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package main
import (
"log"
"os"
"time"
"github.com/fsnotify/fsnotify"
"github.com/spf13/pflag"
"github.com/spf13/viper"
)
// command line flags
var (
port *int = pflag.IntP("port", "p", 9001, "getwtxt will serve from this port")
logfile *string = pflag.StringP("logfile", "l", "getwtxt.log", "File for logging output")
twtxtfile *string = pflag.StringP("twtxtfile", "f", "/var/twtxt/twtxt.txt", "Registry file for getwtxt")
)
// config object
var confObj = &configuration{}
// signals to close the log file
var closelog = make(chan bool, 1)
func init() {
initConfig()
pflag.Parse()
viper.BindPFlags(pflag.CommandLine)
initLogging()
}
func initConfig() {
viper.SetConfigName("getwtxt")
viper.AddConfigPath(".")
viper.AddConfigPath("/usr/local/getwtxt")
viper.AddConfigPath("/etc")
viper.AddConfigPath("/usr/local/etc")
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("port", 9001)
viper.SetDefault("logfile", "getwtxt.log")
viper.SetDefault("twtxtfile", "/var/twtxt/twtxt.txt")
confObj.port = viper.GetInt("port")
confObj.logfile = viper.GetString("logfile")
confObj.twtxtfile = viper.GetString("twtxtfile")
}
func initLogging() {
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
go func() {
<-closelog
log.Printf("Closing log file ...\n")
err = logfile.Close()
if err != nil {
log.Printf("Couldn't close log file: %v\n", err)
}
}()
log.SetOutput(logfile)
}
func rebindConfig() {
// reassign values to the config object
confObj.port = viper.GetInt("port")
confObj.logfile = viper.GetString("logfile")
confObj.twtxtfile = viper.GetString("twtxtfile")
// signal to close the log file then wait
closelog <- true
time.Sleep(50 * time.Millisecond)
// reinitialize logging
initLogging()
}
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