telegram chatbot for crypto transaction (solana) using python: Unexpected Error: argument 'signature': 'str' object cannot be converted to 'Signature'

Question

Python: How to check a Solana transaction and sanitize the transaction ID

I have written a script to fetch transaction details from the Solana blockchain using the solana-py library. It includes sanitization for the transaction ID to ensure it is a valid Base58 string. Here's the code:

from solana.rpc.api import Client  # type: ignore
import re

# Set up your Solana RPC endpoint
SOLANA_RPC_URL = "https://api.mainnet-beta.solana.com"
solana_client = Client(SOLANA_RPC_URL)

# Function to sanitize transaction ID
def sanitize_transaction_id(transaction_id: str) -> str:
    """
    Removes invalid characters from a transaction ID, ensuring it is a valid Base58 string.
    """
    return re.sub(r'[^123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz]', '', transaction_id)

# Function to check a Solana transaction
def check_transaction(transaction_id: str):
    try:
        # Sanitize the transaction ID
        sanitized_transaction_id = sanitize_transaction_id(transaction_id)
        print(f"Raw Transaction ID: {transaction_id}")
        print(f"Sanitized Transaction ID: {sanitized_transaction_id}")

        # Ensure the sanitized transaction ID is 88 characters long
        if len(sanitized_transaction_id) != 88:  # Solana transaction signatures are typically 88 Base58 characters
            raise ValueError("Transaction ID length is invalid.")

        # Fetch the transaction details using the Solana RPC API
        print("Attempting to fetch transaction details...")
        transaction = solana_client.get_transaction(sanitized_transaction_id)  # Pass as Base58 string

        if not transaction or not transaction.get("result"):
            print("Transaction not found or incomplete.")
            return

        print("Transaction details fetched successfully!")
        print(transaction)
    except ValueError as ve:
        print(f"Validation Error: {ve}")
    except Exception as e:
        print(f"Unexpected Error: {e}")

# Example usage
if __name__ == "__main__":
    # Replace with your test transaction ID
    test_transaction_id = "2JNwfJbNmTFkH2YuWWErWTaNpMpbqETguMiLFWqFE6mMy8LiNrf3N9dYZc66NwowybPd1JaE1thTBT36cRx4h7ki"
    check_transaction(test_transaction_id)

Jon C · Accepted Answer · 2025-01-31 18:20:42Z

1

The error here tells you a lot of information: Unexpected Error: argument 'signature': 'str' object cannot be converted to 'Signature'

The get_transaction function is expecting a Signature, but you're passing in a str. So you need to convert your string into a Signature, which you can do by calling:

from solders.signature import Signature

signature = Signature.new_from_str(sanitized_transaction_id)
transaction = solana_client.get_transaction(signature)

Side note: not all signatures will have 88 base-58 characters! So you might want to change that to make sure it has at most 88 characters.

answered Jan 31 at 18:20

Jon C

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1 Comment

rlf89 Apr 26 at 9:43

now it is Signature.from_string(somestring)

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