Merge pull request #216 from aio-libs/pool-recylce

Pool recylce

aiomysql/connection.py

@@ -163,6 +163,7 @@ def __init__(self, host="localhost", user=None, password="",
         self._db = db
         self._no_delay = no_delay
         self._echo = echo
+        self._last_usage = self._loop.time()
 
         self._unix_socket = unix_socket
         if charset:
@@ -240,6 +241,11 @@ def echo(self):
         """Return echo mode status."""
         return self._echo
 
+    @property
+    def last_usage(self):
+        """Return time() when connection was used."""
+        return self._last_usage
+
     @property
     def loop(self):
         return self._loop
@@ -375,6 +381,7 @@ def cursor(self, cursor=None):
         :raises TypeError: cursor_class is not a subclass of Cursor.
         """
         self._ensure_alive()
+        self._last_usage = self._loop.time()
         if cursor is not None and not issubclass(cursor, Cursor):
             raise TypeError('Custom cursor must be subclass of Cursor')
 

aiomysql/pool.py

@@ -10,19 +10,21 @@
                     _PoolAcquireContextManager, create_future, create_task)
 
 
-def create_pool(minsize=1, maxsize=10, echo=False, loop=None, **kwargs):
+def create_pool(minsize=1, maxsize=10, echo=False, pool_recycle=-1,
+                loop=None, **kwargs):
     coro = _create_pool(minsize=minsize, maxsize=maxsize, echo=echo,
-                        loop=loop, **kwargs)
+                        pool_recycle=pool_recycle, loop=loop, **kwargs)
     return _PoolContextManager(coro)
 
 
 @asyncio.coroutine
-def _create_pool(minsize=1, maxsize=10, echo=False, loop=None, **kwargs):
+def _create_pool(minsize=1, maxsize=10, echo=False, pool_recycle=-1,
+                 loop=None, **kwargs):
     if loop is None:
         loop = asyncio.get_event_loop()
 
-    pool = Pool(minsize=minsize, maxsize=maxsize, echo=echo, loop=loop,
-                **kwargs)
+    pool = Pool(minsize=minsize, maxsize=maxsize, echo=echo,
+                pool_recycle=pool_recycle, loop=loop, **kwargs)
     if minsize > 0:
         with (yield from pool._cond):
             yield from pool._fill_free_pool(False)
@@ -32,7 +34,7 @@ def _create_pool(minsize=1, maxsize=10, echo=False, loop=None, **kwargs):
 class Pool(asyncio.AbstractServer):
     """Connection pool"""
 
-    def __init__(self, minsize, maxsize, echo, loop, **kwargs):
+    def __init__(self, minsize, maxsize, echo, pool_recycle, loop, **kwargs):
         if minsize < 0:
             raise ValueError("minsize should be zero or greater")
         if maxsize < minsize:
@@ -48,6 +50,7 @@ def __init__(self, minsize, maxsize, echo, loop, **kwargs):
         self._closing = False
         self._closed = False
         self._echo = echo
+        self._recycle = pool_recycle
 
     @property
     def echo(self):
@@ -153,6 +156,12 @@ def _fill_free_pool(self, override_min):
             if conn._reader.at_eof():
                 self._free.pop()
                 conn.close()
+
+            elif (self._recycle > -1 and
+                  self._loop.time() - conn.last_usage > self._recycle):
+                self._free.pop()
+                conn.close()
+
             else:
                 self._free.rotate()
             n += 1

aiomysql/sa/engine.py

@@ -19,26 +19,27 @@
 
 
 def create_engine(minsize=1, maxsize=10, loop=None,
-                  dialect=_dialect, **kwargs):
+                  dialect=_dialect, pool_recycle=-1,  **kwargs):
     """A coroutine for Engine creation.
 
     Returns Engine instance with embedded connection pool.
 
     The pool has *minsize* opened connections to PostgreSQL server.
     """
     coro = _create_engine(minsize=minsize, maxsize=maxsize, loop=loop,
-                          dialect=dialect, **kwargs)
+                          dialect=dialect, pool_recycle=pool_recycle, **kwargs)
     return _EngineContextManager(coro)
 
 
 @asyncio.coroutine
 def _create_engine(minsize=1, maxsize=10, loop=None,
-                   dialect=_dialect, **kwargs):
+                   dialect=_dialect, pool_recycle=-1, **kwargs):
 
     if loop is None:
         loop = asyncio.get_event_loop()
     pool = yield from aiomysql.create_pool(minsize=minsize, maxsize=maxsize,
-                                           loop=loop, **kwargs)
+                                           loop=loop,
+                                           pool_recycle=pool_recycle, **kwargs)
     conn = yield from pool.acquire()
     try:
         return Engine(dialect, pool, **kwargs)

tests/test_pool.py

@@ -497,3 +497,24 @@ def test_cancelled_connection(pool_creator, loop):
         res = yield from cur2.fetchall()
         # If we receive [(1, 0)] - we retrieved old cursor's values
         assert list(res) == [(2, 0)]
+
+
+@asyncio.coroutine
+def test_pool_with_connection_recycling(pool_creator, loop):
+    pool = yield from pool_creator(minsize=1,
+                                   maxsize=1,
+                                   pool_recycle=3)
+    with (yield from pool) as conn:
+        cur = yield from conn.cursor()
+        yield from cur.execute('SELECT 1;')
+        val = yield from cur.fetchone()
+        assert (1,) == val
+
+    yield from asyncio.sleep(5, loop=loop)
+
+    assert 1 == pool.freesize
+    with (yield from pool) as conn:
+        cur = yield from conn.cursor()
+        yield from cur.execute('SELECT 1;')
+        val = yield from cur.fetchone()
+        assert (1,) == val