tests/charms/layers/simple/reactive/simple.py

# Copyright 2019 Canonical Ltd.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
#     Unless required by applicable law or agreed to in writing, software
#     distributed under the License is distributed on an "AS IS" BASIS,
#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#     See the License for the specific language governing permissions and
#     limitations under the License.

from charmhelpers.core.hookenv import (
    action_get,
    action_fail,
    action_set,
    status_set,
)
from charms.reactive import (
    clear_flag,
    set_flag,
    when,
    when_not,
)
import charms.sshproxy
import os


@when('sshproxy.configured')
@when_not('simple.installed')
def install_simple_proxy_charm():
    """Post-install actions.

    This function will run when two conditions are met:
    1. The 'sshproxy.configured' state is set
    2. The 'simple.installed' state is not set

    This ensures that the workload status is set to active only when the SSH
    proxy is properly configured.
    """
    set_flag('simple.installed')
    status_set('active', 'Ready!')


@when('actions.touch')
def touch():
    if not in_action_context():
        clear_flag('actions.touch')
        return

    err = ''
    try:
        filename = action_get('filename')
        cmd = ['touch {}'.format(filename)]
        result, err = charms.sshproxy._run(cmd)
    except Exception:
        action_fail('command failed:' + err)
    else:
        action_set({'output': result})
    finally:
        clear_flag('actions.touch')


def in_action_context():
    """Determine whether we're running on an action context."""
    return 'JUJU_ACTION_UUID' in os.environ