Merge 062464175e into f230f2ce0e

CODE_OF_CONDUCT.md

@@ -1,19 +1,17 @@
-# Code of Conduct
+# TELEMT Code of Conduct
 
 ## 1. Purpose
 
 Telemt exists to solve technical problems.
 
-Telemt is open to contributors who want to learn, improve and build meaningful systems together.
+It is not a platform for ideology, politics, or personal agendas.
 
-It is a place for building, testing, reasoning, documenting, and improving systems.
+All interaction here is defined by systems, constraints, and outcomes.
 
-Discussions that advance this work are in scope. Discussions that divert it are not.
-
-Technology has consequences. Responsibility is inherent.
+Technology has consequences.
+Responsibility is inherent.
 
 > **Zweck bestimmt die Form.**
-
 > Purpose defines form.
 
 ---
@@ -26,24 +24,20 @@ Technology has consequences. Responsibility is inherent.
 * **Clarity over noise**
   Communication is structured, concise, and relevant.
 
-* **Openness with standards**
-  Participation is open. The work remains disciplined.
+* **Independence**
+  Telemt does not represent any state, ideology, or organization.
 
-* **Independence of judgment**
-  Claims are evaluated on technical merit, not affiliation or posture.
+* **Open participation**
+  Access is open. Standards are not.
 
 * **Responsibility over capability**
   Capability does not justify careless use.
 
 * **Cooperation over friction**
-  Progress depends on coordination, mutual support, and honest review.
+  Progress is achieved through coordination and mutual support.
 
-* **Good intent, rigorous method**
-  Assume good intent, but require rigor.
-
-> **Aussagen gelten nach ihrer Begründung.**
-
-> Claims are weighed by evidence.
+> **Fakten sind nicht verhandelbar.**
+> Facts are not negotiable.
 
 ---
 
@@ -59,12 +53,7 @@ Participants are expected to:
 * Help others reach correct and reproducible outcomes
 * Act in a way that improves the system as a whole
 
-Precision is learned.
-
-New contributors are welcome. They are expected to grow into these standards. Existing contributors are expected to make that growth possible.
-
 > **Wer behauptet, belegt.**
-
 > Whoever claims, proves.
 
 ---
@@ -73,25 +62,22 @@ New contributors are welcome. They are expected to grow into these standards. Ex
 
 The following is not allowed:
 
-* Personal attacks, insults, harassment, or intimidation
-* Repeatedly derailing discussion away from Telemt’s purpose
+* Personal attacks, insults, harassment, intimidation
+* Political discourse, propaganda, ideological conflict
+* Off-topic or disruptive discussion
 * Spam, flooding, or repeated low-quality input
 * Misinformation presented as fact
-* Attempts to degrade, destabilize, or exhaust Telemt or its participants
-* Use of Telemt or its spaces to enable harm
-
-Telemt is not a venue for disputes that displace technical work.
-Such discussions may be closed, removed, or redirected.
+* Attempts to degrade or destabilize Telemt
+* Use of Telemt or its space to enable harm
 
 > **Störung ist kein Beitrag.**
-
 > Disruption is not contribution.
 
 ---
 
 ## 5. Security and Misuse
 
-Telemt is intended for responsible use.
+Telemt is intended for lawful and responsible use.
 
 * Do not use it to plan, coordinate, or execute harm
 * Do not publish vulnerabilities without responsible disclosure
@@ -100,24 +86,11 @@ Telemt is intended for responsible use.
 Security is both technical and behavioral.
 
 > **Verantwortung endet nicht am Code.**
-
 > Responsibility does not end at the code.
 
 ---
 
-## 6. Openness
-
-Telemt is open to contributors of different backgrounds, experience levels, and working styles.
-
-Standards are public, legible, and applied to the work itself.
-
-Questions are welcome. Careful disagreement is welcome. Honest correction is welcome.
-
-Gatekeeping by obscurity, status signaling, or hostility is not.
-
----
-
-## 7. Scope
+## 6. Scope
 
 This Code of Conduct applies to all official spaces:
 
@@ -127,43 +100,31 @@ This Code of Conduct applies to all official spaces:
 
 ---
 
-## 8. Maintainer Stewardship
+## 7. Enforcement
 
-Maintainers are responsible for final decisions in matters of conduct, scope, and direction.
+Maintainers may act to preserve the integrity of Telemt:
 
-This responsibility is stewardship: preserving continuity, protecting signal, maintaining standards, and keeping Telemt workable for others.
+* Remove content
+* Lock discussions
+* Reject contributions
+* Restrict or ban participants
 
-Judgment should be exercised with restraint, consistency, and institutional responsibility.
-
-Not every decision requires extended debate.
-Not every intervention requires public explanation.
-
-All decisions are expected to serve the durability, clarity, and integrity of Telemt.
+Actions are taken to maintain function, continuity, and signal quality.
 
 > **Ordnung ist Voraussetzung der Funktion.**
-
 > Order is the precondition of function.
 
 ---
 
-## 9. Enforcement
+## 8. Maintainer Authority
 
-Maintainers may act to preserve the integrity of Telemt, including by:
+Maintainers have final authority in interpretation and enforcement.
 
-* Removing content
-* Locking discussions
-* Rejecting contributions
-* Restricting or banning participants
-
-Actions are taken to maintain function, continuity, and signal quality.
-
-Where possible, correction is preferred to exclusion.
-
-Where necessary, exclusion is preferred to decay.
+Authority exists to ensure continuity, consistency, and technical direction.
 
 ---
 
-## 10. Final
+## 9. Final
 
 Telemt is built on discipline, structure, and shared intent.
 
@@ -171,23 +132,19 @@ Signal over noise.
 Facts over opinion.
 Systems over rhetoric.
 
-Work is collective.
+Work here is collective.
 Outcomes are shared.
 Responsibility is distributed.
 
-Precision is learned.
-Rigor is expected.
-Help is part of the work.
-
 > **Ordnung ist Voraussetzung der Freiheit.**
 
-If you contribute — contribute with care.
+If you contribute — contribute with precision.
 If you speak — speak with substance.
 If you engage — engage constructively.
 
 ---
 
-## 11. After All
+## 10. After All
 
 Systems outlive intentions.
 
@@ -195,14 +152,12 @@ What is built will be used.
 What is released will propagate.
 What is maintained will define the future state.
 
-There is no neutral infrastructure, only infrastructure shaped well or poorly.
+There is no neutral infrastructure.
 
 > **Jedes System trägt Verantwortung.**
-
 > Every system carries responsibility.
 
 Stability requires discipline.
 Freedom requires structure.
-Trust requires honesty.
 
 In the end, the system reflects its contributors.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "telemt"
-version = "3.3.24"
+version = "3.3.23"
 edition = "2024"
 
 [dependencies]

src/config/load.rs

@@ -646,11 +646,6 @@ impl ProxyConfig {
                 "general.me_route_backpressure_base_timeout_ms must be > 0".to_string(),
             ));
         }
-        if config.general.me_route_backpressure_base_timeout_ms > 5000 {
-            return Err(ProxyError::Config(
-                "general.me_route_backpressure_base_timeout_ms must be within [1, 5000]".to_string(),
-            ));
-        }
 
         if config.general.me_route_backpressure_high_timeout_ms
             < config.general.me_route_backpressure_base_timeout_ms
@@ -659,11 +654,6 @@ impl ProxyConfig {
                 "general.me_route_backpressure_high_timeout_ms must be >= general.me_route_backpressure_base_timeout_ms".to_string(),
             ));
         }
-        if config.general.me_route_backpressure_high_timeout_ms > 5000 {
-            return Err(ProxyError::Config(
-                "general.me_route_backpressure_high_timeout_ms must be within [1, 5000]".to_string(),
-            ));
-        }
 
         if !(1..=100).contains(&config.general.me_route_backpressure_high_watermark_pct) {
             return Err(ProxyError::Config(
@@ -1678,47 +1668,6 @@ mod tests {
         let _ = std::fs::remove_file(path_valid);
     }
 
-    #[test]
-    fn me_route_backpressure_base_timeout_ms_out_of_range_is_rejected() {
-        let toml = r#"
-            [general]
-            me_route_backpressure_base_timeout_ms = 5001
-
-            [censorship]
-            tls_domain = "example.com"
-
-            [access.users]
-            user = "00000000000000000000000000000000"
-        "#;
-        let dir = std::env::temp_dir();
-        let path = dir.join("telemt_me_route_backpressure_base_timeout_ms_out_of_range_test.toml");
-        std::fs::write(&path, toml).unwrap();
-        let err = ProxyConfig::load(&path).unwrap_err().to_string();
-        assert!(err.contains("general.me_route_backpressure_base_timeout_ms must be within [1, 5000]"));
-        let _ = std::fs::remove_file(path);
-    }
-
-    #[test]
-    fn me_route_backpressure_high_timeout_ms_out_of_range_is_rejected() {
-        let toml = r#"
-            [general]
-            me_route_backpressure_base_timeout_ms = 100
-            me_route_backpressure_high_timeout_ms = 5001
-
-            [censorship]
-            tls_domain = "example.com"
-
-            [access.users]
-            user = "00000000000000000000000000000000"
-        "#;
-        let dir = std::env::temp_dir();
-        let path = dir.join("telemt_me_route_backpressure_high_timeout_ms_out_of_range_test.toml");
-        std::fs::write(&path, toml).unwrap();
-        let err = ProxyConfig::load(&path).unwrap_err().to_string();
-        assert!(err.contains("general.me_route_backpressure_high_timeout_ms must be within [1, 5000]"));
-        let _ = std::fs::remove_file(path);
-    }
-
     #[test]
     fn me_route_no_writer_wait_ms_out_of_range_is_rejected() {
         let toml = r#"

src/metrics.rs

@@ -1692,57 +1692,6 @@ async fn render_metrics(stats: &Stats, config: &ProxyConfig, ip_tracker: &UserIp
         }
     );
 
-    let _ = writeln!(
-        out,
-        "# HELP telemt_me_writer_close_signal_drop_total Close-signal drops for already-removed ME writers"
-    );
-    let _ = writeln!(out, "# TYPE telemt_me_writer_close_signal_drop_total counter");
-    let _ = writeln!(
-        out,
-        "telemt_me_writer_close_signal_drop_total {}",
-        if me_allows_normal {
-            stats.get_me_writer_close_signal_drop_total()
-        } else {
-            0
-        }
-    );
-
-    let _ = writeln!(
-        out,
-        "# HELP telemt_me_writer_close_signal_channel_full_total Close-signal drops caused by full writer command channels"
-    );
-    let _ = writeln!(
-        out,
-        "# TYPE telemt_me_writer_close_signal_channel_full_total counter"
-    );
-    let _ = writeln!(
-        out,
-        "telemt_me_writer_close_signal_channel_full_total {}",
-        if me_allows_normal {
-            stats.get_me_writer_close_signal_channel_full_total()
-        } else {
-            0
-        }
-    );
-
-    let _ = writeln!(
-        out,
-        "# HELP telemt_me_draining_writers_reap_progress_total Draining-writer removals processed by reap cleanup"
-    );
-    let _ = writeln!(
-        out,
-        "# TYPE telemt_me_draining_writers_reap_progress_total counter"
-    );
-    let _ = writeln!(
-        out,
-        "telemt_me_draining_writers_reap_progress_total {}",
-        if me_allows_normal {
-            stats.get_me_draining_writers_reap_progress_total()
-        } else {
-            0
-        }
-    );
-
     let _ = writeln!(out, "# HELP telemt_me_writer_removed_total Total ME writer removals");
     let _ = writeln!(out, "# TYPE telemt_me_writer_removed_total counter");
     let _ = writeln!(
@@ -2175,13 +2124,6 @@ mod tests {
         assert!(output.contains("# TYPE telemt_me_rpc_proxy_req_signal_sent_total counter"));
         assert!(output.contains("# TYPE telemt_me_idle_close_by_peer_total counter"));
         assert!(output.contains("# TYPE telemt_me_writer_removed_total counter"));
-        assert!(output.contains("# TYPE telemt_me_writer_close_signal_drop_total counter"));
-        assert!(output.contains(
-            "# TYPE telemt_me_writer_close_signal_channel_full_total counter"
-        ));
-        assert!(output.contains(
-            "# TYPE telemt_me_draining_writers_reap_progress_total counter"
-        ));
         assert!(output.contains("# TYPE telemt_pool_drain_soft_evict_total counter"));
         assert!(output.contains("# TYPE telemt_pool_drain_soft_evict_writer_total counter"));
         assert!(output.contains(

src/stats/mod.rs

@@ -123,9 +123,6 @@ pub struct Stats {
     pool_drain_soft_evict_total: AtomicU64,
     pool_drain_soft_evict_writer_total: AtomicU64,
     pool_stale_pick_total: AtomicU64,
-    me_writer_close_signal_drop_total: AtomicU64,
-    me_writer_close_signal_channel_full_total: AtomicU64,
-    me_draining_writers_reap_progress_total: AtomicU64,
     me_writer_removed_total: AtomicU64,
     me_writer_removed_unexpected_total: AtomicU64,
     me_refill_triggered_total: AtomicU64,
@@ -737,24 +734,6 @@ impl Stats {
             self.pool_stale_pick_total.fetch_add(1, Ordering::Relaxed);
         }
     }
-    pub fn increment_me_writer_close_signal_drop_total(&self) {
-        if self.telemetry_me_allows_normal() {
-            self.me_writer_close_signal_drop_total
-                .fetch_add(1, Ordering::Relaxed);
-        }
-    }
-    pub fn increment_me_writer_close_signal_channel_full_total(&self) {
-        if self.telemetry_me_allows_normal() {
-            self.me_writer_close_signal_channel_full_total
-                .fetch_add(1, Ordering::Relaxed);
-        }
-    }
-    pub fn increment_me_draining_writers_reap_progress_total(&self) {
-        if self.telemetry_me_allows_normal() {
-            self.me_draining_writers_reap_progress_total
-                .fetch_add(1, Ordering::Relaxed);
-        }
-    }
     pub fn increment_me_writer_removed_total(&self) {
         if self.telemetry_me_allows_debug() {
             self.me_writer_removed_total.fetch_add(1, Ordering::Relaxed);
@@ -1280,17 +1259,6 @@ impl Stats {
     pub fn get_pool_stale_pick_total(&self) -> u64 {
         self.pool_stale_pick_total.load(Ordering::Relaxed)
     }
-    pub fn get_me_writer_close_signal_drop_total(&self) -> u64 {
-        self.me_writer_close_signal_drop_total.load(Ordering::Relaxed)
-    }
-    pub fn get_me_writer_close_signal_channel_full_total(&self) -> u64 {
-        self.me_writer_close_signal_channel_full_total
-            .load(Ordering::Relaxed)
-    }
-    pub fn get_me_draining_writers_reap_progress_total(&self) -> u64 {
-        self.me_draining_writers_reap_progress_total
-            .load(Ordering::Relaxed)
-    }
     pub fn get_me_writer_removed_total(&self) -> u64 {
         self.me_writer_removed_total.load(Ordering::Relaxed)
     }

src/transport/middle_proxy/health.rs

@@ -314,8 +314,6 @@ pub(super) async fn reap_draining_writers(
         }
         pool.stats.increment_pool_force_close_total();
         pool.remove_writer_and_close_clients(writer_id).await;
-        pool.stats
-            .increment_me_draining_writers_reap_progress_total();
         closed_total = closed_total.saturating_add(1);
     }
     for writer_id in empty_writer_ids {
@@ -326,8 +324,6 @@ pub(super) async fn reap_draining_writers(
             continue;
         }
         pool.remove_writer_and_close_clients(writer_id).await;
-        pool.stats
-            .increment_me_draining_writers_reap_progress_total();
         closed_total = closed_total.saturating_add(1);
     }
 

src/transport/middle_proxy/health_regression_tests.rs

@@ -4,7 +4,6 @@ use std::sync::Arc;
 use std::sync::atomic::{AtomicBool, AtomicU8, AtomicU32, AtomicU64, Ordering};
 use std::time::{Duration, Instant};
 
-use bytes::Bytes;
 use tokio::sync::mpsc;
 use tokio_util::sync::CancellationToken;
 
@@ -210,89 +209,6 @@ async fn reap_draining_writers_removes_empty_draining_writers() {
     assert_eq!(current_writer_ids(&pool).await, vec![3]);
 }
 
-#[tokio::test]
-async fn reap_draining_writers_does_not_block_on_stuck_writer_close_signal() {
-    let pool = make_pool(128).await;
-    let now_epoch_secs = MePool::now_epoch_secs();
-
-    let (blocked_tx, blocked_rx) = mpsc::channel::<WriterCommand>(1);
-    assert!(
-        blocked_tx
-            .try_send(WriterCommand::Data(Bytes::from_static(b"stuck")))
-            .is_ok()
-    );
-    let blocked_rx_guard = tokio::spawn(async move {
-        let _hold_rx = blocked_rx;
-        tokio::time::sleep(Duration::from_secs(30)).await;
-    });
-
-    let blocked_writer_id = 90u64;
-    let blocked_writer = MeWriter {
-        id: blocked_writer_id,
-        addr: SocketAddr::new(
-            IpAddr::V4(Ipv4Addr::LOCALHOST),
-            4500 + blocked_writer_id as u16,
-        ),
-        source_ip: IpAddr::V4(Ipv4Addr::LOCALHOST),
-        writer_dc: 2,
-        generation: 1,
-        contour: Arc::new(AtomicU8::new(WriterContour::Draining.as_u8())),
-        created_at: Instant::now() - Duration::from_secs(blocked_writer_id),
-        tx: blocked_tx.clone(),
-        cancel: CancellationToken::new(),
-        degraded: Arc::new(AtomicBool::new(false)),
-        rtt_ema_ms_x10: Arc::new(AtomicU32::new(0)),
-        draining: Arc::new(AtomicBool::new(true)),
-        draining_started_at_epoch_secs: Arc::new(AtomicU64::new(
-            now_epoch_secs.saturating_sub(120),
-        )),
-        drain_deadline_epoch_secs: Arc::new(AtomicU64::new(0)),
-        allow_drain_fallback: Arc::new(AtomicBool::new(false)),
-    };
-    pool.writers.write().await.push(blocked_writer);
-    pool.registry
-        .register_writer(blocked_writer_id, blocked_tx)
-        .await;
-    pool.conn_count.fetch_add(1, Ordering::Relaxed);
-
-    insert_draining_writer(&pool, 91, now_epoch_secs.saturating_sub(110), 0, 0).await;
-
-    let mut warn_next_allowed = HashMap::new();
-    let mut soft_evict_next_allowed = HashMap::new();
-
-    let reap_res = tokio::time::timeout(
-        Duration::from_millis(500),
-        reap_draining_writers(&pool, &mut warn_next_allowed, &mut soft_evict_next_allowed),
-    )
-    .await;
-    blocked_rx_guard.abort();
-
-    assert!(reap_res.is_ok(), "reap should not block on close signal");
-    assert!(current_writer_ids(&pool).await.is_empty());
-    assert_eq!(pool.stats.get_me_writer_close_signal_drop_total(), 2);
-    assert_eq!(pool.stats.get_me_writer_close_signal_channel_full_total(), 1);
-    assert_eq!(pool.stats.get_me_draining_writers_reap_progress_total(), 2);
-    let activity = pool.registry.writer_activity_snapshot().await;
-    assert!(!activity.bound_clients_by_writer.contains_key(&blocked_writer_id));
-    assert!(!activity.bound_clients_by_writer.contains_key(&91));
-    let (probe_conn_id, _rx) = pool.registry.register().await;
-    assert!(
-        !pool.registry
-            .bind_writer(
-                probe_conn_id,
-                blocked_writer_id,
-                ConnMeta {
-                    target_dc: 2,
-                    client_addr: SocketAddr::new(IpAddr::V4(Ipv4Addr::LOCALHOST), 6400),
-                    our_addr: SocketAddr::new(IpAddr::V4(Ipv4Addr::LOCALHOST), 443),
-                    proto_flags: 0,
-                },
-            )
-            .await
-    );
-    let _ = pool.registry.unregister(probe_conn_id).await;
-}
-
 #[tokio::test]
 async fn reap_draining_writers_overflow_closes_oldest_non_empty_writers() {
     let pool = make_pool(2).await;

src/transport/middle_proxy/pool_writer.rs

@@ -8,7 +8,6 @@ use bytes::Bytes;
 use bytes::BytesMut;
 use rand::Rng;
 use tokio::sync::mpsc;
-use tokio::sync::mpsc::error::TrySendError;
 use tokio_util::sync::CancellationToken;
 use tracing::{debug, info, warn};
 
@@ -492,9 +491,11 @@ impl MePool {
     }
 
     pub(crate) async fn remove_writer_and_close_clients(self: &Arc<Self>, writer_id: u64) {
-        // Full client cleanup now happens inside `registry.writer_lost` to keep
-        // writer reap/remove paths strictly non-blocking per connection.
-        let _ = self.remove_writer_only(writer_id).await;
+        let conns = self.remove_writer_only(writer_id).await;
+        for bound in conns {
+            let _ = self.registry.route(bound.conn_id, super::MeResponse::Close).await;
+            let _ = self.registry.unregister(bound.conn_id).await;
+        }
     }
 
     async fn remove_writer_only(self: &Arc<Self>, writer_id: u64) -> Vec<BoundConn> {
@@ -524,11 +525,6 @@ impl MePool {
                 self.conn_count.fetch_sub(1, Ordering::Relaxed);
             }
         }
-        // State invariant:
-        // - writer is removed from `self.writers` (pool visibility),
-        // - writer is removed from registry routing/binding maps via `writer_lost`.
-        // The close command below is only a best-effort accelerator for task shutdown.
-        // Cleanup progress must never depend on command-channel availability.
         let conns = self.registry.writer_lost(writer_id).await;
         {
             let mut tracker = self.ping_tracker.lock().await;
@@ -536,25 +532,7 @@ impl MePool {
         }
         self.rtt_stats.lock().await.remove(&writer_id);
         if let Some(tx) = close_tx {
-            match tx.try_send(WriterCommand::Close) {
-                Ok(()) => {}
-                Err(TrySendError::Full(_)) => {
-                    self.stats.increment_me_writer_close_signal_drop_total();
-                    self.stats
-                        .increment_me_writer_close_signal_channel_full_total();
-                    debug!(
-                        writer_id,
-                        "Skipping close signal for removed writer: command channel is full"
-                    );
-                }
-                Err(TrySendError::Closed(_)) => {
-                    self.stats.increment_me_writer_close_signal_drop_total();
-                    debug!(
-                        writer_id,
-                        "Skipping close signal for removed writer: command channel is closed"
-                    );
-                }
-            }
+            let _ = tx.send(WriterCommand::Close).await;
         }
         if trigger_refill
             && let Some(addr) = removed_addr

src/transport/middle_proxy/reader.rs

@@ -8,7 +8,6 @@ use bytes::{Bytes, BytesMut};
 use tokio::io::AsyncReadExt;
 use tokio::net::TcpStream;
 use tokio::sync::{Mutex, mpsc};
-use tokio::sync::mpsc::error::TrySendError;
 use tokio_util::sync::CancellationToken;
 use tracing::{debug, trace, warn};
 
@@ -174,12 +173,12 @@ pub(crate) async fn reader_loop(
             } else if pt == RPC_CLOSE_EXT_U32 && body.len() >= 8 {
                 let cid = u64::from_le_bytes(body[0..8].try_into().unwrap());
                 debug!(cid, "RPC_CLOSE_EXT from ME");
-                let _ = reg.route_nowait(cid, MeResponse::Close).await;
+                reg.route(cid, MeResponse::Close).await;
                 reg.unregister(cid).await;
             } else if pt == RPC_CLOSE_CONN_U32 && body.len() >= 8 {
                 let cid = u64::from_le_bytes(body[0..8].try_into().unwrap());
                 debug!(cid, "RPC_CLOSE_CONN from ME");
-                let _ = reg.route_nowait(cid, MeResponse::Close).await;
+                reg.route(cid, MeResponse::Close).await;
                 reg.unregister(cid).await;
             } else if pt == RPC_PING_U32 && body.len() >= 8 {
                 let ping_id = i64::from_le_bytes(body[0..8].try_into().unwrap());
@@ -187,15 +186,13 @@ pub(crate) async fn reader_loop(
                 let mut pong = Vec::with_capacity(12);
                 pong.extend_from_slice(&RPC_PONG_U32.to_le_bytes());
                 pong.extend_from_slice(&ping_id.to_le_bytes());
-                match tx.try_send(WriterCommand::DataAndFlush(Bytes::from(pong))) {
-                    Ok(()) => {}
-                    Err(TrySendError::Full(_)) => {
-                        debug!(ping_id, "PONG dropped: writer command channel is full");
-                    }
-                    Err(TrySendError::Closed(_)) => {
-                        warn!("PONG send failed: writer channel closed");
-                        break;
-                    }
+                if tx
+                    .send(WriterCommand::DataAndFlush(Bytes::from(pong)))
+                    .await
+                    .is_err()
+                {
+                    warn!("PONG send failed");
+                    break;
                 }
             } else if pt == RPC_PONG_U32 && body.len() >= 8 {
                 let ping_id = i64::from_le_bytes(body[0..8].try_into().unwrap());
@@ -235,13 +232,6 @@ async fn send_close_conn(tx: &mpsc::Sender<WriterCommand>, conn_id: u64) {
     let mut p = Vec::with_capacity(12);
     p.extend_from_slice(&RPC_CLOSE_CONN_U32.to_le_bytes());
     p.extend_from_slice(&conn_id.to_le_bytes());
-    match tx.try_send(WriterCommand::DataAndFlush(Bytes::from(p))) {
-        Ok(()) => {}
-        Err(TrySendError::Full(_)) => {
-            debug!(conn_id, "ME close_conn signal skipped: writer command channel is full");
-        }
-        Err(TrySendError::Closed(_)) => {
-            debug!(conn_id, "ME close_conn signal skipped: writer command channel is closed");
-        }
-    }
+
+    let _ = tx.send(WriterCommand::DataAndFlush(Bytes::from(p))).await;
 }

src/transport/middle_proxy/registry.rs

@@ -169,7 +169,6 @@ impl ConnRegistry {
         None
     }
 
-    #[allow(dead_code)]
     pub async fn route(&self, id: u64, resp: MeResponse) -> RouteResult {
         let tx = {
             let inner = self.inner.read().await;
@@ -446,38 +445,30 @@ impl ConnRegistry {
     }
 
     pub async fn writer_lost(&self, writer_id: u64) -> Vec<BoundConn> {
-        let mut close_txs = Vec::<mpsc::Sender<MeResponse>>::new();
-        let mut out = Vec::new();
-        {
-            let mut inner = self.inner.write().await;
-            inner.writers.remove(&writer_id);
-            inner.last_meta_for_writer.remove(&writer_id);
-            inner.writer_idle_since_epoch_secs.remove(&writer_id);
-            let conns = inner
-                .conns_for_writer
-                .remove(&writer_id)
-                .unwrap_or_default()
-                .into_iter()
-                .collect::<Vec<_>>();
+        let mut inner = self.inner.write().await;
+        inner.writers.remove(&writer_id);
+        inner.last_meta_for_writer.remove(&writer_id);
+        inner.writer_idle_since_epoch_secs.remove(&writer_id);
+        let conns = inner
+            .conns_for_writer
+            .remove(&writer_id)
+            .unwrap_or_default()
+            .into_iter()
+            .collect::<Vec<_>>();
 
-            for conn_id in conns {
-                if inner.writer_for_conn.get(&conn_id).copied() != Some(writer_id) {
-                    continue;
-                }
-                inner.writer_for_conn.remove(&conn_id);
-                if let Some(client_tx) = inner.map.remove(&conn_id) {
-                    close_txs.push(client_tx);
-                }
-                if let Some(meta) = inner.meta.remove(&conn_id) {
-                    out.push(BoundConn { conn_id, meta });
-                }
+        let mut out = Vec::new();
+        for conn_id in conns {
+            if inner.writer_for_conn.get(&conn_id).copied() != Some(writer_id) {
+                continue;
+            }
+            inner.writer_for_conn.remove(&conn_id);
+            if let Some(m) = inner.meta.get(&conn_id) {
+                out.push(BoundConn {
+                    conn_id,
+                    meta: m.clone(),
+                });
             }
         }
-
-        for client_tx in close_txs {
-            let _ = client_tx.try_send(MeResponse::Close);
-        }
-
         out
     }
 
@@ -500,7 +491,6 @@ impl ConnRegistry {
 #[cfg(test)]
 mod tests {
     use std::net::{IpAddr, Ipv4Addr, SocketAddr};
-    use std::time::Duration;
 
     use super::ConnMeta;
     use super::ConnRegistry;
@@ -673,39 +663,6 @@ mod tests {
         assert!(registry.is_writer_empty(20).await);
     }
 
-    #[tokio::test]
-    async fn writer_lost_removes_bound_conn_from_registry_and_signals_close() {
-        let registry = ConnRegistry::new();
-        let (conn_id, mut rx) = registry.register().await;
-        let (writer_tx, _writer_rx) = tokio::sync::mpsc::channel(8);
-        registry.register_writer(10, writer_tx).await;
-        let addr = SocketAddr::new(IpAddr::V4(Ipv4Addr::LOCALHOST), 443);
-
-        assert!(
-            registry
-                .bind_writer(
-                    conn_id,
-                    10,
-                    ConnMeta {
-                        target_dc: 2,
-                        client_addr: addr,
-                        our_addr: addr,
-                        proto_flags: 0,
-                    },
-                )
-                .await
-        );
-
-        let lost = registry.writer_lost(10).await;
-        assert_eq!(lost.len(), 1);
-        assert_eq!(lost[0].conn_id, conn_id);
-        assert!(registry.get_writer(conn_id).await.is_none());
-        assert!(registry.get_meta(conn_id).await.is_none());
-        assert_eq!(registry.unregister(conn_id).await, None);
-        let close = tokio::time::timeout(Duration::from_millis(50), rx.recv()).await;
-        assert!(matches!(close, Ok(Some(MeResponse::Close))));
-    }
-
     #[tokio::test]
     async fn bind_writer_rejects_unregistered_writer() {
         let registry = ConnRegistry::new();

src/transport/middle_proxy/send.rs

@@ -643,19 +643,13 @@ impl MePool {
             let mut p = Vec::with_capacity(12);
             p.extend_from_slice(&RPC_CLOSE_EXT_U32.to_le_bytes());
             p.extend_from_slice(&conn_id.to_le_bytes());
-            match w.tx.try_send(WriterCommand::DataAndFlush(Bytes::from(p))) {
-                Ok(()) => {}
-                Err(TrySendError::Full(_)) => {
-                    debug!(
-                        conn_id,
-                        writer_id = w.writer_id,
-                        "ME close skipped: writer command channel is full"
-                    );
-                }
-                Err(TrySendError::Closed(_)) => {
-                    debug!("ME close write failed");
-                    self.remove_writer_and_close_clients(w.writer_id).await;
-                }
+            if w.tx
+                .send(WriterCommand::DataAndFlush(Bytes::from(p)))
+                .await
+                .is_err()
+            {
+                debug!("ME close write failed");
+                self.remove_writer_and_close_clients(w.writer_id).await;
             }
         } else {
             debug!(conn_id, "ME close skipped (writer missing)");
@@ -672,12 +666,8 @@ impl MePool {
             p.extend_from_slice(&conn_id.to_le_bytes());
             match w.tx.try_send(WriterCommand::DataAndFlush(Bytes::from(p))) {
                 Ok(()) => {}
-                Err(TrySendError::Full(_)) => {
-                    debug!(
-                        conn_id,
-                        writer_id = w.writer_id,
-                        "ME close_conn skipped: writer command channel is full"
-                    );
+                Err(TrySendError::Full(cmd)) => {
+                    let _ = tokio::time::timeout(Duration::from_millis(50), w.tx.send(cmd)).await;
                 }
                 Err(TrySendError::Closed(_)) => {
                     debug!(conn_id, "ME close_conn skipped: writer channel closed");