forked from kubernetes/kops
/
subnet.go
186 lines (154 loc) · 4.34 KB
/
subnet.go
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package awstasks
import (
"fmt"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/golang/glog"
"k8s.io/kops/upup/pkg/fi"
"k8s.io/kops/upup/pkg/fi/cloudup/awsup"
"k8s.io/kops/upup/pkg/fi/cloudup/terraform"
"k8s.io/kops/upup/pkg/fi/utils"
)
//go:generate fitask -type=Subnet
type Subnet struct {
Name *string
ID *string
VPC *VPC
AvailabilityZone *string
CIDR *string
Shared *bool
}
var _ fi.CompareWithID = &Subnet{}
func (e *Subnet) CompareWithID() *string {
return e.ID
}
func (e *Subnet) Find(c *fi.Context) (*Subnet, error) {
cloud := c.Cloud.(awsup.AWSCloud)
request := &ec2.DescribeSubnetsInput{}
if e.ID != nil {
request.SubnetIds = []*string{e.ID}
} else {
request.Filters = cloud.BuildFilters(e.Name)
}
response, err := cloud.EC2().DescribeSubnets(request)
if err != nil {
return nil, fmt.Errorf("error listing Subnets: %v", err)
}
if response == nil || len(response.Subnets) == 0 {
return nil, nil
}
if len(response.Subnets) != 1 {
glog.Fatalf("found multiple Subnets matching tags")
}
subnet := response.Subnets[0]
actual := &Subnet{
ID: subnet.SubnetId,
AvailabilityZone: subnet.AvailabilityZone,
VPC: &VPC{ID: subnet.VpcId},
CIDR: subnet.CidrBlock,
Name: findNameTag(subnet.Tags),
Shared: e.Shared,
}
glog.V(2).Infof("found matching subnet %q", *actual.ID)
e.ID = actual.ID
return actual, nil
}
func (e *Subnet) Run(c *fi.Context) error {
return fi.DefaultDeltaRunMethod(e, c)
}
func (s *Subnet) CheckChanges(a, e, changes *Subnet) error {
if a == nil {
if e.VPC == nil {
return fi.RequiredField("VPC")
}
if e.CIDR == nil {
// TODO: Auto-assign CIDR?
return fi.RequiredField("CIDR")
}
}
if a != nil {
if changes.VPC != nil {
// TODO: Do we want to destroy & recreate the subnet?
return fi.CannotChangeField("VPC")
}
if changes.AvailabilityZone != nil {
// TODO: Do we want to destroy & recreate the subnet?
return fi.CannotChangeField("AvailabilityZone")
}
if changes.CIDR != nil {
// TODO: Do we want to destroy & recreate the subnet?
return fi.CannotChangeField("CIDR")
}
}
return nil
}
func (_ *Subnet) RenderAWS(t *awsup.AWSAPITarget, a, e, changes *Subnet) error {
shared := fi.BoolValue(e.Shared)
if shared {
// Verify the subnet was found
if a == nil {
return fmt.Errorf("Subnet with id %q not found", fi.StringValue(e.ID))
}
return nil
}
if a == nil {
glog.V(2).Infof("Creating Subnet with CIDR: %q", *e.CIDR)
request := &ec2.CreateSubnetInput{
CidrBlock: e.CIDR,
AvailabilityZone: e.AvailabilityZone,
VpcId: e.VPC.ID,
}
response, err := t.Cloud.EC2().CreateSubnet(request)
if err != nil {
return fmt.Errorf("error creating subnet: %v", err)
}
e.ID = response.Subnet.SubnetId
}
return t.AddAWSTags(*e.ID, t.Cloud.BuildTags(e.Name))
}
func subnetSlicesEqualIgnoreOrder(l, r []*Subnet) bool {
var lIDs []string
for _, s := range l {
lIDs = append(lIDs, *s.ID)
}
var rIDs []string
for _, s := range r {
if s.ID == nil {
glog.V(4).Infof("Subnet ID not set; returning not-equal: %v", s)
return false
}
rIDs = append(rIDs, *s.ID)
}
return utils.StringSlicesEqualIgnoreOrder(lIDs, rIDs)
}
type terraformSubnet struct {
VPCID *terraform.Literal `json:"vpc_id"`
CIDR *string `json:"cidr_block"`
AvailabilityZone *string `json:"availability_zone"`
Tags map[string]string `json:"tags,omitempty"`
}
func (_ *Subnet) RenderTerraform(t *terraform.TerraformTarget, a, e, changes *Subnet) error {
cloud := t.Cloud.(awsup.AWSCloud)
shared := fi.BoolValue(e.Shared)
if shared {
// Not terraform owned / managed
return nil
}
tf := &terraformSubnet{
VPCID: e.VPC.TerraformLink(),
CIDR: e.CIDR,
AvailabilityZone: e.AvailabilityZone,
Tags: cloud.BuildTags(e.Name),
}
return t.RenderResource("aws_subnet", *e.Name, tf)
}
func (e *Subnet) TerraformLink() *terraform.Literal {
shared := fi.BoolValue(e.Shared)
if shared {
if e.ID == nil {
glog.Fatalf("ID must be set, if subnet is shared: %s", e)
}
glog.V(4).Infof("reusing existing subnet with id %q", *e.ID)
return terraform.LiteralFromStringValue(*e.ID)
}
return terraform.LiteralProperty("aws_subnet", *e.Name, "id")
}