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| from langgraph.graph import StateGraph, START,END, MessagesState | |
| from langgraph.prebuilt import tools_condition,ToolNode | |
| from langchain_core.prompts import ChatPromptTemplate | |
| from src.langgraphagenticai.state.state import State | |
| from src.langgraphagenticai.nodes.basic_chatbot_node import BasicChatbotNode | |
| from src.langgraphagenticai.nodes.chatbot_with_Tool_node import ChatbotWithToolNode | |
| from src.langgraphagenticai.tools.search_tool import get_tools,create_tool_node | |
| class GraphBuilder: | |
| def __init__(self,model): | |
| self.llm=model | |
| self.graph_builder=StateGraph(State) | |
| def basic_chatbot_build_graph(self): | |
| """ | |
| Builds a basic chatbot graph using LangGraph. | |
| This method initializes a chatbot node using the `BasicChatbotNode` class | |
| and integrates it into the graph. The chatbot node is set as both the | |
| entry and exit point of the graph. | |
| """ | |
| self.basic_chatbot_node=BasicChatbotNode(self.llm) | |
| self.graph_builder.add_node("chatbot",self.basic_chatbot_node.process) | |
| self.graph_builder.add_edge(START,"chatbot") | |
| self.graph_builder.add_edge("chatbot",END) | |
| def chatbot_with_tools_build_graph(self): | |
| """ | |
| Builds an advanced chatbot graph with tool integration. | |
| This method creates a chatbot graph that includes both a chatbot node | |
| and a tool node. It defines tools, initializes the chatbot with tool | |
| capabilities, and sets up conditional and direct edges between nodes. | |
| The chatbot node is set as the entry point. | |
| """ | |
| ## Define the tool and tool node | |
| tools=get_tools() | |
| tool_node=create_tool_node(tools) | |
| ##Define LLM | |
| llm = self.llm | |
| # Define chatbot node | |
| obj_chatbot_with_node = ChatbotWithToolNode(llm) | |
| chatbot_node = obj_chatbot_with_node.create_chatbot(tools) | |
| # Add nodes | |
| self.graph_builder.add_node("chatbot", chatbot_node) | |
| self.graph_builder.add_node("tools", tool_node) | |
| # Define conditional and direct edges | |
| self.graph_builder.add_edge(START,"chatbot") | |
| self.graph_builder.add_conditional_edges("chatbot", tools_condition) | |
| self.graph_builder.add_edge("tools","chatbot") | |
| def setup_graph(self, usecase: str): | |
| """ | |
| Sets up the graph for the selected use case. | |
| """ | |
| if usecase == "Basic Chatbot": | |
| self.basic_chatbot_build_graph() | |
| if usecase == "Chatbot with Tool": | |
| self.chatbot_with_tools_build_graph() | |
| return self.graph_builder.compile() | |