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stacktrace_test.go
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stacktrace_test.go
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package raven
import (
"fmt"
"go/build"
"io/ioutil"
"os"
"path/filepath"
"runtime"
"strings"
"testing"
"github.com/pkg/errors"
)
// a
func trace() *Stacktrace {
return NewStacktrace(0, 2, []string{thisPackage})
// b
}
func init() {
thisFile, thisPackage = derivePackage()
functionNameTests = []FunctionNameTest{
{0, thisPackage, "TestFunctionName"},
{1, "testing", "tRunner"},
{2, "runtime", "goexit"},
{100, "", ""},
}
}
type FunctionNameTest struct {
skip int
pack string
name string
}
var (
thisFile string
thisPackage string
functionNameTests []FunctionNameTest
)
func TestFunctionName(t *testing.T) {
for _, test := range functionNameTests {
pc, _, _, _ := runtime.Caller(test.skip)
pack, name := functionName(runtime.FuncForPC(pc).Name())
if pack != test.pack {
t.Errorf("incorrect package; got %s, want %s", pack, test.pack)
}
if name != test.name {
t.Errorf("incorrect function; got %s, want %s", name, test.name)
}
}
}
func TestStacktrace(t *testing.T) {
st := trace()
if st == nil || st.Frames == nil {
t.Error("got nil stacktrace")
}
if len(st.Frames) == 0 {
t.Error("got zero frames")
}
}
func TestStacktraceFrame(t *testing.T) {
st := trace()
f := st.Frames[len(st.Frames)-1]
_, filename, _, _ := runtime.Caller(0)
runningInVendored := strings.Contains(filename, "vendor")
if f.Filename != thisFile {
t.Errorf("incorrect Filename; got %s, want %s", f.Filename, thisFile)
}
if !strings.HasSuffix(f.AbsolutePath, thisFile) {
t.Error("incorrect AbsolutePath:", f.AbsolutePath)
}
if f.Function != "trace" {
t.Error("incorrect Function:", f.Function)
}
if f.Module != thisPackage {
t.Error("incorrect Module:", f.Module)
}
if f.Lineno != 16 {
t.Error("incorrect Lineno:", f.Lineno)
}
if f.InApp != !runningInVendored {
t.Error("expected InApp to be true")
}
if f.InApp && st.Culprit() != fmt.Sprintf("%s.trace", thisPackage) {
t.Error("incorrect Culprit:", st.Culprit())
}
}
func TestStacktraceContext(t *testing.T) {
st := trace()
f := st.Frames[len(st.Frames)-1]
if f.ContextLine != "\treturn NewStacktrace(0, 2, []string{thisPackage})" {
t.Errorf("incorrect ContextLine: %#v", f.ContextLine)
}
if len(f.PreContext) != 2 || f.PreContext[0] != "// a" || f.PreContext[1] != "func trace() *Stacktrace {" {
t.Errorf("incorrect PreContext %#v", f.PreContext)
}
if len(f.PostContext) != 2 || f.PostContext[0] != "\t// b" || f.PostContext[1] != "}" {
t.Errorf("incorrect PostContext %#v", f.PostContext)
}
}
func traceErrorWithStack() error {
return errors.WithStack(errors.New("oops"))
}
func TestStacktraceErrorsWithStack(t *testing.T) {
err := traceErrorWithStack()
st := GetOrNewStacktrace(err, 0, 0, []string{thisPackage})
if st == nil || st.Frames == nil {
t.Error("failed to get stacktrace from errors.WithStack() error")
}
if len(st.Frames) != 3 {
t.Error("unexpected number of stack frames")
}
if st.Frames[0] == nil {
t.Error("frame 0 is nil")
}
// 0: tRunner
f := st.Frames[0]
if f.Function != "tRunner" {
t.Error("incorrect Function", f.Function)
}
// 1: TestStacktraceErrorsWithStack (this function)
f = st.Frames[1]
if f.Function != "TestStacktraceErrorsWithStack" {
t.Error("incorrect Function", f.Function)
}
if f.Module != thisPackage {
t.Error("incorrect Module:", f.Module)
}
// 2: traceErrorWithStack
f = st.Frames[2]
if f.Function != "traceErrorWithStack" {
t.Error("incorrect Function", f.Function)
}
if f.Module != thisPackage {
t.Error("incorrect Module:", f.Module)
}
// for i, frame := range st.Frames {
// fmt.Fprintf(os.Stderr, "[%d]: %+v\n", i, frame)
// }
}
func derivePackage() (file, pack string) {
// Get file name by seeking caller's file name.
_, callerFile, _, ok := runtime.Caller(1)
if !ok {
return
}
// Trim file name
file = callerFile
for _, dir := range build.Default.SrcDirs() {
dir := dir + string(filepath.Separator)
if trimmed := strings.TrimPrefix(callerFile, dir); len(trimmed) < len(file) {
file = trimmed
}
}
// Now derive package name
dir := filepath.Dir(callerFile)
dirPkg, err := build.ImportDir(dir, build.AllowBinary)
if err != nil {
return
}
pack = dirPkg.ImportPath
return
}
// TestNewStacktrace_outOfBounds verifies that a context exceeding the number
// of lines in a file does not cause a panic.
func TestNewStacktrace_outOfBounds(t *testing.T) {
st := NewStacktrace(0, 1000000, []string{thisPackage})
f := st.Frames[len(st.Frames)-1]
if f.ContextLine != "\tst := NewStacktrace(0, 1000000, []string{thisPackage})" {
t.Errorf("incorrect ContextLine: %#v", f.ContextLine)
}
}
func TestNewStacktrace_noFrames(t *testing.T) {
st := NewStacktrace(999999999, 0, []string{})
if st != nil {
t.Errorf("expected st.Frames to be nil: %v", st)
}
}
func TestFileContext(t *testing.T) {
// reset the cache
loader := &fsLoader{cache: make(map[string][][]byte)}
tempdir, err := ioutil.TempDir("", "")
if err != nil {
t.Fatal("failed to create temporary directory:", err)
}
defer func() {
err := os.RemoveAll(tempdir)
if err != nil {
fmt.Println("failed to remove temporary directory:", err)
}
}()
okPath := filepath.Join(tempdir, "ok")
missingPath := filepath.Join(tempdir, "missing")
noPermissionPath := filepath.Join(tempdir, "noperms")
err = ioutil.WriteFile(okPath, []byte("hello\nworld\n"), 0600)
if err != nil {
t.Fatal("failed writing file:", err)
}
err = ioutil.WriteFile(noPermissionPath, []byte("no access\n"), 0000)
if err != nil {
t.Fatal("failed writing file:", err)
}
tests := []struct {
path string
expectedLines int
expectedIndex int
}{
{okPath, 1, 0},
{missingPath, 0, 0},
{noPermissionPath, 0, 0},
}
for i, test := range tests {
lines, index := loader.Load(test.path, 1, 0)
if !(len(lines) == test.expectedLines && index == test.expectedIndex) {
t.Errorf("%d: fileContext(%#v, 1, 0) = %v, %v; expected len()=%d, %d",
i, test.path, lines, index, test.expectedLines, test.expectedIndex)
}
cacheLen := len(loader.cache)
if cacheLen != i+1 {
t.Errorf("%d: result was not cached; len=%d", i, cacheLen)
}
}
}