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package main
import (
"flag"
"fmt"
"io"
"os"
"strconv"
"strings"
auto "github.com/tendermint/tendermint/libs/autofile"
cmn "github.com/tendermint/tendermint/libs/common"
)
const Version = "0.0.1"
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", "100M", "Move file if greater than this")
flagSet.StringVar(&limitSizeStr, "limit", "10G", "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
}