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fasthttpd.go
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fasthttpd.go
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package cmd
import (
"context"
"crypto/tls"
"flag"
"fmt"
"log"
"net"
"os"
"os/signal"
"path/filepath"
"strconv"
"strings"
"syscall"
"github.com/fasthttpd/fasthttpd/pkg/config"
"github.com/fasthttpd/fasthttpd/pkg/handler"
"github.com/fasthttpd/fasthttpd/pkg/logger"
fasthttpdnet "github.com/fasthttpd/fasthttpd/pkg/net"
"github.com/fasthttpd/fasthttpd/pkg/util"
"github.com/jarxorg/tree"
"github.com/valyala/fasthttp"
)
// EnvFasthttpdConfig is the environment variable name "FASTHTTPD_CONFIG" that
// indicates the default configuration file path.
const EnvFasthttpdConfig = "FASTHTTPD_CONFIG"
// version will update by github actions.
const version = "0.5.1"
const (
cmd = "fasthttpd"
desc = "FastHttpd is a lightweight http server using valyala/fasthttp."
usage = cmd + " [flags]"
examplesText = `Examples:
% fasthttpd -f ./examples/config.minimal.yaml
% fasthttpd -e root=./examples/public -e listen=:8080
`
)
func newMinimalConfig() config.Config {
return config.Config{
Host: "localhost",
Root: "./public",
Log: config.Log{Output: "stderr"},
Handlers: map[string]tree.Map{
"static": {
"type": tree.ToValue("fs"),
"indexNames": tree.ToArrayValues("index.html"),
},
},
Routes: []config.Route{{Handler: "static"}},
}.SetDefaults()
}
type FastHttpd struct {
flagSet *flag.FlagSet
isVersion bool
isHelp bool
configFile string
editExprs util.StringList
servers []*fasthttp.Server
stopHup context.CancelFunc
}
func NewFastHttpd() *FastHttpd {
return &FastHttpd{}
}
func (d *FastHttpd) initFlagSet(args []string) error {
s := flag.NewFlagSet(args[0], flag.ExitOnError)
d.flagSet = s
s.BoolVar(&d.isVersion, "v", false, "print version")
s.BoolVar(&d.isHelp, "h", false, "help for "+cmd)
s.StringVar(&d.configFile, "f", os.Getenv(EnvFasthttpdConfig), "configuration file")
s.Var(&d.editExprs, "e", "edit expression (eg. -e KEY=VALUE)")
s.Usage = func() {
fmt.Fprintf(os.Stderr, "%s\n\nUsage:\n %s\n\n", desc, usage)
fmt.Fprintln(os.Stderr, "Flags:")
s.PrintDefaults()
fmt.Fprintf(os.Stderr, "\n%s", examplesText)
}
return s.Parse(args[1:])
}
func (d *FastHttpd) loadConfigs() ([]config.Config, error) {
if d.configFile == "" {
return []config.Config{newMinimalConfig()}, nil
}
dir, file := filepath.Split(d.configFile)
if dir != "" {
if err := os.Chdir(dir); err != nil {
return nil, err
}
}
cfgs, err := config.UnmarshalYAMLPath(file)
if err != nil {
return nil, err
}
return cfgs, nil
}
func (d *FastHttpd) editConfigs(cfgs []config.Config) ([]config.Config, error) {
if len(d.editExprs) > 0 {
n, err := tree.MarshalViaYAML(cfgs)
if err != nil {
return nil, err
}
for _, expr := range d.editExprs {
lr := strings.SplitN(expr, "=", 2)
if len(lr) == 2 {
if !strings.HasPrefix(lr[0], ".") {
lr[0] = ".[]." + lr[0]
}
if !strings.HasPrefix(lr[1], `"`) &&
lr[1] != "true" && lr[1] != "false" && lr[1] != "null" {
if _, err := strconv.Atoi(lr[1]); err != nil {
lr[1] = strconv.Quote(lr[1])
}
}
expr = lr[0] + "=" + lr[1]
}
if err := tree.Edit(&n, expr); err != nil {
return nil, err
}
}
if err := tree.UnmarshalViaYAML(n, &cfgs); err != nil {
return nil, err
}
}
return cfgs, nil
}
func (d *FastHttpd) newServer(h handler.ServerHandler) (*fasthttp.Server, error) {
s := &fasthttp.Server{
Handler: h.Handle,
ErrorHandler: h.HandleError,
Logger: h.Logger(),
}
if err := tree.UnmarshalViaJSON(h.Config(), s); err != nil {
return nil, err
}
return s, nil
}
var netListen = func(listen string) (net.Listener, error) {
return net.Listen(fasthttpdnet.GetNetwork(listen), listen)
}
func (d *FastHttpd) listen(listen string, cfgs []config.Config, server *fasthttp.Server) (net.Listener, error) {
ln, err := netListen(listen)
if err != nil {
return nil, err
}
if tcpln, ok := ln.(*net.TCPListener); ok {
ln = &fasthttpdnet.TcpKeepaliveListener{
TCPListener: tcpln,
Keepalive: server.TCPKeepalive,
KeepalivePeriod: server.TCPKeepalivePeriod,
}
}
tlsCfg, err := fasthttpdnet.MultiTLSConfig(cfgs)
if err != nil {
return nil, err
}
if tlsCfg != nil {
ln = tls.NewListener(ln, tlsCfg)
}
return ln, nil
}
func (d *FastHttpd) run() error {
cfgs, err := d.loadConfigs()
if err != nil {
return err
}
cfgs, err = d.editConfigs(cfgs)
if err != nil {
return err
}
listenedCfgs := map[string][]config.Config{}
for _, cfg := range cfgs {
listenedCfgs[cfg.Listen] = append(listenedCfgs[cfg.Listen], cfg)
}
ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT)
defer stop()
go func() {
<-ctx.Done()
// log.Printf("signal int: shutdown fasthttpd")
if err := d.Shutdown(); err != nil {
log.Printf("failed to shutdown: %v", err)
}
}()
d.handleHUP()
errChs := make(chan error, 2)
for listen, cfgs := range listenedCfgs {
h, err := handler.NewServerHandler(cfgs)
if err != nil {
return err
}
defer h.Close()
server, err := d.newServer(h)
if err != nil {
return err
}
ln, err := d.listen(listen, cfgs, server)
if err != nil {
return err
}
h.Logger().Printf("starting fasthttpd on %q", listen)
d.servers = append(d.servers, server)
go func() {
err := server.Serve(ln)
errChs <- err
}()
}
var errs []string
for range listenedCfgs {
if err := <-errChs; err != nil {
errs = append(errs, err.Error())
}
}
if len(errs) > 0 {
return fmt.Errorf("failed to serve: %s", strings.Join(errs, "; "))
}
return nil
}
func (d *FastHttpd) handleHUP() {
ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGHUP)
d.stopHup = stop
go func() {
for {
<-ctx.Done()
if d.stopHup == nil {
break
}
// log.Printf("signal hup: rotate logs")
if err := logger.RotateShared(); err != nil {
log.Printf("failed to rotate stored: %v", err)
}
stop()
ctx, stop = signal.NotifyContext(context.Background(), syscall.SIGHUP)
d.stopHup = stop
}
}()
}
func (d *FastHttpd) Shutdown() error {
if stopHup := d.stopHup; stopHup != nil {
d.stopHup = nil
stopHup()
}
var errs []string
for _, server := range d.servers {
if err := server.Shutdown(); err != nil {
errs = append(errs, err.Error())
}
}
if len(errs) == 0 {
return nil
}
return fmt.Errorf(strings.Join(errs, "; "))
}
func (d *FastHttpd) Main(args []string) error {
if err := d.initFlagSet(args); err != nil {
return err
}
if d.isVersion {
fmt.Println(version)
return nil
}
if d.isHelp || (d.configFile == "" && len(d.editExprs) == 0) {
d.flagSet.Usage()
return nil
}
return d.run()
}
func RunFastHttpd(args []string) error {
return NewFastHttpd().Main(args)
}