Mercurial > hg > WSGraph
annotate README.txt @ 43:6e6da56f0d68
last notes!
| author | Jeff Hammel <jhammel@mozilla.com> |
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| date | Fri, 12 Apr 2013 01:47:19 -0700 |
| parents | 1cc89badc5c6 |
| children | 6b1d76a8cac6 |
| 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 * 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 |
| 42 | 128 = Graph exchange formats = |
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129 |
| 42 | 130 [Planned] WSGraph should be able to import and export any of the |
| 131 standard graph formats | |
| 40 | 132 |
| 42 | 133 * JSGN (native) |
| 40 | 134 * http://en.wikipedia.org/wiki/Graph_Modelling_Language |
| 135 * http://en.wikipedia.org/wiki/GraphML | |
| 136 * http://en.wikipedia.org/wiki/Trivial_Graph_Format | |
| 137 * http://www.gupro.de/GXL/ , http://en.wikipedia.org/wiki/GXL | |
| 138 * http://en.wikipedia.org/wiki/Dot_language (Graphviz) | |
| 139 | |
| 140 | |
| 42 | 141 = Resources = |
| 142 | |
| 40 | 143 Python packages related to graphs: |
| 144 | |
| 145 * graph-tool: http://en.wikipedia.org/wiki/Graph-tool , | |
| 43 | 146 https://pypi.python.org/pypi/graph-tool , |
| 147 http://projects.skewed.de/graph-tool/ | |
| 40 | 148 |
| 149 | |
| 150 External libraries and tools | |
| 151 | |
| 152 * Graphviz | |
| 153 * tulip: http://tulip.labri.fr/TulipDrupal/ | |
| 42 | 154 * GUESS: http://graphexploration.cond.org/ |
| 155 * Java Universal Network/Graph Framework : http://jung.sourceforge.net/ | |
| 43 | 156 * graphthing http://graph.seul.org/ |
| 157 * igraph http://igraph.sourceforge.net/ | |
| 40 | 158 |
| 42 | 159 See also http://k0s.org/links/?q=graph |
| 40 | 160 |
| 43 | 161 (And what is |
| 162 https://github.com/tinkerpop/blueprints/wiki/GraphML-Reader-and-Writer-Library ?) | |
| 40 | 163 |
| 164 Parallel Efforts | |
| 165 ---------------- | |
| 166 | |
| 167 * http://k0s.org/hg/IntentMadeManifest/ | |
| 168 | |
| 169 | |
| 170 | |
| 0 | 171 ---- |
| 172 | |
| 173 Jeff Hammel | |
| 174 | |
| 175 http://k0s.org/hg/WSGraph | |
| 176 |