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const express = require('express');
const router = express.Router();
const crypto = require('crypto');
const { titleConvo, AnthropicClient } = require('../../../app');
const requireJwtAuth = require('../../../middleware/requireJwtAuth');
const { abortMessage } = require('../../../utils');
const { saveMessage, getConvoTitle, saveConvo, getConvo } = require('../../../models');
const { handleError, sendMessage, createOnProgress } = require('./handlers');
const abortControllers = new Map();
router.post('/abort', requireJwtAuth, async (req, res) => {
return await abortMessage(req, res, abortControllers);
});
router.post('/', requireJwtAuth, async (req, res) => {
const { endpoint, text, parentMessageId, conversationId: oldConversationId } = req.body;
if (text.length === 0) {
return handleError(res, { text: 'Prompt empty or too short' });
}
if (endpoint !== 'anthropic') {
return handleError(res, { text: 'Illegal request' });
}
const endpointOption = {
promptPrefix: req.body?.promptPrefix ?? null,
modelLabel: req.body?.modelLabel ?? null,
token: req.body?.token ?? null,
modelOptions: {
model: req.body?.model ?? 'claude-1',
temperature: req.body?.temperature ?? 0.7,
maxOutputTokens: req.body?.maxOutputTokens ?? 1024,
topP: req.body?.topP ?? 0.7,
topK: req.body?.topK ?? 40,
},
};
const conversationId = oldConversationId || crypto.randomUUID();
return await ask({
text,
endpointOption,
conversationId,
parentMessageId,
req,
res,
});
});
const ask = async ({ text, endpointOption, parentMessageId = null, conversationId, req, res }) => {
res.writeHead(200, {
Connection: 'keep-alive',
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache, no-transform',
'Access-Control-Allow-Origin': '*',
'X-Accel-Buffering': 'no',
});
let userMessage;
let userMessageId;
let responseMessageId;
let lastSavedTimestamp = 0;
const { overrideParentMessageId = null } = req.body;
try {
const getIds = (data) => {
userMessage = data.userMessage;
userMessageId = data.userMessage.messageId;
responseMessageId = data.responseMessageId;
if (!conversationId) {
conversationId = data.conversationId;
}
};
const { onProgress: progressCallback, getPartialText } = createOnProgress({
onProgress: ({ text: partialText }) => {
const currentTimestamp = Date.now();
if (currentTimestamp - lastSavedTimestamp > 500) {
lastSavedTimestamp = currentTimestamp;
saveMessage({
messageId: responseMessageId,
sender: 'Anthropic',
conversationId,
parentMessageId: overrideParentMessageId || userMessageId,
text: partialText,
unfinished: true,
cancelled: false,
error: false,
});
}
},
});
const abortController = new AbortController();
abortController.abortAsk = async function () {
this.abort();
const responseMessage = {
messageId: responseMessageId,
sender: 'Anthropic',
conversationId,
parentMessageId: overrideParentMessageId || userMessageId,
text: getPartialText(),
model: endpointOption.modelOptions.model,
unfinished: false,
cancelled: true,
error: false,
};
saveMessage(responseMessage);
return {
title: await getConvoTitle(req.user.id, conversationId),
final: true,
conversation: await getConvo(req.user.id, conversationId),
requestMessage: userMessage,
responseMessage: responseMessage,
};
};
const onStart = (userMessage) => {
sendMessage(res, { message: userMessage, created: true });
abortControllers.set(userMessage.conversationId, { abortController, ...endpointOption });
};
const client = new AnthropicClient(endpointOption.token);
let response = await client.sendMessage(text, {
getIds,
debug: false,
user: req.user.id,
conversationId,
parentMessageId,
overrideParentMessageId,
...endpointOption,
onProgress: progressCallback.call(null, {
res,
text,
parentMessageId: overrideParentMessageId || userMessageId,
}),
onStart,
abortController,
});
if (overrideParentMessageId) {
response.parentMessageId = overrideParentMessageId;
}
await saveConvo(req.user.id, {
...endpointOption,
...endpointOption.modelOptions,
conversationId,
endpoint: 'anthropic',
});
await saveMessage(response);
sendMessage(res, {
title: await getConvoTitle(req.user.id, conversationId),
final: true,
conversation: await getConvo(req.user.id, conversationId),
requestMessage: userMessage,
responseMessage: response,
});
res.end();
if (parentMessageId == '00000000-0000-0000-0000-000000000000') {
const title = await titleConvo({ text, response });
await saveConvo(req.user.id, {
conversationId,
title,
});
}
} catch (error) {
console.error(error);
const errorMessage = {
messageId: responseMessageId,
sender: 'Anthropic',
conversationId,
parentMessageId,
unfinished: false,
cancelled: false,
error: true,
text: error.message,
};
await saveMessage(errorMessage);
handleError(res, errorMessage);
}
};
module.exports = router;
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