1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
import asyncio
import collections
from typing import Deque, Set
from asyncmy.connection import Connection, connect
from asyncmy.contexts import _PoolAcquireContextManager, _PoolContextManager
class Pool(asyncio.AbstractServer):
"""Connection pool, just from aiomysql"""
def __init__(
self, minsize: int, maxsize: int, pool_recycle: int = 3600, echo: bool = False, **kwargs
):
if minsize < 0:
raise ValueError("minsize should be zero or greater")
if maxsize < minsize:
raise ValueError("maxsize should be not less than minsize")
self._minsize = minsize
self._loop = asyncio.get_event_loop()
self._conn_kwargs = {**kwargs, "echo": echo}
self._acquiring = 0
self._free: Deque[Connection] = collections.deque(maxlen=maxsize)
self._cond = asyncio.Condition()
self._used: Set[Connection] = set()
self._terminated: Set[Connection] = set()
self._closing = False
self._closed = False
self._echo = echo
self._recycle = int(pool_recycle)
@property
def echo(self):
return self._echo
@property
def cond(self):
return self._cond
@property
def minsize(self):
return self._minsize
@property
def maxsize(self):
return self._free.maxlen
@property
def size(self):
return self.freesize + len(self._used) + self._acquiring
@property
def freesize(self):
return len(self._free)
async def clear(self):
"""Close all free connections in pool."""
async with self._cond:
while self._free:
conn = self._free.popleft()
await conn.ensure_closed()
self._cond.notify()
def close(self):
"""Close pool.
Mark all pool connections to be closed on getting back to pool.
Closed pool doesn't allow one to acquire new connections.
"""
if self._closed:
return
self._closing = True
def terminate(self):
"""Terminate pool.
Close pool with instantly closing all acquired connections also.
"""
self.close()
for conn in list(self._used):
conn.close()
self._terminated.add(conn)
self._used.clear()
async def wait_closed(self):
"""Wait for closing all pool's connections."""
if self._closed:
return
if not self._closing:
raise RuntimeError(".wait_closed() should be called " "after .close()")
while self._free:
conn = self._free.popleft()
conn.close()
async with self._cond:
while self.size > self.freesize:
await self._cond.wait()
self._closed = True
def acquire(self):
"""Acquire free connection from the pool."""
coro = self._acquire()
return _PoolAcquireContextManager(coro, self)
async def _acquire(self):
if self._closing:
raise RuntimeError("Cannot acquire connection after closing pool")
async with self._cond:
while True:
await self.fill_free_pool(True)
if self._free:
conn = self._free.popleft()
self._used.add(conn)
return conn
else:
await self._cond.wait()
async def fill_free_pool(self, override_min: bool = False):
# iterate over free connections and remove timeouted ones
free_size = len(self._free)
n = 0
while n < free_size:
conn = self._free[-1]
if conn._reader.at_eof() or conn._reader.exception():
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
while self.size < self.minsize:
self._acquiring += 1
try:
conn = await connect(**self._conn_kwargs)
# raise exception if pool is closing
self._free.append(conn)
self._cond.notify()
finally:
self._acquiring -= 1
if self._free:
return
if override_min and self.size < self.maxsize:
self._acquiring += 1
try:
conn = await connect(**self._conn_kwargs)
# raise exception if pool is closing
self._free.append(conn)
self._cond.notify()
finally:
self._acquiring -= 1
async def _wakeup(self):
async with self._cond:
self._cond.notify()
def release(self, conn: Connection):
"""
Release free connection back to the connection pool.
This is **NOT** a coroutine.
"""
fut = self._loop.create_future()
fut.set_result(None)
if conn in self._terminated:
self._terminated.remove(conn)
return fut
self._used.remove(conn)
if conn.connected:
in_trans = conn.get_transaction_status()
if in_trans:
conn.close()
return fut
if self._closing:
conn.close()
else:
self._free.append(conn)
fut = self._loop.create_task(self._wakeup())
return fut
async def __aenter__(self):
return self
async def __aexit__(self, exc_type, exc_val, exc_tb):
self.close()
await self.wait_closed()
def create_pool(
minsize: int = 1, maxsize: int = 10, echo = False, pool_recycle: int = 3600, **kwargs
):
coro = _create_pool(
minsize = minsize, maxsize = maxsize, echo = echo, pool_recycle = pool_recycle, **kwargs
)
return _PoolContextManager(coro)
async def _create_pool(
minsize: int = 1, maxsize: int = 10, echo = False, pool_recycle: int = 3600, **kwargs
):
pool = Pool(
minsize = minsize, maxsize = maxsize, echo = echo, pool_recycle = pool_recycle, **kwargs
)
if minsize > 0:
async with pool.cond:
await pool.fill_free_pool(False)
return pool
|
