istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pkg/config/mesh/networks_watcher_test.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_test
    16  
    17  import (
    18  	"testing"
    19  	"time"
    20  
    21  	. "github.com/onsi/gomega"
    22  
    23  	meshconfig "istio.io/api/mesh/v1alpha1"
    24  	"istio.io/istio/pkg/config/mesh"
    25  	"istio.io/istio/pkg/filewatcher"
    26  )
    27  
    28  func TestNewNetworksWatcherWithBadInputShouldFail(t *testing.T) {
    29  	g := NewWithT(t)
    30  	_, err := mesh.NewNetworksWatcher(filewatcher.NewWatcher(), "")
    31  	g.Expect(err).ToNot(BeNil())
    32  }
    33  
    34  func TestNetworksWatcherShouldNotifyHandlers(t *testing.T) {
    35  	g := NewWithT(t)
    36  
    37  	path := newTempFile(t)
    38  	defer removeSilent(path)
    39  
    40  	n := meshconfig.MeshNetworks{
    41  		Networks: make(map[string]*meshconfig.Network),
    42  	}
    43  	writeMessage(t, path, &n)
    44  
    45  	w := newNetworksWatcher(t, path)
    46  	g.Expect(w.Networks()).To(Equal(&n))
    47  
    48  	doneCh := make(chan struct{}, 1)
    49  
    50  	var newN *meshconfig.MeshNetworks
    51  	w.AddNetworksHandler(func() {
    52  		newN = w.Networks()
    53  		close(doneCh)
    54  	})
    55  
    56  	// Change the file to trigger the update.
    57  	n.Networks["test"] = &meshconfig.Network{}
    58  	writeMessage(t, path, &n)
    59  
    60  	select {
    61  	case <-doneCh:
    62  		g.Expect(newN).To(Equal(&n))
    63  		g.Expect(w.Networks()).To(Equal(newN))
    64  		break
    65  	case <-time.After(time.Second * 5):
    66  		t.Fatal("timed out waiting for update")
    67  	}
    68  }
    69  
    70  func newNetworksWatcher(t *testing.T, filename string) mesh.NetworksWatcher {
    71  	t.Helper()
    72  	w, err := mesh.NewNetworksWatcher(filewatcher.NewWatcher(), filename)
    73  	if err != nil {
    74  		t.Fatal(err)
    75  	}
    76  	return w
    77  }