annotate README.txt @ 42:1cc89badc5c6

notes
author Jeff Hammel <jhammel@mozilla.com>
date Fri, 12 Apr 2013 01:17:29 -0700
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1 WSGraph
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2 ===========
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3
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4 WSGI graph server
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7 Directed Graphs
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8 ===============
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9
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10 Storage
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11 -------
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13 A directed graph may be expressed as JSON::
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15 {'nodes': {'node1': {'metadata1': value, ...},
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16 'node2': {'metadata1': value, ...}}.
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17 'edges': {'node1': {'node2': {'metadata': value}, ...},
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18 ...},
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19 'graphmetadata': value,
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20 ...}
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22 In languages like python, which can hash (key, value) pairs, the edges
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23 may be more conveniently hashed::
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25 edges[('foo', 'bar')] = {'metadata': value}
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27 A directed graph may be stored in a RDB::
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29 Table: *nodes*
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31 +----+---------+---------+---+
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32 |node|metadata1|metadata2|...|
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33 +====+=========+=========+===+
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34 |foo |value |value | |
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35 +----+---------+---------+---+
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36 |bar |value |value | |
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37 +----+---------+---------+---+
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39 Table: *edges*
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41 +-----+-----+---------+---------+---+
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42 |node1|node2|metadata1|metadata2|...|
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43 +=====+=====+=========+=========+===+
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44 |foo |bar |value |value | |
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45 +-----+-----+---------+---------+---+
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47 Note that the nodes table has unique keys, but the edges table has
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48 rows identified only by the ordered set of two keys: node1 and node2.
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49
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50 Previous formats use a node and value hash of a string: the nodes have
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51 a given name. While this is convenient for human identification, a
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52 more efficient hashing mechanism may be achieved by an algorithm.
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53 Since a edge is a unique hash of two nodes, the nodes may be numbered
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54 with an appropriate algorithm giving a unique hash per edge.
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57 Higher Dimensionality
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58 ---------------------
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59
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60 * faces
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61 * ...
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63
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64 Links
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65 -----
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66
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67 * http://www.graphdracula.net/
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68 * http://thejit.org/
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69
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70 Ideas
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71 -----
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72
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73 I work at automation and testing at Mozilla, but have been known to
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74 don multiple hats, and, not surprisingly, I think a lot about how the
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75 web works. So I just read Stuart's blog post and couldn't help but
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76 feel that it plays somewhat in to my idea of mine.
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77
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78 Background....
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79
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80 The web is a directed graph (
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81 http://en.wikipedia.org/wiki/Directed_graph ). The nodes of the
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82 directed graphs are web pages and the edges of the directed graphs are
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83 produced when you clicked on a link. This gives a unique opportunity
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84 to provide maps of the web. There are a few components in this
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85 visualization.
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86
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87 A site map. This is a map that sits on a server. When a visitor
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88 clicks on a link, a new edge is added by reading HTTP REFERER. A toy
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89 example, no longer "live", is at http://k0s.org/map.svg . This gives
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90 both the webmaster and visitors to see how the site is traveled: the
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91 well worn routes as well as the dusty trails. Note that the map
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92 itself is an element on the map :) In addition, the map could be
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93 embedded as a navigation aid on any page that desires it. Obviously a
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94 lot more could be done here than is shown in the toy example: nodes
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95 could be collapsed into metanodes until expanded (that is
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96 /pictures/mission/capp.jpg and /pictures/mission/cowboy.jpg might just
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97 be /pictures/mission for the sake of easy navigation unless a user
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98 clicked in for closer detail), etc. The algorithm is really simple:
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99 - for each request (in middleware) read the path info and the HTTP
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100 referer
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101 - if this edge doesn't exist create it
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102 - if it does, add one to its count (and whatever other metadata you
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103 want....you have the whole request)
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104 - additionally, you need a handler to display this data
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105 Some sites do this though I rarely see it presented this way and even
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106 more rarely to the user.
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107 In addition, you can make the system federated. For instance, lets
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108 say foo.org and bar.org both have maps (presumedly noted as <link
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109 rel="" type=""> in their <HEAD>s). If there is traffic from foo to
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110 bar you can stitch these maps together at the points where they meet.
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111 You have a federated map of the web!
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112
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113 The map of one's journey. So the above is from the site's point of
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114 view. What about the user's point of view? It would be easy to make
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115 an addon that recorded your own map of how you traversed the web. You
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116 click on a link in any tab and, again, an edge is created (and
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117 populated with whatever metadata you want). You can see how you use
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118 the web as well as share your travels with friends. This could also
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119 link up with site maps when they are available.
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120
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121 Just some things I've been thinking of in the last two years. I'm
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122 happy to go into more detail or flush them out if there is interest.
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123
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124 https://groups.google.com/forum/?hl=en#!topic/mozilla-labs-pancake/TbRFpxvic6M
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125 http://play.fxhome.mozillalabs.com:4322/lattice/oyiptong@mozilla.com/graph/vis.html
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126
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127
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128 = Graph exchange formats =
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129
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130 [Planned] WSGraph should be able to import and export any of the
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131 standard graph formats
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132
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133 * JSGN (native)
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134 * http://en.wikipedia.org/wiki/Graph_Modelling_Language
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135 * http://en.wikipedia.org/wiki/GraphML
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136 * http://en.wikipedia.org/wiki/Trivial_Graph_Format
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137 * http://www.gupro.de/GXL/ , http://en.wikipedia.org/wiki/GXL
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138 * http://en.wikipedia.org/wiki/Dot_language (Graphviz)
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139
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140
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141 = Resources =
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142
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143 Python packages related to graphs:
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144
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145 * graph-tool: http://en.wikipedia.org/wiki/Graph-tool ,
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146 https://pypi.python.org/pypi/graph-tool
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147
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148
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149 External libraries and tools
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150
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151 * Graphviz
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152 * tulip: http://tulip.labri.fr/TulipDrupal/
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153 * GUESS: http://graphexploration.cond.org/
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154 * Java Universal Network/Graph Framework : http://jung.sourceforge.net/
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155
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156 See also http://k0s.org/links/?q=graph
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157
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158
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159 Parallel Efforts
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160 ----------------
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161
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162 * http://k0s.org/hg/IntentMadeManifest/
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163
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164
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165
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166 ----
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167
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168 Jeff Hammel
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169
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170 http://k0s.org/hg/WSGraph
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171