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import re
import subprocess
import time
from unit.applications.lang.python import TestApplicationPython
from unit.option import option
class TestRespawn(TestApplicationPython):
prerequisites = {'modules': {'python': 'any'}}
PATTERN_ROUTER = 'unit: router'
PATTERN_CONTROLLER = 'unit: controller'
def setup_method(self):
self.app_name = f'app-{option.temp_dir.split("/")[-1]}'
self.load('empty', self.app_name)
assert 'success' in self.conf(
'1', f'applications/{self.app_name}/processes'
)
def pid_by_name(self, name, ppid):
output = subprocess.check_output(['ps', 'ax', '-O', 'ppid']).decode()
m = re.search(fr'\s*(\d+)\s*{ppid}.*{name}', output)
return None if m is None else m.group(1)
def kill_pids(self, *pids):
subprocess.call(['kill', '-9', *pids])
def wait_for_process(self, process, unit_pid):
for _ in range(50):
found = self.pid_by_name(process, unit_pid)
if found is not None:
break
time.sleep(0.1)
return found
def find_proc(self, name, ppid, ps_output):
return re.findall(fr'{ppid}.*{name}', ps_output)
def smoke_test(self, unit_pid):
for _ in range(10):
r = self.conf('1', f'applications/{self.app_name}/processes')
if 'success' in r:
break
time.sleep(0.1)
assert 'success' in r
assert self.get()['status'] == 200
# Check if the only one router, controller,
# and application processes running.
out = subprocess.check_output(['ps', 'ax', '-O', 'ppid']).decode()
assert len(self.find_proc(self.PATTERN_ROUTER, unit_pid, out)) == 1
assert len(self.find_proc(self.PATTERN_CONTROLLER, unit_pid, out)) == 1
assert len(self.find_proc(self.app_name, unit_pid, out)) == 1
def test_respawn_router(self, skip_alert, unit_pid, skip_fds_check):
skip_fds_check(router=True)
pid = self.pid_by_name(self.PATTERN_ROUTER, unit_pid)
self.kill_pids(pid)
skip_alert(fr'process {pid} exited on signal 9')
assert self.wait_for_process(self.PATTERN_ROUTER, unit_pid) is not None
self.smoke_test(unit_pid)
def test_respawn_controller(self, skip_alert, unit_pid, skip_fds_check):
skip_fds_check(controller=True)
pid = self.pid_by_name(self.PATTERN_CONTROLLER, unit_pid)
self.kill_pids(pid)
skip_alert(fr'process {pid} exited on signal 9')
assert (
self.wait_for_process(self.PATTERN_CONTROLLER, unit_pid) is not None
)
assert self.get()['status'] == 200
self.smoke_test(unit_pid)
def test_respawn_application(self, skip_alert, unit_pid):
pid = self.pid_by_name(self.app_name, unit_pid)
self.kill_pids(pid)
skip_alert(fr'process {pid} exited on signal 9')
assert self.wait_for_process(self.app_name, unit_pid) is not None
self.smoke_test(unit_pid)
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