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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package trace
import (
"bytes"
"io/ioutil"
"path/filepath"
"strings"
"testing"
)
func TestCorruptedInputs(t *testing.T) {
// These inputs crashed parser previously.
tests := []string{
"gotrace\x00\x020",
"gotrace\x00Q00\x020",
"gotrace\x00T00\x020",
"gotrace\x00\xc3\x0200",
"go 1.5 trace\x00\x00\x00\x00\x020",
"go 1.5 trace\x00\x00\x00\x00Q00\x020",
"go 1.5 trace\x00\x00\x00\x00T00\x020",
"go 1.5 trace\x00\x00\x00\x00\xc3\x0200",
}
for _, data := range tests {
events, err := Parse(strings.NewReader(data), "")
if err == nil || events != nil {
t.Fatalf("no error on input: %q", data)
}
}
}
func TestParseCanned(t *testing.T) {
files, err := ioutil.ReadDir("./testdata")
if err != nil {
t.Fatalf("failed to read ./testdata: %v", err)
}
for _, f := range files {
data, err := ioutil.ReadFile(filepath.Join("./testdata", f.Name()))
if err != nil {
t.Fatalf("failed to read input file: %v", err)
}
// Instead of Parse that requires a proper binary name for old traces,
// we use 'parse' that omits symbol lookup if an empty string is given.
_, _, err = parse(bytes.NewReader(data), "")
switch {
case strings.HasSuffix(f.Name(), "_good"):
if err != nil {
t.Errorf("failed to parse good trace %v: %v", f.Name(), err)
}
case strings.HasSuffix(f.Name(), "_unordered"):
if err != ErrTimeOrder {
t.Errorf("unordered trace is not detected %v: %v", f.Name(), err)
}
default:
t.Errorf("unknown input file suffix: %v", f.Name())
}
}
}
func TestParseVersion(t *testing.T) {
tests := map[string]int{
"go 1.5 trace\x00\x00\x00\x00": 1005,
"go 1.7 trace\x00\x00\x00\x00": 1007,
"go 1.10 trace\x00\x00\x00": 1010,
"go 1.25 trace\x00\x00\x00": 1025,
"go 1.234 trace\x00\x00": 1234,
"go 1.2345 trace\x00": -1,
"go 0.0 trace\x00\x00\x00\x00": -1,
"go a.b trace\x00\x00\x00\x00": -1,
}
for header, ver := range tests {
ver1, err := parseHeader([]byte(header))
if ver == -1 {
if err == nil {
t.Fatalf("no error on input: %q, version %v", header, ver1)
}
} else {
if err != nil {
t.Fatalf("failed to parse: %q (%v)", header, err)
}
if ver != ver1 {
t.Fatalf("wrong version: %v, want %v, input: %q", ver1, ver, header)
}
}
}
}
func TestTimestampOverflow(t *testing.T) {
// Test that parser correctly handles large timestamps (long tracing).
w := newWriter()
w.emit(EvBatch, 0, 0)
w.emit(EvFrequency, 1e9)
for ts := uint64(1); ts < 1e16; ts *= 2 {
w.emit(EvGoCreate, ts, ts, 0, 0)
}
if _, err := Parse(w, ""); err != nil {
t.Fatalf("failed to parse: %v", err)
}
}
type writer struct {
bytes.Buffer
}
func newWriter() *writer {
w := new(writer)
w.Write([]byte("go 1.7 trace\x00\x00\x00\x00"))
return w
}
func (w *writer) emit(typ byte, args ...uint64) {
nargs := byte(len(args)) - 1
if nargs > 3 {
nargs = 3
}
buf := []byte{typ | nargs<<6}
if nargs == 3 {
buf = append(buf, 0)
}
for _, a := range args {
buf = appendVarint(buf, a)
}
if nargs == 3 {
buf[1] = byte(len(buf) - 2)
}
n, err := w.Write(buf)
if n != len(buf) || err != nil {
panic("failed to write")
}
}
func appendVarint(buf []byte, v uint64) []byte {
for ; v >= 0x80; v >>= 7 {
buf = append(buf, 0x80|byte(v))
}
buf = append(buf, byte(v))
return buf
}
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