package main
import (
"fmt"
"html/template"
"log"
"os"
"os/signal"
"time"
"github.com/fsnotify/fsnotify"
"github.com/getwtxt/registry"
"github.com/spf13/pflag"
"github.com/spf13/viper"
"github.com/syndtr/goleveldb/leveldb"
)
const getwtxt = "0.1"
// command line flags
var (
flagVersion *bool = pflag.BoolP("version", "v", false, "Display version information, then exit")
flagHelp *bool = pflag.BoolP("help", "h", false, "")
)
// config object
var confObj = &Configuration{}
// signals to close the log file
var closeLog = make(chan bool, 1)
// used to transmit database pointer after
// initialization
var dbChan = make(chan *leveldb.DB, 1)
// templates
var tmpls *template.Template
// registry index
var twtxtCache = registry.NewIndex()
// remote registry listing
var remoteRegistries = &RemoteRegistries{}
// static assets cache
var staticCache = &struct {
index []byte
indexMod time.Time
css []byte
cssMod time.Time
}{
index: nil,
indexMod: time.Time{},
css: nil,
cssMod: time.Time{},
}
func initGetwtxt() {
checkFlags()
titleScreen()
initConfig()
initLogging()
tmpls = initTemplates()
initDatabase()
watchForInterrupt()
}
func checkFlags() {
pflag.Parse()
if *flagVersion {
titleScreen()
os.Exit(0)
}
if *flagHelp {
titleScreen()
helpScreen()
os.Exit(0)
}
}
func initConfig() {
viper.SetConfigName("getwtxt")
viper.SetConfigType("json")
viper.AddConfigPath(".")
viper.AddConfigPath("/usr/local/getwtxt")
viper.AddConfigPath("/etc")
viper.AddConfigPath("/usr/local/etc")
log.Printf("Loading configuration ...\n")
if err := viper.ReadInConfig(); err != nil {
log.Printf("Error reading config file: %v\n", err)
log.Printf("Using defaults ...\n")
}
// separate thread to watch for config file changes.
// will log event then run rebindConfig()
viper.WatchConfig()
viper.OnConfigChange(func(e fsnotify.Event) {
log.Printf("Config file change detected. Reloading...\n")
rebindConfig()
})
viper.SetDefault("ListenPort", 9001)
viper.SetDefault("LogFile", "getwtxt.log")
viper.SetDefault("DatabasePath", "getwtxt.db")
viper.SetDefault("StdoutLogging", false)
viper.SetDefault("ReCacheInterval", "1h")
viper.SetDefault("DatabasePushInterval", "5m")
confObj.Mu.Lock()
confObj.Port = viper.GetInt("ListenPort")
confObj.LogFile = viper.GetString("LogFile")
confObj.DBPath = viper.GetString("DatabasePath")
log.Printf("Using database: %v\n", confObj.DBPath)
confObj.StdoutLogging = viper.GetBool("StdoutLogging")
if confObj.StdoutLogging {
log.Printf("Logging to stdout\n")
} else {
log.Printf("Logging to %v\n", confObj.LogFile)
}
confObj.CacheInterval = viper.GetDuration("StatusFetchInterval")
log.Printf("User status fetch interval: %v\n", confObj.CacheInterval)
confObj.DBInterval = viper.GetDuration("DatabasePushInterval")
log.Printf("Database push interval: %v\n", confObj.DBInterval)
confObj.LastCache = time.Now()
confObj.LastPush = time.Now()
confObj.Version = getwtxt
confObj.Instance.Name = viper.GetString("Instance.SiteName")
confObj.Instance.URL = viper.GetString("Instance.URL")
confObj.Instance.Owner = viper.GetString("Instance.OwnerName")
confObj.Instance.Mail = viper.GetString("Instance.Email")
confObj.Instance.Desc = viper.GetString("Instance.Description")
confObj.Mu.Unlock()
}
func initLogging() {
// only open a log file if it's necessary
confObj.Mu.RLock()
if confObj.StdoutLogging {
log.SetOutput(os.Stdout)
} else {
logfile, err := os.OpenFile(confObj.LogFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0600)
if err != nil {
log.Printf("Could not open log file: %v\n", err)
}
// Listen for the signal to close the log file
// in a separate thread. Passing it as an argument
// to prevent race conditions when the config is
// reloaded.
go func(logfile *os.File) {
<-closeLog
log.Printf("Closing log file ...\n")
err = logfile.Close()
if err != nil {
log.Printf("Couldn't close log file: %v\n", err)
}
}(logfile)
log.SetOutput(logfile)
}
confObj.Mu.RUnlock()
}
func rebindConfig() {
// signal to close the log file then wait
confObj.Mu.RLock()
if !confObj.StdoutLogging {
closeLog <- true
}
confObj.Mu.RUnlock()
// reassign values to the config object
confObj.Mu.Lock()
confObj.LogFile = viper.GetString("LogFile")
confObj.DBPath = viper.GetString("DatabasePath")
confObj.StdoutLogging = viper.GetBool("StdoutLogging")
confObj.CacheInterval = viper.GetDuration("StatusFetchInterval")
confObj.DBInterval = viper.GetDuration("DatabasePushInterval")
confObj.Instance.Name = viper.GetString("Instance.SiteName")
confObj.Instance.URL = viper.GetString("Instance.URL")
confObj.Instance.Owner = viper.GetString("Instance.OwnerName")
confObj.Instance.Mail = viper.GetString("Instance.Email")
confObj.Instance.Desc = viper.GetString("Instance.Description")
confObj.Mu.Unlock()
// reinitialize logging
initLogging()
}
// Parse the HTML templates
func initTemplates() *template.Template {
return template.Must(template.ParseFiles("assets/tmpl/index.html"))
}
// Pull DB data into cache, if available.
func initDatabase() {
confObj.Mu.RLock()
db, err := leveldb.OpenFile(confObj.DBPath, nil)
confObj.Mu.RUnlock()
if err != nil {
log.Fatalf("%v\n", err)
}
// Send the database reference into
// the aether.
dbChan <- db
pullDatabase()
go cacheAndPush()
}
// Watch for SIGINT aka ^C
// Close the log file then exit
func watchForInterrupt() {
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
for sigint := range c {
log.Printf("\n\nCaught %v. Cleaning up ...\n", sigint)
confObj.Mu.RLock()
// Close the database cleanly
log.Printf("Closing database connection to %v...\n", confObj.DBPath)
db := <-dbChan
if err := db.Close(); err != nil {
log.Printf("%v\n", err)
}
if !confObj.StdoutLogging {
// signal to close the log file
closeLog <- true
}
confObj.Mu.RUnlock()
close(dbChan)
close(closeLog)
// Let everything catch up
time.Sleep(100 * time.Millisecond)
os.Exit(0)
}
}()
}
func titleScreen() {
fmt.Printf(`
_ _ _
__ _ ___| |___ _| |___ _| |_
/ _ |/ _ \ __\ \ /\ / / __\ \/ / __|
| (_| | __/ |_ \ V V /| |_ > <| |_
\__, |\___|\__| \_/\_/ \__/_/\_\\__|
|___/
version ` + getwtxt + `
github.com/getwtxt/getwtxt
GPL v3
`)
}
func helpScreen() {
fmt.Printf(`
Help File
Sections:
`)
}