Update agent.py

agent.py

@@ -0,0 +1,228 @@
+"""LangGraph Agent"""
+import os
+from dotenv import load_dotenv
+from langgraph.graph import START, StateGraph, MessagesState
+from langgraph.prebuilt import tools_condition
+from langgraph.prebuilt import ToolNode
+from langchain_google_genai import ChatGoogleGenerativeAI
+from langchain_groq import ChatGroq
+from langchain_huggingface import ChatHuggingFace, HuggingFaceEndpoint, HuggingFaceEmbeddings
+from langchain_community.tools.tavily_search import TavilySearchResults
+from langchain_community.document_loaders import WikipediaLoader
+from langchain_community.document_loaders import ArxivLoader
+from langchain_community.vectorstores import SupabaseVectorStore
+from langchain_core.messages import SystemMessage, HumanMessage
+from langchain_core.tools import tool
+from langchain.tools.retriever import create_retriever_tool
+from supabase.client import Client, create_client
+
+from langchain.tools import Tool
+
+
+load_dotenv()
+
+def multiply(a: int, b: int) -> int:
+    return a * b
+
+multiply_tool = Tool(
+    name="multiply",
+    func=multiply,
+    description="Multiply two numbers. Args (a: first int, b: second int)"
+)
+
+def add(a: int, b: int) -> int:
+    return a + b
+
+add_tool = Tool(
+    name="add",
+    func=add,
+    description="Add two numbers. Args (a: first int, b: second int)"
+)
+
+def substract(a: int, b: int) -> int:
+    return a - b
+
+substract_tool = Tool(
+    name="substract",
+    func=substract,
+    description="Substract two numbers. Args (a: first int, b: second int)"
+)
+
+def divide(a: int, b: int) -> int:
+    if b == 0:
+        raise ValueError("Cannot divide by zero.")
+    return a / b
+
+divide_tool = Tool(
+    name="divide",
+    func=divide,
+    description="Divide two numbers. Args (a: first int, b: second int)"
+)
+
+def modulus(a: int, b: int) -> int:
+    return a % b
+    
+modulus_tool = Tool(
+    name="modulus",
+    func=modulus,
+    description="Modulus two numbers. Args (a: first int, b: second int)"
+)
+
+def wiki_search(query: str) -> str:
+    search_docs = WikipediaLoader(query=query, load_max_docs=2).load()
+    formatted_search_docs = "\n\n---\n\n".join(
+        [
+            f'<Document source="{doc.metadata["source"]}" page="{doc.metadata.get("page", "")}"/>\n{doc.page_content}\n</Document>'
+            for doc in search_docs
+        ])
+    return {"wiki_results": formatted_search_docs}
+
+wiki_search_tool = Tool(
+    name="wiki_search",
+    func=wiki_search,
+    description="Search Wikipedia for a query and return maximum 2 results. Args (query: the search query)"
+)
+
+def web_search(query: str) -> str:
+    search_docs = TavilySearchResults(max_results=3).invoke(query=query)
+    formatted_search_docs = "\n\n---\n\n".join(
+        [
+            f'<Document source="{doc.metadata["source"]}" page="{doc.metadata.get("page", "")}"/>\n{doc.page_content}\n</Document>'
+            for doc in search_docs
+        ])
+    return {"web_results": formatted_search_docs}
+    
+web_search_tool = Tool(
+    name="web_search",
+    func=web_search,
+    description="Search Tavily for a query and return maximum 3 results. Args (query: the search query)"
+)
+
+def arvix_search(query: str) -> str:
+    """Search Arxiv for a query and return maximum 3 result.
+    
+    Args:
+        query: The search query."""
+    search_docs = ArxivLoader(query=query, load_max_docs=3).load()
+    formatted_search_docs = "\n\n---\n\n".join(
+        [
+            f'<Document source="{doc.metadata["source"]}" page="{doc.metadata.get("page", "")}"/>\n{doc.page_content[:1000]}\n</Document>'
+            for doc in search_docs
+        ])
+    return {"arvix_results": formatted_search_docs}
+
+arvix_search_tool = Tool(
+    name="arvix_search",
+    func=arvix_search,
+    description="Search Arxiv for a query and return maximum 3 result. Args (query: the search query)"
+)
+
+
+# load the system prompt from the file
+with open("system_prompt.txt", "r", encoding="utf-8") as f:
+    system_prompt = f.read()
+
+# System message
+sys_msg = SystemMessage(content=system_prompt)
+
+tools = [
+    multiply_tool,
+    add_tool,
+    substract_tool,
+    divide_tool,
+    modulus_tool,
+    wiki_search_tool,
+    web_search_tool,
+    arvix_search_tool,
+]
+
+# Build graph function
+def build_graph(provider: str = "google"):
+    """Build the graph"""
+    # Load environment variables from .env file
+    if provider == "google":
+        # Google Gemini
+        chat = ChatGoogleGenerativeAI(model="gemini-2.0-flash", temperature=0)
+    elif provider == "groq":
+        # Groq https://console.groq.com/docs/models
+        chat = ChatGroq(model="qwen-qwq-32b", temperature=0) # optional : qwen-qwq-32b gemma2-9b-it
+    elif provider == "huggingface":
+        # TODO: Add huggingface endpoint
+        chat = ChatHuggingFace(
+            llm=HuggingFaceEndpoint(
+                url="https://api-inference.huggingface.co/models/Meta-DeepLearning/llama-2-7b-chat-hf",
+                temperature=0,
+            ),
+        )
+    else:
+        raise ValueError("Invalid provider. Choose 'google', 'groq' or 'huggingface'.")
+    # Bind tools to LLM
+    chat_with_tools = chat.bind_tools(tools)
+
+    # Node
+    def assistant(state: MessagesState):
+        """Assistant node"""
+        return {"messages": [llm_with_tools.invoke(state["messages"])]}
+    
+    # def retriever(state: MessagesState):
+      #  """Retriever node"""
+       # similar_question = vector_store.similarity_search(state["messages"][0].content)
+        #example_msg = HumanMessage(
+         #   content=f"Here I provide a similar question and answer for reference: \n\n{similar_question[0].page_content}",
+       # )
+       # return {"messages": [sys_msg] + state["messages"] + [example_msg]}
+
+    from langchain_core.messages import AIMessage
+
+    def retriever(state: MessagesState):
+        query = state["messages"][-1].content
+        similar_doc = vector_store.similarity_search(query, k=1)[0]
+
+        content = similar_doc.page_content
+        if "Final answer :" in content:
+            answer = content.split("Final answer :")[-1].strip()
+        else:
+            answer = content.strip()
+
+        return {"messages": [AIMessage(content=answer)]}
+
+   # builder = StateGraph(MessagesState)
+    #builder.add_node("retriever", retriever)
+    #builder.add_node("assistant", assistant)
+    #builder.add_node("tools", ToolNode(tools))
+    #builder.add_edge(START, "retriever")
+    #builder.add_edge("retriever", "assistant")
+    #builder.add_conditional_edges(
+     #   "assistant",
+      #  tools_condition,
+    #)
+    #builder.add_edge("tools", "assistant")
+
+    #builder = StateGraph(MessagesState)
+    #builder.add_node("retriever", retriever)
+
+    # Retriever ist Start und Endpunkt
+    #builder.set_entry_point("retriever")
+    #builder.set_finish_point("retriever")
+
+    # Compile graph
+    #return builder.compile()
+
+
+
+    builder = StateGraph(MessagesState)
+    # Define nodes: these do the work
+    builder.add_node("assistant", assistant)
+    builder.add_node("tools", ToolNode(tools))
+    # Define edges: these determine how the control flow moves
+    builder.add_edge(START, "assistant")
+    builder.add_conditional_edges(
+        "assistant",
+        # If the latest message requires a tool, route to tools
+        # Otherwise, provide a direct response
+        tools_condition,
+    )
+    builder.add_edge("tools", "assistant")
+
+    # Compile graph
+    return builder.compile()