From e0402ded7ffd556fcfd73ae8a685e0fe9e264807 Mon Sep 17 00:00:00 2001
From: Brandon Liu <bdon@bdon.org>
Date: Wed, 20 Jul 2022 13:07:02 +0800
Subject: [PATCH] cloudflare worker: cache holds promises instead of buffers

---
 serverless/cloudflare/worker.ts | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/serverless/cloudflare/worker.ts b/serverless/cloudflare/worker.ts
index 5eeb44a..3eb2b1f 100644
--- a/serverless/cloudflare/worker.ts
+++ b/serverless/cloudflare/worker.ts
@@ -7,7 +7,7 @@ interface Env {
 
 interface CacheEntry {
   lastUsed: number;
-  buffer: DataView;
+  buffer: Promise<ArrayBuffer>;
 }
 
 export class LRUCache {
@@ -29,18 +29,17 @@ export class LRUCache {
     let val = this.entries.get(cacheKey);
     if (val) {
       val.lastUsed = this.counter++;
-      return [true, val.buffer];
+      return [true, new DataView(await val.buffer)];
     }
 
     let resp = await bucket.get(key, {
       range: { offset: offset, length: length },
     });
-    let a = await (resp as R2ObjectBody).arrayBuffer();
-    let d = new DataView(a);
+    let a = (resp as R2ObjectBody).arrayBuffer();
 
     this.entries.set(cacheKey, {
       lastUsed: this.counter++,
-      buffer: d,
+      buffer: a,
     });
     if (this.entries.size > 128) {
       let minUsed = Infinity;
@@ -54,7 +53,7 @@ export class LRUCache {
       if (minKey) this.entries.delete(minKey);
     }
 
-    return [false, d];
+    return [false, new DataView(await a)];
   }
 }