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rewards.go
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rewards.go
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package fixture
import (
"encoding/binary"
"math/rand"
"slices"
"time"
"github.com/spacemeshos/go-spacemesh/common/types"
)
// NewRewardsGenerator with some random parameters.
func NewRewardsGenerator() *RewardsGenerator {
return new(RewardsGenerator).
WithSeed(time.Now().UnixNano()).
WithAddresses(10).
WithLayers(0, 10)
}
// RewardsGenerator generates random rewards.
// Rewards are not syntactically or contextually valid. This is for testing databases and APIs.
type RewardsGenerator struct {
rng *rand.Rand
UniqueCoinbase bool
Addrs []types.Address
Layers []types.LayerID
}
// WithSeed update randomness source.
func (g *RewardsGenerator) WithSeed(seed int64) *RewardsGenerator {
g.rng = rand.New(rand.NewSource(seed))
return g
}
// WithAddresses update addresses.
func (g *RewardsGenerator) WithAddresses(n int) *RewardsGenerator {
g.Addrs = nil
for i := 1; i <= n; i++ {
addr := types.Address{}
binary.BigEndian.PutUint64(addr[:], uint64(i))
g.Addrs = append(g.Addrs, addr)
}
return g
}
// WithLayers updates layers.
func (g *RewardsGenerator) WithLayers(start, n int) *RewardsGenerator {
g.Layers = nil
for i := 1; i <= n; i++ {
g.Layers = append(g.Layers, types.LayerID(uint32(start+i)))
}
return g
}
// WithUniqueCoinbase will generate every reward with different address.
func (g *RewardsGenerator) WithUniqueCoinbase() *RewardsGenerator {
g.UniqueCoinbase = true
return g
}
// Next generates Reward.
func (g *RewardsGenerator) Next() *types.Reward {
var reward types.Reward
g.rng.Read(reward.SmesherID[:])
index := g.rng.Intn(len(g.Addrs))
coinbase := g.Addrs[index]
if g.UniqueCoinbase {
g.Addrs = slices.Delete(g.Addrs, index, index+1)
}
reward.Coinbase = coinbase
reward.LayerReward = uint64(g.rng.Int())
reward.TotalReward = uint64(g.rng.Int())
reward.Layer = g.Layers[g.rng.Intn(len(g.Layers))]
return &reward
}