Dmitriy Matrenichev 8a02ecd4cb
chore: add endpoints balancer controller
This PR adds support for creating a list of API endpoints (each is pair of host and port).

It gets them from
- Machine config cluster endpoint.
- Localhost with LocalAPIServerPort if machine is control panel.
- netip.Addr[0] and port from affiliates if they are control panels.

For #7191

Signed-off-by: Dmitriy Matrenichev <dmitry.matrenichev@siderolabs.com>
2023-06-05 20:47:52 -04:00

92 lines
2.5 KiB
Go

// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package k8s
import (
"context"
"fmt"
"net"
"net/netip"
"github.com/cosi-project/runtime/pkg/controller"
"github.com/cosi-project/runtime/pkg/safe"
"github.com/cosi-project/runtime/pkg/state"
"github.com/siderolabs/gen/slices"
"github.com/siderolabs/go-pointer"
"go.uber.org/zap"
"github.com/siderolabs/talos/pkg/machinery/resources/config"
"github.com/siderolabs/talos/pkg/machinery/resources/k8s"
)
// StaticEndpointController injects endpoints based on machine configuration.
type StaticEndpointController struct{}
// Name implements controller.Controller interface.
func (ctrl *StaticEndpointController) Name() string {
return "k8s.StaticEndpointController"
}
// Inputs implements controller.Controller interface.
func (ctrl *StaticEndpointController) Inputs() []controller.Input {
return []controller.Input{
{
Namespace: config.NamespaceName,
Type: config.MachineConfigType,
ID: pointer.To(config.V1Alpha1ID),
Kind: controller.InputWeak,
},
}
}
// Outputs implements controller.Controller interface.
func (ctrl *StaticEndpointController) Outputs() []controller.Output {
return []controller.Output{
{
Type: k8s.EndpointType,
Kind: controller.OutputShared,
},
}
}
// Run implements controller.Controller interface.
func (ctrl *StaticEndpointController) Run(ctx context.Context, r controller.Runtime, logger *zap.Logger) error {
for {
select {
case <-ctx.Done():
return nil
case <-r.EventCh():
}
machineConfig, err := safe.ReaderGetByID[*config.MachineConfig](ctx, r, config.V1Alpha1ID)
if err != nil {
if state.IsNotFoundError(err) {
continue
}
return fmt.Errorf("error getting machine config: %w", err)
}
cpHostname := machineConfig.Config().Cluster().Endpoint().Hostname()
var resolver net.Resolver
addrs, err := resolver.LookupNetIP(ctx, "ip", cpHostname)
if err != nil {
return fmt.Errorf("error resolving %q: %w", cpHostname, err)
}
addrs = slices.Map(addrs, netip.Addr.Unmap)
if err = safe.WriterModify(ctx, r, k8s.NewEndpoint(k8s.ControlPlaneNamespaceName, k8s.ControlPlaneKubernetesEndpointsID), func(endpoint *k8s.Endpoint) error {
endpoint.TypedSpec().Addresses = addrs
return nil
}); err != nil {
return fmt.Errorf("error modifying endpoint: %w", err)
}
}
}