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main.go
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// Copyright 2025 clavinjune/serve
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package main is the main package where serve is implemented
// Usage of serve:
//
// -p int
// port on which the server will listen (default 1313)
// -q run server quietly
// -r string
// root document which the server will serve (default ".")
// -s serve single page application
// -v print current version
package main
import (
"context"
"flag"
"fmt"
"log/slog"
"net"
"net/http"
"os"
"os/signal"
"path/filepath"
"runtime"
"strings"
"syscall"
"time"
"github.com/clavinjune/serve/internal"
)
var (
defaultReadTimeout = time.Minute
portFlag *int
quietFlag *bool
rootFlag *string
spaFlag *bool
versionFlag *bool
version = "dev"
builtBy = "dev"
commit = "n/a"
date = "0001-01-01 00:00:00 +0000 UTC"
)
func init() {
portFlag = flag.Int("p", 1313, "port on which the server will listen")
quietFlag = flag.Bool("q", false, "run server quietly")
rootFlag = flag.String("r", ".", "root document which the server will serve")
spaFlag = flag.Bool("s", false, "serve single page application")
versionFlag = flag.Bool("v", false, "print current version")
flag.Parse()
}
func mustGetRootDirectory(dir string) string {
root, err := filepath.Abs(strings.TrimRight(dir, "/"))
if err != nil {
slog.LogAttrs(context.TODO(), slog.LevelError, err.Error())
os.Exit(1)
}
if _, err := os.Stat(root); err != nil {
slog.LogAttrs(context.TODO(), slog.LevelError, err.Error())
os.Exit(1)
}
return root
}
func mustGetListener(port int) net.Listener {
addr := fmt.Sprintf(":%d", port)
l, err := net.Listen("tcp", addr)
if err != nil {
slog.LogAttrs(context.TODO(), slog.LevelError, err.Error())
os.Exit(1)
}
return l
}
func mustGetServer(rootDir string, isSpa bool) *http.Server {
return &http.Server{
Handler: internal.Handle(rootDir, isSpa),
ReadTimeout: defaultReadTimeout,
}
}
func main() {
ctx := context.TODO()
if *versionFlag {
fmt.Printf("serve %s-%s %s/%s BuildBy=%s BuildDate=%s",
version, commit,
runtime.GOOS, runtime.GOARCH,
builtBy, date)
return
}
level := slog.LevelInfo
if *quietFlag {
level = slog.LevelError
}
slog.SetDefault(slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
AddSource: true,
Level: level,
})))
rootDir := mustGetRootDirectory(*rootFlag)
listener := mustGetListener(*portFlag)
server := mustGetServer(rootDir, *spaFlag)
go func() {
slog.LogAttrs(ctx, slog.LevelInfo,
"listen and serve",
slog.String("root", rootDir),
slog.Int("port", *portFlag),
)
if err := server.Serve(listener); err != nil && err != http.ErrServerClosed {
slog.LogAttrs(ctx, slog.LevelError, err.Error())
os.Exit(1)
}
slog.LogAttrs(ctx, slog.LevelInfo, "shutdown gracefully")
}()
stopSignal := make(chan os.Signal, 1)
signal.Notify(stopSignal, os.Interrupt, syscall.SIGTERM, syscall.SIGINT)
<-stopSignal
ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
defer cancel()
if err := server.Shutdown(ctx); err != nil {
slog.LogAttrs(ctx, slog.LevelError, err.Error())
os.Exit(1)
}
}