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Create main.py

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  1. main.py +126 -0
main.py ADDED
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+ from fastapi import FastAPI, Form
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+ from fastapi.responses import HTMLResponse
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+ import time
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+ from ingest import ingest
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+ from query import retrieve, rerank, answer
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+
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+ app = FastAPI()
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+
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+
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+ @app.get("/", response_class=HTMLResponse)
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+ def home():
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+ return """
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+ <!DOCTYPE html>
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+ <html>
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+ <head>
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+ <title>Mini RAG App</title>
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+ <style>
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+ body { font-family: Arial; margin: 40px; }
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+ textarea { width: 100%; height: 120px; }
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+ input[type=text] { width: 100%; padding: 8px; }
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+ button { padding: 10px 20px; margin-top: 10px; }
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+ .box { border: 1px solid #ccc; padding: 15px; margin-top: 20px; }
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+ .source { font-size: 14px; color: #555; margin-top: 5px; }
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+ #upload-status { color: green; margin-top: 10px; }
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+ </style>
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+ </head>
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+ <body>
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+
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+ <h2>Mini RAG Demo</h2>
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+
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+ <div class="box">
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+ <h3>1. Upload / Paste Text</h3>
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+ <textarea id="upload-text" placeholder="Paste document text here"></textarea>
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+ <br>
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+ <button onclick="uploadText()">Upload</button>
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+ <div id="upload-status"></div>
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+ </div>
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+
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+ <div class="box">
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+ <h3>2. Ask Question</h3>
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+ <form action="/ask" method="post">
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+ <input type="text" name="question" placeholder="Ask a question">
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+ <br>
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+ <button type="submit">Ask</button>
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+ </form>
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+ </div>
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+
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+ <script>
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+ async function uploadText() {
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+ const text = document.getElementById('upload-text').value;
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+ if (!text.trim()) {
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+ alert('Please enter text to upload.');
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+ return;
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+ }
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+
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+ const formData = new FormData();
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+ formData.append('text', text);
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+
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+ try {
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+ const response = await fetch('/upload', {
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+ method: 'POST',
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+ body: formData
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+ });
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+
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+ if (response.ok) {
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+ document.getElementById('upload-status').innerText = '✅ Text stored in vector DB';
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+ document.getElementById('upload-text').value = ''; // optional: clear text area
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+ } else {
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+ document.getElementById('upload-status').innerText = '❌ Upload failed';
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+ }
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+ } catch (err) {
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+ document.getElementById('upload-status').innerText = '❌ Error: ' + err;
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+ }
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+ }
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+ </script>
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+
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+ </body>
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+ </html>
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+ """
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+
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+
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+ # Upload endpoint
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+
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+ @app.post("/upload")
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+ def upload(text: str = Form(...)):
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+ ingest(text)
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+ return {"status": "success"}
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+
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+
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+
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+ # Ask endpoint
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+
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+ @app.post("/ask", response_class=HTMLResponse)
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+ def ask(question: str = Form(...)):
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+ start_time = time.time()
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+ docs = retrieve(question)
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+ reranked_docs = rerank(question, docs)
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+
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+ if not reranked_docs:
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+ return "<h3>No relevant context found.</h3><a href='/'>Back</a>"
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+
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+
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+ context_text = "\n\n".join([d["text"] for d in reranked_docs])
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+ ans = answer(question, context_text)
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+ elapsed = round(time.time() - start_time, 2)
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+
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+
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+ html = f"""
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+ <h2>Answer</h2>
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+ <div class="answer-box" style="white-space: pre-wrap;">{ans}</div>
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+
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+
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+ <h3>Sources</h3>
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+ """
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+ for i, d in enumerate(reranked_docs):
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+ html += f"""
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+ <div class="source">
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+ [{i+1}] {d['metadata'].get('source', 'unknown')} | position {d['metadata'].get('position')}
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+ </div>
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+ """
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+
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+ html += f"""
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+ <p><b>Time taken:</b> {elapsed} seconds</p>
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+ <a href="/">Ask another question</a>
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+ """
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+ return html