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annotate mercurial/bundle2.py @ 20876:ddd56f3eb786

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bundle2: support for bundling and unbundling payload We add the ability to bundle and unbundle a payload in parts. The payload is the actual binary data of the part. It is used to convey all the applicative data. For now we stick to very simple implementation with all the data fit in single chunk. This open the door to some bundle2 testing usage. This will be improved before bundle2 get used for real. We need to be able to stream the payload in multiple part to exchange any changegroup efficiently. This simple version will do for now. Bundling and unbundling are done in the same changeset because the test for parts is less modular. However, the result is not too complex.
author Pierre-Yves David <pierre-yves.david@fb.com>
date Wed, 19 Mar 2014 23:36:15 -0700
parents 9a75d2559cff
children 9e9e3a4e9261
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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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13
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14 General format architecture
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15 ===========================
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16
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17 The format is architectured as follow
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18
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19 - magic string
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20 - stream level parameters
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21 - payload parts (any number)
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22 - end of stream marker.
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23
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24 the Binary format
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25 ============================
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26
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27 All numbers are unsigned and big endian.
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28
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29 stream level parameters
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30 ------------------------
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31
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32 Binary format is as follow
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33
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34 :params size: (16 bits integer)
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35
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36 The total number of Bytes used by the parameters
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37
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38 :params value: arbitrary number of Bytes
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39
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40 A blob of `params size` containing the serialized version of all stream level
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41 parameters.
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42
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43 The blob contains a space separated list of parameters. parameter 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 safefly 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 remains 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 the bundle2 header in case of
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58 troubles.
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60 Any Applicative level options MUST go into a bundle2 part instead.
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61
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62 Payload part
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63 ------------------------
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64
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65 Binary format is as follow
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66
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67 :header size: (16 bits inter)
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68
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69 The total number of Bytes used by the part headers. When the header is empty
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70 (size = 0) this is interpreted as the end of stream marker.
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71
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72 :header:
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73
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74 The header defines how to interpret the part. It contains two piece of
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75 data: the part type, and the part parameters.
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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 :typename: alphanumerical part name
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88 :option: we do not support option yet this denoted by two 16 bites zero.
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89
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90 :payload:
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91
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92 payload is a series of `<chunksize><chunkdata>`.
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93
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94 `chunksize` is a 32 bits integer, `chunkdata` are plain bytes (as much as
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95 `chunksize` says)` The payload part is concluded by a zero size chunk.
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96
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97 The current implementation always produces either zero or one chunk.
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98 This is an implementation limitation that will ultimatly be lifted.
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99 """
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100
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101 import util
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102 import struct
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103 import urllib
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104 import string
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105
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106 import changegroup
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107 from i18n import _
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108
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109 _pack = struct.pack
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110 _unpack = struct.unpack
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111
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112 _magicstring = 'HG20'
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113
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114 _fstreamparamsize = '>H'
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115 _fpartheadersize = '>H'
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116 _fparttypesize = '>B'
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117 _fpayloadsize = '>I'
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118
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119 class bundle20(object):
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120 """represent an outgoing bundle2 container
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121
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122 Use the `addparam` method to add stream level parameter. and `addpart` to
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123 populate it. Then call `getchunks` to retrieve all the binary chunks of
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124 datathat compose the bundle2 container."""
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125
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126 def __init__(self, ui):
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127 self.ui = ui
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128 self._params = []
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129 self._parts = []
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130
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131 def addparam(self, name, value=None):
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132 """add a stream level parameter"""
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133 if not name:
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134 raise ValueError('empty parameter name')
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135 if name[0] not in string.letters:
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136 raise ValueError('non letter first character: %r' % name)
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137 self._params.append((name, value))
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138
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139 def addpart(self, part):
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140 """add a new part to the bundle2 container
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141
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142 Parts contains the actuall applicative payload."""
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143 self._parts.append(part)
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144
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145 def getchunks(self):
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146 self.ui.debug('start emission of %s stream\n' % _magicstring)
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147 yield _magicstring
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148 param = self._paramchunk()
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149 self.ui.debug('bundle parameter: %s\n' % param)
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150 yield _pack(_fstreamparamsize, len(param))
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151 if param:
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152 yield param
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153
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154 self.ui.debug('start of parts\n')
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155 for part in self._parts:
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156 self.ui.debug('bundle part: "%s"\n' % part.type)
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157 for chunk in part.getchunks():
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158 yield chunk
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159 self.ui.debug('end of bundle\n')
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160 yield '\0\0'
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161
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162 def _paramchunk(self):
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163 """return a encoded version of all stream parameters"""
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164 blocks = []
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165 for par, value in self._params:
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166 par = urllib.quote(par)
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167 if value is not None:
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168 value = urllib.quote(value)
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169 par = '%s=%s' % (par, value)
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170 blocks.append(par)
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171 return ' '.join(blocks)
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172
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173 class unbundle20(object):
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174 """interpret a bundle2 stream
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175
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176 (this will eventually yield parts)"""
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177
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178 def __init__(self, ui, fp):
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179 self.ui = ui
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180 self._fp = fp
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181 header = self._readexact(4)
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182 magic, version = header[0:2], header[2:4]
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183 if magic != 'HG':
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184 raise util.Abort(_('not a Mercurial bundle'))
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185 if version != '20':
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186 raise util.Abort(_('unknown bundle version %s') % version)
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187 self.ui.debug('start processing of %s stream\n' % header)
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188
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189 def _unpack(self, format):
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190 """unpack this struct format from the stream"""
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191 data = self._readexact(struct.calcsize(format))
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192 return _unpack(format, data)
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193
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194 def _readexact(self, size):
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195 """read exactly <size> bytes from the stream"""
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196 return changegroup.readexactly(self._fp, size)
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197
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198 @util.propertycache
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199 def params(self):
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200 """dictionnary of stream level parameters"""
20843
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201 self.ui.debug('reading bundle2 stream parameters\n')
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202 params = {}
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203 paramssize = self._unpack(_fstreamparamsize)[0]
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204 if paramssize:
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diff changeset
205 for p in self._readexact(paramssize).split(' '):
20810
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diff changeset
206 p = p.split('=', 1)
20812
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diff changeset
207 p = [urllib.unquote(i) for i in p]
20810
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diff changeset
208 if len(p) < 2:
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diff changeset
209 p.append(None)
20844
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diff changeset
210 self._processparam(*p)
20810
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diff changeset
211 params[p[0]] = p[1]
20805
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diff changeset
212 return params
20802
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diff changeset
213
20844
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214 def _processparam(self, name, value):
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diff changeset
215 """process a parameter, applying its effect if needed
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diff changeset
216
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diff changeset
217 Parameter starting with a lower case letter are advisory and will be
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diff changeset
218 ignored when unknown. Those starting with an upper case letter are
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diff changeset
219 mandatory and will this function will raise a KeyError when unknown.
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diff changeset
220
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diff changeset
221 Note: no option are currently supported. Any input will be either
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diff changeset
222 ignored or failing.
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diff changeset
223 """
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224 if not name:
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225 raise ValueError('empty parameter name')
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diff changeset
226 if name[0] not in string.letters:
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diff changeset
227 raise ValueError('non letter first character: %r' % name)
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diff changeset
228 # Some logic will be later added here to try to process the option for
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229 # a dict of known parameter.
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diff changeset
230 if name[0].islower():
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diff changeset
231 self.ui.debug("ignoring unknown parameter %r\n" % name)
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diff changeset
232 else:
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diff changeset
233 raise KeyError(name)
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diff changeset
234
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diff changeset
235
20802
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236 def __iter__(self):
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237 """yield all parts contained in the stream"""
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238 # make sure param have been loaded
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239 self.params
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240 self.ui.debug('start extraction of bundle2 parts\n')
20802
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241 part = self._readpart()
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242 while part is not None:
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243 yield part
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244 part = self._readpart()
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245 self.ui.debug('end of bundle2 stream\n')
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246
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247 def _readpart(self):
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248 """return None when an end of stream markers is reach"""
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249
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250 headersize = self._unpack(_fpartheadersize)[0]
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251 self.ui.debug('part header size: %i\n' % headersize)
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252 if not headersize:
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253 return None
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254 headerblock = self._readexact(headersize)
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255 # some utility to help reading from the header block
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256 self._offset = 0 # layer violation to have something easy to understand
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257 def fromheader(size):
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258 """return the next <size> byte from the header"""
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259 offset = self._offset
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260 data = headerblock[offset:(offset + size)]
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261 self._offset = offset + size
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262 return data
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263 typesize = _unpack(_fparttypesize, fromheader(1))[0]
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264 parttype = fromheader(typesize)
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265 self.ui.debug('part type: "%s"\n' % parttype)
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266 assert fromheader(2) == '\0\0' # no option for now
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267 del self._offset # clean up layer, nobody saw anything.
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268 self.ui.debug('part parameters: 0\n')
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269 payload = []
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270 payloadsize = self._unpack(_fpayloadsize)[0]
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271 self.ui.debug('payload chunk size: %i\n' % payloadsize)
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272 while payloadsize:
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273 payload.append(self._readexact(payloadsize))
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274 payloadsize = self._unpack(_fpayloadsize)[0]
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275 self.ui.debug('payload chunk size: %i\n' % payloadsize)
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276 payload = ''.join(payload)
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277 current = part(parttype, data=payload)
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278 return current
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279
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280
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281 class part(object):
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282 """A bundle2 part contains application level payload
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283
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284 The part `type` is used to route the part to the application level
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285 handler.
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286 """
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287
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288 def __init__(self, parttype, data=''):
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289 self.type = parttype
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290 self.data = data
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291
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292 def getchunks(self):
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293 ### header
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294 header = [_pack(_fparttypesize, len(self.type)),
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295 self.type,
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296 '\0\0', # No option support for now.
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297 ]
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298 headerchunk = ''.join(header)
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299 yield _pack(_fpartheadersize, len(headerchunk))
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300 yield headerchunk
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301 # we only support fixed size data now.
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302 # This will be improved in the future.
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303 if len(self.data):
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304 yield _pack(_fpayloadsize, len(self.data))
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305 yield self.data
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306 # end of payload
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307 yield _pack(_fpayloadsize, 0)
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308
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309