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lumberjack_test.go
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lumberjack_test.go
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package lumberjack
import (
"bytes"
"compress/gzip"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"testing"
"time"
)
// !!!NOTE!!!
//
// Running these tests in parallel will almost certainly cause sporadic (or even
// regular) failures, because they're all messing with the same global variable
// that controls the logic's mocked time.Now. So... don't do that.
// Since all the tests uses the time to determine filenames etc, we need to
// control the wall clock as much as possible, which means having a wall clock
// that doesn't change unless we want it to.
var fakeCurrentTime = time.Now()
func fakeTime() time.Time {
return fakeCurrentTime
}
func TestNewFile(t *testing.T) {
currentTime = fakeTime
dir := makeTempDir("TestNewFile", t)
defer os.RemoveAll(dir)
l := &Logger{
Filename: logFile(dir),
}
defer l.Close()
b := []byte("boo!")
n, err := l.Write(b)
isNil(err, t)
equals(len(b), n, t)
existsWithContent(logFile(dir), b, t)
fileCount(dir, 1, t)
}
func TestOpenExisting(t *testing.T) {
currentTime = fakeTime
dir := makeTempDir("TestOpenExisting", t)
defer os.RemoveAll(dir)
filename := logFile(dir)
data := []byte("foo!")
err := ioutil.WriteFile(filename, data, 0644)
isNil(err, t)
existsWithContent(filename, data, t)
l := &Logger{
Filename: filename,
}
defer l.Close()
b := []byte("boo!")
n, err := l.Write(b)
isNil(err, t)
equals(len(b), n, t)
// make sure the file got appended
existsWithContent(filename, append(data, b...), t)
// make sure no other files were created
fileCount(dir, 1, t)
}
func TestWriteTooLong(t *testing.T) {
currentTime = fakeTime
megabyte = 1
dir := makeTempDir("TestWriteTooLong", t)
defer os.RemoveAll(dir)
l := &Logger{
Filename: logFile(dir),
MaxSize: 5,
}
defer l.Close()
b := []byte("booooooooooooooo!")
n, err := l.Write(b)
notNil(err, t)
equals(0, n, t)
equals(err.Error(),
fmt.Sprintf("write length %d exceeds maximum file size %d", len(b), l.MaxSize), t)
_, err = os.Stat(logFile(dir))
assert(os.IsNotExist(err), t, "File exists, but should not have been created")
}
func TestMakeLogDir(t *testing.T) {
currentTime = fakeTime
dir := time.Now().Format("TestMakeLogDir" + DefaultTimeFormat)
dir = filepath.Join(os.TempDir(), dir)
defer os.RemoveAll(dir)
filename := logFile(dir)
l := &Logger{
Filename: filename,
}
defer l.Close()
b := []byte("boo!")
n, err := l.Write(b)
isNil(err, t)
equals(len(b), n, t)
existsWithContent(logFile(dir), b, t)
fileCount(dir, 1, t)
}
func TestDefaultFilename(t *testing.T) {
currentTime = fakeTime
dir := os.TempDir()
filename := filepath.Join(dir, filepath.Base(os.Args[0])+"-lumberjack.log")
defer os.Remove(filename)
l := &Logger{}
defer l.Close()
b := []byte("boo!")
n, err := l.Write(b)
isNil(err, t)
equals(len(b), n, t)
existsWithContent(filename, b, t)
}
func TestAutoRotate(t *testing.T) {
currentTime = fakeTime
megabyte = 1
dir := makeTempDir("TestAutoRotate", t)
defer os.RemoveAll(dir)
filename := logFile(dir)
l := &Logger{
Filename: filename,
MaxSize: 10,
}
defer l.Close()
b := []byte("boo!")
n, err := l.Write(b)
isNil(err, t)
equals(len(b), n, t)
existsWithContent(filename, b, t)
fileCount(dir, 1, t)
newFakeTime()
b2 := []byte("foooooo!")
n, err = l.Write(b2)
isNil(err, t)
equals(len(b2), n, t)
// the old logfile should be moved aside and the main logfile should have
// only the last write in it.
existsWithContent(filename, b2, t)
// the backup file will use the current fake time and have the old contents.
existsWithContent(backupFile(dir), b, t)
fileCount(dir, 2, t)
}
func TestFirstWriteRotate(t *testing.T) {
currentTime = fakeTime
megabyte = 1
dir := makeTempDir("TestFirstWriteRotate", t)
defer os.RemoveAll(dir)
filename := logFile(dir)
l := &Logger{
Filename: filename,
MaxSize: 10,
}
defer l.Close()
start := []byte("boooooo!")
err := ioutil.WriteFile(filename, start, 0600)
isNil(err, t)
newFakeTime()
// this would make us rotate
b := []byte("fooo!")
n, err := l.Write(b)
isNil(err, t)
equals(len(b), n, t)
existsWithContent(filename, b, t)
existsWithContent(backupFile(dir), start, t)
fileCount(dir, 2, t)
}
func TestMaxBackups(t *testing.T) {
currentTime = fakeTime
megabyte = 1
dir := makeTempDir("TestMaxBackups", t)
defer os.RemoveAll(dir)
filename := logFile(dir)
l := &Logger{
Filename: filename,
MaxSize: 10,
MaxBackups: 1,
}
defer l.Close()
b := []byte("boo!")
n, err := l.Write(b)
isNil(err, t)
equals(len(b), n, t)
existsWithContent(filename, b, t)
fileCount(dir, 1, t)
newFakeTime()
// this will put us over the max
b2 := []byte("foooooo!")
n, err = l.Write(b2)
isNil(err, t)
equals(len(b2), n, t)
// this will use the new fake time
secondFilename := backupFile(dir)
existsWithContent(secondFilename, b, t)
// make sure the old file still exists with the same content.
existsWithContent(filename, b2, t)
fileCount(dir, 2, t)
newFakeTime()
// this will make us rotate again
b3 := []byte("baaaaaar!")
n, err = l.Write(b3)
isNil(err, t)
equals(len(b3), n, t)
// this will use the new fake time
thirdFilename := backupFile(dir)
existsWithContent(thirdFilename, b2, t)
existsWithContent(filename, b3, t)
// we need to wait a little bit since the files get deleted on a different
// goroutine.
<-time.After(time.Millisecond * 10)
// should only have two files in the dir still
fileCount(dir, 2, t)
// second file name should still exist
existsWithContent(thirdFilename, b2, t)
// should have deleted the first backup
notExist(secondFilename, t)
// now test that we don't delete directories or non-logfile files
newFakeTime()
// create a file that is close to but different from the logfile name.
// It shouldn't get caught by our deletion filters.
notlogfile := logFile(dir) + ".foo"
err = ioutil.WriteFile(notlogfile, []byte("data"), 0644)
isNil(err, t)
// Make a directory that exactly matches our log file filters... it still
// shouldn't get caught by the deletion filter since it's a directory.
notlogfiledir := backupFile(dir)
err = os.Mkdir(notlogfiledir, 0700)
isNil(err, t)
newFakeTime()
// this will use the new fake time
fourthFilename := backupFile(dir)
// Create a log file that is/was being compressed - this should
// not be counted since both the compressed and the uncompressed
// log files still exist.
compLogFile := fourthFilename + compressSuffix
err = ioutil.WriteFile(compLogFile, []byte("compress"), 0644)
isNil(err, t)
// this will make us rotate again
b4 := []byte("baaaaaaz!")
n, err = l.Write(b4)
isNil(err, t)
equals(len(b4), n, t)
existsWithContent(fourthFilename, b3, t)
existsWithContent(fourthFilename+compressSuffix, []byte("compress"), t)
// we need to wait a little bit since the files get deleted on a different
// goroutine.
<-time.After(time.Millisecond * 10)
// We should have four things in the directory now - the 2 log files, the
// not log file, and the directory
fileCount(dir, 5, t)
// third file name should still exist
existsWithContent(filename, b4, t)
existsWithContent(fourthFilename, b3, t)
// should have deleted the first filename
notExist(thirdFilename, t)
// the not-a-logfile should still exist
exists(notlogfile, t)
// the directory
exists(notlogfiledir, t)
}
func TestCleanupExistingBackups(t *testing.T) {
// test that if we start with more backup files than we're supposed to have
// in total, that extra ones get cleaned up when we rotate.
currentTime = fakeTime
megabyte = 1
dir := makeTempDir("TestCleanupExistingBackups", t)
defer os.RemoveAll(dir)
// make 3 backup files
data := []byte("data")
backup := backupFile(dir)
err := ioutil.WriteFile(backup, data, 0644)
isNil(err, t)
newFakeTime()
backup = backupFile(dir)
err = ioutil.WriteFile(backup+compressSuffix, data, 0644)
isNil(err, t)
newFakeTime()
backup = backupFile(dir)
err = ioutil.WriteFile(backup, data, 0644)
isNil(err, t)
// now create a primary log file with some data
filename := logFile(dir)
err = ioutil.WriteFile(filename, data, 0644)
isNil(err, t)
l := &Logger{
Filename: filename,
MaxSize: 10,
MaxBackups: 1,
}
defer l.Close()
newFakeTime()
b2 := []byte("foooooo!")
n, err := l.Write(b2)
isNil(err, t)
equals(len(b2), n, t)
// we need to wait a little bit since the files get deleted on a different
// goroutine.
<-time.After(time.Millisecond * 10)
// now we should only have 2 files left - the primary and one backup
fileCount(dir, 2, t)
}
func TestMaxAge(t *testing.T) {
currentTime = fakeTime
megabyte = 1
dir := makeTempDir("TestMaxAge", t)
defer os.RemoveAll(dir)
filename := logFile(dir)
l := &Logger{
Filename: filename,
MaxSize: 10,
MaxAge: 1,
}
defer l.Close()
b := []byte("boo!")
n, err := l.Write(b)
isNil(err, t)
equals(len(b), n, t)
existsWithContent(filename, b, t)
fileCount(dir, 1, t)
// two days later
newFakeTime()
b2 := []byte("foooooo!")
n, err = l.Write(b2)
isNil(err, t)
equals(len(b2), n, t)
existsWithContent(backupFile(dir), b, t)
// we need to wait a little bit since the files get deleted on a different
// goroutine.
<-time.After(10 * time.Millisecond)
// We should still have 2 log files, since the most recent backup was just
// created.
fileCount(dir, 2, t)
existsWithContent(filename, b2, t)
// we should have deleted the old file due to being too old
existsWithContent(backupFile(dir), b, t)
// two days later
newFakeTime()
b3 := []byte("baaaaar!")
n, err = l.Write(b3)
isNil(err, t)
equals(len(b3), n, t)
existsWithContent(backupFile(dir), b2, t)
// we need to wait a little bit since the files get deleted on a different
// goroutine.
<-time.After(10 * time.Millisecond)
// We should have 2 log files - the main log file, and the most recent
// backup. The earlier backup is past the cutoff and should be gone.
fileCount(dir, 2, t)
existsWithContent(filename, b3, t)
// we should have deleted the old file due to being too old
existsWithContent(backupFile(dir), b2, t)
}
func TestOldLogFiles(t *testing.T) {
currentTime = fakeTime
megabyte = 1
dir := makeTempDir("TestOldLogFiles", t)
defer os.RemoveAll(dir)
filename := logFile(dir)
data := []byte("data")
err := ioutil.WriteFile(filename, data, 07)
isNil(err, t)
// This gives us a time with the same precision as the time we get from the
// timestamp in the name.
t1, err := time.Parse(DefaultTimeFormat, fakeTime().UTC().Format(DefaultTimeFormat))
isNil(err, t)
backup := backupFile(dir)
err = ioutil.WriteFile(backup, data, 07)
isNil(err, t)
newFakeTime()
t2, err := time.Parse(DefaultTimeFormat, fakeTime().UTC().Format(DefaultTimeFormat))
isNil(err, t)
backup2 := backupFile(dir)
err = ioutil.WriteFile(backup2, data, 07)
isNil(err, t)
l := &Logger{Filename: filename}
files, err := l.oldLogFiles()
isNil(err, t)
equals(2, len(files), t)
// should be sorted by newest file first, which would be t2
equals(t2, files[0].timestamp, t)
equals(t1, files[1].timestamp, t)
}
func TestTimeFromName(t *testing.T) {
l := &Logger{Filename: "/var/log/myfoo/foo.log"}
prefix, ext := l.prefixAndExt()
tests := []struct {
filename string
want time.Time
wantErr bool
}{
{"foo-2014-05-04T14-44-33.555.log", time.Date(2014, 5, 4, 14, 44, 33, 555000000, time.UTC), false},
{"foo-2014-05-04T14-44-33.555", time.Time{}, true},
{"2014-05-04T14-44-33.555.log", time.Time{}, true},
{"foo.log", time.Time{}, true},
}
for _, test := range tests {
got, err := l.timeFromName(test.filename, prefix, ext)
equals(got, test.want, t)
equals(err != nil, test.wantErr, t)
}
}
func TestLocalTime(t *testing.T) {
currentTime = fakeTime
megabyte = 1
dir := makeTempDir("TestLocalTime", t)
defer os.RemoveAll(dir)
l := &Logger{
Filename: logFile(dir),
MaxSize: 10,
LocalTime: true,
}
defer l.Close()
b := []byte("boo!")
n, err := l.Write(b)
isNil(err, t)
equals(len(b), n, t)
b2 := []byte("fooooooo!")
n2, err := l.Write(b2)
isNil(err, t)
equals(len(b2), n2, t)
existsWithContent(logFile(dir), b2, t)
existsWithContent(backupFileLocal(dir), b, t)
}
func TestRotate(t *testing.T) {
currentTime = fakeTime
dir := makeTempDir("TestRotate", t)
defer os.RemoveAll(dir)
filename := logFile(dir)
l := &Logger{
Filename: filename,
MaxBackups: 1,
MaxSize: 100, // megabytes
}
defer l.Close()
b := []byte("boo!")
n, err := l.Write(b)
isNil(err, t)
equals(len(b), n, t)
existsWithContent(filename, b, t)
fileCount(dir, 1, t)
newFakeTime()
err = l.Rotate()
isNil(err, t)
// we need to wait a little bit since the files get deleted on a different
// goroutine.
<-time.After(10 * time.Millisecond)
filename2 := backupFile(dir)
existsWithContent(filename2, b, t)
existsWithContent(filename, []byte{}, t)
fileCount(dir, 2, t)
newFakeTime()
err = l.Rotate()
isNil(err, t)
// we need to wait a little bit since the files get deleted on a different
// goroutine.
<-time.After(10 * time.Millisecond)
filename3 := backupFile(dir)
existsWithContent(filename3, []byte{}, t)
existsWithContent(filename, []byte{}, t)
fileCount(dir, 2, t)
b2 := []byte("foooooo!")
n, err = l.Write(b2)
isNil(err, t)
equals(len(b2), n, t)
// this will use the new fake time
existsWithContent(filename, b2, t)
}
func TestCompressOnRotate(t *testing.T) {
currentTime = fakeTime
megabyte = 1
dir := makeTempDir("TestCompressOnRotate", t)
defer os.RemoveAll(dir)
filename := logFile(dir)
l := &Logger{
Compress: true,
Filename: filename,
MaxSize: 10,
}
defer l.Close()
b := []byte("boo!")
n, err := l.Write(b)
isNil(err, t)
equals(len(b), n, t)
existsWithContent(filename, b, t)
fileCount(dir, 1, t)
newFakeTime()
err = l.Rotate()
isNil(err, t)
// the old logfile should be moved aside and the main logfile should have
// nothing in it.
existsWithContent(filename, []byte{}, t)
// we need to wait a little bit since the files get compressed on a different
// goroutine.
<-time.After(300 * time.Millisecond)
// a compressed version of the log file should now exist and the original
// should have been removed.
bc := new(bytes.Buffer)
gz := gzip.NewWriter(bc)
_, err = gz.Write(b)
isNil(err, t)
err = gz.Close()
isNil(err, t)
existsWithContent(backupFile(dir)+compressSuffix, bc.Bytes(), t)
notExist(backupFile(dir), t)
fileCount(dir, 2, t)
}
func TestCompressOnResume(t *testing.T) {
currentTime = fakeTime
megabyte = 1
dir := makeTempDir("TestCompressOnResume", t)
defer os.RemoveAll(dir)
filename := logFile(dir)
l := &Logger{
Compress: true,
Filename: filename,
MaxSize: 10,
}
defer l.Close()
// Create a backup file and empty "compressed" file.
filename2 := backupFile(dir)
b := []byte("foo!")
err := ioutil.WriteFile(filename2, b, 0644)
isNil(err, t)
err = ioutil.WriteFile(filename2+compressSuffix, []byte{}, 0644)
isNil(err, t)
newFakeTime()
b2 := []byte("boo!")
n, err := l.Write(b2)
isNil(err, t)
equals(len(b2), n, t)
existsWithContent(filename, b2, t)
// we need to wait a little bit since the files get compressed on a different
// goroutine.
<-time.After(300 * time.Millisecond)
// The write should have started the compression - a compressed version of
// the log file should now exist and the original should have been removed.
bc := new(bytes.Buffer)
gz := gzip.NewWriter(bc)
_, err = gz.Write(b)
isNil(err, t)
err = gz.Close()
isNil(err, t)
existsWithContent(filename2+compressSuffix, bc.Bytes(), t)
notExist(filename2, t)
fileCount(dir, 2, t)
}
func TestJson(t *testing.T) {
data := []byte(`
{
"filename": "foo",
"maxsize": 5,
"maxage": 10,
"maxbackups": 3,
"localtime": true,
"compress": true
}`[1:])
l := Logger{}
err := json.Unmarshal(data, &l)
isNil(err, t)
equals("foo", l.Filename, t)
equals(5, l.MaxSize, t)
equals(10, l.MaxAge, t)
equals(3, l.MaxBackups, t)
equals(true, l.LocalTime, t)
equals(true, l.Compress, t)
}
// makeTempDir creates a file with a semi-unique name in the OS temp directory.
// It should be based on the name of the test, to keep parallel tests from
// colliding, and must be cleaned up after the test is finished.
func makeTempDir(name string, t testing.TB) string {
dir := time.Now().Format(name + DefaultTimeFormat)
dir = filepath.Join(os.TempDir(), dir)
isNilUp(os.Mkdir(dir, 0700), t, 1)
return dir
}
// existsWithContent checks that the given file exists and has the correct content.
func existsWithContent(path string, content []byte, t testing.TB) {
info, err := os.Stat(path)
isNilUp(err, t, 1)
equalsUp(int64(len(content)), info.Size(), t, 1)
b, err := ioutil.ReadFile(path)
isNilUp(err, t, 1)
equalsUp(content, b, t, 1)
}
// logFile returns the log file name in the given directory for the current fake
// time.
func logFile(dir string) string {
return filepath.Join(dir, "foobar.log")
}
func backupFile(dir string) string {
return filepath.Join(dir, "foobar-"+fakeTime().UTC().Format(DefaultTimeFormat)+".log")
}
func backupFileLocal(dir string) string {
return filepath.Join(dir, "foobar-"+fakeTime().Format(DefaultTimeFormat)+".log")
}
// logFileLocal returns the log file name in the given directory for the current
// fake time using the local timezone.
func logFileLocal(dir string) string {
return filepath.Join(dir, fakeTime().Format(DefaultTimeFormat))
}
// fileCount checks that the number of files in the directory is exp.
func fileCount(dir string, exp int, t testing.TB) {
files, err := ioutil.ReadDir(dir)
isNilUp(err, t, 1)
// Make sure no other files were created.
equalsUp(exp, len(files), t, 1)
}
// newFakeTime sets the fake "current time" to two days later.
func newFakeTime() {
fakeCurrentTime = fakeCurrentTime.Add(time.Hour * 24 * 2)
}
func notExist(path string, t testing.TB) {
_, err := os.Stat(path)
assertUp(os.IsNotExist(err), t, 1, "expected to get os.IsNotExist, but instead got %v", err)
}
func exists(path string, t testing.TB) {
_, err := os.Stat(path)
assertUp(err == nil, t, 1, "expected file to exist, but got error from os.Stat: %v", err)
}