feat: add many bps

src/Memorizer.ts

@@ -0,0 +1,38 @@
+import { Client } from '@smithy/smithy-client'
+import shajs from 'sha.js'
+
+export class Memorizer {
+  private static memorized = new Map<string, Memorizer>()
+
+  public static memo (client: Client<any, any, any, any>) {
+    const memorized = this.memorized.get(client.constructor.name)
+
+    if (memorized !== undefined)
+      return memorized
+
+    const newMemo = new Memorizer(client)
+    this.memorized.set(client.constructor.name, newMemo)
+
+    return newMemo
+  }
+
+  private memorized = new Map<string, any>()
+
+  private constructor (
+    private client: Client<any, any, any, any>
+  ) {}
+
+  public readonly send: typeof this.client.send = async (command) => {
+    const serialized = JSON.stringify([command.constructor.name, command.input])
+    const hashed = shajs('sha256').update(serialized).digest('hex')
+
+    const memorized = this.memorized.get(hashed)
+    if (memorized !== undefined)
+      return memorized
+
+    const newMemo = await this.client.send(command)
+    this.memorized.set(hashed, newMemo)
+
+    return newMemo
+  }
+}