61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
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package statistics
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import (
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"math"
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"testing"
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"time"
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"go.uber.org/atomic"
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)
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func TestBackoff(t *testing.T) {
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stats := Statistics{
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FailuresUntilBlacklist: 5,
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}
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server := ServerStatistics{
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statistics: &stats,
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serverName: "test.com",
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}
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// Start by checking that counting successes works.
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server.Success()
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if successes := server.SuccessCount(); successes != 1 {
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t.Fatalf("Expected success count 1, got %d", successes)
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}
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// Register a failure.
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server.Failure()
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t.Logf("Backoff counter: %d", server.backoffCount.Load())
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backingOff := atomic.Bool{}
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// Now we're going to simulate backing off a few times to see
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// what happens.
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for i := uint32(1); i <= 10; i++ {
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// Interrupt the backoff - it doesn't really matter if it
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// completes but we will find out how long the backoff should
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// have been.
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interrupt := make(chan bool, 1)
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close(interrupt)
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// Get the duration.
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duration, blacklist := server.BackoffIfRequired(backingOff, interrupt)
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// Check if we should be blacklisted by now.
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if i > stats.FailuresUntilBlacklist {
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if !blacklist {
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t.Fatalf("Backoff %d should have resulted in blacklist but didn't", i)
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} else {
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t.Logf("Backoff %d is blacklisted as expected", i)
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continue
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}
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}
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// Check if the duration is what we expect.
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t.Logf("Backoff %d is for %s", i, duration)
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if wanted := time.Second * time.Duration(math.Exp2(float64(i))); !blacklist && duration != wanted {
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t.Fatalf("Backoff %d should have been %s but was %s", i, wanted, duration)
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}
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}
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}
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