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waitgroup.go
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waitgroup.go
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/*-
* Copyright 2015 Grammarly, Inc.
*
* 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 util
// TODO: document and write tests
import (
"fmt"
"time"
)
// ErrorWaitGroup is a wait group that returns the first error occured
type ErrorWaitGroup struct {
ch chan error
}
// NewErrorWaitGroup makes a new ErrorWaitGroup of size n
func NewErrorWaitGroup(size int) *ErrorWaitGroup {
return &ErrorWaitGroup{
ch: make(chan error, size),
}
}
// Done pops a number from the wait group
func (wg *ErrorWaitGroup) Done(err error) {
wg.ch <- err
return
}
// Wait blogs until the wait group finished and returns the error if any
func (wg *ErrorWaitGroup) Wait() (err error) {
n := cap(wg.ch)
if n == 0 {
return nil
}
for {
if resErr := <-wg.ch; resErr != nil && err == nil {
err = resErr
}
if n--; n == 0 {
break
}
}
return err
}
// WaitFor same as Wait but with the timeout
func (wg *ErrorWaitGroup) WaitFor(timeout time.Duration) error {
n := cap(wg.ch)
if n == 0 {
return nil
}
for {
select {
case err := <-wg.ch:
if err != nil {
return err
}
case <-time.After(timeout):
return fmt.Errorf("timeout %s", timeout)
}
if n--; n == 0 {
break
}
}
return nil
}