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read.go
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read.go
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package gotail
import (
"bufio"
"io"
"os"
)
func ReadByLine(filename string, offset int64, output func(string)) int64 {
f, err := os.Open(filename)
if err != nil {
panic(err)
}
_, err = f.Seek(offset, io.SeekCurrent)
if err != nil {
panic(err)
}
defer f.Close()
r := bufio.NewReader(f)
for {
line, _, err := r.ReadLine()
if err == io.EOF { // 读到文件末尾
break
} else {
output(string(line))
}
}
// TODO 注意f.Stat()返回顺序,需在处理句柄末端返回,防止并发问题产生。
info, err := f.Stat()
if err != nil {
panic(err)
}
return info.Size()
}
func ReadByBytes(filename string, offset int64, output func([]byte, int)) int64 {
f, err := os.Open(filename)
if err != nil {
panic(err)
}
_, err = f.Seek(offset, io.SeekCurrent)
if err != nil {
panic(err)
}
defer f.Close()
r := bufio.NewReader(f)
info, err := f.Stat()
if err != nil {
panic(err)
}
b := make([]byte, 1024)
for {
i, err := r.Read(b)
if err == io.EOF {
break
} else {
output(b, i)
}
b = b[:]
}
return info.Size()
}
func ReadSize(filename string) int64 {
f, err := os.Open(filename)
if err != nil {
panic(err)
}
defer f.Close()
info, err := f.Stat()
if err != nil {
panic(err)
}
return info.Size()
}