@n8n/n8n-nodes-langchain
Version:
203 lines • 9.38 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.LmChatGoogleVertex = void 0;
const resource_manager_1 = require("@google-cloud/resource-manager");
const google_vertexai_1 = require("@langchain/google-vertexai");
const ai_utilities_1 = require("@n8n/ai-utilities");
const format_pem_block_1 = require("@n8n/utils/format-pem-block");
const n8n_workflow_1 = require("n8n-workflow");
const error_handling_1 = require("./error-handling");
const additional_options_1 = require("../gemini-common/additional-options");
const vertex_location_1 = require("../gemini-common/vertex-location");
function errorDescriptionMapper(error) {
if (error.description?.includes('properties: should be non-empty for OBJECT type')) {
return 'Google Vertex requires at least one <a href="https://docs.n8n.io/advanced-ai/examples/using-the-fromai-function/" target="_blank">dynamic parameter</a> when using tools';
}
return error.description ?? 'Unknown error';
}
class LmChatGoogleVertex {
constructor() {
this.description = {
displayName: 'Google Vertex Chat Model',
name: 'lmChatGoogleVertex',
icon: 'file:google.svg',
group: ['transform'],
version: 1,
description: 'Chat Model Google Vertex',
defaults: {
name: 'Google Vertex Chat Model',
},
codex: {
categories: ['AI'],
subcategories: {
AI: ['Language Models', 'Root Nodes'],
'Language Models': ['Chat Models (Recommended)'],
},
resources: {
primaryDocumentation: [
{
url: 'https://docs.n8n.io/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.lmchatgooglevertex/',
},
],
},
},
inputs: [],
outputs: [n8n_workflow_1.NodeConnectionTypes.AiLanguageModel],
outputNames: ['Model'],
credentials: [
{
name: 'googleApi',
required: true,
},
],
properties: [
(0, ai_utilities_1.getConnectionHintNoticeField)([n8n_workflow_1.NodeConnectionTypes.AiChain, n8n_workflow_1.NodeConnectionTypes.AiAgent]),
{
displayName: 'Project ID',
name: 'projectId',
type: 'resourceLocator',
default: { mode: 'list', value: '' },
required: true,
description: 'Select or enter your Google Cloud project ID',
modes: [
{
displayName: 'From List',
name: 'list',
type: 'list',
typeOptions: {
searchListMethod: 'gcpProjectsList',
},
},
{
displayName: 'ID',
name: 'id',
type: 'string',
},
],
},
{
displayName: 'Model Name',
name: 'modelName',
type: 'string',
description: 'The model which will generate the completion. <a href="https://cloud.google.com/vertex-ai/generative-ai/docs/learn/models">Learn more</a>.',
default: 'gemini-2.5-flash',
builderHint: {
propertyHint: 'Default to the latest flagship Gemini on Vertex (gemini-3.1-pro). Use gemini-3.1-flash-lite for cost-efficient builds. Avoid Gemini 2.x, 1.x, and earlier.',
},
},
vertex_location_1.vertexLocationField,
(0, additional_options_1.getAdditionalOptions)({ supportsThinkingBudget: true }),
],
};
this.methods = {
listSearch: {
async gcpProjectsList() {
const results = [];
const credentials = await this.getCredentials('googleApi');
const privateKey = (0, format_pem_block_1.formatPemBlock)(credentials.privateKey);
const email = credentials.email.trim();
const client = new resource_manager_1.ProjectsClient({
credentials: {
client_email: email,
private_key: privateKey,
},
});
const [projects] = await client.searchProjects();
for (const project of projects) {
if (project.projectId) {
results.push({
name: project.displayName ?? project.projectId,
value: project.projectId,
});
}
}
return { results };
},
},
};
}
async supplyData(itemIndex) {
const credentials = await this.getCredentials('googleApi');
const privateKey = (0, format_pem_block_1.formatPemBlock)(credentials.privateKey);
const email = credentials.email.trim();
const locationOverride = this.getNodeParameter('location', itemIndex, '');
const location = (0, vertex_location_1.resolveVertexLocation)(locationOverride, credentials.region);
const endpoint = (0, vertex_location_1.getVertexEndpoint)(location);
const modelName = this.getNodeParameter('modelName', itemIndex);
const projectId = this.getNodeParameter('projectId', itemIndex, '', {
extractValue: true,
});
const options = this.getNodeParameter('options', itemIndex, {
maxOutputTokens: 2048,
temperature: 0.4,
topK: 40,
topP: 0.9,
});
(0, n8n_workflow_1.validateNodeParameters)(options, {
maxOutputTokens: { type: 'number', required: false },
temperature: { type: 'number', required: false },
topK: { type: 'number', required: false },
topP: { type: 'number', required: false },
thinkingBudget: { type: 'number', required: false },
}, this.getNode());
const safetySettings = this.getNodeParameter('options.safetySettings.values', itemIndex, null);
try {
const modelConfig = {
authOptions: {
projectId,
credentials: {
client_email: email,
private_key: privateKey,
},
},
location,
...(endpoint ? { endpoint } : {}),
model: modelName,
topK: options.topK,
topP: options.topP,
temperature: options.temperature,
maxOutputTokens: options.maxOutputTokens,
safetySettings,
callbacks: [new ai_utilities_1.N8nLlmTracing(this, { errorDescriptionMapper })],
onFailedAttempt: (0, ai_utilities_1.makeN8nLlmFailedAttemptHandler)(this, (error) => {
const status = Number(error?.response?.status);
const customError = (0, error_handling_1.makeErrorFromStatus)(status, {
modelName,
});
if (customError) {
throw new n8n_workflow_1.NodeOperationError(this.getNode(), error, customError);
}
if (status === 400) {
throw new n8n_workflow_1.NodeOperationError(this.getNode(), error, {
message: 'Bad request - please check your parameters',
description: (0, error_handling_1.extractGoogleErrorMessage)(error) ??
(typeof error?.message === 'string' ? error.message : undefined),
});
}
throw error;
}),
};
if (options.thinkingBudget !== undefined) {
modelConfig.thinkingBudget = options.thinkingBudget;
}
const model = new google_vertexai_1.ChatVertexAI(modelConfig);
return {
response: model,
};
}
catch (e) {
if (e?.message?.startsWith('Unable to verify model params')) {
throw new n8n_workflow_1.NodeOperationError(this.getNode(), e, {
message: 'Unsupported model',
description: "Only models starting with 'gemini' are supported.",
});
}
throw new n8n_workflow_1.NodeOperationError(this.getNode(), e, {
message: 'Invalid options',
description: e.message,
});
}
}
}
exports.LmChatGoogleVertex = LmChatGoogleVertex;
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