cloudflare/cloudflared
Publicmirrored from https://github.com/cloudflare/cloudflaredAvailable
origin/backoffhandler_test.go
148lines · modeblame
d06fc520Areg Harutyunyan8 years ago | 1 | package origin |
| 2 | | |
| 3 | import ( | |
| 4 | "testing" | |
| 5 | "time" | |
| 6 | | |
| 7 | "golang.org/x/net/context" | |
| 8 | ) | |
| 9 | | |
| 10 | func immediateTimeAfter(time.Duration) <-chan time.Time { | |
| 11 | c := make(chan time.Time, 1) | |
| 12 | c <- time.Now() | |
| 13 | return c | |
| 14 | } | |
| 15 | | |
| 16 | func TestBackoffRetries(t *testing.T) { | |
| 17 | // make backoff return immediately | |
| 18 | timeAfter = immediateTimeAfter | |
| 19 | ctx := context.Background() | |
| 20 | backoff := BackoffHandler{MaxRetries: 3} | |
| 21 | if !backoff.Backoff(ctx) { | |
| 22 | t.Fatalf("backoff failed immediately") | |
| 23 | } | |
| 24 | if !backoff.Backoff(ctx) { | |
| 25 | t.Fatalf("backoff failed after 1 retry") | |
| 26 | } | |
| 27 | if !backoff.Backoff(ctx) { | |
| 28 | t.Fatalf("backoff failed after 2 retry") | |
| 29 | } | |
| 30 | if backoff.Backoff(ctx) { | |
| 31 | t.Fatalf("backoff allowed after 3 (max) retries") | |
| 32 | } | |
| 33 | } | |
| 34 | | |
| 35 | func TestBackoffCancel(t *testing.T) { | |
| 36 | // prevent backoff from returning normally | |
| 37 | timeAfter = func(time.Duration) <-chan time.Time { return make(chan time.Time) } | |
| 38 | ctx, cancelFunc := context.WithCancel(context.Background()) | |
| 39 | backoff := BackoffHandler{MaxRetries: 3} | |
| 40 | cancelFunc() | |
| 41 | if backoff.Backoff(ctx) { | |
| 42 | t.Fatalf("backoff allowed after cancel") | |
| 43 | } | |
| 44 | if _, ok := backoff.GetBackoffDuration(ctx); ok { | |
| 45 | t.Fatalf("backoff allowed after cancel") | |
| 46 | } | |
| 47 | } | |
| 48 | | |
| 49 | func TestBackoffGracePeriod(t *testing.T) { | |
| 50 | currentTime := time.Now() | |
| 51 | // make timeNow return whatever we like | |
| 52 | timeNow = func() time.Time { return currentTime } | |
| 53 | // make backoff return immediately | |
| 54 | timeAfter = immediateTimeAfter | |
| 55 | ctx := context.Background() | |
| 56 | backoff := BackoffHandler{MaxRetries: 1} | |
| 57 | if !backoff.Backoff(ctx) { | |
| 58 | t.Fatalf("backoff failed immediately") | |
| 59 | } | |
| 60 | // the next call to Backoff would fail unless it's after the grace period | |
| 61 | backoff.SetGracePeriod() | |
| 62 | // advance time to after the grace period (~4 seconds) and see what happens | |
| 63 | currentTime = currentTime.Add(time.Second * 5) | |
| 64 | if !backoff.Backoff(ctx) { | |
| 65 | t.Fatalf("backoff failed after the grace period expired") | |
| 66 | } | |
| 67 | // confirm we ignore grace period after backoff | |
| 68 | if backoff.Backoff(ctx) { | |
| 69 | t.Fatalf("backoff allowed after 1 (max) retry") | |
| 70 | } | |
| 71 | } | |
| 72 | | |
| 73 | func TestGetBackoffDurationRetries(t *testing.T) { | |
| 74 | // make backoff return immediately | |
| 75 | timeAfter = immediateTimeAfter | |
| 76 | ctx := context.Background() | |
| 77 | backoff := BackoffHandler{MaxRetries: 3} | |
| 78 | if _, ok := backoff.GetBackoffDuration(ctx); !ok { | |
| 79 | t.Fatalf("backoff failed immediately") | |
| 80 | } | |
| 81 | backoff.Backoff(ctx) // noop | |
| 82 | if _, ok := backoff.GetBackoffDuration(ctx); !ok { | |
| 83 | t.Fatalf("backoff failed after 1 retry") | |
| 84 | } | |
| 85 | backoff.Backoff(ctx) // noop | |
| 86 | if _, ok := backoff.GetBackoffDuration(ctx); !ok { | |
| 87 | t.Fatalf("backoff failed after 2 retry") | |
| 88 | } | |
| 89 | backoff.Backoff(ctx) // noop | |
| 90 | if _, ok := backoff.GetBackoffDuration(ctx); ok { | |
| 91 | t.Fatalf("backoff allowed after 3 (max) retries") | |
| 92 | } | |
| 93 | if backoff.Backoff(ctx) { | |
| 94 | t.Fatalf("backoff allowed after 3 (max) retries") | |
| 95 | } | |
| 96 | } | |
| 97 | | |
| 98 | func TestGetBackoffDuration(t *testing.T) { | |
| 99 | // make backoff return immediately | |
| 100 | timeAfter = immediateTimeAfter | |
| 101 | ctx := context.Background() | |
| 102 | backoff := BackoffHandler{MaxRetries: 3} | |
| 103 | if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second { | |
| 104 | t.Fatalf("backoff didn't return 1 second on first retry") | |
| 105 | } | |
| 106 | backoff.Backoff(ctx) // noop | |
| 107 | if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second*2 { | |
| 108 | t.Fatalf("backoff didn't return 2 seconds on second retry") | |
| 109 | } | |
| 110 | backoff.Backoff(ctx) // noop | |
| 111 | if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second*4 { | |
| 112 | t.Fatalf("backoff didn't return 4 seconds on third retry") | |
| 113 | } | |
| 114 | backoff.Backoff(ctx) // noop | |
| 115 | if duration, ok := backoff.GetBackoffDuration(ctx); ok || duration != 0 { | |
| 116 | t.Fatalf("backoff didn't return 0 seconds on fourth retry (exceeding limit)") | |
| 117 | } | |
| 118 | } | |
| 119 | | |
| 120 | func TestBackoffRetryForever(t *testing.T) { | |
| 121 | // make backoff return immediately | |
| 122 | timeAfter = immediateTimeAfter | |
| 123 | ctx := context.Background() | |
| 124 | backoff := BackoffHandler{MaxRetries: 3, RetryForever: true} | |
| 125 | if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second { | |
| 126 | t.Fatalf("backoff didn't return 1 second on first retry") | |
| 127 | } | |
| 128 | backoff.Backoff(ctx) // noop | |
| 129 | if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second*2 { | |
| 130 | t.Fatalf("backoff didn't return 2 seconds on second retry") | |
| 131 | } | |
| 132 | backoff.Backoff(ctx) // noop | |
| 133 | if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second*4 { | |
| 134 | t.Fatalf("backoff didn't return 4 seconds on third retry") | |
| 135 | } | |
| 136 | if !backoff.Backoff(ctx) { | |
| 137 | t.Fatalf("backoff refused on fourth retry despire RetryForever") | |
| 138 | } | |
| 139 | if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second*8 { | |
| 140 | t.Fatalf("backoff returned %v instead of 8 seconds on fourth retry", duration) | |
| 141 | } | |
| 142 | if !backoff.Backoff(ctx) { | |
| 143 | t.Fatalf("backoff refused on fifth retry despire RetryForever") | |
| 144 | } | |
| 145 | if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second*8 { | |
| 146 | t.Fatalf("backoff returned %v instead of 8 seconds on fifth retry", duration) | |
| 147 | } | |
| 148 | } |