mirror of https://github.com/k3s-io/k3s
145 lines
4.1 KiB
Go
145 lines
4.1 KiB
Go
/*
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Copyright 2014 Google Inc. 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 util
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import (
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"fmt"
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"sync"
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"testing"
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"github.com/coreos/go-etcd/etcd"
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)
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type EtcdResponseWithError struct {
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R *etcd.Response
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E error
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}
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type FakeEtcdClient struct {
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condWatchCompleted *sync.Cond
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condLock sync.Mutex
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Data map[string]EtcdResponseWithError
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DeletedKeys []string
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Err error
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t *testing.T
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Ix int
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// Will become valid after Watch is called; tester may write to it. Tester may
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// also read from it to verify that it's closed after injecting an error.
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WatchResponse chan *etcd.Response
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// Write to this to prematurely stop a Watch that is running in a goroutine.
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WatchInjectError chan<- error
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WatchStop chan<- bool
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}
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func MakeFakeEtcdClient(t *testing.T) *FakeEtcdClient {
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ret := &FakeEtcdClient{
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t: t,
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Data: map[string]EtcdResponseWithError{},
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}
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// There are three publicly accessible channels in FakeEtcdClient:
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// - WatchResponse
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// - WatchInjectError
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// - WatchStop
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// They are only available when Watch() is called. If users of
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// FakeEtcdClient want to use any of these channels, they have to call
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// WaitForWatchCompletion before any operation on these channels.
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// Internally, FakeEtcdClient use condWatchCompleted to indicate if the
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// Watch() method has been called. WaitForWatchCompletion() will wait
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// on condWatchCompleted. By the end of the Watch() method, it will
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// call Broadcast() on condWatchCompleted, which will awake any
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// goroutine waiting on this condition.
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ret.condWatchCompleted = sync.NewCond(&ret.condLock)
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return ret
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}
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func (f *FakeEtcdClient) AddChild(key, data string, ttl uint64) (*etcd.Response, error) {
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f.Ix = f.Ix + 1
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return f.Set(fmt.Sprintf("%s/%d", key, f.Ix), data, ttl)
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}
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func (f *FakeEtcdClient) Get(key string, sort, recursive bool) (*etcd.Response, error) {
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result := f.Data[key]
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if result.R == nil {
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f.t.Errorf("Unexpected get for %s", key)
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return &etcd.Response{}, &etcd.EtcdError{ErrorCode: 100} // Key not found
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}
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f.t.Logf("returning %v: %v %#v", key, result.R, result.E)
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return result.R, result.E
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}
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func (f *FakeEtcdClient) Set(key, value string, ttl uint64) (*etcd.Response, error) {
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result := EtcdResponseWithError{
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R: &etcd.Response{
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Node: &etcd.Node{
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Value: value,
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},
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},
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}
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f.Data[key] = result
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return result.R, f.Err
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}
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func (f *FakeEtcdClient) CompareAndSwap(key, value string, ttl uint64, prevValue string, prevIndex uint64) (*etcd.Response, error) {
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// TODO: Maybe actually implement compare and swap here?
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return f.Set(key, value, ttl)
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}
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func (f *FakeEtcdClient) Create(key, value string, ttl uint64) (*etcd.Response, error) {
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return f.Set(key, value, ttl)
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}
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func (f *FakeEtcdClient) Delete(key string, recursive bool) (*etcd.Response, error) {
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f.Data[key] = EtcdResponseWithError{
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R: &etcd.Response{
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Node: nil,
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},
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E: &etcd.EtcdError{ErrorCode: 100},
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}
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f.DeletedKeys = append(f.DeletedKeys, key)
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return &etcd.Response{}, f.Err
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}
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func (f *FakeEtcdClient) WaitForWatchCompletion() {
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f.condLock.Lock()
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defer f.condLock.Unlock()
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f.condWatchCompleted.Wait()
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}
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func (f *FakeEtcdClient) Watch(prefix string, waitIndex uint64, recursive bool, receiver chan *etcd.Response, stop chan bool) (*etcd.Response, error) {
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f.WatchResponse = receiver
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f.WatchStop = stop
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injectedError := make(chan error)
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defer close(injectedError)
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f.WatchInjectError = injectedError
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f.condWatchCompleted.Broadcast()
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select {
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case <-stop:
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return nil, etcd.ErrWatchStoppedByUser
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case err := <-injectedError:
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// Emulate etcd's behavior.
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close(receiver)
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return nil, err
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}
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// Never get here.
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return nil, nil
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}
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