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// Copyright 2018 The dexon-consensus-core Authors
// This file is part of the dexon-consensus-core library.
//
// The dexon-consensus-core 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-core 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-core library. If not, see
// <http://www.gnu.org/licenses/>.
package test
import (
"math"
"time"
"github.com/dexon-foundation/dexon-consensus-core/common"
"github.com/dexon-foundation/dexon-consensus-core/core/types"
)
func stableRandomHash(blockConv types.BlockConverter) (common.Hash, error) {
block := blockConv.Block()
if (block.Hash != common.Hash{}) {
return block.Hash, nil
}
return common.NewRandomHash(), nil
}
// GenerateRandomValidatorIDs generates randomly a slices of types.ValidatorID.
func GenerateRandomValidatorIDs(validatorCount int) (vIDs types.ValidatorIDs) {
vIDs = types.ValidatorIDs{}
for i := 0; i < validatorCount; i++ {
vIDs = append(vIDs, types.ValidatorID{Hash: common.NewRandomHash()})
}
return
}
// CalcLatencyStatistics calculates average and deviation from a slice
// of latencies.
func CalcLatencyStatistics(latencies []time.Duration) (avg, dev time.Duration) {
var (
sum float64
sumOfSquareDiff float64
)
// Calculate average.
for _, v := range latencies {
sum += float64(v)
}
avgAsFloat := sum / float64(len(latencies))
avg = time.Duration(avgAsFloat)
// Calculate deviation
for _, v := range latencies {
diff := math.Abs(float64(v) - avgAsFloat)
sumOfSquareDiff += diff * diff
}
dev = time.Duration(math.Sqrt(sumOfSquareDiff / float64(len(latencies)-1)))
return
}
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