Mercurial > hg > Feedworm

annotate backend/sqlalchemy/SqlAlchemyBackend.py @ 155:a05719a6175e

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move common functionality into an abstract backend class, have both backends inherit from it. Implement enough of the couchdb backend that reading feeds (and marking feed entries as read) is possible
author Dirk Olmes <dirk@xanthippe.ping.de>
date Sat, 27 Aug 2011 08:52:03 +0200
parents 2682db280be0
children a3c945ce434c
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1
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2 from Feed import Feed
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3 from FeedEntry import FeedEntry
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4 from Preferences import Preferences
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5 from backend.AbstractBackend import AbstractBackend
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6 from datetime import datetime, timedelta
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7 from sqlalchemy.orm import joinedload
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8 from sqlalchemy.sql import and_
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9 import Database
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10 import FeedUpdater
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11 import Mapping
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12 import logging
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13 import util
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15 class SqlAlchemyBackend(AbstractBackend):
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16 '''
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17 Backend that uses sqlalchemy for persistence
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18 '''
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20 def __init__(self):
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21 AbstractBackend.__init__(self)
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22 self._initLogging()
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23 self.session = Database.createSession()
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24 self.prefs = Preferences(self.session)
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25 self.updater = None
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27 def _initLogging(self):
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28 logging.getLogger("sqlalchemy.orm").setLevel(logging.WARN)
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30 sqlalchemyLogLevel = logging.ERROR
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31 if util.databaseLoggingEnabled():
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32 sqlalchemyLogLevel = logging.INFO
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33 logging.getLogger("sqlalchemy").setLevel(sqlalchemyLogLevel)
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35 def preferences(self):
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36 return self.prefs
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37
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38 def dispose(self):
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39 # save all uncommitted state, just in case
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40 self.session.commit()
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41 self.session.close()
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43 #
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44 # handling of feeds
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45 #
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47 def getFeeds(self):
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48 if self.preferences().showOnlyUnreadFeeds():
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49 self.feeds = self._getUnreadFeeds()
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50 else:
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51 self.feeds = Feed.all(self.session)
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52 return self.feeds
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53
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54 def _getUnreadFeeds(self):
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55 query = self.session.query(FeedEntry).filter(FeedEntry.read == 0)
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56 queryWithOptions = query.options(joinedload("feed"))
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57 result = queryWithOptions.all()
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58 return self._collectFeeds(result)
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59
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60 def _collectFeeds(self, feedEntries):
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61 feeds = [entry.feed for entry in feedEntries]
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62 uniqueFeeds = set(feeds)
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63 return list(uniqueFeeds)
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65 def _retrieveEntriesForSelectedFeed(self, hideReadEntries):
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66 return self.selectedFeed.entriesSortedByUpdateDate(hideReadEntries)
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67
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68 def markSelectedFeedAsRead(self):
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69 self.selectedFeed.markAllEntriesRead()
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70 self.session.commit()
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71
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72 def deleteSelectedFeed(self):
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73 self.session.delete(self.selectedFeed)
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74 self.session.commit()
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75
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76 def createFeed(self, url):
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77 try:
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78 FeedUpdater.createNewFeed(url, self.session)
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79 self.session.commit()
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80 except AttributeError as ae:
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81 self.session.rollback()
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82 raise ae
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83
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84 def updateAllFeeds(self):
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85 FeedUpdater.updateAllFeeds(self.session)
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86 self.session.commit()
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87
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88 def updateFeed(self, feed, changes):
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89 feed.takeChangesFrom(changes)
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90 feed.incrementNextUpdateDate()
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91 self.session.commit()
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92
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93 #
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94 # handling of the selected feed entry
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95 #
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97 def _markSelectedFeedEntryRead(self):
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98 self.selectedFeedEntry.markRead()
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99
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100 def markFeedEntriesAsRead(self, indices):
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101 for index in indices:
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102 self.feedEntries[index].markRead()
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103 self.session.commit()
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104
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105 def toggleSelectedFeedEntryRead(self):
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106 self.selectedFeedEntry.toggleRead()
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107 self.session.commit()
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108
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109 def expireFeedEntries(self):
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110 logger = logging.getLogger("feedupdater")
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111 expireDate = self._calculateExpireDate()
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112 logger.info("expiring entries older than " + str(expireDate))
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113 feedEntry = Mapping.feedEntryTable
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114 deleteStatement = feedEntry.delete().where(
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115 and_(feedEntry.c.create_timestamp < expireDate, feedEntry.c.read == 1)
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116 )
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117 deleteStatement.execute()
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118 self.session.commit()
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119
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120 def _calculateExpireDate(self):
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121 now = datetime.now()
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122 daysToKeepFeedEntries = self.prefs.daysToKeepFeedEntries()
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123 delta = timedelta(days=daysToKeepFeedEntries)
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124 return now - delta