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annotate piecrust/pipelines/base.py @ 852:4850f8c21b6e

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core: Start of the big refactor for PieCrust 3.0. * Everything is a `ContentSource`, including assets directories. * Most content sources are subclasses of the base file-system source. * A source is processed by a "pipeline", and there are 2 built-in pipelines, one for assets and one for pages. The asset pipeline is vaguely functional, but the page pipeline is completely broken right now. * Rewrite the baking process as just running appropriate pipelines on each content item. This should allow for better parallelization.
author Ludovic Chabant <ludovic@chabant.com>
date Wed, 17 May 2017 00:11:48 -0700
parents
children f070a4fc033c
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852
4850f8c21b6e core: Start of the big refactor for PieCrust 3.0.
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1 import os.path
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2 import logging
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3
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4
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5 logger = logging.getLogger(__name__)
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7
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8 class PipelineContext:
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9 """ The context for running a content pipeline.
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10 """
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11 def __init__(self, out_dir, record_history, *,
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12 worker_id=-1, force=None):
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13 self.out_dir = out_dir
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14 self.record_history = record_history
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15 self.worker_id = worker_id
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16 self.force = force
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17
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18 @property
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19 def is_worker(self):
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20 """ Returns `True` if the content pipeline is running inside
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21 a worker process, and this is the first one.
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22 """
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23 return self.worker_id >= 0
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24
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25 @property
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26 def is_main_process(self):
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27 """ Returns `True` is the content pipeline is running inside
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28 the main process (and not a worker process). This is the case
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29 if there are no worker processes at all.
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30 """
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31 return self.worker_id < 0
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32
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33
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34 class PipelineResult:
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35 def __init__(self, record):
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36 self.record = record
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37
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38
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39 class ContentPipeline:
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40 """ A pipeline that processes content from a `ContentSource`.
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41 """
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42 PIPELINE_NAME = None
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43 PIPELINE_PASSES = 1
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44 RECORD_CLASS = None
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45
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46 def __init__(self, source):
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47 self.source = source
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48
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49 app = source.app
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50 tmp_dir = app.cache_dir
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51 if not tmp_dir:
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52 import tempfile
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53 tmp_dir = os.path.join(tempfile.gettempdir(), 'piecrust')
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54 self.tmp_dir = os.path.join(tmp_dir, self.PIPELINE_NAME)
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55
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56 @property
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57 def app(self):
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58 return self.source.app
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59
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60 def initialize(self, ctx):
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61 pass
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62
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63 def run(self, content_item, ctx, result):
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64 raise NotImplementedError()
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65
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66 def shutdown(self, ctx):
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67 pass
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68
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69 def collapseRecords(self, record_history):
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70 pass
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71
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72 def getDeletions(self, record_history):
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73 pass