141 lines
3.1 KiB
Go
141 lines
3.1 KiB
Go
package initializer
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import (
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"context"
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"sync"
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"sync/atomic"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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)
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type testingInitializer struct {
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InitHandler
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}
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func (ti *testingInitializer) Reset() {
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// Reset the initialization state and reinitialize synchronization primitives
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ti.InitHandler.initialized = false
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ti.InitHandler.setupCondOnce = sync.Once{}
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ti.InitHandler.initCond = nil
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}
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func TestInitializedDefaultFalse(t *testing.T) {
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var ti testingInitializer
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if ti.Initialized() {
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t.Fatalf("Initialized() = true; want false before InitOnce")
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}
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}
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func TestInitOnceSetsInitializedAndCallsOnce(t *testing.T) {
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asserts := assert.New(t)
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var ti testingInitializer
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var calls int32
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var wg sync.WaitGroup
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concurrency := 50
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wg.Add(concurrency)
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for i := 0; i < concurrency; i++ {
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go func() {
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defer wg.Done()
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ti.InitOnce(func() {
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// Add a small sleep to increase contention window
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atomic.AddInt32(&calls, 1)
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time.Sleep(10 * time.Millisecond)
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})
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}()
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}
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wg.Wait()
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asserts.Equal(int32(1), atomic.LoadInt32(&calls))
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asserts.True(ti.Initialized())
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}
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func TestWaitForInitBlocksAndUnblocks(t *testing.T) {
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var ti testingInitializer
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waiters := 10
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started := make(chan struct{}, waiters)
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done := make(chan struct{}, waiters)
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for i := 0; i < waiters; i++ {
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go func() {
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started <- struct{}{}
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ti.WaitForInit()
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done <- struct{}{}
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}()
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}
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// Ensure all waiters have started and are blocked
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for i := 0; i < waiters; i++ {
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select {
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case <-started:
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// ok
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case <-time.After(200 * time.Millisecond):
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t.Fatalf("timeout waiting for waiter %d to start", i)
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}
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}
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// Verify none finished yet
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select {
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case <-done:
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t.Fatalf("waiter finished before initialization; expected to be blocked")
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case <-time.After(50 * time.Millisecond):
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// expected: still blocked
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}
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// Now initialize and ensure all are released
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ti.InitOnce(func() {})
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for i := 0; i < waiters; i++ {
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select {
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case <-done:
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// ok
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case <-time.After(500 * time.Millisecond):
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t.Fatalf("timeout waiting for waiter %d to finish after init", i)
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}
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}
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}
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func TestWaitForInitContextTimeout(t *testing.T) {
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asserts := assert.New(t)
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var ti testingInitializer
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ctx, cancel := context.WithTimeout(context.Background(), 50*time.Millisecond)
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defer cancel()
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start := time.Now()
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err := ti.WaitForInitContext(ctx)
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asserts.Error(err)
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dl := time.Since(start)
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asserts.Greater(dl, 40*time.Millisecond, "WaitForInitContext returned too early: %v", dl)
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}
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func TestWaitForInitContextSucceeds(t *testing.T) {
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asserts := assert.New(t)
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var ti testingInitializer
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ctx, cancel := context.WithTimeout(context.Background(), time.Second)
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defer cancel()
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// Initialize after a short delay
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go func() {
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time.Sleep(50 * time.Millisecond)
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ti.InitOnce(func() {})
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}()
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asserts.NoError(ti.WaitForInitContext(ctx))
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}
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func TestWaitAfterInitializedImmediateReturn(t *testing.T) {
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var ti testingInitializer
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ti.InitOnce(func() {})
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done := make(chan struct{})
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go func() {
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ti.WaitForInit()
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close(done)
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}()
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select {
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case <-done:
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// ok, returned quickly
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case <-time.After(100 * time.Millisecond):
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t.Fatalf("WaitForInit did not return quickly after already initialized")
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}
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}
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