|
| 1 | +package minio |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "math/rand" |
| 6 | + "testing" |
| 7 | + "time" |
| 8 | +) |
| 9 | + |
| 10 | +func TestRetryTimer(t *testing.T) { |
| 11 | + |
| 12 | + t.Run("withLimit", func(t *testing.T) { |
| 13 | + t.Parallel() |
| 14 | + c := &Client{random: rand.New(rand.NewSource(42))} |
| 15 | + ctx := context.Background() |
| 16 | + var count int |
| 17 | + for range c.newRetryTimer(ctx, 3, time.Millisecond, 10*time.Millisecond, 0.0) { |
| 18 | + count++ |
| 19 | + } |
| 20 | + if count != 3 { |
| 21 | + t.Errorf("expected exactly 3 yields") |
| 22 | + } |
| 23 | + }) |
| 24 | + |
| 25 | + t.Run("checkDelay", func(t *testing.T) { |
| 26 | + t.Parallel() |
| 27 | + c := &Client{random: rand.New(rand.NewSource(42))} |
| 28 | + ctx := context.Background() |
| 29 | + prev := time.Now() |
| 30 | + baseSleep := time.Millisecond |
| 31 | + maxSleep := 10 * time.Millisecond |
| 32 | + for i := range c.newRetryTimer(ctx, 6, baseSleep, maxSleep, 0.0) { |
| 33 | + if i == 0 { |
| 34 | + // there is no sleep for the first execution |
| 35 | + if time.Since(prev) >= time.Millisecond { |
| 36 | + t.Errorf("expected to not sleep for the first instance of the loop") |
| 37 | + } |
| 38 | + prev = time.Now() |
| 39 | + continue |
| 40 | + } |
| 41 | + expect := baseSleep * time.Duration(1<<uint(i-1)) |
| 42 | + expect = min(expect, maxSleep) |
| 43 | + if d := time.Since(prev); d < expect || d > 2*maxSleep { |
| 44 | + t.Errorf("expected to sleep for at least %s", expect.String()) |
| 45 | + } |
| 46 | + prev = time.Now() |
| 47 | + } |
| 48 | + }) |
| 49 | + |
| 50 | + t.Run("withBreak", func(t *testing.T) { |
| 51 | + t.Parallel() |
| 52 | + c := &Client{random: rand.New(rand.NewSource(42))} |
| 53 | + ctx := context.Background() |
| 54 | + var count int |
| 55 | + for range c.newRetryTimer(ctx, 10, time.Millisecond, 10*time.Millisecond, 0.5) { |
| 56 | + count++ |
| 57 | + if count >= 3 { |
| 58 | + break |
| 59 | + } |
| 60 | + } |
| 61 | + if count != 3 { |
| 62 | + t.Errorf("expected exactly 3 yields") |
| 63 | + } |
| 64 | + }) |
| 65 | + |
| 66 | + t.Run("withCancelledContext", func(t *testing.T) { |
| 67 | + t.Parallel() |
| 68 | + c := &Client{random: rand.New(rand.NewSource(42))} |
| 69 | + ctx := context.Background() |
| 70 | + ctx, cancel := context.WithCancel(ctx) |
| 71 | + cancel() |
| 72 | + var count int |
| 73 | + for range c.newRetryTimer(ctx, 10, time.Millisecond, 10*time.Millisecond, 0.5) { |
| 74 | + count++ |
| 75 | + } |
| 76 | + if count != 0 { |
| 77 | + t.Errorf("expected no yields") |
| 78 | + } |
| 79 | + }) |
| 80 | + t.Run("whileCancelledContext", func(t *testing.T) { |
| 81 | + t.Parallel() |
| 82 | + c := &Client{random: rand.New(rand.NewSource(42))} |
| 83 | + ctx := context.Background() |
| 84 | + ctx, cancel := context.WithCancel(ctx) |
| 85 | + var count int |
| 86 | + for range c.newRetryTimer(ctx, 10, time.Millisecond, 10*time.Millisecond, 0.5) { |
| 87 | + count++ |
| 88 | + cancel() |
| 89 | + } |
| 90 | + cancel() |
| 91 | + if count != 1 { |
| 92 | + t.Errorf("expected only one yield") |
| 93 | + } |
| 94 | + }) |
| 95 | +} |
| 96 | + |
| 97 | +func TestRetryContinuous(t *testing.T) { |
| 98 | + |
| 99 | + t.Run("checkDelay", func(t *testing.T) { |
| 100 | + t.Parallel() |
| 101 | + c := &Client{random: rand.New(rand.NewSource(42))} |
| 102 | + prev := time.Now() |
| 103 | + baseSleep := time.Millisecond |
| 104 | + maxSleep := 10 * time.Millisecond |
| 105 | + for i := range c.newRetryTimerContinous(time.Millisecond, 10*time.Millisecond, 0.0) { |
| 106 | + if i == 0 { |
| 107 | + // there is no sleep for the first execution |
| 108 | + if time.Since(prev) >= time.Millisecond { |
| 109 | + t.Errorf("expected to not sleep for the first instance of the loop") |
| 110 | + } |
| 111 | + prev = time.Now() |
| 112 | + continue |
| 113 | + } |
| 114 | + expect := baseSleep * time.Duration(1<<uint(i-1)) |
| 115 | + expect = min(expect, maxSleep) |
| 116 | + if d := time.Since(prev); d < expect || d > 2*maxSleep { |
| 117 | + t.Errorf("expected to sleep for at least %s", expect.String()) |
| 118 | + } |
| 119 | + prev = time.Now() |
| 120 | + if i >= 10 { |
| 121 | + break |
| 122 | + } |
| 123 | + } |
| 124 | + }) |
| 125 | + |
| 126 | + t.Run("withBreak", func(t *testing.T) { |
| 127 | + t.Parallel() |
| 128 | + c := &Client{random: rand.New(rand.NewSource(42))} |
| 129 | + var count int |
| 130 | + for range c.newRetryTimerContinous(time.Millisecond, 10*time.Millisecond, 0.5) { |
| 131 | + count++ |
| 132 | + if count >= 3 { |
| 133 | + break |
| 134 | + } |
| 135 | + } |
| 136 | + if count != 3 { |
| 137 | + t.Errorf("expected exactly 3 yields") |
| 138 | + } |
| 139 | + }) |
| 140 | +} |
0 commit comments