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"""PyMySQL example"""
import asyncio
import socket
from pymysql import connections
from greenio import socket as greensocket
class GreenConnection(connections.Connection):
def _connect(self):
try:
if self.unix_socket:
raise NotImplementedError()
else:
sock = greensocket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((self.host, self.port))
self.host_info = "socket %s:%d" % (self.host, self.port)
if self.no_delay:
sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
self.socket = sock
self.rfile = self.socket.makefile("rb")
self.wfile = self.socket.makefile("wb")
self._get_server_information()
self._request_authentication()
self._send_autocommit_mode()
except socket.error as e:
raise Exception(
2003, "Can't connect to MySQL server on %r (%s)" % (
self.host, e.args[0]))
if __name__ == '__main__':
import greenio
import time
@asyncio.coroutine
def sleeper():
# show that we're not blocked
while True:
yield from asyncio.sleep(0.2)
print('.')
@greenio.task
def db():
conn = GreenConnection(host='localhost')
try:
with conn as cur:
print('>> sleeping')
st = time.monotonic()
cur.execute('SELECT SLEEP(2)')
en = time.monotonic() - st
assert en >= 2
print('<< sleeping {:.3f}s'.format(en))
cur.execute('SELECT 42')
print('"SELECT 42" -> {!r}'.format(cur.fetchone()))
print('>> sleeping')
st = time.monotonic()
cur.execute('SELECT SLEEP(1)')
en = time.monotonic() - st
assert en >= 1
print('<< sleeping {:.3f}s'.format(en))
finally:
conn.close()
@asyncio.coroutine
def run():
yield from asyncio.wait([db(), sleeper()],
return_when=asyncio.FIRST_COMPLETED)
asyncio.set_event_loop_policy(greenio.GreenEventLoopPolicy())
loop = asyncio.get_event_loop()
loop.run_until_complete(run())
loop.close()
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