stxn.io/careers

```toml
// cargo toml
[dependencies]
tokio = { version = "1", features = ["full"] }
ethers = { version = "2", features = ["contract", "signing"] }
dotenv = "0.15"
```
```rust
//src/main.rs
use ethers::prelude::*;
use ethers::utils::Ganache;
use std::convert::TryFrom;
use std::sync::Arc;
use dotenv::dotenv;
use std::env;

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    // Load environment variables (Ethereum node URLs, private keys, etc.)
    dotenv().ok();
    let provider_url = env::var("ETH_PROVIDER_URL").expect("ETH_PROVIDER_URL must be set");
    let private_key = env::var("PRIVATE_KEY").expect("PRIVATE_KEY must be set");

    // Connect to the Ethereum network
    let provider = Provider::<Http>::try_from(provider_url)?;
    let chain_id = provider.get_chainid().await?;
    let wallet: LocalWallet = private_key.parse::<LocalWallet>()?.with_chain_id(chain_id.as_u64());

    // Create a signer to interact with Ethereum
    let client = SignerMiddleware::new(provider, wallet);
    let client = Arc::new(client);

    // Define a simple solver strategy
    let transaction_context = get_transaction_context().await;
    let result = execute_solver_strategy(client, transaction_context).await?;

    Ok(())
}

// Function to get transaction context (stub)
async fn get_transaction_context() -> TransactionContext {
    // Fetch transaction details, off-chain agent details, etc.
    TransactionContext {
        gas_price: 100,
        priority: true,
    }
}

// A simple struct to hold transaction context
struct TransactionContext {
    gas_price: u64,
    priority: bool,
}

// Solver strategy implementation
async fn execute_solver_strategy<M: Middleware>(
    client: Arc<M>,
    context: TransactionContext,
) -> Result<(), M::Error> {
    // Adjust gas price dynamically based on transaction context
    let gas_price = if context.priority {
        context.gas_price * 2 // For high-priority transactions, double the gas price
    } else {
        context.gas_price
    };

    // Define transaction parameters (e.g., sending ETH)
    let tx = TransactionRequest::new()
        .to("0xRecipientAddressHere")
        .value(1e18 as u64) // Sending 1 ETH
        .gas_price(gas_price);

    // Send the transaction
    let pending_tx = client.send_transaction(tx, None).await?;

    // Await for the transaction to be mined
    let receipt = pending_tx.await?.unwrap();

    println!("Transaction mined in block: {:?}", receipt.block_number);

    Ok(())
}
```