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controller.go
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controller.go
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package fipcontroller
import (
"context"
"fmt"
"os"
"time"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/util/retry"
"github.com/hetznercloud/hcloud-go/hcloud"
"github.com/sirupsen/logrus"
"k8s.io/client-go/kubernetes"
"github.com/cbeneke/hcloud-fip-controller/internal/pkg/configuration"
)
// Controller is the main struct used for all other functions in this package.
// Holds all client configurations and loggers
type Controller struct {
HetznerClient *hcloud.Client
KubernetesClient kubernetes.Interface
Configuration *configuration.Configuration
Logger *logrus.Logger
Backoff wait.Backoff
}
// NewController creates a new Controller and with it the client configurations and loggers
func NewController(config *configuration.Configuration) (*Controller, error) {
// Validate controller config
if err := config.Validate(); err != nil {
return nil, fmt.Errorf("controller config invalid: %v", err)
}
hetznerClient, err := newHetznerClient(config.HcloudAPIToken)
if err != nil {
return nil, fmt.Errorf("could not initialise hetzner client: %v", err)
}
kubernetesClient, err := newKubernetesClient()
if err != nil {
return nil, fmt.Errorf("could not initialise kubernetes client: %v", err)
}
logger := logrus.New()
logger.SetFormatter(&logrus.TextFormatter{
DisableColors: true,
FullTimestamp: true,
})
logger.SetReportCaller(true)
logger.SetOutput(os.Stdout)
loglevel, err := logrus.ParseLevel(config.LogLevel)
if err != nil {
return nil, fmt.Errorf("could not parse log level: %v", err)
}
logger.SetLevel(loglevel)
backoff := wait.Backoff{
Duration: config.BackoffDuration,
Factor: config.BackoffFactor,
Steps: config.BackoffSteps,
}
return &Controller{
HetznerClient: hetznerClient,
KubernetesClient: kubernetesClient,
Configuration: config,
Logger: logger,
Backoff: backoff,
}, nil
}
// Run updates Floating IPs once initially and every 30s afterwards
//
// === Main Thread ===
func (controller *Controller) Run(ctx context.Context) error {
if err := controller.UpdateFloatingIPs(ctx); err != nil {
return err
}
controller.Logger.Info("Initialization complete. Starting reconciliation")
for {
select {
case <-ctx.Done():
controller.Logger.Info("Context Done. Shutting down")
return nil
case <-time.After(30 * time.Second):
if err := controller.UpdateFloatingIPs(ctx); err != nil {
return err
}
}
}
}
// UpdateFloatingIPs searches for running hetzner cloud servers and sort them by fewest assigned floating ips.
// It then (re)assigns all unassigned ips or ips that are assigned to non running servers to the sorted running serves.
func (controller *Controller) UpdateFloatingIPs(ctx context.Context) error {
controller.Logger.Debugf("Checking floating IPs")
// Get running servers for floating ip assignment
nodeAddressList, err := controller.nodeAddressList(ctx, controller.Configuration.NodeAddressType)
if err != nil {
return fmt.Errorf("could not get addressList for active kubernetes nodes: %v", err)
}
if nodeAddressList == nil || len(nodeAddressList) < 1 {
return fmt.Errorf("Could not find any ips")
}
runningServers, err := controller.servers(ctx, nodeAddressList)
if err != nil {
return fmt.Errorf("Could not get server objects for addressList: %v", err)
}
if runningServers == nil || len(runningServers) < 1 {
return fmt.Errorf("No server objects were found")
}
// Get floatingIPs from config if specified, otherwise from hetzner api
floatingIPs, err := controller.getFloatingIPs(ctx)
if err != nil {
return fmt.Errorf("Could not get floatingIPs: %v", err)
}
for _, floatingIP := range floatingIPs {
controller.Logger.Debugf("Checking floating IP: %s", floatingIP.IP.String())
// (Re)assign floatingIP if no server is assigned or the assigned server is not running
// Since we already have all running server in a slice we can just search through it
if floatingIP.Server == nil || !hasServerByID(runningServers, floatingIP.Server) {
// Get the server with the lowest amount of fips (cant be nil since we know that servers can't be empty)
server := findServerWithLowestFIP(runningServers)
controller.Logger.Infof("Switching address '%s' to server '%s'", floatingIP.IP.String(), server.Name)
var response *hcloud.Response
err = retry.OnError(controller.Backoff, alwaysRetry, func() error {
_, response, err = controller.HetznerClient.FloatingIP.Assign(ctx, floatingIP, server)
return err
})
if err != nil {
return fmt.Errorf("could not update floating IP '%s': %v", floatingIP.IP.String(), err)
}
if response.StatusCode != 201 {
return fmt.Errorf("could not update floating IP '%s': Got HTTP Code %d, expected 201", floatingIP.IP.String(), response.StatusCode)
}
// Add placeholder floating ip to server so that findServerWithLowestFIP will always get a correct server
server.PublicNet.FloatingIPs = append(server.PublicNet.FloatingIPs, &hcloud.FloatingIP{})
}
}
return nil
}
// Find the server with the lowest amount of floating IPs
func findServerWithLowestFIP(servers []*hcloud.Server) *hcloud.Server {
if len(servers) < 1 {
return nil
}
server := servers[0]
for _, s := range servers {
if len(s.PublicNet.FloatingIPs) < len(server.PublicNet.FloatingIPs) {
server = s
}
}
return server
}
// Checks for a server in a slice by its id
// Returns true the server was found
func hasServerByID(slice []*hcloud.Server, val *hcloud.Server) bool {
for _, item := range slice {
if item.ID == val.ID {
return true
}
}
return false
}
func alwaysRetry(_ error) bool {
return true
}