From bc9539a1b60dc80946bc867681eb32ecae4f0d66 Mon Sep 17 00:00:00 2001 From: Determinant Date: Mon, 12 Aug 2019 18:10:03 -0400 Subject: make the basic demo work --- consensus/dummy/consensus.go | 234 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 234 insertions(+) create mode 100644 consensus/dummy/consensus.go (limited to 'consensus') diff --git a/consensus/dummy/consensus.go b/consensus/dummy/consensus.go new file mode 100644 index 0000000..a496262 --- /dev/null +++ b/consensus/dummy/consensus.go @@ -0,0 +1,234 @@ +package dummy + +import ( + "fmt" + "time" + "errors" + "runtime" + "math/big" + "golang.org/x/crypto/sha3" + + "github.com/ethereum/go-ethereum/consensus" + "github.com/ethereum/go-ethereum/core/types" + "github.com/ethereum/go-ethereum/core/state" + "github.com/ethereum/go-ethereum/params" + "github.com/ethereum/go-ethereum/common" + "github.com/ethereum/go-ethereum/rlp" + "github.com/ethereum/go-ethereum/rpc" +) + +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 = big.NewInt(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 { + time.Sleep(1000 * time.Millisecond) + fmt.Printf("sealed %s\n", block.ParentHash().String()) + results <- block + 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 big.NewInt(0) +} + +func (self *DummyEngine) APIs(chain consensus.ChainReader) []rpc.API { + return nil +} + +func (self *DummyEngine) Close() error { + return nil +} -- cgit v1.2.3-70-g09d2