Mercurial > hg > Feedworm

annotate backend/couchdb/CouchDbBackend.py @ 187:2f2016a10f7d

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handle a missing updated_parsed attribute in a feed entry gracefully
author dirk
date Tue, 13 Sep 2011 17:52:36 +0200
parents ac1de0a467fd
children e5d492595bdb
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1
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2 from FeedUpdater import FeedUpdater
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3 from Preferences import Preferences
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4 from backend.AbstractBackend import AbstractBackend
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5 from backend.couchdb import CouchDb
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6 from backend.couchdb.Feed import Feed
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7 from backend.couchdb.FeedEntry import FeedEntry
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8 import couchdb
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9 import logging
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11 class CouchDbBackend(AbstractBackend):
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12 '''
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13 Backend that uses CouchDB for persistence
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14 '''
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16 def __init__(self):
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17 CouchDb.init()
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18 server = self._initServer()
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19 self.database = server[CouchDb.database]
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20 self.prefs = None
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22 def _initServer(self):
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23 if CouchDb.database_url is not None:
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24 return couchdb.Server(CouchDb.database_url)
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25 else:
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26 return couchdb.Server()
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28 def preferences(self):
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29 if self.prefs is None:
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30 self.prefs = Preferences(self.database)
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31 return self.prefs
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33 #
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34 # handling of feeds
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35 #
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37 def getFeeds(self):
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38 if self.preferences().showOnlyUnreadFeeds():
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39 self.feeds = self._getUnreadFeeds()
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40 else:
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41 # make sure that the results are actually fetched into memory, otherwise we'll pass
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42 # a ViewResults instance around which is not what we want
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43 self.feeds = list(Feed.all(self.database))
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44 return self.feeds
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46 def _getUnreadFeeds(self):
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47 viewResults = self.database.view(CouchDb.feedsWithUnreadEntries(), group=True)
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48 feedsWithUnreadEntries = []
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49 for row in viewResults:
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50 feed = Feed.load(self.database, row["key"])
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51 feedsWithUnreadEntries.append(feed)
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52 return feedsWithUnreadEntries
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54 def _retrieveEntriesForSelectedFeed(self, hideReadEntries):
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55 viewResults = FeedEntry.entriesForFeed(self.selectedFeed, self.database)
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56 # TODO update date is a string ... convert to a ListDateTimeField for better sort support
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57 viewResults.sort(FeedEntry.compareByUpdateDate, reverse=True)
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58 if hideReadEntries:
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59 filterFunc = lambda feedEntry: feedEntry.read == False
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60 viewResults = filter(filterFunc, viewResults)
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61 return viewResults
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63 def markSelectedFeedAsRead(self):
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64 for feedEntry in self.entriesForSelectedFeed():
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65 feedEntry.markRead(self.database)
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67 #
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68 # handling of the selected feed entry
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69 #
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71 def _markSelectedFeedEntryRead(self):
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72 self.selectedFeedEntry.markRead(self.database)
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74 def toggleSelectedFeedEntryRead(self):
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75 self.selectedFeedEntry.toggleRead(self.database)
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78 def toggleRead(self, feedEntry):
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79 raise Exception("not yet implemented")
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81 def markAllEntriesRead(self, feed):
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82 raise Exception("not yet implemented")
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84 def createFeed(self, url):
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85 feed = Feed.create(url)
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86 feed.store(self.database)
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87 FeedUpdater(self.database, self.preferences()).update(feed)
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89 def updateFeed(self, feed, changes):
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90 for key in changes.keys():
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91 feed[key] = changes[key]
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92 feed.store(self.database)
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93
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94 def deleteSelectedFeed(self):
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95 viewResults = self.database.view(CouchDb.feedEntriesByFeed(), key=self.selectedFeed.id)
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96 for row in viewResults:
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97 del self.database[row.id]
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98 del self.database[self.selectedFeed.id]
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99
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100 def entriesForFeed(self, feed, hideReadEntries):
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101 viewName = CouchDb.feedEntriesByFeed()
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102 if hideReadEntries:
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103 viewName = CouchDb.unreadFeedEntriesByFeed()
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104 return list(FeedEntry.view(self.database, viewName))
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105
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106 def markFeedEntriesAsRead(self, indices):
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107 for index in indices:
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108 feedEntry = self.entriesForSelectedFeed()[index]
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109 feedEntry.markRead(self.database)
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110
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111 def updateAllFeeds(self):
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112 # TODO use a view instead of iterating all feeds
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113 allFeeds = Feed.all(self.database)
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114 for feed in allFeeds:
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115 if feed.needsUpdate():
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116 FeedUpdater(self.database, self.preferences()).update(feed)
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118 def expireFeedEntries(self):
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119 logger = logging.getLogger("expiry")
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120 expireDate = self._calculateExpireDate()
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121 logger.info("expiring entries older than " + str(expireDate))
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122 for entry in FeedEntry.getReadFeedEntriesOlderThan(expireDate, self.database):
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123 del self.database[entry.id]