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# uwsgi --async 1000 --ugreen
import uwsgi
import psycopg2
def async_wait(conn):
# conn can be a connection or a cursor
if not hasattr(conn, 'poll'):
conn = conn.connection
# interesting part: suspend until ready
while True:
state = conn.poll()
if state == psycopg2.extensions.POLL_OK:
break
elif state == psycopg2.extensions.POLL_READ:
uwsgi.wait_fd_read(conn.fileno())
uwsgi.suspend()
elif state == psycopg2.extensions.POLL_WRITE:
uwsgi.wait_fd_write(conn.fileno())
uwsgi.suspend()
else:
raise Exception("Unexpected result from poll: %r", state)
def application(env, start_response):
start_response('200 Ok', [('Content-type', 'text/html')])
conn = psycopg2.connect("dbname=template1 user=postgres", async=True)
# suspend until connection
async_wait(conn)
curs = conn.cursor()
yield "<table>"
curs.execute("SELECT * FROM tests")
# suspend until result
async_wait(curs)
while True:
row = curs.fetchone()
if not row: break
yield "<tr><td>%s</td></tr>" % str(row)
yield "</table>"
conn.close()