Implement block reward contract feature

core/state_processor.go

@@ -17,6 +17,11 @@
 package core
 
 import (
+	"math"
+	"math/big"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/accounts/abi"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/consensus"
 	"github.com/ethereum/go-ethereum/consensus/misc"
@@ -24,6 +29,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/params"
 )
 
@@ -87,6 +93,11 @@ func (p *StateProcessor) Process(block *types.Block, statedb, privateState *stat
 			allLogs = append(allLogs, privateReceipt.Logs...)
 		}
 	}
+
+	if p.config.BlockReward != nil {
+		CallBlockReward(statedb, p.bc, header, p.config)
+	}
+
 	// Finalize the block, applying any consensus engine specific extras (e.g. block rewards)
 	p.engine.Finalize(p.bc, header, statedb, block.Transactions(), block.Uncles())
 
@@ -171,3 +182,30 @@ func ApplyTransaction(config *params.ChainConfig, bc *BlockChain, author *common
 
 	return receipt, privateReceipt, err
 }
+
+func CallBlockReward(state *state.StateDB, bc *BlockChain, header *types.Header, config *params.ChainConfig) {
+	var from = common.HexToAddress("0x0")
+	var to common.Address = config.BlockReward.Contract
+	var bigZero = big.NewInt(0)
+	var gas uint64 = math.MaxUint64
+	log.Trace("Call to block reward contract", "address", to)
+	abi, _ := abi.JSON(strings.NewReader(`[{"type":"function","name":"reward","constant":false,"inputs":[{"name":"benefactors","type":"address[]"},{"name":"kind","type":"uint16[]"}],"outputs":[{"name":"receivers","type":"address[]"},{"name":"values","type":"uint256[]"}]}]`))
+	calldata, _ := abi.Pack("reward", [0]common.Address{}, [0]uint16{})
+	msg := types.NewMessage(from, &to, 0, bigZero, gas, bigZero, calldata, false)
+	evmContext := NewEVMContext(msg, header, bc, nil)
+	// Create a new environment which holds all relevant information
+	// about the transaction and calling mechanisms.
+	evm := vm.NewEVM(evmContext, state, state, config, vm.Config{})
+	gaspool := new(GasPool).AddGas(gas)
+	ret, _, _, _ := NewStateTransition(evm, msg, gaspool).TransitionDb()
+
+	receivers := make([]common.Address, 0, 1)
+	values := make([]*big.Int, 0, 1)
+	_ = abi.Unpack(&[]interface{}{&receivers, &values}, "reward", ret)
+
+	state.SetNonce(from, 0)
+	for i, receiver := range receivers {
+		log.Trace("Minting coins", "receiver", receiver, "values", *values[i])
+		state.AddBalance(receiver, values[i])
+	}
+}

miner/worker.go

@@ -1048,6 +1048,11 @@ func (w *worker) commit(uncles []*types.Header, interval func(), update bool, st
 
 	s := w.current.state.Copy()
 	ps := w.current.privateState.Copy()
+
+	if w.chainConfig.BlockReward != nil {
+		core.CallBlockReward(s, w.chain, w.current.header, w.chainConfig)
+	}
+
 	block, err := w.engine.FinalizeAndAssemble(w.chain, w.current.header, s, w.current.txs, uncles, w.current.receipts)
 	if err != nil {
 		return err

params/config.go

@@ -214,19 +214,19 @@ var (
 	//
 	// This configuration is intentionally not using keyed fields to force anyone
 	// adding flags to the config to also have to set these fields.
-	AllEthashProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil, nil, false, 32, 32, big.NewInt(0), big.NewInt(0), nil}
+	AllEthashProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil, nil, false, 32, 32, big.NewInt(0), big.NewInt(0), nil, nil}
 
 	// AllCliqueProtocolChanges contains every protocol change (EIPs) introduced
 	// and accepted by the Ethereum core developers into the Clique consensus.
 	//
 	// This configuration is intentionally not using keyed fields to force anyone
 	// adding flags to the config to also have to set these fields.
-	AllCliqueProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, &CliqueConfig{Period: 0, Epoch: 30000}, nil, false, 32, 32, big.NewInt(0), big.NewInt(0), nil}
+	AllCliqueProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, &CliqueConfig{Period: 0, Epoch: 30000}, nil, false, 32, 32, big.NewInt(0), big.NewInt(0), nil, nil}
 
-	TestChainConfig = &ChainConfig{big.NewInt(10), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil, nil, false, 32, 32, big.NewInt(0), big.NewInt(0), nil}
+	TestChainConfig = &ChainConfig{big.NewInt(10), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil, nil, false, 32, 32, big.NewInt(0), big.NewInt(0), nil, nil}
 	TestRules       = TestChainConfig.Rules(new(big.Int))
 
-	QuorumTestChainConfig = &ChainConfig{big.NewInt(10), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil, nil, true, 64, 32, big.NewInt(0), big.NewInt(0), nil}
+	QuorumTestChainConfig = &ChainConfig{big.NewInt(10), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil, nil, true, 64, 32, big.NewInt(0), big.NewInt(0), nil, nil}
 )
 
 // TrustedCheckpoint represents a set of post-processed trie roots (CHT and
@@ -318,6 +318,12 @@ type ChainConfig struct {
 	// to track multiple changes to maxCodeSize
 	MaxCodeSizeConfig []MaxCodeConfigStruct `json:"maxCodeSizeConfig,omitempty"`
 	// Quorum
+
+	BlockReward *BlockRewardConfig `json:"blockRewardConfig,omitempty"`
+}
+
+type BlockRewardConfig struct {
+	Contract common.Address `json:"contract,omitempty"` // Block reward contract address
 }
 
 // EthashConfig is the consensus engine configs for proof-of-work based sealing.