Add clap parser to main command

src/main.rs

@@ -2,7 +2,8 @@ use std::{collections::HashMap, convert::Infallible, sync::Arc, time::{SystemTim
 
 use bluer::{self, Adapter, AdapterEvent, Address, DiscoveryFilter, DiscoveryTransport};
 
-use anyhow::Result;
+use anyhow::{Result, anyhow};
+use clap::Parser;
 use futures::{Stream, StreamExt};
 use tokio;
 use warp::Filter;
@@ -70,15 +71,34 @@ impl DataStore {
 
 }
 
+#[derive(Debug,clap::Parser)]
+struct CLI {
+    /// Address to bind
+    #[arg(short, long, default_value = "127.0.0.1:9174")]
+    bind: String,
+
+    /// BLE HCI adapter to use
+    #[arg(short, long)]
+    interface: Option<String>,
+
+}
+
 #[tokio::main(flavor="current_thread")]
 async fn main() -> Result<()> {
 
+    let args = CLI::parse();
+
     let session = bluer::Session::new().await?;
-    let adapter = Arc::new(session.default_adapter().await?);
+    let adapter = match &args.interface {
+        Some(hci) => session.adapter(&*hci),
+        None => session.default_adapter().await,
+    }?;
+
+    let adapter = Arc::new(adapter);
     let store = Arc::new(Mutex::new(DataStore::default()));
 
     let mut stream = Box::pin(sensor_reports(adapter).await?);
-    
+
     let sniffer_store = Arc::clone(&store);
     tokio::spawn(async move {
         while let Some(data) = stream.next().await {
@@ -93,7 +113,10 @@ async fn main() -> Result<()> {
                     .and_then(|store: Arc<Mutex<DataStore>>| async move { Ok::<_,Infallible>(store.lock().await.scrape()) })
              .or(warp::path!().map(|| { warp::reply::html("<h1>Sensirion BLE exporter</h1>") }));
 
-    Ok(warp::serve(filter).run(([127,0,0,1],9177)).await)
+    let host = tokio::net::lookup_host(&args.bind).await?
+        .next()
+        .ok_or(anyhow!("Cannot resolve host to bind {}", &args.bind))?;
+    Ok(warp::serve(filter).run(host).await)
 
 }