fix(ci): rename otelrecv→otel-receiver, fix teardown hang

Rename ci/otelrecv.py to ci/otel-receiver.py for readability.

Replace SIGTERM+wait shutdown (which could hang indefinitely) with an
HTTP-based approach: add GET /shutdown to otel-receiver.py that calls
self.server.shutdown() directly. After dagger call returns, curl that
endpoint so the receiver prints its timing report and exits cleanly.
Cleanup is reduced to a SIGKILL fallback in case the process is already
gone.

Also fix the do_GET handler to reference self.server instead of the
local variable server, which was inaccessible from the handler class.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Taskfile.yml

@@ -291,12 +291,10 @@ tasks:
           exit $RC
         fi
         PORTFILE=$(mktemp)
-        python3 ci/otelrecv.py --port-file="$PORTFILE" &
+        python3 ci/otel-receiver.py --port-file="$PORTFILE" &
         RECV_PID=$!
         cleanup() {
-          kill "$RECV_PID" 2>/dev/null
-          wait "$RECV_PID" 2>/dev/null || true
-          pkill -9 -f "otelrecv.py" 2>/dev/null || true
+          kill -9 "$RECV_PID" 2>/dev/null || true
           rm -f "$PORTFILE" "$DAGGER_OUT" "$RC_FILE"
         }
         trap cleanup EXIT
@@ -307,6 +305,8 @@ tasks:
           OTEL_EXPORTER_OTLP_PROTOCOL="http/protobuf" \
           dagger call --progress=plain -q -m ci --source=. check
         RC=$?
+        curl -sf "http://127.0.0.1:$PORT/shutdown" >/dev/null 2>&1 || true
+        wait "$RECV_PID" 2>/dev/null || true
         exit $RC
 
   integration-android:

ci/otel-receiver.py

@@ -3,7 +3,7 @@
 Minimal OTLP HTTP/protobuf trace receiver for Dagger CI timing.
 
 Usage:
-    python3 ci/otelrecv.py --port-file=/tmp/otel.port
+    python3 ci/otel-receiver.py --port-file=/tmp/otel.port
 
 Caller sets:
     OTEL_EXPORTER_OTLP_ENDPOINT=http://127.0.0.1:<port>
@@ -127,6 +127,12 @@ class _Handler(BaseHTTPRequestHandler):
         if body:
             self.wfile.write(body)
 
+    def do_GET(self):
+        if self.path != "/shutdown":
+            self._respond(404); return
+        self._respond(200, b"shutting down")
+        threading.Thread(target=self.server.shutdown, daemon=True).start()
+
     def do_POST(self):
         if self.path != "/v1/traces":
             self._respond(404); return
@@ -135,7 +141,7 @@ class _Handler(BaseHTTPRequestHandler):
         try:
             decoded = _decode(body)
         except Exception as exc:
-            print(f"[otelrecv] decode error: {exc}", file=sys.stderr, flush=True)
+            print(f"[otel-receiver] decode error: {exc}", file=sys.stderr, flush=True)
             self._respond(400, str(exc).encode()); return
         with _lock:
             _spans.extend(decoded)
@@ -150,7 +156,7 @@ class _Handler(BaseHTTPRequestHandler):
 def _report():
     with _lock:
         if not _spans:
-            print("otelrecv: no spans received", file=sys.stderr)
+            print("otel-receiver: no spans received", file=sys.stderr)
             return
         rows = sorted(_spans, key=lambda r: r["dur"], reverse=True)
         NAME_W = 38
@@ -181,9 +187,7 @@ def main():
     signal.signal(signal.SIGTERM, _shutdown)
     signal.signal(signal.SIGINT, _shutdown)
 
-    print(f"[otelrecv] listening on port {server.server_address[1]}", file=sys.stderr, flush=True)
     server.serve_forever()
-    print("[otelrecv] server stopped, printing report", file=sys.stderr, flush=True)
     _report()