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125 lines
3.2 KiB
125 lines
3.2 KiB
package main
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import (
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"flag"
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"fmt"
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"io"
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"os"
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"strconv"
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"strings"
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auto "github.com/tendermint/tendermint/libs/autofile"
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tmos "github.com/tendermint/tendermint/libs/os"
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)
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const Version = "0.0.1"
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const readBufferSize = 1024 // 1KB at a time
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// Parse command-line options
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func parseFlags() (headPath string, chopSize int64, limitSize int64, version bool) {
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var flagSet = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
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var chopSizeStr, limitSizeStr string
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flagSet.StringVar(&headPath, "head", "logjack.out", "Destination (head) file.")
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flagSet.StringVar(&chopSizeStr, "chop", "100M", "Move file if greater than this")
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flagSet.StringVar(&limitSizeStr, "limit", "10G", "Only keep this much (for each specified file). Remove old files.")
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flagSet.BoolVar(&version, "version", false, "Version")
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if err := flagSet.Parse(os.Args[1:]); err != nil {
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fmt.Printf("err parsing flag: %v\n", err)
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os.Exit(1)
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}
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chopSize = parseBytesize(chopSizeStr)
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limitSize = parseBytesize(limitSizeStr)
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return
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}
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type fmtLogger struct{}
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func (fmtLogger) Info(msg string, keyvals ...interface{}) {
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strs := make([]string, len(keyvals))
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for i, kv := range keyvals {
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strs[i] = fmt.Sprintf("%v", kv)
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}
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fmt.Printf("%s %s\n", msg, strings.Join(strs, ","))
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}
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func main() {
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// Stop upon receiving SIGTERM or CTRL-C.
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tmos.TrapSignal(fmtLogger{}, func() {
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fmt.Println("logjack shutting down")
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})
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// Read options
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headPath, chopSize, limitSize, version := parseFlags()
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if version {
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fmt.Printf("logjack version %v\n", Version)
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return
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}
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// Open Group
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group, err := auto.OpenGroup(headPath, auto.GroupHeadSizeLimit(chopSize), auto.GroupTotalSizeLimit(limitSize))
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if err != nil {
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fmt.Printf("logjack couldn't create output file %v\n", headPath)
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os.Exit(1)
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}
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if err = group.Start(); err != nil {
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fmt.Printf("logjack couldn't start with file %v\n", headPath)
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os.Exit(1)
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}
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// Forever read from stdin and write to AutoFile.
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buf := make([]byte, readBufferSize)
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for {
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n, err := os.Stdin.Read(buf)
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if err != nil {
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if err := group.Stop(); err != nil {
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fmt.Fprintf(os.Stderr, "logjack stopped with error %v\n", headPath)
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os.Exit(1)
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}
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if err == io.EOF {
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os.Exit(0)
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} else {
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fmt.Println("logjack errored")
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os.Exit(1)
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}
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}
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_, err = group.Write(buf[:n])
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if err != nil {
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fmt.Fprintf(os.Stderr, "logjack failed write with error %v\n", headPath)
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os.Exit(1)
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}
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if err := group.FlushAndSync(); err != nil {
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fmt.Fprintf(os.Stderr, "logjack flushsync fail with error %v\n", headPath)
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os.Exit(1)
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}
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}
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}
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func parseBytesize(chopSize string) int64 {
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// Handle suffix multiplier
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var multiplier int64 = 1
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if strings.HasSuffix(chopSize, "T") {
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multiplier = 1042 * 1024 * 1024 * 1024
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chopSize = chopSize[:len(chopSize)-1]
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}
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if strings.HasSuffix(chopSize, "G") {
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multiplier = 1042 * 1024 * 1024
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chopSize = chopSize[:len(chopSize)-1]
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}
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if strings.HasSuffix(chopSize, "M") {
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multiplier = 1042 * 1024
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chopSize = chopSize[:len(chopSize)-1]
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}
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if strings.HasSuffix(chopSize, "K") {
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multiplier = 1042
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chopSize = chopSize[:len(chopSize)-1]
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}
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// Parse the numeric part
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chopSizeInt, err := strconv.Atoi(chopSize)
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if err != nil {
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panic(err)
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}
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return int64(chopSizeInt) * multiplier
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}
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