add deploy_erc20 script

scripts/deploy_erc20.js

@@ -0,0 +1,46 @@
+const ethers = require("ethers");
+const mnemonic = "test test test test test test test test test test test junk";
+
+async function main() {
+  // First provider account.
+  const mintAddress = process.env.MINT_TO;
+  const mintAmount = process.env.MINT_AMOUNT;
+  const name = process.env.TOKEN_NAME;
+  const symbol = process.env.TOKEN_SYMBOL;
+
+  const IERC20 = artifacts.require("IERC20");
+  const tokenAddress = await deployContract("SimpleToken", name, symbol, mintAmount);
+  let token = new IERC20(tokenAddress);
+  await token.transfer(mintAddress, mintAmount);
+  console.log("mint token to ", mintAddress, mintAmount);
+}
+
+module.exports = (callback) => {
+  main().then(callback).catch(e => {
+    console.log("Error:", e.message, e);
+    callback();
+  });
+};
+
+function timeout(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms));
+}
+
+async function deployContract(contractName, ...args) {
+  const provider = new ethers.providers.JsonRpcProvider(process.env.AXON_HTTP_RPC_URL);
+  const signer = new ethers.Wallet.fromMnemonic(mnemonic).connect(provider);
+  const contract = artifacts.require(contractName); // load contract from json
+  const abi = new ethers.utils.Interface(contract.abi);
+  const factory = new ethers.ContractFactory(abi, contract.bytecode, signer);
+  const contractInstance = await factory.deploy(...args);
+
+  // wait getCode
+  let code = await provider.getCode(contractInstance.address);
+  while (code == '0x') {
+    console.log("failed to fetch code of ", contractName, contractInstance.address, " retrying");
+    await timeout(1000);
+    code = await provider.getCode(contractInstance.address);
+  }
+  console.log("Done Deployment " + contractName + " at " + contractInstance.address);
+  return contractInstance.address;
+}