Rewrote code logic to deal with the case if a service gets activated during the freezer is running

This commit is contained in:
Kevin Veen-Birkenbach 2023-12-14 18:13:13 +01:00
parent 5605e0bcc3
commit 0cd0031368

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@ -2,12 +2,18 @@ import argparse
import subprocess
import time
import os
from datetime import datetime
def parse_time_to_seconds(time_str):
"""Convert time string to seconds."""
units = {"s": 1, "min": 60, "h": 3600}
number, unit = time_str[:-1], time_str[-1]
if unit not in units:
if time_str[-3:] in units:
number, unit = time_str[:-3], time_str[-3:]
elif time_str[-2:] in units:
number, unit = time_str[:-2], time_str[-2:]
elif time_str[-1:] in units:
number, unit = time_str[:-1], time_str[-1:]
else:
raise ValueError("Invalid time unit")
return int(number) * units[unit]
@ -30,78 +36,89 @@ def check_service_active(service_name):
service_status = result.stdout.decode('utf-8').strip()
return_value=service_status in ['active', 'activating']
if return_value:
print(f"Service {service} is active.");
print(f"Service {service_name} is active.");
else:
print(f"Service {service} is not active.");
print(f"Service {service_name} is not active.");
return return_value
def check_any_service_active(services):
"""Check if any service in the list is active or activating."""
for service in services:
for service_name in services:
if check_service_active(service_name):
return True
return False
def freeze(services_to_wait_for, ignored_services, timeout_sec):
def stop_timer(service):
# Stop and disable the corresponding timer, if it exists
if service_file_exists(service,"timer"):
timer_name = service + ".timer"
subprocess.run(['systemctl', 'stop', timer_name])
subprocess.run(['systemctl', 'disable', timer_name])
print(f"{timer_name} stopped and disabled.")
else:
print(f"No timer to stop.")
def filter_services(services, ignored_services):
"""
Removes all services from the 'services' list that are contained in 'ignored_services'.
:param services: List of services.
:param ignored_services: List of services to be ignored.
:return: Filtered list of services.
"""
return [service for service in services if service not in ignored_services]
def stop_all_timers(services):
for service in services:
stop_timer(service)
def wait_for_all_services_to_stop(filtered_services,max_attempts,attempt,break_time_sec):
for service in filtered_services:
while check_service_active(service):
attempt += 1
if attempt > max_attempts:
raise Exception(f"Error: Maximum attempts ({max_attempts}) reached. Exit.")
print(f"{datetime.now().isoformat()}#{attempt}/{max_attempts}: Waiting for {break_time_sec} seconds for {service} to stop...")
time.sleep(break_time_sec)
return attempt
def freeze(filtered_services,timeout_sec):
break_time_sec=5
attempt=0
max_attempts=timeout_sec/break_time_sec
any_service_active=True
print("Checking if any services is active.")
# This guaranties that no service will be started in the between time
while any_service_active:
# Filter services that exist and are not in the ignored list
for service in services_to_wait_for:
print(f"\nFreezing: {service}")
if service in ignored_services:
print(f"{service} will be ignored.")
else:
while check_service_active(service):
current_time_iso = datetime.now().isoformat()
attempt += 1
print(f"{current_time_iso}#{attempt}/{max_attempts}: Waiting for {break_time_sec} seconds for {service} to stop...")
time.sleep(break_time_sec)
if attempt > max_attempts:
raise Exception(f"Error: Maximum attempts ({max_attempts}) reached. Exit.")
# Stop and disable the corresponding timer, if it exists
if service_file_exists(service,"timer"):
timer_name = service + ".timer"
subprocess.run(['systemctl', 'stop', timer_name])
subprocess.run(['systemctl', 'disable', timer_name])
print(f"{timer_name} stopped and disabled.")
else:
print(f"No timer to stop.")
print("Checking if any of the previous deactivated services is active.")
any_service_active=check_any_service_active(services_to_wait_for)
while check_any_service_active(filtered_services):
stop_all_timers(filtered_services)
attempt=wait_for_all_services_to_stop(filtered_services,max_attempts,attempt,break_time_sec)
print("\nAll required services have stopped.")
def defrost(services_to_wait_for, ignored_services):
for service in services_to_wait_for:
def defrost(filtered_services):
for service in filtered_services:
print(f"\nUnfreezing: {service}")
if service in ignored_services:
print(f"{service} will be ignored.")
elif service_file_exists(service,"timer"):
if service_file_exists(service,"timer"):
# Start and enable the corresponding timer, if it exists
timer_name = service + ".timer"
subprocess.run(['systemctl', 'start', timer_name])
subprocess.run(['systemctl', 'enable', timer_name])
print(f"{timer_name} started and enabled.")
else:
print(f"Skipped.")
print(f"No timer to activate.")
print("\nAll required services are started.")
def main(services_to_wait_for, ignored_services, action, timeout_sec):
print(f"Services to wait for: {services_to_wait_for}")
print(f"Services to ignore: {ignored_services}")
def main(services, ignored_services, action, timeout_sec):
filtered_services=filter_services(services, ignored_services)
print(f"Services to handle : {services}")
print(f"Services to ignore : {ignored_services}")
print(f"Services filtered : {filtered_services}")
if action == 'freeze':
print("Freezing services.");
freeze(services_to_wait_for, ignored_services, timeout_sec)
freeze(filtered_services, timeout_sec)
elif action == 'defrost':
print("Unfreezing services.");
defrost(services_to_wait_for, ignored_services)
defrost(filtered_services)
print('\nOverview:')
subprocess.run(['systemctl', 'list-timers'])
@ -111,9 +128,8 @@ if __name__ == "__main__":
parser.add_argument('services', nargs='+', help='List of services to apply the action to')
parser.add_argument('--ignore', nargs='*', help='List of services to ignore in the action', default=[])
parser.add_argument('--timeout', help='Timeout for freezing services (e.g., 1h, 30min, 45s)', default='1h')
args = parser.parse_args()
services_to_wait_for = args.services
services = args.services
ignored_services = args.ignore if args.ignore else []
timeout_seconds = parse_time_to_seconds(args.timeout)
main(services_to_wait_for, ignored_services, args.action, timeout_seconds)
main(services, ignored_services, args.action, timeout_seconds)