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bake: Enable multiprocess baking. Baking is now done by running a worker per CPU, and sending jobs to them. This changes several things across the codebase: * Ability to not cache things related to pages other than the 'main' page (i.e. the page at the bottom of the execution stack). * Decouple the baking process from the bake records, so only the main process keeps track (and modifies) the bake record. * Remove the need for 'batch page getters' and loading a page directly from the page factories. There are various smaller changes too included here, including support for scope performance timers that are saved with the bake record and can be printed out to the console. Yes I got carried away. For testing, the in-memory 'mock' file-system doesn't work anymore, since we're spawning processes, so this is replaced by a 'tmpfs' file-system which is saved in temporary files on disk and deleted after tests have run.
author Ludovic Chabant <ludovic@chabant.com>
date Fri, 12 Jun 2015 17:09:19 -0700
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children
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1 ---
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2 title: Code
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3 header_class: code
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4 ---
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6 ## PieCrust plugins
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7
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8 To create a PieCrust plugin, you need to do a few things:
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9
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10 * Create a correct `setuptools` package.
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11 * Implement a sub-class of `PieCrustPlugin`.
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12 * Write a couple lines of boilerplate code.
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15 ### Packaging plugins
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17 PieCrust plugins are expected to be available on [Pypi][] for better integration
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18 with `chef` commands. For instance, the `chef plugins list -a` will list all
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19 PieCrust plugins from Pypi.
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21 A PieCrust plugin package must:
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22
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23 * Be named `PieCrust-FooBar`, where `FooBar` is the name of the plugin.
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24 * Have a module named `piecrust_foobar`, which is basically the lower-case
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25 version of the package name, with an underscore instead of a dash.
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26
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27 You can refer to the [`setuptools` documentation][st] for more information.
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29
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30 ### The plugin class
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31
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32 A PieCrust plugin is an instance of a class that derives from `PieCrustPlugin`.
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33 The only required thing you need to override is the name of the plugin:
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34
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35 from piecrust.plugins.base import PieCrustPlugin
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36
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37 class FooBarPlugin(PieCrustPlugin):
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38 name = 'FooBar'
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39
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40 The plugin class has a whole bunch of functions returning whatever your plugin
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41 may want to extend: formatters, template engines, `chef` commands, sources, etc.
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42 Each one of those returns an array of instances or classes, depending on the
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43 situation.
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44
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45 Check the `piecrust.plugins.builtin.BuiltInPlugin` to see how all PieCrust
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46 functionality is implemented.
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48
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49 ### Boilerplate code
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50
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51 Now we have a plugin class, and a Pypi package that PieCrust can find if needed.
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52 All we need is a way to tell PieCrust how to find your plugin class in that
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53 package.
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55 In the required `piecrust_foobar` module, you need to define a
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56 `__piecrust_plugin__` global variable that points to your plugin class:
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58 __piecrust_plugin__ = FooBarPlugin
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59
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60 That's what PieCrust will use to instantiate your plugin.
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63 ### Loading the plugin
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64
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65 Now you can add your plugin to a PieCrust website by adding this to the website
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66 configuration:
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68 site:
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69 plugins: foobar
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71 PieCrust will prepend `piecrust_` to each specified plugin name and attempt to
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72 load that as a module (`import piecrust_foobar`). If this succeeds, it will look
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73 for a `__piecrust_plugin__` in that module, and expect its value to be a class
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74 that inherits from `PieCrustPlugin`. If everything's OK, it will instantiate
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75 that class and query it for various services and components when necessary.
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78 [pypi]: https://pypi.python.org/pypi
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79 [st]: http://pythonhosted.org/setuptools/
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