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// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package globallock
import (
"context"
"os"
"sync"
"testing"
"time"
"github.com/go-redsync/redsync/v4"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestLocker(t *testing.T) {
t.Run("redis", func(t *testing.T) {
url := "redis://127.0.0.1:6379/0"
if os.Getenv("CI") == "" {
// Make it possible to run tests against a local redis instance
url = os.Getenv("TEST_REDIS_URL")
if url == "" {
t.Skip("TEST_REDIS_URL not set and not running in CI")
return
}
}
oldExpiry := redisLockExpiry
redisLockExpiry = 5 * time.Second // make it shorter for testing
defer func() {
redisLockExpiry = oldExpiry
}()
locker := NewRedisLocker(url)
testLocker(t, locker)
testRedisLocker(t, locker.(*redisLocker))
require.NoError(t, locker.(*redisLocker).Close())
})
t.Run("memory", func(t *testing.T) {
locker := NewMemoryLocker()
testLocker(t, locker)
testMemoryLocker(t, locker.(*memoryLocker))
})
}
func testLocker(t *testing.T, locker Locker) {
t.Run("lock", func(t *testing.T) {
parentCtx := context.Background()
ctx, release, err := locker.Lock(parentCtx, "test")
defer release()
assert.NotEqual(t, parentCtx, ctx) // new context should be returned
assert.NoError(t, err)
func() {
parentCtx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
ctx, release, err := locker.Lock(parentCtx, "test")
defer release()
assert.Error(t, err)
assert.Equal(t, parentCtx, ctx) // should return the same context
}()
release()
assert.Error(t, ctx.Err())
func() {
_, release, err := locker.Lock(context.Background(), "test")
defer release()
assert.NoError(t, err)
}()
})
t.Run("try lock", func(t *testing.T) {
parentCtx := context.Background()
ok, ctx, release, err := locker.TryLock(parentCtx, "test")
defer release()
assert.True(t, ok)
assert.NotEqual(t, parentCtx, ctx) // new context should be returned
assert.NoError(t, err)
func() {
parentCtx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
ok, ctx, release, err := locker.TryLock(parentCtx, "test")
defer release()
assert.False(t, ok)
assert.NoError(t, err)
assert.Equal(t, parentCtx, ctx) // should return the same context
}()
release()
assert.Error(t, ctx.Err())
func() {
ok, _, release, _ := locker.TryLock(context.Background(), "test")
defer release()
assert.True(t, ok)
}()
})
t.Run("wait and acquired", func(t *testing.T) {
ctx := context.Background()
_, release, err := locker.Lock(ctx, "test")
require.NoError(t, err)
wg := &sync.WaitGroup{}
wg.Add(1)
go func() {
defer wg.Done()
started := time.Now()
_, release, err := locker.Lock(context.Background(), "test") // should be blocked for seconds
defer release()
assert.Greater(t, time.Since(started), time.Second)
assert.NoError(t, err)
}()
time.Sleep(2 * time.Second)
release()
wg.Wait()
})
t.Run("continue after release", func(t *testing.T) {
ctx := context.Background()
ctxBeforeLock := ctx
ctx, release, err := locker.Lock(ctx, "test")
require.NoError(t, err)
assert.NoError(t, ctx.Err())
assert.NotEqual(t, ctxBeforeLock, ctx)
ctxBeforeRelease := ctx
ctx = release()
assert.NoError(t, ctx.Err())
assert.Error(t, ctxBeforeRelease.Err())
// so it can continue with ctx to do more work
})
t.Run("multiple release", func(t *testing.T) {
ctx := context.Background()
_, release1, err := locker.Lock(ctx, "test")
require.NoError(t, err)
release1()
_, release2, err := locker.Lock(ctx, "test")
defer release2()
require.NoError(t, err)
// Call release1 again,
// it should not panic or block,
// and it shouldn't affect the other lock
release1()
ok, _, release3, err := locker.TryLock(ctx, "test")
defer release3()
require.NoError(t, err)
// It should be able to acquire the lock;
// otherwise, it means the lock has been released by release1
assert.False(t, ok)
})
}
// testMemoryLocker does specific tests for memoryLocker
func testMemoryLocker(t *testing.T, locker *memoryLocker) {
// nothing to do
}
// testRedisLocker does specific tests for redisLocker
func testRedisLocker(t *testing.T, locker *redisLocker) {
defer func() {
// This case should be tested at the end.
// Otherwise, it will affect other tests.
t.Run("close", func(t *testing.T) {
assert.NoError(t, locker.Close())
_, _, err := locker.Lock(context.Background(), "test")
assert.Error(t, err)
})
}()
t.Run("failed extend", func(t *testing.T) {
ctx, release, err := locker.Lock(context.Background(), "test")
defer release()
require.NoError(t, err)
// It simulates that there are some problems with extending like network issues or redis server down.
v, ok := locker.mutexM.Load("test")
require.True(t, ok)
m := v.(*redisMutex)
_, _ = m.mutex.Unlock() // release it to make it impossible to extend
select {
case <-time.After(redisLockExpiry + time.Second):
t.Errorf("lock should be expired")
case <-ctx.Done():
var errTaken *redsync.ErrTaken
assert.ErrorAs(t, context.Cause(ctx), &errTaken)
}
})
}
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