mirror of
https://github.com/correl/dejavu.git
synced 2024-12-29 19:15:03 +00:00
Cleaned up the database driver.
- The SQLDatabase class now uses a context manager for mysql access. - Most of the error handling is done by the context manager now - Optimized several methods that returned a list into returning a generator - Optimized return_matches to use an IN query instead. - Other small fixes.
This commit is contained in:
Wessie
parent
f918b6b7e0
commit
0bd7219b87
2 changed files with 243 additions and 206 deletions
52
dejavu/cursor.py
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52
dejavu/cursor.py
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@ -0,0 +1,52 @@
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from __future__ import unicode_literals
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from __future__ import absolute_import
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import Queue
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import pymysql
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import pymysql.cursors
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def cursor_factory(**factory_options):
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def cursor(**options):
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options.update(factory_options)
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return Cursor(**options)
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return cursor
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class Cursor(object):
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"""
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Establishes a connection to the database and returns an open cursor.
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```python
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# Use as context manager
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with Cursor() as cur:
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cur.execute(query)
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```
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"""
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_cache = Queue.Queue(maxsize=5)
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def __init__(self, cursor_type=pymysql.cursors.DictCursor, **options):
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super(Cursor, self).__init__()
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try:
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conn = self._cache.get_nowait()
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except Queue.Empty:
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conn = pymysql.connect(**options)
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self.conn = conn
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self.cursor_type = cursor_type
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def __enter__(self):
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self.cursor = self.conn.cursor(self.cursor_type)
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return self.cursor
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def __exit__(self, type, value, traceback):
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self.cursor.close()
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self.conn.commit()
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# Put it back on the queue
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try:
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self._cache.put_nowait(self.conn)
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except Queue.Full:
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self.conn.close()
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@ -1,40 +1,44 @@
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import MySQLdb as mysql
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import MySQLdb.cursors as cursors
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import os
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from __future__ import absolute_import
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from binascii import unhexlify
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class SQLDatabase():
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class Database(object):
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def __init__(self):
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super(Database, self).__init__()
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class SQLDatabase(Database):
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"""
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Queries:
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1) Find duplicates (shouldn't be any, though):
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select `hash`, `song_id`, `offset`, count(*) cnt
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from fingerprints
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group by `hash`, `song_id`, `offset`
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select `hash`, `song_id`, `offset`, count(*) cnt
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from fingerprints
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group by `hash`, `song_id`, `offset`
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having cnt > 1
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order by cnt asc;
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2) Get number of hashes by song:
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select song_id, song_name, count(song_id) as num
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from fingerprints
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select song_id, song_name, count(song_id) as num
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from fingerprints
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natural join songs
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group by song_id
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group by song_id
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order by count(song_id) desc;
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3) get hashes with highest number of collisions
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select
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hash,
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count(distinct song_id) as n
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from fingerprints
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group by `hash`
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select
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hash,
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count(distinct song_id) as n
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from fingerprints
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group by `hash`
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order by n DESC;
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=> 26 different songs with same fingerprint (392 times):
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select songs.song_name, fingerprints.offset
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from fingerprints natural join songs
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select songs.song_name, fingerprints.offset
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from fingerprints natural join songs
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where fingerprints.hash = "08d3c833b71c60a7b620322ac0c0aba7bf5a3e73";
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"""
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@ -57,269 +61,250 @@ class SQLDatabase():
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FIELD_FINGERPRINTED = "fingerprinted"
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# creates
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CREATE_FINGERPRINTS_TABLE = """
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CREATE TABLE IF NOT EXISTS `%s` (
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`%s` binary(10) not null,
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`%s` mediumint unsigned not null,
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`%s` int unsigned not null,
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CREATE_FINGERPRINTS_TABLE = """
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CREATE TABLE IF NOT EXISTS `%s` (
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`%s` binary(10) not null,
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`%s` mediumint unsigned not null,
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`%s` int unsigned not null,
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INDEX(%s),
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UNIQUE(%s, %s, %s)
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);""" % (FINGERPRINTS_TABLENAME, FIELD_HASH,
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FIELD_SONG_ID, FIELD_OFFSET, FIELD_HASH,
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FIELD_SONG_ID, FIELD_OFFSET, FIELD_HASH)
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);""" % (
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FINGERPRINTS_TABLENAME, FIELD_HASH,
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FIELD_SONG_ID, FIELD_OFFSET, FIELD_HASH,
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FIELD_SONG_ID, FIELD_OFFSET, FIELD_HASH,
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)
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CREATE_SONGS_TABLE = """
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CREATE TABLE IF NOT EXISTS `%s` (
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`%s` mediumint unsigned not null auto_increment,
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`%s` varchar(250) not null,
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`%s` tinyint default 0,
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CREATE TABLE IF NOT EXISTS `%s` (
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`%s` mediumint unsigned not null auto_increment,
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`%s` varchar(250) not null,
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`%s` tinyint default 0,
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PRIMARY KEY (`%s`),
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UNIQUE KEY `%s` (`%s`)
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);""" % (SONGS_TABLENAME, FIELD_SONG_ID, FIELD_SONGNAME, FIELD_FINGERPRINTED,
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FIELD_SONG_ID, FIELD_SONG_ID, FIELD_SONG_ID)
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);""" % (
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SONGS_TABLENAME, FIELD_SONG_ID, FIELD_SONGNAME, FIELD_FINGERPRINTED,
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FIELD_SONG_ID, FIELD_SONG_ID, FIELD_SONG_ID,
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)
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# inserts (ignores duplicates)
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INSERT_FINGERPRINT = """
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INSERT IGNORE INTO %s (%s, %s, %s) VALUES
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(UNHEX(%%s), %%s, %%s);
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""" % (FINGERPRINTS_TABLENAME, FIELD_HASH, FIELD_SONG_ID, FIELD_OFFSET)
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# inserts
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INSERT_FINGERPRINT = "INSERT IGNORE INTO %s (%s, %s, %s) VALUES (UNHEX(%%s), %%s, %%s)" % (
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FINGERPRINTS_TABLENAME, FIELD_HASH, FIELD_SONG_ID, FIELD_OFFSET) # ignore duplicates and don't insert them
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INSERT_SONG = "INSERT INTO %s (%s) VALUES (%%s);" % (
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SONGS_TABLENAME, FIELD_SONGNAME)
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# selects
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SELECT = "SELECT %s, %s FROM %s WHERE %s = UNHEX(%%s);" % (FIELD_SONG_ID, FIELD_OFFSET, FINGERPRINTS_TABLENAME, FIELD_HASH)
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SELECT_ALL = "SELECT %s, %s FROM %s;" % (FIELD_SONG_ID, FIELD_OFFSET, FINGERPRINTS_TABLENAME)
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SELECT_SONG = "SELECT %s FROM %s WHERE %s = %%s" % (FIELD_SONGNAME, SONGS_TABLENAME, FIELD_SONG_ID)
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SELECT_NUM_FINGERPRINTS = "SELECT COUNT(*) as n FROM %s" % (FINGERPRINTS_TABLENAME)
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SELECT_UNIQUE_SONG_IDS = "SELECT COUNT(DISTINCT %s) as n FROM %s WHERE %s = 1;" % (FIELD_SONG_ID, SONGS_TABLENAME, FIELD_FINGERPRINTED)
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SELECT_SONGS = "SELECT %s, %s FROM %s WHERE %s = 1;" % (FIELD_SONG_ID, FIELD_SONGNAME, SONGS_TABLENAME, FIELD_FINGERPRINTED)
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SELECT = """
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SELECT %s, %s FROM %s WHERE %s = UNHEX(%%s);
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""" % (FIELD_SONG_ID, FIELD_OFFSET, FINGERPRINTS_TABLENAME, FIELD_HASH)
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SELECT_MULTIPLE = """
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SELECT HEX(%s), %s, %s FROM %s WHERE %s IN (%%s);
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""" % (FIELD_HASH, FIELD_SONG_ID, FIELD_OFFSET,
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FINGERPRINTS_TABLENAME, FIELD_HASH)
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SELECT_ALL = """
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SELECT %s, %s FROM %s;
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""" % (FIELD_SONG_ID, FIELD_OFFSET, FINGERPRINTS_TABLENAME)
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SELECT_SONG = """
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SELECT %s FROM %s WHERE %s = %%s
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""" % (FIELD_SONGNAME, SONGS_TABLENAME, FIELD_SONG_ID)
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SELECT_NUM_FINGERPRINTS = """
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SELECT COUNT(*) as n FROM %s
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""" % (FINGERPRINTS_TABLENAME)
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SELECT_UNIQUE_SONG_IDS = """
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SELECT COUNT(DISTINCT %s) as n FROM %s WHERE %s = 1;
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""" % (FIELD_SONG_ID, SONGS_TABLENAME, FIELD_FINGERPRINTED)
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SELECT_SONGS = """
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SELECT %s, %s FROM %s WHERE %s = 1;
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""" % (FIELD_SONG_ID, FIELD_SONGNAME, SONGS_TABLENAME, FIELD_FINGERPRINTED)
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# drops
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DROP_FINGERPRINTS = "DROP TABLE IF EXISTS %s;" % FINGERPRINTS_TABLENAME
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DROP_SONGS = "DROP TABLE IF EXISTS %s;" % SONGS_TABLENAME
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# update
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UPDATE_SONG_FINGERPRINTED = "UPDATE %s SET %s = 1 WHERE %s = %%s" % (SONGS_TABLENAME, FIELD_FINGERPRINTED, FIELD_SONG_ID)
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UPDATE_SONG_FINGERPRINTED = """
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UPDATE %s SET %s = 1 WHERE %s = %%s
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""" % (SONGS_TABLENAME, FIELD_FINGERPRINTED, FIELD_SONG_ID)
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# delete
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DELETE_UNFINGERPRINTED = "DELETE FROM %s WHERE %s = 0;" % (SONGS_TABLENAME, FIELD_FINGERPRINTED)
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DELETE_UNFINGERPRINTED = """
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DELETE FROM %s WHERE %s = 0;
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""" % (SONGS_TABLENAME, FIELD_FINGERPRINTED)
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DELETE_ORPHANS = """
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delete from fingerprints
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where not exists (
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select * from songs where fingerprints.song_id = songs.song_id
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)"""
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def __init__(self, hostname, username, password, database):
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# connect
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self.database = database
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try:
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# http://www.halfcooked.com/mt/archives/000969.html
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self.connection = mysql.connect(
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hostname, username, password,
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database, cursorclass=cursors.DictCursor)
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delete from fingerprints
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where not exists (
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select * from songs where fingerprints.song_id = songs.song_id
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);
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"""
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self.connection.autocommit(False) # for fast bulk inserts
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self.cursor = self.connection.cursor()
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except mysql.Error, e:
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print "Connection error %d: %s" % (e.args[0], e.args[1])
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def __init__(self, cursor):
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super(SQLDatabase, self).__init__()
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self.cursor = cursor
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def setup(self):
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try:
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# create fingerprints table
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self.cursor.execute("USE %s;" % self.database)
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self.cursor.execute(SQLDatabase.CREATE_FINGERPRINTS_TABLE)
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self.cursor.execute(SQLDatabase.CREATE_SONGS_TABLE)
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self.delete_unfingerprinted_songs()
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self.connection.commit()
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except mysql.Error, e:
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print "Connection error %d: %s" % (e.args[0], e.args[1])
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self.connection.rollback()
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with self.cursor() as cur:
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cur.execute(self.CREATE_FINGERPRINTS_TABLE)
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cur.execute(self.CREATE_SONGS_TABLE)
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cur.execute(self.DELETE_UNFINGERPRINTED)
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def empty(self):
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"""
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Drops all tables and re-adds them. Be carfeul with this!
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"""
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try:
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self.cursor.execute("USE %s;" % self.database)
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with self.cursor() as cur:
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cur.execute(self.DROP_FINGERPRINTS)
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cur.execute(self.DROP_SONGS)
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# drop tables
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self.cursor.execute(SQLDatabase.DROP_FINGERPRINTS)
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self.cursor.execute(SQLDatabase.DROP_SONGS)
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self.setup()
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# recreate
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self.cursor.execute(SQLDatabase.CREATE_FINGERPRINTS_TABLE)
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self.cursor.execute(SQLDatabase.CREATE_SONGS_TABLE)
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self.connection.commit()
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except mysql.Error, e:
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print "Error in empty(), %d: %s" % (e.args[0], e.args[1])
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self.connection.rollback()
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def delete_orphans(self):
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try:
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self.cursor = self.connection.cursor()
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### TODO: SQLDatabase.DELETE_ORPHANS is not performant enough, need better query
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### to delete fingerprints for which no song is tied to.
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#self.cursor.execute(SQLDatabase.DELETE_ORPHANS)
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#self.connection.commit()
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except mysql.Error, e:
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print "Error in delete_orphans(), %d: %s" % (e.args[0], e.args[1])
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self.connection.rollback()
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# TODO: SQLDatabase.DELETE_ORPHANS is not
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# performant enough, need better query to
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# delete fingerprints for which no song is tied to.
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# with self.cursor() as cur:
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# cur.execute(self.DELETE_ORPHANS)
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pass
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def delete_unfingerprinted_songs(self):
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try:
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self.cursor = self.connection.cursor()
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self.cursor.execute(SQLDatabase.DELETE_UNFINGERPRINTED)
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self.connection.commit()
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except mysql.Error, e:
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print "Error in delete_unfingerprinted_songs(), %d: %s" % (e.args[0], e.args[1])
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self.connection.rollback()
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with self.cursor() as cur:
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cur.execute(self.DELETE_UNFINGERPRINTED)
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def get_num_songs(self):
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"""
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Returns number of songs the database has fingerprinted.
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Returns number of songs the database has fingerprinted.
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"""
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try:
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self.cursor = self.connection.cursor()
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self.cursor.execute(SQLDatabase.SELECT_UNIQUE_SONG_IDS)
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record = self.cursor.fetchone()
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return int(record['n'])
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except mysql.Error, e:
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print "Error in get_num_songs(), %d: %s" % (e.args[0], e.args[1])
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with self.cursor() as cur:
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cur.execute(self.SELECT_UNIQUE_SONG_IDS)
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for row in cur:
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return row['n']
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def get_num_fingerprints(self):
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"""
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Returns number of fingerprints the database has fingerprinted.
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Returns number of fingerprints the database has fingerprinted.
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"""
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try:
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self.cursor = self.connection.cursor()
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self.cursor.execute(SQLDatabase.SELECT_NUM_FINGERPRINTS)
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record = self.cursor.fetchone()
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return int(record['n'])
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except mysql.Error, e:
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print "Error in get_num_songs(), %d: %s" % (e.args[0], e.args[1])
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with self.cursor() as cur:
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cur.execute(self.SELECT_NUM_FINGERPRINTS)
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def set_song_fingerprinted(self, song_id):
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for row in cur:
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return row['n']
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def set_song_fingerprinted(self, sid):
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"""
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Set the fingerprinted flag to TRUE (1) once a song has been completely
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fingerprinted in the database.
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Set the fingerprinted flag to TRUE (1) once a song has been completely
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fingerprinted in the database.
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"""
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try:
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self.cursor = self.connection.cursor()
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self.cursor.execute(SQLDatabase.UPDATE_SONG_FINGERPRINTED, song_id)
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self.connection.commit()
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except mysql.Error, e:
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print "Error in set_song_fingerprinted(), %d: %s" % (e.args[0], e.args[1])
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self.connection.rollback()
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with self.cursor() as cur:
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cur.execute(self.UPDATE_SONG_FINGERPRINTED, (sid,))
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def get_songs(self):
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"""
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Return songs that have the fingerprinted flag set TRUE (1).
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Return songs that have the fingerprinted flag set TRUE (1).
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"""
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try:
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self.cursor.execute(SQLDatabase.SELECT_SONGS)
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return self.cursor.fetchall()
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except mysql.Error, e:
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print "Error in get_songs(), %d: %s" % (e.args[0], e.args[1])
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return None
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with self.cursor() as cur:
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cur.execute(self.SELECT_SONGS)
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for row in cur:
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yield row
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def get_song_by_id(self, sid):
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"""
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Returns song by its ID.
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Returns song by its ID.
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"""
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try:
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self.cursor.execute(SQLDatabase.SELECT_SONG, (sid,))
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return self.cursor.fetchone()
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except mysql.Error, e:
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print "Error in get_songs(), %d: %s" % (e.args[0], e.args[1])
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return None
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with self.cursor() as cur:
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cur.execute(self.SELECT_SONG, (sid,))
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return cur.fetchone()
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def insert(self, key, value):
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def insert(self, hash, sid, offset):
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"""
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Insert a (sha1, song_id, offset) row into database.
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key is a sha1 hash, value = (song_id, offset)
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Insert a (sha1, song_id, offset) row into database.
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"""
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try:
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args = (key, value[0], value[1])
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self.cursor.execute(SQLDatabase.INSERT_FINGERPRINT, args)
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except mysql.Error, e:
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print "Error in insert(), %d: %s" % (e.args[0], e.args[1])
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self.connection.rollback()
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with self.cursor() as cur:
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cur.execute(self.INSERT_FINGERPRINT, (hash, sid, offset))
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def insert_song(self, songname):
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"""
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Inserts song in the database and returns the ID of the inserted record.
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Inserts song in the database and returns the ID of the inserted record.
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"""
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try:
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self.cursor.execute(SQLDatabase.INSERT_SONG, (songname,))
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self.connection.commit()
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return int(self.cursor.lastrowid)
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except mysql.Error, e:
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print "Error in insert_song(), %d: %s" % (e.args[0], e.args[1])
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self.connection.rollback()
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return None
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with self.cursor() as cur:
|
||||
cur.execute(self.INSERT_SONG, (songname,))
|
||||
return cur.lastrowid
|
||||
|
||||
def query(self, key):
|
||||
def query(self, hash):
|
||||
"""
|
||||
Return all tuples associated with hash.
|
||||
Return all tuples associated with hash.
|
||||
|
||||
If hash is None, returns all entries in the
|
||||
database (be careful with that one!).
|
||||
If hash is None, returns all entries in the
|
||||
database (be careful with that one!).
|
||||
"""
|
||||
# select all if no key
|
||||
if key is not None:
|
||||
sql = SQLDatabase.SELECT
|
||||
else:
|
||||
sql = SQLDatabase.SELECT_ALL
|
||||
query = self.SELECT_ALL if hash is None else self.SELECT
|
||||
|
||||
matches = []
|
||||
try:
|
||||
self.cursor.execute(sql, (key,))
|
||||
|
||||
# collect all matches
|
||||
records = self.cursor.fetchall()
|
||||
for record in records:
|
||||
matches.append((record[SQLDatabase.FIELD_SONG_ID], record[SQLDatabase.FIELD_OFFSET]))
|
||||
|
||||
except mysql.Error, e:
|
||||
print "Error in query(), %d: %s" % (e.args[0], e.args[1])
|
||||
|
||||
return matches
|
||||
with self.cursor() as cur:
|
||||
cur.execute(query)
|
||||
for row in cur:
|
||||
yield (row[self.FIELD_SONG_ID], row[self.FIELD_OFFSET])
|
||||
|
||||
def get_iterable_kv_pairs(self):
|
||||
"""
|
||||
Returns all tuples in database.
|
||||
Returns all tuples in database.
|
||||
"""
|
||||
return self.query(None)
|
||||
|
||||
def insert_hashes(self, hashes):
|
||||
"""
|
||||
Insert series of hash => song_id, offset
|
||||
values into the database.
|
||||
Insert series of hash => song_id, offset
|
||||
values into the database.
|
||||
"""
|
||||
for h in hashes:
|
||||
sha1, val = h
|
||||
self.insert(sha1, val)
|
||||
self.connection.commit()
|
||||
# TODO: Fix this when hashes will be a new format.
|
||||
values = []
|
||||
for hash, (sid, offset) in hashes:
|
||||
values.append((hash, sid, offset))
|
||||
|
||||
with self.cursor() as cur:
|
||||
cur.executemany(self.INSERT_FINGERPRINT, values)
|
||||
|
||||
def return_matches(self, hashes):
|
||||
"""
|
||||
Return the (song_id, offset_diff) tuples associated with
|
||||
a list of
|
||||
Return the (song_id, offset_diff) tuples associated with
|
||||
a list of
|
||||
|
||||
sha1 => (None, sample_offset)
|
||||
|
||||
values.
|
||||
"""
|
||||
matches = []
|
||||
for h in hashes:
|
||||
sha1, val = h
|
||||
list_of_tups = self.query(sha1)
|
||||
if list_of_tups:
|
||||
for t in list_of_tups:
|
||||
# (song_id, db_offset, song_sampled_offset)
|
||||
matches.append((t[0], t[1] - val[1]))
|
||||
return matches
|
||||
from pymysql.cursors import Cursor
|
||||
# Create a dictionary of hash => offset pairs for later lookups
|
||||
mapper = {}
|
||||
for hash, (_, offset) in hashes:
|
||||
mapper[hash.upper()] = offset
|
||||
|
||||
# Get an iteratable of all the hashes we need
|
||||
values = mapper.keys()
|
||||
|
||||
with self.cursor(cursor_type=Cursor) as cur:
|
||||
for split_values in grouper(values, 1000):
|
||||
# Create our IN part of the query
|
||||
query = self.SELECT_MULTIPLE
|
||||
query = query % ', '.join(['UNHEX(%s)'] * len(split_values))
|
||||
|
||||
cur.execute(query, split_values)
|
||||
|
||||
for hash, sid, offset in cur:
|
||||
# (sid, db_offset - song_sampled_offset)
|
||||
yield (sid, offset - mapper[hash])
|
||||
|
||||
|
||||
from itertools import izip_longest
|
||||
def grouper(iterable, n, fillvalue=None):
|
||||
args = [iter(iterable)] * n
|
||||
return izip_longest(fillvalue=fillvalue, *args)
|
||||
|
|
|
|||
Loading…
Reference in a new issue