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Copy pathlock_test.go
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191 lines (167 loc) · 3.62 KB
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/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package lock
import (
"io/ioutil"
"os"
"testing"
"time"
)
// Test lock fails.
func TestLockFail(t *testing.T) {
f, err := ioutil.TempFile("", "lock")
if err != nil {
t.Fatal(err)
}
f.Close()
defer func() {
err = os.Remove(f.Name())
if err != nil {
t.Fatal(err)
}
}()
_, err = LockedOpenFile(f.Name(), os.O_APPEND, 0600)
if err == nil {
t.Fatal("Should fail here")
}
}
// Tests lock directory fail.
func TestLockDirFail(t *testing.T) {
d, err := ioutil.TempDir("", "lockDir")
if err != nil {
t.Fatal(err)
}
defer func() {
err = os.Remove(d)
t.Fatal(err)
}
}()
_, err = LockedOpenFile(d, os.O_APPEND, 0600)
if err == nil {
t.Fatal("Should fail here")
}
}
// Tests rwlock methods.
func TestRWLockedFile(t *testing.T) {
f, err := ioutil.TempFile("", "lock")
if err != nil {
t.Fatal(err)
}
f.Close()
defer func() {
err = os.Remove(f.Name())
if err != nil {
t.Fatal(err)
}
}()
rlk, err := RLockedOpenFile(f.Name())
if err != nil {
t.Fatal(err)
}
isClosed := rlk.IsClosed()
if isClosed {
t.Fatal("File ref count shouldn't be zero")
}
// Increase reference count to 2.
rlk.IncLockRef()
isClosed = rlk.IsClosed()
if isClosed {
t.Fatal("File ref count shouldn't be zero")
}
// Decrease reference count by 1.
if err = rlk.Close(); err != nil {
t.Fatal(err)
}
isClosed = rlk.IsClosed()
if isClosed {
t.Fatal("File ref count shouldn't be zero")
}
// Decrease reference count by 1.
if err = rlk.Close(); err != nil {
t.Fatal(err)
}
// Now file should be closed.
isClosed = rlk.IsClosed()
if !isClosed {
t.Fatal("File ref count should be zero")
}
// Closing a file again should result in invalid argument.
if err = rlk.Close(); err != os.ErrInvalid {
t.Fatal(err)
}
_, err = newRLockedFile(nil)
if err != os.ErrInvalid {
t.Fatal("Unexpected error", err)
}
}
// Tests lock and unlock semantics.
func TestLockAndUnlock(t *testing.T) {
f, err := ioutil.TempFile("", "lock")
if err != nil {
t.Fatal(err)
}
f.Close()
defer func() {
err = os.Remove(f.Name())
if err != nil {
t.Fatal(err)
}
}()
// lock the file
l, err := LockedOpenFile(f.Name(), os.O_WRONLY, 0600)
if err != nil {
t.Fatal(err)
}
// unlock the file
if err = l.Close(); err != nil {
t.Fatal(err)
}
// try lock the unlocked file
dupl, err := LockedOpenFile(f.Name(), os.O_WRONLY|os.O_CREATE, 0600)
if err != nil {
t.Errorf("err = %v, want %v", err, nil)
}
// blocking on locked file
locked := make(chan struct{}, 1)
go func() {
bl, blerr := LockedOpenFile(f.Name(), os.O_WRONLY, 0600)
if blerr != nil {
t.Error(blerr)
return
}
locked <- struct{}{}
if blerr = bl.Close(); blerr != nil {
t.Error(blerr)
return
}
}()
select {
case <-locked:
t.Error("unexpected unblocking")
case <-time.After(100 * time.Millisecond):
}
// unlock
if err = dupl.Close(); err != nil {
t.Fatal(err)
}
// the previously blocked routine should be unblocked
select {
case <-locked:
case <-time.After(1 * time.Second):
t.Error("unexpected blocking")
}
}