first commit

This commit is contained in:
Gitea
2026-06-05 10:25:09 +05:30
commit 0b5715f4b0
10 changed files with 4276 additions and 0 deletions
+723
View File
@@ -0,0 +1,723 @@
require("dotenv").config();
const fs = require("fs");
const path = require("path");
// ======================
// SUPPRESS PDF WARNINGS
// ======================
const originalWarn = console.warn;
console.warn = (
message,
...args
) => {
if (
typeof message ===
"string" &&
(
message.includes(
"UnknownErrorException"
) ||
message.includes(
"TT:"
)
)
) {
return;
}
originalWarn(
message,
...args
);
};
// ======================
// PDF.js
// ======================
const pdfjsLib = require(
"pdfjs-dist/legacy/build/pdf.mjs"
);
// ======================
// Transformers
// ======================
const {
pipeline,
} = require("@xenova/transformers");
// ======================
// Qdrant
// ======================
const {
QdrantClient,
} = require("@qdrant/js-client-rest");
// ======================
// QDRANT CONFIG
// ======================
const qdrant = new QdrantClient({
url: "http://20.40.61.65:6333",
checkCompatibility: false,
timeout: 30000,
});
const COLLECTION_NAME =
"pdf_rag";
let embedder;
// ======================
// LOAD MODEL
// ======================
async function loadModel() {
console.log(
"⏳ Loading embedding model..."
);
embedder = await pipeline(
"feature-extraction",
"Xenova/all-MiniLM-L6-v2"
);
console.log(
"✅ Embedding model loaded"
);
}
// ======================
// SMART CHUNKING
// ======================
function chunkText(
text,
chunkSize = 800,
overlap = 150
) {
const chunks = [];
text = text
.replace(/\s+/g, " ")
.trim();
let start = 0;
while (
start < text.length
) {
let end =
start + chunkSize;
// Try sentence ending
if (
end < text.length
) {
const lastPeriod =
text.lastIndexOf(
".",
end
);
if (
lastPeriod >
start
) {
end =
lastPeriod +
1;
}
}
const chunk = text
.slice(start, end)
.trim();
if (
chunk.length > 50
) {
chunks.push(
chunk
);
}
start =
end - overlap;
}
return chunks;
}
// ======================
// CREATE EMBEDDING
// ======================
async function createEmbedding(
text
) {
const output =
await embedder(text, {
pooling: "mean",
normalize: true,
});
return Array.from(
output.data
);
}
// ======================
// CREATE COLLECTION
// ======================
async function createCollection() {
try {
await qdrant.getCollection(
COLLECTION_NAME
);
console.log(
"️ Collection already exists"
);
} catch (err) {
console.log(
"⏳ Creating collection..."
);
await qdrant.createCollection(
COLLECTION_NAME,
{
vectors: {
size: 384,
distance:
"Cosine",
},
}
);
console.log(
"✅ Collection created"
);
}
}
// ======================
// EXTRACT TEXT FROM PDF
// ======================
async function extractTextFromPDF(
filePath
) {
try {
const dataBuffer =
fs.readFileSync(
filePath
);
const uint8Array =
new Uint8Array(
dataBuffer
);
const loadingTask =
pdfjsLib.getDocument(
{
data: uint8Array,
}
);
const pdf =
await loadingTask.promise;
let fullText = "";
console.log(
`📄 Pages: ${pdf.numPages}`
);
for (
let i = 1;
i <= pdf.numPages;
i++
) {
const page =
await pdf.getPage(i);
const content =
await page.getTextContent();
const pageText =
content.items
.map(
(item) =>
item.str
)
.join(" ");
fullText +=
pageText + "\n";
}
return fullText;
} catch (error) {
console.log(
"❌ PDF extraction error:",
error
);
return "";
}
}
// ======================
// PROCESS PDF
// ======================
async function processPDF(filePath, fileName) {
try {
const dataBuffer = fs.readFileSync(filePath);
const pdf = await pdfjsLib
.getDocument({
data: new Uint8Array(dataBuffer),
})
.promise;
console.log(
`📄 ${fileName} - ${pdf.numPages} pages`
);
const batchSize = 50;
let batchPoints = [];
let globalChunkIndex = 0;
for (
let pageNum = 1;
pageNum <= pdf.numPages;
pageNum++
) {
console.log(
`📖 Processing page ${pageNum}/${pdf.numPages}`
);
const page =
await pdf.getPage(pageNum);
const content =
await page.getTextContent();
const pageText =
content.items
.map((item) => item.str)
.join(" ");
if (
!pageText ||
pageText.trim().length === 0
) {
continue;
}
const chunks = chunkText(
pageText,
1200,
250
);
for (const chunk of chunks) {
const embedding =
await createEmbedding(chunk);
batchPoints.push({
id: Number(
`${Date.now()}${globalChunkIndex}`
),
vector: embedding,
payload: {
file: fileName,
page: pageNum,
chunk: globalChunkIndex,
text: chunk,
created_at:
new Date().toISOString(),
},
});
globalChunkIndex++;
if (
batchPoints.length >= batchSize
) {
console.log(
`⬆️ Uploading ${batchPoints.length} vectors`
);
await qdrant.upsert(
COLLECTION_NAME,
{
wait: true,
points: batchPoints,
}
);
batchPoints = [];
}
}
}
if (batchPoints.length > 0) {
console.log(
`⬆️ Uploading final ${batchPoints.length} vectors`
);
await qdrant.upsert(
COLLECTION_NAME,
{
wait: true,
points: batchPoints,
}
);
}
console.log(
`${fileName} indexed successfully`
);
} catch (error) {
console.log(
`❌ Error processing ${fileName}:`,
error
);
}
}
// ======================
// MAIN
// ======================
async function main() {
try {
await loadModel();
await createCollection();
const folder =
path.join(
__dirname,
"uploads"
);
if (
!fs.existsSync(
folder
)
) {
console.log(
"❌ uploads folder not found"
);
return;
}
const files =
fs
.readdirSync(
folder
)
.filter((file) =>
file.endsWith(
".pdf"
)
);
if (
files.length === 0
) {
console.log(
"⚠️ No PDFs found"
);
return;
}
console.log(
`📚 Found ${files.length} PDFs`
);
for (const file of files) {
const filePath =
path.join(
folder,
file
);
console.log(
`\n📄 Processing ${file}`
);
await processPDF(
filePath,
file
);
}
console.log(
"\n🎉 All PDFs indexed successfully"
);
} catch (err) {
console.error(
"❌ MAIN ERROR:",
err
);
}
}
main();
// require("dotenv").config();
// const fs = require("fs");
// const path = require("path");
// const crypto = require("crypto");
// // ─── Suppress PDF warnings ────────────────────────────────────────────────────
// const _warn = console.warn;
// console.warn = (msg, ...a) => {
// if (typeof msg === "string" && (msg.includes("UnknownErrorException") || msg.includes("TT:"))) return;
// _warn(msg, ...a);
// };
// const pdfjsLib = require("pdfjs-dist/legacy/build/pdf.mjs");
// const { pipeline } = require("@xenova/transformers");
// const { QdrantClient } = require("@qdrant/js-client-rest");
// // ─── Config ───────────────────────────────────────────────────────────────────
// const QDRANT_URL = process.env.QDRANT_URL || "http://20.40.61.65:6333";
// const COLLECTION_NAME = "pdf_rag";
// const VECTOR_SIZE = 384;
// const CHUNK_SIZE = 1200;
// const CHUNK_OVERLAP = 250;
// const BATCH_SIZE = 100; // points per upsert call
// const EMBED_CONCURRENCY = 8; // parallel embeddings at once
// const MAX_RETRIES = 3;
// const qdrant = new QdrantClient({ url: QDRANT_URL, checkCompatibility: false, timeout: 60000 });
// let embedder;
// // ─── Semaphore ─────────────────────────────────────────────────────────────────
// class Semaphore {
// constructor(n) { this.n = n; this.queue = []; }
// acquire() {
// return new Promise(res => {
// if (this.n > 0) { this.n--; res(); }
// else this.queue.push(res);
// });
// }
// release() {
// if (this.queue.length) this.queue.shift()();
// else this.n++;
// }
// }
// // ─── Retry helper ─────────────────────────────────────────────────────────────
// async function withRetry(fn, retries = MAX_RETRIES, delay = 500) {
// for (let i = 0; i <= retries; i++) {
// try { return await fn(); }
// catch (err) {
// if (i === retries) throw err;
// console.warn(` ⚠️ Retry ${i + 1}/${retries} after error: ${err.message}`);
// await new Promise(r => setTimeout(r, delay * 2 ** i));
// }
// }
// }
// // ─── Deterministic UUID from content hash ────────────────────────────────────
// // Prevents duplicates if you re-run indexing on the same file
// function makePointId(fileName, page, chunkIndex) {
// const hash = crypto
// .createHash("sha256")
// .update(`${fileName}::${page}::${chunkIndex}`)
// .digest("hex");
// // Qdrant supports UUID strings or unsigned ints; use hex slice as UUID-like string
// return `${hash.slice(0,8)}-${hash.slice(8,12)}-${hash.slice(12,16)}-${hash.slice(16,20)}-${hash.slice(20,32)}`;
// }
// // ─── Chunking ─────────────────────────────────────────────────────────────────
// function chunkText(text, size = CHUNK_SIZE, overlap = CHUNK_OVERLAP) {
// const chunks = [];
// text = text.replace(/\s+/g, " ").trim();
// let start = 0;
// while (start < text.length) {
// let end = start + size;
// if (end < text.length) {
// const last = text.lastIndexOf(".", end);
// if (last > start) end = last + 1;
// }
// const chunk = text.slice(start, end).trim();
// if (chunk.length > 50) chunks.push(chunk);
// start = end - overlap;
// }
// return chunks;
// }
// // ─── Embedding ────────────────────────────────────────────────────────────────
// async function embed(text) {
// const out = await embedder(text, { pooling: "mean", normalize: true });
// return Array.from(out.data);
// }
// // Embed multiple texts with bounded parallelism
// async function embedBatch(texts) {
// const sem = new Semaphore(EMBED_CONCURRENCY);
// return Promise.all(
// texts.map(async (text) => {
// await sem.acquire();
// try { return await embed(text); }
// finally { sem.release(); }
// })
// );
// }
// // ─── Qdrant helpers ───────────────────────────────────────────────────────────
// async function ensureCollection() {
// try {
// await qdrant.getCollection(COLLECTION_NAME);
// console.log("️ Collection already exists");
// } catch {
// console.log("⏳ Creating collection...");
// await qdrant.createCollection(COLLECTION_NAME, {
// vectors: { size: VECTOR_SIZE, distance: "Cosine" },
// // Optimizers: tune for bulk ingest speed, re-enable indexing after
// optimizers_config: { indexing_threshold: 0 },
// });
// console.log("✅ Collection created");
// }
// }
// // Upload a batch with retry
// async function upsertBatch(points) {
// await withRetry(() =>
// qdrant.upsert(COLLECTION_NAME, { wait: true, points })
// );
// }
// // After bulk ingest, re-enable HNSW indexing
// async function enableIndexing() {
// await qdrant.updateCollection(COLLECTION_NAME, {
// optimizers_config: { indexing_threshold: 20000 },
// });
// console.log("🔧 HNSW indexing re-enabled");
// }
// // ─── Check if file already indexed ───────────────────────────────────────────
// async function isFileIndexed(fileName) {
// try {
// const result = await qdrant.scroll(COLLECTION_NAME, {
// filter: { must: [{ key: "file", match: { value: fileName } }] },
// limit: 1,
// with_payload: false,
// with_vector: false,
// });
// return result.points.length > 0;
// } catch { return false; }
// }
// // ─── Process a single PDF ─────────────────────────────────────────────────────
// async function processPDF(filePath, fileName) {
// console.log(`\n📄 ${fileName}`);
// if (await isFileIndexed(fileName)) {
// console.log(` ⏭️ Already indexed — skipping`);
// return;
// }
// const pdf = await pdfjsLib
// .getDocument({ data: new Uint8Array(fs.readFileSync(filePath)) })
// .promise;
// console.log(` 📖 ${pdf.numPages} pages`);
// const allChunks = []; // { text, page, chunkIndex }
// // 1️⃣ Extract all text first (fast, sequential is fine for I/O)
// for (let p = 1; p <= pdf.numPages; p++) {
// const page = await pdf.getPage(p);
// const content = await page.getTextContent();
// const text = content.items.map(i => i.str).join(" ");
// if (!text.trim()) continue;
// const chunks = chunkText(text);
// chunks.forEach((chunk, ci) => allChunks.push({ text: chunk, page: p, chunkIndex: allChunks.length }));
// }
// console.log(` 🧩 ${allChunks.length} chunks — embedding with concurrency=${EMBED_CONCURRENCY}`);
// // 2️⃣ Embed all chunks in parallel (bounded by semaphore)
// const start = Date.now();
// const vectors = await embedBatch(allChunks.map(c => c.text));
// const elapsed = ((Date.now() - start) / 1000).toFixed(1);
// console.log(` ⚡ Embedding done in ${elapsed}s`);
// // 3️⃣ Build points
// const points = allChunks.map((c, i) => ({
// id: makePointId(fileName, c.page, c.chunkIndex),
// vector: vectors[i],
// payload: {
// file: fileName,
// page: c.page,
// chunk: c.chunkIndex,
// text: c.text,
// created_at: new Date().toISOString(),
// },
// }));
// // 4️⃣ Batch upsert with progress
// let uploaded = 0;
// for (let i = 0; i < points.length; i += BATCH_SIZE) {
// const batch = points.slice(i, i + BATCH_SIZE);
// await upsertBatch(batch);
// uploaded += batch.length;
// process.stdout.write(`\r ⬆️ ${uploaded}/${points.length} vectors uploaded`);
// }
// console.log(`\n ✅ ${fileName} indexed`);
// }
// // ─── Main ─────────────────────────────────────────────────────────────────────
// async function main() {
// console.log("⏳ Loading embedding model...");
// embedder = await pipeline("feature-extraction", "Xenova/all-MiniLM-L6-v2");
// console.log("✅ Model loaded\n");
// await ensureCollection();
// const folder = path.join(__dirname, "uploads");
// if (!fs.existsSync(folder)) return console.log("❌ uploads/ folder not found");
// const pdfs = fs.readdirSync(folder).filter(f => f.endsWith(".pdf"));
// if (!pdfs.length) return console.log("⚠️ No PDFs found");
// console.log(`📚 Found ${pdfs.length} PDF(s)\n`);
// const t0 = Date.now();
// for (const file of pdfs) {
// await processPDF(path.join(folder, file), file);
// }
// await enableIndexing(); // re-enable HNSW after bulk load
// console.log(`\n🎉 Done in ${((Date.now() - t0) / 1000).toFixed(1)}s`);
// }
// main().catch(err => { console.error("❌ Fatal:", err); process.exit(1); });