Merge pull request expanse-org#8 from thanhson1085/dev

add validator voting smart contract

.gitignore

@@ -37,6 +37,9 @@ profile.cov
 # VS Code
 .vscode
 
+# Vim
+.*.sw*
+
 # dashboard
 /dashboard/assets/flow-typed
 /dashboard/assets/node_modules

.travis.yml

@@ -28,7 +28,6 @@ matrix:
     script:
     - unset -f cd
     - brew update
-    - brew install caskroom/cask/brew-cask
     - brew cask install osxfuse
     - go run build/ci.go install
     - go run build/ci.go test -coverage

cmd/tomo/main.go

@@ -28,7 +28,6 @@ import (
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/cmd/utils"
-	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/console"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/eth"
@@ -47,8 +46,6 @@ const (
 var (
 	// Git SHA1 commit hash of the release (set via linker flags)
 	gitCommit = ""
-	// Ethereum address of the Geth release oracle.
-	relOracle = common.HexToAddress("0xfa7b9770ca4cb04296cac84f37736d4041251cdf")
 	// The app that holds all commands and flags.
 	app = utils.NewApp(gitCommit, "the go-ethereum command line interface")
 	// flags that configure the node

contracts/blocksigner/blocksigner.go

@@ -0,0 +1,41 @@
+package blocksigner
+
+import (
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/contracts/blocksigner/contract"
+)
+
+type BlockSigner struct {
+	*contract.BlockSignerSession
+	contractBackend bind.ContractBackend
+}
+
+func NewBlockSigner(transactOpts *bind.TransactOpts, contractAddr common.Address, contractBackend bind.ContractBackend) (*BlockSigner, error) {
+	blockSigner, err := contract.NewBlockSigner(contractAddr, contractBackend)
+	if err != nil {
+		return nil, err
+	}
+
+	return &BlockSigner{
+		&contract.BlockSignerSession{
+			Contract:     blockSigner,
+			TransactOpts: *transactOpts,
+		},
+		contractBackend,
+	}, nil
+}
+
+func DeployBlockSigner(transactOpts *bind.TransactOpts, contractBackend bind.ContractBackend) (common.Address, *BlockSigner, error) {
+	blockSignerAddr, _, _, err := contract.DeployBlockSigner(transactOpts, contractBackend)
+	if err != nil {
+		return blockSignerAddr, nil, err
+	}
+
+	blockSigner, err := NewBlockSigner(transactOpts, blockSignerAddr, contractBackend)
+	if err != nil {
+		return blockSignerAddr, nil, err
+	}
+
+	return blockSignerAddr, blockSigner, nil
+}

contracts/blocksigner/blocksigner_test.go

@@ -0,0 +1,36 @@
+package blocksigner
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+var (
+	key, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
+	addr   = crypto.PubkeyToAddress(key.PublicKey)
+)
+
+func TestBlockSigner(t *testing.T) {
+	contractBackend := backends.NewSimulatedBackend(core.GenesisAlloc{addr: {Balance: big.NewInt(1000000000)}})
+	transactOpts := bind.NewKeyedTransactor(key)
+
+	_, blockSigner, err := DeployBlockSigner(transactOpts, contractBackend)
+	if err != nil {
+		t.Fatalf("can't deploy root registry: %v", err)
+	}
+	contractBackend.Commit()
+
+	signers, err := blockSigner.GetSigners(big.NewInt(0))
+	if err != nil {
+		t.Fatalf("can't get candidates: %v", err)
+	}
+	for _, it := range signers {
+		t.Log("signer", it.String())
+	}
+	contractBackend.Commit()
+}

contracts/blocksigner/contract/BlockSigner.sol

@@ -0,0 +1,24 @@
+pragma solidity ^0.4.21;
+
+import "./libs/SafeMath.sol";
+
+contract BlockSigner {
+    using SafeMath for uint256;
+
+    event Sign(address _signer, uint256 blockNumber);
+
+    mapping(uint256 => address[]) blockSigners;
+
+    function sign(uint256 _blockNumber) external {
+        // consensus should validate all senders are validators, gas = 0
+        require(block.number >= _blockNumber);
+        require(block.number <= _blockNumber.add(990 * 2));
+        blockSigners[_blockNumber].push(msg.sender);
+
+        emit Sign(msg.sender, _blockNumber);
+    }
+
+    function getSigners(uint256 _blockNumber) public view returns(address[]) {
+        return blockSigners[_blockNumber];
+    }
+}