From cc618ed79c2031ac30e17b023bceed7c0d83cf84 Mon Sep 17 00:00:00 2001
From: Serguey Parkhomovsky <xindigo@gmail.com>
Date: Sat, 21 Mar 2026 13:34:32 -0700
Subject: Make individual locks on each printer state

---
 src/main.rs | 41 ++++++++++++++++++++++++-----------------
 1 file changed, 24 insertions(+), 17 deletions(-)

(limited to 'src')

diff --git a/src/main.rs b/src/main.rs
index ddb1ed6..b6d8006 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,7 +11,8 @@ use std::sync::{Arc, RwLock};
 use std::time::Duration;
 use tracing::{debug, error, info, warn};
 
-type StateMap = Arc<RwLock<HashMap<String, PrinterState>>>;
+type PrinterStateRef = Arc<RwLock<PrinterState>>;
+type StateMap = HashMap<String, PrinterStateRef>;
 
 #[derive(Parser, Debug)]
 #[command(about = "Print statistics scraper")]
@@ -38,9 +39,8 @@ async fn main() {
         error!(path = %args.config, error = %e, "Failed to parse config file");
         process::exit(1);
     });
-    let state: StateMap = Arc::new(RwLock::new(HashMap::new()));
+    let mut map: StateMap = HashMap::new();
     for printer in config.printers {
-        let state = state.clone();
         match printer {
             Printer::Prusa {
                 name,
@@ -48,9 +48,11 @@ async fn main() {
                 api_key,
             } => {
                 info!(name, host, "Found Prusa");
-                state.write().unwrap().insert(name.clone(), PrinterState::default());
+                let printer_state = Arc::new(RwLock::new(PrinterState::default()));
+                map.insert(name.clone(), printer_state.clone());
                 tokio::spawn(async move {
-                    match tokio::spawn(poll_prusa(name.clone(), host, api_key, state)).await {
+                    match tokio::spawn(poll_prusa(name.clone(), host, api_key, printer_state)).await
+                    {
                         Ok(()) => warn!(name, "Prusa polling task exited unexpectedly"),
                         Err(e) => error!(name, error = ?e, "Prusa polling task panicked"),
                     }
@@ -63,14 +65,15 @@ async fn main() {
                 access_code,
             } => {
                 info!(name, host, "Found Bambu");
-                state.write().unwrap().insert(name.clone(), PrinterState::default());
+                let printer_state = Arc::new(RwLock::new(PrinterState::default()));
+                map.insert(name.clone(), printer_state.clone());
                 tokio::spawn(async move {
                     match tokio::spawn(poll_bambu(
                         name.clone(),
                         host,
                         serial_number,
                         access_code,
-                        state,
+                        printer_state,
                     ))
                     .await
                     {
@@ -81,6 +84,8 @@ async fn main() {
             }
         }
     }
+    // Drop mutability on the StateMap
+    let state: StateMap = map;
 
     let app = Router::new().route("/", get(root)).with_state(state);
 
@@ -99,10 +104,9 @@ async fn main() {
 
 async fn fetch_prusa(
     client: &Client,
-    name: &str,
     host: &str,
     api_key: &str,
-    state: &StateMap,
+    state: &PrinterStateRef,
 ) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
     let response = client
         .get(format!("http://{}/api/v1/status", host))
@@ -111,12 +115,11 @@ async fn fetch_prusa(
         .await?
         .json::<PrusaStatus>()
         .await?;
-    let mut lock = state.write().unwrap();
-    lock.get_mut(name).unwrap().update_from(&response);
+    state.write().unwrap().update_from(&response);
     Ok(())
 }
 
-async fn poll_prusa(name: String, host: String, api_key: String, state: StateMap) {
+async fn poll_prusa(name: String, host: String, api_key: String, state: PrinterStateRef) {
     let client = Client::builder()
         .timeout(Duration::from_secs(10))
         .build()
@@ -125,7 +128,7 @@ async fn poll_prusa(name: String, host: String, api_key: String, state: StateMap
             process::exit(1);
         });
     loop {
-        if let Err(e) = fetch_prusa(&client, &name, &host, &api_key, &state).await {
+        if let Err(e) = fetch_prusa(&client, &host, &api_key, &state).await {
             error!(name, error = %e, "Error polling Prusa printer");
         }
         tokio::time::sleep(Duration::from_secs(5)).await;
@@ -137,7 +140,7 @@ async fn poll_bambu(
     host: String,
     serial_number: String,
     access_code: String,
-    state: StateMap,
+    state: PrinterStateRef,
 ) {
     let mut mqttoptions = MqttOptions::new(&name, &host, 8883);
     mqttoptions.set_keep_alive(Duration::from_secs(5));
@@ -193,8 +196,7 @@ async fn poll_bambu(
                 debug!(payload = ?p.payload, "Received Bambu payload");
                 match serde_json::from_slice::<BambuStatus>(&p.payload) {
                     Ok(msg) => {
-                        let mut lock = state.write().unwrap();
-                        lock.get_mut(name.as_str()).unwrap().update_from(&msg);
+                        state.write().unwrap().update_from(&msg);
                         debug!(name, "Updated state");
                     }
                     Err(e) => error!(error = %e, "Failed to deserialize BambuStatus"),
@@ -210,5 +212,10 @@ async fn poll_bambu(
 }
 
 async fn root(State(state): State<StateMap>) -> Json<HashMap<String, PrinterState>> {
-    Json(state.read().unwrap().clone())
+    Json(
+        state
+            .iter()
+            .map(|(k, v)| (k.clone(), v.read().unwrap().clone()))
+            .collect(),
+    )
 }
-- 
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