Mercurial > hg > WSGraph
annotate README.txt @ 50:d837f2031715
notes
| author | Jeff Hammel <jhammel@mozilla.com> |
|---|---|
| date | Fri, 03 May 2013 09:25:49 -0700 |
| parents | dd7ea3d8e2cd |
| children | 21f8060547c1 |
| rev | line source |
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| 0 | 1 WSGraph |
| 2 =========== | |
| 3 | |
| 4 WSGI graph server | |
| 5 | |
| 40 | 6 |
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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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12 |
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13 A directed graph may be expressed as JSON:: |
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14 |
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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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21 |
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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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24 |
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25 edges[('foo', 'bar')] = {'metadata': value} |
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26 |
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27 A directed graph may be stored in a RDB:: |
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28 |
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29 Table: *nodes* |
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30 |
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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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38 |
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39 Table: *edges* |
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40 |
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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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46 |
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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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55 |
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56 |
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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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62 |
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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 Javascript: |
| 50 | 68 * http://www.jgraph.com/mxgraph.html |
| 69 Interactive JavaScript HTML 5 Diagramming Library; | |
| 70 demo at https://www.draw.io/ | |
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71 * http://www.graphdracula.net/ |
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72 * http://thejit.org/ |
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73 |
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74 Graph DBs: |
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75 * https://pypi.python.org/pypi/ajgu : Graphe database with several |
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76 backends architecture in mind |
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77 |
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78 |
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79 Ideas |
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80 ----- |
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81 |
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82 I work at automation and testing at Mozilla, but have been known to |
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83 don multiple hats, and, not surprisingly, I think a lot about how the |
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84 web works. So I just read Stuart's blog post and couldn't help but |
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85 feel that it plays somewhat in to my idea of mine. |
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86 |
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87 Background.... |
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88 |
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89 The web is a directed graph ( |
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90 http://en.wikipedia.org/wiki/Directed_graph ). The nodes of the |
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91 directed graphs are web pages and the edges of the directed graphs are |
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92 produced when you clicked on a link. This gives a unique opportunity |
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93 to provide maps of the web. There are a few components in this |
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94 visualization. |
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95 |
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96 A site map. This is a map that sits on a server. When a visitor |
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97 clicks on a link, a new edge is added by reading HTTP REFERER. A toy |
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98 example, no longer "live", is at http://k0s.org/map.svg . This gives |
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99 both the webmaster and visitors to see how the site is traveled: the |
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100 well worn routes as well as the dusty trails. Note that the map |
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101 itself is an element on the map :) In addition, the map could be |
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102 embedded as a navigation aid on any page that desires it. Obviously a |
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103 lot more could be done here than is shown in the toy example: nodes |
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104 could be collapsed into metanodes until expanded (that is |
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105 /pictures/mission/capp.jpg and /pictures/mission/cowboy.jpg might just |
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106 be /pictures/mission for the sake of easy navigation unless a user |
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107 clicked in for closer detail), etc. The algorithm is really simple: |
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108 - for each request (in middleware) read the path info and the HTTP |
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109 referer |
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110 - if this edge doesn't exist create it |
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111 - if it does, add one to its count (and whatever other metadata you |
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112 want....you have the whole request) |
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113 - additionally, you need a handler to display this data |
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114 Some sites do this though I rarely see it presented this way and even |
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115 more rarely to the user. |
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116 In addition, you can make the system federated. For instance, lets |
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117 say foo.org and bar.org both have maps (presumedly noted as <link |
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118 rel="" type=""> in their <HEAD>s). If there is traffic from foo to |
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119 bar you can stitch these maps together at the points where they meet. |
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120 You have a federated map of the web! |
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121 |
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122 The map of one's journey. So the above is from the site's point of |
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123 view. What about the user's point of view? It would be easy to make |
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124 an addon that recorded your own map of how you traversed the web. You |
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125 click on a link in any tab and, again, an edge is created (and |
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126 populated with whatever metadata you want). You can see how you use |
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127 the web as well as share your travels with friends. This could also |
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128 link up with site maps when they are available. |
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129 |
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130 Just some things I've been thinking of in the last two years. I'm |
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131 happy to go into more detail or flush them out if there is interest. |
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132 |
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133 https://groups.google.com/forum/?hl=en#!topic/mozilla-labs-pancake/TbRFpxvic6M |
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134 http://play.fxhome.mozillalabs.com:4322/lattice/oyiptong@mozilla.com/graph/vis.html |
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135 |
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136 |
| 42 | 137 = Graph exchange formats = |
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138 |
| 42 | 139 [Planned] WSGraph should be able to import and export any of the |
| 140 standard graph formats | |
| 40 | 141 |
| 42 | 142 * JSGN (native) |
| 40 | 143 * http://en.wikipedia.org/wiki/Graph_Modelling_Language |
| 144 * http://en.wikipedia.org/wiki/GraphML | |
| 145 * http://en.wikipedia.org/wiki/Trivial_Graph_Format | |
| 146 * http://www.gupro.de/GXL/ , http://en.wikipedia.org/wiki/GXL | |
| 147 * http://en.wikipedia.org/wiki/Dot_language (Graphviz) | |
| 148 | |
| 149 | |
| 42 | 150 = Resources = |
| 151 | |
| 40 | 152 Python packages related to graphs: |
| 153 | |
| 154 * graph-tool: http://en.wikipedia.org/wiki/Graph-tool , | |
| 43 | 155 https://pypi.python.org/pypi/graph-tool , |
| 156 http://projects.skewed.de/graph-tool/ | |
| 40 | 157 |
| 44 | 158 Javascript: |
| 159 | |
| 160 * http://arborjs.org/ | |
| 161 | |
| 40 | 162 |
| 48 | 163 Other external libraries and tools: |
| 40 | 164 |
| 48 | 165 * Graphviz: the old, the venerable, and still the king |
| 40 | 166 * tulip: http://tulip.labri.fr/TulipDrupal/ |
| 42 | 167 * GUESS: http://graphexploration.cond.org/ |
| 168 * Java Universal Network/Graph Framework : http://jung.sourceforge.net/ | |
| 43 | 169 * graphthing http://graph.seul.org/ |
| 170 * igraph http://igraph.sourceforge.net/ | |
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171 * blockdiag: imple diagram images generator; http://blockdiag.com/ |
| 49 | 172 * graphthing: http://graph.seul.org/ |
| 40 | 173 |
| 48 | 174 Let's not forget |
| 175 * ganv: Ganv is an interactive Gtk canvas widget for graph-based | |
| 176 interfaces; | |
| 177 http://dev.drobilla.net/browser/trunk/ganv (though see also | |
| 178 http://packages.ubuntu.com/source/quantal/libs/ganv and | |
| 179 http://harryhaaren.blogspot.com/2012/12/getting-to-grips-with-flowcanvas.html | |
| 49 | 180 ) |
| 48 | 181 |
| 182 | |
| 42 | 183 See also http://k0s.org/links/?q=graph |
| 40 | 184 |
| 43 | 185 (And what is |
| 186 https://github.com/tinkerpop/blueprints/wiki/GraphML-Reader-and-Writer-Library ?) | |
| 40 | 187 |
| 188 Parallel Efforts | |
| 189 ---------------- | |
| 190 | |
| 191 * http://k0s.org/hg/IntentMadeManifest/ | |
| 192 | |
| 193 | |
| 45 | 194 TODO |
| 195 ---- | |
| 196 | |
| 197 * a tool to take graphml embedded in a webpage (or other suitable | |
| 198 format) and generate a graph in the chosen form (e.g. <img | |
| 199 src="_generated_graph.png"/> or whatevr we can hammer into HTML | |
| 40 | 200 |
| 0 | 201 ---- |
| 202 | |
| 203 Jeff Hammel | |
| 204 | |
| 205 http://k0s.org/hg/WSGraph | |
| 206 |