84 lines
3.4 KiB
Plaintext
84 lines
3.4 KiB
Plaintext
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[[!meta author="spalax"]]
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[[!template id=plugin name=verboserpc author="[[Louis|spalax]]"]]
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Debugging [external plugins](//ikiwiki.info/plugins/write/external/) is a pain, as soon as RPC is involved… This kind-of plugin tries to make it a little bit less painful.
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It acts as a proxy between Ikiwiki and the plugin (which, for the record, is an executable program communicating with Ikiwiki using [XML RPC](http://www.xmlrpc.com/) on standard input/output), and logs everithing on standard error.
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[[!toc]]
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# Example
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A sample output of a wiki compilation is shown below.
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$ ikiwiki --setup wiki.setup --refresh --verbose
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-> <?xml version="1.0" encoding="utf-8"?><methodCall><methodName>import</methodName><params></params></methodCall>
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<- <?xml version='1.0'?>
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<- <methodCall>
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<- <methodName>hook</methodName>
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<- <params>
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<- <param>
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<- <value><string>call</string></value>
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<- </param>
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<- <param>
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<- <value><string>getsetup</string></value>
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<- </param>
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<- <param>
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<- <value><string>type</string></value>
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<- </param>
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<- <param>
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<- <value><string>getsetup</string></value>
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<- </param>
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<- <param>
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<- <value><string>id</string></value>
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<- </param>
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<- <param>
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<- <value><string>foo</string></value>
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<- </param>
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<- <param>
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<- <value><string>last</string></value>
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<- </param>
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<- <param>
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<- <value><boolean>0</boolean></value>
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<- </param>
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<- </params>
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<- </methodCall>
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-> <?xml version="1.0" encoding="utf-8"?><methodResponse><params><param><value><string>1</string></value></param></params></methodResponse>
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<- <?xml version='1.0'?>
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<- <methodResponse>
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<- <params>
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<- <param>
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<- <value><struct>
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<- <member>
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<- <name>null</name>
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<- <value><string></string></value>
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<- </member>
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<- </struct></value>
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<- </param>
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<- </params>
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<- </methodResponse>
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rebuilding wiki..
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scanning index.mdwn
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building index.mdwn
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done
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# Enabling the plugin
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Let us say you want to debug a plugin `foo`, located somewhere in your [`libdir`](https://ikiwiki.info/plugins/install/).
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1. Do not not enable plugin `foo` in the ikiwiki setup file.
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2. Create a symbolic link named `foo.verboserpc` in one of your `libdir`, linking to the `verboserpc` plugin.
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3. In your setup file, enable plugin `foo.verboserpc`.
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That's it. When called, the `verboserpc` plugin will be called as `foo.verboserpc`, and will run program `foo`, while transmitting (to Ikiwiki and `foo`) and logging (to standard error) any input/output.
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# Does it work?
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Well… External plugins are still a pain to debug, even with this tool. If your plugin is written using python, and you are using the [`proxy`](http://source.ikiwiki.branchable.com/?p=source.git;a=blob;f=plugins/proxy.py;h=b61eb466c8d47ef839fc24e5d0ba54be3a9b23fa;hb=HEAD), it might be useless, since this proxy already have an option to log RPC calls (by giving `debug_fn=sys.stderr.write` as an option to the constructor of [`IkiWikiProcedureProxy`](http://source.ikiwiki.branchable.com/?p=source.git;a=blob;f=plugins/proxy.py;h=b61eb466c8d47ef839fc24e5d0ba54be3a9b23fa;hb=HEAD#l217)).
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I am not sure that this plugin is the solution to the problem of debugging external plugins. I am still publishing it here, hoping that someone might improve it into something useful…
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# Download and install
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Code and documentation can be found here : [[https://atelier.gresille.org/projects/gresille-ikiwiki/wiki/VerboseRPC]].
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