From f8232bd20165a6bfcf3bfdb393e5422ec1f9360d Mon Sep 17 00:00:00 2001
From: chungyau97 <chungyau97@gmail.com>
Date: Tue, 23 May 2023 21:34:37 +0700
Subject: [PATCH] add Buffer Window Memory

---
 .../BufferWindowMemory/BufferWindowMemory.ts  | 61 +++++++++++++++++++
 .../memory/BufferWindowMemory/memory.svg      |  8 +++
 2 files changed, 69 insertions(+)
 create mode 100644 packages/components/nodes/memory/BufferWindowMemory/BufferWindowMemory.ts
 create mode 100644 packages/components/nodes/memory/BufferWindowMemory/memory.svg

diff --git a/packages/components/nodes/memory/BufferWindowMemory/BufferWindowMemory.ts b/packages/components/nodes/memory/BufferWindowMemory/BufferWindowMemory.ts
new file mode 100644
index 00000000..0f6a9542
--- /dev/null
+++ b/packages/components/nodes/memory/BufferWindowMemory/BufferWindowMemory.ts
@@ -0,0 +1,61 @@
+import { INode, INodeData, INodeParams } from '../../../src/Interface'
+import { getBaseClasses } from '../../../src/utils'
+import { BufferWindowMemory, BufferWindowMemoryInput } from 'langchain/memory'
+
+class BufferWindowMemory_Memory implements INode {
+    label: string
+    name: string
+    description: string
+    type: string
+    icon: string
+    category: string
+    baseClasses: string[]
+    inputs: INodeParams[]
+
+    constructor() {
+        this.label = 'Buffer Window Memory'
+        this.name = 'bufferWindowMemory'
+        this.type = 'BufferWindowMemory'
+        this.icon = 'memory.svg'
+        this.category = 'Memory'
+        this.description = 'Uses a window of size k to surface the last k back-and-forths to use as memory'
+        this.baseClasses = [this.type, ...getBaseClasses(BufferWindowMemory)]
+        this.inputs = [
+            {
+                label: 'Memory Key',
+                name: 'memoryKey',
+                type: 'string',
+                default: 'chat_history'
+            },
+            {
+                label: 'Input Key',
+                name: 'inputKey',
+                type: 'string',
+                default: 'input'
+            },
+            {
+                label: 'Size',
+                name: 'k',
+                type: 'number',
+                default: '4'
+            }
+        ]
+    }
+
+    async init(nodeData: INodeData): Promise<any> {
+        const memoryKey = nodeData.inputs?.memoryKey as string
+        const inputKey = nodeData.inputs?.inputKey as string
+        const k = nodeData.inputs?.k as string
+
+        const obj: Partial<BufferWindowMemoryInput> = {
+            returnMessages: true,
+            memoryKey: memoryKey,
+            inputKey: inputKey,
+            k: parseInt(k, 10)
+        }
+
+        return new BufferWindowMemory(obj)
+    }
+}
+
+module.exports = { nodeClass: BufferWindowMemory_Memory }
diff --git a/packages/components/nodes/memory/BufferWindowMemory/memory.svg b/packages/components/nodes/memory/BufferWindowMemory/memory.svg
new file mode 100644
index 00000000..ca8e17da
--- /dev/null
+++ b/packages/components/nodes/memory/BufferWindowMemory/memory.svg
@@ -0,0 +1,8 @@
+<svg xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-book" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
+   <path stroke="none" d="M0 0h24v24H0z" fill="none"></path>
+   <path d="M3 19a9 9 0 0 1 9 0a9 9 0 0 1 9 0"></path>
+   <path d="M3 6a9 9 0 0 1 9 0a9 9 0 0 1 9 0"></path>
+   <path d="M3 6l0 13"></path>
+   <path d="M12 6l0 13"></path>
+   <path d="M21 6l0 13"></path>
+</svg>
\ No newline at end of file