github.com/livekit/protocol@v1.39.3/utils/configobserver_test.go (about)

     1  // Copyright 2024 LiveKit, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package utils
    16  
    17  import (
    18  	"os"
    19  	"testing"
    20  	"time"
    21  
    22  	"github.com/stretchr/testify/require"
    23  
    24  	"github.com/livekit/protocol/utils/configutil"
    25  )
    26  
    27  const testConfig0 = `foo: a`
    28  const testConfig1 = `foo: b`
    29  
    30  type TestConfig struct {
    31  	Foo string `yaml:"foo"`
    32  	Bar string `yaml:"bar"`
    33  }
    34  
    35  type testConfigBuilder struct{}
    36  
    37  func (testConfigBuilder) New() (*TestConfig, error) {
    38  	return &TestConfig{}, nil
    39  }
    40  
    41  func (testConfigBuilder) InitDefaults(c *TestConfig) error {
    42  	c.Bar = "c"
    43  	return nil
    44  }
    45  
    46  func TestConfigObserver(t *testing.T) {
    47  	f, err := os.CreateTemp(os.TempDir(), "lk-test-*.yaml")
    48  	t.Cleanup(func() {
    49  		_ = f.Close()
    50  	})
    51  	require.NoError(t, err)
    52  	_, err = f.WriteString(testConfig0)
    53  	require.NoError(t, err)
    54  
    55  	obs, conf, err := NewConfigObserver(f.Name(), testConfigBuilder{})
    56  	require.NoError(t, err)
    57  
    58  	require.Equal(t, "a", conf.Foo)
    59  	require.Equal(t, "c", conf.Bar)
    60  
    61  	atomicFoo := configutil.NewAtomicValue(obs, func(c *TestConfig) string {
    62  		return c.Foo
    63  	})
    64  
    65  	require.Equal(t, "a", atomicFoo.Load())
    66  
    67  	done := make(chan struct{})
    68  	obs.Observe(func(c *TestConfig) {
    69  		require.Equal(t, "b", c.Foo)
    70  		require.Equal(t, "c", c.Bar)
    71  		close(done)
    72  	})
    73  
    74  	_, err = f.WriteAt([]byte(testConfig1), 0)
    75  	require.NoError(t, err)
    76  
    77  	select {
    78  	case <-done:
    79  	case <-time.After(100 * time.Millisecond):
    80  		require.FailNow(t, "timed out waiting for config update")
    81  	}
    82  
    83  	require.Equal(t, "b", atomicFoo.Load())
    84  }