112 lines
2.6 KiB
Go
112 lines
2.6 KiB
Go
package lock
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import (
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"sync"
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"testing"
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"time"
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"golang.org/x/sync/errgroup"
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"k8s.io/apimachinery/pkg/util/sets"
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"gotest.tools/assert"
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is "gotest.tools/assert/cmp"
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)
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func TestMonitorUninitialized(t *testing.T) {
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t.Parallel()
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mv := NewMonitorVariable()
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subscription := mv.Subscribe()
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select {
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case <-subscription.NewValueReady():
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t.Fatalf("Received value update message: %v", subscription.Value())
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case <-time.After(time.Second):
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}
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}
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func TestGetUninitialized(t *testing.T) {
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mv := NewMonitorVariable()
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subscription := mv.Subscribe()
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val := subscription.Value()
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assert.Assert(t, is.Equal(val.Version, int64(0)))
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}
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func TestMonitorSetInitialVersionAfterListen(t *testing.T) {
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mv := NewMonitorVariable()
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subscription := mv.Subscribe()
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go mv.Set("test")
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<-subscription.NewValueReady()
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assert.Assert(t, is.Equal(subscription.Value().Value, "test"))
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}
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func TestMonitorSetInitialVersionBeforeListen(t *testing.T) {
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mv := NewMonitorVariable()
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subscription := mv.Subscribe()
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mv.Set("test")
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<-subscription.NewValueReady()
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assert.Assert(t, is.Equal(subscription.Value().Value, "test"))
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}
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func TestMonitorMultipleVersionsBlock(t *testing.T) {
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t.Parallel()
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mv := NewMonitorVariable()
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subscription := mv.Subscribe()
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mv.Set("test")
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<-subscription.NewValueReady()
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/* This should mark the "current" version as seen */
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val := subscription.Value()
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assert.Assert(t, is.Equal(val.Version, int64(1)))
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select {
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case <-subscription.NewValueReady():
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t.Fatalf("Received value update message: %v", subscription.Value())
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case <-time.After(time.Second):
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}
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}
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func TestMonitorMultipleVersions(t *testing.T) {
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t.Parallel()
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lock := sync.Mutex{}
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lock.Lock()
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mv := NewMonitorVariable()
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triggers := []int{}
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ch := make(chan struct{}, 10)
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go func() {
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defer lock.Unlock()
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subscription := mv.Subscribe()
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for {
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// Lint is wrong, we need to call the function each time to get a fresh channel.
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<-subscription.NewValueReady()
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val := subscription.Value()
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triggers = append(triggers, val.Value.(int))
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ch <- struct{}{}
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if val.Value == 9 {
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return
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}
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}
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}()
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for i := 0; i < 10; i++ {
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mv.Set(i)
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// Wait for the trigger to occur
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<-ch
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}
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// Wait for the goroutine to finish
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lock.Lock()
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t.Logf("Saw %v triggers", triggers)
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assert.Assert(t, is.Len(triggers, 10))
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// Make sure we saw all 10 unique values
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assert.Assert(t, is.Equal(sets.NewInt(triggers...).Len(), 10))
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}
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func TestMonitorMultipleSubscribers(t *testing.T) {
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group := &errgroup.Group{}
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mv := NewMonitorVariable()
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for i := 0; i < 10; i++ {
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sub := mv.Subscribe()
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group.Go(func() error {
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<-sub.NewValueReady()
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return nil
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})
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}
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mv.Set(1)
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_ = group.Wait()
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}
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