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feat(Postgres Chat Memory Node): Implement Postgres Chat Memory node (#10071)

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This commit is contained in:
oleg
2024-07-17 08:25:37 +02:00
committed by GitHub
parent e5dda5731d
commit 9cbbb6335d
6 changed files with 200 additions and 6 deletions
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22
packages/@n8n/nodes-langchain/utils/helpers.ts
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@@ -10,6 +10,18 @@ import type { BaseOutputParser } from '@langchain/core/output_parsers';
import type { BaseMessage } from '@langchain/core/messages';
import { DynamicTool, type Tool } from '@langchain/core/tools';
import type { BaseLLM } from '@langchain/core/language_models/llms';
import type { BaseChatMemory } from 'langchain/memory';
import type { BaseChatMessageHistory } from '@langchain/core/chat_history';
function hasMethods<T>(obj: unknown, ...methodNames: Array<string | symbol>): obj is T {
return methodNames.every(
(methodName) =>
typeof obj === 'object' &&
obj !== null &&
methodName in obj &&
typeof (obj as Record<string | symbol, unknown>)[methodName] === 'function',
);
}
export function getMetadataFiltersValues(
ctx: IExecuteFunctions,
@@ -38,8 +50,16 @@ export function getMetadataFiltersValues(
return undefined;
}
export function isBaseChatMemory(obj: unknown) {
return hasMethods<BaseChatMemory>(obj, 'loadMemoryVariables', 'saveContext');
}
export function isBaseChatMessageHistory(obj: unknown) {
return hasMethods<BaseChatMessageHistory>(obj, 'getMessages', 'addMessage');
}
export function isChatInstance(model: unknown): model is BaseChatModel {
const namespace = (model as BaseLLM | BaseChatModel)?.lc_namespace ?? [];
const namespace = (model as BaseLLM)?.lc_namespace ?? [];
return namespace.includes('chat_models');
}