web3 0.3.0

Ethereum JSON-RPC client.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47

//based on examples/contract.rs
extern crate web3;
extern crate rustc_hex;

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

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

  //Get current balance
  let balance = web3.eth().balance(accounts[0], None).wait().unwrap();

  println!("Balance: {}", balance);

  // Get the contract bytecode for instance from Solidity compiler
  let bytecode: Vec<u8> = include_str!("./build/SimpleStorage.bin").from_hex().unwrap();
  // Deploying a contract
  let contract = Contract::deploy(web3.eth(), include_bytes!("./build/SimpleStorage.abi")).unwrap()
    .confirmations(0)
    .poll_interval(time::Duration::from_secs(10))
    .options(Options::with(|opt| opt.gas = Some(3_000_000.into())))
    .execute(bytecode, (), accounts[0])
    .unwrap()
  	.wait()
  	.unwrap();

  println!("{}", contract.address());

  //interact with the contract
  let result = contract.query("get", (), None, Options::default(), None);
  let storage: U256 = result.wait().unwrap();
  println!("{}", storage);

  //Change state of the contract
  contract.call("set", (42,), accounts[0], Options::default());

  //View changes made
  let result = contract.query("get", (), None, Options::default(), None);
  let storage: U256 = result.wait().unwrap();
  println!("{}", storage);
}