def test__returns_expected_arguments(self):
ifname = factory.make_name("eth")
service = NeighbourDiscoveryService(ifname, Mock())
args = service.getProcessParameters()
self.assertThat(args, HasLength(3))
self.assertTrue(args[0].endswith(b"maas-common"))
self.assertTrue(args[1], Equals(b"observe-arp"))
self.assertTrue(args[2], Equals(ifname.encode("utf-8")))
def test__protocol_logs_stderr(self):
logger = self.useFixture(TwistedLoggerFixture())
ifname = factory.make_name('eth')
service = NeighbourDiscoveryService(ifname, lambda _: None)
protocol = service.createProcessProtocol()
reactor.spawnProcess(protocol, b"sh", (b"sh", b"-c", b"exec cat >&2"))
protocol.transport.write(b"Lines written to stderr are logged\n"
b"with a prefix, with no exceptions.\n")
protocol.transport.closeStdin()
yield protocol.done
self.assertThat(
logger.output,
Equals("observe-arp[%s]: Lines written to stderr are logged\n"
"---\n"
"observe-arp[%s]: with a prefix, with no exceptions." %
(ifname, ifname)))
def test__restarts_process_after_finishing(self):
ifname = factory.make_name("eth")
service = NeighbourDiscoveryService(ifname, Mock())
mock_process_params = self.patch(service, "getProcessParameters")
mock_process_params.return_value = [b"/bin/echo", b"{}"]
service.clock = Clock()
service.startService()
# Wait for the protocol to finish
service.clock.advance(0.0)
yield service._protocol.done
# Advance the clock (should start the service again)
interval = service.step
service.clock.advance(interval)
# The Deferred should have been recreated.
self.assertThat(service._protocol.done, Not(IsFiredDeferred()))
yield service._protocol.done
service.stopService()