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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2014-2015 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package priv
import (
"launchpad.net/snappy/helpers"
"path/filepath"
"testing"
"time"
. "gopkg.in/check.v1"
)
func Test(t *testing.T) { TestingT(t) }
type PrivTestSuite struct {
}
var _ = Suite(&PrivTestSuite{})
func mockIsRoot() bool {
return true
}
func (ts *PrivTestSuite) SetUpTest(c *C) {
isRoot = mockIsRoot
dir := c.MkDir()
lockfileName = func() string {
return filepath.Join(dir, "lock")
}
}
func (ts *PrivTestSuite) TestPrivMutex(c *C) {
lockfile := lockfileName()
c.Assert(helpers.FileExists(lockfile), Equals, false)
privMutex := New()
c.Assert(privMutex, Not(IsNil))
c.Assert(privMutex.lock, IsNil)
c.Assert(helpers.FileExists(lockfile), Equals, false)
err := privMutex.Unlock()
c.Assert(err, DeepEquals, ErrNotLocked)
c.Assert(helpers.FileExists(lockfile), Equals, false)
err = privMutex.Lock()
c.Assert(err, IsNil)
c.Assert(privMutex.lock, Not(IsNil))
c.Assert(helpers.FileExists(lockfile), Equals, true)
// Can't call Lock() again as it's blocking
err = privMutex.TryLock()
c.Assert(err, DeepEquals, ErrAlreadyLocked)
c.Assert(privMutex.lock, Not(IsNil))
c.Assert(helpers.FileExists(lockfile), Equals, true)
err = privMutex.Unlock()
c.Assert(err, IsNil)
c.Assert(privMutex.lock, IsNil)
c.Assert(helpers.FileExists(lockfile), Equals, false)
}
func (ts *PrivTestSuite) TestPrivMutexIsNotRoot(c *C) {
lockfile := lockfileName()
isRoot = func() bool {
return false
}
c.Assert(helpers.FileExists(lockfile), Equals, false)
privMutex := New()
c.Assert(privMutex, Not(IsNil))
c.Assert(privMutex.Lock(), DeepEquals, ErrNeedRoot)
c.Assert(privMutex.TryLock(), DeepEquals, ErrNeedRoot)
c.Assert(privMutex.Unlock(), DeepEquals, ErrNeedRoot)
}
func (ts *PrivTestSuite) TestWithPrivMutexSimple(c *C) {
called := false
err := WithMutex(func() error {
called = true
return nil
})
c.Assert(err, IsNil)
c.Assert(called, Equals, true)
}
func (ts *PrivTestSuite) TestWithPrivMutexErrOnLockHeld(c *C) {
var err, err1, err2 error
var callCount int
slowFunc := func() error {
time.Sleep(time.Millisecond * 100)
callCount++
return nil
}
go func() {
err1 = WithMutex(slowFunc)
}()
err2 = WithMutex(slowFunc)
// find which err is set (depends on the order in which go
// runs the goroutine)
if err1 != nil {
err = err1
} else {
err = err2
}
// only one functions errored
c.Assert(err1 != nil && err2 != nil, Equals, false)
// the other returned a proper error
c.Assert(err, Equals, ErrAlreadyLocked)
// and we did not call it too often
c.Assert(callCount, Equals, 1)
}
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