65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
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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)
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func TestBackoff(t *testing.T) {
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stats := Statistics{
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FailuresUntilBlacklist: 7,
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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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// 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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// Register another failure for good measure. This should have no
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// side effects since a backoff is already in progress. If it does
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// then we'll fail.
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until, blacklisted := server.Failure()
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// Get the duration.
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_, blacklist := server.BackoffInfo()
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duration := time.Until(until).Round(time.Second)
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// Unset the backoff, or otherwise our next call will think that
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// there's a backoff in progress and return the same result.
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server.cancel()
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server.backoffStarted.Store(false)
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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 if blacklist != blacklisted {
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t.Fatalf("BackoffInfo and Failure returned different blacklist values")
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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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