mirror of
https://github.com/correl/dejavu.git
synced 2024-11-23 19:19:53 +00:00
Cleaned up database.py
- Moved SQLDatabase to a SQL specific file - Database class is now an abstract base class - Cursor moved into SQL specific file - Allowed for multi-database support in the future
This commit is contained in:
Wessie
parent
ec823f56e4
commit
f276efdf32
4 changed files with 472 additions and 306 deletions
|
|
@ -1,4 +1,4 @@
|
|||
from dejavu.database import SQLDatabase
|
||||
from dejavu.database import get_database
|
||||
import dejavu.decoder as decoder
|
||||
import fingerprint
|
||||
from multiprocessing import Process, cpu_count
|
||||
|
|
@ -13,8 +13,9 @@ class Dejavu(object):
|
|||
self.config = config
|
||||
|
||||
# initialize db
|
||||
self.db = SQLDatabase(**config.get("database", {}))
|
||||
db_cls = get_database(config.get("database_type", None))
|
||||
|
||||
self.db = db_cls(**config.get("database", {}))
|
||||
self.db.setup()
|
||||
|
||||
# get songs previously indexed
|
||||
|
|
|
|||
|
|
@ -1,59 +0,0 @@
|
|||
from __future__ import unicode_literals
|
||||
from __future__ import absolute_import
|
||||
import Queue
|
||||
|
||||
import MySQLdb as mysql
|
||||
import MySQLdb.cursors
|
||||
|
||||
|
||||
def cursor_factory(**factory_options):
|
||||
def cursor(**options):
|
||||
options.update(factory_options)
|
||||
return Cursor(**options)
|
||||
return cursor
|
||||
|
||||
|
||||
class Cursor(object):
|
||||
"""
|
||||
Establishes a connection to the database and returns an open cursor.
|
||||
|
||||
|
||||
```python
|
||||
# Use as context manager
|
||||
with Cursor() as cur:
|
||||
cur.execute(query)
|
||||
```
|
||||
"""
|
||||
_cache = Queue.Queue(maxsize=5)
|
||||
|
||||
def __init__(self, cursor_type=mysql.cursors.Cursor, **options):
|
||||
super(Cursor, self).__init__()
|
||||
|
||||
try:
|
||||
conn = self._cache.get_nowait()
|
||||
except Queue.Empty:
|
||||
conn = mysql.connect(**options)
|
||||
else:
|
||||
# Ping the connection before using it from the cache.
|
||||
conn.ping(True)
|
||||
|
||||
self.conn = conn
|
||||
self.cursor_type = cursor_type
|
||||
|
||||
def __enter__(self):
|
||||
self.cursor = self.conn.cursor(self.cursor_type)
|
||||
return self.cursor
|
||||
|
||||
def __exit__(self, extype, exvalue, traceback):
|
||||
# if we had a MySQL related error we try to rollback the cursor.
|
||||
if extype is mysql.MySQLError:
|
||||
self.cursor.rollback()
|
||||
|
||||
self.cursor.close()
|
||||
self.conn.commit()
|
||||
|
||||
# Put it back on the queue
|
||||
try:
|
||||
self._cache.put_nowait(self.conn)
|
||||
except Queue.Full:
|
||||
self.conn.close()
|
||||
|
|
@ -1,308 +1,166 @@
|
|||
from __future__ import absolute_import
|
||||
from itertools import izip_longest
|
||||
|
||||
from dejavu.cursor import cursor_factory
|
||||
from MySQLdb.cursors import DictCursor
|
||||
import abc
|
||||
|
||||
|
||||
class Database(object):
|
||||
__metaclass__ = abc.ABCMeta
|
||||
|
||||
# Name of your Database subclass, this is used in configuration
|
||||
# to refer to your class
|
||||
type = None
|
||||
|
||||
def __init__(self):
|
||||
super(Database, self).__init__()
|
||||
|
||||
|
||||
class SQLDatabase(Database):
|
||||
def before_fork(self):
|
||||
"""
|
||||
Queries:
|
||||
|
||||
1) Find duplicates (shouldn't be any, though):
|
||||
|
||||
select `hash`, `song_id`, `offset`, count(*) cnt
|
||||
from fingerprints
|
||||
group by `hash`, `song_id`, `offset`
|
||||
having cnt > 1
|
||||
order by cnt asc;
|
||||
|
||||
2) Get number of hashes by song:
|
||||
|
||||
select song_id, song_name, count(song_id) as num
|
||||
from fingerprints
|
||||
natural join songs
|
||||
group by song_id
|
||||
order by count(song_id) desc;
|
||||
|
||||
3) get hashes with highest number of collisions
|
||||
|
||||
select
|
||||
hash,
|
||||
count(distinct song_id) as n
|
||||
from fingerprints
|
||||
group by `hash`
|
||||
order by n DESC;
|
||||
|
||||
=> 26 different songs with same fingerprint (392 times):
|
||||
|
||||
select songs.song_name, fingerprints.offset
|
||||
from fingerprints natural join songs
|
||||
where fingerprints.hash = "08d3c833b71c60a7b620322ac0c0aba7bf5a3e73";
|
||||
Called before the database instance is given to the new process
|
||||
"""
|
||||
pass
|
||||
|
||||
# config keys
|
||||
CONNECTION = "connection"
|
||||
KEY_USERNAME = "username"
|
||||
KEY_DATABASE = "database"
|
||||
KEY_PASSWORD = "password"
|
||||
KEY_HOSTNAME = "hostname"
|
||||
def after_fork(self):
|
||||
"""
|
||||
Called after the database instance has been given to the new process
|
||||
|
||||
# tables
|
||||
FINGERPRINTS_TABLENAME = "fingerprints"
|
||||
SONGS_TABLENAME = "songs"
|
||||
|
||||
# fields
|
||||
FIELD_HASH = "hash"
|
||||
FIELD_SONG_ID = "song_id"
|
||||
FIELD_OFFSET = "offset"
|
||||
FIELD_SONGNAME = "song_name"
|
||||
FIELD_FINGERPRINTED = "fingerprinted"
|
||||
|
||||
# creates
|
||||
CREATE_FINGERPRINTS_TABLE = """
|
||||
CREATE TABLE IF NOT EXISTS `%s` (
|
||||
`%s` binary(10) not null,
|
||||
`%s` mediumint unsigned not null,
|
||||
`%s` int unsigned not null,
|
||||
PRIMARY KEY(%s),
|
||||
UNIQUE(%s, %s, %s),
|
||||
FOREIGN KEY (%s) REFERENCES %s(%s) ON DELETE CASCADE
|
||||
) ENGINE=INNODB;""" % (
|
||||
FINGERPRINTS_TABLENAME, FIELD_HASH,
|
||||
FIELD_SONG_ID, FIELD_OFFSET, FIELD_HASH,
|
||||
FIELD_SONG_ID, FIELD_OFFSET, FIELD_HASH,
|
||||
FIELD_SONG_ID, SONGS_TABLENAME, FIELD_SONG_ID
|
||||
)
|
||||
|
||||
CREATE_SONGS_TABLE = """
|
||||
CREATE TABLE IF NOT EXISTS `%s` (
|
||||
`%s` mediumint unsigned not null auto_increment,
|
||||
`%s` varchar(250) not null,
|
||||
`%s` tinyint default 0,
|
||||
PRIMARY KEY (`%s`),
|
||||
UNIQUE KEY `%s` (`%s`)
|
||||
) ENGINE=INNODB;""" % (
|
||||
SONGS_TABLENAME, FIELD_SONG_ID, FIELD_SONGNAME, FIELD_FINGERPRINTED,
|
||||
FIELD_SONG_ID, FIELD_SONG_ID, FIELD_SONG_ID,
|
||||
)
|
||||
|
||||
# inserts (ignores duplicates)
|
||||
INSERT_FINGERPRINT = """
|
||||
INSERT IGNORE INTO %s (%s, %s, %s) VALUES
|
||||
(UNHEX(%%s), %%s, %%s);
|
||||
""" % (FINGERPRINTS_TABLENAME, FIELD_HASH, FIELD_SONG_ID, FIELD_OFFSET)
|
||||
|
||||
INSERT_SONG = "INSERT INTO %s (%s) VALUES (%%s);" % (
|
||||
SONGS_TABLENAME, FIELD_SONGNAME)
|
||||
|
||||
# selects
|
||||
SELECT = """
|
||||
SELECT %s, %s FROM %s WHERE %s = UNHEX(%%s);
|
||||
""" % (FIELD_SONG_ID, FIELD_OFFSET, FINGERPRINTS_TABLENAME, FIELD_HASH)
|
||||
|
||||
SELECT_MULTIPLE = """
|
||||
SELECT HEX(%s), %s, %s FROM %s WHERE %s IN (%%s);
|
||||
""" % (FIELD_HASH, FIELD_SONG_ID, FIELD_OFFSET,
|
||||
FINGERPRINTS_TABLENAME, FIELD_HASH)
|
||||
|
||||
SELECT_ALL = """
|
||||
SELECT %s, %s FROM %s;
|
||||
""" % (FIELD_SONG_ID, FIELD_OFFSET, FINGERPRINTS_TABLENAME)
|
||||
|
||||
SELECT_SONG = """
|
||||
SELECT %s FROM %s WHERE %s = %%s
|
||||
""" % (FIELD_SONGNAME, SONGS_TABLENAME, FIELD_SONG_ID)
|
||||
|
||||
SELECT_NUM_FINGERPRINTS = """
|
||||
SELECT COUNT(*) as n FROM %s
|
||||
""" % (FINGERPRINTS_TABLENAME)
|
||||
|
||||
SELECT_UNIQUE_SONG_IDS = """
|
||||
SELECT COUNT(DISTINCT %s) as n FROM %s WHERE %s = 1;
|
||||
""" % (FIELD_SONG_ID, SONGS_TABLENAME, FIELD_FINGERPRINTED)
|
||||
|
||||
SELECT_SONGS = """
|
||||
SELECT %s, %s FROM %s WHERE %s = 1;
|
||||
""" % (FIELD_SONG_ID, FIELD_SONGNAME, SONGS_TABLENAME, FIELD_FINGERPRINTED)
|
||||
|
||||
# drops
|
||||
DROP_FINGERPRINTS = "DROP TABLE IF EXISTS %s;" % FINGERPRINTS_TABLENAME
|
||||
DROP_SONGS = "DROP TABLE IF EXISTS %s;" % SONGS_TABLENAME
|
||||
|
||||
# update
|
||||
UPDATE_SONG_FINGERPRINTED = """
|
||||
UPDATE %s SET %s = 1 WHERE %s = %%s
|
||||
""" % (SONGS_TABLENAME, FIELD_FINGERPRINTED, FIELD_SONG_ID)
|
||||
|
||||
# delete
|
||||
DELETE_UNFINGERPRINTED = """
|
||||
DELETE FROM %s WHERE %s = 0;
|
||||
""" % (SONGS_TABLENAME, FIELD_FINGERPRINTED)
|
||||
|
||||
def __init__(self, **options):
|
||||
super(SQLDatabase, self).__init__()
|
||||
self.cursor = cursor_factory(**options)
|
||||
This will be called in the new process.
|
||||
"""
|
||||
pass
|
||||
|
||||
def setup(self):
|
||||
"""
|
||||
Creates any non-existing tables required for dejavu to function.
|
||||
|
||||
This also removes all songs that have been added but have no
|
||||
fingerprints associated with them.
|
||||
Called on creation or shortly afterwards.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.CREATE_SONGS_TABLE)
|
||||
cur.execute(self.CREATE_FINGERPRINTS_TABLE)
|
||||
cur.execute(self.DELETE_UNFINGERPRINTED)
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def empty(self):
|
||||
"""
|
||||
Drops tables created by dejavu and then creates them again
|
||||
by calling `SQLDatabase.setup`.
|
||||
|
||||
.. warning:
|
||||
This will result in a loss of data
|
||||
Called when the database should be cleared of all data.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.DROP_FINGERPRINTS)
|
||||
cur.execute(self.DROP_SONGS)
|
||||
|
||||
self.setup()
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def delete_unfingerprinted_songs(self):
|
||||
"""
|
||||
Removes all songs that have no fingerprints associated with them.
|
||||
Called to remove any song entries that do not have any fingerprints
|
||||
associated with them.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.DELETE_UNFINGERPRINTED)
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def get_num_songs(self):
|
||||
"""
|
||||
Returns number of songs the database has fingerprinted.
|
||||
Returns the amount of songs in the database.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.SELECT_UNIQUE_SONG_IDS)
|
||||
|
||||
for count, in cur:
|
||||
return count
|
||||
return 0
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def get_num_fingerprints(self):
|
||||
"""
|
||||
Returns number of fingerprints the database has fingerprinted.
|
||||
Returns the number of fingerprints in the database.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.SELECT_NUM_FINGERPRINTS)
|
||||
|
||||
for count, in cur:
|
||||
return count
|
||||
return 0
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def set_song_fingerprinted(self, sid):
|
||||
"""
|
||||
Set the fingerprinted flag to TRUE (1) once a song has been completely
|
||||
fingerprinted in the database.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.UPDATE_SONG_FINGERPRINTED, (sid,))
|
||||
Sets a specific song as having all fingerprints in the database.
|
||||
|
||||
sid: Song identifier
|
||||
"""
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def get_songs(self):
|
||||
"""
|
||||
Return songs that have the fingerprinted flag set TRUE (1).
|
||||
Returns all fully fingerprinted songs in the database.
|
||||
"""
|
||||
with self.cursor(cursor_type=DictCursor) as cur:
|
||||
cur.execute(self.SELECT_SONGS)
|
||||
for row in cur:
|
||||
yield row
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def get_song_by_id(self, sid):
|
||||
"""
|
||||
Returns song by its ID.
|
||||
"""
|
||||
with self.cursor(cursor_type=DictCursor) as cur:
|
||||
cur.execute(self.SELECT_SONG, (sid,))
|
||||
return cur.fetchone()
|
||||
Return a song by its identifier
|
||||
|
||||
sid: Song identifier
|
||||
"""
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def insert(self, hash, sid, offset):
|
||||
"""
|
||||
Insert a (sha1, song_id, offset) row into database.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.INSERT_FINGERPRINT, (hash, sid, offset))
|
||||
Inserts a single fingerprint into the database.
|
||||
|
||||
def insert_song(self, songname):
|
||||
hash: Part of a sha1 hash, in hexadecimal format
|
||||
sid: Song identifier this fingerprint is off
|
||||
offset: The offset this hash is from
|
||||
"""
|
||||
Inserts song in the database and returns the ID of the inserted record.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.INSERT_SONG, (songname,))
|
||||
return cur.lastrowid
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def insert_song(self, song_name):
|
||||
"""
|
||||
Inserts a song name into the database, returns the new
|
||||
identifier of the song.
|
||||
|
||||
song_name: The name of the song.
|
||||
"""
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def query(self, hash):
|
||||
"""
|
||||
Return all tuples associated with hash.
|
||||
Returns all matching fingerprint entries associated with
|
||||
the given hash as parameter.
|
||||
|
||||
If hash is None, returns all entries in the
|
||||
database (be careful with that one!).
|
||||
hash: Part of a sha1 hash, in hexadecimal format
|
||||
"""
|
||||
# select all if no key
|
||||
query = self.SELECT_ALL if hash is None else self.SELECT
|
||||
|
||||
with self.cursor() as cur:
|
||||
cur.execute(query)
|
||||
for sid, offset in cur:
|
||||
yield (sid, offset)
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def get_iterable_kv_pairs(self):
|
||||
"""
|
||||
Returns all tuples in database.
|
||||
Returns all fingerprints in the database.
|
||||
"""
|
||||
return self.query(None)
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def insert_hashes(self, sid, hashes):
|
||||
"""
|
||||
Insert series of hash => song_id, offset
|
||||
values into the database.
|
||||
Insert a multitude of fingerprints.
|
||||
|
||||
sid: Song identifier the fingerprints belong to
|
||||
hashes: A sequence of tuples in the format (hash, offset)
|
||||
- hash: Part of a sha1 hash, in hexadecimal format
|
||||
- offset: Offset this hash was created from/at.
|
||||
"""
|
||||
values = []
|
||||
for hash, offset in hashes:
|
||||
values.append((hash, sid, offset))
|
||||
|
||||
with self.cursor() as cur:
|
||||
cur.executemany(self.INSERT_FINGERPRINT, values)
|
||||
pass
|
||||
|
||||
@abc.abstractmethod
|
||||
def return_matches(self, hashes):
|
||||
"""
|
||||
Return the (song_id, offset_diff) tuples associated with
|
||||
a list of (sha1, sample_offset) values.
|
||||
Searches the database for pairs of (hash, offset) values.
|
||||
|
||||
hashes: A sequence of tuples in the format (hash, offset)
|
||||
- hash: Part of a sha1 hash, in hexadecimal format
|
||||
- offset: Offset this hash was created from/at.
|
||||
|
||||
Returns a sequence of (sid, offset_difference) tuples.
|
||||
|
||||
sid: Song identifier
|
||||
offset_difference: (offset - database_offset)
|
||||
"""
|
||||
# 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() 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])
|
||||
pass
|
||||
|
||||
|
||||
def grouper(iterable, n, fillvalue=None):
|
||||
args = [iter(iterable)] * n
|
||||
return izip_longest(fillvalue=fillvalue, *args)
|
||||
def get_database(database_type=None):
|
||||
# Default to using the mysql database
|
||||
database_type = database_type or "mysql"
|
||||
# Lower all the input.
|
||||
database_type = database_type.lower()
|
||||
|
||||
for db_cls in Database.__subclasses__():
|
||||
if db_cls.type == database_type:
|
||||
return db_cls
|
||||
|
||||
raise TypeError("Unsupported database type supplied.")
|
||||
|
|
|
|||
366
dejavu/database_sql.py
Normal file
366
dejavu/database_sql.py
Normal file
|
|
@ -0,0 +1,366 @@
|
|||
from __future__ import absolute_import
|
||||
from itertools import izip_longest
|
||||
import Queue
|
||||
|
||||
import MySQLdb as mysql
|
||||
from MySQLdb.cursors import DictCursor
|
||||
|
||||
from dejavu.database import Database
|
||||
|
||||
|
||||
class SQLDatabase(Database):
|
||||
"""
|
||||
Queries:
|
||||
|
||||
1) Find duplicates (shouldn't be any, though):
|
||||
|
||||
select `hash`, `song_id`, `offset`, count(*) cnt
|
||||
from fingerprints
|
||||
group by `hash`, `song_id`, `offset`
|
||||
having cnt > 1
|
||||
order by cnt asc;
|
||||
|
||||
2) Get number of hashes by song:
|
||||
|
||||
select song_id, song_name, count(song_id) as num
|
||||
from fingerprints
|
||||
natural join songs
|
||||
group by song_id
|
||||
order by count(song_id) desc;
|
||||
|
||||
3) get hashes with highest number of collisions
|
||||
|
||||
select
|
||||
hash,
|
||||
count(distinct song_id) as n
|
||||
from fingerprints
|
||||
group by `hash`
|
||||
order by n DESC;
|
||||
|
||||
=> 26 different songs with same fingerprint (392 times):
|
||||
|
||||
select songs.song_name, fingerprints.offset
|
||||
from fingerprints natural join songs
|
||||
where fingerprints.hash = "08d3c833b71c60a7b620322ac0c0aba7bf5a3e73";
|
||||
"""
|
||||
|
||||
type = "mysql"
|
||||
|
||||
# tables
|
||||
FINGERPRINTS_TABLENAME = "fingerprints"
|
||||
SONGS_TABLENAME = "songs"
|
||||
|
||||
# fields
|
||||
FIELD_HASH = "hash"
|
||||
FIELD_SONG_ID = "song_id"
|
||||
FIELD_OFFSET = "offset"
|
||||
FIELD_SONGNAME = "song_name"
|
||||
FIELD_FINGERPRINTED = "fingerprinted"
|
||||
|
||||
# creates
|
||||
CREATE_FINGERPRINTS_TABLE = """
|
||||
CREATE TABLE IF NOT EXISTS `%s` (
|
||||
`%s` binary(10) not null,
|
||||
`%s` mediumint unsigned not null,
|
||||
`%s` int unsigned not null,
|
||||
PRIMARY KEY(%s),
|
||||
UNIQUE(%s, %s, %s),
|
||||
FOREIGN KEY (%s) REFERENCES %s(%s) ON DELETE CASCADE
|
||||
) ENGINE=INNODB;""" % (
|
||||
FINGERPRINTS_TABLENAME, FIELD_HASH,
|
||||
FIELD_SONG_ID, FIELD_OFFSET, FIELD_HASH,
|
||||
FIELD_SONG_ID, FIELD_OFFSET, FIELD_HASH,
|
||||
FIELD_SONG_ID, SONGS_TABLENAME, FIELD_SONG_ID
|
||||
)
|
||||
|
||||
CREATE_SONGS_TABLE = """
|
||||
CREATE TABLE IF NOT EXISTS `%s` (
|
||||
`%s` mediumint unsigned not null auto_increment,
|
||||
`%s` varchar(250) not null,
|
||||
`%s` tinyint default 0,
|
||||
PRIMARY KEY (`%s`),
|
||||
UNIQUE KEY `%s` (`%s`)
|
||||
) ENGINE=INNODB;""" % (
|
||||
SONGS_TABLENAME, FIELD_SONG_ID, FIELD_SONGNAME, FIELD_FINGERPRINTED,
|
||||
FIELD_SONG_ID, FIELD_SONG_ID, FIELD_SONG_ID,
|
||||
)
|
||||
|
||||
# inserts (ignores duplicates)
|
||||
INSERT_FINGERPRINT = """
|
||||
INSERT IGNORE INTO %s (%s, %s, %s) values
|
||||
(UNHEX(%%s), %%s, %%s);
|
||||
""" % (FINGERPRINTS_TABLENAME, FIELD_HASH, FIELD_SONG_ID, FIELD_OFFSET)
|
||||
|
||||
INSERT_SONG = "INSERT INTO %s (%s) values (%%s);" % (
|
||||
SONGS_TABLENAME, FIELD_SONGNAME)
|
||||
|
||||
# selects
|
||||
SELECT = """
|
||||
SELECT %s, %s FROM %s WHERE %s = UNHEX(%%s);
|
||||
""" % (FIELD_SONG_ID, FIELD_OFFSET, FINGERPRINTS_TABLENAME, FIELD_HASH)
|
||||
|
||||
SELECT_MULTIPLE = """
|
||||
SELECT HEX(%s), %s, %s FROM %s WHERE %s IN (%%s);
|
||||
""" % (FIELD_HASH, FIELD_SONG_ID, FIELD_OFFSET,
|
||||
FINGERPRINTS_TABLENAME, FIELD_HASH)
|
||||
|
||||
SELECT_ALL = """
|
||||
SELECT %s, %s FROM %s;
|
||||
""" % (FIELD_SONG_ID, FIELD_OFFSET, FINGERPRINTS_TABLENAME)
|
||||
|
||||
SELECT_SONG = """
|
||||
SELECT %s FROM %s WHERE %s = %%s
|
||||
""" % (FIELD_SONGNAME, SONGS_TABLENAME, FIELD_SONG_ID)
|
||||
|
||||
SELECT_NUM_FINGERPRINTS = """
|
||||
SELECT COUNT(*) as n FROM %s
|
||||
""" % (FINGERPRINTS_TABLENAME)
|
||||
|
||||
SELECT_UNIQUE_SONG_IDS = """
|
||||
SELECT COUNT(DISTINCT %s) as n FROM %s WHERE %s = 1;
|
||||
""" % (FIELD_SONG_ID, SONGS_TABLENAME, FIELD_FINGERPRINTED)
|
||||
|
||||
SELECT_SONGS = """
|
||||
SELECT %s, %s FROM %s WHERE %s = 1;
|
||||
""" % (FIELD_SONG_ID, FIELD_SONGNAME, SONGS_TABLENAME, FIELD_FINGERPRINTED)
|
||||
|
||||
# drops
|
||||
DROP_FINGERPRINTS = "DROP TABLE IF EXISTS %s;" % FINGERPRINTS_TABLENAME
|
||||
DROP_SONGS = "DROP TABLE IF EXISTS %s;" % SONGS_TABLENAME
|
||||
|
||||
# update
|
||||
UPDATE_SONG_FINGERPRINTED = """
|
||||
UPDATE %s SET %s = 1 WHERE %s = %%s
|
||||
""" % (SONGS_TABLENAME, FIELD_FINGERPRINTED, FIELD_SONG_ID)
|
||||
|
||||
# delete
|
||||
DELETE_UNFINGERPRINTED = """
|
||||
DELETE FROM %s WHERE %s = 0;
|
||||
""" % (SONGS_TABLENAME, FIELD_FINGERPRINTED)
|
||||
|
||||
def __init__(self, **options):
|
||||
super(SQLDatabase, self).__init__()
|
||||
self.cursor = cursor_factory(**options)
|
||||
self._options = options
|
||||
|
||||
def after_fork(self):
|
||||
# Clear the cursor cache, we don't want any stale connections from
|
||||
# the previous process.
|
||||
Cursor.clear_cache()
|
||||
|
||||
def setup(self):
|
||||
"""
|
||||
Creates any non-existing tables required for dejavu to function.
|
||||
|
||||
This also removes all songs that have been added but have no
|
||||
fingerprints associated with them.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.CREATE_SONGS_TABLE)
|
||||
cur.execute(self.CREATE_FINGERPRINTS_TABLE)
|
||||
cur.execute(self.DELETE_UNFINGERPRINTED)
|
||||
|
||||
def empty(self):
|
||||
"""
|
||||
Drops tables created by dejavu and then creates them again
|
||||
by calling `SQLDatabase.setup`.
|
||||
|
||||
.. warning:
|
||||
This will result in a loss of data
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.DROP_FINGERPRINTS)
|
||||
cur.execute(self.DROP_SONGS)
|
||||
|
||||
self.setup()
|
||||
|
||||
def delete_unfingerprinted_songs(self):
|
||||
"""
|
||||
Removes all songs that have no fingerprints associated with them.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.DELETE_UNFINGERPRINTED)
|
||||
|
||||
def get_num_songs(self):
|
||||
"""
|
||||
Returns number of songs the database has fingerprinted.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.SELECT_UNIQUE_SONG_IDS)
|
||||
|
||||
for count, in cur:
|
||||
return count
|
||||
return 0
|
||||
|
||||
def get_num_fingerprints(self):
|
||||
"""
|
||||
Returns number of fingerprints the database has fingerprinted.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.SELECT_NUM_FINGERPRINTS)
|
||||
|
||||
for count, in cur:
|
||||
return count
|
||||
return 0
|
||||
|
||||
def set_song_fingerprinted(self, sid):
|
||||
"""
|
||||
Set the fingerprinted flag to TRUE (1) once a song has been completely
|
||||
fingerprinted in the database.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.UPDATE_SONG_FINGERPRINTED, (sid,))
|
||||
|
||||
def get_songs(self):
|
||||
"""
|
||||
Return songs that have the fingerprinted flag set TRUE (1).
|
||||
"""
|
||||
with self.cursor(cursor_type=DictCursor) as cur:
|
||||
cur.execute(self.SELECT_SONGS)
|
||||
for row in cur:
|
||||
yield row
|
||||
|
||||
def get_song_by_id(self, sid):
|
||||
"""
|
||||
Returns song by its ID.
|
||||
"""
|
||||
with self.cursor(cursor_type=DictCursor) as cur:
|
||||
cur.execute(self.SELECT_SONG, (sid,))
|
||||
return cur.fetchone()
|
||||
|
||||
def insert(self, hash, sid, offset):
|
||||
"""
|
||||
Insert a (sha1, song_id, offset) row into database.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.INSERT_FINGERPRINT, (hash, sid, offset))
|
||||
|
||||
def insert_song(self, songname):
|
||||
"""
|
||||
Inserts song in the database and returns the ID of the inserted record.
|
||||
"""
|
||||
with self.cursor() as cur:
|
||||
cur.execute(self.INSERT_SONG, (songname,))
|
||||
return cur.lastrowid
|
||||
|
||||
def query(self, hash):
|
||||
"""
|
||||
Return all tuples associated with hash.
|
||||
|
||||
If hash is None, returns all entries in the
|
||||
database (be careful with that one!).
|
||||
"""
|
||||
# select all if no key
|
||||
query = self.SELECT_ALL if hash is None else self.SELECT
|
||||
|
||||
with self.cursor() as cur:
|
||||
cur.execute(query)
|
||||
for sid, offset in cur:
|
||||
yield (sid, offset)
|
||||
|
||||
def get_iterable_kv_pairs(self):
|
||||
"""
|
||||
Returns all tuples in database.
|
||||
"""
|
||||
return self.query(None)
|
||||
|
||||
def insert_hashes(self, sid, hashes):
|
||||
"""
|
||||
Insert series of hash => song_id, offset
|
||||
values into the database.
|
||||
"""
|
||||
values = []
|
||||
for hash, offset in hashes:
|
||||
values.append((hash, sid, offset))
|
||||
|
||||
with self.cursor() as cur:
|
||||
for split_values in grouper(values, 1000):
|
||||
cur.executemany(self.INSERT_FINGERPRINT, split_values)
|
||||
|
||||
def return_matches(self, hashes):
|
||||
"""
|
||||
Return the (song_id, offset_diff) tuples associated with
|
||||
a list of (sha1, sample_offset) values.
|
||||
"""
|
||||
# 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() 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])
|
||||
|
||||
|
||||
def grouper(iterable, n, fillvalue=None):
|
||||
args = [iter(iterable)] * n
|
||||
return izip_longest(fillvalue=fillvalue, *args)
|
||||
|
||||
|
||||
def cursor_factory(**factory_options):
|
||||
def cursor(**options):
|
||||
options.update(factory_options)
|
||||
return Cursor(**options)
|
||||
return cursor
|
||||
|
||||
|
||||
class Cursor(object):
|
||||
"""
|
||||
Establishes a connection to the database and returns an open cursor.
|
||||
|
||||
|
||||
```python
|
||||
# Use as context manager
|
||||
with Cursor() as cur:
|
||||
cur.execute(query)
|
||||
```
|
||||
"""
|
||||
_cache = Queue.Queue(maxsize=5)
|
||||
|
||||
def __init__(self, cursor_type=mysql.cursors.Cursor, **options):
|
||||
super(Cursor, self).__init__()
|
||||
|
||||
try:
|
||||
conn = self._cache.get_nowait()
|
||||
except Queue.Empty:
|
||||
conn = mysql.connect(**options)
|
||||
else:
|
||||
# Ping the connection before using it from the cache.
|
||||
conn.ping(True)
|
||||
|
||||
self.conn = conn
|
||||
self.conn.autocommit(False)
|
||||
self.cursor_type = cursor_type
|
||||
|
||||
@classmethod
|
||||
def clear_cache(cls):
|
||||
cls._cache = Queue.Queue(maxsize=5)
|
||||
|
||||
def __enter__(self):
|
||||
self.cursor = self.conn.cursor(self.cursor_type)
|
||||
return self.cursor
|
||||
|
||||
def __exit__(self, extype, exvalue, traceback):
|
||||
# if we had a MySQL related error we try to rollback the cursor.
|
||||
if extype is mysql.MySQLError:
|
||||
self.cursor.rollback()
|
||||
|
||||
self.cursor.close()
|
||||
self.conn.commit()
|
||||
|
||||
# Put it back on the queue
|
||||
try:
|
||||
self._cache.put_nowait(self.conn)
|
||||
except Queue.Full:
|
||||
self.conn.close()
|
||||
Loading…
Reference in a new issue