fn invoke_command()

in projects/web3/eth_wallet/host/src/main.rs [29:58]

• 25 lines of code
• 1 McCabe index (conditional complexity)

fn invoke_command(command: proto::Command, input: &[u8]) -> optee_teec::Result<Vec<u8>> {
    let mut ctx = Context::new()?;
    let uuid = Uuid::parse_str(proto::UUID)
        .map_err(|_| optee_teec::Error::new(optee_teec::ErrorKind::ItemNotFound))?;
    let mut session = ctx.open_session(uuid)?;

    println!("CA: command: {:?}", command);
    // input buffer
    let p0 = ParamTmpRef::new_input(input);
    // output buffer
    let mut output = vec![0u8; OUTPUT_MAX_SIZE];
    let p1 = ParamTmpRef::new_output(output.as_mut_slice());
    // output buffer size
    let p2 = ParamValue::new(0, 0, ParamType::ValueInout);

    let mut operation = Operation::new(0, p0, p1, p2, ParamNone);
    match session.invoke_command(command as u32, &mut operation) {
        Ok(()) => {
            println!("CA: invoke_command success");
            let output_len = operation.parameters().2.a() as usize;
            Ok(output[..output_len].to_vec())
        }
        Err(e) => {
            let output_len = operation.parameters().2.a() as usize;
            let err_message = String::from_utf8_lossy(&output[..output_len]);
            println!("CA: invoke_command failed: {:?}", err_message);
            Err(e)
        }
    }
}