diff options
Diffstat (limited to 'vendor/github.com/dexon-foundation/dexon-consensus-core/core/utils.go')
-rw-r--r-- | vendor/github.com/dexon-foundation/dexon-consensus-core/core/utils.go | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/utils.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/utils.go deleted file mode 100644 index 6b9ce634f..000000000 --- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/utils.go +++ /dev/null @@ -1,161 +0,0 @@ -// Copyright 2018 The dexon-consensus Authors -// This file is part of the dexon-consensus library. -// -// The dexon-consensus library is free software: you can redistribute it -// and/or modify it under the terms of the GNU Lesser General Public License as -// published by the Free Software Foundation, either version 3 of the License, -// or (at your option) any later version. -// -// The dexon-consensus library is distributed in the hope that it will be -// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser -// General Public License for more details. -// -// You should have received a copy of the GNU Lesser General Public License -// along with the dexon-consensus library. If not, see -// <http://www.gnu.org/licenses/>. - -package core - -import ( - "errors" - "fmt" - "os" - "sort" - "time" - - "github.com/dexon-foundation/dexon-consensus/common" - "github.com/dexon-foundation/dexon-consensus/core/crypto" - "github.com/dexon-foundation/dexon-consensus/core/types" -) - -var ( - debug = false - // ErrEmptyTimestamps would be reported if Block.timestamps is empty. - ErrEmptyTimestamps = errors.New("timestamp vector should not be empty") -) - -func init() { - if os.Getenv("DEBUG") != "" { - debug = true - } -} - -// Debugf is like fmt.Printf, but only output when we are in debug mode. -func Debugf(format string, args ...interface{}) { - if debug { - fmt.Printf(format, args...) - } -} - -// Debugln is like fmt.Println, but only output when we are in debug mode. -func Debugln(args ...interface{}) { - if debug { - fmt.Println(args) - } -} - -func interpoTime(t1 time.Time, t2 time.Time, sep int) []time.Time { - if sep == 0 { - return []time.Time{} - } - if t1.After(t2) { - return interpoTime(t2, t1, sep) - } - timestamps := make([]time.Time, sep) - duration := t2.Sub(t1) - period := time.Duration( - (duration.Nanoseconds() / int64(sep+1))) * time.Nanosecond - prevTime := t1 - for idx := range timestamps { - prevTime = prevTime.Add(period) - timestamps[idx] = prevTime - } - return timestamps -} - -func getMedianTime(timestamps []time.Time) (t time.Time, err error) { - if len(timestamps) == 0 { - err = ErrEmptyTimestamps - return - } - tscopy := make([]time.Time, 0, len(timestamps)) - for _, ts := range timestamps { - tscopy = append(tscopy, ts) - } - sort.Sort(common.ByTime(tscopy)) - if len(tscopy)%2 == 0 { - t1 := tscopy[len(tscopy)/2-1] - t2 := tscopy[len(tscopy)/2] - t = interpoTime(t1, t2, 1)[0] - } else { - t = tscopy[len(tscopy)/2] - } - return -} - -func removeFromSortedUint32Slice(xs []uint32, x uint32) []uint32 { - indexToRemove := sort.Search(len(xs), func(idx int) bool { - return xs[idx] >= x - }) - if indexToRemove == len(xs) || xs[indexToRemove] != x { - // This value is not found. - return xs - } - return append(xs[:indexToRemove], xs[indexToRemove+1:]...) -} - -// HashConfigurationBlock returns the hash value of configuration block. -func HashConfigurationBlock( - notarySet map[types.NodeID]struct{}, - config *types.Config, - snapshotHash common.Hash, - prevHash common.Hash, -) common.Hash { - notaryIDs := make(types.NodeIDs, 0, len(notarySet)) - for nID := range notarySet { - notaryIDs = append(notaryIDs, nID) - } - sort.Sort(notaryIDs) - notarySetBytes := make([]byte, 0, len(notarySet)*len(common.Hash{})) - for _, nID := range notaryIDs { - notarySetBytes = append(notarySetBytes, nID.Hash[:]...) - } - configBytes := config.Bytes() - - return crypto.Keccak256Hash( - notarySetBytes[:], - configBytes[:], - snapshotHash[:], - prevHash[:], - ) -} - -// VerifyBlock verifies the signature of types.Block. -func VerifyBlock(b *types.Block) (err error) { - hash, err := hashBlock(b) - if err != nil { - return - } - if hash != b.Hash { - err = ErrIncorrectHash - return - } - pubKey, err := crypto.SigToPub(b.Hash, b.Signature) - if err != nil { - return - } - if !b.ProposerID.Equal(types.NewNodeID(pubKey)) { - err = ErrIncorrectSignature - return - } - return -} - -// DiffUint64 calculates difference between two uint64. -func DiffUint64(a, b uint64) uint64 { - if a > b { - return a - b - } - return b - a -} |