#9: try

Author: yegor256

Gemfile

@@ -24,7 +24,6 @@ source 'https://rubygems.org'
 gemspec
 
 gem 'donce', '>0', require: false
-gem 'eth', '>0', require: false
 gem 'loog', '>0', require: false
 gem 'minitest', '5.25.4', require: false
 gem 'minitest-reporters', '1.7.1', require: false

Gemfile.lock

@@ -3,6 +3,7 @@ PATH
   specs:
     erc20 (0.0.0)
       backtrace (> 0)
+      eth (~> 0.4)
       jsonrpc-client (> 0)
       tago (> 0)
 
@@ -262,7 +263,6 @@ PLATFORMS
 DEPENDENCIES
   donce (> 0)
   erc20!
-  eth (> 0)
   loog (> 0)
   minitest (= 5.25.4)
   minitest-reporters (= 1.7.1)

erc20.gemspec

@@ -40,6 +40,7 @@ Gem::Specification.new do |s|
   s.rdoc_options = ['--charset=UTF-8']
   s.extra_rdoc_files = ['README.md', 'LICENSE.txt']
   s.add_dependency 'backtrace', '>0'
+  s.add_dependency 'eth', '~>0.4'
   s.add_dependency 'jsonrpc-client', '>0'
   s.add_dependency 'tago', '>0'
   s.metadata['rubygems_mfa_required'] = 'true'

hardhat/.gitignore

@@ -2,3 +2,4 @@ artifacts/
 cache/
 node_modules/
 ignition/deployments/
+package-lock.json

hardhat/contracts/Foo.sol

@@ -26,8 +26,8 @@ contract Foo {
     constructor() {
         owner = msg.sender;
         _mint(owner, 100000);
-        _mint(0xd5fF1bFCDE7A03Da61ad229d962c74F1eA2f16A5, 123000); // Jeff
-        _mint(0xd7a63Ac9DD3d7878bc042A4bADA214EE4aff8c85, 456000); // Walter
+        _mint(0xd5fF1bFCDE7A03Da61ad229d962c74F1eA2f16A5, 123000000000); // Jeff
+        _mint(0xd7a63Ac9DD3d7878bc042A4bADA214EE4aff8c85, 456000000000); // Walter
     }
 
     function balanceOf(address account) external view returns (uint256) {
@@ -55,7 +55,6 @@ contract Foo {
     ) external returns (bool) {
         uint256 currentAllowance = _allowances[sender][msg.sender];
         require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
-
         _approve(sender, msg.sender, currentAllowance - amount);
         _transfer(sender, recipient, amount);
 
@@ -71,10 +70,8 @@ contract Foo {
         require(sender != address(0), "ERC20: transfer from the zero address");
         require(recipient != address(0), "ERC20: transfer to the zero address");
         require(_balances[sender] >= amount, "ERC20: transfer amount exceeds balance");
-
         _balances[sender] -= amount;
         _balances[recipient] += amount;
-
         emit Transfer(sender, recipient, amount);
     }
 
@@ -85,14 +82,12 @@ contract Foo {
     ) internal {
         require(tokenOwner != address(0), "ERC20: approve from the zero address");
         require(spender != address(0), "ERC20: approve to the zero address");
-
         _allowances[tokenOwner][spender] = amount;
         emit Approval(tokenOwner, spender, amount);
     }
 
     function _mint(address account, uint256 amount) internal {
         require(account != address(0), "ERC20: mint to the zero address");
-
         totalSupply += amount;
         _balances[account] += amount;
         emit Transfer(address(0), account, amount);

hardhat/hardhat.config.js

@@ -26,7 +26,19 @@ module.exports = {
   solidity: "0.8.28",
   defaultNetwork: "foo",
   networks: {
+    hardhat: {
+      chainId: 4242,
+      gas: 10,
+      gasPrice: 4,
+      maxFeePerGas: 100,
+      maxPriorityFeePerGas: 100,
+      initialBaseFeePerGas: 100,
+      accounts: {
+        count: 1
+      }
+    },
     foo: {
+      chainId: 4242,
       url: "http://HOST:PORT"
     }
   }

lib/erc20/wallet.rb

@@ -20,6 +20,7 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
+require 'eth'
 require 'jsonrpc/client'
 require_relative '../erc20'
 
@@ -58,13 +59,33 @@ def balance(hex)
 
   # Send a single payment from a private address to a public one.
   #
-  # @param [String] _sender Private key, in hex
-  # @param [String] _receiver Public key, in hex
-  # @param [Integer] _amount The amount to send
+  # @param [String] priv Private key, in hex
+  # @param [String] address Public key, in hex
+  # @param [Integer] amount The amount of ERC20 tokens to send
   # @return [String] Transaction hash
-  def pay(_sender, _receiver, _amount)
-    # do it
-    'abcdef'
+  def pay(priv, address, amount)
+    func = 'a9059cbb' # transfer(address,uint256)
+    to_clean = address.downcase.sub(/^0x/, '')
+    to_padded = '0' * (64 - to_clean.size) + to_clean
+    amt_hex = amount.to_s(16)
+    amt_padded = '0' * (64 - amt_hex.size) + amt_hex
+    data = "0x#{func}#{to_padded}#{amt_padded}"
+    key = Eth::Key.new(priv: priv)
+    from = key.address
+    nonce = client.eth_getTransactionCount(from, 'pending').to_i(16)
+    gas = client.eth_estimateGas({ from:, to: @contract, data: data}, 'latest').to_i(16)
+    @log.info("Gas: #{gas}")
+    tx = Eth::Tx.new({
+      nonce:,
+      gas_price: 1000,
+      gas_limit: gas * 100,
+      to: @contract,
+      value: 0,
+      data: data,
+      chain_id: 4242
+    })
+    tx.sign(key)
+    client.eth_sendRawTransaction("0x" + tx.hex)
   end
 
   # Wait for incoming transactions and let the block know when they

test/erc20/test_wallet.rb

@@ -76,7 +76,19 @@ def test_checks_balance_on_testnet
   def test_checks_balance_on_hardhat
     on_hardhat do |wallet|
       b = wallet.balance(Eth::Key.new(priv: JEFF).address.to_s)
-      assert_equal(123_000, b)
+      assert_equal(123_000_000_000, b)
+    end
+  end
+
+  def test_pays_on_hardhat
+    on_hardhat do |wallet|
+      to = Eth::Key.new(priv: WALTER).address.to_s
+      before = wallet.balance(to)
+      sum = 42_000
+      from = Eth::Key.new(priv: JEFF).address.to_s
+      assert(wallet.balance(from) > sum * 2)
+      wallet.pay(JEFF, to, sum)
+      assert_equal(before - sum, wallet.balance(to))
     end
   end
 
@@ -147,27 +159,26 @@ def on_hardhat
         home: File.join(__dir__, '../../hardhat'),
         ports: { port => 8545 },
         command: 'npx hardhat node',
-        log: Loog::NULL
+        log: Loog::VERBOSE
       ) do
         wait_for(port)
         cmd = [
           '(cat hardhat.config.js)',
           '(ls -al)',
-          '(npx hardhat ignition deploy ./ignition/modules/Foo.ts --network foo)',
-          '(npx hardhat ignition deployments | tail -1 > /tmp/deployment.txt)',
-          '(npx hardhat ignition status "$(cat /tmp/deployment.txt)" | tail -1 | cut -d" " -f3)'
+          '(echo y | npx hardhat ignition deploy ./ignition/modules/Foo.ts --network foo --deployment-id foo)',
+          '(npx hardhat ignition status foo | tail -1 | cut -d" " -f3)'
         ].join(' && ')
         contract = donce(
           home: File.join(__dir__, '../../hardhat'),
           command: "/bin/bash -c #{Shellwords.escape(cmd)}",
           build_args: { 'HOST' => donce_host, 'PORT' => port },
-          log: Loog::NULL,
+          log: Loog::VERBOSE,
           root: true
         ).split("\n").last
         wallet = ERC20::Wallet.new(
           contract:,
           rpc: "http://localhost:#{port}",
-          log: Loog::NULL
+          log: Loog::VERBOSE
         )
         yield wallet
       end

test/test__helper.rb

@@ -35,5 +35,5 @@
 Minitest::Reporters.use! [Minitest::Reporters::SpecReporter.new]
 
 # To make tests retry on failure:
-require 'minitest/retry'
-Minitest::Retry.use!(methods_to_skip: [])
+# require 'minitest/retry'
+# Minitest::Retry.use!(methods_to_skip: [])