istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pkg/config/mesh/watcher_test_utils.go (about)

     1  // Copyright Istio Authors
     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 mesh
    16  
    17  import (
    18  	"errors"
    19  	"time"
    20  
    21  	meshconfig "istio.io/api/mesh/v1alpha1"
    22  )
    23  
    24  // only used for testing, exposes a blocking Update method that allows test environments to trigger meshConfig updates
    25  type TestWatcher struct {
    26  	internalWatcher
    27  	doneCh chan struct{} // used to implement a blocking Update method
    28  }
    29  
    30  func NewTestWatcher(meshConfig *meshconfig.MeshConfig) *TestWatcher {
    31  	w := &TestWatcher{
    32  		internalWatcher: internalWatcher{},
    33  	}
    34  	w.internalWatcher.MeshConfig.Store(meshConfig)
    35  	w.doneCh = make(chan struct{}, 1)
    36  	w.AddMeshHandler(func() {
    37  		w.doneCh <- struct{}{}
    38  	})
    39  	return w
    40  }
    41  
    42  // blocks until watcher handlers trigger
    43  func (t *TestWatcher) Update(meshConfig *meshconfig.MeshConfig, timeout time.Duration) error {
    44  	t.HandleMeshConfig(meshConfig)
    45  	select {
    46  	case <-t.doneCh:
    47  		return nil
    48  	case <-time.After(timeout):
    49  		return errors.New("timed out waiting for mesh.Watcher handler to trigger")
    50  	}
    51  }