mirror of
https://github.com/arsenetar/dupeguru.git
synced 2024-10-31 22:05:58 +00:00
137 lines
4.6 KiB
Python
137 lines
4.6 KiB
Python
# Created By: Virgil Dupras
|
|
# Created On: 2006/09/14
|
|
# Copyright 2012 Hardcoded Software (http://www.hardcoded.net)
|
|
#
|
|
# This software is licensed under the "BSD" License as described in the "LICENSE" file,
|
|
# which should be included with this package. The terms are also available at
|
|
# http://www.hardcoded.net/licenses/bsd_license
|
|
|
|
import os
|
|
import logging
|
|
import sqlite3 as sqlite
|
|
|
|
from ._cache import string_to_colors
|
|
|
|
def colors_to_string(colors):
|
|
"""Transform the 3 sized tuples 'colors' into a hex string.
|
|
|
|
[(0,100,255)] --> 0064ff
|
|
[(1,2,3),(4,5,6)] --> 010203040506
|
|
"""
|
|
return ''.join(['%02x%02x%02x' % (r,g,b) for r,g,b in colors])
|
|
|
|
# This function is an important bottleneck of dupeGuru PE. It has been converted to C.
|
|
# def string_to_colors(s):
|
|
# """Transform the string 's' in a list of 3 sized tuples.
|
|
# """
|
|
# result = []
|
|
# for i in xrange(0, len(s), 6):
|
|
# number = int(s[i:i+6], 16)
|
|
# result.append((number >> 16, (number >> 8) & 0xff, number & 0xff))
|
|
# return result
|
|
|
|
class Cache(object):
|
|
"""A class to cache picture blocks.
|
|
"""
|
|
def __init__(self, db=':memory:'):
|
|
self.dbname = db
|
|
self.con = None
|
|
self._create_con()
|
|
|
|
def __contains__(self, key):
|
|
sql = "select count(*) from pictures where path = ?"
|
|
result = self.con.execute(sql, [key]).fetchall()
|
|
return result[0][0] > 0
|
|
|
|
def __delitem__(self, key):
|
|
if key not in self:
|
|
raise KeyError(key)
|
|
sql = "delete from pictures where path = ?"
|
|
self.con.execute(sql, [key])
|
|
|
|
# Optimized
|
|
def __getitem__(self, key):
|
|
if isinstance(key, int):
|
|
sql = "select blocks from pictures where rowid = ?"
|
|
else:
|
|
sql = "select blocks from pictures where path = ?"
|
|
result = self.con.execute(sql, [key]).fetchone()
|
|
if result:
|
|
result = string_to_colors(result[0])
|
|
return result
|
|
else:
|
|
raise KeyError(key)
|
|
|
|
def __iter__(self):
|
|
sql = "select path from pictures"
|
|
result = self.con.execute(sql)
|
|
return (row[0] for row in result)
|
|
|
|
def __len__(self):
|
|
sql = "select count(*) from pictures"
|
|
result = self.con.execute(sql).fetchall()
|
|
return result[0][0]
|
|
|
|
def __setitem__(self, key, value):
|
|
value = colors_to_string(value)
|
|
if key in self:
|
|
sql = "update pictures set blocks = ? where path = ?"
|
|
else:
|
|
sql = "insert into pictures(blocks,path) values(?,?)"
|
|
try:
|
|
self.con.execute(sql, [value, key])
|
|
except sqlite.OperationalError:
|
|
logging.warning('Picture cache could not set value for key %r', key)
|
|
except sqlite.DatabaseError as e:
|
|
logging.warning('DatabaseError while setting value for key %r: %s', key, str(e))
|
|
|
|
def _create_con(self, second_try=False):
|
|
def create_tables():
|
|
sql = "create table pictures(path TEXT, blocks TEXT)"
|
|
self.con.execute(sql);
|
|
sql = "create index idx_path on pictures (path)"
|
|
self.con.execute(sql)
|
|
|
|
self.con = sqlite.connect(self.dbname, isolation_level=None)
|
|
try:
|
|
self.con.execute("select * from pictures where 1=2")
|
|
except sqlite.OperationalError: # new db
|
|
create_tables()
|
|
except sqlite.DatabaseError as e: # corrupted db
|
|
if second_try:
|
|
raise # Something really strange is happening
|
|
logging.warning('Could not create picture cache because of an error: %s', str(e))
|
|
self.con.close()
|
|
os.remove(self.dbname)
|
|
self._create_con(second_try=True)
|
|
|
|
def clear(self):
|
|
self.close()
|
|
if self.dbname != ':memory:':
|
|
os.remove(self.dbname)
|
|
self._create_con()
|
|
|
|
def close(self):
|
|
if self.con is not None:
|
|
self.con.close()
|
|
self.con = None
|
|
|
|
def filter(self, func):
|
|
to_delete = [key for key in self if not func(key)]
|
|
for key in to_delete:
|
|
del self[key]
|
|
|
|
def get_id(self, path):
|
|
sql = "select rowid from pictures where path = ?"
|
|
result = self.con.execute(sql, [path]).fetchone()
|
|
if result:
|
|
return result[0]
|
|
else:
|
|
raise ValueError(path)
|
|
|
|
def get_multiple(self, rowids):
|
|
sql = "select rowid, blocks from pictures where rowid in (%s)" % ','.join(map(str, rowids))
|
|
cur = self.con.execute(sql)
|
|
return ((rowid, string_to_colors(blocks)) for rowid, blocks in cur)
|
|
|