Example

Async Sched can run tasks on a schedule. It can also receive new tasks (in limited fashion) and change the running schedules without stopping the service.

scheduler.py
schedules/
    task1.py
    task2.py

# scheduler.py
import async_sched

srv = async_sched.start_server(('127.0.0.1', 8000),
                               update_path='./schedules',
                               global_server=True)

# srv.add('3 Second', async_sched.Schedule(seconds=3), print, 'Hello 3 seconds')

srv.run_forever()

Task 1 in the schedules directory will automatically be imported. Because start_server sets the server as an accessible attribute with get_server we can dynamically add schedules.

# schedules/task1.py
from async_sched import get_server, Schedule
import datetime


def print_task1():
    print('Hello! I am task 1 ' + str(datetime.datetime.now()))

s = Schedule(seconds=30, repeat=True)

# This will remove an existing 'Task 1' and schedule a new 'Task 1'
server = get_server()
server.add('Task 1', s, print_task1)

In the task 2 file we are not scheduling any commands, but we are registering a callback function that can be run from a client later.

# schedules/task2.py
from async_sched import get_server, Schedule
import datetime

server = get_server()


@server.register_callback  # or @server.register_callback('print_task2')
def print_task2(name):
    print('Task 2 is running! ', name, str(datetime.datetime.now()))

Now run the scheduler server to listen to remote commands and manage the running schedules.

python scheduler.py

# or python -m async_sched.server.run –path “schedules” –host “127.0.0.1” –port 8000

Use a client to print the running schedules.

python -m async_sched.client.request_schedules –host “127.0.0.1” –port 8000

Reload the files in the ./schedules/ directory.

python -m async_sched.client.update server –host “127.0.0.1” –port 8000

Stop a schedule that is running.

python -m async_sched.client.stop_schedule “Task 1” –host “127.0.0.1” –port 8000

Run a registered callback function.

python -m async_sched.client run_command “print_task2” “hello” –host “127.0.0.1” –port 8000

Schedule a registered command.

python -m async_sched.client schedule_command “print_task2” “hello” –seconds 10 –host “127.0.0.1” –port 8000