mirror of
https://github.com/morpheus65535/bazarr
synced 2024-12-26 01:27:07 +00:00
219 lines
8.8 KiB
Python
219 lines
8.8 KiB
Python
# Copyright (c) 2014 Palantir Technologies
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
# of this software and associated documentation files (the "Software"), to deal
|
|
# in the Software without restriction, including without limitation the rights
|
|
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
# copies of the Software, and to permit persons to whom the Software is
|
|
# furnished to do so, subject to the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be included in
|
|
# all copies or substantial portions of the Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
# THE SOFTWARE.
|
|
|
|
"""Thread safe sqlite3 interface."""
|
|
|
|
__author__ = "Shawn Lee"
|
|
__email__ = "shawnl@palantir.com"
|
|
__license__ = "MIT"
|
|
|
|
import logging
|
|
try:
|
|
import queue as Queue # module re-named in Python 3
|
|
except ImportError:
|
|
import Queue
|
|
import sqlite3
|
|
import threading
|
|
import time
|
|
import uuid
|
|
|
|
LOGGER = logging.getLogger('sqlite3worker')
|
|
|
|
|
|
class Sqlite3Worker(threading.Thread):
|
|
"""Sqlite thread safe object.
|
|
|
|
Example:
|
|
from sqlite3worker import Sqlite3Worker
|
|
sql_worker = Sqlite3Worker("/tmp/test.sqlite")
|
|
sql_worker.execute(
|
|
"CREATE TABLE tester (timestamp DATETIME, uuid TEXT)")
|
|
sql_worker.execute(
|
|
"INSERT into tester values (?, ?)", ("2010-01-01 13:00:00", "bow"))
|
|
sql_worker.execute(
|
|
"INSERT into tester values (?, ?)", ("2011-02-02 14:14:14", "dog"))
|
|
sql_worker.execute("SELECT * from tester")
|
|
sql_worker.close()
|
|
"""
|
|
def __init__(self, file_name, max_queue_size=100, as_dict=False):
|
|
"""Automatically starts the thread.
|
|
|
|
Args:
|
|
file_name: The name of the file.
|
|
max_queue_size: The max queries that will be queued.
|
|
as_dict: Return result as a dictionary.
|
|
"""
|
|
threading.Thread.__init__(self)
|
|
self.daemon = True
|
|
self.sqlite3_conn = sqlite3.connect(
|
|
file_name, check_same_thread=False,
|
|
detect_types=sqlite3.PARSE_DECLTYPES)
|
|
if as_dict:
|
|
self.sqlite3_conn.row_factory = dict_factory
|
|
self.sqlite3_cursor = self.sqlite3_conn.cursor()
|
|
self.sql_queue = Queue.Queue(maxsize=max_queue_size)
|
|
self.results = {}
|
|
self.max_queue_size = max_queue_size
|
|
self.exit_set = False
|
|
# Token that is put into queue when close() is called.
|
|
self.exit_token = str(uuid.uuid4())
|
|
self.start()
|
|
self.thread_running = True
|
|
|
|
def run(self):
|
|
"""Thread loop.
|
|
|
|
This is an infinite loop. The iter method calls self.sql_queue.get()
|
|
which blocks if there are not values in the queue. As soon as values
|
|
are placed into the queue the process will continue.
|
|
|
|
If many executes happen at once it will churn through them all before
|
|
calling commit() to speed things up by reducing the number of times
|
|
commit is called.
|
|
"""
|
|
LOGGER.debug("run: Thread started")
|
|
execute_count = 0
|
|
for token, query, values, only_one, execute_many in iter(self.sql_queue.get, None):
|
|
LOGGER.debug("sql_queue: %s", self.sql_queue.qsize())
|
|
if token != self.exit_token:
|
|
LOGGER.debug("run: %s, %s", query, values)
|
|
self.run_query(token, query, values, only_one, execute_many)
|
|
execute_count += 1
|
|
# Let the executes build up a little before committing to disk
|
|
# to speed things up.
|
|
if (
|
|
self.sql_queue.empty() or
|
|
execute_count == self.max_queue_size):
|
|
LOGGER.debug("run: commit")
|
|
self.sqlite3_conn.commit()
|
|
execute_count = 0
|
|
# Only exit if the queue is empty. Otherwise keep getting
|
|
# through the queue until it's empty.
|
|
if self.exit_set and self.sql_queue.empty():
|
|
self.sqlite3_conn.commit()
|
|
self.sqlite3_conn.close()
|
|
self.thread_running = False
|
|
return
|
|
|
|
def run_query(self, token, query, values, only_one=False, execute_many=False):
|
|
"""Run a query.
|
|
|
|
Args:
|
|
token: A uuid object of the query you want returned.
|
|
query: A sql query with ? placeholders for values.
|
|
values: A tuple of values to replace "?" in query.
|
|
"""
|
|
if query.lower().strip().startswith("select"):
|
|
try:
|
|
self.sqlite3_cursor.execute(query, values)
|
|
if only_one:
|
|
self.results[token] = self.sqlite3_cursor.fetchone()
|
|
else:
|
|
self.results[token] = self.sqlite3_cursor.fetchall()
|
|
except sqlite3.Error as err:
|
|
# Put the error into the output queue since a response
|
|
# is required.
|
|
self.results[token] = (
|
|
"Query returned error: %s: %s: %s" % (query, values, err))
|
|
LOGGER.error(
|
|
"Query returned error: %s: %s: %s", query, values, err)
|
|
else:
|
|
try:
|
|
if execute_many:
|
|
self.sqlite3_cursor.executemany(query, values)
|
|
if query.lower().strip().startswith(("insert", "update", "delete")):
|
|
self.results[token] = self.sqlite3_cursor.rowcount
|
|
else:
|
|
self.sqlite3_cursor.execute(query, values)
|
|
if query.lower().strip().startswith(("insert", "update", "delete")):
|
|
self.results[token] = self.sqlite3_cursor.rowcount
|
|
except sqlite3.Error as err:
|
|
self.results[token] = (
|
|
"Query returned error: %s: %s: %s" % (query, values, err))
|
|
LOGGER.error(
|
|
"Query returned error: %s: %s: %s", query, values, err)
|
|
|
|
def close(self):
|
|
"""Close down the thread and close the sqlite3 database file."""
|
|
self.exit_set = True
|
|
self.sql_queue.put((self.exit_token, "", "", "", ""), timeout=5)
|
|
# Sleep and check that the thread is done before returning.
|
|
while self.thread_running:
|
|
time.sleep(.01) # Don't kill the CPU waiting.
|
|
|
|
@property
|
|
def queue_size(self):
|
|
"""Return the queue size."""
|
|
return self.sql_queue.qsize()
|
|
|
|
def query_results(self, token):
|
|
"""Get the query results for a specific token.
|
|
|
|
Args:
|
|
token: A uuid object of the query you want returned.
|
|
|
|
Returns:
|
|
Return the results of the query when it's executed by the thread.
|
|
"""
|
|
delay = .001
|
|
while True:
|
|
if token in self.results:
|
|
return_val = self.results[token]
|
|
del self.results[token]
|
|
return return_val
|
|
# Double back on the delay to a max of 8 seconds. This prevents
|
|
# a long lived select statement from trashing the CPU with this
|
|
# infinite loop as it's waiting for the query results.
|
|
LOGGER.debug("Sleeping: %s %s", delay, token)
|
|
time.sleep(delay)
|
|
if delay < 8:
|
|
delay += delay
|
|
|
|
def execute(self, query, values=None, only_one=False, execute_many=False):
|
|
"""Execute a query.
|
|
|
|
Args:
|
|
query: The sql string using ? for placeholders of dynamic values.
|
|
values: A tuple of values to be replaced into the ? of the query.
|
|
|
|
Returns:
|
|
If it's a select query it will return the results of the query.
|
|
"""
|
|
if self.exit_set:
|
|
LOGGER.debug("Exit set, not running: %s, %s", query, values)
|
|
return "Exit Called"
|
|
LOGGER.debug("execute: %s, %s", query, values)
|
|
values = values or []
|
|
# A token to track this query with.
|
|
token = str(uuid.uuid4())
|
|
# If it's a select we queue it up with a token to mark the results
|
|
# into the output queue so we know what results are ours.
|
|
if query.lower().strip().startswith(("select", "insert", "update", "delete")):
|
|
self.sql_queue.put((token, query, values, only_one, execute_many), timeout=5)
|
|
return self.query_results(token)
|
|
else:
|
|
self.sql_queue.put((token, query, values, only_one, execute_many), timeout=5)
|
|
|
|
|
|
def dict_factory(cursor, row):
|
|
d = {}
|
|
for idx, col in enumerate(cursor.description):
|
|
d[col[0]] = row[idx]
|
|
return d
|