyErrors from anything other than the |
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342 # parthandlermapping lookup (any KeyError raised by handler() |
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343 # itself represents a defect of a different variety). |
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344 output = None |
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345 if op.reply is not None: |
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346 op.ui.pushbuffer(error=True) |
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347 output = '' |
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348 try: |
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349 handler(op, part) |
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350 finally: |
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351 if output is not None: |
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352 output = op.ui.popbuffer() |
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353 if output: |
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354 outpart = op.reply.newpart('b2x:output', data=output) |
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355 outpart.addparam('in-reply-to', str(part.id), mandatory=False) |
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356 finally: |
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357 # consume the part content to not corrupt the stream. |
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358 part.read() |
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359 |
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360 |
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361 def decodecaps(blob): |
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362 """decode a bundle2 caps bytes blob into a dictionary |
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363 |
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364 The blob is a list of capabilities (one per line) |
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365 Capabilities may have values using a line of the form:: |
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366 |
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367 capability=value1,value2,value3 |
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368 |
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369 The values are always a list.""" |
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370 caps = {} |
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371 for line in blob.splitlines(): |
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372 if not line: |
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373 continue |
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374 if '=' not in line: |
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375 key, vals = line, () |
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376 else: |
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377 key, vals = line.split('=', 1) |
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378 vals = vals.split(',') |
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379 key = urllib.unquote(key) |
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380 vals = [urllib.unquote(v) for v in vals] |
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381 caps[key] = vals |
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382 return caps |
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383 |
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384 def encodecaps(caps): |
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385 """encode a bundle2 caps dictionary into a bytes blob""" |
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386 chunks = [] |
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387 for ca in sorted(caps): |
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388 vals = caps[ca] |
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389 ca = urllib.quote(ca) |
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390 vals = [urllib.quote(v) for v in vals] |
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391 if vals: |
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392 ca = "%s=%s" % (ca, ','.join(vals)) |
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393 chunks.append(ca) |
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394 return '\n'.join(chunks) |
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395 |
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396 class bundle20(object): |
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397 """represent an outgoing bundle2 container |
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398 |
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399 Use the `addparam` method to add stream level parameter. and `newpart` to |
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400 populate it. Then call `getchunks` to retrieve all the binary chunks of |
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401 data that compose the bundle2 container.""" |
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402 |
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403 def __init__(self, ui, capabilities=()): |
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404 self.ui = ui |
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405 self._params = [] |
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406 self._parts = [] |
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407 self.capabilities = dict(capabilities) |
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408 |
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409 @property |
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410 def nbparts(self): |
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411 """total number of parts added to the bundler""" |
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412 return len(self._parts) |
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413 |
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414 # methods used to defines the bundle2 content |
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415 def addparam(self, name, value=None): |
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416 """add a stream level parameter""" |
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417 if not name: |
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418 raise ValueError('empty parameter name') |
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419 if name[0] not in string.letters: |
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420 raise ValueError('non letter first character: %r' % name) |
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421 self._params.append((name, value)) |
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422 |
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423 def addpart(self, part): |
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424 """add a new part to the bundle2 container |
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425 |
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426 Parts contains the actual applicative payload.""" |
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427 assert part.id is None |
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428 part.id = len(self._parts) # very cheap counter |
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429 self._parts.append(part) |
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430 |
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431 def newpart(self, typeid, *args, **kwargs): |
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432 """create a new part and add it to the containers |
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433 |
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434 As the part is directly added to the containers. For now, this means |
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435 that any failure to properly initialize the part after calling |
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436 ``newpart`` should result in a failure of the whole bundling process. |
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437 |
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438 You can still fall back to manually create and add if you need better |
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439 control.""" |
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440 part = bundlepart(typeid, *args, **kwargs) |
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441 self.addpart(part) |
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442 return part |
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443 |
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444 # methods used to generate the bundle2 stream |
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445 def getchunks(self): |
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446 self.ui.debug('start emission of %s stream\n' % _magicstring) |
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447 yield _magicstring |
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448 param = self._paramchunk() |
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449 self.ui.debug('bundle parameter: %s\n' % param) |
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450 yield _pack(_fstreamparamsize, len(param)) |
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451 if param: |
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452 yield param |
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453 |
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454 self.ui.debug('start of parts\n') |
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455 for part in self._parts: |
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456 self.ui.debug('bundle part: "%s"\n' % part.type) |
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457 for chunk in part.getchunks(): |
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458 yield chunk |
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459 self.ui.debug('end of bundle\n') |
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460 yield _pack(_fpartheadersize, 0) |
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461 |
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462 def _paramchunk(self): |
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463 """return a encoded version of all stream parameters""" |
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464 blocks = [] |
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465 for par, value in self._params: |
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466 par = urllib.quote(par) |
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467 if value is not None: |
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468 value = urllib.quote(value) |
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469 par = '%s=%s' % (par, value) |
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470 blocks.append(par) |
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471 return ' '.join(blocks) |
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472 |
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473 class unpackermixin(object): |
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474 """A mixin to extract bytes and struct data from a stream""" |
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475 |
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476 def __init__(self, fp): |
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477 self._fp = fp |
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478 |
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479 def _unpack(self, format): |
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480 """unpack this struct format from the stream""" |
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481 data = self._readexact(struct.calcsize(format)) |
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482 return _unpack(format, data) |
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483 |
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484 def _readexact(self, size): |
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485 """read exactly <size> bytes from the stream""" |
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486 return changegroup.readexactly(self._fp, size) |
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487 |
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488 |
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489 class unbundle20(unpackermixin): |
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490 """interpret a bundle2 stream |
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491 |
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492 This class is fed with a binary stream and yields parts through its |
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493 `iterparts` methods.""" |
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494 |
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495 def __init__(self, ui, fp, header=None): |
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496 """If header is specified, we do not read it out of the stream.""" |
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497 self.ui = ui |
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498 super(unbundle20, self).__init__(fp) |
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499 if header is None: |
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500 header = self._readexact(4) |
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501 magic, version = header[0:2], header[2:4] |
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502 if magic != 'HG': |
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503 raise util.Abort(_('not a Mercurial bundle')) |
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504 if version != '2Y': |
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505 raise util.Abort(_('unknown bundle version %s') % version) |
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506 self.ui.debug('start processing of %s stream\n' % header) |
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507 |
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508 @util.propertycache |
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509 def params(self): |
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510 """dictionary of stream level parameters""" |
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511 self.ui.debug('reading bundle2 stream parameters\n') |
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512 params = {} |
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513 paramssize = self._unpack(_fstreamparamsize)[0] |
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514 if paramssize < 0: |
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515 raise error.BundleValueError('negative bundle param size: %i' |
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516 % paramssize) |
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517 if paramssize: |
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518 for p in self._readexact(paramssize).split(' '): |
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519 p = p.split('=', 1) |
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520 p = [urllib.unquote(i) for i in p] |
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521 if len(p) < 2: |
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522 p.append(None) |
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523 self._processparam(*p) |
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524 params[p[0]] = p[1] |
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525 return params |
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526 |
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527 def _processparam(self, name, value): |
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528 """process a parameter, applying its effect if needed |
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529 |
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530 Parameter starting with a lower case letter are advisory and will be |
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531 ignored when unknown. Those starting with an upper case letter are |
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532 mandatory and will this function will raise a KeyError when unknown. |
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533 |
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534 Note: no option are currently supported. Any input will be either |
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|
535 ignored or failing. |
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536 """ |
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|
537 if not name: |
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538 raise ValueError('empty parameter name') |
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539 if name[0] not in string.letters: |
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540 raise ValueError('non letter first character: %r' % name) |
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541 # Some logic will be later added here to try to process the option for |
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542 # a dict of known parameter. |
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543 if name[0].islower(): |
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544 self.ui.debug("ignoring unknown parameter %r\n" % name) |
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545 else: |
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|
546 raise error.UnsupportedPartError(params=(name,)) |
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547 |
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548 |
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549 def iterparts(self): |
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550 """yield all parts contained in the stream""" |
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551 # make sure param have been loaded |
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552 self.params |
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553 self.ui.debug('start extraction of bundle2 parts\n') |
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554 headerblock = self._readpartheader() |
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555 while headerblock is not None: |
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556 part = unbundlepart(self.ui, headerblock, self._fp) |
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557 yield part |
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558 headerblock = self._readpartheader() |
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559 self.ui.debug('end of bundle2 stream\n') |
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560 |
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561 def _readpartheader(self): |
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562 """reads a part header size and return the bytes blob |
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563 |
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564 returns None if empty""" |
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565 headersize = self._unpack(_fpartheadersize)[0] |
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566 if headersize < 0: |
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567 raise error.BundleValueError('negative part header size: %i' |
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568 % headersize) |
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569 self.ui.debug('part header size: %i\n' % headersize) |
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570 if headersize: |
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571 return self._readexact(headersize) |
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572 return None |
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573 |
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574 |
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575 class bundlepart(object): |
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576 """A bundle2 part contains application level payload |
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577 |
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578 The part `type` is used to route the part to the application level |
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579 handler. |
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580 |
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581 The part payload is contained in ``part.data``. It could be raw bytes or a |
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582 generator of byte chunks. |
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583 |
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584 You can add parameters to the part using the ``addparam`` method. |
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585 Parameters can be either mandatory (default) or advisory. Remote side |
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586 should be able to safely ignore the advisory ones. |
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587 |
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588 Both data and parameters cannot be modified after the generation has begun. |
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589 """ |
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590 |
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591 def __init__(self, parttype, mandatoryparams=(), advisoryparams=(), |
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592 data=''): |
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593 self.id = None |
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594 self.type = parttype |
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595 self._data = data |
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596 self._mandatoryparams = list(mandatoryparams) |
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597 self._advisoryparams = list(advisoryparams) |
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598 # checking for duplicated entries |
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599 self._seenparams = set() |
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600 for pname, __ in self._mandatoryparams + self._advisoryparams: |
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601 if pname in self._seenparams: |
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602 raise RuntimeError('duplicated params: %s' % pname) |
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603 self._seenparams.add(pname) |
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604 # status of the part's generation: |
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605 # - None: not started, |
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606 # - False: currently generated, |
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607 # - True: generation done. |
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608 self._generated = None |
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609 |
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610 # methods used to defines the part content |
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611 def __setdata(self, data): |
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612 if self._generated is not None: |
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613 raise error.ReadOnlyPartError('part is being generated') |
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614 self._data = data |
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615 def __getdata(self): |
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616 return self._data |
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617 data = property(__getdata, __setdata) |
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618 |
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619 @property |
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620 def mandatoryparams(self): |
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621 # make it an immutable tuple to force people through ``addparam`` |
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622 return tuple(self._mandatoryparams) |
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623 |
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624 @property |
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625 def advisoryparams(self): |
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626 # make it an immutable tuple to force people through ``addparam`` |
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627 return tuple(self._advisoryparams) |
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628 |
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629 def addparam(self, name, value='', mandatory=True): |
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630 if self._generated is not None: |
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631 raise error.ReadOnlyPartError('part is being generated') |
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632 if name in self._seenparams: |
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633 raise ValueError('duplicated params: %s' % name) |
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634 self._seenparams.add(name) |
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635 params = self._advisoryparams |
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636 if mandatory: |
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637 params = self._mandatoryparams |
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638 params.append((name, value)) |
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639 |
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640 # methods used to generates the bundle2 stream |
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641 def getchunks(self): |
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642 if self._generated is not None: |
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643 raise RuntimeError('part can only be consumed once') |
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644 self._generated = False |
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645 #### header |
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646 ## parttype |
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647 header = [_pack(_fparttypesize, len(self.type)), |
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648 self.type, _pack(_fpartid, self.id), |
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649 ] |
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650 ## parameters |
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651 # count |
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652 manpar = self.mandatoryparams |
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653 advpar = self.advisoryparams |
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654 header.append(_pack(_fpartparamcount, len(manpar), len(advpar))) |
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655 # size |
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656 parsizes = [] |
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657 for key, value in manpar: |
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658 parsizes.append(len(key)) |
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659 parsizes.append(len(value)) |
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660 for key, value in advpar: |
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661 parsizes.append(len(key)) |
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662 parsizes.append(len(value)) |
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663 paramsizes = _pack(_makefpartparamsizes(len(parsizes) / 2), *parsizes) |
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664 header.append(paramsizes) |
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665 # key, value |
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666 for key, value in manpar: |
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667 header.append(key) |
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668 header.append(value) |
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669 for key, value in advpar: |
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670 header.append(key) |
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671 header.append(value) |
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672 ## finalize header |
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673 headerchunk = ''.join(header) |
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674 yield _pack(_fpartheadersize, len(headerchunk)) |
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675 yield headerchunk |
20877
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676 ## payload |
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677 try: |
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678 for chunk in self._payloadchunks(): |
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679 yield _pack(_fpayloadsize, len(chunk)) |
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680 yield chunk |
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681 except Exception, exc: |
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682 # backup exception data for later |
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683 exc_info = sys.exc_info() |
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684 msg = 'unexpected error: %s' % exc |
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685 interpart = bundlepart('b2x:error:abort', [('message', msg)]) |
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686 interpart.id = 0 |
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687 yield _pack(_fpayloadsize, -1) |
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688 for chunk in interpart.getchunks(): |
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689 yield chunk |
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|
690 # abort current part payload |
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691 yield _pack(_fpayloadsize, 0) |
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692 raise exc_info[0], exc_info[1], exc_info[2] |
21000
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693 # end of payload |
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694 yield _pack(_fpayloadsize, 0) |
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695 self._generated = True |
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696 |
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697 def _payloadchunks(self): |
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698 """yield chunks of a the part payload |
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699 |
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700 Exists to handle the different methods to provide data to a part.""" |
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701 # we only support fixed size data now. |
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702 # This will be improved in the future. |
21001
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703 if util.safehasattr(self.data, 'next'): |
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704 buff = util.chunkbuffer(self.data) |
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705 chunk = buff.read(preferedchunksize) |
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706 while chunk: |
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707 yield chunk |
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708 chunk = buff.read(preferedchunksize) |
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709 elif len(self.data): |
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710 yield self.data |
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|
711 |
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712 |
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713 flaginterrupt = -1 |
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714 |
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715 class interrupthandler(unpackermixin): |
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716 """read one part and process it with restricted capability |
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717 |
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718 This allows to transmit exception raised on the producer size during part |
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719 iteration while the consumer is reading a part. |
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720 |
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721 Part processed in this manner only have access to a ui object,""" |
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722 |
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723 def __init__(self, ui, fp): |
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|
724 super(interrupthandler, self).__init__(fp) |
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725 self.ui = ui |
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|
726 |
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|
727 def _readpartheader(self): |
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728 """reads a part header size and return the bytes blob |
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|
729 |
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|
730 returns None if empty""" |
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|
731 headersize = self._unpack(_fpartheadersize)[0] |
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|
732 if headersize < 0: |
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|
733 raise error.BundleValueError('negative part header size: %i' |
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|
734 % headersize) |
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735 self.ui.debug('part header size: %i\n' % headersize) |
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|
736 if headersize: |
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|
737 return self._readexact(headersize) |
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|
738 return None |
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|
739 |
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|
740 def __call__(self): |
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741 self.ui.debug('bundle2 stream interruption, looking for a part.\n') |
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742 headerblock = self._readpartheader() |
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|
743 if headerblock is None: |
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|
744 self.ui.debug('no part found during interruption.\n') |
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745 return |
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|
746 part = unbundlepart(self.ui, headerblock, self._fp) |
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|
747 op = interruptoperation(self.ui) |
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|
748 _processpart(op, part) |
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|
749 |
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|
750 class interruptoperation(object): |
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|
751 """A limited operation to be use by part handler during interruption |
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|
752 |
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|
753 It only have access to an ui object. |
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|
754 """ |
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|
755 |
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|
756 def __init__(self, ui): |
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757 self.ui = ui |
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758 self.reply = None |
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|
759 |
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|
760 @property |
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|
761 def repo(self): |
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|
762 raise RuntimeError('no repo access from stream interruption') |
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|
763 |
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|
764 def gettransaction(self): |
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|
765 raise TransactionUnavailable('no repo access from stream interruption') |
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|
766 |
21014
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|
767 class unbundlepart(unpackermixin): |
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|
768 """a bundle part read from a bundle""" |
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|
769 |
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770 def __init__(self, ui, header, fp): |
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771 super(unbundlepart, self).__init__(fp) |
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772 self.ui = ui |
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773 # unbundle state attr |
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774 self._headerdata = header |
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775 self._headeroffset = 0 |
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776 self._initialized = False |
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777 self.consumed = False |
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778 # part data |
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779 self.id = None |
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780 self.type = None |
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781 self.mandatoryparams = None |
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782 self.advisoryparams = None |
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783 self.params = None |
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784 self.mandatorykeys = () |
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785 self._payloadstream = None |
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786 self._readheader() |
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787 |
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788 def _fromheader(self, size): |
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789 """return the next <size> byte from the header""" |
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790 offset = self._headeroffset |
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791 data = self._headerdata[offset:(offset + size)] |
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792 self._headeroffset = offset + size |
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793 return data |
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794 |
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795 def _unpackheader(self, format): |
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796 """read given format from header |
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797 |
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798 This automatically compute the size of the format to read.""" |
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799 data = self._fromheader(struct.calcsize(format)) |
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800 return _unpack(format, data) |
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801 |
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802 def _initparams(self, mandatoryparams, advisoryparams): |
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803 """internal function to setup all logic related parameters""" |
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804 # make it read only to prevent people touching it by mistake. |
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805 self.mandatoryparams = tuple(mandatoryparams) |
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806 self.advisoryparams = tuple(advisoryparams) |
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807 # user friendly UI |
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808 self.params = dict(self.mandatoryparams) |
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809 self.params.update(dict(self.advisoryparams)) |
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810 self.mandatorykeys = frozenset(p[0] for p in mandatoryparams) |
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811 |
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812 def _readheader(self): |
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813 """read the header and setup the object""" |
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814 typesize = self._unpackheader(_fparttypesize)[0] |
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815 self.type = self._fromheader(typesize) |
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816 self.ui.debug('part type: "%s"\n' % self.type) |
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817 self.id = self._unpackheader(_fpartid)[0] |
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818 self.ui.debug('part id: "%s"\n' % self.id) |
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819 ## reading parameters |
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820 # param count |
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821 mancount, advcount = self._unpackheader(_fpartparamcount) |
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822 self.ui.debug('part parameters: %i\n' % (mancount + advcount)) |
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823 # param size |
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824 fparamsizes = _makefpartparamsizes(mancount + advcount) |
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825 paramsizes = self._unpackheader(fparamsizes) |
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826 # make it a list of couple again |
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827 paramsizes = zip(paramsizes[::2], paramsizes[1::2]) |
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828 # split mandatory from advisory |
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829 mansizes = paramsizes[:mancount] |
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830 advsizes = paramsizes[mancount:] |
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831 # retrieve param value |
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832 manparams = [] |
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833 for key, value in mansizes: |
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834 manparams.append((self._fromheader(key), self._fromheader(value))) |
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835 advparams = [] |
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836 for key, value in advsizes: |
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837 advparams.append((self._fromheader(key), self._fromheader(value))) |
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838 self._initparams(manparams, advparams) |
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839 ## part payload |
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840 def payloadchunks(): |
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841 payloadsize = self._unpack(_fpayloadsize)[0] |
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842 self.ui.debug('payload chunk size: %i\n' % payloadsize) |
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843 while payloadsize: |
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844 if payloadsize == flaginterrupt: |
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845 # interruption detection, the handler will now read a |
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846 # single part and process it. |
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847 interrupthandler(self.ui, self._fp)() |
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848 elif payloadsize < 0: |
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849 msg = 'negative payload chunk size: %i' % payloadsize |
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850 raise error.BundleValueError(msg) |
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851 else: |
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852 yield self._readexact(payloadsize) |
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853 payloadsize = self._unpack(_fpayloadsize)[0] |
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854 self.ui.debug('payload chunk size: %i\n' % payloadsize) |
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855 self._payloadstream = util.chunkbuffer(payloadchunks()) |
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856 # we read the data, tell it |
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857 self._initialized = True |
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858 |
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859 def read(self, size=None): |
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860 """read payload data""" |
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861 if not self._initialized: |
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862 self._readheader() |
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863 if size is None: |
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864 data = self._payloadstream.read() |
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865 else: |
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866 data = self._payloadstream.read(size) |
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867 if size is None or len(data) < size: |
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868 self.consumed = True |
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869 return data |
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870 |
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871 capabilities = {'HG2Y': (), |
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872 'b2x:listkeys': (), |
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873 'b2x:pushkey': (), |
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874 'digests': tuple(sorted(util.DIGESTS.keys())), |
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875 'b2x:remote-changegroup': ('http', 'https'), |
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876 } |
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877 |
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878 def getrepocaps(repo): |
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879 """return the bundle2 capabilities for a given repo |
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880 |
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881 Exists to allow extensions (like evolution) to mutate the capabilities. |
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882 """ |
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883 caps = capabilities.copy() |
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884 caps['b2x:changegroup'] = tuple(sorted(changegroup.packermap.keys())) |
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885 if obsolete.isenabled(repo, obsolete.exchangeopt): |
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886 supportedformat = tuple('V%i' % v for v in obsolete.formats) |
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887 caps['b2x:obsmarkers'] = supportedformat |
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888 return caps |
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889 |
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890 def bundle2caps(remote): |
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891 """return the bundle capabilities of a peer as dict""" |
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892 raw = remote.capable('bundle2-exp') |
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893 if not raw and raw != '': |
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894 return {} |
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895 capsblob = urllib.unquote(remote.capable('bundle2-exp')) |
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896 return decodecaps(capsblob) |
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897 |
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898 def obsmarkersversion(caps): |
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899 """extract the list of supported obsmarkers versions from a bundle2caps dict |
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900 """ |
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901 obscaps = caps.get('b2x:obsmarkers', ()) |
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902 return [int(c[1:]) for c in obscaps if c.startswith('V')] |
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903 |
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904 @parthandler('b2x:changegroup', ('version',)) |
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905 def handlechangegroup(op, inpart): |
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906 """apply a changegroup part on the repo |
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907 |
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908 This is a very early implementation that will massive rework before being |
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909 inflicted to any end-user. |
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910 """ |
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911 # Make sure we trigger a transaction creation |
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912 # |
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913 # The addchangegroup function will get a transaction object by itself, but |
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914 # we need to make sure we trigger the creation of a transaction object used |
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915 # for the whole processing scope. |
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916 op.gettransaction() |
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917 unpackerversion = inpart.params.get('version', '01') |
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918 # We should raise an appropriate exception here |
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919 unpacker = changegroup.packermap[unpackerversion][1] |
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920 cg = unpacker(inpart, 'UN') |
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|
921 # the source and url passed here are overwritten by the one contained in |
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922 # the transaction.hookargs argument. So 'bundle2' is a placeholder |
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923 ret = changegroup.addchangegroup(op.repo, cg, 'bundle2', 'bundle2') |
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924 op.records.add('changegroup', {'return': ret}) |
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925 if op.reply is not None: |
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926 # This is definitely not the final form of this |
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927 # return. But one need to start somewhere. |
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928 part = op.reply.newpart('b2x:reply:changegroup') |
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929 part.addparam('in-reply-to', str(inpart.id), mandatory=False) |
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|
930 part.addparam('return', '%i' % ret, mandatory=False) |
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|
931 assert not inpart.read() |
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932 |
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933 _remotechangegroupparams = tuple(['url', 'size', 'digests'] + |
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934 ['digest:%s' % k for k in util.DIGESTS.keys()]) |
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935 @parthandler('b2x:remote-changegroup', _remotechangegroupparams) |
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936 def handleremotechangegroup(op, inpart): |
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937 """apply a bundle10 on the repo, given an url and validation information |
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938 |
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939 All the information about the remote bundle to import are given as |
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940 parameters. The parameters include: |
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941 - url: the url to the bundle10. |
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942 - size: the bundle10 file size. It is used to validate what was |
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943 retrieved by the client matches the server knowledge about the bundle. |
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944 - digests: a space separated list of the digest types provided as |
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945 parameters. |
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946 - digest:<digest-type>: the hexadecimal representation of the digest with |
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|
947 that name. Like the size, it is used to validate what was retrieved by |
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948 the client matches what the server knows about the bundle. |
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949 |
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950 When multiple digest types are given, all of them are checked. |
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951 """ |
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952 try: |
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953 raw_url = inpart.params['url'] |
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954 except KeyError: |
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955 raise util.Abort(_('remote-changegroup: missing "%s" param') % 'url') |
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956 parsed_url = util.url(raw_url) |
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957 if parsed_url.scheme not in capabilities['b2x:remote-changegroup']: |
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958 raise util.Abort(_('remote-changegroup does not support %s urls') % |
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959 parsed_url.scheme) |
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|
960 |
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961 try: |
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962 size = int(inpart.params['size']) |
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963 except ValueError: |
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964 raise util.Abort(_('remote-changegroup: invalid value for param "%s"') |
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965 % 'size') |
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966 except KeyError: |
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967 raise util.Abort(_('remote-changegroup: missing "%s" param') % 'size') |
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968 |
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969 digests = {} |
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970 for typ in inpart.params.get('digests', '').split(): |
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971 param = 'digest:%s' % typ |
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972 try: |
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973 value = inpart.params[param] |
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974 except KeyError: |
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975 raise util.Abort(_('remote-changegroup: missing "%s" param') % |
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|
976 param) |
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977 digests[typ] = value |
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978 |
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979 real_part = util.digestchecker(url.open(op.ui, raw_url), size, digests) |
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980 |
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|
981 # Make sure we trigger a transaction creation |
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982 # |
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983 # The addchangegroup function will get a transaction object by itself, but |
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984 # we need to make sure we trigger the creation of a transaction object used |
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985 # for the whole processing scope. |
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986 op.gettransaction() |
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987 import exchange |
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988 cg = exchange.readbundle(op.repo.ui, real_part, raw_url) |
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989 if not isinstance(cg, changegroup.cg1unpacker): |
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990 raise util.Abort(_('%s: not a bundle version 1.0') % |
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991 util.hidepassword(raw_url)) |
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992 ret = changegroup.addchangegroup(op.repo, cg, 'bundle2', 'bundle2') |
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993 op.records.add('changegroup', {'return': ret}) |
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994 if op.reply is not None: |
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995 # This is definitely not the final form of this |
23029
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996 # return. But one need to start somewhere. |
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997 part = op.reply.newpart('b2x:reply:changegroup') |
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998 part.addparam('in-reply-to', str(inpart.id), mandatory=False) |
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999 part.addparam('return', '%i' % ret, mandatory=False) |
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1000 try: |
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1001 real_part.validate() |
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1002 except util.Abort, e: |
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1003 raise util.Abort(_('bundle at %s is corrupted:\n%s') % |
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1004 (util.hidepassword(raw_url), str(e))) |
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1005 assert not inpart.read() |
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1006 |
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1007 @parthandler('b2x:reply:changegroup', ('return', 'in-reply-to')) |
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1008 def handlereplychangegroup(op, inpart): |
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1009 ret = int(inpart.params['return']) |
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1010 replyto = int(inpart.params['in-reply-to']) |
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1011 op.records.add('changegroup', {'return': ret}, replyto) |
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1012 |
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1013 @parthandler('b2x:check:heads') |
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1014 def handlecheckheads(op, inpart): |
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1015 """check that head of the repo did not change |
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1016 |
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1017 This is used to detect a push race when using unbundle. |
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1018 This replaces the "heads" argument of unbundle.""" |
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1019 h = inpart.read(20) |
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1020 heads = [] |
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1021 while len(h) == 20: |
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1022 heads.append(h) |
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1023 h = inpart.read(20) |
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1024 assert not h |
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1025 if heads != op.repo.heads(): |
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1026 raise error.PushRaced('repository changed while pushing - ' |
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1027 'please try again') |
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1028 |
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1029 @parthandler('b2x:output') |
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1030 def handleoutput(op, inpart): |
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1031 """forward output captured on the server to the client""" |
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1032 for line in inpart.read().splitlines(): |
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1033 op.ui.write(('remote: %s\n' % line)) |
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1034 |
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1035 @parthandler('b2x:replycaps') |
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1036 def handlereplycaps(op, inpart): |
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1037 """Notify that a reply bundle should be created |
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1038 |
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1039 The payload contains the capabilities information for the reply""" |
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1040 caps = decodecaps(inpart.read()) |
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1041 if op.reply is None: |
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1042 op.reply = bundle20(op.ui, caps) |
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1043 |
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1044 @parthandler('b2x:error:abort', ('message', 'hint')) |
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1045 def handlereplycaps(op, inpart): |
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1046 """Used to transmit abort error over the wire""" |
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1047 raise util.Abort(inpart.params['message'], hint=inpart.params.get('hint')) |
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1048 |
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1049 @parthandler('b2x:error:unsupportedcontent', ('parttype', 'params')) |
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1050 def handlereplycaps(op, inpart): |
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1051 """Used to transmit unknown content error over the wire""" |
21622
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1052 kwargs = {} |
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1053 parttype = inpart.params.get('parttype') |
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1054 if parttype is not None: |
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1055 kwargs['parttype'] = parttype |
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1056 params = inpart.params.get('params') |
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1057 if params is not None: |
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1058 kwargs['params'] = params.split('\0') |
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1059 |
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1060 raise error.UnsupportedPartError(**kwargs) |
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1061 |
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1062 @parthandler('b2x:error:pushraced', ('message',)) |
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1063 def handlereplycaps(op, inpart): |
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1064 """Used to transmit push race error over the wire""" |
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1065 raise error.ResponseError(_('push failed:'), inpart.params['message']) |
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1066 |
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1067 @parthandler('b2x:listkeys', ('namespace',)) |
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1068 def handlelistkeys(op, inpart): |
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1069 """retrieve pushkey namespace content stored in a bundle2""" |
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1070 namespace = inpart.params['namespace'] |
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1071 r = pushkey.decodekeys(inpart.read()) |
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1072 op.records.add('listkeys', (namespace, r)) |
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1073 |
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1074 @parthandler('b2x:pushkey', ('namespace', 'key', 'old', 'new')) |
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1075 def handlepushkey(op, inpart): |
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1076 """process a pushkey request""" |
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1077 dec = pushkey.decode |
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1078 namespace = dec(inpart.params['namespace']) |
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1079 key = dec(inpart.params['key']) |
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1080 old = dec(inpart.params['old']) |
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1081 new = dec(inpart.params['new']) |
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1082 ret = op.repo.pushkey(namespace, key, old, new) |
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1083 record = {'namespace': namespace, |
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1084 'key': key, |
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1085 'old': old, |
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1086 'new': new} |
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1087 op.records.add('pushkey', record) |
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1088 if op.reply is not None: |
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1089 rpart = op.reply.newpart('b2x:reply:pushkey') |
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1090 rpart.addparam('in-reply-to', str(inpart.id), mandatory=False) |
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1091 rpart.addparam('return', '%i' % ret, mandatory=False) |
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1092 |
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1093 @parthandler('b2x:reply:pushkey', ('return', 'in-reply-to')) |
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1094 def handlepushkeyreply(op, inpart): |
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1095 """retrieve the result of a pushkey request""" |
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1096 ret = int(inpart.params['return']) |
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1097 partid = int(inpart.params['in-reply-to']) |
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1098 op.records.add('pushkey', {'return': ret}, partid) |
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1099 |
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1100 @parthandler('b2x:obsmarkers') |
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1101 def handleobsmarker(op, inpart): |
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1102 """add a stream of obsmarkers to the repo""" |
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1103 tr = op.gettransaction() |
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1104 new = op.repo.obsstore.mergemarkers(tr, inpart.read()) |
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1105 if new: |
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1106 op.repo.ui.status(_('%i new obsolescence markers\n') % new) |
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1107 op.records.add('obsmarkers', {'new': new}) |
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1108 if op.reply is not None: |
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1109 rpart = op.reply.newpart('b2x:reply:obsmarkers') |
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1110 rpart.addparam('in-reply-to', str(inpart.id), mandatory=False) |
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1111 rpart.addparam('new', '%i' % new, mandatory=False) |
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1112 |
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1113 |
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1114 @parthandler('b2x:reply:obsmarkers', ('new', 'in-reply-to')) |
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1115 def handlepushkeyreply(op, inpart): |
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1116 """retrieve the result of a pushkey request""" |
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1117 ret = int(inpart.params['new']) |
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1118 partid = int(inpart.params['in-reply-to']) |
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1119 op.records.add('obsmarkers', {'new': ret}, partid) |