core: vm: add governance contract skeleton

2 files changed, 495 insertions, 0 deletions

diff --git a/core/vm/evm.go b/core/vm/evm.go
index 31902621b..fcab628e1 100644
--- a/core/vm/evm.go
+++ b/core/vm/evm.go
@@ -43,6 +43,9 @@ type (
 // run runs the given contract and takes care of running precompiles with a fallback to the byte code interpreter.
 func run(evm *EVM, contract *Contract, input []byte, readOnly bool) ([]byte, error) {
 	if contract.CodeAddr != nil {
+		if *contract.CodeAddr == GovernanceContractAddress {
+			return RunGovernanceContract(evm, input, contract)
+		}
 		precompiles := PrecompiledContractsHomestead
 		if evm.ChainConfig().IsByzantium(evm.BlockNumber) {
 			precompiles = PrecompiledContractsByzantium
diff --git a/core/vm/governance.go b/core/vm/governance.go
new file mode 100644
index 000000000..c3b316a64
--- /dev/null
+++ b/core/vm/governance.go
@@ -0,0 +1,492 @@
+package vm
+
+import (
+	"math/big"
+	"strings"
+
+	"github.com/dexon-foundation/dexon/accounts/abi"
+	"github.com/dexon-foundation/dexon/common"
+)
+
+var GovernanceContractAddress = common.BytesToAddress([]byte{0XED}) // Reverse of DEX0
+var multisigAddress = common.BytesToAddress([]byte("0x....."))
+var minStake = big.NewInt(10000000000000)
+
+const abiJSON = `
+[
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "round",
+    "outputs": [
+      {
+        "name": "",
+        "type": "uint256"
+      }
+    ],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "lambdaBA",
+    "outputs": [
+      {
+        "name": "",
+        "type": "int256"
+      }
+    ],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [
+      {
+        "name": "",
+        "type": "uint256"
+      }
+    ],
+    "name": "crs",
+    "outputs": [
+      {
+        "name": "",
+        "type": "bytes32"
+      }
+    ],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "phiRatio",
+    "outputs": [
+      {
+        "name": "",
+        "type": "int256"
+      }
+    ],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [
+      {
+        "name": "",
+        "type": "address"
+      }
+    ],
+    "name": "offset",
+    "outputs": [
+      {
+        "name": "",
+        "type": "uint256"
+      }
+    ],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "lambdaDKG",
+    "outputs": [
+      {
+        "name": "",
+        "type": "int256"
+      }
+    ],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "k",
+    "outputs": [
+      {
+        "name": "",
+        "type": "int256"
+      }
+    ],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "numChains",
+    "outputs": [
+      {
+        "name": "",
+        "type": "int256"
+      }
+    ],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [
+      {
+        "name": "",
+        "type": "uint256"
+      },
+      {
+        "name": "",
+        "type": "uint256"
+      }
+    ],
+    "name": "DKGMasterPublicKeys",
+    "outputs": [
+      {
+        "name": "",
+        "type": "bytes"
+      }
+    ],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [
+      {
+        "name": "",
+        "type": "uint256"
+      },
+      {
+        "name": "",
+        "type": "uint256"
+      }
+    ],
+    "name": "DKGComplaints",
+    "outputs": [
+      {
+        "name": "",
+        "type": "bytes"
+      }
+    ],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": true,
+    "inputs": [],
+    "name": "governanceMultisig",
+    "outputs": [
+      {
+        "name": "",
+        "type": "address"
+      }
+    ],
+    "payable": false,
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      {
+        "name": "",
+        "type": "int256"
+      },
+      {
+        "name": "",
+        "type": "int256"
+      },
+      {
+        "name": "",
+        "type": "int256"
+      },
+      {
+        "name": "",
+        "type": "int256"
+      },
+      {
+        "name": "",
+        "type": "int256"
+      }
+    ],
+    "name": "updateConfiguration",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      {
+        "name": "",
+        "type": "uint256"
+      },
+      {
+        "name": "",
+        "type": "bytes"
+      }
+    ],
+    "name": "proposeCRS",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      {
+        "name": "",
+        "type": "uint256"
+      },
+      {
+        "name": "",
+        "type": "bytes"
+      }
+    ],
+    "name": "addDKGMasterPublicKey",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      {
+        "name": "",
+        "type": "uint256"
+      },
+      {
+        "name": "",
+        "type": "bytes"
+      }
+    ],
+    "name": "addDKGComplaint",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      {
+        "name": "",
+        "type": "bytes"
+      }
+    ],
+    "name": "stake",
+    "outputs": [],
+    "payable": true,
+    "stateMutability": "payable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [],
+    "name": "unstake",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  }
+]
+`
+
+var abiObject abi.ABI
+var sig2Method map[string]abi.Method
+
+func init() {
+	// Parse governance contract ABI.
+	abiObject, err := abi.JSON(strings.NewReader(abiJSON))
+	if err != nil {
+		panic(err)
+	}
+
+	sig2Method = make(map[string]abi.Method)
+
+	// Construct dispatch table.
+	for _, method := range abiObject.Methods {
+		sig2Method[method.Sig()] = method
+	}
+}
+
+// RunGovernanceContract executes governance contract.
+func RunGovernanceContract(evm *EVM, input []byte, contract *Contract) (
+	ret []byte, err error) {
+	// Parse input.
+	method, exists := sig2Method[string(input[:4])]
+	if !exists {
+		return nil, errExecutionReverted
+	}
+
+	// Dispatch method call.
+	g := NewGovernanceContract(evm, contract)
+	argument := input[4:]
+
+	switch method.Name {
+	case "stake":
+		var publicKey []byte
+		if err := method.Inputs.Unpack(&publicKey, argument); err != nil {
+			return nil, errExecutionReverted
+		}
+		return g.stake(publicKey)
+	case "unstake":
+		return g.unstake()
+	case "proposeCRS":
+		return g.proposeCRS()
+	case "addDKGMasterPublicKey":
+		return g.addDKGMasterPublicKey()
+	case "addDKGComplaint":
+		return g.addDKGComplaint()
+	}
+	return nil, nil
+}
+
+// State manipulation helper fro the governance contract.
+type StateHelper struct {
+	StateDB StateDB
+}
+
+// 0: address public governanceMultisig;
+func (s *StateHelper) governanceMultisig() common.Address {
+	return common.Address{}
+}
+
+// 1: int256 public numChains;
+func (s *StateHelper) numChains() *big.Int {
+	return nil
+}
+
+// 2: int256 public lambdaBA;
+func (s *StateHelper) lambdaBA() *big.Int {
+	return nil
+}
+
+// 3: int256 public lambdaDKG;
+func (s *StateHelper) lambdaDKG() *big.Int {
+	return nil
+}
+
+// 4: int256 public k;
+func (s *StateHelper) k() *big.Int {
+	return nil
+}
+
+// 5: int256 public phiRatio;  // stored as PhiRatio * 10^6
+func (s *StateHelper) phiRatio() *big.Int {
+	return nil
+}
+
+// struct Node {
+//     address owner;
+//     bytes publicKey;
+//     uint256 staked;
+// }
+//
+// 6: Node[] nodes;
+
+type nodeInfo struct {
+	owner     common.Address
+	publicKey []byte
+	staked    *big.Int
+}
+
+func (s *StateHelper) nodesLength() *big.Int {
+	return nil
+}
+func (s *StateHelper) node(offset *big.Int) *nodeInfo {
+	return nil
+}
+func (s *StateHelper) pushNode(n *nodeInfo) {
+}
+
+// 7: mapping(address => uint256) public offset;
+func (s *StateHelper) offset(addr common.Address) *big.Int {
+	return nil
+}
+func (s *StateHelper) putOffset(addr common.Address, offset *big.Int) {
+}
+func (s *StateHelper) deleteOffset(addr common.Address) {
+}
+
+// 8: uint256 public round;
+func (s *StateHelper) round() *big.Int {
+	return nil
+}
+func (s *StateHelper) incRound() *big.Int {
+	return nil
+}
+
+// 9: mapping(uint256 => bytes32) public crs;
+func (s *StateHelper) crs(round *big.Int) common.Hash {
+	return common.Hash{}
+}
+func (s *StateHelper) pushCRS(round *big.Int, crs []byte) common.Hash {
+	return common.Hash{}
+}
+
+// 10: mapping(uint256 => bytes[]) public DKGMasterPublicKeys;
+func (s *StateHelper) dkgMasterPublicKey(round *big.Int) [][]byte {
+	return nil
+}
+func (s *StateHelper) addDKGMasterPublicKey(round *big.Int, pk []byte) {
+}
+
+// 11: mapping(uint256 => bytes[]) public DKGComplaints;
+func (s *StateHelper) dkgComplaint(round *big.Int) [][]byte {
+	return nil
+}
+func (s *StateHelper) addDKGComplaint(round *big.Int, complaint []byte) {
+}
+
+type GovernanceContract struct {
+	evm      *EVM
+	state    StateHelper
+	contract *Contract
+}
+
+func NewGovernanceContract(evm *EVM, contract *Contract) *GovernanceContract {
+	return &GovernanceContract{
+		evm:      evm,
+		state:    StateHelper{evm.StateDB},
+		contract: contract,
+	}
+}
+
+func (G *GovernanceContract) updateConfiguration() ([]byte, error) {
+	return nil, nil
+}
+
+func (g *GovernanceContract) stake(publicKey []byte) ([]byte, error) {
+	return nil, nil
+}
+
+func (g *GovernanceContract) unstake() ([]byte, error) {
+	return nil, nil
+}
+
+func (g *GovernanceContract) proposeCRS() ([]byte, error) {
+	return nil, nil
+}
+
+func (g *GovernanceContract) addDKGMasterPublicKey() ([]byte, error) {
+	return nil, nil
+}
+
+func (g *GovernanceContract) addDKGComplaint() ([]byte, error) {
+	return nil, nil
+}