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subnet_collector.go
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subnet_collector.go
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package ipam
import (
"context"
"net"
"reflect"
"sync"
infrastructurev1alpha3 "github.com/giantswarm/apiextensions/v6/pkg/apis/infrastructure/v1alpha3"
"github.com/giantswarm/ipam"
"github.com/giantswarm/microerror"
"github.com/giantswarm/micrologger"
"golang.org/x/sync/errgroup"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
ctrlClient "sigs.k8s.io/controller-runtime/pkg/client"
"github.com/giantswarm/aws-operator/v16/service/controller/controllercontext"
"github.com/giantswarm/aws-operator/v16/service/controller/key"
)
type SubnetCollectorConfig struct {
CtrlClient ctrlClient.Client
Logger micrologger.Logger
NetworkRange net.IPNet
}
type SubnetCollector struct {
ctrlClient ctrlClient.Client
logger micrologger.Logger
networkRange net.IPNet
}
func NewSubnetCollector(config SubnetCollectorConfig) (*SubnetCollector, error) {
if config.CtrlClient == nil {
return nil, microerror.Maskf(invalidConfigError, "%T.CtrlClient must not be empty", config)
}
if config.Logger == nil {
return nil, microerror.Maskf(invalidConfigError, "%T.Logger must not be empty", config)
}
if reflect.DeepEqual(config.NetworkRange, net.IPNet{}) {
return nil, microerror.Maskf(invalidConfigError, "%T.NetworkRange must not be empty", config)
}
c := &SubnetCollector{
ctrlClient: config.CtrlClient,
logger: config.Logger,
networkRange: config.NetworkRange,
}
return c, nil
}
func (c *SubnetCollector) Collect(ctx context.Context, networkRange net.IPNet) ([]net.IPNet, error) {
var err error
var mutex sync.Mutex
var reservedSubnets []net.IPNet
g := &errgroup.Group{}
g.Go(func() error {
c.logger.Debugf(ctx, "finding allocated subnets from Cluster CRs")
subnets, err := c.getSubnetsFromClusters(ctx)
if err != nil {
return microerror.Mask(err)
}
mutex.Lock()
reservedSubnets = append(reservedSubnets, subnets...)
mutex.Unlock()
c.logger.Debugf(ctx, "found allocated subnets from Cluster CRs")
return nil
})
g.Go(func() error {
c.logger.Debugf(ctx, "finding allocated subnets from MachineDeployment CRs")
subnets, err := c.getSubnetsFromMachineDeployments(ctx)
if err != nil {
return microerror.Mask(err)
}
mutex.Lock()
reservedSubnets = append(reservedSubnets, subnets...)
mutex.Unlock()
c.logger.Debugf(ctx, "found allocated subnets from MachineDeployment CRs")
return nil
})
g.Go(func() error {
c.logger.Debugf(ctx, "finding allocated subnets from VPCs")
subnets, err := c.getSubnetsFromVPCs(ctx)
if err != nil {
return microerror.Mask(err)
}
mutex.Lock()
reservedSubnets = append(reservedSubnets, subnets...)
mutex.Unlock()
c.logger.Debugf(ctx, "found allocated subnets from VPCs")
return nil
})
err = g.Wait()
if err != nil {
return nil, microerror.Mask(err)
}
// Here we decide which network range to consider when collected allocated
// subnets. The given network range is the custom network range configured
// in the NetworkPool CR. If it is empty we simply fall back to the network
// range configured in the control plane.
var nr net.IPNet
{
nr = networkRange
if nr.IP.Equal(net.IP{}) {
nr = c.networkRange
}
}
reservedSubnets = ipam.CanonicalizeSubnets(nr, reservedSubnets)
return reservedSubnets, nil
}
func (c *SubnetCollector) getSubnetsFromClusters(ctx context.Context) ([]net.IPNet, error) {
clusterList := &infrastructurev1alpha3.AWSClusterList{}
err := c.ctrlClient.List(ctx, clusterList, &ctrlClient.ListOptions{Raw: &metav1.ListOptions{}})
if err != nil {
return nil, microerror.Mask(err)
}
var results []net.IPNet
for _, c := range clusterList.Items {
cidr := key.StatusClusterNetworkCIDR(c)
if cidr == "" {
continue
}
_, n, err := net.ParseCIDR(cidr)
if err != nil {
return nil, microerror.Mask(err)
}
results = append(results, *n)
}
return results, nil
}
func (c *SubnetCollector) getSubnetsFromMachineDeployments(ctx context.Context) ([]net.IPNet, error) {
machineDeploymentList := &infrastructurev1alpha3.AWSMachineDeploymentList{}
err := c.ctrlClient.List(ctx, machineDeploymentList, &ctrlClient.ListOptions{Raw: &metav1.ListOptions{}})
if err != nil {
return nil, microerror.Mask(err)
}
var results []net.IPNet
for _, md := range machineDeploymentList.Items {
cidr := key.MachineDeploymentSubnet(md)
if cidr == "" {
continue
}
_, n, err := net.ParseCIDR(cidr)
if err != nil {
return nil, microerror.Mask(err)
}
results = append(results, *n)
}
return results, nil
}
func (c *SubnetCollector) getSubnetsFromVPCs(ctx context.Context) ([]net.IPNet, error) {
cc, err := controllercontext.FromContext(ctx)
if err != nil {
return nil, microerror.Mask(err)
}
out, err := cc.Client.TenantCluster.AWS.EC2.DescribeSubnets(nil)
if err != nil {
return nil, microerror.Mask(err)
}
var results []net.IPNet
for _, subnet := range out.Subnets {
_, n, err := net.ParseCIDR(*subnet.CidrBlock)
if err != nil {
return nil, microerror.Mask(err)
}
results = append(results, *n)
}
return results, nil
}