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# pylint: disable=invalid-name,protected-access
import asyncio
import sqlite3
import json
import logging
import aiosqlite
from .defaults import SQLITE_THREADS, SQLITE_TIMEOUT
from .base_cache import BaseCache, CacheEntry
class SqliteConnPool:
def __init__(self, threads, conn_args=(), conn_kwargs=None, init_queries=()):
self._threads = threads
self._conn_args = conn_args
self._conn_kwargs = conn_kwargs if conn_kwargs is not None else {}
self._init_queries = init_queries
self._free_conns = asyncio.Queue()
self._ready = False
self._stopped = False
async def _new_conn(self):
db = await aiosqlite.connect(*self._conn_args, **self._conn_kwargs)
try:
async with db.cursor() as cur:
for q in self._init_queries:
await cur.execute(q)
except:
await db.close()
raise
return db
async def prepare(self):
for _ in range(self._threads):
self._free_conns.put_nowait(await self._new_conn())
self._ready = True
async def stop(self):
self._ready = False
self._stopped = True
try:
while True:
db = self._free_conns.get_nowait()
await db.close()
except asyncio.QueueEmpty:
pass
def borrow(self, timeout=None):
if not self._ready:
raise RuntimeError("Pool not prepared!")
class PoolBorrow:
# pylint: disable=no-self-argument
def __init__(s):
s._conn = None
# pylint: disable=no-self-argument
async def __aenter__(s):
s._conn = await asyncio.wait_for(self._free_conns.get(),
timeout)
return s._conn
# pylint: disable=no-self-argument
async def __aexit__(s, exc_type, exc, tb):
if self._stopped:
await s._conn.close()
return
if exc_type is not None:
await s._conn.close()
s._conn = await self._new_conn()
self._free_conns.put_nowait(s._conn)
return PoolBorrow()
class SqliteCache(BaseCache):
def __init__(self, filename, *,
threads=SQLITE_THREADS, timeout=SQLITE_TIMEOUT):
self._filename = filename
self._threads = threads
self._timeout = timeout
self._last_proactive_fetch_ts_id = 1
sqlitelogger = logging.getLogger("aiosqlite")
if not sqlitelogger.hasHandlers(): # pragma: no cover
sqlitelogger.addHandler(logging.NullHandler())
self._pool = None
async def setup(self):
conn_init = [
"PRAGMA journal_mode=WAL",
"PRAGMA synchronous=NORMAL",
]
self._pool = SqliteConnPool(self._threads,
conn_args=(self._filename,),
conn_kwargs={
"timeout": self._timeout,
},
init_queries=conn_init)
await self._pool.prepare()
queries = [
"create table if not exists proactive_fetch_ts "
"(id integer primary key, last_fetch_ts integer)",
"create table if not exists sts_policy_cache "
"(domain text, ts integer, pol_id text, pol_body text)",
"create unique index if not exists sts_policy_domain on sts_policy_cache (domain)",
"create index if not exists sts_policy_domain_ts on sts_policy_cache (domain, ts)",
]
async with self._pool.borrow(self._timeout) as conn:
async with conn.cursor() as cur:
for q in queries:
await cur.execute(q)
await conn.commit()
async def get_proactive_fetch_ts(self):
async with self._pool.borrow(self._timeout) as conn:
async with conn.execute('select last_fetch_ts from '
'proactive_fetch_ts where id = ?',
(self._last_proactive_fetch_ts_id,)) as cur:
res = await cur.fetchone()
return int(res[0]) if res is not None else 0
async def set_proactive_fetch_ts(self, timestamp):
async with self._pool.borrow(self._timeout) as conn:
try:
await conn.execute('insert into proactive_fetch_ts (last_fetch_ts, id) '
'values (?, ?)',
(int(timestamp), self._last_proactive_fetch_ts_id))
await conn.commit()
except sqlite3.IntegrityError:
await conn.execute('update proactive_fetch_ts '
'set last_fetch_ts = ? where id = ?',
(int(timestamp), self._last_proactive_fetch_ts_id))
await conn.commit()
async def get(self, key):
async with self._pool.borrow(self._timeout) as conn:
async with conn.execute('select ts, pol_id, pol_body from '
'sts_policy_cache where domain=?',
(key,)) as cur:
res = await cur.fetchone()
if res is not None:
ts, pol_id, pol_body = res
ts = int(ts)
pol_body = json.loads(pol_body)
return CacheEntry(ts, pol_id, pol_body)
else:
return None
async def set(self, key, value):
ts, pol_id, pol_body = value
pol_body = json.dumps(pol_body)
async with self._pool.borrow(self._timeout) as conn:
try:
await conn.execute('insert into sts_policy_cache (domain, ts, '
'pol_id, pol_body) values (?, ?, ?, ?)',
(key, int(ts), pol_id, pol_body))
await conn.commit()
except sqlite3.IntegrityError:
await conn.execute('update sts_policy_cache set ts = ?, '
'pol_id = ?, pol_body = ? where domain = ? '
'and ts < ?',
(int(ts), pol_id, pol_body, key, int(ts)))
await conn.commit()
async def scan(self, token, amount_hint):
if token is None:
token = 1
async with self._pool.borrow(self._timeout) as conn:
async with conn.execute('select rowid, ts, pol_id, pol_body, domain from '
'sts_policy_cache where rowid between ? and ?',
(token, token + amount_hint - 1)) as cur:
res = await cur.fetchall()
if res:
result = []
new_token = token
for row in res:
rowid, ts, pol_id, pol_body, domain = row
ts = int(ts)
rowid = int(rowid)
new_token = max(new_token, rowid)
pol_body = json.loads(pol_body)
result.append((domain, CacheEntry(ts, pol_id, pol_body)))
new_token += 1
return new_token, result
else:
return None, []
async def teardown(self):
await self._pool.stop()
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