Can now reload RUST_LOG at runtime from HTTP API

crates/librqbit/src/chunk_tracker.rs

@@ -1,6 +1,6 @@
 use librqbit_core::lengths::{ChunkInfo, Lengths, ValidPieceIndex};
 use peer_binary_protocol::Piece;
-use tracing::{debug, info};
+use tracing::{debug, trace};
 
 use crate::type_aliases::BF;
 
@@ -129,7 +129,7 @@ impl ChunkTracker {
     }
 
     pub fn mark_piece_broken(&mut self, index: ValidPieceIndex) -> bool {
-        info!("remarking piece={} as broken", index);
+        debug!("remarking piece={} as broken", index);
         self.needed_pieces.set(index.get() as usize, true);
         self.chunk_status
             .get_mut(self.lengths.chunk_range(index))
@@ -170,9 +170,11 @@ impl ChunkTracker {
             return Some(ChunkMarkingResult::PreviouslyCompleted);
         }
         chunk_range.set(chunk_info.chunk_index as usize, true);
-        debug!(
+        trace!(
             "piece={}, chunk_info={:?}, bits={:?}",
-            piece.index, chunk_info, chunk_range,
+            piece.index,
+            chunk_info,
+            chunk_range,
         );
 
         if chunk_range.all() {

crates/librqbit/src/http_api.rs

@@ -14,6 +14,7 @@ use std::net::SocketAddr;
 use std::sync::atomic::Ordering;
 use std::sync::Arc;
 use std::time::{Duration, Instant};
+use tokio::sync::mpsc::UnboundedSender;
 use tracing::{info, warn};
 
 use axum::Router;
@@ -33,9 +34,9 @@ pub struct HttpApi {
 }
 
 impl HttpApi {
-    pub fn new(session: Arc<Session>) -> Self {
+    pub fn new(session: Arc<Session>, rust_log_reload_tx: Option<UnboundedSender<String>>) -> Self {
         Self {
-            inner: Arc::new(ApiInternal::new(session)),
+            inner: Arc::new(ApiInternal::new(session, rust_log_reload_tx)),
         }
     }
 
@@ -51,11 +52,14 @@ impl HttpApi {
                     "GET /torrents": "List torrents (default torrent is 0)",
                     "GET /torrents/{index}": "Torrent details",
                     "GET /torrents/{index}/haves": "The bitfield of have pieces",
-                    "GET /torrents/{index}/stats": "Torrent stats",
+                    "GET /torrents/{index}/stats/v1": "Torrent stats",
                     "GET /torrents/{index}/peer_stats": "Per peer stats",
-                    // This is kind of not secure as it just reads any local file that it has access to,
+                    "POST /torrents/{index}/pause": "Pause torrent",
-                    // or any URL, but whatever, ok for our purposes / threat model.
+                    "POST /torrents/{index}/start": "Resume torrent",
+                    "POST /torrents/{index}/forget": "Forget about the torrent, keep the files",
+                    "POST /torrents/{index}/delete": "Forget about the torrent, remove the files",
                     "POST /torrents": "Add a torrent here. magnet: or http:// or a local file.",
+                    "POST /rust_log": "Set RUST_LOG to this post launch (for debugging)",
                     "GET /web/": "Web UI",
                 },
                 "server": "rqbit",
@@ -151,6 +155,13 @@ impl HttpApi {
             state.api_torrent_action_delete(idx).map(axum::Json)
         }
 
+        async fn set_rust_log(
+            State(state): State<ApiState>,
+            new_value: String,
+        ) -> Result<impl IntoResponse> {
+            state.api_set_rust_log(new_value).map(axum::Json)
+        }
+
         #[allow(unused_mut)]
         let mut app = Router::new()
             .route("/", get(api_root))
@@ -165,7 +176,8 @@ impl HttpApi {
             .route("/torrents/:id/pause", post(torrent_action_pause))
             .route("/torrents/:id/start", post(torrent_action_start))
             .route("/torrents/:id/forget", post(torrent_action_forget))
-            .route("/torrents/:id/delete", post(torrent_action_delete));
+            .route("/torrents/:id/delete", post(torrent_action_delete))
+            .route("/rust_log", post(set_rust_log));
 
         #[cfg(feature = "webui")]
         {
@@ -383,15 +395,17 @@ impl TorrentAddQueryParams {
 struct ApiInternal {
     startup_time: Instant,
     session: Arc<Session>,
+    rust_log_reload_tx: Option<UnboundedSender<String>>,
 }
 
 type ApiState = Arc<ApiInternal>;
 
 impl ApiInternal {
-    pub fn new(session: Arc<Session>) -> Self {
+    pub fn new(session: Arc<Session>, rust_log_reload_tx: Option<UnboundedSender<String>>) -> Self {
         Self {
             startup_time: Instant::now(),
             session,
+            rust_log_reload_tx,
         }
     }
 
@@ -460,6 +474,16 @@ impl ApiInternal {
         Ok(Default::default())
     }
 
+    fn api_set_rust_log(&self, new_value: String) -> Result<EmptyJsonResponse> {
+        let tx = self
+            .rust_log_reload_tx
+            .as_ref()
+            .context("rust_log_reload_tx was not set")?;
+        tx.send(new_value)
+            .context("noone is listening to RUST_LOG changes")?;
+        Ok(Default::default())
+    }
+
     pub async fn api_add_torrent(
         &self,
         add: AddTorrent<'_>,

crates/librqbit/src/torrent_state/live/mod.rs

@@ -730,7 +730,7 @@ impl<'a> PeerConnectionHandler for &'a PeerHandler {
             }
             Message::Have(h) => self.on_have(h),
             Message::NotInterested => {
-                info!("received \"not interested\", but we don't care yet")
+                debug!("received \"not interested\", but we don't care yet")
             }
             message => {
                 warn!("received unsupported message {:?}, ignoring", message);

crates/rqbit/Cargo.toml

@@ -13,7 +13,7 @@ readme = "README.md"
 
 [features]
 default = ["sha1-system", "default-tls", "webui"]
-tokio-console = ["console-subscriber"]
+tokio-console = ["console-subscriber",]
 webui = ["librqbit/webui"]
 timed_existence = ["librqbit/timed_existence"]
 sha1-system = ["librqbit/sha1-system"]

crates/rqbit/src/main.rs

@@ -134,7 +134,8 @@ enum SubCommand {
     Download(DownloadOpts),
 }
 
-fn init_logging(opts: &Opts) {
+// Iint logging and make a channel to send new RUST_LOG values to.
+fn init_logging(opts: &Opts) -> tokio::sync::mpsc::UnboundedSender<String> {
     let default_rust_log = match opts.log_level.as_ref() {
         Some(level) => match level {
             LogLevel::Trace => "trace",
@@ -147,13 +148,16 @@ fn init_logging(opts: &Opts) {
     };
     let stderr_filter = match std::env::var("RUST_LOG").ok() {
         Some(rust_log) => EnvFilter::builder()
-            .parse(&rust_log)
+            .parse(rust_log)
             .expect("can't parse RUST_LOG"),
         None => EnvFilter::builder()
             .parse(default_rust_log)
             .expect("can't parse default_rust_log"),
     };
 
+    let (stderr_filter, reload_stderr_filter) =
+        tracing_subscriber::reload::Layer::new(stderr_filter);
+
     use tracing_subscriber::{fmt, prelude::*, EnvFilter};
 
     #[cfg(feature = "tokio-console")]
@@ -187,6 +191,27 @@ fn init_logging(opts: &Opts) {
             .with(stderr_filter)
             .init();
     }
+
+    let (reload_tx, mut reload_rx) = tokio::sync::mpsc::unbounded_channel::<String>();
+    spawn(
+        "fmt_filter_reloader",
+        error_span!("fmt_filter_reloader"),
+        async move {
+            while let Some(rust_log) = reload_rx.recv().await {
+                let stderr_env_filter = match EnvFilter::builder().parse(&rust_log) {
+                    Ok(f) => f,
+                    Err(e) => {
+                        eprintln!("can't parse env filter {:?}: {:#?}", rust_log, e);
+                        continue;
+                    }
+                };
+                eprintln!("setting RUST_LOG to {:?}", rust_log);
+                let _ = reload_stderr_filter.reload(stderr_env_filter);
+            }
+            Ok(())
+        },
+    );
+    reload_tx
 }
 
 fn _start_deadlock_detector_thread() {
@@ -248,7 +273,7 @@ fn main() -> anyhow::Result<()> {
 }
 
 async fn async_main(opts: Opts, spawner: BlockingSpawner) -> anyhow::Result<()> {
-    init_logging(&opts);
+    let logging_reload_tx = init_logging(&opts);
 
     let sopts = SessionOptions {
         disable_dht: opts.disable_dht,
@@ -331,7 +356,7 @@ async fn async_main(opts: Opts, spawner: BlockingSpawner) -> anyhow::Result<()>
                     trace_span!("stats_printer"),
                     stats_printer(session.clone()),
                 );
-                let http_api = HttpApi::new(session);
+                let http_api = HttpApi::new(session, Some(logging_reload_tx));
                 let http_api_listen_addr = opts.http_api_listen_addr;
                 http_api
                     .make_http_api_and_run(http_api_listen_addr)
@@ -411,7 +436,7 @@ async fn async_main(opts: Opts, spawner: BlockingSpawner) -> anyhow::Result<()>
                     trace_span!("stats_printer"),
                     stats_printer(session.clone()),
                 );
-                let http_api = HttpApi::new(session.clone());
+                let http_api = HttpApi::new(session.clone(), Some(logging_reload_tx));
                 let http_api_listen_addr = opts.http_api_listen_addr;
                 spawn(
                     "http_api",