web3 0.3.0

Ethereum JSON-RPC client.
Documentation 
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extern crate web3;
extern crate rustc_hex;

use web3::futures::Future;
use web3::contract::{Contract, Options};
use web3::types::{Address, U256};
use rustc_hex::FromHex;

fn main() {
  let (_eloop, http) = web3::transports::Http::new("http://localhost:8545").unwrap();
  let web3 = web3::Web3::new(http);

  let my_account: Address = "0x00a329c0648769a73afac7f9381e08fb43dbea72".parse().unwrap();
  // Get the contract bytecode for instance from Solidity compiler
  let bytecode: Vec<u8> = include_str!("./contract_token.code").from_hex().unwrap();
  // Deploying a contract
  let contract = Contract::deploy(web3.eth(), include_bytes!("../src/contract/res/token.json")).unwrap()
      .confirmations(4)
      .options(Options::with(|opt| opt.value = Some(5.into())))
      .execute(bytecode, (
          U256::from(1_000_000),
          "My Token".to_owned(),
          3u64,
          "MT".to_owned()
      ), my_account)
      .expect("Correct parameters are passed to the constructor.")
      .wait()
      .unwrap();

  let result = contract.query("balanceOf", (my_account, ), None, Options::default(), None);
  let balance_of: U256 = result.wait().unwrap();
  assert_eq!(balance_of, 1_000_000.into());

  // Accessing existing contract
  let contract_address = contract.address();
  let contract = Contract::from_json(
    web3.eth(),
    contract_address,
    include_bytes!("../src/contract/res/token.json")
  ).unwrap();

  let result = contract.query("balanceOf", (my_account, ), None, Options::default(), None);
  let balance_of: U256 = result.wait().unwrap();
  assert_eq!(balance_of, 1_000_000.into());
}