tail.go

package main

import (
	"fmt"
	"log"
	"net/http"
	"os"

	"github.com/hpcloud/tail"
)

func write(w http.ResponseWriter, s string) {
	flusher, ok := w.(http.Flusher)
	if !ok {
		panic("Expected http.ResponseWriter to be an http.CloseNotifier")
	}
	fmt.Fprintf(w, s)
	flusher.Flush()
}

func stream(w http.ResponseWriter, r *http.Request) {
	t, _ := tail.TailFile(os.Args[1], tail.Config{Follow: true})
	for line := range t.Lines {
		fmt.Println(line.Text)
		write(w, line.Text+"\n")
	}
}

func main() {
	http.HandleFunc("/", stream)
	err := http.ListenAndServe(":53290", nil)
	if err != nil {
		log.Fatal("ListenAndServe: ", err)
	}
}