Fix solver startup race condition with Notify

The HTTP-01 and TLS-ALPN-01 solvers used tokio::sync::Notify to signal
that the server task had started. If the spawned task called
notify_waiters() before the caller registered with notified(), the
notification was lost and the solver would hang indefinitely.

Fix by creating the Notified future before spawning the task.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -6,6 +6,8 @@
 
 ### Fixes
 
+- Fix HTTP-01 and TLS-ALPN-01 solvers sometimes hanging on startup due to a `Notify` race condition
+
 ### Changes
 
 ## 0.7.0 (2026-04-17)

debian/changelog

@@ -1,6 +1,6 @@
 certforge (0.8.0-1) unstable; urgency=low
 
-  * No changes
+  * Fix HTTP-01 and TLS-ALPN-01 solvers hanging on startup
 
  -- Roman Kivalin <roman@shl.dev>  Thu, 17 Apr 2026 00:00:00 +0000
 

src/solver/http01.rs

@@ -61,6 +61,9 @@ impl Http01StandaloneSolver {
             let tokens = self.tokens.clone();
             let started = self.server_started.clone();
 
+            // Register the listener before spawning so we don't miss the notification
+            let notified = self.server_started.notified();
+
             let handle = tokio::spawn(async move {
                 started.notify_waiters();
                 // Spawn an accept loop for each bound listener
@@ -93,7 +96,7 @@ impl Http01StandaloneSolver {
                 }
             });
 
-            self.server_started.notified().await;
+            notified.await;
 
             Ok::<_, Error>(handle)
         }).await;

src/solver/tls_alpn01.rs

@@ -77,6 +77,9 @@ impl TlsAlpn01Solver {
 
             let acceptor = TlsAcceptor::from(tls_config);
 
+            // Register the listener before spawning so we don't miss the notification
+            let notified = self.server_started.notified();
+
             let handle = tokio::spawn(async move {
                 started.notify_waiters();
                 let mut handles = Vec::new();
@@ -99,7 +102,7 @@ impl TlsAlpn01Solver {
                 }
             });
 
-            self.server_started.notified().await;
+            notified.await;
 
             Ok::<_, Error>(handle)
         }).await;