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feat: Add fallback mechanism for agent and basic chain llm (#16617)

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This commit is contained in:
Benjamin Schroth
2025-06-26 16:14:03 +02:00
committed by GitHub
parent 0b7bca29f8
commit 6408d5a1b0
20 changed files with 476 additions and 140 deletions
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38
packages/@n8n/nodes-langchain/nodes/chains/ChainLLM/test/ChainLlm.node.test.ts
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@@ -36,6 +36,7 @@ jest.mock('../methods/responseFormatter', () => ({
describe('ChainLlm Node', () => {
let node: ChainLlm;
let mockExecuteFunction: jest.Mocked<IExecuteFunctions>;
let needsFallback: boolean;
beforeEach(() => {
node = new ChainLlm();
@@ -48,6 +49,8 @@ describe('ChainLlm Node', () => {
error: jest.fn(),
};
needsFallback = false;
mockExecuteFunction.getInputData.mockReturnValue([{ json: {} }]);
mockExecuteFunction.getNode.mockReturnValue({
name: 'Chain LLM',
@@ -57,6 +60,7 @@ describe('ChainLlm Node', () => {
mockExecuteFunction.getNodeParameter.mockImplementation((param, _itemIndex, defaultValue) => {
if (param === 'messages.messageValues') return [];
if (param === 'needsFallback') return needsFallback;
return defaultValue;
});
@@ -96,6 +100,7 @@ describe('ChainLlm Node', () => {
context: mockExecuteFunction,
itemIndex: 0,
query: 'Test prompt',
fallbackLlm: null,
llm: expect.any(FakeChatModel),
outputParser: undefined,
messages: [],
@@ -151,6 +156,7 @@ describe('ChainLlm Node', () => {
context: mockExecuteFunction,
itemIndex: 0,
query: 'Old version prompt',
fallbackLlm: null,
llm: expect.any(Object),
outputParser: undefined,
messages: expect.any(Array),
@@ -505,6 +511,35 @@ describe('ChainLlm Node', () => {
expect(responseFormatterModule.formatResponse).toHaveBeenCalledWith(markdownResponse, true);
});
it('should use fallback llm if enabled', async () => {
needsFallback = true;
(helperModule.getPromptInputByType as jest.Mock).mockReturnValue('Test prompt');
(outputParserModule.getOptionalOutputParser as jest.Mock).mockResolvedValue(undefined);
(executeChainModule.executeChain as jest.Mock).mockResolvedValue(['Test response']);
const fakeLLM = new FakeChatModel({});
const fakeFallbackLLM = new FakeChatModel({});
mockExecuteFunction.getInputConnectionData.mockResolvedValue([fakeLLM, fakeFallbackLLM]);
const result = await node.execute.call(mockExecuteFunction);
expect(executeChainModule.executeChain).toHaveBeenCalledWith({
context: mockExecuteFunction,
itemIndex: 0,
query: 'Test prompt',
fallbackLlm: expect.any(FakeChatModel),
llm: expect.any(FakeChatModel),
outputParser: undefined,
messages: [],
});
expect(mockExecuteFunction.logger.debug).toHaveBeenCalledWith('Executing Basic LLM Chain');
expect(result).toEqual([[{ json: expect.any(Object) }]]);
});
it('should pass correct itemIndex to getOptionalOutputParser', async () => {
// Clear any previous calls to the mock
(outputParserModule.getOptionalOutputParser as jest.Mock).mockClear();
@@ -568,6 +603,7 @@ describe('ChainLlm Node', () => {
itemIndex: 0,
query: 'Test prompt 1',
llm: expect.any(Object),
fallbackLlm: null,
outputParser: mockParser1,
messages: [],
});
@@ -576,6 +612,7 @@ describe('ChainLlm Node', () => {
itemIndex: 1,
query: 'Test prompt 2',
llm: expect.any(Object),
fallbackLlm: null,
outputParser: mockParser2,
messages: [],
});
@@ -584,6 +621,7 @@ describe('ChainLlm Node', () => {
itemIndex: 2,
query: 'Test prompt 3',
llm: expect.any(Object),
fallbackLlm: null,
outputParser: mockParser3,
messages: [],
});