fix(redis): improve cache reliability and health monitoring

Author: rajputomsingh

app/api/health/redis/route.ts

@@ -1,16 +1,102 @@
 // app/api/health/redis/route.ts
-import { NextResponse } from "next/server";
-import { redis } from "@/lib/redis";
+import { NextResponse } from 'next/server';
+import { redis, getHealth } from '@/lib/redis';
+
+export const dynamic = 'force-dynamic';
 
 export async function GET() {
+  const health = getHealth();
+
+  // If Redis isn't initialized, return immediately
   if (!redis) {
-    return NextResponse.json({ status: "Redis not configured" }, { status: 503 });
+    return NextResponse.json(
+      {
+        status: 'unavailable',
+        initialized: false,
+        error: 'Redis client not initialized',
+        timestamp: new Date().toISOString(),
+      },
+      { status: 503 }
+    );
+  }
+
+  // If circuit breaker is open, don't attempt ping
+  if (health.circuitBreakerOpen) {
+    return NextResponse.json(
+      {
+        status: 'unhealthy',
+        connected: false,
+        error: 'Circuit breaker is open',
+        ...health,
+        timestamp: new Date().toISOString(),
+      },
+      { status: 503 }
+    );
   }
 
+  // Perform real connectivity check
+  const startTime = Date.now();
+
   try {
-    await redis.ping();
-    return NextResponse.json({ status: "healthy", timestamp: new Date().toISOString() });
+    const pingResult = await Promise.race([
+      redis.ping(),
+      new Promise<null>((_, reject) =>
+        setTimeout(
+          () => reject(new Error('Ping timed out after 3s')),
+          3000
+        )
+      ),
+    ]);
+
+    const latency = Date.now() - startTime;
+
+    if (pingResult === 'PONG') {
+      return NextResponse.json(
+        {
+          status: 'healthy',
+          connected: true,
+          latency,
+          ...health,
+          timestamp: new Date().toISOString(),
+        },
+        { status: 200 }
+      );
+    }
+
+    return NextResponse.json(
+      {
+        status: 'degraded',
+        connected: false,
+        latency,
+        error: `Unexpected ping response: ${typeof pingResult}`,
+        ...health,
+        timestamp: new Date().toISOString(),
+      },
+      { status: 503 }
+    );
   } catch (error) {
-    return NextResponse.json({ status: "unhealthy", error: String(error) }, { status: 503 });
+    const latency = Date.now() - startTime;
+    const errorMessage = error instanceof Error ? error.message : 'Unknown error';
+
+    let status: string = 'unhealthy';
+    let diagnostic = errorMessage;
+
+    if (errorMessage.includes('ENOTFOUND') || errorMessage.includes('getaddrinfo')) {
+      diagnostic = `DNS resolution failed: ${errorMessage}`;
+    } else if (errorMessage.includes('timed out')) {
+      status = 'degraded';
+    }
+
+    return NextResponse.json(
+      {
+        status,
+        connected: false,
+        latency,
+        error: diagnostic,
+        ...health,
+        timestamp: new Date().toISOString(),
+      },
+      { status: 503 }
+    );
   }
 }