Feature/Add prepend messages to memory (#2410)

add prepend messages to memory

packages/components/nodes/memory/ZepMemory/ZepMemory.ts

@@ -2,7 +2,13 @@ import { ZepMemory, ZepMemoryInput } from '@langchain/community/memory/zep'
 import { BaseMessage } from '@langchain/core/messages'
 import { InputValues, MemoryVariables, OutputValues } from 'langchain/memory'
 import { IMessage, INode, INodeData, INodeParams, MemoryMethods, MessageType, ICommonObject } from '../../../src/Interface'
-import { convertBaseMessagetoIMessage, getBaseClasses, getCredentialData, getCredentialParam } from '../../../src/utils'
+import {
+    convertBaseMessagetoIMessage,
+    getBaseClasses,
+    getCredentialData,
+    getCredentialParam,
+    mapChatMessageToBaseMessage
+} from '../../../src/utils'
 
 class ZepMemory_Memory implements INode {
     label: string
@@ -161,10 +167,17 @@ class ZepMemoryExtended extends ZepMemory implements MemoryMethods {
         return super.clear()
     }
 
-    async getChatMessages(overrideSessionId = '', returnBaseMessages = false): Promise<IMessage[] | BaseMessage[]> {
+    async getChatMessages(
+        overrideSessionId = '',
+        returnBaseMessages = false,
+        prependMessages?: IMessage[]
+    ): Promise<IMessage[] | BaseMessage[]> {
         const id = overrideSessionId ? overrideSessionId : this.sessionId
         const memoryVariables = await this.loadMemoryVariables({}, id)
         const baseMessages = memoryVariables[this.memoryKey]
+        if (prependMessages?.length) {
+            baseMessages.unshift(...mapChatMessageToBaseMessage(prependMessages))
+        }
         return returnBaseMessages ? baseMessages : convertBaseMessagetoIMessage(baseMessages)
     }