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134 lines
2.8 KiB
Go

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