Spaces:
Running
Running
File size: 4,743 Bytes
a80ecb8 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 |
import express from 'express';
import logger from '../utils/logger';
import multer from 'multer';
import path from 'path';
import crypto from 'crypto';
import fs from 'fs';
import { Embeddings } from '@langchain/core/embeddings';
import { getAvailableEmbeddingModelProviders } from '../lib/providers';
import { PDFLoader } from '@langchain/community/document_loaders/fs/pdf';
import { DocxLoader } from '@langchain/community/document_loaders/fs/docx';
import { RecursiveCharacterTextSplitter } from '@langchain/textsplitters';
import { Document } from 'langchain/document';
const router = express.Router();
const splitter = new RecursiveCharacterTextSplitter({
chunkSize: 500,
chunkOverlap: 100,
});
const storage = multer.diskStorage({
destination: (req, file, cb) => {
cb(null, path.join(process.cwd(), './uploads'));
},
filename: (req, file, cb) => {
const splitedFileName = file.originalname.split('.');
const fileExtension = splitedFileName[splitedFileName.length - 1];
if (!['pdf', 'docx', 'txt'].includes(fileExtension)) {
return cb(new Error('File type is not supported'), '');
}
cb(null, `${crypto.randomBytes(16).toString('hex')}.${fileExtension}`);
},
});
const upload = multer({ storage });
router.post(
'/',
upload.fields([
{ name: 'files' },
{ name: 'embedding_model', maxCount: 1 },
{ name: 'embedding_model_provider', maxCount: 1 },
]),
async (req, res) => {
try {
const { embedding_model, embedding_model_provider } = req.body;
if (!embedding_model || !embedding_model_provider) {
res
.status(400)
.json({ message: 'Missing embedding model or provider' });
return;
}
const embeddingModels = await getAvailableEmbeddingModelProviders();
const provider =
embedding_model_provider ?? Object.keys(embeddingModels)[0];
const embeddingModel: Embeddings =
embedding_model ?? Object.keys(embeddingModels[provider])[0];
let embeddingsModel: Embeddings | undefined;
if (
embeddingModels[provider] &&
embeddingModels[provider][embeddingModel]
) {
embeddingsModel = embeddingModels[provider][embeddingModel].model as
| Embeddings
| undefined;
}
if (!embeddingsModel) {
res.status(400).json({ message: 'Invalid LLM model selected' });
return;
}
const files = req.files['files'] as Express.Multer.File[];
if (!files || files.length === 0) {
res.status(400).json({ message: 'No files uploaded' });
return;
}
await Promise.all(
files.map(async (file) => {
let docs: Document[] = [];
if (file.mimetype === 'application/pdf') {
const loader = new PDFLoader(file.path);
docs = await loader.load();
} else if (
file.mimetype ===
'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
) {
const loader = new DocxLoader(file.path);
docs = await loader.load();
} else if (file.mimetype === 'text/plain') {
const text = fs.readFileSync(file.path, 'utf-8');
docs = [
new Document({
pageContent: text,
metadata: {
title: file.originalname,
},
}),
];
}
const splitted = await splitter.splitDocuments(docs);
const json = JSON.stringify({
title: file.originalname,
contents: splitted.map((doc) => doc.pageContent),
});
const pathToSave = file.path.replace(/\.\w+$/, '-extracted.json');
fs.writeFileSync(pathToSave, json);
const embeddings = await embeddingsModel.embedDocuments(
splitted.map((doc) => doc.pageContent),
);
const embeddingsJSON = JSON.stringify({
title: file.originalname,
embeddings: embeddings,
});
const pathToSaveEmbeddings = file.path.replace(
/\.\w+$/,
'-embeddings.json',
);
fs.writeFileSync(pathToSaveEmbeddings, embeddingsJSON);
}),
);
res.status(200).json({
files: files.map((file) => {
return {
fileName: file.originalname,
fileExtension: file.filename.split('.').pop(),
fileId: file.filename.replace(/\.\w+$/, ''),
};
}),
});
} catch (err: any) {
logger.error(`Error in uploading file results: ${err.message}`);
res.status(500).json({ message: 'An error has occurred.' });
}
},
);
export default router;
|