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import psycopg2
def pg_wait(conn, env, timeout=0):
while 1:
state = conn.poll()
if state == psycopg2.extensions.POLL_OK:
raise StopIteration
elif state == psycopg2.extensions.POLL_WRITE:
yield env['x-wsgiorg.fdevent.writable'](conn.fileno(), timeout)
elif state == psycopg2.extensions.POLL_READ:
yield env['x-wsgiorg.fdevent.readable'](conn.fileno(), timeout)
else:
raise psycopg2.OperationalError("poll() returned %s" % state)
def application(env, start_response):
start_response('200 OK', [('Content-Type', 'text/html')])
connection = psycopg2.connect(database='uwsgi',user='uwsgi',password='uwsgi',host='192.168.173.100', async=1)
for i in pg_wait(connection, env, 3):
yield i
print("connected")
cursor = connection.cursor()
cursor.execute("SELECT * FROM foo")
for i in pg_wait(cursor.connection, env, 3):
yield i
print("query result available")
for record in cursor:
yield str(record)
connection.close()