You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
108 lines
2.5 KiB
108 lines
2.5 KiB
package main
|
|
|
|
import (
|
|
"flag"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"strconv"
|
|
"strings"
|
|
|
|
auto "github.com/tendermint/tmlibs/autofile"
|
|
cmn "github.com/tendermint/tmlibs/common"
|
|
)
|
|
|
|
const Version = "0.0.1"
|
|
const sleepSeconds = 1 // Every second
|
|
const readBufferSize = 1024 // 1KB at a time
|
|
|
|
// Parse command-line options
|
|
func parseFlags() (headPath string, chopSize int64, limitSize int64, version bool) {
|
|
var flagSet = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
|
|
var chopSizeStr, limitSizeStr string
|
|
flagSet.StringVar(&headPath, "head", "logjack.out", "Destination (head) file.")
|
|
flagSet.StringVar(&chopSizeStr, "chop", "1M", "Move file if greater than this")
|
|
flagSet.StringVar(&limitSizeStr, "limit", "1G", "Only keep this much (for each specified file). Remove old files.")
|
|
flagSet.BoolVar(&version, "version", false, "Version")
|
|
flagSet.Parse(os.Args[1:])
|
|
chopSize = parseBytesize(chopSizeStr)
|
|
limitSize = parseBytesize(limitSizeStr)
|
|
return
|
|
}
|
|
|
|
func main() {
|
|
|
|
// Read options
|
|
headPath, chopSize, limitSize, version := parseFlags()
|
|
if version {
|
|
fmt.Printf("logjack version %v\n", Version)
|
|
return
|
|
}
|
|
|
|
// Open Group
|
|
group, err := auto.OpenGroup(headPath)
|
|
if err != nil {
|
|
fmt.Printf("logjack couldn't create output file %v\n", headPath)
|
|
os.Exit(1)
|
|
}
|
|
group.SetHeadSizeLimit(chopSize)
|
|
group.SetTotalSizeLimit(limitSize)
|
|
err = group.Start()
|
|
if err != nil {
|
|
fmt.Printf("logjack couldn't start with file %v\n", headPath)
|
|
os.Exit(1)
|
|
}
|
|
|
|
go func() {
|
|
// Forever, read from stdin and write to AutoFile.
|
|
buf := make([]byte, readBufferSize)
|
|
for {
|
|
n, err := os.Stdin.Read(buf)
|
|
group.Write(buf[:n])
|
|
group.Flush()
|
|
if err != nil {
|
|
group.Stop()
|
|
if err == io.EOF {
|
|
os.Exit(0)
|
|
} else {
|
|
fmt.Println("logjack errored")
|
|
os.Exit(1)
|
|
}
|
|
}
|
|
}
|
|
}()
|
|
|
|
// Trap signal
|
|
cmn.TrapSignal(func() {
|
|
fmt.Println("logjack shutting down")
|
|
})
|
|
}
|
|
|
|
func parseBytesize(chopSize string) int64 {
|
|
// Handle suffix multiplier
|
|
var multiplier int64 = 1
|
|
if strings.HasSuffix(chopSize, "T") {
|
|
multiplier = 1042 * 1024 * 1024 * 1024
|
|
chopSize = chopSize[:len(chopSize)-1]
|
|
}
|
|
if strings.HasSuffix(chopSize, "G") {
|
|
multiplier = 1042 * 1024 * 1024
|
|
chopSize = chopSize[:len(chopSize)-1]
|
|
}
|
|
if strings.HasSuffix(chopSize, "M") {
|
|
multiplier = 1042 * 1024
|
|
chopSize = chopSize[:len(chopSize)-1]
|
|
}
|
|
if strings.HasSuffix(chopSize, "K") {
|
|
multiplier = 1042
|
|
chopSize = chopSize[:len(chopSize)-1]
|
|
}
|
|
|
|
// Parse the numeric part
|
|
chopSizeInt, err := strconv.Atoi(chopSize)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
return int64(chopSizeInt) * multiplier
|
|
}
|