Merge PR #3819: Simulation Refactor

x/simulation/params.go

@@ -0,0 +1,69 @@
+package simulation
+
+import (
+	"math/rand"
+)
+
+const (
+	// Minimum time per block
+	minTimePerBlock int64 = 10000 / 2
+
+	// Maximum time per block
+	maxTimePerBlock int64 = 10000
+
+	// TODO Remove in favor of binary search for invariant violation
+	onOperation bool = false
+)
+
+// TODO explain transitional matrix usage
+var (
+	// Currently there are 3 different liveness types,
+	// fully online, spotty connection, offline.
+	defaultLivenessTransitionMatrix, _ = CreateTransitionMatrix([][]int{
+		{90, 20, 1},
+		{10, 50, 5},
+		{0, 10, 1000},
+	})
+
+	// 3 states: rand in range [0, 4*provided blocksize],
+	// rand in range [0, 2 * provided blocksize], 0
+	defaultBlockSizeTransitionMatrix, _ = CreateTransitionMatrix([][]int{
+		{85, 5, 0},
+		{15, 92, 1},
+		{0, 3, 99},
+	})
+)
+
+// Simulation parameters
+type Params struct {
+	PastEvidenceFraction      float64
+	NumKeys                   int
+	EvidenceFraction          float64
+	InitialLivenessWeightings []int
+	LivenessTransitionMatrix  TransitionMatrix
+	BlockSizeTransitionMatrix TransitionMatrix
+}
+
+// Return default simulation parameters
+func DefaultParams() Params {
+	return Params{
+		PastEvidenceFraction:      0.5,
+		NumKeys:                   250,
+		EvidenceFraction:          0.5,
+		InitialLivenessWeightings: []int{40, 5, 5},
+		LivenessTransitionMatrix:  defaultLivenessTransitionMatrix,
+		BlockSizeTransitionMatrix: defaultBlockSizeTransitionMatrix,
+	}
+}
+
+// Return random simulation parameters
+func RandomParams(r *rand.Rand) Params {
+	return Params{
+		PastEvidenceFraction:      r.Float64(),
+		NumKeys:                   r.Intn(250),
+		EvidenceFraction:          r.Float64(),
+		InitialLivenessWeightings: []int{r.Intn(80), r.Intn(10), r.Intn(10)},
+		LivenessTransitionMatrix:  defaultLivenessTransitionMatrix,
+		BlockSizeTransitionMatrix: defaultBlockSizeTransitionMatrix,
+	}
+}