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package main
import (
"flag"
"fmt"
"log"
"os"
"os/signal"
"path/filepath"
"syscall"
"github.com/asaskevich/govalidator"
"github.com/hpcloud/tail"
)
var (
logPath string
webhookURL string
username string
channel string
color string
iconURL string
logger *log.Logger
debugDest string
debug bool
tailer *tail.Tail
)
func init() {
flag.StringVar(&logPath, "log-path", "", "Log to monitor")
flag.StringVar(&webhookURL, "webhook", "", "Webhook to forward log entries to")
flag.StringVar(&username, "username", "logbot", "Username to post as")
flag.StringVar(&channel, "channel", "", "Channel to post log entries to")
flag.StringVar(&color, "color", "default", "Color for entry, either named or hex with `#`")
flag.StringVar(&iconURL, "icon-url", "", "URL of icon to use for bot")
flag.StringVar(&debugDest, "debug-dest", "os.Stdout", "Destination for debug and other messages, omit to log to Stdout")
flag.BoolVar(&debug, "debug", false, "Include additional log data for debugging")
flag.Parse()
setUpLogger()
validatePath(&logPath)
if !govalidator.IsURL(webhookURL) || len(channel) < 2 {
usage()
}
}
func main() {
logger.Printf("Monitoring %s", logPath)
logger.Printf("Forwarding to channel \"%s\" as user \"%s\" at %s", channel, username, webhookURL)
sig := make(chan os.Signal, 1)
signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
go tailLog()
caughtSig := <-sig
tailer.Stop()
tailer.Cleanup()
logger.Printf("Stopping, got signal %s", caughtSig)
}
func tailLog() {
t, err := tail.TailFile(logPath, tail.Config{Follow: true, MustExist: true, ReOpen: true})
tailer = t
if err != nil {
logger.Println(err)
usage()
}
for line := range t.Lines {
sendLine(line)
}
}
func sendLine(line *tail.Line) {
logger.Println(line.Text)
}
func setUpLogger() {
logOpts := log.Ldate | log.Ltime | log.LUTC | log.Lshortfile
if debugDest == "os.Stdout" {
logger = log.New(os.Stdout, "DEBUG: ", logOpts)
} else {
path, err := filepath.Abs(debugDest)
if err != nil {
logger.Fatal(err)
}
logFile, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
if err != nil {
log.Fatal(err)
}
logger = log.New(logFile, "", logOpts)
}
}
func validatePath(path *string) {
if len(*path) > 1 {
var err error
*path, err = filepath.Abs(*path)
if err != nil {
fmt.Printf("Error: %s", err.Error())
os.Exit(3)
}
if _, err = os.Stat(*path); os.IsNotExist(err) {
usage()
}
} else {
usage()
}
}
func usage() {
flag.Usage()
os.Exit(3)
}