/
asg.go
126 lines (104 loc) · 2.94 KB
/
asg.go
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package main
import (
"log"
"sync"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/autoscaling"
"github.com/codegangsta/cli"
)
func teardownASG(c *cli.Context) {
opts := Opts(c)
api := autoscaling.New(&aws.Config{Region: aws.String(opts.Region)})
instances, err := findASGInstancesToTerminate(api, opts)
if err != nil {
log.Fatalln(err)
}
log.Printf("terminating %d autoscaling group(s)\n", len(instances))
if opts.Dry {
log.Println("dry run mode - no autoscaling groups will be terminages\n")
return
}
wg := &sync.WaitGroup{}
for _, instance := range instances {
wg.Add(1)
go terminateASG(api, instance, wg)
}
wg.Wait()
}
func terminateASG(api *autoscaling.AutoScaling, instance *autoscaling.Group, wg *sync.WaitGroup) error {
defer wg.Done()
// 1. set the number of instances to 0
_, err := api.UpdateAutoScalingGroup(&autoscaling.UpdateAutoScalingGroupInput{
AutoScalingGroupName: instance.AutoScalingGroupName,
DesiredCapacity: aws.Int64(0),
MaxSize: aws.Int64(0),
MinSize: aws.Int64(0),
})
if err != nil {
return err
}
// 2. wait until the instance count is 0
for {
instances, err := api.DescribeAutoScalingGroups(&autoscaling.DescribeAutoScalingGroupsInput{
AutoScalingGroupNames: []*string{instance.AutoScalingGroupName},
})
if err != nil {
return err
}
// instance already deleted? we're done
if len(instances.AutoScalingGroups) == 0 {
return nil
}
// no instances remaining in asg? break
if v := instances.AutoScalingGroups[0]; len(v.Instances) == 0 {
break
}
time.Sleep(15 * time.Second)
}
// 3. terminate the asg
log.Printf("deleting autoscaling group, %s\n", *instance.AutoScalingGroupName)
_, err = api.DeleteAutoScalingGroup(&autoscaling.DeleteAutoScalingGroupInput{
AutoScalingGroupName: instance.AutoScalingGroupName,
ForceDelete: aws.Bool(true),
})
if err != nil {
return err
}
log.Printf("deleting launch configuration, %s\n", *instance.LaunchConfigurationName)
_, err = api.DeleteLaunchConfiguration(&autoscaling.DeleteLaunchConfigurationInput{
LaunchConfigurationName: instance.LaunchConfigurationName,
})
if err != nil {
return err
}
return nil
}
func findASGInstancesToTerminate(api *autoscaling.AutoScaling, opts Options) ([]*autoscaling.Group, error) {
groups, err := api.DescribeAutoScalingGroups(&autoscaling.DescribeAutoScalingGroupsInput{})
if err != nil {
return nil, err
}
instances := []*autoscaling.Group{}
for _, asg := range groups.AutoScalingGroups {
if !hasASGTags(asg, "app", opts.App) {
continue
}
if !hasASGTags(asg, "env", opts.Env) {
continue
}
if hasASGTags(asg, "version", opts.Exclude) {
continue
}
instances = append(instances, asg)
}
return instances, nil
}
func hasASGTags(asg *autoscaling.Group, key, value string) bool {
for _, tag := range asg.Tags {
if *tag.Key == key && *tag.Value == value {
return true
}
}
return false
}