pomerium/internal/cmd/pomerium/pomerium.go

// Package pomerium houses the main pomerium CLI command.
//
package pomerium

import (
	"context"
	"fmt"
	"net"
	"os"
	"os/signal"
	"syscall"

	envoy_service_auth_v2 "github.com/envoyproxy/go-control-plane/envoy/service/auth/v2"
	"golang.org/x/sync/errgroup"

	"github.com/pomerium/pomerium/authenticate"
	"github.com/pomerium/pomerium/authorize"
	"github.com/pomerium/pomerium/cache"
	"github.com/pomerium/pomerium/config"
	"github.com/pomerium/pomerium/internal/autocert"
	"github.com/pomerium/pomerium/internal/controlplane"
	"github.com/pomerium/pomerium/internal/databroker"
	"github.com/pomerium/pomerium/internal/envoy"
	"github.com/pomerium/pomerium/internal/log"
	"github.com/pomerium/pomerium/internal/urlutil"
	"github.com/pomerium/pomerium/internal/version"
	"github.com/pomerium/pomerium/proxy"
)

// Run runs the main pomerium application.
func Run(ctx context.Context, configFile string) error {
	log.Info().Str("version", version.FullVersion()).Msg("cmd/pomerium")

	var src config.Source

	src, err := config.NewFileOrEnvironmentSource(configFile)
	if err != nil {
		return err
	}

	src, err = autocert.New(src)
	if err != nil {
		return err
	}

	src = databroker.NewConfigSource(src)

	logMgr := config.NewLogManager(src)
	defer logMgr.Close()
	metricsMgr := config.NewMetricsManager(src)
	defer metricsMgr.Close()
	traceMgr := config.NewTraceManager(src)
	defer traceMgr.Close()

	cfg := src.GetConfig()

	// setup the control plane
	controlPlane, err := controlplane.NewServer(cfg.Options.Services)
	if err != nil {
		return fmt.Errorf("error creating control plane: %w", err)
	}
	src.OnConfigChange(controlPlane.OnConfigChange)
	controlPlane.OnConfigChange(cfg)

	_, grpcPort, _ := net.SplitHostPort(controlPlane.GRPCListener.Addr().String())
	_, httpPort, _ := net.SplitHostPort(controlPlane.HTTPListener.Addr().String())

	log.Info().Str("port", grpcPort).Msg("gRPC server started")
	log.Info().Str("port", httpPort).Msg("HTTP server started")

	// create envoy server
	envoyServer, err := envoy.NewServer(src, grpcPort, httpPort)
	if err != nil {
		return fmt.Errorf("error creating envoy server: %w", err)
	}
	defer envoyServer.Close()

	// add services
	if err := setupAuthenticate(src, cfg, controlPlane); err != nil {
		return err
	}
	var authorizeServer *authorize.Authorize
	if config.IsAuthorize(cfg.Options.Services) {
		authorizeServer, err = setupAuthorize(src, cfg, controlPlane)
		if err != nil {
			return err
		}
	}
	var cacheServer *cache.Cache
	if config.IsCache(cfg.Options.Services) {
		cacheServer, err = setupCache(cfg.Options, controlPlane)
		if err != nil {
			return err
		}
	}
	if err := setupProxy(src, cfg, controlPlane); err != nil {
		return err
	}

	ctx, cancel := context.WithCancel(ctx)
	go func(ctx context.Context) {
		ch := make(chan os.Signal, 2)
		defer signal.Stop(ch)

		signal.Notify(ch, os.Interrupt)
		signal.Notify(ch, syscall.SIGTERM)

		select {
		case <-ch:
		case <-ctx.Done():
		}
		cancel()
	}(ctx)

	// run everything
	eg, ctx := errgroup.WithContext(ctx)
	eg.Go(func() error {
		return controlPlane.Run(ctx)
	})
	if authorizeServer != nil {
		eg.Go(func() error {
			return authorizeServer.Run(ctx)
		})
	}
	if cacheServer != nil {
		eg.Go(func() error {
			return cacheServer.Run(ctx)
		})
	}
	return eg.Wait()
}

func setupAuthenticate(src config.Source, cfg *config.Config, controlPlane *controlplane.Server) error {
	if !config.IsAuthenticate(cfg.Options.Services) {
		return nil
	}

	svc, err := authenticate.New(cfg)
	if err != nil {
		return fmt.Errorf("error creating authenticate service: %w", err)
	}
	src.OnConfigChange(svc.OnConfigChange)
	svc.OnConfigChange(cfg)
	host := urlutil.StripPort(cfg.Options.GetAuthenticateURL().Host)
	sr := controlPlane.HTTPRouter.Host(host).Subrouter()
	svc.Mount(sr)
	log.Info().Str("host", host).Msg("enabled authenticate service")

	return nil
}

func setupAuthorize(src config.Source, cfg *config.Config, controlPlane *controlplane.Server) (*authorize.Authorize, error) {
	svc, err := authorize.New(cfg)
	if err != nil {
		return nil, fmt.Errorf("error creating authorize service: %w", err)
	}
	envoy_service_auth_v2.RegisterAuthorizationServer(controlPlane.GRPCServer, svc)

	log.Info().Msg("enabled authorize service")
	src.OnConfigChange(svc.OnConfigChange)
	svc.OnConfigChange(cfg)
	return svc, nil
}

func setupCache(opt *config.Options, controlPlane *controlplane.Server) (*cache.Cache, error) {
	svc, err := cache.New(*opt)
	if err != nil {
		return nil, fmt.Errorf("error creating config service: %w", err)
	}
	svc.Register(controlPlane.GRPCServer)
	log.Info().Msg("enabled cache service")
	return svc, nil
}

func setupProxy(src config.Source, cfg *config.Config, controlPlane *controlplane.Server) error {
	if !config.IsProxy(cfg.Options.Services) {
		return nil
	}

	svc, err := proxy.New(cfg)
	if err != nil {
		return fmt.Errorf("error creating proxy service: %w", err)
	}
	controlPlane.HTTPRouter.PathPrefix("/").Handler(svc)

	log.Info().Msg("enabled proxy service")
	src.OnConfigChange(svc.OnConfigChange)
	svc.OnConfigChange(cfg)

	return nil
}