/
subnets.go
184 lines (163 loc) · 4.65 KB
/
subnets.go
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package ec2
import (
"errors"
"fmt"
"sort"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/service/ec2"
"go.uber.org/zap"
)
const (
subnetCIDR1 = "192.168.64.0/18"
subnetCIDR2 = "192.168.128.0/18"
subnetCIDR3 = "192.168.192.0/18"
)
var zoneSfx = []string{"a", "b", "c"}
func (md *embedded) createSubnets() (err error) {
if md.cfg.VPCID == "" {
return errors.New("cannot create subnets without VPC ID")
}
if len(md.cfg.SubnetIDs) > 0 {
return fmt.Errorf("subnets already exist (%q)", md.cfg.SubnetIDs)
}
md.cfg.SubnetIDs = make([]string, 0, 3)
md.cfg.SubnetIDToAvailabilityZone = make(map[string]string, 3)
for i, cidr := range []string{subnetCIDR1, subnetCIDR2, subnetCIDR3} {
var output *ec2.CreateSubnetOutput
output, err = md.ec2.CreateSubnet(&ec2.CreateSubnetInput{
VpcId: aws.String(md.cfg.VPCID),
CidrBlock: aws.String(cidr),
AvailabilityZone: aws.String(fmt.Sprintf("%s%s", md.cfg.AWSRegion, zoneSfx[i%len(zoneSfx)])),
})
if err != nil {
return err
}
id := *output.Subnet.SubnetId
az := *output.Subnet.AvailabilityZone
md.cfg.SubnetIDs = append(md.cfg.SubnetIDs, id)
md.cfg.SubnetIDToAvailabilityZone[id] = az
md.lg.Info(
"created subnet",
zap.String("vpc-id", md.cfg.VPCID),
zap.String("subnet-id", id),
zap.String("availability-zone", az),
)
}
if md.cfg.AssociatePublicIPAddress {
if err = md.associatePublicIP(); err != nil {
return err
}
}
sort.Strings(md.cfg.SubnetIDs)
return md.cfg.Sync()
}
func (md *embedded) deleteSubnet() (err error) {
if md.cfg.VPCID == "" {
return errors.New("cannot delete subnets without VPC ID")
}
if len(md.cfg.SubnetIDs) == 0 {
return errors.New("cannot delete subnets without Subnet IDs")
}
for _, id := range md.cfg.SubnetIDs {
for i := 0; i < 10; i++ {
// TODO: handle "DependencyViolation: The subnet 'subnet-034524cbada087b8d' has dependencies and cannot be deleted"
_, err = md.ec2.DeleteSubnet(&ec2.DeleteSubnetInput{
SubnetId: aws.String(id),
})
if err == nil {
break
}
if request.IsErrorRetryable(err) || request.IsErrorThrottle(err) {
md.lg.Warn("failed to delete subnet, retrying...", zap.Error(err))
time.Sleep(5 * time.Second)
continue
}
// https://docs.aws.amazon.com/AWSEC2/latest/APIReference/errors-overview.html
awsErr, ok := err.(awserr.Error)
if ok {
if awsErr.Code() == "InvalidSubnetID.NotFound" {
md.lg.Info(
"subnet does not exist",
zap.String("subnet-id", id),
)
return nil
}
}
return err
}
if err != nil {
return err
}
md.lg.Info(
"deleted subnet",
zap.String("vpc-id", md.cfg.VPCID),
zap.String("subnet-id", id),
)
}
time.Sleep(2 * time.Second)
_, err = md.ec2.DescribeSubnets(&ec2.DescribeSubnetsInput{
SubnetIds: aws.StringSlice(md.cfg.SubnetIDs),
})
if err != nil {
// https://docs.aws.amazon.com/AWSEC2/latest/APIReference/errors-overview.html
awsErr, ok := err.(awserr.Error)
if ok && awsErr.Code() == "InvalidSubnetID.NotFound" {
return nil
}
return err
}
return fmt.Errorf("deleted subnets but %v still exists", md.cfg.SubnetIDs)
}
func (md *embedded) getSubnets() (err error) {
if md.cfg.VPCID == "" {
return errors.New("cannot get subnets without VPC ID")
}
if len(md.cfg.SubnetIDs) > 0 {
return fmt.Errorf("subnets already exist (%q)", md.cfg.SubnetIDs)
}
if err = md.enableDNSHostnames(); err != nil {
return err
}
var output *ec2.DescribeSubnetsOutput
output, err = md.ec2.DescribeSubnets(&ec2.DescribeSubnetsInput{
Filters: []*ec2.Filter{
{
Name: aws.String("vpc-id"),
Values: aws.StringSlice([]string{md.cfg.VPCID}),
},
},
})
if err != nil {
return err
}
md.cfg.SubnetIDs = make([]string, 0, len(output.Subnets))
md.cfg.SubnetIDToAvailabilityZone = make(map[string]string)
for _, sv := range output.Subnets {
md.cfg.SubnetIDs = append(md.cfg.SubnetIDs, *sv.SubnetId)
md.cfg.SubnetIDToAvailabilityZone[*sv.SubnetId] = *sv.AvailabilityZone
}
md.lg.Info(
"found subnets",
zap.String("vpc-id", md.cfg.VPCID),
zap.Strings("subnets", md.cfg.SubnetIDs),
)
return md.cfg.Sync()
}
func (md *embedded) associatePublicIP() (err error) {
for _, id := range md.cfg.SubnetIDs {
_, err = md.ec2.ModifySubnetAttribute(&ec2.ModifySubnetAttributeInput{
MapPublicIpOnLaunch: &ec2.AttributeBooleanValue{
Value: aws.Bool(true),
},
SubnetId: aws.String(id),
})
if err != nil {
return fmt.Errorf("failed to allow public IP assign for subnet %q (%v)", id, err)
}
md.lg.Debug("allowed public IP assign for subnet", zap.String("subnet-id", id))
}
return nil
}