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package main
import (
"context"
"embed"
"encoding/json"
"flag"
"fmt"
"github.com/jhalter/mobius/hotline"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"gopkg.in/natefinch/lumberjack.v2"
"io"
"log"
"net/http"
"os"
"path/filepath"
"runtime"
)
//go:embed mobius/config
var cfgTemplate embed.FS
const (
defaultPort = 5500
)
func main() {
ctx, cancel := context.WithCancel(context.Background())
// TODO: implement graceful shutdown by closing context
// c := make(chan os.Signal, 1)
// signal.Notify(c, os.Interrupt)
// defer func() {
// signal.Stop(c)
// cancel()
// }()
// go func() {
// select {
// case <-c:
// cancel()
// case <-ctx.Done():
// }
// }()
netInterface := flag.String("interface", "", "IP addr of interface to listen on. Defaults to all interfaces.")
basePort := flag.Int("bind", defaultPort, "Base Hotline server port. File transfer port is base port + 1.")
statsPort := flag.String("stats-port", "", "Enable stats HTTP endpoint on address and port")
configDir := flag.String("config", defaultConfigPath(), "Path to config root")
version := flag.Bool("version", false, "print version and exit")
logLevel := flag.String("log-level", "info", "Log level")
logFile := flag.String("log-file", "", "Path to log file")
init := flag.Bool("init", false, "Populate the config dir with default configuration")
flag.Parse()
if *version {
fmt.Printf("v%s\n", hotline.VERSION)
os.Exit(0)
}
zapLvl, ok := zapLogLevel[*logLevel]
if !ok {
fmt.Printf("Invalid log level %s. Must be debug, info, warn, or error.\n", *logLevel)
os.Exit(0)
}
cores := []zapcore.Core{
newStdoutCore(zapLvl),
}
if *logFile != "" {
cores = append(cores, newLogFileCore(*logFile, zapLvl))
}
l := zap.New(zapcore.NewTee(cores...))
defer func() { _ = l.Sync() }()
logger := l.Sugar()
if *init {
if _, err := os.Stat(filepath.Join(*configDir, "/config.yaml")); os.IsNotExist(err) {
if err := os.MkdirAll(*configDir, 0750); err != nil {
logger.Fatal(err)
}
if err := copyDir("mobius/config", *configDir); err != nil {
logger.Fatal(err)
}
logger.Infow("Config dir initialized at " + *configDir)
} else {
logger.Infow("Existing config dir found. Skipping initialization.")
}
}
if _, err := os.Stat(*configDir); os.IsNotExist(err) {
logger.Fatalw("Configuration directory not found. Correct the path or re-run with -init to generate initial config.", "path", configDir)
}
srv, err := hotline.NewServer(*configDir, *netInterface, *basePort, logger, &hotline.OSFileStore{})
if err != nil {
logger.Fatal(err)
}
sh := statHandler{hlServer: srv}
if *statsPort != "" {
http.HandleFunc("/", sh.RenderStats)
go func(srv *hotline.Server) {
// Use the default DefaultServeMux.
err = http.ListenAndServe(":"+*statsPort, nil)
if err != nil {
log.Fatal(err)
}
}(srv)
}
// Serve Hotline requests until program exit
logger.Fatal(srv.ListenAndServe(ctx, cancel))
}
type statHandler struct {
hlServer *hotline.Server
}
func (sh *statHandler) RenderStats(w http.ResponseWriter, _ *http.Request) {
u, err := json.Marshal(sh.hlServer.CurrentStats())
if err != nil {
panic(err)
}
_, _ = io.WriteString(w, string(u))
}
func newStdoutCore(level zapcore.Level) zapcore.Core {
encoderCfg := zap.NewProductionEncoderConfig()
encoderCfg.TimeKey = "timestamp"
encoderCfg.EncodeTime = zapcore.ISO8601TimeEncoder
return zapcore.NewCore(
zapcore.NewConsoleEncoder(encoderCfg),
zapcore.Lock(os.Stdout),
level,
)
}
func newLogFileCore(path string, level zapcore.Level) zapcore.Core {
encoderCfg := zap.NewProductionEncoderConfig()
encoderCfg.TimeKey = "timestamp"
encoderCfg.EncodeTime = zapcore.ISO8601TimeEncoder
writer := zapcore.AddSync(&lumberjack.Logger{
Filename: path,
MaxSize: 100, // MB
MaxBackups: 3,
MaxAge: 365, // days
})
return zapcore.NewCore(
zapcore.NewConsoleEncoder(encoderCfg),
writer,
level,
)
}
var zapLogLevel = map[string]zapcore.Level{
"debug": zap.DebugLevel,
"info": zap.InfoLevel,
"warn": zap.WarnLevel,
"error": zap.ErrorLevel,
}
func defaultConfigPath() (cfgPath string) {
switch runtime.GOOS {
case "windows":
cfgPath = "config/"
case "darwin":
if _, err := os.Stat("/usr/local/var/mobius/config/"); err == nil {
cfgPath = "/usr/local/var/mobius/config/"
} else if _, err := os.Stat("/opt/homebrew/var/mobius/config"); err == nil {
cfgPath = "/opt/homebrew/var/mobius/config/"
}
case "linux":
cfgPath = "/usr/local/var/mobius/config/"
default:
cfgPath = "./config/"
}
return cfgPath
}
// TODO: Simplify this mess. Why is it so difficult to recursively copy a directory?
func copyDir(src, dst string) error {
entries, err := cfgTemplate.ReadDir(src)
if err != nil {
return err
}
for _, dirEntry := range entries {
if dirEntry.IsDir() {
if err := os.MkdirAll(filepath.Join(dst, dirEntry.Name()), 0777); err != nil {
panic(err)
}
subdirEntries, _ := cfgTemplate.ReadDir(filepath.Join(src, dirEntry.Name()))
for _, subDirEntry := range subdirEntries {
f, err := os.Create(filepath.Join(dst, dirEntry.Name(), subDirEntry.Name()))
if err != nil {
return err
}
srcFile, err := cfgTemplate.Open(filepath.Join(src, dirEntry.Name(), subDirEntry.Name()))
if err != nil {
return err
}
_, err = io.Copy(f, srcFile)
if err != nil {
return err
}
f.Close()
}
} else {
f, err := os.Create(filepath.Join(dst, dirEntry.Name()))
if err != nil {
return err
}
srcFile, err := cfgTemplate.Open(filepath.Join(src, dirEntry.Name()))
if err != nil {
return err
}
_, err = io.Copy(f, srcFile)
if err != nil {
return err
}
f.Close()
}
}
return nil
}
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