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docs/notebooks/langChain/langchain_llamastack_ray.py
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import os
import re
import html
import json
import time
import requests
from bs4 import BeautifulSoup
from readability import Document as ReadabilityDocument
from markdownify import markdownify
from langchain_community.document_loaders import PyPDFLoader, TextLoader
import tempfile
from llama_stack_client import LlamaStackClient
from langchain_core.language_models.llms import LLM
from typing import Optional, List, Any, Dict
from langchain.chains import LLMChain
from langchain_core.prompts import PromptTemplate
from starlette.requests import Request
from ray import serve
# Prompt Templates (defined globally)
summary_template = PromptTemplate(
input_variables=["document"],
template="""Create a concise summary of this document in 5-10 sentences:
{document}
SUMMARY:"""
)
facts_template = PromptTemplate(
input_variables=["document"],
template="""Extract the most important facts from this document. List them as bullet points:
{document}
KEY FACTS:
-"""
)
qa_template = PromptTemplate(
input_variables=["document", "question"],
template="""Based on the following document, answer the question. If the answer isn't in the document, say so.
DOCUMENT:
{document}
QUESTION: {question}
ANSWER:"""
)
class LlamaStackLLM(LLM):
"""Simple LangChain wrapper for Llama Stack"""
# Pydantic model fields
client: Any = None
model_id: str = "llama3.2:3b"
def __init__(self, client, model_id: str = "llama3.2:3b"):
# Initialize with field values
super().__init__(client=client, model_id=model_id)
def _call(self, prompt: str, stop: Optional[List[str]] = None, **kwargs) -> str:
"""Make inference call to Llama Stack"""
response = self.client.inference.chat_completion(
model_id=self.model_id,
messages=[{"role": "user", "content": prompt}]
)
return response.completion_message.content
@property
def _llm_type(self) -> str:
return "llama_stack"
def load_document(source: str) -> str:
is_url = source.startswith(('http://', 'https://'))
is_pdf = source.lower().endswith('.pdf')
if is_pdf:
return load_pdf(source, is_url=is_url)
elif is_url:
return load_from_url(source)
else:
raise ValueError(f"Unsupported format. Use URLs or PDF files.")
def load_pdf(source: str, is_url: bool = False) -> str:
if is_url:
response = requests.get(source)
response.raise_for_status()
with tempfile.NamedTemporaryFile(delete=False, suffix=".pdf") as temp_file:
temp_file.write(response.content)
file_path = temp_file.name
else:
file_path = source
try:
loader = PyPDFLoader(file_path)
docs = loader.load()
return "\\n\\n".join([doc.page_content for doc in docs])
finally:
if is_url:
os.remove(file_path)
def load_from_url(url: str) -> str:
headers = {'User-Agent': 'Mozilla/5.0 (compatible; DocumentLoader/1.0)'}
response = requests.get(url, headers=headers, timeout=15)
response.raise_for_status()
doc = ReadabilityDocument(response.text)
html_main = doc.summary(html_partial=True)
soup = BeautifulSoup(html_main, "html.parser")
for tag in soup(["script", "style", "noscript", "header", "footer", "nav", "aside"]):
tag.decompose()
md_text = markdownify(str(soup), heading_style="ATX")
md_text = html.unescape(md_text)
md_text = re.sub(r"\n{3,}", "\n\n", md_text).strip()
return md_text
@serve.deployment
class LangChainLlamaStackService:
"""Ray Serve deployment for LangChain + Llama Stack document processing"""
def __init__(self):
print("🚀 Initializing LangChain + Llama Stack Service...")
# Initialize Llama Stack client
self.client = LlamaStackClient(base_url="http://localhost:8321/")
# Initialize LangChain-compatible LLM
self.llm = LlamaStackLLM(self.client)
# Create processing chains
self.summary_chain = LLMChain(llm=self.llm, prompt=summary_template)
self.facts_chain = LLMChain(llm=self.llm, prompt=facts_template)
self.qa_chain = LLMChain(llm=self.llm, prompt=qa_template)
# Storage for processed documents
self.processed_docs = {}
print("✅ Service initialized successfully!")
async def __call__(self, request: Request) -> Dict:
"""Handle HTTP requests to different endpoints"""
path = request.url.path
method = request.method
try:
if path == "/" and method == "GET":
return await self._handle_status()
elif path == "/process" and method == "POST":
return await self._handle_process(request)
elif path == "/ask" and method == "POST":
return await self._handle_ask(request)
elif path == "/summary" and method == "GET":
return await self._handle_summary(request)
elif path == "/facts" and method == "GET":
return await self._handle_facts(request)
elif path == "/docs" and method == "GET":
return await self._handle_list_docs()
else:
return {
"error": "Not found",
"available_endpoints": {
"GET /": "Service status",
"POST /process": "Process document (body: {\"source\": \"url_or_path\"})",
"POST /ask": "Ask question (body: {\"question\": \"your_question\", \"source\": \"optional_doc_id\"})",
"GET /summary?source=doc_id": "Get document summary",
"GET /facts?source=doc_id": "Get document facts",
"GET /docs": "List processed documents"
}
}
except Exception as e:
return {"error": str(e)}
async def _handle_status(self) -> Dict:
"""Return service status"""
return {
"status": "healthy",
"service": "LangChain + Llama Stack Document Processing",
"documents_processed": len(self.processed_docs),
"available_models": [m.identifier for m in self.client.models.list()],
"endpoints": ["/", "/process", "/ask", "/summary", "/facts", "/docs"]
}
async def _handle_process(self, request: Request) -> Dict:
"""Process a document from URL or file path"""
body = await request.json()
source = body.get("source")
if not source:
return {"error": "Missing 'source' in request body"}
try:
# Load document
document = load_document(source)
# Generate summary and facts
summary = self.summary_chain.invoke({"document": document})["text"]
facts = self.facts_chain.invoke({"document": document})["text"]
# Store processed document
self.processed_docs[source] = {
"document": document,
"summary": summary,
"facts": facts,
"processed_at": time.time()
}
return {
"success": True,
"source": source,
"document_length": len(document),
"summary_preview": summary[:200] + "..." if len(summary) > 200 else summary,
"facts_preview": facts[:300] + "..." if len(facts) > 300 else facts
}
except Exception as e:
return {"error": f"Failed to process document: {str(e)}"}
async def _handle_ask(self, request: Request) -> Dict:
"""Answer questions about processed documents"""
body = await request.json()
question = body.get("question")
source = body.get("source")
if not question:
return {"error": "Missing 'question' in request body"}
if not self.processed_docs:
return {"error": "No documents processed yet. Use /process endpoint first."}
try:
# Select document
if source and source in self.processed_docs:
doc_data = self.processed_docs[source]
else:
# Use the most recent document
doc_data = list(self.processed_docs.values())[-1]
source = list(self.processed_docs.keys())[-1]
# Generate answer
answer = self.qa_chain.invoke({
"document": doc_data["document"],
"question": question
})["text"]
return {
"question": question,
"answer": answer,
"source": source
}
except Exception as e:
return {"error": f"Failed to answer question: {str(e)}"}
async def _handle_summary(self, request: Request) -> Dict:
"""Get summary of a processed document"""
source = request.query_params.get("source")
if not self.processed_docs:
return {"error": "No documents processed yet"}
if source and source in self.processed_docs:
doc_data = self.processed_docs[source]
else:
# Use the most recent document
doc_data = list(self.processed_docs.values())[-1]
source = list(self.processed_docs.keys())[-1]
return {
"source": source,
"summary": doc_data["summary"]
}
async def _handle_facts(self, request: Request) -> Dict:
"""Get facts from a processed document"""
source = request.query_params.get("source")
if not self.processed_docs:
return {"error": "No documents processed yet"}
if source and source in self.processed_docs:
doc_data = self.processed_docs[source]
else:
# Use the most recent document
doc_data = list(self.processed_docs.values())[-1]
source = list(self.processed_docs.keys())[-1]
return {
"source": source,
"facts": doc_data["facts"]
}
async def _handle_list_docs(self) -> Dict:
"""List all processed documents"""
docs_info = []
for source, data in self.processed_docs.items():
docs_info.append({
"source": source,
"document_length": len(data["document"]),
"processed_at": data["processed_at"],
"summary_preview": data["summary"][:100] + "..." if len(data["summary"]) > 100 else data["summary"]
})
return {
"processed_documents": docs_info,
"total_count": len(self.processed_docs)
}
def main():
"""Main function to start the Ray Serve application"""
# Create the application
app = LangChainLlamaStackService.bind()
# Deploy the application locally
print("🚀 Starting LangChain + Llama Stack Ray Serve application...")
serve.run(app, route_prefix="/")
# Wait for service to initialize
print("⏳ Waiting for service to initialize...")
time.sleep(5)
# Test the service
try:
response = requests.get("http://localhost:8000/")
print(f"✅ Service response: {response.json()}")
print("🎉 Service is running successfully!")
except Exception as e:
print(f"⚠️ Could not test service: {e}")
print(" Service might still be starting up...")
# Show service information
print("\n" + "="*60)
print("🌐 LangChain + Llama Stack Service is running on:")
print(" http://localhost:8000/")
print("="*60)
print("📋 Available endpoints:")
print(" GET / - Service status")
print(" POST /process - Process document")
print(" POST /ask - Ask questions")
print(" GET /summary - Get document summary")
print(" GET /facts - Get document facts")
print(" GET /docs - List processed documents")
print("="*60)
print("🧪 Example requests:")
print(" # Process a document:")
print(" curl -X POST http://localhost:8000/process \\")
print(" -H 'Content-Type: application/json' \\")
print(" -d '{\"source\": \"https://example.com/article\"}'")
print("")
print(" # Ask a question:")
print(" curl -X POST http://localhost:8000/ask \\")
print(" -H 'Content-Type: application/json' \\")
print(" -d '{\"question\": \"What is the main topic?\"}'")
print("")
print(" # Get summary:")
print(" curl http://localhost:8000/summary")
print("="*60)
print("🛑 Press Ctrl+C to stop the service...")
try:
# Keep the service alive
while True:
time.sleep(1)
except KeyboardInterrupt:
print("\n🛑 Stopping service...")
serve.shutdown()
print("👋 Service stopped successfully!")
if __name__ == "__main__":
main()
# import requests
# # Step 1: First, process/load the document
# process_response = requests.post(
# "http://localhost:8000/process",
# json={"source": "https://en.wikipedia.org/wiki/What%27s_Happening!!"}
# )
# print("Processing result:", process_response.json())
# # Step 2: Then get the facts
# facts_response = requests.get("http://localhost:8000/facts")
# print("Facts:", facts_response.json())
# # Or get facts for specific document
# facts_response = requests.get(
# "http://localhost:8000/facts",
# params={"source": "https://en.wikipedia.org/wiki/What%27s_Happening!!"}
# )
# print("Facts for specific doc:", facts_response.json())