[Go] go waiting to read the last line of the data content

This code is a reference to the Mu class network video tutorials, mainly f.Seek (0, os.SEEK_END) moved to the end, but there is a small problem, when the file is re-opened to empty the contents emptied, it is no longer not to read the data, such as the open reading echo ''> 1.log this will never be read, tail package is to solve this problem

package main

import (
    "bufio"
    "fmt"
    "io"
    "os"
    "strings"
    "time"
)

func main() {
    readChannel := make(chan string)
    go readFile(readChannel)
    for r := range readChannel {
        fmt.Println(r)
    }
}
func readFile(readChannel chan string) {
    f, err := os.Open("1.txt")
    if err != nil {
        panic(fmt.Sprintf("open file error:%s", err.Error()))
    }
    //移动到文件末尾
    f.Seek(0, os.SEEK_END)
    reader := bufio.NewReader(f)
    for {
        line, err := reader.ReadBytes('\n')
        fmt.Println(err)
        if err == io.EOF {
            time.Sleep(time.Second)
            continue
        } else if err != nil {
            panic("ReadBytes error:" + err.Error())
        }

        lineStr := strings.TrimSpace(string(line))
        readChannel <- lineStr
    }
}

When using tail bag test, have re-open the file