feat: add early shutdown when no requests received for X milliseconds

crates/base/src/worker/supervisor/strategy_per_worker.rs

@@ -3,6 +3,7 @@ use std::sync::atomic::AtomicUsize;
 use std::sync::atomic::Ordering;
 use std::sync::Arc;
 use std::time::Duration;
+use std::time::SystemTime;
 
 use base_rt::RuntimeState;
 use deno_core::unsync::sync::AtomicFlag;
@@ -37,6 +38,8 @@ use super::V8HandleTerminationData;
 
 #[derive(Debug, Default)]
 struct State {
+  req_absent_duration: Option<Duration>,
+
   is_worker_entered: bool,
   is_wall_clock_limit_disabled: bool,
   is_wall_clock_beforeunload_armed: bool,
@@ -49,6 +52,7 @@ struct State {
   wall_clock_alerts: usize,
 
   req_ack_count: usize,
+  last_req_ack: Option<SystemTime>,
   req_demand: Arc<AtomicUsize>,
 
   runtime: Arc<RuntimeState>,
@@ -80,6 +84,7 @@ impl State {
 
   fn req_acknowledged(&mut self) {
     self.req_ack_count += 1;
+    self.last_req_ack = Some(SystemTime::now());
     self.update_runtime_state();
   }
 
@@ -92,6 +97,14 @@ impl State {
       || self.is_cpu_time_soft_limit_reached
       || self.is_mem_half_reached
       || self.wall_clock_alerts == 2
+      || matches!(
+        self
+          .last_req_ack
+          .as_ref()
+          .zip(self.req_absent_duration)
+          .and_then(|(t, d)| t.checked_add(d)),
+        Some(t) if t < SystemTime::now()
+      )
   }
 
   fn have_all_reqs_been_acknowledged(&self) -> bool {
@@ -143,6 +156,16 @@ pub async fn supervise(args: Arguments) -> (ShutdownReason, i64) {
 
   let mut complete_reason = None::<ShutdownReason>;
   let mut state = State {
+    req_absent_duration: runtime_opts
+      .context
+      .as_ref()
+      .and_then(|it| it.get("supervisor"))
+      .and_then(|it| {
+        it.get("requestAbsentTimeoutMs")
+          .and_then(|it| it.as_u64())
+          .map(Duration::from_millis)
+      }),
+
     is_wall_clock_limit_disabled: worker_timeout_ms == 0,
     is_cpu_time_limit_disabled: cpu_time_soft_limit_ms == 0
       && cpu_time_hard_limit_ms == 0,

crates/base/test_cases/main/index.ts

@@ -1,6 +1,6 @@
 console.log("main function started");
 
-function parseIntFromHeadersOrDefault(req: Request, key: string, val: number) {
+function parseIntFromHeadersOrDefault(req: Request, key: string, val?: number) {
   const headerValue = req.headers.get(key);
   if (!headerValue) {
     return val;
@@ -62,7 +62,14 @@ Deno.serve((req: Request) => {
     const envVars = Object.keys(envVarsObj).map((k) => [k, envVarsObj[k]]);
     const context = {
       sourceMap: req.headers.get("x-context-source-map") == "true",
-      useReadSyncFileAPI: req.headers.get("x-use-read-sync-file-api") == "true",
+      useReadSyncFileAPI:
+        req.headers.get("x-context-use-read-sync-file-api") == "true",
+      supervisor: {
+        requestAbsentTimeoutMs: parseIntFromHeadersOrDefault(
+          req,
+          "x-context-supervisor-request-absent-timeout-ms",
+        ),
+      },
     };
 
     return await EdgeRuntime.userWorkers.create({

crates/base/tests/integration_tests.rs

@@ -2522,7 +2522,10 @@ async fn test_issue_func_205() {
       b.uri("/issue-func-205")
         .header("x-cpu-time-soft-limit-ms", HeaderValue::from_static("500"))
         .header("x-cpu-time-hard-limit-ms", HeaderValue::from_static("1000"))
-        .header("x-use-read-sync-file-api", HeaderValue::from_static("true"))
+        .header(
+          "x-context-use-read-sync-file-api",
+          HeaderValue::from_static("true"),
+        )
         .body(Body::empty())
         .context("can't make request")
     })
@@ -3865,6 +3868,49 @@ async fn test_eszip_wasm_import() {
   );
 }
 
+#[tokio::test]
+#[serial]
+async fn test_request_absent_timeout() {
+  let (tx, mut rx) = mpsc::unbounded_channel();
+  let tb = TestBedBuilder::new("./test_cases/main")
+    .with_per_worker_policy(None)
+    .with_worker_event_sender(Some(tx))
+    .build()
+    .await;
+
+  let resp = tb
+    .request(|b| {
+      b.uri("/sleep-5000ms")
+        .header("x-worker-timeout-ms", HeaderValue::from_static("3600000"))
+        .header(
+          "x-context-supervisor-request-absent-timeout-ms",
+          HeaderValue::from_static("1000"),
+        )
+        .body(Body::empty())
+        .context("can't make request")
+    })
+    .await
+    .unwrap();
+
+  assert_eq!(resp.status().as_u16(), StatusCode::OK);
+
+  sleep(Duration::from_secs(3)).await;
+  rx.close();
+  tb.exit(Duration::from_secs(TESTBED_DEADLINE_SEC)).await;
+
+  while let Some(ev) = rx.recv().await {
+    let WorkerEvents::Shutdown(ev) = ev.event else {
+      continue;
+    };
+    if ev.reason != ShutdownReason::EarlyDrop {
+      break;
+    }
+    return;
+  }
+
+  unreachable!("test failed");
+}
+
 #[derive(Deserialize)]
 struct ErrorResponsePayload {
   msg: String,

types/global.d.ts

@@ -49,6 +49,9 @@ interface UserWorkerCreateContext {
   shouldBootstrapMockFnThrowError?: boolean | null;
   suppressEszipMigrationWarning?: boolean | null;
   useReadSyncFileAPI?: boolean | null;
+  supervisor?: {
+    requestAbsentTimeoutMs?: number | null;
+  };
 }
 
 interface UserWorkerCreateOptions {