Mercurial > hg > Feedworm

annotate backend/sqlalchemy/SqlAlchemyBackend.py @ 158:e8bb107a74e1

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all preferences are stored in a single JSON document in the couchdb backend. PreferencesDialog converts QString to a proper Python datatybe before sending it to the backend.
author dirk
date Mon, 29 Aug 2011 02:33:51 +0200
parents a05719a6175e
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