Olostep + LangChain Integratie

pip install langchain-olostep

poetry add langchain-olostep

from langchain_olostep import scrape_website
import asyncio

# Scrape een website
content = asyncio.run(scrape_website.ainvoke({
    "url": "https://example.com",
    "format": "markdown"
}))

print(content)

# Wacht op dynamische inhoud
content = asyncio.run(scrape_website.ainvoke({
    "url": "https://example.com",
    "format": "markdown",
    "wait_before_scraping": 2000
}))

# Gebruik gespecialiseerde parser
content = asyncio.run(scrape_website.ainvoke({
    "url": "https://www.amazon.com/dp/PRODUCT_ID",
    "parser": "@olostep/amazon-product",
    "format": "json"
}))

from langchain_olostep import scrape_batch
import asyncio

# Scrape meerdere URL's
result = asyncio.run(scrape_batch.ainvoke({
    "urls": [
        "https://example1.com",
        "https://example2.com",
        "https://example3.com"
    ],
    "format": "markdown"
}))

print(result)
# Geeft terug: {"batch_id": "batch_xxx", "status": "in_progress", ...}

from langchain_olostep import answer_question
import asyncio

# Stel een eenvoudige vraag
result = asyncio.run(answer_question.ainvoke({
    "task": "Wat is de hoofdstad van Frankrijk?"
}))

print(result)
# Geeft terug: {"answer": {"result": "Parijs"}, "sources": [...]}

# Krijg gestructureerde data met JSON-schema
result = asyncio.run(answer_question.ainvoke({
    "task": "Wat is het laatste boek van J.K. Rowling?",
    "json_schema": {
        "book_title": "",
        "author": "",
        "release_date": ""
    }
}))

print(result)
# Geeft gestructureerd antwoord met bronnen

# Verrijk bedrijfsgegevens
result = asyncio.run(answer_question.ainvoke({
    "task": "Vind de CEO en het hoofdkantoor van Stripe",
    "json_schema": {
        "ceo_name": "",
        "headquarters": "",
        "founded_year": ""
    }
}))

# Behandelt onzekerheid met "NOT_FOUND" waarden

from langchain_olostep import extract_urls
import asyncio

# Haal alle URL's van een website op
result = asyncio.run(extract_urls.ainvoke({
    "url": "https://example.com",
    "top_n": 100
}))

print(result)
# Geeft terug: {"urls": [...], "total_urls": 100, ...}

# Haal alleen blog-URL's op
result = asyncio.run(extract_urls.ainvoke({
    "url": "https://example.com",
    "include_urls": ["/blog/**"],
    "exclude_urls": ["/admin/**", "/private/**"],
    "top_n": 50
}))

from langchain_olostep import crawl_website
import asyncio

# Crawl volledige documentatiesite
result = asyncio.run(crawl_website.ainvoke({
    "start_url": "https://docs.example.com",
    "max_pages": 100
}))

print(result)
# Geeft terug: {"crawl_id": "crawl_xxx", "status": "in_progress", ...}

# Crawl met URL-filters
result = asyncio.run(crawl_website.ainvoke({
    "start_url": "https://example.com",
    "max_pages": 200,
    "include_urls": ["/**"],
    "exclude_urls": ["/admin/**", "/private/**"],
    "max_depth": 3
}))

from langchain.agents import initialize_agent, AgentType
from langchain_openai import ChatOpenAI
from langchain_olostep import (
    scrape_website,
    answer_question,
    extract_urls
)

# Maak agent met Olostep tools
tools = [scrape_website, answer_question, extract_urls]
llm = ChatOpenAI(model="gpt-4o-mini")

agent = initialize_agent(
    tools=tools,
    llm=llm,
    agent=AgentType.ZERO_SHOT_REACT_DESCRIPTION,
    verbose=True
)

# Gebruik de agent
result = agent.run("""
Onderzoek het bedrijf op https://company.com:
1. Scrape hun over-pagina
2. Zoek naar hun laatste financieringsronde
3. Haal al hun productpagina's op
""")

print(result)

from langgraph.graph import StateGraph, END
from langchain_olostep import (
    scrape_website,
    scrape_batch,
    answer_question,
    extract_urls
)
from langchain_openai import ChatOpenAI
import json

def create_research_agent():
    workflow = StateGraph(dict)
    
    def discover_pages(state):
        # Haal alle URL's van de doelwebsite op
        result = extract_urls.invoke({
            "url": state["target_url"],
            "include_urls": ["/product/**"],
            "top_n": 50
        })
        state["urls"] = json.loads(result)["urls"]
        return state
    
    def scrape_pages(state):
        # Scrape ontdekte pagina's in batch
        result = scrape_batch.invoke({
            "urls": state["urls"],
            "format": "markdown"
        })
        state["batch_id"] = json.loads(result)["batch_id"]
        return state
    
    def answer_questions(state):
        # Gebruik AI om vragen over de data te beantwoorden
        result = answer_question.invoke({
            "task": state["research_question"],
            "json_schema": state["desired_format"]
        })
        state["answer"] = json.loads(result)["answer"]
        return state
    
    workflow.add_node("discover", discover_pages)
    workflow.add_node("scrape", scrape_pages)
    workflow.add_node("analyze", answer_questions)
    
    workflow.set_entry_point("discover")
    workflow.add_edge("discover", "scrape")
    workflow.add_edge("scrape", "analyze")
    workflow.add_edge("analyze", END)
    
    return workflow.compile()

# Gebruik de agent
agent = create_research_agent()
result = agent.invoke({
    "target_url": "https://store.com",
    "research_question": "Wat zijn de top 5 duurste producten?",
    "desired_format": {
        "products": [{"name": "", "price": "", "url": ""}]
    }
})