[#479] morph/timer: Move block timer to morph package

Block timer is going to be reused in storage node to tick
EigenTrust calculation rounds.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/morph/timer/block_test.go

@@ -0,0 +1,110 @@
+package timer_test
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neofs-node/pkg/morph/timer"
+	"github.com/stretchr/testify/require"
+)
+
+func tickN(t *timer.BlockTimer, n uint32) {
+	for i := uint32(0); i < n; i++ {
+		t.Tick()
+	}
+}
+
+func TestBlockTimer(t *testing.T) {
+	blockDur := uint32(10)
+	baseCallCounter := uint32(0)
+
+	bt := timer.NewBlockTimer(timer.StaticBlockMeter(blockDur), func() {
+		baseCallCounter++
+	})
+
+	require.NoError(t, bt.Reset())
+
+	intervalNum := uint32(7)
+
+	tickN(bt, intervalNum*blockDur)
+
+	require.Equal(t, intervalNum, uint32(baseCallCounter))
+
+	// add half-interval handler
+	halfCallCounter := uint32(0)
+
+	bt.OnDelta(1, 2, func() {
+		halfCallCounter++
+	})
+
+	// add double interval handler
+	doubleCallCounter := uint32(0)
+
+	bt.OnDelta(2, 1, func() {
+		doubleCallCounter++
+	})
+
+	require.NoError(t, bt.Reset())
+
+	baseCallCounter = 0
+	intervalNum = 20
+
+	tickN(bt, intervalNum*blockDur)
+
+	require.Equal(t, intervalNum, uint32(halfCallCounter))
+	require.Equal(t, intervalNum, uint32(baseCallCounter))
+	require.Equal(t, intervalNum/2, uint32(doubleCallCounter))
+}
+
+func TestDeltaPulse(t *testing.T) {
+	blockDur := uint32(9)
+	baseCallCounter := uint32(0)
+
+	bt := timer.NewBlockTimer(timer.StaticBlockMeter(blockDur), func() {
+		baseCallCounter++
+	})
+
+	deltaCallCounter := uint32(0)
+
+	div := uint32(3)
+
+	bt.OnDelta(1, div, func() {
+		deltaCallCounter++
+	}, timer.WithPulse())
+
+	require.NoError(t, bt.Reset())
+
+	intervalNum := uint32(7)
+
+	tickN(bt, intervalNum*blockDur)
+
+	require.Equal(t, intervalNum, uint32(baseCallCounter))
+	require.Equal(t, intervalNum*div, uint32(deltaCallCounter))
+}
+
+func TestDeltaReset(t *testing.T) {
+	blockDur := uint32(6)
+	baseCallCounter := 0
+
+	bt := timer.NewBlockTimer(timer.StaticBlockMeter(blockDur), func() {
+		baseCallCounter++
+	})
+
+	detlaCallCounter := 0
+
+	bt.OnDelta(1, 3, func() {
+		detlaCallCounter++
+	})
+
+	require.NoError(t, bt.Reset())
+
+	tickN(bt, 6)
+
+	require.Equal(t, 1, baseCallCounter)
+	require.Equal(t, 1, detlaCallCounter)
+
+	require.NoError(t, bt.Reset())
+
+	tickN(bt, 3)
+
+	require.Equal(t, 2, detlaCallCounter)
+}