@n8n/n8n-nodes-langchain
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269 lines • 12.6 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.LmChatOpenRouter = void 0;
const openai_1 = require("@langchain/openai");
const ai_utilities_1 = require("@n8n/ai-utilities");
const n8n_workflow_1 = require("n8n-workflow");
const error_handling_1 = require("../../vendors/OpenAi/helpers/error-handling");
function isOpenAIResponseWithChoices(json) {
return (typeof json === 'object' &&
json !== null &&
'choices' in json &&
Array.isArray(json.choices));
}
function createOpenRouterFetch(baseFetch) {
return async (input, init) => {
const response = await baseFetch(input, init);
const contentType = response.headers.get('content-type') ?? '';
if (!contentType.includes('json'))
return response;
const clone = response.clone();
const json = await response.json();
if (!isOpenAIResponseWithChoices(json))
return clone;
const isInvalidArgs = (args) => typeof args !== 'string' || !args.trim();
const toolCallsToFix = json.choices
.flatMap((choice) => choice.message?.tool_calls ?? [])
.filter((tc) => tc.function && isInvalidArgs(tc.function.arguments));
if (toolCallsToFix.length === 0)
return clone;
for (const tc of toolCallsToFix) {
if (!tc.function)
continue;
const { arguments: args } = tc.function;
const isPlainObject = typeof args === 'object' && args !== null && !Array.isArray(args);
tc.function.arguments = isPlainObject ? JSON.stringify(args) : '{}';
}
const body = JSON.stringify(json);
return new Response(body, {
status: response.status,
statusText: response.statusText,
headers: { 'content-type': contentType },
});
};
}
class LmChatOpenRouter {
constructor() {
this.description = {
displayName: 'OpenRouter Chat Model',
name: 'lmChatOpenRouter',
icon: { light: 'file:openrouter.svg', dark: 'file:openrouter.dark.svg' },
group: ['transform'],
version: [1],
description: 'For advanced usage with an AI chain',
defaults: {
name: 'OpenRouter 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.lmchatopenrouter/',
},
],
},
},
inputs: [],
outputs: [n8n_workflow_1.NodeConnectionTypes.AiLanguageModel],
outputNames: ['Model'],
credentials: [
{
name: 'openRouterApi',
required: true,
},
],
requestDefaults: {
ignoreHttpStatusErrors: true,
baseURL: '={{ $credentials?.url }}',
},
properties: [
(0, ai_utilities_1.getConnectionHintNoticeField)([n8n_workflow_1.NodeConnectionTypes.AiChain, n8n_workflow_1.NodeConnectionTypes.AiAgent]),
{
displayName: 'If using JSON response format, you must include word "json" in the prompt in your chain or agent. Also, make sure to select latest models released post November 2023.',
name: 'notice',
type: 'notice',
default: '',
displayOptions: {
show: {
'/options.responseFormat': ['json_object'],
},
},
},
{
displayName: 'Model',
name: 'model',
type: 'options',
description: 'The model which will generate the completion. <a href="https://openrouter.ai/docs/models">Learn more</a>.',
typeOptions: {
loadOptions: {
routing: {
request: {
method: 'GET',
url: '/models',
},
output: {
postReceive: [
{
type: 'rootProperty',
properties: {
property: 'data',
},
},
{
type: 'setKeyValue',
properties: {
name: '={{$responseItem.id}}',
value: '={{$responseItem.id}}',
},
},
{
type: 'sort',
properties: {
key: 'name',
},
},
],
},
},
},
},
routing: {
send: {
type: 'body',
property: 'model',
},
},
default: 'openai/gpt-4.1-mini',
builderHint: {
message: 'Default to a current flagship (e.g. openai/gpt-5.4, anthropic/claude-sonnet-4.6, google/gemini-3.1-pro-preview). Avoid openai/gpt-4o, anthropic/claude-3.x, and other pre-2026 models.',
},
},
{
displayName: 'Options',
name: 'options',
placeholder: 'Add Option',
description: 'Additional options to add',
type: 'collection',
default: {},
options: [
{
displayName: 'Frequency Penalty',
name: 'frequencyPenalty',
default: 0,
typeOptions: { maxValue: 2, minValue: -2, numberPrecision: 1 },
description: "Positive values penalize new tokens based on their existing frequency in the text so far, decreasing the model's likelihood to repeat the same line verbatim",
type: 'number',
},
{
displayName: 'Maximum Number of Tokens',
name: 'maxTokens',
default: -1,
description: 'The maximum number of tokens to generate in the completion. Most models have a context length of 2048 tokens (except for the newest models, which support 32,768).',
type: 'number',
typeOptions: {
maxValue: 32768,
},
},
{
displayName: 'Response Format',
name: 'responseFormat',
default: 'text',
type: 'options',
options: [
{
name: 'Text',
value: 'text',
description: 'Regular text response',
},
{
name: 'JSON',
value: 'json_object',
description: 'Enables JSON mode, which should guarantee the message the model generates is valid JSON',
},
],
},
{
displayName: 'Presence Penalty',
name: 'presencePenalty',
default: 0,
typeOptions: { maxValue: 2, minValue: -2, numberPrecision: 1 },
description: "Positive values penalize new tokens based on whether they appear in the text so far, increasing the model's likelihood to talk about new topics",
type: 'number',
},
{
displayName: 'Sampling Temperature',
name: 'temperature',
default: 0.7,
typeOptions: { maxValue: 2, minValue: 0, numberPrecision: 1 },
description: 'Controls randomness: Lowering results in less random completions. As the temperature approaches zero, the model will become deterministic and repetitive.',
type: 'number',
},
{
displayName: 'Timeout',
name: 'timeout',
default: 360000,
description: 'Maximum amount of time a request is allowed to take in milliseconds',
type: 'number',
},
{
displayName: 'Max Retries',
name: 'maxRetries',
default: 2,
description: 'Maximum number of retries to attempt',
type: 'number',
},
{
displayName: 'Top P',
name: 'topP',
default: 1,
typeOptions: { maxValue: 1, minValue: 0, numberPrecision: 1 },
description: 'Controls diversity via nucleus sampling: 0.5 means half of all likelihood-weighted options are considered. We generally recommend altering this or temperature but not both.',
type: 'number',
},
],
},
],
};
}
async supplyData(itemIndex) {
const credentials = await this.getCredentials('openRouterApi');
const modelName = this.getNodeParameter('model', itemIndex);
const options = this.getNodeParameter('options', itemIndex, {});
const timeout = options.timeout;
const configuration = {
baseURL: credentials.url,
fetch: createOpenRouterFetch(globalThis.fetch),
fetchOptions: {
dispatcher: (0, ai_utilities_1.getProxyAgent)(credentials.url, {
headersTimeout: timeout,
bodyTimeout: timeout,
}),
},
};
const model = new openai_1.ChatOpenAI({
apiKey: credentials.apiKey,
model: modelName,
...options,
timeout,
maxRetries: options.maxRetries ?? 2,
configuration,
callbacks: [new ai_utilities_1.N8nLlmTracing(this)],
modelKwargs: options.responseFormat
? {
response_format: { type: options.responseFormat },
}
: undefined,
onFailedAttempt: (0, ai_utilities_1.makeN8nLlmFailedAttemptHandler)(this, error_handling_1.openAiFailedAttemptHandler),
});
return {
response: model,
};
}
}
exports.LmChatOpenRouter = LmChatOpenRouter;
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