Added Google Assistant draft backend

platypush/backend/assistant/google/__init__.py

@@ -0,0 +1,58 @@
+import logging
+import json
+import os
+import time
+
+import google.oauth2.credentials
+
+from google.assistant.library import Assistant
+from google.assistant.library.event import EventType
+from google.assistant.library.file_helpers import existing_file
+
+from .. import Backend
+
+class AssistantGoogleBackend(Backend):
+    """ Class for the Google Assistant backend. It creates and event source
+        that posts recognized phrases on the main bus """
+
+    def __init__(self, credentials_file=os.path.join(
+            os.path.expanduser('~/.config'),
+            'google-oauthlib-tool', 'credentials.json') , **kwargs):
+        """ Params:
+            credentials_file -- Path to the Google OAuth credentials file
+                (default: ~/.config/google-oauthlib-tool/credentials.json) """
+
+        super().__init__(**kwargs)
+        self.credentials_file = credentials_file
+
+        with open(args.credentials, 'r') as f:
+            self.credentials = google.oauth2.credentials.Credentials(token=None,
+                                                                     **json.load(f))
+
+        self.assistant = None
+
+    def _process_event(self, event):
+        logging.info('Received assistant event: {}'.format(event))
+        # self.on_message(event)
+
+    def send_message(self, msg):
+        raise NotImplementedError("Cannot send messages on an event source")
+
+    def on_stop(self):
+        if self.producer:
+            self.producer.flush()
+            self.producer.close()
+
+        if self.consumer:
+            self.consumer.close()
+
+    def run(self):
+        super().run()
+
+        with Assistant(self.credentials) as self.assistant:
+            for event in assistant.start():
+                self._process_event(event)
+
+
+# vim:sw=4:ts=4:et:
+