forked from andersjanmyr/route53copy
/
main.go
175 lines (154 loc) · 4.26 KB
/
main.go
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package main
import (
"flag"
"fmt"
"log"
"os"
"path"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/service/route53"
)
func connect(profile string) *route53.Route53 {
return route53.New(&aws.Config{
Region: aws.String("eu-west-1"),
Credentials: credentials.NewCredentials(&credentials.SharedCredentialsProvider{
Profile: profile,
}),
})
}
func getHostedZone(service *route53.Route53, domain string) (*route53.HostedZone, error) {
params := &route53.ListHostedZonesByNameInput{
DNSName: aws.String(domain),
MaxItems: aws.String("1"),
}
resp, err := service.ListHostedZonesByName(params)
if err != nil {
return nil, err
}
zone := resp.HostedZones[0]
return zone, nil
}
func getResourceRecords(profile string, domain string) ([]*route53.ResourceRecordSet, error) {
service := connect(profile)
zone, err := getHostedZone(service, domain)
if err != nil {
return nil, err
}
params := &route53.ListResourceRecordSetsInput{
HostedZoneId: aws.String(*zone.Id),
}
var rrsets []*route53.ResourceRecordSet
for {
var resp *route53.ListResourceRecordSetsOutput
resp, err = service.ListResourceRecordSets(params)
if err != nil {
return nil, err
}
rrsets = append(rrsets, resp.ResourceRecordSets...)
if *resp.IsTruncated {
params.StartRecordName = resp.NextRecordName
params.StartRecordType = resp.NextRecordType
params.StartRecordIdentifier = resp.NextRecordIdentifier
} else {
break
}
}
return rrsets, nil
}
func createChanges(domain string, recordSets []*route53.ResourceRecordSet) []*route53.Change {
domain = normalizeDomain(domain)
var changes []*route53.Change
for _, recordSet := range recordSets {
if (*recordSet.Type == "NS" || *recordSet.Type == "SOA") && *recordSet.Name == domain {
continue
}
change := &route53.Change{
Action: aws.String("UPSERT"),
ResourceRecordSet: recordSet,
}
changes = append(changes, change)
}
return changes
}
func normalizeDomain(domain string) string {
if strings.HasSuffix(domain, ".") {
return domain
} else {
return domain + "."
}
}
func updateRecords(sourceProfile, destProfile, domain string, changes []*route53.Change) (*route53.ChangeInfo, error) {
service := connect(destProfile)
zone, err := getHostedZone(service, domain)
if err != nil {
return nil, err
}
params := &route53.ChangeResourceRecordSetsInput{
HostedZoneId: zone.Id,
ChangeBatch: &route53.ChangeBatch{
Changes: changes,
Comment: aws.String("Importing ALL records from " + sourceProfile),
},
}
resp, err := service.ChangeResourceRecordSets(params)
return resp.ChangeInfo, nil
}
func main() {
log.SetFlags(0)
var version bool
var dry bool
var help bool
program := path.Base(os.Args[0])
flag.BoolVar(&dry, "dry", false, "Don't make any changes")
flag.BoolVar(&help, "help", false, "Show help text")
flag.BoolVar(&version, "version", false, "Show version")
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s [options] <source_profile> <dest_profile> <domain>\n", program)
flag.PrintDefaults()
}
flag.Parse()
if help {
flag.Usage()
os.Exit(0)
}
if version {
fmt.Println(Version)
os.Exit(0)
}
args := flag.Args()
if len(args) < 3 {
fmt.Fprintf(os.Stderr, "Wrong number of arguments, %d < 3\n", len(args))
fmt.Fprintf(os.Stderr, "Usage: %s [options] <source_profile> <dest_profile> <domain>\n", program)
flag.PrintDefaults()
os.Exit(1)
}
sourceProfile := args[0]
destProfile := args[1]
domain := args[2]
recordSets, err := getResourceRecords(sourceProfile, domain)
if err != nil {
panic(err)
}
changes := createChanges(domain, recordSets)
log.Println("Number of records to copy", len(changes))
if dry {
log.Printf("Not copying records to %s since --dry is given\n", destProfile)
service := connect(destProfile)
zone, err := getHostedZone(service, domain)
if err != nil {
panic(err)
}
log.Printf("Destination profile contains %d records, including NS and SOA\n",
*zone.ResourceRecordSetCount)
} else {
changeInfo, err := updateRecords(sourceProfile, destProfile, domain, changes)
if err != nil {
panic(err)
}
log.Printf("%d records in '%s' are copied from %s to %s\n",
len(changes), domain, sourceProfile, destProfile)
log.Printf("%#v\n", changeInfo)
}
}