veryfinal.py

"""Enhanced LangGraph + Agno Hybrid Agent System"""
import os
import time
import random
from dotenv import load_dotenv
from typing import List, Dict, Any, TypedDict, Annotated
import operator

# LangGraph imports
from langgraph.graph import START, StateGraph, MessagesState
from langgraph.prebuilt import tools_condition, ToolNode
from langgraph.checkpoint.memory import MemorySaver

# LangChain imports
from langchain_core.messages import SystemMessage, HumanMessage, AIMessage
from langchain_core.tools import tool
from langchain_groq import ChatGroq
from langchain_google_genai import ChatGoogleGenerativeAI
from langchain_nvidia_ai_endpoints import ChatNVIDIA, NVIDIAEmbeddings
from langchain_community.tools.tavily_search import TavilySearchResults
from langchain_community.document_loaders import WikipediaLoader, ArxivLoader, JSONLoader
from langchain_community.vectorstores import FAISS
from langchain.tools.retriever import create_retriever_tool
from langchain_text_splitters import RecursiveCharacterTextSplitter

# Agno imports
from agno.agent import Agent
from agno.models.groq import Groq
from agno.models.google import Gemini
from agno.tools.duckduckgo import DuckDuckGoTools
from agno.memory.agent import AgentMemory
from agno.storage.sqlite import SqliteStorage  # updated per docs

load_dotenv()

# Rate limiter with exponential backoff
class PerformanceRateLimiter:
    def __init__(self, rpm: int, name: str):
        self.rpm = rpm
        self.name = name
        self.times = []
        self.failures = 0

    def wait_if_needed(self):
        now = time.time()
        self.times = [t for t in self.times if now - t < 60]
        if len(self.times) >= self.rpm:
            wait = 60 - (now - self.times[0]) + random.uniform(1, 3)
            time.sleep(wait)
        if self.failures:
            backoff = min(2 ** self.failures, 30) + random.uniform(0.5, 1.5)
            time.sleep(backoff)
        self.times.append(now)

    def record_success(self):
        self.failures = 0

    def record_failure(self):
        self.failures += 1

# initialize limiters
gemini_limiter = PerformanceRateLimiter(28, "Gemini")
groq_limiter   = PerformanceRateLimiter(28, "Groq")
nvidia_limiter = PerformanceRateLimiter(4,  "NVIDIA")

# create Agno agents with SQLite storage
def create_agno_agents():
    storage = SqliteStorage(
        table_name="agent_sessions",
        db_file="tmp/agent_sessions.db",
        auto_upgrade_schema=True
    )
    math_agent = Agent(
        name="MathSpecialist",
        model=GroqChat(
            model="llama-3.3-70b-versatile",
            api_key=os.getenv("GROQ_API_KEY"),
            temperature=0
        ),
        description="Expert mathematical problem solver",
        instructions=[
            "Solve math problems with precision",
            "Show step-by-step calculations",
            "Use calculation tools as needed",
            "Finish with: FINAL ANSWER: [result]"
        ],
        memory=AgentMemory(
            db=storage,
            create_user_memories=True,
            create_session_summary=True
        ),
        show_tool_calls=False,
        markdown=False
    )
    research_agent = Agent(
        name="ResearchSpecialist",
        model=GeminiChat(
            model="gemini-2.0-flash-lite",
            api_key=os.getenv("GOOGLE_API_KEY"),
            temperature=0
        ),
        description="Expert research and information specialist",
        instructions=[
            "Use web and wiki tools to gather data",
            "Synthesize information with clarity",
            "Cite sources and finish with: FINAL ANSWER: [answer]"
        ],
        tools=[DuckDuckGoTools()],
        memory=AgentMemory(
            db=storage,
            create_user_memories=True,
            create_session_summary=True
        ),
        show_tool_calls=False,
        markdown=False
    )
    return {"math": math_agent, "research": research_agent}

@tool
def multiply(a: int, b: int) -> int:
    """Multiply two numbers."""
    return a * b

@tool
def add(a: int, b: int) -> int:
    """Add two numbers."""
    return a + b

@tool
def subtract(a: int, b: int) -> int:
    """Subtract two numbers."""
    return a - b

@tool
def divide(a: int, b: int) -> float:
    """Divide two numbers, raising an error if the divisor is zero."""
    if b == 0:
        raise ValueError("Cannot divide by zero.")
    return a / b

@tool
def modulus(a: int, b: int) -> int:
    """Return the remainder of a divided by b."""
    return a % b
    
@tool
def optimized_web_search(query: str) -> str:
    '''searches the web for results'''
    try:
        time.sleep(random.uniform(1, 2))
        docs = TavilySearchResults(max_results=2).invoke(query=query)
        return "\n\n---\n\n".join(f"<Doc url='{d.get('url','')}'>{d.get('content','')[:500]}</Doc>" for d in docs)
    except Exception as e:
        return f"Web search failed: {e}"

@tool
def optimized_wiki_search(query: str) -> str:
    '''browses the entire wikipedia for a topic'''
    try:
        time.sleep(random.uniform(0.5,1))
        docs = WikipediaLoader(query=query, load_max_docs=1).load()
        return "\n\n---\n\n".join(f"<Doc src='{d.metadata['source']}'>{d.page_content[:800]}</Doc>" for d in docs)
    except Exception as e:
        return f"Wikipedia search failed: {e}"

# FAISS setup
def setup_faiss():
    try:
        schema = """
        { page_content: .Question, metadata: { task_id: .task_id, Final_answer: ."Final answer" } }
        """
        loader = JSONLoader("metadata.jsonl", jq_schema=schema, json_lines=True, text_content=False)
        docs = loader.load()
        split = RecursiveCharacterTextSplitter(chunk_size=256, chunk_overlap=50)
        chunks = split.split_documents(docs)
        embeds = NVIDIAEmbeddings(model="nvidia/nv-embedqa-e5-v5", api_key=os.getenv("NVIDIA_API_KEY"))
        return FAISS.from_documents(chunks, embeds)
    except Exception as e:
        print(f"FAISS setup failed: {e}")
        return None

# state type
class State(TypedDict):
    messages: Annotated[List[HumanMessage|AIMessage], operator.add]
    query: str
    agent_type: str
    final_answer: str
    perf: Dict[str,Any]
    agno_resp: str

class HybridSystem:
    def __init__(self):
        self.agno = create_agno_agents()
        self.store = setup_faiss()
        self.tools = [multiply, add, subtract, divide, modulus, optimized_web_search, optimized_wiki_search]
        if self.store:
            retr = self.store.as_retriever(search_type="similarity", search_kwargs={"k":2})
            self.tools.append(create_retriever_tool(retr, "Question_Search","retrieve similar Qs"))
        self.graph = self._build_graph()
    def _build_graph(self):
        groq = ChatGroq(model="llama-3.3-70b-versatile",temperature=0)
        gem  = ChatGoogleGenerativeAI(model="gemini-2.0-flash-lite",temperature=0)
        nvd  = ChatNVIDIA(model="meta/llama-3.1-70b-instruct",temperature=0)
        def route(st:State)->State:
            q=st["query"].lower()
            if any(w in q for w in ["calculate","math"]): t="lg_math"
            elif any(w in q for w in ["research","analyze"]): t="agno_research"
            elif any(w in q for w in ["what is","who is"]): t="lg_retrieval"
            else: t="agno_general"
            return {**st,"agent_type":t}
        def lg_math(st:State)->State:
            groq_limiter.wait_if_needed()
            t0=time.time()
            llmt=groq.bind_tools([multiply,add,subtract,divide,modulus])
            sys=SystemMessage(content="Calc fast. FINAL ANSWER: [result]")
            res=llmt.invoke([sys,HumanMessage(content=st["query"])])
            return {**st,"final_answer":res.content,"perf":{"time":time.time()-t0,"prov":"LG-Groq"}}
        def agno_research(st:State)->State:
            gemini_limiter.wait_if_needed()
            t0=time.time()
            resp=self.agno["research"].run(st["query"],stream=False)
            return {**st,"final_answer":resp,"perf":{"time":time.time()-t0,"prov":"Agno-Gemini"}}
        def lg_retrieval(st:State)->State:
            groq_limiter.wait_if_needed()
            t0=time.time()
            llmt=groq.bind_tools(self.tools)
            sys=SystemMessage(content="Retrieve fast. FINAL ANSWER: [ans]")
            res=llmt.invoke([sys,HumanMessage(content=st["query"])])
            return {**st,"final_answer":res.content,"perf":{"time":time.time()-t0,"prov":"LG-Retrieval"}}
        def agno_general(st:State)->State:
            nvidia_limiter.wait_if_needed()
            t0=time.time()
            if any(w in st["query"].lower() for w in ["calculate","compute"]):
                resp=self.agno["math"].run(st["query"],stream=False)
            else:
                resp=self.agno["research"].run(st["query"],stream=False)
            return {**st,"final_answer":resp,"perf":{"time":time.time()-t0,"prov":"Agno-Gen"}}
        def pick(st:State)->str: return st["agent_type"]
        g=StateGraph(State)
        g.add_node("router",route)
        g.add_node("lg_math",lg_math)
        g.add_node("agno_research",agno_research)
        g.add_node("lg_retrieval",lg_retrieval)
        g.add_node("agno_general",agno_general)
        g.set_entry_point("router")
        g.add_conditional_edges("router",pick,{
            "lg_math":"lg_math","agno_research":"agno_research","lg_retrieval":"lg_retrieval","agno_general":"agno_general"
        })
        for n in ["lg_math","agno_research","lg_retrieval","agno_general"]:
            g.add_edge(n,"END")
        return g.compile(checkpointer=MemorySaver())
    def process(self,q:str)->Dict[str,Any]:
        st={"messages":[HumanMessage(content=q)],"query":q,"agent_type":"","final_answer":"","perf":{}, "agno_resp":""}
        cfg={"configurable":{"thread_id":f"hybrid_{hash(q)}"}}
        try:
            out=self.graph.invoke(st,cfg)
            return {"answer":out["final_answer"],"perf":out["perf"],"prov":out["perf"].get("prov")}
        except Exception as e:
            return {"answer":f"Error: {e}","perf":{},"prov":"Error"}

def build_graph(provider:str="hybrid"):
    if provider=="hybrid":
        return HybridSystem().graph
    raise ValueError("Only 'hybrid' supported")

# Test
if __name__=="__main__":
    graph=build_graph()
    msgs=[HumanMessage(content="What are the names of the US presidents who were assassinated?")]
    res=graph.invoke({"messages":msgs},{"configurable":{"thread_id":"test"}})
    for m in res["messages"]:
        m.pretty_print()