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58d048198f
Unfortunately PQcancel blocks, so it's not better than PQgetResult. It has been suggested to use PQreset in non-blocking way but this would give the Python program the burden of handling a connection done but not configured in an unexpected place.
82 lines
1.7 KiB
Python
82 lines
1.7 KiB
Python
#!/usr/bin/env python
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"""Test for issue #113: test with error during green processing
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"""
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DSN = 'dbname=test'
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import eventlet.patcher
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eventlet.patcher.monkey_patch()
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import os
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import signal
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from time import sleep
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import psycopg2
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from psycopg2 import extensions
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from eventlet.hubs import trampoline
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# register a test wait callback that fails if SIGHUP is received
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panic = []
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def wait_cb(conn):
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"""A wait callback useful to allow eventlet to work with Psycopg."""
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while 1:
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if panic:
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raise Exception('whatever')
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state = conn.poll()
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if state == extensions.POLL_OK:
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break
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elif state == extensions.POLL_READ:
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trampoline(conn.fileno(), read=True)
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elif state == extensions.POLL_WRITE:
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trampoline(conn.fileno(), write=True)
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else:
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raise psycopg2.OperationalError(
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"Bad result from poll: %r" % state)
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extensions.set_wait_callback(wait_cb)
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# SIGHUP handler to inject a fail in the callback
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def handler(signum, frame):
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panic.append(True)
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signal.signal(signal.SIGHUP, handler)
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# Simulate another green thread working
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def worker():
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while 1:
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print "I'm working"
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sleep(1)
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eventlet.spawn(worker)
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# You can unplug the network cable etc. here.
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# Kill -HUP will raise an exception in the callback.
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print "PID", os.getpid()
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conn = psycopg2.connect(DSN)
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curs = conn.cursor()
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try:
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for i in range(1000):
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curs.execute("select %s, pg_sleep(1)", (i,))
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r = curs.fetchone()
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print "selected", r
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except BaseException, e:
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print "got exception:", e.__class__.__name__, e
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if conn.closed:
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print "the connection is closed"
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else:
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conn.rollback()
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curs.execute("select 1")
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print curs.fetchone()
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