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minio/cmd/namespace-lock_test.go

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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 cmd
import (
"strconv"
"sync"
"testing"
"time"
)
// Tests functionality provided by namespace lock.
func TestNamespaceLockTest(t *testing.T) {
// List of test cases.
testCases := []struct {
lk func(s1, s2, s3 string)
unlk func(s1, s2, s3 string)
rlk func(s1, s2, s3 string)
runlk func(s1, s2, s3 string)
lkCount int
lockedRefCount uint
unlockedRefCount uint
shouldPass bool
}{
{
lk: nsMutex.Lock,
unlk: nsMutex.Unlock,
lockedRefCount: 1,
unlockedRefCount: 0,
shouldPass: true,
},
{
rlk: nsMutex.RLock,
runlk: nsMutex.RUnlock,
lockedRefCount: 4,
unlockedRefCount: 2,
shouldPass: true,
},
{
rlk: nsMutex.RLock,
runlk: nsMutex.RUnlock,
lockedRefCount: 1,
unlockedRefCount: 0,
shouldPass: true,
},
}
// Run all test cases.
// Write lock tests.
testCase := testCases[0]
testCase.lk("a", "b", "c") // lock once.
nsLk, ok := nsMutex.lockMap[nsParam{"a", "b"}]
if !ok && testCase.shouldPass {
t.Errorf("Lock in map missing.")
}
// Validate locked ref count.
if testCase.lockedRefCount != nsLk.ref && testCase.shouldPass {
t.Errorf("Test %d fails, expected to pass. Wanted ref count is %d, got %d", 1, testCase.lockedRefCount, nsLk.ref)
}
testCase.unlk("a", "b", "c") // unlock once.
if testCase.unlockedRefCount != nsLk.ref && testCase.shouldPass {
t.Errorf("Test %d fails, expected to pass. Wanted ref count is %d, got %d", 1, testCase.unlockedRefCount, nsLk.ref)
}
_, ok = nsMutex.lockMap[nsParam{"a", "b"}]
if ok && !testCase.shouldPass {
t.Errorf("Lock map found after unlock.")
}
// Read lock tests.
testCase = testCases[1]
testCase.rlk("a", "b", "c") // lock once.
testCase.rlk("a", "b", "c") // lock second time.
testCase.rlk("a", "b", "c") // lock third time.
testCase.rlk("a", "b", "c") // lock fourth time.
nsLk, ok = nsMutex.lockMap[nsParam{"a", "b"}]
if !ok && testCase.shouldPass {
t.Errorf("Lock in map missing.")
}
// Validate locked ref count.
if testCase.lockedRefCount != nsLk.ref && testCase.shouldPass {
t.Errorf("Test %d fails, expected to pass. Wanted ref count is %d, got %d", 1, testCase.lockedRefCount, nsLk.ref)
}
testCase.runlk("a", "b", "c") // unlock once.
testCase.runlk("a", "b", "c") // unlock second time.
if testCase.unlockedRefCount != nsLk.ref && testCase.shouldPass {
t.Errorf("Test %d fails, expected to pass. Wanted ref count is %d, got %d", 2, testCase.unlockedRefCount, nsLk.ref)
}
_, ok = nsMutex.lockMap[nsParam{"a", "b"}]
if !ok && testCase.shouldPass {
t.Errorf("Lock map not found.")
}
// Read lock 0 ref count.
testCase = testCases[2]
testCase.rlk("a", "c", "d") // lock once.
nsLk, ok = nsMutex.lockMap[nsParam{"a", "c"}]
if !ok && testCase.shouldPass {
t.Errorf("Lock in map missing.")
}
// Validate locked ref count.
if testCase.lockedRefCount != nsLk.ref && testCase.shouldPass {
t.Errorf("Test %d fails, expected to pass. Wanted ref count is %d, got %d", 3, testCase.lockedRefCount, nsLk.ref)
}
testCase.runlk("a", "c", "d") // unlock once.
if testCase.unlockedRefCount != nsLk.ref && testCase.shouldPass {
t.Errorf("Test %d fails, expected to pass. Wanted ref count is %d, got %d", 3, testCase.unlockedRefCount, nsLk.ref)
}
_, ok = nsMutex.lockMap[nsParam{"a", "c"}]
if ok && !testCase.shouldPass {
t.Errorf("Lock map not found.")
}
}
func TestLockStats(t *testing.T) {
expectedResult := []lockStateCase{
// Test case - 1.
// Case where 10 read locks are held.
// Entry for any of the 10 reads locks has to be found.
// Since they held in a loop, Lock origin for first 10 read locks (opsID 0-9) should be the same.
{
volume: "my-bucket",
path: "my-object",
opsID: "0",
readLock: true,
lockSource: "[lock held] in github.com/minio/minio/cmd.TestLockStats[/Users/hackintoshrao/mycode/go/src/github.com/minio/minio/cmd/namespace-lock_test.go:298]",
// expected metrics.
expectedErr: nil,
expectedLockStatus: "Running",
expectedGlobalLockCount: 10,
expectedRunningLockCount: 10,
expectedBlockedLockCount: 0,
expectedVolPathLockCount: 10,
expectedVolPathRunningCount: 10,
expectedVolPathBlockCount: 0,
},
// Test case - 2.
// Case where the first 5 read locks are released.
// Entry for any of the 6-10th "Running" reads lock has to be found.
{
volume: "my-bucket",
path: "my-object",
opsID: "6",
readLock: true,
lockSource: "[lock held] in github.com/minio/minio/cmd.TestLockStats[/Users/hackintoshrao/mycode/go/src/github.com/minio/minio/cmd/namespace-lock_test.go:298]",
// expected metrics.
expectedErr: nil,
expectedLockStatus: "Running",
expectedGlobalLockCount: 5,
expectedRunningLockCount: 5,
expectedBlockedLockCount: 0,
expectedVolPathLockCount: 5,
expectedVolPathRunningCount: 5,
expectedVolPathBlockCount: 0,
},
// Test case - 3.
{
volume: "my-bucket",
path: "my-object",
opsID: "10",
readLock: false,
lockSource: "[lock held] in github.com/minio/minio/cmd.TestLockStats[/Users/hackintoshrao/mycode/go/src/github.com/minio/minio/cmd/namespace-lock_test.go:298]",
// expected metrics.
expectedErr: nil,
expectedLockStatus: "Running",
expectedGlobalLockCount: 2,
expectedRunningLockCount: 1,
expectedBlockedLockCount: 1,
expectedVolPathLockCount: 2,
expectedVolPathRunningCount: 1,
expectedVolPathBlockCount: 1,
},
// Test case - 4.
{
volume: "my-bucket",
path: "my-object",
// expected metrics.
expectedErr: nil,
expectedLockStatus: "Blocked",
expectedGlobalLockCount: 1,
expectedRunningLockCount: 0,
expectedBlockedLockCount: 1,
expectedVolPathLockCount: 1,
expectedVolPathRunningCount: 0,
expectedVolPathBlockCount: 1,
},
// Test case - 5.
{
volume: "my-bucket",
path: "my-object",
opsID: "11",
readLock: false,
lockSource: "[lock held] in github.com/minio/minio/cmd.TestLockStats[/Users/hackintoshrao/mycode/go/src/github.com/minio/minio/cmd/namespace-lock_test.go:298]",
// expected metrics.
expectedErr: nil,
expectedLockStatus: "Running",
expectedGlobalLockCount: 1,
expectedRunningLockCount: 1,
expectedBlockedLockCount: 0,
expectedVolPathLockCount: 1,
expectedVolPathRunningCount: 1,
expectedVolPathBlockCount: 0,
},
// Test case - 6.
// Case where in the first 5 read locks are released, but 2 write locks are
// blocked waiting for the remaining 5 read locks locks to be released (10 read locks were held initially).
// We check the entry for the first blocked write call here.
{
volume: "my-bucket",
path: "my-object",
opsID: "10",
readLock: false,
// write lock is held at line 318.
// this confirms that we are looking the right write lock.
lockSource: "[lock held] in github.com/minio/minio/cmd.TestLockStats.func2[/Users/hackintoshrao/mycode/go/src/github.com/minio/minio/cmd/namespace-lock_test.go:318]",
// expected metrics.
expectedErr: nil,
expectedLockStatus: "Blocked",
// count of held(running) + blocked locks.
expectedGlobalLockCount: 7,
// count of acquired locks.
expectedRunningLockCount: 5,
// 2 write calls are blocked, waiting for the remaining 5 read locks.
expectedBlockedLockCount: 2,
expectedVolPathLockCount: 7,
expectedVolPathRunningCount: 5,
expectedVolPathBlockCount: 2,
},
// Test case - 7.
// Case where in 9 out of 10 read locks are released.
// Since there's one more pending read lock, the 2 write locks are still blocked.
// Testing the entry for the last read lock.
{volume: "my-bucket",
path: "my-object",
opsID: "9",
readLock: true,
lockSource: "[lock held] in github.com/minio/minio/cmd.TestLockStats.func2[/Users/hackintoshrao/mycode/go/src/github.com/minio/minio/cmd/namespace-lock_test.go:318]",
// expected metrics.
expectedErr: nil,
expectedLockStatus: "Running",
// Total running + blocked locks.
// 2 blocked write lock.
expectedGlobalLockCount: 3,
expectedRunningLockCount: 1,
expectedBlockedLockCount: 2,
expectedVolPathLockCount: 3,
expectedVolPathRunningCount: 1,
expectedVolPathBlockCount: 2,
},
// Test case - 8.
{
volume: "my-bucket",
path: "my-object",
// expected metrics.
expectedErr: nil,
expectedLockStatus: "Blocked",
expectedGlobalLockCount: 0,
expectedRunningLockCount: 0,
expectedBlockedLockCount: 0,
},
}
var wg sync.WaitGroup
// initializing the locks.
initNSLock(false)
// hold 10 read locks.
for i := 0; i < 10; i++ {
nsMutex.RLock("my-bucket", "my-object", strconv.Itoa(i))
}
// expected lock info.
expectedLockStats := expectedResult[0]
// verify the actual lock info with the expected one.
verifyLockState(expectedLockStats, t, 1)
// unlock 5 readlock.
for i := 0; i < 5; i++ {
nsMutex.RUnlock("my-bucket", "my-object", strconv.Itoa(i))
}
expectedLockStats = expectedResult[1]
// verify the actual lock info with the expected one.
verifyLockState(expectedLockStats, t, 2)
syncChan := make(chan struct{}, 1)
wg.Add(1)
go func() {
defer wg.Done()
// blocks till all read locks are released.
nsMutex.Lock("my-bucket", "my-object", strconv.Itoa(10))
// Once the above attempt to lock is unblocked/acquired, we verify the stats and release the lock.
expectedWLockStats := expectedResult[2]
// Since the write lock acquired here, the number of blocked locks should reduce by 1 and
// count of running locks should increase by 1.
verifyLockState(expectedWLockStats, t, 3)
// release the write lock.
nsMutex.Unlock("my-bucket", "my-object", strconv.Itoa(10))
// The number of running locks should decrease by 1.
// expectedWLockStats = expectedResult[3]
// verifyLockState(expectedWLockStats, t, 4)
// Take the lock stats after the first write lock is unlocked.
// Only then unlock then second write lock.
syncChan <- struct{}{}
}()
// waiting so that the write locks in the above go routines are held.
// sleeping so that we can predict the order of the write locks held.
time.Sleep(100 * time.Millisecond)
// since there are 5 more readlocks still held on <"my-bucket","my-object">,
// an attempt to hold write locks blocks. So its run in a new go routine.
wg.Add(1)
go func() {
defer wg.Done()
// blocks till all read locks are released.
nsMutex.Lock("my-bucket", "my-object", strconv.Itoa(11))
// Once the above attempt to lock is unblocked/acquired, we release the lock.
// Unlock the second write lock only after lock stats for first write lock release is taken.
<-syncChan
// The number of running locks should decrease by 1.
expectedWLockStats := expectedResult[4]
verifyLockState(expectedWLockStats, t, 5)
nsMutex.Unlock("my-bucket", "my-object", strconv.Itoa(11))
}()
expectedLockStats = expectedResult[5]
time.Sleep(1 * time.Second)
// verify the actual lock info with the expected one.
verifyLockState(expectedLockStats, t, 6)
// unlock 4 out of remaining 5 read locks.
for i := 0; i < 4; i++ {
nsMutex.RUnlock("my-bucket", "my-object", strconv.Itoa(i+5))
}
// verify the entry for one remaining read lock and count of blocked write locks.
expectedLockStats = expectedResult[6]
// verify the actual lock info with the expected one.
verifyLockState(expectedLockStats, t, 7)
// Releasing the last read lock.
nsMutex.RUnlock("my-bucket", "my-object", strconv.Itoa(9))
wg.Wait()
expectedLockStats = expectedResult[7]
// verify the actual lock info with the expected one.
verifyGlobalLockStats(expectedLockStats, t, 8)
}
// Tests functionality to forcefully unlock locks.
func TestNamespaceForceUnlockTest(t *testing.T) {
// Create lock.
lock := nsMutex.NewNSLock("bucket", "object")
lock.Lock()
// Forcefully unlock lock.
nsMutex.ForceUnlock("bucket", "object")
ch := make(chan struct{}, 1)
go func() {
// Try to claim lock again.
anotherLock := nsMutex.NewNSLock("bucket", "object")
anotherLock.Lock()
// And signal succes.
ch <- struct{}{}
}()
select {
case <-ch:
// Signalled so all is fine.
break
case <-time.After(100 * time.Millisecond):
// In case we hit the time out, the lock has not been cleared.
t.Errorf("Lock not cleared.")
}
// Clean up lock.
nsMutex.ForceUnlock("bucket", "object")
}