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134 lines
2.8 KiB
Go
134 lines
2.8 KiB
Go
package main
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import (
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"compress/bzip2"
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"flag"
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"fmt"
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"io"
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"os"
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"runtime/pprof"
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"strings"
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)
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const (
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replayHeader = "PBDEMS2\000"
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)
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func ensureNewline(t string) string {
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if strings.HasSuffix(t, "\n") {
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return t
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}
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return t + "\n"
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}
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func bail(status int, t string, args ...interface{}) {
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var out io.Writer
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if status == 0 {
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out = os.Stdout
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} else {
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out = os.Stderr
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}
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fmt.Fprintf(out, ensureNewline(t), args...)
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os.Exit(status)
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}
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func wrap(err error, t string, args ...interface{}) error {
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if err == io.EOF {
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return io.EOF
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}
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return fmt.Errorf(t+": %v", append(args, err)...)
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}
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type options struct {
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b bool // bzip compression flag
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v bool // verbose flag
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f string // input file
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memprofile string
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cpuprofile string
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messages bool // dump messages or no
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packets bool // dump packets or no
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}
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func (o options) input() (io.Reader, error) {
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var r io.Reader
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if o.f == "--" {
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r = os.Stdin
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} else {
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fi, err := os.Open(o.f)
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if err != nil {
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return nil, wrap(err, "unable to open file %s", o.f)
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}
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r = fi
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}
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if o.b {
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r = bzip2.NewReader(r)
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}
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return r, nil
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}
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func memprofile(dest string) {
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fmt.Println("writing mem profile to", dest)
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w, err := os.Create(dest)
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if err != nil {
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fmt.Fprintf(os.Stderr, "unable to open memprofile output %s: %v\n", dest, err)
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} else {
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defer w.Close()
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err := pprof.WriteHeapProfile(w)
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if err != nil {
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fmt.Fprintf(os.Stderr, "unable to write heap profile: %v\n", err)
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}
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}
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}
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func cpuprofile(dest string) func() {
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fmt.Println("writing cpu profile to", dest)
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w, err := os.Create(dest)
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if err != nil {
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fmt.Fprintf(os.Stderr, "unable to open cpuprofile output %s: %v\n", dest, err)
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return func() {}
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} else {
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pprof.StartCPUProfile(w)
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return func() {
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pprof.StopCPUProfile()
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w.Close()
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}
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}
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}
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func main() {
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var opts options
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flag.BoolVar(&opts.b, "b", false, "input is expected to be bzip-compressed")
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flag.BoolVar(&opts.v, "v", false, "verbose mode")
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flag.StringVar(&opts.f, "f", "--", "input file to be used. -- means stdin")
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flag.BoolVar(&opts.messages, "messages", false, "dump top-level messages to stdout")
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flag.BoolVar(&opts.packets, "packets", false, "dump packets to stdout")
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flag.StringVar(&opts.memprofile, "memprofile", "", "memory profile destination")
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flag.StringVar(&opts.cpuprofile, "cpuprofile", "", "cpu profile destination")
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flag.Parse()
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if opts.memprofile != "" {
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defer memprofile(opts.memprofile)
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}
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if opts.cpuprofile != "" {
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defer cpuprofile(opts.cpuprofile)()
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}
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r, err := opts.input()
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if err != nil {
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bail(1, "input error: %v", err)
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}
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p := newParser(r)
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p.dumpMessages = opts.messages
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p.dumpPackets = opts.packets
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if err := p.start(); err != nil {
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bail(1, "parse error: %v", err)
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}
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if err := p.run(); err != nil && err != io.EOF {
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bail(1, "run error: %v", err)
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}
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}
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