Update CLI help, types and documentation

README.rst

@@ -67,31 +67,26 @@ Usage
 
 ::
 
-    Usage: kea-exporter [OPTIONS] [SOCKETS]...
-
-    Options:
-    -m, --mode [socket|http]  Select mode.
-    -a, --address TEXT        Specify the address to bind against.
-    -p, --port INTEGER        Specify the port on which to listen.
-    -i, --interval INTEGER    Minimal interval between two queries to Kea in seconds.
-    -t, --target TEXT         Target address and port of Kea server, e.g.
-                               http://kea.example.com:8080.
-    --client-cert TEXT        Client certificate file path used in HTTP mode
-                               with mTLS
-    --client-key TEXT         Client key file path used in HTTP mode with mTLS
-    --version                 Show the version and exit.
-    --help                    Show this message and exit.
-
+	Usage: python -m kea_exporter [OPTIONS] TARGETS...
+
+	Options:
+	  -a, --address TEXT      Address that the exporter binds to.
+	  -p, --port INTEGER      Port that the exporter binds to.
+	  -i, --interval INTEGER  Minimal interval between two queries to Kea in
+	                          seconds.
+	  --client-cert PATH      Path to client certificate used to in HTTP requests
+	  --client-key PATH       Path to client key used in HTTP requests
+	  --version               Show the version and exit.
+	  --help                  Show this message and exit.
 
 You can also configure the exporter using environment variables:
 
 ::
 
-   export MODE="http"
    export ADDRESS="0.0.0.0"
    export PORT="9547"
    export INTERVAL="7.5"
-   export TARGET="http://kea"
+   export TARGETS="http://router.example.com:8000"
    export CLIENT_CERT="/etc/kea-exporter/client.crt"
    export CLIENT_KEY="/etc/kea-exporter/client.key"
 

kea_exporter/cli.py

@@ -26,16 +26,17 @@ def time_elapsed(self):
     "-a",
     "--address",
     envvar="ADDRESS",
+    type=str,
     default="0.0.0.0",
-    help="Specify the address to bind against.",
+    help="Address that the exporter binds to.",
 )
 @click.option(
     "-p",
     "--port",
     envvar="PORT",
     type=int,
     default=9547,
-    help="Specify the port on which to listen.",
+    help="Port that the exporter binds to.",
 )
 @click.option(
     "-i",
@@ -48,15 +49,15 @@ def time_elapsed(self):
 @click.option(
     "--client-cert",
     envvar="CLIENT_CERT",
-    type=str,
-    help="Client certificate file path used in HTTP mode with mTLS",
+    type=click.Path(exists=True),
+    help="Path to client certificate used to in HTTP requests",
     required=False,
 )
 @click.option(
     "--client-key",
     envvar="CLIENT_KEY",
-    type=str,
-    help="Client key file path used in HTTP mode with mTLS",
+    type=click.Path(exists=True),
+    help="Path to client key used in HTTP requests",
     required=False,
 )
 @click.argument("targets", envvar="TARGETS", nargs=-1, required=True)