path: root/consensus/dummy/consensus.go

package dummy

import (
	"errors"
	"fmt"
	"golang.org/x/crypto/sha3"
	"math/big"
	"runtime"
	"time"

	"github.com/ava-labs/coreth/consensus"
	"github.com/ava-labs/coreth/core/state"
	"github.com/ava-labs/coreth/core/types"
	"github.com/ava-labs/coreth/params"
	"github.com/ava-labs/coreth/rpc"
	"github.com/ava-labs/go-ethereum/common"
	"github.com/ava-labs/go-ethereum/rlp"
	mapset "github.com/deckarep/golang-set"
)

type OnFinalizeCallbackType = func(chain consensus.ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction, uncles []*types.Header)
type OnFinalizeAndAssembleCallbackType = func(state *state.StateDB, txs []*types.Transaction) ([]byte, error)
type OnAPIsCallbackType = func(consensus.ChainReader) []rpc.API
type OnExtraStateChangeType = func(block *types.Block, statedb *state.StateDB) error

type ConsensusCallbacks struct {
	OnSeal                func(*types.Block) error
	OnSealHash            func(*types.Header)
	OnAPIs                OnAPIsCallbackType
	OnFinalize            OnFinalizeCallbackType
	OnFinalizeAndAssemble OnFinalizeAndAssembleCallbackType
	OnExtraStateChange    OnExtraStateChangeType
}

type DummyEngine struct {
	cb *ConsensusCallbacks
}

func NewDummyEngine(cb *ConsensusCallbacks) *DummyEngine {
	return &DummyEngine{cb: cb}
}

var (
	allowedFutureBlockTime = 15 * time.Second // Max time from current time allowed for blocks, before they're considered future blocks
)

var (
	maxUncles = 2 // Maximum number of uncles allowed in a single block

	errTooManyUncles   = errors.New("too many uncles")
	errZeroBlockTime   = errors.New("timestamp equals parent's")
	errDuplicateUncle  = errors.New("duplicate uncle")
	errUncleIsAncestor = errors.New("uncle is ancestor")
	errDanglingUncle   = errors.New("uncle's parent is not ancestor")
)

// modified from consensus.go
func (self *DummyEngine) verifyHeader(chain consensus.ChainReader, header, parent *types.Header, uncle bool, seal bool) error {
	// Ensure that the header's extra-data section is of a reasonable size
	if uint64(len(header.Extra)) > params.MaximumExtraDataSize {
		return fmt.Errorf("extra-d