remove dead code

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

exchange/bitswap/strategy/ledger.go

@@ -46,6 +46,15 @@ type ledger struct {
 	sentToPeer map[u.Key]time.Time
 }
 
+type debtRatio struct {
+	BytesSent uint64
+	BytesRecv uint64
+}
+
+func (dr *debtRatio) Value() float64 {
+	return float64(dr.BytesSent) / float64(dr.BytesRecv+1)
+}
+
 func (l *ledger) SentBytes(n int) {
 	l.exchangeCount++
 	l.lastExchange = time.Now()

exchange/bitswap/strategy/math.go

-package strategy
-
-import (
-	"math"
-	"math/rand"
-)
-
-type strategyFunc func(*ledger) bool
-
-// TODO avoid using rand.Float64 method. it uses a singleton lock and may cause
-// performance issues. Instead, instantiate a rand struct and use that to call
-// Float64()
-func standardStrategy(l *ledger) bool {
-	return rand.Float64() <= probabilitySend(l.Accounting.Value())
-}
-
-func yesManStrategy(l *ledger) bool {
-	return true
-}
-
-func probabilitySend(ratio float64) float64 {
-	x := 1 + math.Exp(6-3*ratio)
-	y := 1 / x
-	return 1 - y
-}
-
-type debtRatio struct {
-	BytesSent uint64
-	BytesRecv uint64
-}
-
-func (dr *debtRatio) Value() float64 {
-	return float64(dr.BytesSent) / float64(dr.BytesRecv+1)
-}

exchange/bitswap/strategy/math_test.go

-package strategy
-
-import (
-	"testing"
-)
-
-func TestProbabilitySendDecreasesAsRatioIncreases(t *testing.T) {
-	grateful := debtRatio{BytesSent: 0, BytesRecv: 10000}
-	pWhenGrateful := probabilitySend(grateful.Value())
-
-	abused := debtRatio{BytesSent: 10000, BytesRecv: 0}
-	pWhenAbused := probabilitySend(abused.Value())
-
-	if pWhenGrateful < pWhenAbused {
-		t.Fail()
-	}
-}