openmedialibrary/oml/item/icons.py

191 lines
5 KiB
Python

# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
import os
import sqlite3
import tornado.concurrent
import tornado.gen
import tornado.ioloop
import tornado.web
from oxtornado import run_async
from settings import icons_db_path, static_path
from utils import resize_image
import db
import logging
logger = logging.getLogger(__name__)
class Icons(dict):
def __init__(self, db):
self._db = db
self.create()
def connect(self):
conn = sqlite3.connect(self._db, timeout=10)
return conn
def create(self):
conn = self.connect()
c = conn.cursor()
c.execute('CREATE TABLE IF NOT EXISTS icon (id varchar(64) unique, data blob)')
c.execute('CREATE TABLE IF NOT EXISTS setting (key varchar(256) unique, value text)')
if int(self.get_setting(c, 'version', 0)) < 1:
self.set_setting(c, 'version', 1)
def get_setting(self, c, key, default=None):
c.execute('SELECT value FROM setting WHERE key = ?', (key, ))
for row in c:
return row[0]
return default
def set_setting(self, c, key, value):
c.execute('INSERT OR REPLACE INTO setting values (?, ?)', (key, str(value)))
def default_cover(self):
with open(os.path.join(static_path, 'png', 'cover.png'), 'rb') as f:
data = f.read()
return data
def __getitem__(self, id, default=None):
sql = 'SELECT data FROM icon WHERE id=?'
conn = self.connect()
c = conn.cursor()
c.execute(sql, (id, ))
data = default
for row in c:
data = row[0]
break
c.close()
conn.close()
return data
def __setitem__(self, id, data):
sql = 'INSERT OR REPLACE INTO icon values (?, ?)'
conn = self.connect()
c = conn.cursor()
data = sqlite3.Binary(data)
c.execute(sql, (id, data))
conn.commit()
c.close()
conn.close()
def __delitem__(self, id):
sql = 'DELETE FROM icon WHERE id = ?'
conn = self.connect()
c = conn.cursor()
c.execute(sql, (id, ))
conn.commit()
c.close()
conn.close()
def clear(self, prefix):
sql = 'DELETE FROM icon WHERE id LIKE ?'
conn = self.connect()
c = conn.cursor()
c.execute(sql, (prefix + '%', ))
conn.commit()
c.close()
conn.close()
icons = Icons(icons_db_path)
def get_icon_sync(id, type_, size):
if size:
skey = '%s:%s:%s' % (type_, id, size)
data = icons[skey]
if data:
return bytes(data)
key = '%s:%s' % (type_, id)
data = icons[key]
if not data:
type_ = 'preview' if type_ == 'cover' else 'cover'
key = '%s:%s' % (type_, id)
if size:
skey = '%s:%s:%s' % (type_, id, size)
if size:
data = icons[skey]
if data:
size = None
if not data:
data = icons[key]
if not data:
skey = '%s:%s:%s' % ('default', 'cover', size)
if size:
data = icons[skey]
if data:
size = None
if not data:
data = icons.default_cover()
if size:
data = icons[skey] = resize_image(data, size=size)
size = None
if size:
data = icons[skey] = resize_image(data, size=size)
data = bytes(data) or ''
return data
@run_async
def get_icon(id, type_, size, callback):
callback(get_icon_sync(id, type_, size))
def clear_default_cover_cache():
icons.clear('default:cover:')
@run_async
def get_icon_app(id, type_, size, callback):
with db.session():
from item.models import Item
item = Item.get(id)
if not item:
data = ''
else:
if type_ == 'cover' and not item.meta.get('cover'):
type_ = 'preview'
if type_ == 'preview' and not item.files.count():
type_ = 'cover'
if size:
skey = '%s:%s:%s' % (type_, id, size)
key = '%s:%s' % (type_, id)
data = None
if size:
data = icons[skey]
if data:
size = None
if not data:
data = icons[key]
if not data:
data = icons.default_cover()
size = None
if size:
data = icons[skey] = resize_image(data, size=size)
data = bytes(data) or ''
callback(data)
class IconHandler(tornado.web.RequestHandler):
def initialize(self):
pass
@tornado.web.asynchronous
@tornado.gen.coroutine
def get(self, id, type_, size=None):
size = int(size) if size else None
if type_ not in ('cover', 'preview'):
self.set_status(404)
return
self.set_header('Content-Type', 'image/jpeg')
response = yield tornado.gen.Task(get_icon, id, type_, size)
if not response:
self.set_status(404)
return
if self._finished:
return
self.write(response)