osm_common/tests/packages/native_charm_with_metadata_dir_vnf/Scripts/charms/simple/src/charm.py

   1 #!/usr/bin/env python3
   2 ##
   3 # Copyright 2020 Canonical Ltd.
   4 # All rights reserved.
   5 #
   6 # Licensed under the Apache License, Version 2.0 (the "License"); you may
   7 # not use this file except in compliance with the License. You may obtain
   8 # a copy of the License at
   9 #
  10 #         http://www.apache.org/licenses/LICENSE-2.0
  11 #
  12 # Unless required by applicable law or agreed to in writing, software
  13 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  14 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  15 # License for the specific language governing permissions and limitations
  16 # under the License.
  17 ##
  18
  19 import sys
  20 import subprocess
  21
  22 from ops.charm import CharmBase
  23 from ops.main import main
  24 from ops.model import ActiveStatus
  25
  26 sys.path.append("lib")
  27
  28
  29 class MyNativeCharm(CharmBase):
  30
  31     def __init__(self, framework, key):
  32         super().__init__(framework, key)
  33
  34         # Listen to charm events
  35         self.framework.observe(self.on.config_changed, self.on_config_changed)
  36         self.framework.observe(self.on.install, self.on_install)
  37         self.framework.observe(self.on.start, self.on_start)
  38
  39         # Listen to the touch action event
  40         self.framework.observe(self.on.touch_action, self.on_touch_action)
  41
  42     def on_config_changed(self, event):
  43         """Handle changes in configuration"""
  44         self.model.unit.status = ActiveStatus()
  45
  46     def on_install(self, event):
  47         """Called when the charm is being installed"""
  48         self.model.unit.status = ActiveStatus()
  49
  50     def on_start(self, event):
  51         """Called when the charm is being started"""
  52         self.model.unit.status = ActiveStatus()
  53
  54     def on_touch_action(self, event):
  55         """Touch a file."""
  56
  57         filename = event.params["filename"]
  58         try:
  59             subprocess.run(["touch", filename], check=True)
  60             event.set_results({"created": True, "filename": filename})
  61         except subprocess.CalledProcessError as e:
  62             event.fail("Action failed: {}".format(e))
  63         self.model.unit.status = ActiveStatus()
  64
  65
  66 if __name__ == "__main__":
  67     main(MyNativeCharm)