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package main
import (
"context"
"flag"
"net"
"os"
"os/signal"
"regexp"
"syscall"
"time"
"github.com/linkerd/linkerd2/pkg/config"
"github.com/linkerd/linkerd2/pkg/admin"
"github.com/linkerd/linkerd2/pkg/charts/linkerd2"
"github.com/linkerd/linkerd2/pkg/flags"
"github.com/linkerd/linkerd2/pkg/healthcheck"
"github.com/linkerd/linkerd2/pkg/k8s"
"github.com/linkerd/linkerd2/pkg/trace"
"github.com/linkerd/linkerd2/viz/metrics-api/client"
"github.com/linkerd/linkerd2/web/srv"
log "github.com/sirupsen/logrus"
)
func main() {
cmd := flag.NewFlagSet("public-api", flag.ExitOnError)
addr := cmd.String("addr", ":8084", "address to serve on")
metricsAddr := cmd.String("metrics-addr", ":9994", "address to serve scrapable metrics on")
vizAPIAddr := cmd.String("linkerd-metrics-api-addr", "127.0.0.1:8085", "address of the linkerd-metrics-api service")
grafanaAddr := cmd.String("grafana-addr", "", "address of the linkerd-grafana service")
grafanaExternalAddr := cmd.String("grafana-external-addr", "", "address of the external grafana service")
grafanaPrefix := cmd.String("grafana-prefix", "", "prefix for Grafana dashboard UID's")
jaegerAddr := cmd.String("jaeger-addr", "", "address of the jaeger service")
templateDir := cmd.String("template-dir", "templates", "directory to search for template files")
staticDir := cmd.String("static-dir", "app/dist", "directory to search for static files")
reload := cmd.Bool("reload", true, "reloading set to true or false")
controllerNamespace := cmd.String("controller-namespace", "linkerd", "namespace in which Linkerd is installed")
enforcedHost := cmd.String("enforced-host", "", "regexp describing the allowed values for the Host header; protects from DNS-rebinding attacks")
kubeConfigPath := cmd.String("kubeconfig", "", "path to kube config")
clusterDomain := cmd.String("cluster-domain", "", "kubernetes cluster domain")
enablePprof := cmd.Bool("enable-pprof", false, "Enable pprof endpoints on the admin server")
traceCollector := flags.AddTraceFlags(cmd)
flags.ConfigureAndParse(cmd, os.Args[1:])
ready := false
adminServer := admin.NewServer(*metricsAddr, *enablePprof, &ready)
go func() {
log.Infof("starting admin server on %s", *metricsAddr)
if err := adminServer.ListenAndServe(); err != nil {
log.Errorf("failed to start web admin server: %s", err)
}
}()
ctx := context.Background()
_, _, err := net.SplitHostPort(*vizAPIAddr) // Verify vizAPIAddr is of the form host:port.
if err != nil {
log.Fatalf("failed to parse metrics API server address: %s", *vizAPIAddr)
}
client, err := client.NewInternalClient(*vizAPIAddr)
if err != nil {
log.Fatalf("failed to construct client for viz API server URL %s", *vizAPIAddr)
}
if *clusterDomain == "" {
*clusterDomain = "cluster.local"
log.Warnf("expected cluster domain through args (falling back to %s)", *clusterDomain)
}
k8sAPI, err := k8s.NewAPI(*kubeConfigPath, "", "", []string{}, 0)
if err != nil {
log.Fatalf("failed to construct Kubernetes API client: [%s]", err)
}
// Setup health checker
checks := []healthcheck.CategoryID{
healthcheck.KubernetesAPIChecks,
healthcheck.KubernetesVersionChecks,
healthcheck.LinkerdConfigChecks,
healthcheck.LinkerdControlPlaneExistenceChecks,
healthcheck.LinkerdVersionChecks,
healthcheck.LinkerdControlPlaneVersionChecks,
}
hc := healthcheck.NewHealthChecker(checks, &healthcheck.Options{
ControlPlaneNamespace: *controllerNamespace,
KubeConfig: *kubeConfigPath,
})
uuid, version := getUUIDAndVersion(ctx, k8sAPI, *controllerNamespace)
stop := make(chan os.Signal, 1)
signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
if *traceCollector != "" {
if err := trace.InitializeTracing("web", *traceCollector); err != nil {
log.Warnf("failed to initialize tracing: %s", err)
}
}
reHost, err := regexp.Compile(*enforcedHost)
if err != nil {
log.Fatalf("invalid --enforced-host parameter: %s", err)
}
server := srv.NewServer(*addr, *grafanaAddr, *grafanaExternalAddr, *grafanaPrefix, *jaegerAddr, *templateDir, *staticDir, uuid, version,
*controllerNamespace, *clusterDomain, *reload, reHost, client, k8sAPI, hc)
go func() {
log.Infof("starting HTTP server on %+v", *addr)
if err := server.ListenAndServe(); err != nil {
log.Errorf("failed to start web HTTP server: %s", err)
}
}()
ready = true
<-stop
log.Infof("shutting down HTTP server on %+v", *addr)
ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
defer cancel()
server.Shutdown(ctx)
adminServer.Shutdown(ctx)
}
func getUUIDAndVersion(ctx context.Context, k8sAPI *k8s.KubernetesAPI, controllerNamespace string) (string, string) {
var uuid string
var version string
cm, err := config.FetchLinkerdConfigMap(ctx, k8sAPI, controllerNamespace)
if err != nil {
log.Errorf("Failed to fetch linkerd-config: %s", err)
} else {
uuid = string(cm.GetUID())
values, err := linkerd2.ValuesFromConfigMap(cm)
if err != nil {
log.Errorf("failed to load values from linkerd-config: %s", err)
} else {
version = values.LinkerdVersion
}
}
return uuid, version
}