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-rw-r--r--coreth.go270
1 files changed, 270 insertions, 0 deletions
diff --git a/coreth.go b/coreth.go
new file mode 100644
index 0000000..c7b5e42
--- /dev/null
+++ b/coreth.go
@@ -0,0 +1,270 @@
+package coreth
+
+import (
+ "math/big"
+ "fmt"
+ "time"
+ "errors"
+ "runtime"
+ "github.com/ethereum/go-ethereum/core/types"
+ "github.com/ethereum/go-ethereum/common"
+ //"github.com/ethereum/go-ethereum/eth"
+ "github.com/ethereum/go-ethereum/event"
+ "github.com/ethereum/go-ethereum/params"
+ "github.com/ethereum/go-ethereum/consensus"
+ "github.com/ethereum/go-ethereum/core/state"
+ "github.com/Determinant/coreth/miner"
+ "github.com/Determinant/coreth/eth"
+ "github.com/ethereum/go-ethereum/rlp"
+ "github.com/ethereum/go-ethereum/rpc"
+ "github.com/Determinant/coreth/node"
+ "golang.org/x/crypto/sha3"
+)
+
+type Tx = types.Transaction
+type Block = types.Block
+type Hash = common.Hash
+
+type ETHChain struct {
+ mux *event.TypeMux
+ worker *miner.Worker
+ backend *eth.Ethereum
+}
+
+type DummyEngine struct {
+}
+
+var (
+ allowedFutureBlockTime = 15 * time.Second // Max time from current time allowed for blocks, before they're considered future blocks
+)
+
+var (
+ errZeroBlockTime = errors.New("timestamp equals parent's")
+)
+
+// 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-data too long: %d > %d", len(header.Extra), params.MaximumExtraDataSize)
+ }
+ // Verify the header's timestamp
+ if !uncle {
+ if header.Time > uint64(time.Now().Add(allowedFutureBlockTime).Unix()) {
+ return consensus.ErrFutureBlock
+ }
+ }
+ if header.Time <= parent.Time {
+ return errZeroBlockTime
+ }
+ // Verify that the gas limit is <= 2^63-1
+ cap := uint64(0x7fffffffffffffff)
+ if header.GasLimit > cap {
+ return fmt.Errorf("invalid gasLimit: have %v, max %v", header.GasLimit, cap)
+ }
+ // Verify that the gasUsed is <= gasLimit
+ if header.GasUsed > header.GasLimit {
+ return fmt.Errorf("invalid gasUsed: have %d, gasLimit %d", header.GasUsed, header.GasLimit)
+ }
+
+ // Verify that the gas limit remains within allowed bounds
+ diff := int64(parent.GasLimit) - int64(header.GasLimit)
+ if diff < 0 {
+ diff *= -1
+ }
+ limit := parent.GasLimit / params.GasLimitBoundDivisor
+
+ if uint64(diff) >= limit || header.GasLimit < params.MinGasLimit {
+ return fmt.Errorf("invalid gas limit: have %d, want %d += %d", header.GasLimit, parent.GasLimit, limit)
+ }
+ // Verify that the block number is parent's +1
+ if diff := new(big.Int).Sub(header.Number, parent.Number); diff.Cmp(big.NewInt(1)) != 0 {
+ return consensus.ErrInvalidNumber
+ }
+ // Verify the engine specific seal securing the block
+ if seal {
+ if err := self.VerifySeal(chain, header); err != nil {
+ return err
+ }
+ }
+ return nil
+}
+
+func (self *DummyEngine) verifyHeaderWorker(chain consensus.ChainReader, headers []*types.Header, seals []bool, index int) error {
+ var parent *types.Header
+ if index == 0 {
+ parent = chain.GetHeader(headers[0].ParentHash, headers[0].Number.Uint64()-1)
+ } else if headers[index-1].Hash() == headers[index].ParentHash {
+ parent = headers[index-1]
+ }
+ if parent == nil {
+ return consensus.ErrUnknownAncestor
+ }
+ if chain.GetHeader(headers[index].Hash(), headers[index].Number.Uint64()) != nil {
+ return nil // known block
+ }
+ return self.verifyHeader(chain, headers[index], parent, false, seals[index])
+}
+
+func (self *DummyEngine) Author(header *types.Header) (common.Address, error) {
+ addr := common.Address{}
+ return addr, nil
+}
+
+func (self *DummyEngine) VerifyHeader(chain consensus.ChainReader, header *types.Header, seal bool) error {
+ // Short circuit if the header is known, or it's parent not
+ number := header.Number.Uint64()
+ if chain.GetHeader(header.Hash(), number) != nil {
+ return nil
+ }
+ parent := chain.GetHeader(header.ParentHash, number-1)
+ if parent == nil {
+ return consensus.ErrUnknownAncestor
+ }
+ // Sanity checks passed, do a proper verification
+ return self.verifyHeader(chain, header, parent, false, seal)
+}
+
+func (self *DummyEngine) VerifyHeaders(chain consensus.ChainReader, headers []*types.Header, seals []bool) (chan<- struct{}, <-chan error) {
+ // Spawn as many workers as allowed threads
+ workers := runtime.GOMAXPROCS(0)
+ if len(headers) < workers {
+ workers = len(headers)
+ }
+
+ // Create a task channel and spawn the verifiers
+ var (
+ inputs = make(chan int)
+ done = make(chan int, workers)
+ errors = make([]error, len(headers))
+ abort = make(chan struct{})
+ )
+ for i := 0; i < workers; i++ {
+ go func() {
+ for index := range inputs {
+ errors[index] = self.verifyHeaderWorker(chain, headers, seals, index)
+ done <- index
+ }
+ }()
+ }
+
+ errorsOut := make(chan error, len(headers))
+ go func() {
+ defer close(inputs)
+ var (
+ in, out = 0, 0
+ checked = make([]bool, len(headers))
+ inputs = inputs
+ )
+ for {
+ select {
+ case inputs <- in:
+ if in++; in == len(headers) {
+ // Reached end of headers. Stop sending to workers.
+ inputs = nil
+ }
+ case index := <-done:
+ for checked[index] = true; checked[out]; out++ {
+ errorsOut <- errors[out]
+ if out == len(headers)-1 {
+ return
+ }
+ }
+ case <-abort:
+ return
+ }
+ }
+ }()
+ return abort, errorsOut
+}
+
+func (self *DummyEngine) VerifyUncles(chain consensus.ChainReader, block *types.Block) error {
+ return nil
+}
+
+func (self *DummyEngine) VerifySeal(chain consensus.ChainReader, header *types.Header) error {
+ return nil
+}
+
+func (self *DummyEngine) Prepare(chain consensus.ChainReader, header *types.Header) error {
+ header.Difficulty = new(big.Int).SetUint64(0)
+ return nil
+}
+
+func (self *DummyEngine) Finalize(chain consensus.ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction,
+ uncles []*types.Header) {
+ // commit the final state root
+ header.Root = state.IntermediateRoot(chain.Config().IsEIP158(header.Number))
+}
+
+func (self *DummyEngine) FinalizeAndAssemble(chain consensus.ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction,
+ uncles []*types.Header, receipts []*types.Receipt) (*types.Block, error) {
+ // commit the final state root
+ header.Root = state.IntermediateRoot(chain.Config().IsEIP158(header.Number))
+
+ // Header seems complete, assemble into a block and return
+ return types.NewBlock(header, txs, uncles, receipts), nil
+}
+
+func (self *DummyEngine) Seal(chain consensus.ChainReader, block *types.Block, results chan<- *types.Block, stop <-chan struct{}) error {
+ return nil
+}
+
+func (self *DummyEngine) SealHash(header *types.Header) (hash common.Hash) {
+ hasher := sha3.NewLegacyKeccak256()
+
+ rlp.Encode(hasher, []interface{}{
+ header.ParentHash,
+ header.UncleHash,
+ header.Coinbase,
+ header.Root,
+ header.TxHash,
+ header.ReceiptHash,
+ header.Bloom,
+ header.Difficulty,
+ header.Number,
+ header.GasLimit,
+ header.GasUsed,
+ header.Time,
+ header.Extra,
+ })
+ hasher.Sum(hash[:0])
+ return hash
+}
+
+func (self *DummyEngine) CalcDifficulty(chain consensus.ChainReader, time uint64, parent *types.Header) *big.Int {
+ return new(big.Int).SetUint64(0)
+}
+
+func (self *DummyEngine) APIs(chain consensus.ChainReader) []rpc.API {
+ return nil
+}
+
+func (self *DummyEngine) Close() error {
+ return nil
+}
+
+func isLocalBlock(block *types.Block) bool {
+ return false
+}
+
+func NewETHChain(config *miner.Config, chainConfig *params.ChainConfig) *ETHChain {
+ if config == nil {
+ config = &eth.DefaultConfig.Miner
+ }
+ if chainConfig == nil {
+ chainConfig = params.MainnetChainConfig
+ }
+ mux := new(event.TypeMux)
+ ctx := node.NewServiceContext(mux)
+ backend, _ := eth.New(&ctx, &eth.DefaultConfig)
+ chain := &ETHChain {
+ mux: mux,
+ worker: miner.NewWorker(config, chainConfig, &DummyEngine{}, backend, mux, isLocalBlock),
+ }
+ return chain
+}
+
+func (self *ETHChain) Start() {
+ self.worker.Start()
+}
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