134 lines
3.9 KiB
Go
134 lines
3.9 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package election
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import (
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"reflect"
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"testing"
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"github.com/coreos/go-etcd/etcd"
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etcdtesting "k8s.io/kubernetes/pkg/storage/etcd/testing"
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"k8s.io/kubernetes/pkg/tools"
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"k8s.io/kubernetes/pkg/watch"
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)
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func TestEtcdMasterOther(t *testing.T) {
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server := etcdtesting.NewEtcdTestClientServer(t)
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defer server.Terminate(t)
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path := "foo"
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if _, err := server.Client.Set(path, "baz", 0); err != nil {
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t.Errorf("unexpected error: %v", err)
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}
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master := NewEtcdMasterElector(server.Client)
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w := master.Elect(path, "bar")
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result := <-w.ResultChan()
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if result.Type != watch.Modified || result.Object.(Master) != "baz" {
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t.Errorf("unexpected event: %#v", result)
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}
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w.Stop()
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}
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func TestEtcdMasterNoOther(t *testing.T) {
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server := etcdtesting.NewEtcdTestClientServer(t)
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defer server.Terminate(t)
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path := "foo"
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master := NewEtcdMasterElector(server.Client)
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w := master.Elect(path, "bar")
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result := <-w.ResultChan()
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if result.Type != watch.Modified || result.Object.(Master) != "bar" {
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t.Errorf("unexpected event: %#v", result)
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}
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w.Stop()
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}
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// MockClient is wrapper aroung tools.EtcdClient.
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type MockClient struct {
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client tools.EtcdClient
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t *testing.T
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// afterGetFunc is called after each Get() call.
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afterGetFunc func()
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calls []string
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}
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func (m *MockClient) GetCluster() []string {
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return m.client.GetCluster()
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}
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func (m *MockClient) Get(key string, sort, recursive bool) (*etcd.Response, error) {
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m.calls = append(m.calls, "get")
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defer m.afterGetFunc()
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response, err := m.client.Get(key, sort, recursive)
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return response, err
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}
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func (m *MockClient) Set(key, value string, ttl uint64) (*etcd.Response, error) {
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return m.client.Set(key, value, ttl)
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}
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func (m *MockClient) Create(key, value string, ttl uint64) (*etcd.Response, error) {
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m.calls = append(m.calls, "create")
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return m.client.Create(key, value, ttl)
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}
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func (m *MockClient) CompareAndSwap(key, value string, ttl uint64, prevValue string, prevIndex uint64) (*etcd.Response, error) {
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return m.client.CompareAndSwap(key, value, ttl, prevValue, prevIndex)
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}
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func (m *MockClient) Delete(key string, recursive bool) (*etcd.Response, error) {
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return m.client.Delete(key, recursive)
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}
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func (m *MockClient) Watch(prefix string, waitIndex uint64, recursive bool, receiver chan *etcd.Response, stop chan bool) (*etcd.Response, error) {
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return m.client.Watch(prefix, waitIndex, recursive, receiver, stop)
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}
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func TestEtcdMasterNoOtherThenConflict(t *testing.T) {
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server := etcdtesting.NewEtcdTestClientServer(t)
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defer server.Terminate(t)
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// We set up the following scenario:
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// - after each Get() call, we write "baz" to a path
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// - this is simulating someone else writing a data
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// - the value written by someone else is the new value
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path := "foo"
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client := &MockClient{
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client: server.Client,
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t: t,
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afterGetFunc: func() {
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if _, err := server.Client.Set(path, "baz", 0); err != nil {
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t.Errorf("unexpected error: %v", err)
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}
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},
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calls: make([]string, 0),
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}
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master := NewEtcdMasterElector(client)
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w := master.Elect(path, "bar")
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result := <-w.ResultChan()
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if result.Type != watch.Modified || result.Object.(Master) != "baz" {
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t.Errorf("unexpected event: %#v", result)
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}
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w.Stop()
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expectedCalls := []string{"get", "create", "get"}
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if !reflect.DeepEqual(client.calls, expectedCalls) {
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t.Errorf("unexpected calls: %#v", client.calls)
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}
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}
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