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# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
import cProfile
import logging
import multiprocessing
import os
import pstats
import signal
import sys
import threading
import time
import traceback
from sqlalchemy.exc import (
NoReferenceError,
NoSuchColumnError,
NoSuchTableError,
SQLAlchemyError,
)
from lvestats.core.plugin import LveStatsPluginTerminated
from lvestats.core.plugin_context import PluginContext
from lvestats.lib.config import ConfigError
__author__ = 'shaman'
class PluginExecutionException(Exception):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
class DbRecoveredException(Exception):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
class DbRecoverFailedException(Exception):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
class PluginTimeoutException(Exception):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
class PluginExecutor(object):
initial_lve_data = {'stats': {}}
def __init__(self, config):
self.config = config
self.log = logging.getLogger('main_loop.plugin_executor')
from lvestats.lib.commons.func import ( # pylint: disable=import-outside-toplevel
get_lve_version,
)
PluginExecutor.initial_lve_data = {'stats': {}, 'LVE_VERSION': get_lve_version()}
def execute(self, plugin_class, now, timeout):
"""
Executes given plugin with provided lve_data.
Does not modify lve_data.
Returns updated lve_data or throws PluginExecutionException or PluginTimeoutException
:param plugin_class: object:
:return:
"""
raise NotImplementedError()
def terminate(self):
raise NotImplementedError()
KILL_PROCESS_TIMEOUT = 20
class SameProcessPluginExecutor(PluginExecutor):
def __init__(self, config):
super().__init__(config)
self.plugin_context = PluginContext(config)
self.last_execution_time = {}
self.lve_data = PluginExecutor.initial_lve_data.copy()
def execute(self, plugin_class, now, timeout):
log = logging.getLogger('main_loop.plugin_executor.same_process')
plugin_instance = self.plugin_context.get_instance(plugin_class)
plugin_instance.now = now
time_passed = None
period = getattr(plugin_instance, 'period', getattr(plugin_class, 'period', None))
if period:
time_passed = now - self.last_execution_time.get(plugin_class, 0)
if period is None or period <= time_passed:
try:
plugin_instance.execute(self.lve_data)
self.last_execution_time[plugin_class] = now
return
except (NoSuchColumnError, NoSuchTableError, NoReferenceError) as ex:
log.exception('Database error during executing plugin that leads to need of db recreation db')
try:
self.plugin_context.recover_db()
except BaseException as exception_during_recover:
raise DbRecoverFailedException(exception_during_recover) from exception_during_recover
raise DbRecoveredException() from ex
except SQLAlchemyError as ex:
log.exception('Database error during executing plugin that may indicate the need to recreate db. '
'Please check it manually.')
raise PluginExecutionException(ex) from ex
except BaseException as ex:
raise PluginExecutionException(ex) from ex
def terminate(self):
pass
class ProcessContext(object):
def __init__(self):
self.mgr = multiprocessing.Manager()
self.ns = self.mgr.Namespace()
self.ns.last_execution_time = {}
self.plugin_ready_event = self.mgr.Event()
self.plugin_execution_finished_event = self.mgr.Event()
self.plugin_execution_success_event = self.mgr.Event()
self.db_error_event = self.mgr.Event()
self.have_to_exit = self.mgr.Event()
self.exited = self.mgr.Event()
def terminate(self):
self.mgr.shutdown()
class SeparateProcessPluginExecutor(PluginExecutor):
def __init__(self, config, profiling_log=None):
super().__init__(config)
self.profiling_log = profiling_log
self.process_context = None
self.process = None
@staticmethod
def _in_separate_process(config, process_context, profiler=None, profiling_log=None):
os.setpgrp()
signal.signal(signal.SIGTERM, SeparateProcessPluginExecutor._child_process_sigterm_handler)
signal.signal(signal.SIGUSR1, SeparateProcessPluginExecutor._sigusr1_handler)
log = logging.getLogger('main_loop.plugin_executor.process')
try:
plugin_context = PluginContext(config)
lve_data = PluginExecutor.initial_lve_data.copy()
while True:
while not process_context.plugin_ready_event.wait(timeout=1):
if process_context.have_to_exit.is_set():
process_context.plugin_execution_finished_event.set()
if profiler:
with open(profiling_log, 'a+', encoding='utf-8') as f:
f.write('Plugin process profile, internal time:\n')
stats = pstats.Stats(profiler, stream=f)
stats.sort_stats('time').print_stats(20)
f.write('Plugin process profile, cumulative time:\n')
stats.sort_stats('cumulative').print_stats(20)
process_context.exited.set()
return
process_context.plugin_ready_event.clear()
plugin_class = process_context.ns.plugin_class
now = process_context.ns.now
try:
plugin_instance = plugin_context.get_instance(plugin_class)
except ConfigError as ce:
log.exception(str(ce))
continue
except Exception as ex:
log.exception("Error during instantiating plugin")
process_context.ns.exception = ex
process_context.plugin_execution_finished_event.set()
continue
plugin_instance.now = now
period = getattr(plugin_instance, 'period', getattr(plugin_class, 'period', None))
if period is not None:
period = float(period)
time_passed = None
last_execution_time = process_context.ns.last_execution_time
if period is not None:
time_passed = now - last_execution_time.get(plugin_class, 0)
if period is None or period <= time_passed:
try:
signal.signal(signal.SIGUSR2, SeparateProcessPluginExecutor._stop_plugin)
log.debug("Executing plugin %s", plugin_class)
t0 = time.time()
plugin_instance.execute(lve_data)
log.debug("Executing plugin %s took %f sec", plugin_class, time.time() - t0)
last_execution_time[plugin_class] = now
process_context.ns.last_execution_time = last_execution_time
process_context.plugin_execution_success_event.set()
process_context.plugin_execution_finished_event.set()
signal.signal(signal.SIGUSR2, signal.SIG_IGN)
except (NoSuchColumnError, NoSuchTableError, NoReferenceError) as ex:
log.exception('Database error during executing plugin that leads to need of db recreation db')
process_context.ns.exception = ex
process_context.db_error_event.set()
process_context.plugin_execution_finished_event.set()
continue
except SQLAlchemyError as ex:
log.exception('Database error during executing %s plugin that may indicate the need to '
'recreate db. '
'Please check it manually.', plugin_class)
process_context.ns.exception = ex
process_context.plugin_execution_finished_event.set()
continue
except LveStatsPluginTerminated:
log.info("Plugin %s was terminated.", plugin_class)
sys.exit(0)
except IOError as ioe:
log.exception("IO Error: %s", str(ioe))
continue
except Exception as ex:
log.exception("Other exception during execution of plugin %s", plugin_class)
process_context.ns.exception = ex
process_context.plugin_execution_finished_event.set()
continue
else:
log.debug("plugin %s will be launched in %f sec", plugin_class, period - time_passed)
process_context.plugin_execution_success_event.set()
process_context.plugin_execution_finished_event.set()
except Exception as ex:
try:
process_context.ns.exception = ex
except IOError as e:
# Hide "IOError: [Errno 32] Broken pipe" on KeyboardInterrupt
# Probably there is a better way to do this
if e.errno == 32 and isinstance(ex, EOFError):
return
raise e # don't hide any other error
log.exception("Exception during execution in separate process")
process_context.plugin_execution_finished_event.set()
@staticmethod
def _do_profile_in_separate_process(config, process_context, profiling_log):
profiler = cProfile.Profile()
profiler.runcall(SeparateProcessPluginExecutor._in_separate_process,
config,
process_context,
profiler,
profiling_log)
def _make_sub_process(self, ):
self.process_context = ProcessContext()
target = SeparateProcessPluginExecutor._do_profile_in_separate_process if self.profiling_log else \
SeparateProcessPluginExecutor._in_separate_process
self.process = multiprocessing.Process(target=target,
name='plugin_process',
args=(self.config, self.process_context, self.profiling_log))
self.process.start()
@staticmethod
def _stop_plugin(signum, frame):
log = logging.getLogger('plugin_sigusr2_handler')
log.info('Shutting down plugin')
raise LveStatsPluginTerminated()
@staticmethod
def _child_process_sigterm_handler(signum, frame):
log = logging.getLogger('subprocess_sigterm_handler')
log.info('Shutting down child process')
sys.exit(0)
def _kill_subprocess(self, pid):
if not pid:
return
os.kill(pid, signal.SIGKILL)
self.log.debug("subprocess killed")
def _terminate_sub_process(self):
if not self.process or not self.process_context:
return
self.log.debug('Terminating subprocess')
self.process_context.have_to_exit.set()
if self.process_context.exited.wait(KILL_PROCESS_TIMEOUT):
self.process = None
self.process_context.terminate()
self.process_context = None
return
self.log.debug('Killing subprocess')
pid = self.process.pid
try:
self.process.terminate()
self.process.join(KILL_PROCESS_TIMEOUT)
if self.process.is_alive():
self._kill_subprocess(pid)
except Exception as ex:
self.log.exception("Wasn't able to kill subprocess because of the error: %s", str(ex))
self._kill_subprocess(pid)
finally:
self.process = None
self.process_context.terminate()
self.process_context = None
@staticmethod
def _sigusr1_handler(signum, frame):
log = logging.getLogger('stack tracer')
log.info("--- Threads stack traces, while plugin is considered stuck ---")
id2name = dict([(th.ident, th.name) for th in threading.enumerate()])
code = []
for thread_id, stack in list(sys._current_frames().items()): # pylint: disable=protected-access
code.append(f"\n# Thread: {id2name.get(thread_id, '')}({thread_id})")
for filename, lineno, name, line in traceback.extract_stack(stack):
code.append(f'File: "{filename}", line {lineno}, in {name}')
if line:
code.append(f" {line.strip()}")
log.info("\n".join(code))
def terminate(self):
self._terminate_sub_process()
def _restart_sub_process(self):
self._terminate_sub_process()
self._make_sub_process()
def _get_process_and_context(self):
if not self.process or not self.process_context:
self._make_sub_process()
return self.process, self.process_context
def execute(self, plugin_class, now, timeout):
if self.profiling_log:
timeout = None
_, context = self._get_process_and_context()
t0 = time.time()
context.ns.plugin_class = plugin_class
context.ns.now = now
context.plugin_execution_finished_event.clear()
context.plugin_execution_success_event.clear()
context.plugin_ready_event.set()
self.log.debug('Executor (main process) data exchange with plugin took %f sec', time.time() - t0)
context.plugin_execution_finished_event.wait(timeout)
db_corrupted = context.db_error_event.is_set()
if db_corrupted:
self._terminate_sub_process()
try:
recreator = PluginContext(self.config)
recreator.recover_db()
except BaseException as exception_during_recover:
raise DbRecoverFailedException(exception_during_recover) from exception_during_recover
self._make_sub_process()
raise DbRecoveredException()
in_time = context.plugin_execution_finished_event.is_set()
if not in_time:
os.kill(self.process.pid, signal.SIGUSR1)
time.sleep(timeout / 2.0)
self._restart_sub_process()
raise PluginTimeoutException()
success = context.plugin_execution_success_event.is_set()
if not success:
ex = context.ns.exception
self._terminate_sub_process()
if ex:
raise PluginExecutionException(ex)
else:
raise PluginExecutionException()
__all__ = ['PluginExecutor', 'SameProcessPluginExecutor', 'SeparateProcessPluginExecutor',
'PluginExecutionException', 'PluginTimeoutException', 'DbRecoveredException',
'DbRecoverFailedException']
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