You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: principal_manager.rs
    path of file: ./repos/enigma-core/enigma-principal/app/src/boot_network
    
    the code of the file until where you have to start completion: use std::{fs::File, io::prelude::*, str, sync::Arc, thread};

use failure::Error;
use rustc_hex::ToHex;
use serde_derive::*;
use serde_json;
use sgx_types::sgx_enclave_
    
    pub fn get_ethereum_address(&self) -> Result<String, Error> {
        if self.config.with_private_key {
            return Ok(self.config.account_address.clone());
        }
        let _signing_address = esgx::equote::get_ethereum_address(self.eid)?;
        let signing_address = _signing_address.to_vec().to_hex();
        Ok(signing_address)
    }