Add Daemon and DaemonPlugin classes

daemon/__init__.py

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+from .daemon import Daemon
+from .daemon_plugin import DaemonPlugin

daemon/daemon.py

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+"Daemon class"
+import logging
+import requests
+
+class Daemon:
+    "Daemon "
+    def __init__(self, osd_backend, car_api, messagebus_client):
+        self.plugins = []
+        self.osd_backend = osd_backend
+        self.car_api = car_api
+        self.messagebus_client = messagebus_client
+
+    def register_plugin(self, plugin_class):
+        "Registers a plugin"
+        plugin = plugin_class(self)
+        self.plugins.append(plugin)
+
+    def get_data(self):
+        "Gets data from car api"
+        return requests.get(self.car_api)
+
+    def emit(self, event, data):
+        "Events data to OSD Backend"
+        json = {
+            "event": event,
+            "data": data
+        }
+        print(json)
+        return requests.post(self.osd_backend, json=json)
+
+    def check_all(self):
+        "Checks all the plugins"
+        data = self.get_data()
+        for plugin in self.plugins:
+            try:
+                plugin.check(data)
+            except Exception as error:  # pylint: disable=broad-except
+                logging.error("Exception raised by %s: %s", plugin, error)

daemon/daemon_plugin.py

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+"defines DaemonPlugin base class"
+from abc import ABC, abstractmethod
+from mycroft_bus_client import Message
+
+class DaemonPlugin(ABC):
+    "Abstract class for Plugins to inherit from"
+
+    def __init__(self, daemon):
+        self.daemon = daemon
+        self.messagebus_client = daemon.messagebus_client
+        self.initialize()
+
+    def initialize(self):
+        """
+        Initialize is called after the plugin object has been created. Add
+        any handlers for messagebus_client here
+        """
+
+    def emit(self, event, data):
+        "Emits a message for OSD frontend"
+        self.daemon.emit(event, data)
+
+    def speak(self, utterance):
+        "Speaks the given string"
+        message = Message("speak", {"utterance": utterance})
+        self.messagebus_client.emit(message)
+
+    @abstractmethod
+    def check(self, data):
+        "Implement the core checks here"