dendrite/federationsender/statistics/statistics_test.go

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package statistics
import (
"math"
"testing"
"time"
"go.uber.org/atomic"
)
func TestBackoff(t *testing.T) {
stats := Statistics{
FailuresUntilBlacklist: 7,
}
server := ServerStatistics{
statistics: &stats,
serverName: "test.com",
}
// Start by checking that counting successes works.
server.Success()
if successes := server.SuccessCount(); successes != 1 {
t.Fatalf("Expected success count 1, got %d", successes)
}
// Register a failure.
server.Failure()
t.Logf("Backoff counter: %d", server.backoffCount.Load())
backingOff := atomic.Bool{}
// Now we're going to simulate backing off a few times to see
// what happens.
for i := uint32(1); i <= 10; i++ {
// Interrupt the backoff - it doesn't really matter if it
// completes but we will find out how long the backoff should
// have been.
interrupt := make(chan bool, 1)
close(interrupt)
// Get the duration.
duration, blacklist := server.BackoffIfRequired(backingOff, interrupt)
// Register another failure for good measure. This should have no
// side effects since a backoff is already in progress. If it does
// then we'll fail.
until, blacklisted := server.Failure()
if time.Until(until) > duration {
t.Fatal("Failure produced unexpected side effect when it shouldn't have")
}
// Check if we should be blacklisted by now.
if i >= stats.FailuresUntilBlacklist {
if !blacklist {
t.Fatalf("Backoff %d should have resulted in blacklist but didn't", i)
} else if blacklist != blacklisted {
t.Fatalf("BackoffIfRequired and Failure returned different blacklist values")
} else {
t.Logf("Backoff %d is blacklisted as expected", i)
continue
}
}
// Check if the duration is what we expect.
t.Logf("Backoff %d is for %s", i, duration)
if wanted := time.Second * time.Duration(math.Exp2(float64(i))); !blacklist && duration != wanted {
t.Fatalf("Backoff %d should have been %s but was %s", i, wanted, duration)
}
}
}