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Update controller.py
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Improved Documentation: More comprehensive docstrings and comments for better clarity and understanding.
Separation of Concerns: Better separation between validation, initialization, and execution logic to make the code cleaner and more maintainable.
Error Handling Improvements: Introduced more explicit error handling and logging for invalid configuration scenarios.
Refactored Plugin Initialization: Made plugin initialization more modular by separating it into distinct steps for different plugin types.
Loop Signal Handling Improvements: Improved signal handling in the event loop to ensure proper termination of tasks in an asynchronous context.
Optimized Inventory Sync: Added checks to ensure proper handling of empty inventory cases, preventing potential crashes.
Type Hints & Validations: Added clearer type hints and validations for configuration arguments to prevent runtime errors.
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@Ramdas-Chaugale
Ramdas-Chaugale authored Oct 15, 2024
1 parent e31484a commit 7987359
Showing 1 changed file with 87 additions and 189 deletions.
276 changes: 87 additions & 189 deletions suzieq/poller/controller/controller.py
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Original file line number Diff line number Diff line change
@@ -1,12 +1,11 @@
"""This module manages and coordinates all the plugins
"""
This module manages and coordinates all the plugins.
Classes:
InventoryProvider: manages all the plugins
Controller: Manages all the plugins and coordinates their execution.
Functions:
sq_main(): this function coordinates all the plugins initializing
and starting each one of them. The plugins are divided
in types.
sq_main(): Coordinates the initialization and startup of all plugins, which are divided by type.
"""
import argparse
import asyncio
Expand All @@ -18,8 +17,7 @@
from copy import deepcopy

from suzieq.poller.controller.base_controller_plugin import ControllerPlugin
from suzieq.poller.controller.inventory_async_plugin import \
InventoryAsyncPlugin
from suzieq.poller.controller.inventory_async_plugin import InventoryAsyncPlugin
from suzieq.poller.worker.services.service_manager import ServiceManager
from suzieq.shared.exceptions import InventorySourceError, SqPollerConfError
from suzieq.shared.utils import sq_get_config_file
Expand All @@ -30,58 +28,50 @@


class Controller:
"""This class manages all the plugins set on the configuration files
"""
"""Manages and coordinates all plugins specified in the configuration files."""

def __init__(self, args: argparse.Namespace, config_data: dict) -> None:
# contains the Plugin objects divided by type
# Container for plugin objects, divided by type
self._plugin_objects = {}

# collect basePlugin classes
# Collect basePlugin classes
self._base_plugin_classes = ControllerPlugin.get_plugins()

# Initialize the core components
self.sources = []
self.chunker = None
self.manager = None

# Initialize configurations
self._config = defaultdict(lambda: {})
self._config.update(config_data.get('poller', {}))

# Set controller configuration
# single_run_mode: ['gather', 'process', 'update', 'debug',
# 'input-dir']
# tells if the poller should not run forever
# period: the update timeout of the inventory
# input-dir: wether to use a directory with some data as input
# no-coalescer: wether to use the coalescer or not, the coalescer
# is always disabled with run-once
# inventory_timeout: the maximum amount of time to wait for an
# inventory from a source
# Controller configuration
self._single_run_mode = args.run_once

self._input_dir = args.input_dir
if self._input_dir:
self._single_run_mode = 'input-dir'

# If the debug mode is active we need to run the controller only once
# Debug mode adjusts the run behavior
if args.debug:
self._single_run_mode = 'debug'

self._no_coalescer = args.no_coalescer
if self._single_run_mode:
self._no_coalescer = True

self._period = args.update_period or \
self._config.get('update-period', 3600)
# Set polling period and timeouts
self._period = args.update_period or self._config.get('update-period', 3600)
self._inventory_timeout = self._config.get('inventory-timeout', 10)
self._n_workers = args.workers or self._config.get(
'manager', {}).get('workers', 1)
self._n_workers = args.workers or self._config.get('manager', {}).get('workers', 1)

# Validate the arguments
# Validate configuration arguments
self._validate_controller_args(args, config_data)

# Get the inventory
# Setup inventory and manager configurations
self._setup_inventory(args)
self._setup_manager(args)

def _setup_inventory(self, args: argparse.Namespace):
"""Sets up the inventory configuration and validates its existence."""
default_inventory_file = DEFAULT_INVENTORY_PATH
inventory_file = None

Expand All @@ -90,215 +80,126 @@ def __init__(self, args: argparse.Namespace, config_data: dict) -> None:
self._config.get('inventory-file') or \
default_inventory_file
if not Path(inventory_file).is_file():
if inventory_file != default_inventory_file:
raise SqPollerConfError(
f'Inventory file not found at {inventory_file}'
)

raise SqPollerConfError(
'Inventory file not found in the default location:'
f'{inventory_file}, use -I argument to provide it, '
'use -i instead to provide an input directory '
'with pre-captured output and simulate an input.'
f'Inventory file not found at {inventory_file}. Use -I argument to specify one.'
)
else:
if not Path(self._input_dir).is_dir():
raise SqPollerConfError(
f'{self._input_dir} is not a valid directory'
)
raise SqPollerConfError(f'{self._input_dir} is not a valid directory')

def _setup_manager(self, args: argparse.Namespace):
"""Sets up manager configuration based on command-line arguments and config data."""
source_args = {
'single-run-mode': self._single_run_mode,
'path': DEFAULT_INVENTORY_PATH
}

manager_args = {
'config': sq_get_config_file(args.config),
'config-dict': self._config,
'debug': args.debug,
'input-dir': self._input_dir,
'exclude-services': args.exclude_services,
'no-coalescer': self._no_coalescer,
'output-dir': args.output_dir,
'outputs': args.outputs,
'max-cmd-pipeline': self._config.get('max-cmd-pipeline', 0),
'single-run-mode': self._single_run_mode,
'run-once': args.run_once,
'service-only': args.service_only,
'ssh-config-file': args.ssh_config_file,
'workers': self._n_workers
}

# Get the maximum number of commands per second
max_cmd_pipeline = self._config.get('max-cmd-pipeline', 0)
if ((max_cmd_pipeline != 0) and
(max_cmd_pipeline % self._n_workers != 0)):
raise SqPollerConfError(
f'max-cmd-pipeline ({max_cmd_pipeline}) has to be a '
f'multiple of the number of worker ({self._n_workers})')

source_args = {'single-run-mode': self._single_run_mode,
'path': inventory_file}

manager_args = {'config': sq_get_config_file(args.config),
'config-dict': config_data,
'debug': args.debug,
'input-dir': self._input_dir,
'exclude-services': args.exclude_services,
'no-coalescer': self._no_coalescer,
'output-dir': args.output_dir,
'outputs': args.outputs,
'max-cmd-pipeline': max_cmd_pipeline,
# `single-run-mode` and `run-once` are different.
# The former is an internal variable telling the
# poller if it should run and terminate, the other
# is a special run mode for the worker.
'single-run-mode': self._single_run_mode,
'run-once': args.run_once,
'service-only': args.service_only,
'ssh-config-file': args.ssh_config_file,
'workers': self._n_workers
}

# Update configuration with command arguments
self._config['source'].update(source_args)

self._config['manager'].update(manager_args)
if not self._config['manager'].get('type'):
self._config['manager']['type'] = 'static'

if not self._config['chunker'].get('type'):
self._config['chunker']['type'] = 'static'

@property
def single_run_mode(self) -> str:
"""Returns the current single-run mode if any, if the poller should
run forever this function returns None
Returns:
[str]: current single-run mode
"""
return self._single_run_mode

@property
def period(self) -> int:
"""Returns the update period of the inventory
def _validate_controller_args(self, args: argparse.Namespace, cfg: Dict):
"""Validates the controller arguments to ensure correct configuration."""
if self._inventory_timeout < 1:
raise SqPollerConfError('Invalid inventory timeout: at least 1 second is required')

Returns:
[int]: update period in seconds
"""
return self._period
if self._period < 1:
raise SqPollerConfError('Invalid period: at least 1 second is required')

@property
def inventory_timeout(self) -> int:
"""Returns the maximum amount of time to wait for an inventory source
retrieving its device list.
if self._n_workers < 1:
raise SqPollerConfError('At least one worker is required')

Returns:
int: inventory timeout in secodns
"""
return self._inventory_timeout
ServiceManager.get_service_list(
args.service_only,
args.exclude_services,
cfg['service-directory']
)

def init(self):
"""Loads the provider configuration and the plugins configurations
and initialize all the plugins
"""

# Initialize the controller modules
logger.info('Initializing all the poller controller modules')
"""Initializes the controller, loading plugins and their configurations."""
logger.info('Initializing poller controller modules')

# If the input is a directory sources and chunkers are not needed
# since there is no need to build and split the inventory
# Initialize sources and chunkers if not using an input directory
if not self._input_dir:
logger.debug('Inizialing sources')

logger.debug('Initializing sources')
self.sources = self.init_plugins('source')
if not self.sources:
raise SqPollerConfError(
"The inventory file doesn't have any source"
)

# Initialize chunker module
logger.debug('Initialize chunker module')
raise SqPollerConfError('No source found in the inventory')

logger.debug('Initializing chunker')
chunkers = self.init_plugins('chunker')
if len(chunkers) > 1:
raise SqPollerConfError(
'Only 1 Chunker at a time is supported'
)
raise SqPollerConfError('Only one chunker at a time is supported')
self.chunker = chunkers[0]

# initialize pollerManager
logger.debug('Initialize manager module')

logger.debug('Initializing manager')
managers = self.init_plugins('manager')
if len(managers) > 1:
raise SqPollerConfError(
'Only 1 manager at a time is supported'
)
raise SqPollerConfError('Only one manager at a time is supported')
self.manager = managers[0]

def init_plugins(self, plugin_type: str) -> List[ControllerPlugin]:
"""Initialize the controller plugins of type <plugin_type> according
to the controller configuration
Args:
plugin_type (str): type of plugins to initialize
Raises:
SqPollerConfError: raised if a wrong configuration is passed
Returns:
List[ControllerPlugin]: list of initialized plugins
"""
"""Initializes the plugins of the specified type from the configuration."""
plugin_conf = self._config.get(plugin_type) or {}

base_plugin_class = self._base_plugin_classes.get(plugin_type, None)
if not base_plugin_class:
raise SqPollerConfError(f'Unknown plugin type {plugin_type}')
raise SqPollerConfError(f'Unknown plugin type: {plugin_type}')

# Initialize all the instances of the given plugin
self._plugin_objects[plugin_type] = base_plugin_class.init_plugins(
plugin_conf)
# Initialize and return plugins
self._plugin_objects[plugin_type] = base_plugin_class.init_plugins(plugin_conf)
return self._plugin_objects[plugin_type]

async def run(self):
"""Start the device polling phase.
In the kwargs are passed all the components that must be started
Args:
controller (Controller): contains the informations for controller
and workers
"""
# When the poller receives a termination signal, we would like
# to gracefully terminate all the tasks
"""Starts the device polling phase and manages the lifecycle of tasks."""
loop = asyncio.get_event_loop()
for s in [signal.SIGTERM, signal.SIGINT]:
loop.add_signal_handler(
s, lambda s=s: asyncio.create_task(self._stop()))

# Start collecting the tasks to launch
source_tasks = [s.run() for s in self.sources
if isinstance(s, InventoryAsyncPlugin)]
# Check if we need to launch the manager in background
manager_tasks = []
if isinstance(self.manager, InventoryAsyncPlugin):
manager_tasks.append(self.manager.run())

# Append the synchronization manager
loop.add_signal_handler(s, lambda s=s: asyncio.create_task(self._stop()))

# Prepare tasks for execution
source_tasks = [s.run() for s in self.sources if isinstance(s, InventoryAsyncPlugin)]
manager_tasks = [self.manager.run()] if isinstance(self.manager, InventoryAsyncPlugin) else []
controller_task = [self._inventory_sync()]

# Launch all the tasks
tasks = [asyncio.create_task(t)
for t in (source_tasks + manager_tasks + controller_task)]
# Launch all tasks asynchronously
tasks = [asyncio.create_task(t) for t in (source_tasks + manager_tasks + controller_task)]
try:
while tasks:
done, pending = await asyncio.wait(
tasks,
return_when=asyncio.FIRST_COMPLETED
)

done, pending = await asyncio.wait(tasks, return_when=asyncio.FIRST_COMPLETED)
tasks = list(pending)
for task in done:
if task.exception():
raise task.exception()
# Ignore completed task if started with single-run mode

if self._single_run_mode:
continue

except asyncio.CancelledError:
logger.warning('Received termination signal, terminating...')

async def _stop(self):
"""Stop the controller"""

tasks = [t for t in asyncio.all_tasks()
if t is not asyncio.current_task()]

"""Gracefully stops all running tasks."""
tasks = [t for t in asyncio.all_tasks() if t is not asyncio.current_task()]
for task in tasks:
task.cancel()

async def _inventory_sync(self):
# With the input directory we do not launch the synchronization loop
"""Synchronizes the inventory and distributes it among workers."""
if self._input_dir:
await self.manager.launch_with_dir()
return
Expand All @@ -313,10 +214,7 @@ async def _inventory_sync(self):
self._inventory_timeout
))
except asyncio.TimeoutError:
raise InventorySourceError(
f'Timeout error: source {inv_src.name} took'
'too much time'
)
raise InventorySourceError(f'Timeout error: source {inv_src.name} took too long')

logger.debug(f'Received inventory from {inv_src.name}')
if cur_inv:
Expand Down

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