Use REDIS_URL for share shortlinks.

Stores /s/:code mappings in the connected Redis database and falls back to Vercel KV REST when available.

server/package-lock.json

@@ -13,7 +13,8 @@
         "cors": "^2.8.5",
         "crypto": "^1.0.1",
         "express": "^4.18.2",
-        "midi-writer-js": "^3.1.1"
+        "midi-writer-js": "^3.1.1",
+        "redis": "^5.10.0"
       },
       "devDependencies": {
         "@types/cors": "^2.8.17",
@@ -465,6 +466,66 @@
         "node": ">=18"
       }
     },
+    "node_modules/@redis/bloom": {
+      "version": "5.10.0",
+      "resolved": "https://registry.npmjs.org/@redis/bloom/-/bloom-5.10.0.tgz",
+      "integrity": "sha512-doIF37ob+l47n0rkpRNgU8n4iacBlKM9xLiP1LtTZTvz8TloJB8qx/MgvhMhKdYG+CvCY2aPBnN2706izFn/4A==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 18"
+      },
+      "peerDependencies": {
+        "@redis/client": "^5.10.0"
+      }
+    },
+    "node_modules/@redis/client": {
+      "version": "5.10.0",
+      "resolved": "https://registry.npmjs.org/@redis/client/-/client-5.10.0.tgz",
+      "integrity": "sha512-JXmM4XCoso6C75Mr3lhKA3eNxSzkYi3nCzxDIKY+YOszYsJjuKbFgVtguVPbLMOttN4iu2fXoc2BGhdnYhIOxA==",
+      "license": "MIT",
+      "dependencies": {
+        "cluster-key-slot": "1.1.2"
+      },
+      "engines": {
+        "node": ">= 18"
+      }
+    },
+    "node_modules/@redis/json": {
+      "version": "5.10.0",
+      "resolved": "https://registry.npmjs.org/@redis/json/-/json-5.10.0.tgz",
+      "integrity": "sha512-B2G8XlOmTPUuZtD44EMGbtoepQG34RCDXLZbjrtON1Djet0t5Ri7/YPXvL9aomXqP8lLTreaprtyLKF4tmXEEA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 18"
+      },
+      "peerDependencies": {
+        "@redis/client": "^5.10.0"
+      }
+    },
+    "node_modules/@redis/search": {
+      "version": "5.10.0",
+      "resolved": "https://registry.npmjs.org/@redis/search/-/search-5.10.0.tgz",
+      "integrity": "sha512-3SVcPswoSfp2HnmWbAGUzlbUPn7fOohVu2weUQ0S+EMiQi8jwjL+aN2p6V3TI65eNfVsJ8vyPvqWklm6H6esmg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 18"
+      },
+      "peerDependencies": {
+        "@redis/client": "^5.10.0"
+      }
+    },
+    "node_modules/@redis/time-series": {
+      "version": "5.10.0",
+      "resolved": "https://registry.npmjs.org/@redis/time-series/-/time-series-5.10.0.tgz",
+      "integrity": "sha512-cPkpddXH5kc/SdRhF0YG0qtjL+noqFT0AcHbQ6axhsPsO7iqPi1cjxgdkE9TNeKiBUUdCaU1DbqkR/LzbzPBhg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 18"
+      },
+      "peerDependencies": {
+        "@redis/client": "^5.10.0"
+      }
+    },
     "node_modules/@tonaljs/midi": {
       "version": "4.10.2",
       "resolved": "https://registry.npmjs.org/@tonaljs/midi/-/midi-4.10.2.tgz",
@@ -779,6 +840,15 @@
         "url": "https://github.com/sponsors/fb55"
       }
     },
+    "node_modules/cluster-key-slot": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/cluster-key-slot/-/cluster-key-slot-1.1.2.tgz",
+      "integrity": "sha512-RMr0FhtfXemyinomL4hrWcYJxmX6deFdCxpJzhDttxgO1+bcCnkk+9drydLVDmAMG7NE6aN/fl4F7ucU/90gAA==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/content-disposition": {
       "version": "0.5.4",
       "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.4.tgz",
@@ -1624,6 +1694,22 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/redis": {
+      "version": "5.10.0",
+      "resolved": "https://registry.npmjs.org/redis/-/redis-5.10.0.tgz",
+      "integrity": "sha512-0/Y+7IEiTgVGPrLFKy8oAEArSyEJkU0zvgV5xyi9NzNQ+SLZmyFbUsWIbgPcd4UdUh00opXGKlXJwMmsis5Byw==",
+      "license": "MIT",
+      "dependencies": {
+        "@redis/bloom": "5.10.0",
+        "@redis/client": "5.10.0",
+        "@redis/json": "5.10.0",
+        "@redis/search": "5.10.0",
+        "@redis/time-series": "5.10.0"
+      },
+      "engines": {
+        "node": ">= 18"
+      }
+    },
     "node_modules/resolve-pkg-maps": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/resolve-pkg-maps/-/resolve-pkg-maps-1.0.0.tgz",

server/package.json

@@ -15,7 +15,8 @@
     "cors": "^2.8.5",
     "crypto": "^1.0.1",
     "express": "^4.18.2",
-    "midi-writer-js": "^3.1.1"
+    "midi-writer-js": "^3.1.1",
+    "redis": "^5.10.0"
   },
   "devDependencies": {
     "@types/cors": "^2.8.17",

server/src/server.ts

@@ -2,6 +2,7 @@ import express from 'express';
 import cors from 'cors';
 import crypto from 'node:crypto';
 import { kv } from '@vercel/kv';
+import { createClient } from 'redis';
 import { MIDISearchService } from './services/MIDISearchService.js';
 import { MIDIFetchService } from './services/MIDIFetchService.js';
 import { MIDIParseService } from './services/MIDIParseService.js';
@@ -35,6 +36,28 @@ type SharePayload =
 const localShareStore = new Map<string, SharePayload>();
 const isVercel = Boolean(process.env.VERCEL);
 const hasKvEnv = Boolean(process.env.KV_REST_API_URL && process.env.KV_REST_API_TOKEN);
+const redisUrl = process.env.REDIS_URL;
+const hasRedisEnv = Boolean(redisUrl);
+
+let redisClient: ReturnType<typeof createClient> | null = null;
+let redisConnectPromise: Promise<void> | null = null;
+
+async function getRedis(): Promise<ReturnType<typeof createClient>> {
+  if (!redisUrl) throw new Error('REDIS_URL is not configured for this project.');
+  if (!redisClient) {
+    redisClient = createClient({ url: redisUrl });
+    redisClient.on('error', (err) => console.error('Redis error:', err));
+  }
+  if (!redisClient.isOpen) {
+    if (!redisConnectPromise) {
+      redisConnectPromise = redisClient.connect().then(() => {}).finally(() => {
+        redisConnectPromise = null;
+      });
+    }
+    await redisConnectPromise;
+  }
+  return redisClient;
+}
 
 function base62(bytes: Uint8Array): string {
   const alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
@@ -52,37 +75,44 @@ async function shareSet(code: string, payload: SharePayload): Promise<void> {
   const key = `share:${code}`;
   // 30 days TTL
   const exSec = 60 * 60 * 24 * 30;
-  if (isVercel && !hasKvEnv) {
-    throw new Error('Vercel KV is not configured for this project.');
+  if (isVercel && !hasRedisEnv && !hasKvEnv) {
+    throw new Error('No storage configured (need REDIS_URL or Vercel KV env vars).');
   }
 
-  try {
+  // Prefer Redis integration if present (your project has REDIS_URL).
+  if (hasRedisEnv) {
+    const r = await getRedis();
+    await r.set(key, JSON.stringify(payload), { EX: exSec });
+    return;
+  }
+
+  // Fallback: Vercel KV REST (Upstash)
   if (hasKvEnv) {
     await kv.set(key, payload, { ex: exSec });
     return;
   }
-  } catch {
-    // fall through to local store (dev only)
-  }
 
-  // Local dev: best-effort in-memory store.
+  // Local dev only: best-effort in-memory store.
   localShareStore.set(code, payload);
 }
 
 async function shareGet(code: string): Promise<SharePayload | null> {
   const key = `share:${code}`;
-  if (isVercel && !hasKvEnv) {
-    throw new Error('Vercel KV is not configured for this project.');
+  if (isVercel && !hasRedisEnv && !hasKvEnv) {
+    throw new Error('No storage configured (need REDIS_URL or Vercel KV env vars).');
+  }
+
+  if (hasRedisEnv) {
+    const r = await getRedis();
+    const val = await r.get(key);
+    if (!val) return null;
+    return JSON.parse(val) as SharePayload;
   }
 
-  try {
   if (hasKvEnv) {
     const val = await kv.get<SharePayload>(key);
     return val ?? null;
   }
-  } catch {
-    // fall through to local store (dev only)
-  }
 
   return localShareStore.get(code) ?? null;
 }