Add support for tableflip

cmd/violet/serve.go

@@ -18,35 +18,53 @@ import (
 	"github.com/1f349/violet/servers/api"
 	"github.com/1f349/violet/servers/conf"
 	"github.com/1f349/violet/utils"
+	"github.com/charmbracelet/log"
+	"github.com/cloudflare/tableflip"
 	"github.com/google/subcommands"
-	"github.com/mrmelon54/exit-reload"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/collectors"
 	"io/fs"
 	"net/http"
 	"os"
+	"os/signal"
 	"path/filepath"
+	"syscall"
+	"time"
 )
 
 type serveCmd struct {
 	configPath string
-	cpuprofile string
+	debugLog   bool
+	pidFile    string
 }
 
 func (s *serveCmd) Name() string     { return "serve" }
 func (s *serveCmd) Synopsis() string { return "Serve reverse proxy server" }
 func (s *serveCmd) SetFlags(f *flag.FlagSet) {
 	f.StringVar(&s.configPath, "conf", "", "/path/to/config.json : path to the config file")
+	f.BoolVar(&s.debugLog, "debug", false, "enable debug logging")
+	f.StringVar(&s.pidFile, "pid-file", "", "path to pid file")
 }
 func (s *serveCmd) Usage() string {
-	return `serve [-conf <config file>]
+	return `serve [-conf <config file>] [-debug] [-pid-file <pid file>]
   Serve reverse proxy server using information from config file
 `
 }
 
 func (s *serveCmd) Execute(_ context.Context, _ *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
+	if s.debugLog {
+		logger.Logger.SetLevel(log.DebugLevel)
+	}
 	logger.Logger.Info("Starting...")
 
+	upg, err := tableflip.New(tableflip.Options{
+		PIDFile: s.pidFile,
+	})
+	if err != nil {
+		panic(err)
+	}
+	defer upg.Stop()
+
 	if s.configPath == "" {
 		logger.Logger.Info("Error: config flag is missing")
 		return subcommands.ExitUsageError
@@ -71,13 +89,9 @@ func (s *serveCmd) Execute(_ context.Context, _ *flag.FlagSet, _ ...interface{})
 
 	// working directory is the parent of the config file
 	wd := filepath.Dir(s.configPath)
-	normalLoad(config, wd)
-	return subcommands.ExitSuccess
-}
 
-func normalLoad(startUp startUpConfig, wd string) {
 	// the cert and key paths are useless in self-signed mode
-	if !startUp.SelfSigned {
+	if !config.SelfSigned {
 		// create path to cert dir
 		err := os.MkdirAll(filepath.Join(wd, "certs"), os.ModePerm)
 		if err != nil {
@@ -92,11 +106,11 @@ func normalLoad(startUp startUpConfig, wd string) {
 
 	// errorPageDir stores an FS interface for accessing the error page directory
 	var errorPageDir fs.FS
-	if startUp.ErrorPagePath != "" {
+	if config.ErrorPagePath != "" {
-		errorPageDir = os.DirFS(startUp.ErrorPagePath)
+		errorPageDir = os.DirFS(config.ErrorPagePath)
-		err := os.MkdirAll(startUp.ErrorPagePath, os.ModePerm)
+		err := os.MkdirAll(config.ErrorPagePath, os.ModePerm)
 		if err != nil {
-			logger.Logger.Fatal("Failed to create error page", "path", startUp.ErrorPagePath)
+			logger.Logger.Fatal("Failed to create error page", "path", config.ErrorPagePath)
 		}
 	}
 
@@ -125,18 +139,15 @@ func normalLoad(startUp startUpConfig, wd string) {
 	ws := websocket.NewServer()
 	allowedDomains := domains.New(db)                             // load allowed domains
 	acmeChallenges := utils.NewAcmeChallenge()                    // load acme challenge store
-	allowedCerts := certs.New(certDir, keyDir, startUp.SelfSigned) // load certificate manager
+	allowedCerts := certs.New(certDir, keyDir, config.SelfSigned) // load certificate manager
 	hybridTransport := proxy.NewHybridTransport(ws)               // load reverse proxy
-	dynamicFavicons := favicons.New(db, startUp.InkscapeCmd)       // load dynamic favicon provider
+	dynamicFavicons := favicons.New(db, config.InkscapeCmd)       // load dynamic favicon provider
 	dynamicErrorPages := errorPages.New(errorPageDir)             // load dynamic error page provider
 	dynamicRouter := router.NewManager(db, hybridTransport)       // load dynamic router manager
 
 	// struct containing config for the http servers
 	srvConf := &conf.Conf{
-		ApiListen:   startUp.Listen.Api,
+		RateLimit:  config.RateLimit,
-		HttpListen:  startUp.Listen.Http,
-		HttpsListen: startUp.Listen.Https,
-		RateLimit:   startUp.RateLimit,
 		DB:         db,
 		Domains:    allowedDomains,
 		Acme:       acmeChallenges,
@@ -151,32 +162,72 @@ func normalLoad(startUp startUpConfig, wd string) {
 	allCompilables := utils.MultiCompilable{allowedDomains, allowedCerts, dynamicFavicons, dynamicErrorPages, dynamicRouter}
 	allCompilables.Compile()
 
+	_, httpsPort, ok := utils.SplitDomainPort(config.Listen.Https, 443)
+	if !ok {
+		httpsPort = 443
+	}
+
 	var srvApi, srvHttp, srvHttps *http.Server
-	if srvConf.ApiListen != "" {
+	if config.Listen.Api != "" {
+		// Listen must be called before Ready
+		lnApi, err := upg.Listen("tcp", config.Listen.Api)
+		if err != nil {
+			logger.Logger.Fatal("Listen failed", "err", err)
+		}
 		srvApi = api.NewApiServer(srvConf, allCompilables, promRegistry)
 		srvApi.SetKeepAlivesEnabled(false)
 		l := logger.Logger.With("server", "API")
 		l.Info("Starting server", "addr", srvApi.Addr)
-		go utils.RunBackgroundHttp(l, srvApi)
+		go utils.RunBackgroundHttp(l, srvApi, lnApi)
 	}
-	if srvConf.HttpListen != "" {
+	if config.Listen.Http != "" {
-		srvHttp = servers.NewHttpServer(srvConf, promRegistry)
+		// Listen must be called before Ready
+		lnHttp, err := upg.Listen("tcp", config.Listen.Http)
+		if err != nil {
+			logger.Logger.Fatal("Listen failed", "err", err)
+		}
+		srvHttp = servers.NewHttpServer(uint16(httpsPort), srvConf, promRegistry)
 		srvHttp.SetKeepAlivesEnabled(false)
 		l := logger.Logger.With("server", "HTTP")
 		l.Info("Starting server", "addr", srvHttp.Addr)
-		go utils.RunBackgroundHttp(l, srvHttp)
+		go utils.RunBackgroundHttp(l, srvHttp, lnHttp)
+	}
+	if config.Listen.Https != "" {
+		// Listen must be called before Ready
+		lnHttps, err := upg.Listen("tcp", config.Listen.Https)
+		if err != nil {
+			logger.Logger.Fatal("Listen failed", "err", err)
 		}
-	if srvConf.HttpsListen != "" {
 		srvHttps = servers.NewHttpsServer(srvConf, promRegistry)
 		srvHttps.SetKeepAlivesEnabled(false)
 		l := logger.Logger.With("server", "HTTPS")
 		l.Info("Starting server", "addr", srvHttps.Addr)
-		go utils.RunBackgroundHttps(l, srvHttps)
+		go utils.RunBackgroundHttps(l, srvHttps, lnHttps)
 	}
 
-	exit_reload.ExitReload("Violet", func() {
+	// Do an upgrade on SIGHUP
-		allCompilables.Compile()
+	go func() {
-	}, func() {
+		sig := make(chan os.Signal, 1)
+		signal.Notify(sig, syscall.SIGHUP)
+		for range sig {
+			err := upg.Upgrade()
+			if err != nil {
+				logger.Logger.Error("Failed upgrade", "err", err)
+			}
+		}
+	}()
+
+	logger.Logger.Info("Ready")
+	if err := upg.Ready(); err != nil {
+		panic(err)
+	}
+	<-upg.Exit()
+
+	time.AfterFunc(30*time.Second, func() {
+		logger.Logger.Warn("Graceful shutdown timed out")
+		os.Exit(1)
+	})
+
 	// stop updating certificates
 	allowedCerts.Stop()
 
@@ -193,5 +244,6 @@ func normalLoad(startUp startUpConfig, wd string) {
 	if srvHttps != nil {
 		_ = srvHttps.Close()
 	}
-	})
+
+	return subcommands.ExitSuccess
 }

go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/1f349/mjwt v0.2.5
 	github.com/AlecAivazis/survey/v2 v2.3.7
 	github.com/charmbracelet/log v0.4.0
+	github.com/cloudflare/tableflip v1.2.3
 	github.com/golang-migrate/migrate/v4 v4.17.1
 	github.com/google/subcommands v1.2.0
 	github.com/google/uuid v1.6.0
@@ -13,7 +14,6 @@ require (
 	github.com/julienschmidt/httprouter v1.3.0
 	github.com/mattn/go-sqlite3 v1.14.22
 	github.com/mrmelon54/certgen v0.0.2
-	github.com/mrmelon54/exit-reload v0.0.2
 	github.com/mrmelon54/png2ico v1.0.2
 	github.com/mrmelon54/rescheduler v0.0.3
 	github.com/mrmelon54/trie v0.0.3

go.sum

@@ -16,6 +16,8 @@ github.com/charmbracelet/lipgloss v0.10.0 h1:KWeXFSexGcfahHX+54URiZGkBFazf70JNMt
 github.com/charmbracelet/lipgloss v0.10.0/go.mod h1:Wig9DSfvANsxqkRsqj6x87irdy123SR4dOXlKa91ciE=
 github.com/charmbracelet/log v0.4.0 h1:G9bQAcx8rWA2T3pWvx7YtPTPwgqpk7D68BX21IRW8ZM=
 github.com/charmbracelet/log v0.4.0/go.mod h1:63bXt/djrizTec0l11H20t8FDSvA4CRZJ1KH22MdptM=
+github.com/cloudflare/tableflip v1.2.3 h1:8I+B99QnnEWPHOY3fWipwVKxS70LGgUsslG7CSfmHMw=
+github.com/cloudflare/tableflip v1.2.3/go.mod h1:P4gRehmV6Z2bY5ao5ml9Pd8u6kuEnlB37pUFMmv7j2E=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/creack/pty v1.1.17 h1:QeVUsEDNrLBW4tMgZHvxy18sKtr6VI492kBhUfhDJNI=
 github.com/creack/pty v1.1.17/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=
@@ -72,8 +74,6 @@ github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d h1:5PJl274Y63IEHC+7izoQ
 github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d/go.mod h1:01TrycV0kFyexm33Z7vhZRXopbI8J3TDReVlkTgMUxE=
 github.com/mrmelon54/certgen v0.0.2 h1:4CMDkA/gGZu+E4iikU+5qdOWK7qOQrk58KtUfnmyYmY=
 github.com/mrmelon54/certgen v0.0.2/go.mod h1:vwrWSXQmxZYqEyh+cf05IvDIFV2aYuxL4+O6ABIlN8M=
-github.com/mrmelon54/exit-reload v0.0.2 h1:vqgfrMD/bF21HkDsWgg5+NLjFDrD3KGVEN/iTrMn9Ms=
-github.com/mrmelon54/exit-reload v0.0.2/go.mod h1:aE3NhsqGMLUqmv6cJZRouC/8gXkZTvVSabRGOpI+Vjc=
 github.com/mrmelon54/png2ico v1.0.2 h1:KyJd3ATmDjxAJS28MTSf44GxzYnlZ+7KT8SXzGb3sN8=
 github.com/mrmelon54/png2ico v1.0.2/go.mod h1:vp8Be9y5cz102ANon+BnsIzTUdet3VQRvOuWJTH9h0M=
 github.com/mrmelon54/rescheduler v0.0.3 h1:TrkJL6S7PKvXuo1mvdgRgsILA/pk5L1lrXhV/q7IEzQ=
@@ -130,6 +130,7 @@ golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

servers/api/api.go

@@ -48,7 +48,6 @@ func NewApiServer(conf *conf.Conf, compileTarget utils.MultiCompilable, registry
 
 	// Create and run http server
 	return &http.Server{
-		Addr:              conf.ApiListen,
 		Handler:           r,
 		ReadTimeout:       time.Minute,
 		ReadHeaderTimeout: time.Minute,

servers/conf/conf.go

@@ -11,9 +11,6 @@ import (
 
 // Conf stores the shared configuration for the API, HTTP and HTTPS servers.
 type Conf struct {
-	ApiListen   string // api server listen address
-	HttpListen  string // http server listen address
-	HttpsListen string // https server listen address
 	RateLimit  uint64 // rate limit per minute
 	DB         *database.Queries
 	Domains    utils.DomainProvider

servers/http.go

@@ -17,13 +17,9 @@ import (
 //
 // `/.well-known/acme-challenge/{token}` is used for outputting answers for
 // acme challenges, this is used for Let's Encrypt HTTP verification.
-func NewHttpServer(conf *conf.Conf, registry *prometheus.Registry) *http.Server {
+func NewHttpServer(httpsPort uint16, conf *conf.Conf, registry *prometheus.Registry) *http.Server {
 	r := httprouter.New()
 	var secureExtend string
-	_, httpsPort, ok := utils.SplitDomainPort(conf.HttpsListen, 443)
-	if !ok {
-		httpsPort = 443
-	}
 	if httpsPort != 443 {
 		secureExtend = fmt.Sprintf(":%d", httpsPort)
 	}
@@ -72,7 +68,6 @@ func NewHttpServer(conf *conf.Conf, registry *prometheus.Registry) *http.Server
 
 	// Create and run http server
 	return &http.Server{
-		Addr:              conf.HttpListen,
 		Handler:           metricsMiddleware,
 		ReadTimeout:       time.Minute,
 		ReadHeaderTimeout: time.Minute,

servers/http_test.go

@@ -18,7 +18,7 @@ func TestNewHttpServer_AcmeChallenge(t *testing.T) {
 		Acme:    utils.NewAcmeChallenge(),
 		Signer:  fake.SnakeOilProv,
 	}
-	srv := NewHttpServer(httpConf, nil)
+	srv := NewHttpServer(443, httpConf, nil)
 	httpConf.Acme.Put("example.com", "456", "456def")
 
 	req, err := http.NewRequest(http.MethodGet, "https://example.com/.well-known/acme-challenge/456", nil)

servers/https.go

@@ -42,7 +42,6 @@ func NewHttpsServer(conf *conf.Conf, registry *prometheus.Registry) *http.Server
 	})
 
 	return &http.Server{
-		Addr:    conf.HttpsListen,
 		Handler: hsts,
 		TLSConfig: &tls.Config{
 			// Suggested by https://ssl-config.mozilla.org/#server=go&version=1.21.5&config=intermediate

utils/server-utils.go

@@ -3,6 +3,7 @@ package utils
 import (
 	"errors"
 	"github.com/charmbracelet/log"
+	"net"
 	"net/http"
 	"strings"
 )
@@ -21,14 +22,14 @@ func logHttpServerError(logger *log.Logger, err error) {
 
 // RunBackgroundHttp runs a http server and logs when the server closes or
 // errors.
-func RunBackgroundHttp(logger *log.Logger, s *http.Server) {
+func RunBackgroundHttp(logger *log.Logger, s *http.Server, ln net.Listener) {
-	logHttpServerError(logger, s.ListenAndServe())
+	logHttpServerError(logger, s.Serve(ln))
 }
 
 // RunBackgroundHttps runs a http server with TLS encryption and logs when the
 // server closes or errors.
-func RunBackgroundHttps(logger *log.Logger, s *http.Server) {
+func RunBackgroundHttps(logger *log.Logger, s *http.Server, ln net.Listener) {
-	logHttpServerError(logger, s.ListenAndServeTLS("", ""))
+	logHttpServerError(logger, s.ServeTLS(ln, "", ""))
 }
 
 // GetBearer returns the bearer from the Authorization header or an empty string