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listen.go
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listen.go
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// ⚡️ Fiber is an Express inspired web framework written in Go with ☕️
// 🤖 Github Repository: https://github.com/gofiber/fiber
// 📌 API Documentation: https://docs.gofiber.io
package fiber
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"net"
"os"
"path/filepath"
"reflect"
"runtime"
"sort"
"strconv"
"strings"
"text/tabwriter"
"github.com/mattn/go-colorable"
"github.com/mattn/go-isatty"
"github.com/mattn/go-runewidth"
)
// Listener can be used to pass a custom listener.
func (app *App) Listener(ln net.Listener) error {
// prepare the server for the start
app.startupProcess()
// Print startup message
if !app.config.DisableStartupMessage {
app.startupMessage(ln.Addr().String(), getTlsConfig(ln) != nil, "")
}
// Print routes
if app.config.EnablePrintRoutes {
app.printRoutesMessage()
}
// Prefork is not supported for custom listeners
if app.config.Prefork {
fmt.Println("[Warning] Prefork isn't supported for custom listeners.")
}
// Start listening
return app.server.Serve(ln)
}
// Listen serves HTTP requests from the given addr.
//
// app.Listen(":8080")
// app.Listen("127.0.0.1:8080")
func (app *App) Listen(addr string) error {
// Start prefork
if app.config.Prefork {
return app.prefork(app.config.Network, addr, nil)
}
// Setup listener
ln, err := net.Listen(app.config.Network, addr)
if err != nil {
return err
}
// prepare the server for the start
app.startupProcess()
// Print startup message
if !app.config.DisableStartupMessage {
app.startupMessage(ln.Addr().String(), false, "")
}
// Print routes
if app.config.EnablePrintRoutes {
app.printRoutesMessage()
}
// Start listening
return app.server.Serve(ln)
}
// ListenTLS serves HTTPS requests from the given addr.
// certFile and keyFile are the paths to TLS certificate and key file:
//
// app.ListenTLS(":8080", "./cert.pem", "./cert.key")
func (app *App) ListenTLS(addr, certFile, keyFile string) error {
// Check for valid cert/key path
if len(certFile) == 0 || len(keyFile) == 0 {
return errors.New("tls: provide a valid cert or key path")
}
// Set TLS config with handler
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
return fmt.Errorf("tls: cannot load TLS key pair from certFile=%q and keyFile=%q: %s", certFile, keyFile, err)
}
tlsHandler := &TLSHandler{}
config := &tls.Config{
MinVersion: tls.VersionTLS12,
Certificates: []tls.Certificate{
cert,
},
GetCertificate: tlsHandler.GetClientInfo,
}
// Prefork is supported
if app.config.Prefork {
return app.prefork(app.config.Network, addr, config)
}
// Setup listener
ln, err := net.Listen(app.config.Network, addr)
ln = tls.NewListener(ln, config)
if err != nil {
return err
}
// prepare the server for the start
app.startupProcess()
// Print startup message
if !app.config.DisableStartupMessage {
app.startupMessage(ln.Addr().String(), true, "")
}
// Print routes
if app.config.EnablePrintRoutes {
app.printRoutesMessage()
}
// Attach the tlsHandler to the config
app.SetTLSHandler(tlsHandler)
// Start listening
return app.server.Serve(ln)
}
// ListenMutualTLS serves HTTPS requests from the given addr.
// certFile, keyFile and clientCertFile are the paths to TLS certificate and key file:
//
// app.ListenMutualTLS(":8080", "./cert.pem", "./cert.key", "./client.pem")
func (app *App) ListenMutualTLS(addr, certFile, keyFile, clientCertFile string) error {
// Check for valid cert/key path
if len(certFile) == 0 || len(keyFile) == 0 {
return errors.New("tls: provide a valid cert or key path")
}
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
return fmt.Errorf("tls: cannot load TLS key pair from certFile=%q and keyFile=%q: %s", certFile, keyFile, err)
}
clientCACert, err := os.ReadFile(filepath.Clean(clientCertFile))
if err != nil {
return err
}
clientCertPool := x509.NewCertPool()
clientCertPool.AppendCertsFromPEM(clientCACert)
tlsHandler := &TLSHandler{}
config := &tls.Config{
MinVersion: tls.VersionTLS12,
ClientAuth: tls.RequireAndVerifyClientCert,
ClientCAs: clientCertPool,
Certificates: []tls.Certificate{
cert,
},
GetCertificate: tlsHandler.GetClientInfo,
}
// Prefork is supported
if app.config.Prefork {
return app.prefork(app.config.Network, addr, config)
}
// Setup listener
ln, err := tls.Listen(app.config.Network, addr, config)
if err != nil {
return err
}
// prepare the server for the start
app.startupProcess()
// Print startup message
if !app.config.DisableStartupMessage {
app.startupMessage(ln.Addr().String(), true, "")
}
// Print routes
if app.config.EnablePrintRoutes {
app.printRoutesMessage()
}
// Attach the tlsHandler to the config
app.SetTLSHandler(tlsHandler)
// Start listening
return app.server.Serve(ln)
}
// startupMessage prepares the startup message with the handler number, port, address and other information
func (app *App) startupMessage(addr string, tls bool, pids string) {
// ignore child processes
if IsChild() {
return
}
// Alias colors
colors := app.config.ColorScheme
value := func(s string, width int) string {
pad := width - len(s)
str := ""
for i := 0; i < pad; i++ {
str += "."
}
if s == "Disabled" {
str += " " + s
} else {
str += fmt.Sprintf(" %s%s%s", colors.Cyan, s, colors.Black)
}
return str
}
center := func(s string, width int) string {
pad := strconv.Itoa((width - len(s)) / 2)
str := fmt.Sprintf("%"+pad+"s", " ")
str += s
str += fmt.Sprintf("%"+pad+"s", " ")
if len(str) < width {
str += " "
}
return str
}
centerValue := func(s string, width int) string {
pad := strconv.Itoa((width - runewidth.StringWidth(s)) / 2)
str := fmt.Sprintf("%"+pad+"s", " ")
str += fmt.Sprintf("%s%s%s", colors.Cyan, s, colors.Black)
str += fmt.Sprintf("%"+pad+"s", " ")
if runewidth.StringWidth(s)-10 < width && runewidth.StringWidth(s)%2 == 0 {
// add an ending space if the length of str is even and str is not too long
str += " "
}
return str
}
pad := func(s string, width int) (str string) {
toAdd := width - len(s)
str += s
for i := 0; i < toAdd; i++ {
str += " "
}
return
}
host, port := parseAddr(addr)
if host == "" {
if app.config.Network == NetworkTCP6 {
host = "[::1]"
} else {
host = "0.0.0.0"
}
}
scheme := "http"
if tls {
scheme = "https"
}
isPrefork := "Disabled"
if app.config.Prefork {
isPrefork = "Enabled"
}
procs := strconv.Itoa(runtime.GOMAXPROCS(0))
if !app.config.Prefork {
procs = "1"
}
mainLogo := colors.Black + " ┌───────────────────────────────────────────────────┐\n"
if app.config.AppName != "" {
mainLogo += " │ " + centerValue(app.config.AppName, 49) + " │\n"
}
mainLogo += " │ " + centerValue("Fiber v"+Version, 49) + " │\n"
if host == "0.0.0.0" {
mainLogo +=
" │ " + center(fmt.Sprintf("%s://127.0.0.1:%s", scheme, port), 49) + " │\n" +
" │ " + center(fmt.Sprintf("(bound on host 0.0.0.0 and port %s)", port), 49) + " │\n"
} else {
mainLogo +=
" │ " + center(fmt.Sprintf("%s://%s:%s", scheme, host, port), 49) + " │\n"
}
mainLogo += fmt.Sprintf(
" │ │\n"+
" │ Handlers %s Processes %s │\n"+
" │ Prefork .%s PID ....%s │\n"+
" └───────────────────────────────────────────────────┘"+
colors.Reset,
value(strconv.Itoa(int(app.handlersCount)), 14), value(procs, 12),
value(isPrefork, 14), value(strconv.Itoa(os.Getpid()), 14),
)
var childPidsLogo string
if app.config.Prefork {
var childPidsTemplate string
childPidsTemplate += "%s"
childPidsTemplate += " ┌───────────────────────────────────────────────────┐\n%s"
childPidsTemplate += " └───────────────────────────────────────────────────┘"
childPidsTemplate += "%s"
newLine := " │ %s%s%s │"
// Turn the `pids` variable (in the form ",a,b,c,d,e,f,etc") into a slice of PIDs
var pidSlice []string
for _, v := range strings.Split(pids, ",") {
if v != "" {
pidSlice = append(pidSlice, v)
}
}
var lines []string
thisLine := "Child PIDs ... "
var itemsOnThisLine []string
addLine := func() {
lines = append(lines,
fmt.Sprintf(
newLine,
colors.Black,
thisLine+colors.Cyan+pad(strings.Join(itemsOnThisLine, ", "), 49-len(thisLine)),
colors.Black,
),
)
}
for _, pid := range pidSlice {
if len(thisLine+strings.Join(append(itemsOnThisLine, pid), ", ")) > 49 {
addLine()
thisLine = ""
itemsOnThisLine = []string{pid}
} else {
itemsOnThisLine = append(itemsOnThisLine, pid)
}
}
// Add left over items to their own line
if len(itemsOnThisLine) != 0 {
addLine()
}
// Form logo
childPidsLogo = fmt.Sprintf(childPidsTemplate,
colors.Black,
strings.Join(lines, "\n")+"\n",
colors.Reset,
)
}
// Combine both the child PID logo and the main Fiber logo
// Pad the shorter logo to the length of the longer one
splitMainLogo := strings.Split(mainLogo, "\n")
splitChildPidsLogo := strings.Split(childPidsLogo, "\n")
mainLen := len(splitMainLogo)
childLen := len(splitChildPidsLogo)
if mainLen > childLen {
diff := mainLen - childLen
for i := 0; i < diff; i++ {
splitChildPidsLogo = append(splitChildPidsLogo, "")
}
} else {
diff := childLen - mainLen
for i := 0; i < diff; i++ {
splitMainLogo = append(splitMainLogo, "")
}
}
// Combine the two logos, line by line
output := "\n"
for i := range splitMainLogo {
output += colors.Black + splitMainLogo[i] + " " + splitChildPidsLogo[i] + "\n"
}
out := colorable.NewColorableStdout()
if os.Getenv("TERM") == "dumb" || os.Getenv("NO_COLOR") == "1" || (!isatty.IsTerminal(os.Stdout.Fd()) && !isatty.IsCygwinTerminal(os.Stdout.Fd())) {
out = colorable.NewNonColorable(os.Stdout)
}
_, _ = fmt.Fprintln(out, output)
}
// printRoutesMessage print all routes with method, path, name and handlers
// in a format of table, like this:
// method | path | name | handlers
// GET | / | routeName | github.com/gofiber/fiber/v2.emptyHandler
// HEAD | / | | github.com/gofiber/fiber/v2.emptyHandler
func (app *App) printRoutesMessage() {
// ignore child processes
if IsChild() {
return
}
// Alias colors
colors := app.config.ColorScheme
var routes []RouteMessage
for _, routeStack := range app.stack {
for _, route := range routeStack {
var newRoute = RouteMessage{}
newRoute.name = route.Name
newRoute.method = route.Method
newRoute.path = route.Path
for _, handler := range route.Handlers {
newRoute.handlers += runtime.FuncForPC(reflect.ValueOf(handler).Pointer()).Name() + " "
}
routes = append(routes, newRoute)
}
}
out := colorable.NewColorableStdout()
if os.Getenv("TERM") == "dumb" || os.Getenv("NO_COLOR") == "1" || (!isatty.IsTerminal(os.Stdout.Fd()) && !isatty.IsCygwinTerminal(os.Stdout.Fd())) {
out = colorable.NewNonColorable(os.Stdout)
}
w := tabwriter.NewWriter(out, 1, 1, 1, ' ', 0)
// Sort routes by path
sort.Slice(routes, func(i, j int) bool {
return routes[i].path < routes[j].path
})
_, _ = fmt.Fprintf(w, "%smethod\t%s| %spath\t%s| %sname\t%s| %shandlers\n", colors.Blue, colors.White, colors.Green, colors.White, colors.Cyan, colors.White, colors.Yellow)
_, _ = fmt.Fprintf(w, "%s------\t%s| %s----\t%s| %s----\t%s| %s--------\n", colors.Blue, colors.White, colors.Green, colors.White, colors.Cyan, colors.White, colors.Yellow)
for _, route := range routes {
_, _ = fmt.Fprintf(w, "%s%s\t%s| %s%s\t%s| %s%s\t%s| %s%s\n", colors.Blue, route.method, colors.White, colors.Green, route.path, colors.White, colors.Cyan, route.name, colors.White, colors.Yellow, route.handlers)
}
_ = w.Flush()
}