vimzh
57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
//go:build race
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package websocket
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import (
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"context"
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"sync"
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"testing"
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)
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// TestDispatcher_ConcurrentRegisterAndDispatch exercises the Dispatcher
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// from many goroutines at once. Its purpose is to surface a data race on
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// the underlying handlers map when run under the race detector; the
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// //go:build race tag scopes the test to `go test -race` runs (which CI
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// uses for the backend) so the stress is not paid on plain `go test`
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// invocations where it would add wall time without observing the race.
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func TestDispatcher_ConcurrentRegisterAndDispatch(t *testing.T) {
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d := NewDispatcher()
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const goroutines = 16
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const ops = 200
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noop := HandlerFunc(func(_ context.Context, msg *Message) (*Message, error) {
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return &Message{ID: msg.ID, Action: msg.Action}, nil
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})
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var wg sync.WaitGroup
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wg.Add(goroutines * 2)
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for g := 0; g < goroutines; g++ {
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go func() {
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defer wg.Done()
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for i := 0; i < ops; i++ {
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// Alternate between Register and RegisterFunc so both
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// write paths are exercised under -race.
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if i%2 == 0 {
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d.Register("action", noop)
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} else {
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d.RegisterFunc("action", noop)
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}
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}
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}()
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go func() {
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defer wg.Done()
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for i := 0; i < ops; i++ {
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_, _ = d.Dispatch(context.Background(), &Message{
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ID: "x",
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Action: "action",
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})
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_ = d.HasHandler("action")
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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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