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package main

import (

"context"

"flag"

"fmt"

"os"

"os/signal"

"syscall"

"time"

log "github.com/sirupsen/logrus"

dnsv1alpha1 "go.miloapis.com/dns-operator/api/v1alpha1"

_ "golang.org/x/crypto/x509roots/fallback"

"k8s.io/apimachinery/pkg/runtime"

"k8s.io/client-go/kubernetes/scheme"

"k8s.io/client-go/rest"

"k8s.io/client-go/tools/clientcmd"

"sigs.k8s.io/controller-runtime/pkg/client"

"go.datumapis.com/external-dns-webhook/internal/provider"

)

func main() {

var (

ownerID string

namespace string

namespaceLabelSelector string

kubeconfig string

port int

bindAddress string

metricsPort int

logLevel string

dryRun bool

configPath string

applyTimeout time.Duration

applyConcurrency int

)

flag.StringVar(&ownerID, "owner-id", "", "Owner ID to identify this ExternalDNS instance (required)")

flag.StringVar(&namespace, "namespace", "", "Specific namespace to watch (empty means all namespaces)")

flag.StringVar(&namespaceLabelSelector, "namespace-label-selector", "", "Label selector to filter namespaces to watch")

flag.StringVar(&kubeconfig, "kubeconfig", "", "Path to kubeconfig file (empty uses in-cluster config)")

flag.IntVar(&port, "port", 8888, "HTTP server port for webhook API")

flag.StringVar(&bindAddress, "bind-address", "0.0.0.0", "Address to bind the webhook HTTP server")

flag.IntVar(&metricsPort, "metrics-port", 8080, "Port for Prometheus metrics and health checks")

flag.StringVar(&logLevel, "log-level", "info", "Log level (debug, info, warn, error)")

flag.BoolVar(&dryRun, "dry-run", false, "Dry-run mode: do not make actual DNS changes")

flag.StringVar(&configPath, "config", "", "Path to YAML config file for additional zone sources")

flag.DurationVar(&applyTimeout, "apply-timeout", 5*time.Minute, "Maximum time to spend applying one batch of record changes; changes not reached in time are retried on the next sync")

flag.IntVar(&applyConcurrency, "apply-concurrency", 4, "Number of record changes applied in parallel")

flag.Parse()

cfg := &provider.Config{

OwnerID: ownerID,

Port: port,

BindAddress: bindAddress,

MetricsPort: metricsPort,

LogLevel: logLevel,

DryRun: dryRun,

ApplyTimeout: applyTimeout,

ApplyConcurrency: applyConcurrency,

}

if configPath != "" {

zoneSources, err := provider.LoadZoneSources(configPath)

if err != nil {

log.Fatalf("Failed to load config: %v", err)

}

cfg.ZoneSources = zoneSources

}

// If no zone sources from config file, create a default source from flags

if len(cfg.ZoneSources) == 0 {

cfg.ZoneSources = []provider.ZoneSourceConfig{{

Name: "default",

Kubeconfig: kubeconfig,

Namespace: namespace,

NamespaceLabelSelector: namespaceLabelSelector,

}}

}

if applyTimeout <= 0 || applyConcurrency <= 0 {

fmt.Fprintln(os.Stderr, "error: --apply-timeout and --apply-concurrency must be positive")

os.Exit(1)

}

if cfg.OwnerID == "" {

fmt.Fprintln(os.Stderr, "error: --owner-id is required")

flag.Usage()

os.Exit(1)

}

level, err := log.ParseLevel(cfg.LogLevel)

if err != nil {

log.Fatalf("Invalid log level: %v", err)

}

log.SetLevel(level)

log.SetFormatter(&log.TextFormatter{FullTimestamp: true})

log.Infof("Starting Datum DNS webhook provider (owner: %s, sources: %d, dry-run: %v)",

cfg.OwnerID, len(cfg.ZoneSources), cfg.DryRun)

sources, err := buildZoneSources(cfg)

if err != nil {

log.Fatalf("Failed to build zone sources: %v", err)

}

providerInstance, err := provider.NewProvider(cfg, cfg.OwnerID, sources)

if err != nil {

log.Fatalf("Failed to create provider: %v", err)

}

ctx, cancel := context.WithCancel(context.Background())

defer cancel()

if err := providerInstance.Start(ctx); err != nil {

log.Fatalf("Failed to start provider: %v", err)

}

server := provider.NewServer(providerInstance, cfg)

sigChan := make(chan os.Signal, 1)

signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)

go func() {

sig := <-sigChan

log.Infof("Received signal %v, initiating shutdown...", sig)

cancel()

shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 30*time.Second)

defer shutdownCancel()

if err := server.Shutdown(shutdownCtx); err != nil {

log.Errorf("Server shutdown error: %v", err)

}

}()

if err := server.Start(ctx); err != nil {

log.Fatalf("Server error: %v", err)

}

log.Info("Shutdown complete")

}

func buildZoneSources(cfg *provider.Config) ([]*provider.ZoneSource, error) {

logger := log.StandardLogger()

sources := make([]*provider.ZoneSource, 0, len(cfg.ZoneSources))

for _, srcCfg := range cfg.ZoneSources {

k8sClient, err := createKubernetesClient(srcCfg.Kubeconfig)

if err != nil {

return nil, fmt.Errorf("failed to create K8s client for source %q: %w", srcCfg.Name, err)

}

log.Infof("Zone source %q: K8s client ready (kubeconfig=%q)", srcCfg.Name, srcCfg.Kubeconfig)

src := provider.NewZoneSource(srcCfg.Name, k8sClient, srcCfg, cfg, logger)

sources = append(sources, src)

}

return sources, nil

}

func createKubernetesClient(kubeconfigPath string) (client.Client, error) {

var config *rest.Config

var err error

if kubeconfigPath != "" {

config, err = clientcmd.BuildConfigFromFlags("", kubeconfigPath)

} else {

config, err = rest.InClusterConfig()

}

if err != nil {

return nil, err

}

runtimeScheme := runtime.NewScheme()

if err := scheme.AddToScheme(runtimeScheme); err != nil {

return nil, fmt.Errorf("failed to add core types to scheme: %w", err)

}

if err := dnsv1alpha1.AddToScheme(runtimeScheme); err != nil {

return nil, fmt.Errorf("failed to add Datum DNS types to scheme: %w", err)

}

return client.New(config, client.Options{Scheme: runtimeScheme})

}