Add healthcheck endpoint

Author: maggie44

README.md

@@ -113,4 +113,17 @@ Fetch list of nearby Wi-Fi networks for passing to the connect endpoint.
     // links by calling the list_access_points endpoint again. Useful for 
     // enabling or disabling a refresh button on an interface.
 }
+````
+
+### http://your-device:9090/v1/healthcheck
+Check whether the API is available. Accessing this path will not record anything in the console.
+
+#### GET
+
+#### Response status 200
+Requests are returned immediately and then the process is executed. Otherwise users would be disconnected before they were able to receive the returned response. 
+````
+{
+    "message": "ok"
+}
 ````

docker-compose.yml

@@ -11,8 +11,8 @@ services:
     build:
       context: .
       dockerfile: Dockerfile.template
-    restart: always
     network_mode: "host"
+    restart: always
     labels:
       io.balena.features.dbus: '1'
     cap_add:

src/resources/system_routes.py

@@ -7,7 +7,7 @@
 
 # Function for disabling logging on '/'
 def log_request(self, *args, **kwargs):
-    if self.path == '/':
+    if self.path == '/healthcheck':
         return
 
     parent_log_request(self, *args, **kwargs)

src/run.py

@@ -58,7 +58,7 @@ def handle_sigterm(*args):
     # Configure endpoints #
 
     # Health check
-    api.add_resource(system_health_check, '/')
+    api.add_resource(system_health_check, '/healthcheck')
 
     # Wi-Fi
     api.add_resource(wifi_connect, '/v1/connect')