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const express = require('express');
const fetch = require('node-fetch').default;
const fs = require('fs');
const { jsonParser, urlencodedParser } = require('../../express-common');
const { forwardFetchResponse, delay } = require('../../util');
const { getOverrideHeaders, setAdditionalHeaders, setAdditionalHeadersByType } = require('../../additional-headers');
const { TEXTGEN_TYPES } = require('../../constants');
const router = express.Router();
router.post('/generate', jsonParser, async function (request, response_generate) {
if (!request.body) return response_generate.sendStatus(400);
if (request.body.api_server.indexOf('localhost') != -1) {
request.body.api_server = request.body.api_server.replace('localhost', '127.0.0.1');
}
const request_prompt = request.body.prompt;
const controller = new AbortController();
request.socket.removeAllListeners('close');
request.socket.on('close', async function () {
if (request.body.can_abort && !response_generate.writableEnded) {
try {
console.log('Aborting Kobold generation...');
// send abort signal to koboldcpp
const abortResponse = await fetch(`${request.body.api_server}/extra/abort`, {
method: 'POST',
});
if (!abortResponse.ok) {
console.log('Error sending abort request to Kobold:', abortResponse.status);
}
} catch (error) {
console.log(error);
}
}
controller.abort();
});
let this_settings = {
prompt: request_prompt,
use_story: false,
use_memory: false,
use_authors_note: false,
use_world_info: false,
max_context_length: request.body.max_context_length,
max_length: request.body.max_length,
};
if (!request.body.gui_settings) {
this_settings = {
prompt: request_prompt,
use_story: false,
use_memory: false,
use_authors_note: false,
use_world_info: false,
max_context_length: request.body.max_context_length,
max_length: request.body.max_length,
rep_pen: request.body.rep_pen,
rep_pen_range: request.body.rep_pen_range,
rep_pen_slope: request.body.rep_pen_slope,
temperature: request.body.temperature,
tfs: request.body.tfs,
top_a: request.body.top_a,
top_k: request.body.top_k,
top_p: request.body.top_p,
min_p: request.body.min_p,
typical: request.body.typical,
sampler_order: request.body.sampler_order,
singleline: !!request.body.singleline,
use_default_badwordsids: request.body.use_default_badwordsids,
mirostat: request.body.mirostat,
mirostat_eta: request.body.mirostat_eta,
mirostat_tau: request.body.mirostat_tau,
grammar: request.body.grammar,
sampler_seed: request.body.sampler_seed,
};
if (request.body.stop_sequence) {
this_settings['stop_sequence'] = request.body.stop_sequence;
}
}
console.log(this_settings);
const args = {
body: JSON.stringify(this_settings),
headers: Object.assign(
{ 'Content-Type': 'application/json' },
getOverrideHeaders((new URL(request.body.api_server))?.host),
),
signal: controller.signal,
};
const MAX_RETRIES = 50;
const delayAmount = 2500;
for (let i = 0; i < MAX_RETRIES; i++) {
try {
const url = request.body.streaming ? `${request.body.api_server}/extra/generate/stream` : `${request.body.api_server}/v1/generate`;
const response = await fetch(url, { method: 'POST', timeout: 0, ...args });
if (request.body.streaming) {
// Pipe remote SSE stream to Express response
forwardFetchResponse(response, response_generate);
return;
} else {
if (!response.ok) {
const errorText = await response.text();
console.log(`Kobold returned error: ${response.status} ${response.statusText} ${errorText}`);
try {
const errorJson = JSON.parse(errorText);
const message = errorJson?.detail?.msg || errorText;
return response_generate.status(400).send({ error: { message } });
} catch {
return response_generate.status(400).send({ error: { message: errorText } });
}
}
const data = await response.json();
console.log('Endpoint response:', data);
return response_generate.send(data);
}
} catch (error) {
// response
switch (error?.status) {
case 403:
case 503: // retry in case of temporary service issue, possibly caused by a queue failure?
console.debug(`KoboldAI is busy. Retry attempt ${i + 1} of ${MAX_RETRIES}...`);
await delay(delayAmount);
break;
default:
if ('status' in error) {
console.log('Status Code from Kobold:', error.status);
}
return response_generate.send({ error: true });
}
}
}
console.log('Max retries exceeded. Giving up.');
return response_generate.send({ error: true });
});
router.post('/status', jsonParser, async function (request, response) {
if (!request.body) return response.sendStatus(400);
let api_server = request.body.api_server;
if (api_server.indexOf('localhost') != -1) {
api_server = api_server.replace('localhost', '127.0.0.1');
}
const args = {
headers: { 'Content-Type': 'application/json' },
};
setAdditionalHeaders(request, args, api_server);
const result = {};
const [koboldUnitedResponse, koboldExtraResponse, koboldModelResponse] = await Promise.all([
// We catch errors both from the response not having a successful HTTP status and from JSON parsing failing
// Kobold United API version
fetch(`${api_server}/v1/info/version`).then(response => {
if (!response.ok) throw new Error(`Kobold API error: ${response.status, response.statusText}`);
return response.json();
}).catch(() => ({ result: '0.0.0' })),
// KoboldCpp version
fetch(`${api_server}/extra/version`).then(response => {
if (!response.ok) throw new Error(`Kobold API error: ${response.status, response.statusText}`);
return response.json();
}).catch(() => ({ version: '0.0' })),
// Current model
fetch(`${api_server}/v1/model`).then(response => {
if (!response.ok) throw new Error(`Kobold API error: ${response.status, response.statusText}`);
return response.json();
}).catch(() => null),
]);
result.koboldUnitedVersion = koboldUnitedResponse.result;
result.koboldCppVersion = koboldExtraResponse.result;
result.model = !koboldModelResponse || koboldModelResponse.result === 'ReadOnly' ?
'no_connection' :
koboldModelResponse.result;
response.send(result);
});
router.post('/transcribe-audio', urlencodedParser, async function (request, response) {
try {
const server = request.body.server;
if (!server) {
console.log('Server is not set');
return response.sendStatus(400);
}
if (!request.file) {
console.log('No audio file found');
return response.sendStatus(400);
}
console.log('Transcribing audio with KoboldCpp', server);
const fileBase64 = fs.readFileSync(request.file.path).toString('base64');
fs.rmSync(request.file.path);
const headers = {};
setAdditionalHeadersByType(headers, TEXTGEN_TYPES.KOBOLDCPP, server, request.user.directories);
const url = new URL(server);
url.pathname = '/api/extra/transcribe';
const result = await fetch(url, {
method: 'POST',
headers: {
...headers,
},
body: JSON.stringify({
prompt: '',
audio_data: fileBase64,
}),
});
if (!result.ok) {
const text = await result.text();
console.log('KoboldCpp request failed', result.statusText, text);
return response.status(500).send(text);
}
const data = await result.json();
console.log('KoboldCpp transcription response', data);
return response.json(data);
} catch (error) {
console.error('KoboldCpp transcription failed', error);
response.status(500).send('Internal server error');
}
});
module.exports = { router };
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