65 lines
1.2 KiB
Go
65 lines
1.2 KiB
Go
//go:build race
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// +build race
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package reloader
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import (
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"context"
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"net/http"
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"sync"
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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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func TestAtomicHandlerRaces(t *testing.T) {
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type testHandler struct{ http.Handler }
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hrFn := func() http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {})
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}
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const count = 8
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hrFuncMap := make(map[http.Handler]struct{}, count)
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for i := 0; i < count; i++ {
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hrFuncMap[&testHandler{hrFn()}] = struct{}{}
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}
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hr := NewAtomicHandler(nil)
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assert.NotNil(t, hr)
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var wg sync.WaitGroup
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defer wg.Wait()
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ctx, cancel := context.WithTimeout(context.Background(), time.Second/4)
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defer cancel()
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// We create 8 goroutines reading & writing to the handler concurrently. If
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// a race condition occurs the test will fail and halt.
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for i := 0; i < count; i++ {
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wg.Add(1)
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go func() {
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defer wg.Done()
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for hrFunc := range hrFuncMap {
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select {
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case <-ctx.Done():
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default:
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}
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hr.Store(hrFunc)
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got := hr.load()
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_, ok := hrFuncMap[got]
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if !ok {
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// This will trigger a race failure / exit test
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t.Fatal("unknown handler returned from load()")
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return
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}
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}
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}()
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}
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wg.Wait()
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}
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