Contractless/src/bin/lookup_contract_by_hash.rs

use blockchain::common::cli_prompts::{prompt_hidden_nonempty, prompt_wallet_path};
use blockchain::common::network_startup::get_connections;
use blockchain::encode;
use blockchain::env;
use blockchain::json;
use blockchain::records::memory::response_channels::generate_uid;
use blockchain::standalone_tools::connections::handshake;

#[tokio::main]
async fn main() {
    // Command 33 asks a peer for one loan contract by its 32-byte hash.
    let hashmap_key = generate_uid();
    let rpc_command = 33;

    // The hash is passed as text here and encoded into binary request bytes later.
    let args: Vec<String> = env::args().collect();
    if args.len() != 2 {
        println!("Usage: ./contract_lookup_by_hash <contract_hash>");
        return;
    }

    let contract_hash = match args[1].parse::<String>() {
        Ok(hash) => hash,
        Err(_) => {
            println!("Please enter a contract hash");
            return;
        }
    };
    let wallet_path = prompt_wallet_path().await;

    let encryption_key = prompt_hidden_nonempty(
        "What is your wallet decryption key? ",
        "Wallet key cannot be empty. Please try again.",
    )
    .await;

    // Try each configured peer until one returns a response.
    let connections = get_connections().await;
    let mut connected = false;

    for conn in connections {
        if connected {
            break;
        }

        let socket_address = conn.parse().expect("Failed to parse the socket address");
        let result = handshake::connect_and_handshake(
            socket_address,
            contract_hash.clone(),
            rpc_command,
            handshake::HandshakeWallet::WalletKey {
                encryption_key: encryption_key.clone(),
                wallet_path: wallet_path.clone(),
            },
            hashmap_key,
        )
        .await;

        match result {
            Ok(response) => {
                // Contract lookup replies are usually text; fallback to hex if the peer sends raw bytes.
                let response_text = String::from_utf8_lossy(&response);
                let trimmed = response_text.trim();
                if !trimmed.is_empty() {
                    println!("{trimmed}");
                    connected = true;
                } else if !response.is_empty() {
                    println!(
                        "{}",
                        serde_json::to_string_pretty(&json!({ "hex": encode(response) })).unwrap()
                    );
                    connected = true;
                }
            }
            Err(_) => {
                connected = false;
            }
        }
    }

    if !connected {
        eprintln!("failed to connect");
    }
}