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annotate mercurial/bundle2.py @ 20808:4c9130c7a29f

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bundle2: clarify stream parameter design in the documentation Stream level parameter have very restricted use case. Clarify why we chosen a textual format and point that applicative data goes in applicative parts.
author Pierre-Yves David <pierre-yves.david@fb.com>
date Thu, 20 Mar 2014 13:18:34 -0700
parents c5aaeca0cfbf
children b93bb639451a
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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 current implementation accept some stream level option but no part.
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25
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26 Details on the Binary format
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27 ============================
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28
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29 All numbers are unsigned and big endian.
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30
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31 stream level parameters
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32 ------------------------
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33
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34 Binary format is as follow
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35
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36 :params size: (16 bits integer)
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37
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38 The total number of Bytes used by the parameters
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39
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40 :params value: arbitrary number of Bytes
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41
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42 A blob of `params size` containing the serialized version of all stream level
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43 parameters.
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44
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45 The blob contains a space separated list of parameters.
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46
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47 Parameter value are not supported yet.
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48
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49 Special character in param name are not supported yet.
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50
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51 Stream parameters use a simple textual format for two main reasons:
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52
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53 - Stream level parameters should remains simple and we want to discourage any
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54 crazy usage.
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55 - Textual data allow easy human inspection of a the bundle2 header in case of
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56 troubles.
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57
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58 Any Applicative level options MUST go into a bundle2 part instead.
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59
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60
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61 Payload part
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62 ------------------------
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63
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64 Binary format is as follow
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65
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66 :header size: (16 bits inter)
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67
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68 The total number of Bytes used by the part headers. When the header is empty
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69 (size = 0) this is interpreted as the end of stream marker.
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70
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71 Currently forced to 0 in the current state of the implementation
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72 """
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73
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74 import util
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75 import struct
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76
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77 import changegroup
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78 from i18n import _
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79
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80 _pack = struct.pack
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81 _unpack = struct.unpack
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82
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83 _magicstring = 'HG20'
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84
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85 _fstreamparamsize = '>H'
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86
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87 class bundle20(object):
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88 """represent an outgoing bundle2 container
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89
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90 Use the `addparam` method to add stream level parameter. Then call
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91 `getchunks` to retrieve all the binary chunks of datathat compose the
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92 bundle2 container.
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93
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94 This object does not support payload part yet."""
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95
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96 def __init__(self):
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97 self._params = []
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98 self._parts = []
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99
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100 def addparam(self, name, value=None):
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101 """add a stream level parameter"""
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102 self._params.append((name, value))
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103
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104 def getchunks(self):
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105 yield _magicstring
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106 param = self._paramchunk()
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107 yield _pack(_fstreamparamsize, len(param))
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108 if param:
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109 yield param
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110
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111 # no support for parts
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112 # to be obviously fixed soon.
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113 assert not self._parts
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114 yield '\0\0'
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115
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116 def _paramchunk(self):
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117 """return a encoded version of all stream parameters"""
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118 blocks = []
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119 for key, value in self._params:
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120 # XXX no support for value yet
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121 assert value is None
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122 # XXX no escaping yet
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123 blocks.append(key)
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124 return ' '.join(blocks)
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125
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126 class unbundle20(object):
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127 """interpret a bundle2 stream
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128
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129 (this will eventually yield parts)"""
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130
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131 def __init__(self, fp):
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132 self._fp = fp
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133 header = self._readexact(4)
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134 magic, version = header[0:2], header[2:4]
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135 if magic != 'HG':
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136 raise util.Abort(_('not a Mercurial bundle'))
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137 if version != '20':
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138 raise util.Abort(_('unknown bundle version %s') % version)
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139
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140 def _unpack(self, format):
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141 """unpack this struct format from the stream"""
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142 data = self._readexact(struct.calcsize(format))
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143 return _unpack(format, data)
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144
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145 def _readexact(self, size):
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146 """read exactly <size> bytes from the stream"""
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147 return changegroup.readexactly(self._fp, size)
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148
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149 @util.propertycache
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150 def params(self):
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151 """dictionnary of stream level parameters"""
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152 params = {}
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153 paramssize = self._unpack(_fstreamparamsize)[0]
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154 if paramssize:
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155 for p in self._readexact(paramssize).split(' '):
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156 params[p] = None
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157 return params
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158
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159 def __iter__(self):
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160 """yield all parts contained in the stream"""
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161 # make sure param have been loaded
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162 self.params
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163 part = self._readpart()
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164 while part is not None:
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165 yield part
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166 part = self._readpart()
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167
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168 def _readpart(self):
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169 """return None when an end of stream markers is reach"""
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170 headersize = self._readexact(2)
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171 assert headersize == '\0\0'
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172 return None
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173
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174
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175