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POThreading in a django app
 

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  1. POThreading in a django app
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    <p>I'm trying to create what I call a scrobbler. The task is to read a Delicious user from a queue, fetch all of their bookmarks and put them in the bookmarks queue. Then something should go through that queue, do some parsing and then store the data in a database.</p> <p>This obviously calls for threading because most of the time is spent waiting for Delicious to respond and then for bookmarked websites to respond and be passed through some API's and it would be silly for everything to wait for that.</p> <p>However I am having trouble with threading and keep getting strange errors like database tables not being defined. Any help is appreciated :)</p> <p>Here's the relevant code:</p> <pre><code># relevant model # class Bookmark(models.Model): account = models.ForeignKey( Delicious ) url = models.CharField( max_length=4096 ) tags = models.TextField() hash = models.CharField( max_length=32 ) meta = models.CharField( max_length=32 ) # bookmark queue reading # def scrobble_bookmark(account): try: bookmark = Bookmark.objects.all()[0] except Bookmark.DoesNotExist: return False bookmark.delete() tags = bookmark.tags.split(' ') user = bookmark.account.user for concept in Concepts.extract( bookmark.url ): for tag in tags: Concepts.relate( user, concept['name'], tag ) return True def scrobble_bookmarks(account): semaphore = Semaphore(10) for i in xrange(Bookmark.objects.count()): thread = Bookmark_scrobble(account, semaphore) thread.start() class Bookmark_scrobble(Thread): def __init__(self, account, semaphore): Thread.__init__(self) self.account = account self.semaphore = semaphore def run(self): self.semaphore.acquire() try: scrobble_bookmark(self.account) finally: self.semaphore.release() </code></pre> <p>This is the error I get:</p> <pre><code>Exception in thread Thread-65: Traceback (most recent call last): File "/usr/lib/python2.6/threading.py", line 525, in __bootstrap_inner self.run() File "/home/swizec/Documents/trees/bookmarklet_server/../bookmarklet_server/Scrobbler/Scrobbler.py", line 60, in run scrobble_bookmark(self.account) File "/home/swizec/Documents/trees/bookmarklet_server/../bookmarklet_server/Scrobbler/Scrobbler.py", line 28, in scrobble_bookmark bookmark = Bookmark.objects.all()[0] File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 152, in __getitem__ return list(qs)[0] File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 76, in __len__ self._result_cache.extend(list(self._iter)) File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 231, in iterator for row in self.query.results_iter(): File "/usr/local/lib/python2.6/dist-packages/django/db/models/sql/query.py", line 281, in results_iter for rows in self.execute_sql(MULTI): File "/usr/local/lib/python2.6/dist-packages/django/db/models/sql/query.py", line 2373, in execute_sql cursor.execute(sql, params) File "/usr/local/lib/python2.6/dist-packages/django/db/backends/sqlite3/base.py", line 193, in execute return Database.Cursor.execute(self, query, params) OperationalError: no such table: Scrobbler_bookmark </code></pre> <p>PS: all other tests depending on the same table pass with flying colours.</p>
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    1. USSwizec Teller
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    1. CO"what I call a scrobbler". Why is that in the question? I can't see how it helps.
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      1. USS.Lott
    2. COI guess it doesn't really, but it's there for completeness' sake.
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      1. USSwizec Teller
    3. COSince you said: "what I call a Scrobbler" and I feel funny today I'll ask this way: dude why not you run python manage.py syncdb?
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      1. USGuilherme David da Costa
 

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