147 lines
3.7 KiB
Go
147 lines
3.7 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package eventchannel
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import (
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"fmt"
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"sync"
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"testing"
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"time"
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"github.com/golang/protobuf/proto"
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)
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// testEmitter is an emitter that can be used in tests. It records all events
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// emitted, and whether it has been closed.
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type testEmitter struct {
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// mu protects all fields below.
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mu sync.Mutex
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// events contains all emitted events.
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events []proto.Message
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// closed records whether Close() was called.
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closed bool
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}
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// Emit implements Emitter.Emit.
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func (te *testEmitter) Emit(msg proto.Message) (bool, error) {
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te.mu.Lock()
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defer te.mu.Unlock()
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te.events = append(te.events, msg)
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return false, nil
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}
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// Close implements Emitter.Close.
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func (te *testEmitter) Close() error {
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te.mu.Lock()
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defer te.mu.Unlock()
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if te.closed {
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return fmt.Errorf("closed called twice")
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}
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te.closed = true
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return nil
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}
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// testMessage implements proto.Message for testing.
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type testMessage struct {
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proto.Message
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// name is the name of the message, used by tests to compare messages.
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name string
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}
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func TestMultiEmitter(t *testing.T) {
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// Create three testEmitters, tied together in a multiEmitter.
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me := &multiEmitter{}
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var emitters []*testEmitter
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for i := 0; i < 3; i++ {
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te := &testEmitter{}
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emitters = append(emitters, te)
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me.AddEmitter(te)
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}
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// Emit three messages to multiEmitter.
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names := []string{"foo", "bar", "baz"}
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for _, name := range names {
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m := testMessage{name: name}
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if _, err := me.Emit(m); err != nil {
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t.Fatal("me.Emit(%v) failed: %v", m, err)
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}
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}
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// All three emitters should have all three events.
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for _, te := range emitters {
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if got, want := len(te.events), len(names); got != want {
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t.Fatalf("emitter got %d events, want %d", got, want)
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}
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for i, name := range names {
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if got := te.events[i].(testMessage).name; got != name {
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t.Errorf("emitter got message with name %q, want %q", got, name)
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}
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}
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}
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// Close multiEmitter.
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if err := me.Close(); err != nil {
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t.Fatal("me.Close() failed: %v", err)
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}
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// All testEmitters should be closed.
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for _, te := range emitters {
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if !te.closed {
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t.Errorf("te.closed got false, want true")
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}
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}
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}
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func TestRateLimitedEmitter(t *testing.T) {
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// Create a RateLimittedEmitter that wraps a testEmitter.
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te := &testEmitter{}
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max := float64(5) // events per second
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burst := 10 // events
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rle := RateLimitedEmitterFrom(te, max, burst)
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// Send 50 messages in one shot.
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for i := 0; i < 50; i++ {
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if _, err := rle.Emit(testMessage{}); err != nil {
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t.Fatalf("rle.Emit failed: %v", err)
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}
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}
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// We should have received only 10 messages.
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if got, want := len(te.events), 10; got != want {
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t.Errorf("got %d events, want %d", got, want)
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}
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// Sleep for a second and then send another 50.
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time.Sleep(1 * time.Second)
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for i := 0; i < 50; i++ {
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if _, err := rle.Emit(testMessage{}); err != nil {
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t.Fatalf("rle.Emit failed: %v", err)
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}
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}
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// We should have at least 5 more message, plus maybe a few more if the
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// test ran slowly.
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got, wantAtLeast, wantAtMost := len(te.events), 15, 20
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if got < wantAtLeast {
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t.Errorf("got %d events, want at least %d", got, wantAtLeast)
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}
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if got > wantAtMost {
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t.Errorf("got %d events, want at most %d", got, wantAtMost)
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}
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}
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