code_assistant_runnable.py

from langchain_openai import ChatOpenAI
from langchain_ollama import ChatOllama
from langchain_groq import ChatGroq
from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver

from langchain.text_splitter import RecursiveCharacterTextSplitter
from langchain_community.document_loaders import WebBaseLoader
# from langchain_community.vectorstores import Chroma
from langchain_chroma import Chroma

from langchain_community.embeddings import HuggingFaceBgeEmbeddings
import pickle

from langchain_core.prompts import ChatPromptTemplate
from langchain_openai import ChatOpenAI
from pydantic import BaseModel, Field

from typing import List
from typing_extensions import TypedDict
from langgraph.graph import END, StateGraph, START

import subprocess
import time
import re
import json
import os
from dotenv import load_dotenv


load_dotenv()


# Add after your imports
os.environ["TOKENIZERS_PARALLELISM"] = "false"

# llm = ChatOllama(model="codestral")
expt_llm = "gpt-4o-mini"
llm = ChatOpenAI(temperature=0, model=expt_llm)

## Create retrieval from existing store

# Load the existing vectorstore

# Load an existing (saved) embedding model from a pickle file

# model_path = "/Model/embedding_model.pkl"
model_path = "embedding_model.pkl"
with open(model_path, 'rb') as f:
    embedding_model = pickle.load(f)

print("Loaded embedding model successfully")

vectorstore = Chroma(
    collection_name="solcoder-chroma",
    embedding_function=embedding_model,
    persist_directory="solcoder-db"
)

retriever = vectorstore.as_retriever()


# Grader prompt
code_gen_prompt = ChatPromptTemplate(
    [
        (
            "system",
            """<instructions> You are a coding assistant with expertise in Solana Blockchain ecosystem. \n 
    Here is a set of Solana development documentation based on a user question:  \n ------- \n  {context} \n ------- \n 
    Answer the user  question based on the above provided documentation. Ensure any code you provide can be executed with all required imports and variables \n
    defined. Structure your answer: 1) a prefix describing the code solution, 2) the imports, 3) the functioning code block. \n
    Invoke the code tool to structure the output correctly. </instructions> \n Here is the user question:""",
        ),
        ("placeholder", "{messages}"),
    ]
)


# Data model
class code(BaseModel):
    """Schema for code solutions to questions about Solana development."""

    prefix: str = Field(description="Description of the problem and approach")
    imports: str = Field(description="Code block import statements")
    code: str = Field(description="Code block not including import statements")
    language: str = Field(description="programming language the code is implemented")

    class Config:
        json_schema_extra = {
            "example": {
                "prefix": "To read the balance of an account from the Solana network, you can use the `@solana/web3.js` library.",
                "imports": 'import { clusterApiUrl, Connection, PublicKey, LAMPORTS_PER_SOL,} from "@solana/web3.js";',
                "code":"""const connection = new Connection(clusterApiUrl("devnet"), "confirmed");
                            const wallet = new PublicKey("nicktrLHhYzLmoVbuZQzHUTicd2sfP571orwo9jfc8c");
                            
                            const balance = await connection.getBalance(wallet);
                            console.log(`Balance: ${balance / LAMPORTS_PER_SOL} SOL`);""",
                "language":"typescript"

            }
        }


# expt_llm = "codestral"
# llm = ChatOllama(temperature=0, model=expt_llm)


# Post-processing
def format_docs(docs):
    return "\n\n".join(doc.page_content for doc in docs)



structured_llm = code_gen_prompt | llm.with_structured_output(code, include_raw=True)

# Optional: Check for errors in case tool use is flaky
def check_llm_output(tool_output):
    """Check for parse error or failure to call the tool"""

    # Error with parsing
    if tool_output["parsing_error"]:
        # Report back output and parsing errors
        print("Parsing error!")
        raw_output = str(tool_output["raw"].content)
        error = tool_output["parsing_error"]
        raise ValueError(
            f"Error parsing your output! Be sure to invoke the tool. Output: {raw_output}. \n Parse error: {error}"
        )

    # Tool was not invoked
    elif not tool_output["parsed"]:
        print("Failed to invoke tool!")
        raise ValueError(
            "You did not use the provided tool! Be sure to invoke the tool to structure the output."
        )
    return tool_output


# Chain with output check
code_chain_raw = (
    code_gen_prompt | structured_llm | check_llm_output
)

def insert_errors(inputs):
    """Insert errors for tool parsing in the messages"""

    # Get errors
    error = inputs["error"]
    messages = inputs["messages"]
    messages += [
        (
            "assistant",
            f"Retry. You are required to fix the parsing errors: {error} \n\n You must invoke the provided tool.",
        )
    ]
    return {
        "messages": messages,
        "context": inputs["context"],
    }


# This will be run as a fallback chain
fallback_chain = insert_errors | code_chain_raw

N = 3  # Max re-tries

code_gen_chain_re_try = code_chain_raw.with_fallbacks(
    fallbacks=[fallback_chain] * N, exception_key="error"
)


def parse_output(solution):
    """When we add 'include_raw=True' to structured output,
    it will return a dict w 'raw', 'parsed', 'parsing_error'."""

    return solution["parsed"]

# Optional: With re-try to correct for failure to invoke tool
code_gen_chain = code_gen_chain_re_try | parse_output

# No re-try
# code_gen_chain = code_gen_prompt | structured_llm | parse_output


### Create State

class GraphState(TypedDict):
    """
    Represents the state of our graph.

    Attributes:
        error : Binary flag for control flow to indicate whether test error was tripped
        messages : With user question, error messages, reasoning
        generation : Code solution
        iterations : Number of tries
    """

    error: str
    messages: List
    generation: List
    iterations: int

### HELPER FUNCTIONS

def check_node_typescript_installation():
    """Check if Node.js and TypeScript are properly installed"""
    try:
        # Check Node.js
        node_version = subprocess.run(["node", "--version"], 
                                   capture_output=True, 
                                   text=True)
        if node_version.returncode != 0:
            return False, "Node.js is not installed or not in PATH"
        
        # Check TypeScript
        tsc_version = subprocess.run(["npx", "tsc", "--version"], 
                                  capture_output=True, 
                                  text=True)
        if tsc_version.returncode != 0:
            return False, "TypeScript is not installed. Please run 'npm install -g typescript'"
        
        return True, "Environment OK"
    except Exception as e:
        return False, f"Error checking environment: {str(e)}"

def create_temp_package_json():
    """Create a temporary package.json file for Node.js execution"""
    package_json = {
        "name": "temp-code-execution",
        "version": "1.0.0",
        "type": "module",
        "dependencies": {
            "typescript": "^4.9.5"
        }
    }
    with open("package.json", "w") as f:
        json.dump(package_json, f)

def run_javascript_code(code, is_typescript=False):
    """Execute JavaScript or TypeScript code using Node.js"""
    # Check environment first
    env_ok, env_message = check_node_typescript_installation()
    if not env_ok:
        return f"Environment Error: {env_message}"
    try:
        # Create necessary files
        create_temp_package_json()
        
        if is_typescript:
            # For TypeScript, we need to compile first
            with open("temp_code.ts", "w") as f:
                f.write(code)
            
            # Compile TypeScript
            compile_process = subprocess.run(
                ["npx", "tsc", "temp_code.ts", "--module", "ES2020", "--target", "ES2020"],
                capture_output=True,
                text=True
            )

            
            # if compile_process.returncode != 0:
            #     return f"TypeScript Compilation Error:\n{compile_process.stderr}"
            
            return compile_process
            
            # Run compiled JavaScript
            file_to_run = "temp_code.js"
        else:
            # For JavaScript, write directly to .js file
            with open("temp_code.js", "w") as f:
                f.write(code)
            file_to_run = "temp_code.js"
        
        # Execute the code using Node.js
        result = subprocess.run(
            ["node", file_to_run],
            capture_output=True,
            text=True
        )
        
        # Clean up temporary files
        cleanup_files = ["temp_code.js", "temp_code.ts", "package.json"]
        for file in cleanup_files:
            if os.path.exists(file):
                os.remove(file)
        
        # return result.stderr if result.stderr else result.stdout
        return result
    
    except Exception as e:
        return f"Error: {e}"
    
def run_rust_code(code):
    with open('code.rs', 'w') as file:
        file.write(code)
    
    compile_process = subprocess.Popen(['rustc', 'code.rs'], 
                                     stdout=subprocess.PIPE, 
                                     stderr=subprocess.PIPE, 
                                     text=True)
    compile_output, compile_errors = compile_process.communicate()
    
    if compile_process.returncode != 0:
        return f"Compilation Error: {compile_errors}"
    
    run_process = subprocess.Popen(['./code'], 
                                 stdout=subprocess.PIPE, 
                                 stderr=subprocess.PIPE, 
                                 text=True)
    run_output, run_errors = run_process.communicate()
    return run_output if not run_errors else run_errors


### Parameter

# Max tries
max_iterations = 3

# Reflect
# flag = 'reflect'
flag = "do not reflect"

### Nodes


def generate(state: GraphState):
    """
    Generate a code solution

    Args:
        state (dict): The current graph state

    Returns:
        state (dict): New key added to state, generation
    """

    print("---GENERATING CODE SOLUTION---")

    # State
    messages = state["messages"]
    iterations = state["iterations"]
    error = state["error"]

    question = state['messages'][-1][1]

    # We have been routed back to generation with an error
    if error == "yes":
        messages += [
            (
                "user",
                "Now, try again. Invoke the code tool to structure the output with a prefix, imports, and code block:",
            )
        ]

    # Post-processing
    def format_docs(docs):
        return "\n\n".join(doc.page_content for doc in docs)

    retrieved_docs = retriever.invoke(question)
    formated_docs = format_docs(retrieved_docs)
    

    # Solution
    code_solution = code_gen_chain.invoke(
        {"context": formated_docs, "messages": messages}
    )
    messages += [
        (
            "assistant",
            f"{code_solution.prefix} \n Imports: {code_solution.imports} \n Code: {code_solution.code}",
        )
    ]

    # Increment
    iterations = iterations + 1
    return {"generation": code_solution, "messages": messages, "iterations": iterations}


def code_check(state: GraphState):
    """
    Check code

    Args:
        state (dict): The current graph state

    Returns:
        state (dict): New key added to state, error
    """

    print("---CHECKING CODE---")

    # State
    messages = state["messages"]
    code_solution = state["generation"]
    iterations = state["iterations"]

    # Get solution components
    imports = code_solution.imports
    code = code_solution.code
    language = code_solution.language

    if language.lower()=="python":


        # Check imports
        try:
            exec(imports)
        except Exception as e:
            print("---CODE IMPORT CHECK: FAILED---")
            error_message = [("user", f"Your solution failed the import test: {e}")]
            messages += error_message
            return {
                "generation": code_solution,
                "messages": messages,
                "iterations": iterations,
                "error": "yes",
            }

        # Check execution
        try:
            exec(imports + "\n" + code)
        except Exception as e:
            print("---CODE BLOCK CHECK: FAILED---")
            error_message = [("user", f"Your solution failed the code execution test: {e}")]
            messages += error_message
            return {
                "generation": code_solution,
                "messages": messages,
                "iterations": iterations,
                "error": "yes",
            }
        
    if language.lower()=="javascript":

        full_code = imports + "\n" + code


        result = run_javascript_code(full_code, is_typescript=False)

        if result.stderr:
            print("---JS CODE BLOCK CHECK: FAILED---")
            print(f"This is the error:{result.stderr}")
            error_message = [("user", f"Your javascript solution failed the code execution test: {result.stderr}")]
            messages += error_message
            return {
                "generation": code_solution,
                "messages": messages,
                "iterations": iterations,
                "error": "yes",
            }
    


    if language.lower()=="typescript":

        full_code = imports + "\n" + code


        result = run_javascript_code(full_code, is_typescript=True)

        if result.stderr:
            print("---TS CODE BLOCK CHECK: FAILED---")
            print(f"This is the error:{result.stderr}")
            error_message = [("user", f"Your typesript solution failed the code execution test: {result.stderr}")]
            messages += error_message
            return {
                "generation": code_solution,
                "messages": messages,
                "iterations": iterations,
                "error": "yes",
            }


    if language.lower()=="rust":

        full_code = imports + "\n" + code

        with open('code.rs', 'w') as file:
            file.write(full_code)
        
        compile_process = subprocess.Popen(['rustc', 'code.rs'], 
                                        stdout=subprocess.PIPE, 
                                        stderr=subprocess.PIPE, 
                                        text=True)
        compile_output, compile_errors = compile_process.communicate()
        
        if compile_process.stderr:
            # return f"Compilation Error: {compile_errors}"
            print("---RUST CODE BLOCK CHECK: COMPILATION FAILED---")
            print(f"This is the error:{compile_process.stderr}")
            error_message = [("user", f"Your rust solution failed the code compilation test: {compile_process.stderr}")]
            messages += error_message
            return {
                "generation": code_solution,
                "messages": messages,
                "iterations": iterations,
                "error": "yes",
            }
        
        run_process = subprocess.Popen(['./code'], 
                                    stdout=subprocess.PIPE, 
                                    stderr=subprocess.PIPE, 
                                    text=True)
        run_output, run_errors = run_process.communicate()
        

        if run_process.stderr:
            print("---RUST CODE BLOCK CHECK: RUN FAILED---")
            print(f"This is the error:{run_errors}")
            error_message = [("user", f"Your rust solution failed the code run test: {run_errors}")]
            messages += error_message
            return {
                "generation": code_solution,
                "messages": messages,
                "iterations": iterations,
                "error": "yes",
            }
        # return run_output if not run_errors else run_errors
        

    elif language.lower() not in ["rust", "python", "typescript", "javascript"]:

        # Can't test the code
        print("---CANNOT TEST CODE: CODE NOT IN EXPECTED LANGUAGE---")
        
        return {
            "generation": code_solution,
            "messages": messages,
            "iterations": iterations,
            "error": "no",
        }



    # No errors
    print("---NO CODE TEST FAILURES---")
    return {
        "generation": code_solution,
        "messages": messages,
        "iterations": iterations,
        "error": "no",
    }


def reflect(state: GraphState):
    """
    Reflect on errors

    Args:
        state (dict): The current graph state

    Returns:
        state (dict): New key added to state, generation
    """

    print("---REFLECTING ON CODE SOLUTION ERRORS---")

    # State
    messages = state["messages"]
    iterations = state["iterations"]
    code_solution = state["generation"]
    question = state['messages'][-1][1]

    # Prompt reflection

    # Post-processing
    def format_docs(docs):
        return "\n\n".join(doc.page_content for doc in docs)

    retrieved_docs = retriever.invoke(question)
    formated_docs = format_docs(retrieved_docs)

    # Add reflection
    reflections = code_gen_chain.invoke(
        {"context": formated_docs, "messages": messages}
    )
    
    messages += [("assistant", f"Here are reflections on the error: {reflections}")]
    return {"generation": code_solution, "messages": messages, "iterations": iterations}


### Edges


def decide_to_finish(state: GraphState):
    """
    Determines whether to finish.

    Args:
        state (dict): The current graph state

    Returns:
        str: Next node to call
    """
    error = state["error"]
    iterations = state["iterations"]

    if error == "no" or iterations == max_iterations:
        print("---DECISION: FINISH---")
        return "end"
    else:
        print("---DECISION: RE-TRY SOLUTION---")
        if flag == "reflect":
            return "reflect"
        else:
            return "generate"
        


def get_runnable():
    workflow = StateGraph(GraphState)

    # Define the nodes
    workflow.add_node("generate", generate)  # generation solution
    workflow.add_node("check_code", code_check)  # check code
    workflow.add_node("reflect", reflect)  # reflect

    # Build graph
    workflow.add_edge(START, "generate")
    workflow.add_edge("generate", "check_code")
    workflow.add_conditional_edges(
        "check_code",
        decide_to_finish,
        {
            "end": END,
            "reflect": "reflect",
            "generate": "generate",
        },
    )
    workflow.add_edge("reflect", "generate")

    # Remove the checkpointer for now since it's causing issues
    code_assistant_app = workflow.compile()

    #     memory = AsyncSqliteSaver.from_conn_string(":memory:")

#     code_assistant_app = workflow.compile(checkpointer=memory)

    return code_assistant_app

# if __name__ == "__main__":
#     graph = get_runnable()
#     prompt = "How do I read from the solana network?"
#     print(f'{graph.invoke({"messages": [("user", prompt)], "iterations": 0, "error": ""})}')