/
aws.go
74 lines (62 loc) · 1.81 KB
/
aws.go
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// Copyright 2013 Matt Ho
//
// 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 awsenv
import (
"launchpad.net/goamz/aws"
goec2 "launchpad.net/goamz/ec2"
)
func Hosts(region aws.Region, tags map[string]string) ([]string, error) {
instances, err := Instances(region, tags)
if err != nil {
return nil, err
}
hosts := make([]string, 0)
for _, instance := range instances {
hosts = append(hosts, instance.DNSName)
}
return hosts, nil
}
func Instances(region aws.Region, tags map[string]string) ([]goec2.Instance, error) {
auth, err := aws.EnvAuth()
if err != nil {
return nil, err
}
ec2 := goec2.New(auth, region)
response, err := ec2.Instances(nil, nil)
if err != nil {
return nil, err
}
instances := make([]goec2.Instance, 0)
for _, reservation := range response.Reservations {
for _, instance := range reservation.Instances {
found := true
// convert the tags into a map[string]string
actual := map[string]string{}
for _, tag := range instance.Tags {
actual[tag.Key] = tag.Value
}
// now verify that all the requested values have been found
for key, value := range tags {
if actual[key] != value {
found = false
}
}
// if found, add this to the list
if found {
instances = append(instances, instance)
}
}
}
return instances, nil
}