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ec2ctrl.go
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ec2ctrl.go
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package main
import (
"bytes"
"encoding/csv"
"encoding/json"
"flag"
"fmt"
"os"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/olekukonko/tablewriter"
)
const (
AppVersion = "0.1.1"
)
var (
argProfile = flag.String("profile", "", "Profile 名を指定.")
argRegion = flag.String("region", "ap-northeast-1", "Region 名を指定.")
argEndpoint = flag.String("endpoint", "", "AWS API のエンドポイントを指定.")
argInstances = flag.String("instances", "", "Instance ID 又は Instance Tag 名を指定.")
argTags = flag.String("tags", "", "Tag Key 及び Tag Value を指定.")
argStart = flag.Bool("start", false, "Instance を起動.")
argStop = flag.Bool("stop", false, "Instance を停止.")
argType = flag.String("type", "", "Instance タイプを指定.")
argVersion = flag.Bool("version", false, "バージョンを出力.")
argCsv = flag.Bool("csv", false, "CSV 形式で出力する")
argJson = flag.Bool("json", false, "JSON 形式で出力する")
argNameTagFilter = flag.String("tag-filter", "", "指定したキーワードを用いてインスタンスの出力を絞り込む. (Name タグを検索する)")
)
type Results struct {
Instances []Instance `json:"instances"`
}
type Instance struct {
Name string `json:"name"`
InstanceId string `json:"instance_id"`
InstanceType string `json:"instance_type"`
AZ string `json:"az"`
PrivateIp string `json:"private_ip"`
PublicIp string `json:"public_ip"`
Satate string `json:"state"`
InstanceStatus string `json:"instance_state"`
SystemStatus string `json:"system_state"`
}
func outputTbl(data [][]string) {
table := tablewriter.NewWriter(os.Stdout)
table.SetHeader([]string{"tag:Name", "InstanceId", "InstanceType",
"AZ", "PrivateIp", "PublicIp", "State",
"InstanceStatus", "SystemStatus"})
for _, value := range data {
table.Append(value)
}
table.Render()
}
func outputCsv(data [][]string) {
buf := new(bytes.Buffer)
w := csv.NewWriter(buf)
for _, record := range data {
if err := w.Write(record); err != nil {
fmt.Println("Write error: ", err)
return
}
w.Flush()
}
fmt.Println(buf.String())
}
func outputJson(data [][]string) {
var rs []Instance
for _, record := range data {
r := Instance{Name: record[0], InstanceId: record[1], InstanceType: record[2],
AZ: record[3], PrivateIp: record[4], PublicIp: record[5],
Satate: record[6], InstanceStatus: record[7], SystemStatus: record[8]}
rs = append(rs, r)
}
rj := Results{
Instances: rs,
}
b, err := json.Marshal(rj)
if err != nil {
fmt.Println("JSON Marshal error:", err)
return
}
os.Stdout.Write(b)
}
func awsEc2Client(profile string, region string) *ec2.EC2 {
var config aws.Config
if profile != "" {
creds := credentials.NewSharedCredentials("", profile)
config = aws.Config{Region: aws.String(region), Credentials: creds, Endpoint: aws.String(*argEndpoint)}
} else {
config = aws.Config{Region: aws.String(region), Endpoint: aws.String(*argEndpoint)}
}
sess := session.New(&config)
ec2Client := ec2.New(sess)
return ec2Client
}
func getInstanceStatus(ec2Client *ec2.EC2, instanceId string) (string, string) {
params := &ec2.DescribeInstanceStatusInput{
InstanceIds: []*string{
aws.String(instanceId),
},
}
res, err := ec2Client.DescribeInstanceStatus(params)
if err != nil {
fmt.Println(err.Error())
os.Exit(1)
}
var instance_status string
var system_status string
if len(res.InstanceStatuses) > 0 {
instance_status = *res.InstanceStatuses[0].InstanceStatus.Status
system_status = *res.InstanceStatuses[0].SystemStatus.Status
} else {
instance_status = "N/A"
system_status = "N/A"
}
return instance_status, system_status
}
func listInstances(ec2Client *ec2.EC2, instances []*string) {
params := &ec2.DescribeInstancesInput{
InstanceIds: instances,
}
allInstances := [][]string{}
for {
res, err := ec2Client.DescribeInstances(params)
if err != nil {
fmt.Println(err.Error())
os.Exit(1)
}
for _, r := range res.Reservations {
for _, i := range r.Instances {
var tag_name string
for _, t := range i.Tags {
if *t.Key == "Name" {
tag_name = *t.Value
}
}
if i.PublicIpAddress == nil {
i.PublicIpAddress = aws.String("Not assignment")
}
if i.PrivateIpAddress == nil {
i.PrivateIpAddress = aws.String("Not assignment")
}
instance_status, system_status := getInstanceStatus(ec2Client, *i.InstanceId)
instance := []string{
tag_name,
*i.InstanceId,
*i.InstanceType,
*i.Placement.AvailabilityZone,
*i.PrivateIpAddress,
*i.PublicIpAddress,
*i.State.Name,
instance_status,
system_status,
}
if *argNameTagFilter == "" {
allInstances = append(allInstances, instance)
} else {
if strings.Contains(tag_name, *argNameTagFilter) {
allInstances = append(allInstances, instance)
}
}
}
}
if res.NextToken == nil {
break
}
params.SetNextToken(*res.NextToken)
continue
}
if *argCsv == true {
outputCsv(allInstances)
} else if *argJson == true {
outputJson(allInstances)
} else {
outputTbl(allInstances)
}
}
func startInstances(ec2Client *ec2.EC2, instances []*string) {
params := &ec2.StartInstancesInput{
InstanceIds: instances,
}
result, err := ec2Client.StartInstances(params)
if err != nil {
fmt.Println(err.Error())
os.Exit(1)
}
for _, r := range result.StartingInstances {
fmt.Printf("%s を起動しました.\n", *r.InstanceId)
}
}
func stopInstances(ec2Client *ec2.EC2, instances []*string) {
params := &ec2.StopInstancesInput{
InstanceIds: instances,
}
// fmt.Println(params)
result, err := ec2Client.StopInstances(params)
if err != nil {
fmt.Println(err.Error())
os.Exit(1)
}
for _, r := range result.StoppingInstances {
fmt.Printf("%s を停止しました.\n", *r.InstanceId)
}
}
func modifyInstances(ec2Client *ec2.EC2, instances []*string, instance_type string) {
for _, instance := range instances {
params := &ec2.ModifyInstanceAttributeInput{
InstanceId: instance,
InstanceType: &ec2.AttributeValue{
Value: aws.String(instance_type),
},
}
// fmt.Println(params)
_, err := ec2Client.ModifyInstanceAttribute(params)
if err != nil {
fmt.Println(err.Error())
os.Exit(1)
}
fmt.Printf("%s のインスタンスタイプを %s に変更しました.\n", *instance, instance_type)
}
}
func stateInstances(ec2Client *ec2.EC2, instances []*string) {
listInstances(ec2Client, instances)
}
func ctrlInstances(ec2Client *ec2.EC2, instances []*string, operation string) {
listInstances(ec2Client, instances)
switch operation {
case "start":
fmt.Print("上記のインスタンスを起動しますか?(y/n): ")
case "stop":
fmt.Print("上記のインスタンスを停止しますか?(y/n): ")
}
var stdin string
fmt.Scan(&stdin)
switch stdin {
case "y", "Y":
switch operation {
case "start":
fmt.Println("EC2 を起動します.")
startInstances(ec2Client, instances)
case "stop":
fmt.Println("EC2 を停止します.")
stopInstances(ec2Client, instances)
}
case "n", "N":
fmt.Println("処理を停止します.")
os.Exit(0)
default:
fmt.Println("処理を停止します.")
os.Exit(0)
}
}
func getInstanceIds(ec2Client *ec2.EC2, instances string) []*string {
splitedInstances := strings.Split(instances, ",")
res, err := ec2Client.DescribeInstances(nil)
if err != nil {
fmt.Println(err.Error())
os.Exit(1)
}
var instanceIds []*string
for _, s := range splitedInstances {
for _, r := range res.Reservations {
for _, i := range r.Instances {
for _, t := range i.Tags {
if *t.Key == "Name" {
if *t.Value == s {
instanceIds = append(instanceIds, aws.String(*i.InstanceId))
}
}
}
if *i.InstanceId == s {
instanceIds = append(instanceIds, aws.String(*i.InstanceId))
}
}
}
}
return instanceIds
}
func main() {
flag.Parse()
if *argVersion {
fmt.Println(AppVersion)
os.Exit(0)
}
ec2Client := awsEc2Client(*argProfile, *argRegion)
var instances []*string
if *argInstances != "" {
instances = getInstanceIds(ec2Client, *argInstances)
if *argStart {
ctrlInstances(ec2Client, instances, "start")
} else if *argStop {
ctrlInstances(ec2Client, instances, "stop")
} else if *argType != "" {
modifyInstances(ec2Client, instances, *argType)
} else {
stateInstances(ec2Client, instances)
}
} else {
listInstances(ec2Client, nil)
}
}