fix(dev): reject closed gateway websocket calls

scripts/dev/gateway-ws-client.ts

@@ -65,8 +65,20 @@ export function createGatewayWsClient(params: {
     }
   >();
 
+  const rejectPending = (error: Error) => {
+    for (const waiter of pending.values()) {
+      clearTimeout(waiter.timeout);
+      waiter.reject(error);
+    }
+    pending.clear();
+  };
+
   const request = (method: string, paramsObj?: unknown, timeoutMs = 12_000) =>
     new Promise<GatewayResFrame>((resolve, reject) => {
+      if (ws.readyState !== WebSocket.OPEN) {
+        reject(new Error(`gateway websocket is not open for ${method}`));
+        return;
+      }
       const id = randomUUID();
       const frame: GatewayReqFrame = { type: "req", id, method, params: paramsObj };
       const timeout = setTimeout(() => {
@@ -74,7 +86,24 @@ export function createGatewayWsClient(params: {
         reject(new Error(`timeout waiting for ${method}`));
       }, timeoutMs);
       pending.set(id, { resolve, reject, timeout });
-      ws.send(JSON.stringify(frame));
+      try {
+        ws.send(JSON.stringify(frame), (err) => {
+          if (!err) {
+            return;
+          }
+          const waiter = pending.get(id);
+          if (!waiter) {
+            return;
+          }
+          pending.delete(id);
+          clearTimeout(waiter.timeout);
+          waiter.reject(err instanceof Error ? err : new Error(String(err)));
+        });
+      } catch (err) {
+        pending.delete(id);
+        clearTimeout(timeout);
+        reject(err instanceof Error ? err : new Error(String(err)));
+      }
     });
 
   const waitOpen = () =>
@@ -119,12 +148,16 @@ export function createGatewayWsClient(params: {
       params.onEvent?.(evt);
     }
   });
+  ws.on("close", (code, reason) => {
+    const suffix = reason.length > 0 ? `: ${reason.toString("utf8")}` : "";
+    rejectPending(new Error(`gateway websocket closed (${code})${suffix}`));
+  });
+  ws.on("error", (err) => {
+    rejectPending(err instanceof Error ? err : new Error(String(err)));
+  });
 
   const close = () => {
-    for (const waiter of pending.values()) {
-      clearTimeout(waiter.timeout);
-    }
-    pending.clear();
+    rejectPending(new Error("gateway websocket client closed"));
     ws.close();
   };