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Run an ewasm smart contract
Next generation Ethereum smart contracts at your finger tip
One of the key features of the Second State DevChain is its support for the next-gen Ethereum virtual machine, Ewasm. Smart contracts compiled to Ewasm can be deployed on the DevChain.
Run a ERC20 EWASM smart contract now!
Before you start, please make sure that you have a Second State DevChain up and running. If not, follow the Getting Started tutorial. It takes about 10 minutes.
You can use the SOLL compiler to compile Solidity or YUL source code to Ewasm bytecode. Follow the instructions here. The Solidity source code the smart contract is as follows. It is a simplified ERC20 contract.
1
pragma solidity ^0.5.0;
2
contract Token {
3
uint256 private totalSupply;
4
string public name;
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string public symbol;
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mapping(address => uint256) public balances;
7
​
8
event Transfer(address indexed _from, address indexed _to, uint256 _value);
9
​
10
// Safemath
11
function add(uint256 a, uint256 b) internal pure returns (uint256) {
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uint256 c = a + b;
13
require(c >= a, "SafeMath: addition overflow");
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​
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return c;
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}
17
​
18
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
19
require(b <= a, "SafeMath: subtraction overflow");
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uint256 c = a - b;
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​
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return c;
23
}
24
​
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constructor() public {
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totalSupply = 100000000;
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name = "ERC20TokenDemo";
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symbol = "ETD";
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balances[msg.sender] = totalSupply;
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}
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​
32
function balanceOf(address account) view public returns (uint256) {
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return balances[account];
34
}
35
​
36
function transfer(address to, uint256 amount) public returns (bool) {
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balances[msg.sender] = sub(balances[msg.sender], amount);
38
balances[to] = add(balances[to], amount);
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emit Transfer(msg.sender, to, amount);
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return true;
41
}
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​
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function () external payable {}
44
}
Copied!
The compiled ewasm bytecode is converted to text using the
xxd tool.1
$ xxd -p contract.wasm | tr -d #x27;\n'
2
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Copied!
Now, let's prefix the ewasm code with
0x and deploy it to the blockchain from the default coinbase address. Recall that the default passphrase for the coinbase is 1234. All you need is an address that has some CMTs in it.1
> personal.unlockAccount("0x7eff122b94897ea5b0e2a9abf47b86337fafebdc")
2
Passphrase:
3
> cmt.sendTransaction({
4
from: "0x7eff122b94897ea5b0e2a9abf47b86337fafebdc",
5
gas: 5000000,
6
data: 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7
})
8
"0x008d8ab4d995cdef95fcc61b0d009470b7a69f6b3d37e0d76734bcacf62319fe"
Copied!
Note the return value from the
sendTransaction is the transaction hash. We can use it to find the address of the newly created contract.1
// USE THE TX HASH FROM ABOVE
2
> cmt.getTransactionReceipt("0x008d8ab4d995cdef95fcc61b0d009470b7a69f6b3d37e0d76734bcacf62319fe")
3
{
4
blockHash: "0xff8aabe3b70ea6796cc1b945b10d717d462ae24c49f8e05dbec2dc2f4511790f",
5
blockNumber: 27978,
6
contractAddress: "0x70f94d58cc3fdcbeac7140f35a087da9fcd09b94",
7
cumulativeGasUsed: 1519352,
8
from: "0x7eff122b94897ea5b0e2a9abf47b86337fafebdc",
9
gasUsed: 1519352,
10
logs: [],
11
logsBloom: "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
12
status: "0x1",
13
to: null,
14
transactionHash: "0x8b102fb7744f3472328131f921efdbad3a9ef3c6225c682196ad2a3a8bb34a6e",
15
transactionIndex: 0
16
}
17
// SET THE CONTRACT ADDRESS
18
> contractAddress = "0x70f94d58cc3fdcbeac7140f35a087da9fcd09b94"
Copied!
Next, create an instance of this contract at the above address. You will need the ABI for this contract (based on the Solidity source code) for this to work. Then, we can query the account balances in this ERC20 token contract. The creator address of this contact has all the initial supply of the tokens, and everyone else is zero.
1
> abi = [{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"constant":true,"inputs":[{"name":"account","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"}]
2
> contract = cmt.contract(abi);
3
> contractInstance = contract.at(contractAddress);
4
> contractInstance.balanceOf.call("0x7eff122b94897ea5b0e2a9abf47b86337fafebdc");
5
100000000
6
> contractInstance.balanceOf.call("0x77beb894fc9b0ed41231e51f128a347043960a9d");
7
0
Copied!
Finally, we can make
transfer calls on the contract to transfer ERC20 tokens between accounts.1
> contractInstance.transfer.sendTransaction(
2
"0x77beb894fc9b0ed41231e51f128a347043960a9d",
3
123,
4
{
5
from: "0x7eff122b94897ea5b0e2a9abf47b86337fafebdc",
6
gas: 5000000
7
}
8
);
9
> contractInstance.balanceOf.call("0x7eff122b94897ea5b0e2a9abf47b86337fafebdc");
10
99999877
11
> contractInstance.balanceOf.call("0x77beb894fc9b0ed41231e51f128a347043960a9d");
12
123
Copied!
That's it. You have now deployed and executed an ewasm smart contract on a real blockchain. Welcome to the future of Ethereum!
Last modified 1yr ago
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