Mercurial > hg > Feedworm

annotate backend/sqlalchemy/SqlAlchemyBackend.py @ 168:f4708d38419c

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move methods around so the SqlAlchemyBackend only needs to import the class
author dirk
date Mon, 05 Sep 2011 19:43:34 +0200
parents a3c945ce434c
children 3bcf39181f6e
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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 FeedUpdater import FeedUpdater
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5 from Preferences import Preferences
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6 from backend.AbstractBackend import AbstractBackend
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7 from datetime import datetime, timedelta
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8 from sqlalchemy.orm import joinedload
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9 from sqlalchemy.sql import and_
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10 import Database
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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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42
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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 newFeed = Feed(url)
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79 self.session.add(newFeed)
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80
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81 FeedUpdater(self.preferences(), self.session).update(newFeed)
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82 self.session.commit()
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83 except AttributeError as ae:
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84 self.session.rollback()
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85 raise ae
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86
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87 def updateAllFeeds(self):
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88 FeedUpdater.updateAllFeeds(self.preferences(), self.session)
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89 self.session.commit()
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90
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91 def updateFeed(self, feed, changes):
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92 feed.takeChangesFrom(changes)
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93 feed.incrementNextUpdateDate()
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94 self.session.commit()
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95
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96 #
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97 # handling of the selected feed entry
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98 #
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100 def _markSelectedFeedEntryRead(self):
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101 self.selectedFeedEntry.markRead()
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102
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103 def markFeedEntriesAsRead(self, indices):
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104 for index in indices:
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105 self.feedEntries[index].markRead()
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106 self.session.commit()
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107
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108 def toggleSelectedFeedEntryRead(self):
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109 self.selectedFeedEntry.toggleRead()
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110 self.session.commit()
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111
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112 def expireFeedEntries(self):
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113 logger = logging.getLogger("feedupdater")
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114 expireDate = self._calculateExpireDate()
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115 logger.info("expiring entries older than " + str(expireDate))
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116 feedEntry = Mapping.feedEntryTable
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117 deleteStatement = feedEntry.delete().where(
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118 and_(feedEntry.c.create_timestamp < expireDate, feedEntry.c.read == 1)
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119 )
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120 deleteStatement.execute()
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121 self.session.commit()
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122
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123 def _calculateExpireDate(self):
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124 now = datetime.now()
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125 daysToKeepFeedEntries = self.prefs.daysToKeepFeedEntries()
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126 delta = timedelta(days=daysToKeepFeedEntries)
32a173cb081c move updating the feeds to the backend
Dirk Olmes <dirk@xanthippe.ping.de>
parents: 126
diff changeset
127 return now - delta