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// Copyright 2015 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package testutil
import (
"errors"
"fmt"
"sync"
"time"
)
type Action struct {
Name string
Params []interface{}
}
type Recorder interface {
// Record publishes an Action (e.g., function call) which will
// be reflected by Wait() or Chan()
Record(a Action)
// Wait waits until at least n Actions are available or returns with error
Wait(n int) ([]Action, error)
// Action returns immediately available Actions
Action() []Action
// Chan returns the channel for actions published by Record
Chan() <-chan Action
}
// RecorderBuffered appends all Actions to a slice
type RecorderBuffered struct {
sync.Mutex
actions []Action
}
func (r *RecorderBuffered) Record(a Action) {
r.Lock()
r.actions = append(r.actions, a)
r.Unlock()
}
func (r *RecorderBuffered) Action() []Action {
r.Lock()
cpy := make([]Action, len(r.actions))
copy(cpy, r.actions)
r.Unlock()
return cpy
}
func (r *RecorderBuffered) Wait(n int) (acts []Action, err error) {
// legacy racey behavior
WaitSchedule()
acts = r.Action()
if len(acts) < n {
err = newLenErr(n, len(acts))
}
return acts, err
}
func (r *RecorderBuffered) Chan() <-chan Action {
ch := make(chan Action)
go func() {
acts := r.Action()
for i := range acts {
ch <- acts[i]
}
close(ch)
}()
return ch
}
// RecorderStream writes all Actions to an unbuffered channel
type recorderStream struct {
ch chan Action
waitTimeout time.Duration
}
func NewRecorderStream() Recorder {
return NewRecorderStreamWithWaitTimout(time.Duration(5 * time.Second))
}
func NewRecorderStreamWithWaitTimout(waitTimeout time.Duration) Recorder {
return &recorderStream{ch: make(chan Action), waitTimeout: waitTimeout}
}
func (r *recorderStream) Record(a Action) {
r.ch <- a
}
func (r *recorderStream) Action() (acts []Action) {
for {
select {
case act := <-r.ch:
acts = append(acts, act)
default:
return acts
}
}
}
func (r *recorderStream) Chan() <-chan Action {
return r.ch
}
func (r *recorderStream) Wait(n int) ([]Action, error) {
acts := make([]Action, n)
timeoutC := time.After(r.waitTimeout)
for i := 0; i < n; i++ {
select {
case acts[i] = <-r.ch:
case <-timeoutC:
acts = acts[:i]
return acts, newLenErr(n, i)
}
}
// extra wait to catch any Action spew
select {
case act := <-r.ch:
acts = append(acts, act)
case <-time.After(10 * time.Millisecond):
}
return acts, nil
}
func newLenErr(expected int, actual int) error {
s := fmt.Sprintf("len(actions) = %d, expected >= %d", actual, expected)
return errors.New(s)
}
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