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utils.go
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/
utils.go
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// Copyright 2018 MSolution.IO
//
// 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 plugins_account_anattached_eip
import (
"sync"
"github.com/aws/aws-sdk-go/service/ec2"
)
type EIP struct {
Region *string
EIPRes *ec2.DescribeAddressesOutput
Err error
}
// merge function from https://blog.golang.org/pipelines#TOC_4
// It allows to merge many chans to one.
func merge(cs ...<-chan EIP) <-chan EIP {
var wg sync.WaitGroup
out := make(chan EIP)
// Start an output goroutine for each input channel in cs. The output
// copies values from c to out until c is closed, then calls wg.Done.
output := func(c <-chan EIP) {
for n := range c {
out <- n
}
wg.Done()
}
wg.Add(len(cs))
for _, c := range cs {
go output(c)
}
// Start a goroutine to close out once all the output goroutines are
// done. This must start after the wg.Add call.
go func() {
wg.Wait()
close(out)
}()
return out
}