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import asyncio
from inspect import isgenerator, signature
from molotov.api import get_fixture, get_scenario, next_scenario, pick_scenario
from molotov.listeners import EventSender
from molotov.session import get_context, get_session
from molotov.util import cancellable_sleep, get_timer, is_stopped, now, set_timer, stop
class FixtureError(Exception):
pass
class Worker:
""" "The Worker class creates a Session and runs scenario."""
def __init__(
self,
wid,
results,
console,
args,
statsd=None,
delay=0,
loop=None,
):
self.wid = wid
self.results = results
self.console = console
self.loop = loop or asyncio.get_event_loop()
self.args = args
self.statsd = statsd
self.delay = delay
self.count = 0
self.worker_start = 0
self.eventer = EventSender(console)
self._exhausted = False
# fixtures
self._session_setup = get_fixture("setup_session")
self._session_teardown = get_fixture("teardown_session")
self._setup = get_fixture("setup")
self._teardown = get_fixture("teardown")
self._active_sessions = {}
def print(self, line):
self.console.print(f"[W:{self.wid}] {line}")
async def send_event(self, event, **options):
await self.eventer.send_event(event, wid=self.wid, **options)
async def run(self):
self.print("Starting")
await asyncio.sleep(0)
if self.delay > 0.0:
await cancellable_sleep(self.delay)
if is_stopped():
return
self.results["WORKER"] += 1
self.results["MAX_WORKERS"] += 1
try:
res = await self._run()
finally:
self.teardown()
self.results["WORKER"] -= 1
return res
def _may_run(self):
if is_stopped():
return False
if now() - self.worker_start > self.args.duration:
return False
if self._exhausted:
return False
if self.results["REACHED"] == 1:
return False
if self.args.max_runs and self.count > self.args.max_runs:
return False
return True
async def setup(self):
if self._setup is None:
return {}
try:
options = await self._setup(self.wid, self.args)
except Exception as e:
self.console.print_error(e)
raise FixtureError(str(e)) from e
if options is None:
options = {}
elif not isinstance(options, dict):
msg = "The setup function needs to return a dict"
self.print(msg)
raise FixtureError(msg)
return options
async def session_setup(self, session):
if self._session_setup is None:
return
try:
await self._session_setup(self.wid, session)
except Exception as e:
self.console.print_error(e)
raise FixtureError(str(e)) from e
async def session_teardown(self):
for _, session in self._active_sessions.items():
if self._session_teardown is not None:
try:
await self._session_teardown(self.wid, session)
except Exception as e:
# we can't stop the teardown process
self.console.print_error(e)
try:
await session.close()
except Exception:
pass
async def _get_session(self, kind, **options):
if kind in self._active_sessions:
session = self._active_sessions[kind]
else:
self.print(f"Setting up session of kind {kind}")
# needs creation
session = get_session(
self.loop,
self.console,
self.args.verbose,
self.statsd,
kind=kind,
**options,
)
get_context(session).args = self.args
get_context(session).worker_id = self.wid
try:
await self.session_setup(session)
except FixtureError as e:
self.results["SESSION_SETUP_FAILED"] += 1
stop(why=e)
return
self._active_sessions[kind] = session
get_context(session).step = self.count
return session
async def _run(self):
if self.statsd and not self.statsd.connected:
try:
await self.statsd.connect()
await asyncio.sleep(0)
except Exception as e:
print(e)
exception = self.args.exception
if self.args.single_mode:
single = get_scenario(self.args.single_mode)
elif self.args.single_run:
single = next_scenario()
else:
single = None
self.count = 1
self.worker_start = now()
try:
options = await self.setup()
except FixtureError as e:
self.results["SETUP_FAILED"] += 1
stop(why=e)
return
self.print("Running scenarios")
while self._may_run():
if self.count % 10 == 0:
self.print(f"Ran {self.count} scenarios")
step_start = now()
result = await self.step(self.count, scenario=single, options=options)
if result == 1:
self.results["OK"] += 1
self.results["MINUTE_OK"] += 1
elif result != 0:
self.results["FAILED"] += 1
self.results["MINUTE_FAILED"] += 1
if exception:
stop(why=result)
if not is_stopped() and self._reached_tolerance(step_start):
stop()
cancellable_sleep.cancel_all()
break
self.count += 1
if self.args.delay > 0.0:
await cancellable_sleep(self.args.delay)
else:
# forces a context switch
await asyncio.sleep(0)
self.print("Done!")
await self.session_teardown()
def teardown(self):
if self._teardown is None:
return
try:
self._teardown(self.wid)
except Exception as e:
# we can't stop the teardown process
self.console.print_error(e)
def _reached_tolerance(self, current_time):
if not self.args.sizing:
return False
if current_time - get_timer() > 60:
# we need to reset the tolerance counters
set_timer(current_time)
self.results["MINUTE_OK"].value = 0
self.results["MINUTE_FAILED"].value = 0
return False
OK = self.results["MINUTE_OK"].value
FAILED = self.results["MINUTE_FAILED"].value
if OK + FAILED < 100:
# we don't have enough samples
return False
current_ratio = float(FAILED) / float(OK) * 100.0
reached = current_ratio > self.args.sizing_tolerance
if reached:
self.results["REACHED"].value = 1
self.results["RATIO"].value = int(current_ratio * 100)
return reached
async def step(self, step_id, scenario=None, options=None):
"""single scenario call.
When it returns 1, it works. -1 the script failed,
0 the test is stopping or needs to stop.
"""
if options is None:
options = {}
if scenario is None:
scenario = pick_scenario(self.wid, step_id)
elif isgenerator(scenario):
try:
scenario = next(scenario)
except StopIteration:
self._exhausted = True
return 0
func = scenario["func"]
sig = signature(func)
session_kind = sig.parameters.get("session_factory")
if session_kind is not None and session_kind.default is not None:
session_kind = session_kind.default
for name, param in sig.parameters.items():
if name == "session_factory":
continue
options[name] = param.default
else:
session_kind = "http"
try:
session = await self._get_session(session_kind, **options)
except Exception as exc:
await self.send_event("scenario_failure", scenario=scenario, exception=exc)
self.print("Session creation failure!")
self.console.print_error(exc)
return exc
try:
await self.send_event("scenario_start", scenario=scenario)
await func(session, *scenario["args"], **scenario["kw"])
await self.send_event("scenario_success", scenario=scenario)
if scenario["delay"] > 0.0:
await cancellable_sleep(scenario["delay"])
return 1
except Exception as exc:
await self.send_event("scenario_failure", scenario=scenario, exception=exc)
self.print("Failure!")
self.console.print_error(exc)
return exc
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