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pgsql: Move lock to lock module

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master
Sida Chen 5 years ago
parent 0b32b36cf7
commit ba50d7c626
3 changed files with 118 additions and 114 deletions
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33
database/pgsql/lock.go → database/pgsql/lock/lock.go
Unescape View File

@ -12,11 +12,14 @@
// See the License for the specific language governing permissions and
// limitations under the License.
package pgsql
package lock
import (
"database/sql"
"time"
"github.com/coreos/clair/database/pgsql/monitoring"
"github.com/coreos/clair/database/pgsql/util"
log "github.com/sirupsen/logrus"
)
@ -38,12 +41,12 @@ const (
SELECT owner, until FROM lock WHERE name = $1`
)
func (tx *pgSession) AcquireLock(lockName, whoami string, desiredDuration time.Duration) (bool, time.Time, error) {
func AcquireLock(tx *sql.Tx, lockName, whoami string, desiredDuration time.Duration) (bool, time.Time, error) {
if lockName == "" || whoami == "" || desiredDuration == 0 {
panic("invalid lock parameters")
}
if err := tx.pruneLocks(); err != nil {
if err := PruneLocks(tx); err != nil {
return false, time.Time{}, err
}
@ -54,22 +57,22 @@ func (tx *pgSession) AcquireLock(lockName, whoami string, desiredDuration time.D
lockOwner string
)
defer observeQueryTime("Lock", "soiLock", time.Now())
defer monitoring.ObserveQueryTime("Lock", "soiLock", time.Now())
err := tx.QueryRow(soiLock, lockName, whoami, desiredLockedUntil).Scan(&lockOwner, &lockedUntil)
return lockOwner == whoami, lockedUntil, err
return lockOwner == whoami, lockedUntil, util.HandleError("AcquireLock", err)
}
func (tx *pgSession) ExtendLock(lockName, whoami string, desiredDuration time.Duration) (bool, time.Time, error) {
func ExtendLock(tx *sql.Tx, lockName, whoami string, desiredDuration time.Duration) (bool, time.Time, error) {
if lockName == "" || whoami == "" || desiredDuration == 0 {
panic("invalid lock parameters")
}
desiredLockedUntil := time.Now().Add(desiredDuration)
defer observeQueryTime("Lock", "update", time.Now())
defer monitoring.ObserveQueryTime("Lock", "update", time.Now())
result, err := tx.Exec(updateLock, lockName, whoami, desiredLockedUntil)
if err != nil {
return false, time.Time{}, handleError("updateLock", err)
return false, time.Time{}, util.HandleError("updateLock", err)
}
if numRows, err := result.RowsAffected(); err == nil {
@ -77,27 +80,27 @@ func (tx *pgSession) ExtendLock(lockName, whoami string, desiredDuration time.Du
return numRows > 0, desiredLockedUntil, nil
}
return false, time.Time{}, handleError("updateLock", err)
return false, time.Time{}, util.HandleError("updateLock", err)
}
func (tx *pgSession) ReleaseLock(name, owner string) error {
func ReleaseLock(tx *sql.Tx, name, owner string) error {
if name == "" || owner == "" {
panic("invalid lock parameters")
}
defer observeQueryTime("Unlock", "all", time.Now())
defer monitoring.ObserveQueryTime("Unlock", "all", time.Now())
_, err := tx.Exec(removeLock, name, owner)
return err
}
// pruneLocks removes every expired locks from the database
func (tx *pgSession) pruneLocks() error {
defer observeQueryTime("pruneLocks", "all", time.Now())
func PruneLocks(tx *sql.Tx) error {
defer monitoring.ObserveQueryTime("pruneLocks", "all", time.Now())
if r, err := tx.Exec(removeLockExpired, time.Now().UTC()); err != nil {
return handleError("removeLockExpired", err)
return util.HandleError("removeLockExpired", err)
} else if affected, err := r.RowsAffected(); err != nil {
return handleError("removeLockExpired", err)
return util.HandleError("removeLockExpired", err)
} else {
log.Debugf("Pruned %d Locks", affected)
}

100
database/pgsql/lock/lock_test.go
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@ -0,0 +1,100 @@
// Copyright 2019 clair authors
//
// 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 (
"testing"
"time"
"github.com/coreos/clair/database/pgsql/testutil"
"github.com/stretchr/testify/require"
)
func TestAcquireLockReturnsExistingLockDuration(t *testing.T) {
tx, cleanup := testutil.CreateTestTxWithFixtures(t, "Lock")
defer cleanup()
acquired, originalExpiration, err := AcquireLock(tx, "test1", "owner1", time.Minute)
require.Nil(t, err)
require.True(t, acquired)
acquired2, expiration, err := AcquireLock(tx, "test1", "owner2", time.Hour)
require.Nil(t, err)
require.False(t, acquired2)
require.Equal(t, expiration, originalExpiration)
}
func TestLock(t *testing.T) {
db, cleanup := testutil.CreateTestDBWithFixture(t, "Lock")
defer cleanup()
tx, err := db.Begin()
if err != nil {
panic(err)
}
// Create a first lock.
l, _, err := AcquireLock(tx, "test1", "owner1", time.Minute)
require.Nil(t, err)
require.True(t, l)
tx = testutil.RestartTransaction(db, tx, true)
// lock again by itself, the previous lock is not expired yet.
l, _, err = AcquireLock(tx, "test1", "owner1", time.Minute)
require.Nil(t, err)
require.True(t, l)
tx = testutil.RestartTransaction(db, tx, false)
// Try to renew the same lock with another owner.
l, _, err = ExtendLock(tx, "test1", "owner2", time.Minute)
require.Nil(t, err)
require.False(t, l)
tx = testutil.RestartTransaction(db, tx, false)
l, _, err = AcquireLock(tx, "test1", "owner2", time.Minute)
require.Nil(t, err)
require.False(t, l)
tx = testutil.RestartTransaction(db, tx, false)
// Renew the lock.
l, _, err = ExtendLock(tx, "test1", "owner1", 2*time.Minute)
require.Nil(t, err)
require.True(t, l)
tx = testutil.RestartTransaction(db, tx, true)
// Unlock and then relock by someone else.
err = ReleaseLock(tx, "test1", "owner1")
require.Nil(t, err)
tx = testutil.RestartTransaction(db, tx, true)
l, _, err = AcquireLock(tx, "test1", "owner2", time.Minute)
require.Nil(t, err)
require.True(t, l)
tx = testutil.RestartTransaction(db, tx, true)
// Create a second lock which is actually already expired ...
l, _, err = AcquireLock(tx, "test2", "owner1", -time.Minute)
require.Nil(t, err)
require.True(t, l)
tx = testutil.RestartTransaction(db, tx, true)
// Take over the lock
l, _, err = AcquireLock(tx, "test2", "owner2", time.Minute)
require.Nil(t, err)
require.True(t, l)
tx = testutil.RestartTransaction(db, tx, true)
require.Nil(t, tx.Rollback())
}

99
database/pgsql/lock_test.go
Unescape View File

@ -1,99 +0,0 @@
// Copyright 2019 clair authors
//
// 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 pgsql
import (
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestAcquireLockReturnsExistingLockDuration(t *testing.T) {
tx, cleanup := createTestPgSessionWithFixtures(t, "Lock")
defer cleanup()
acquired, originalExpiration, err := tx.AcquireLock("test1", "owner1", time.Minute)
require.Nil(t, err)
require.True(t, acquired)
acquired2, expiration, err := tx.AcquireLock("test1", "owner2", time.Hour)
require.Nil(t, err)
require.False(t, acquired2)
require.Equal(t, expiration, originalExpiration)
}
func TestLock(t *testing.T) {
datastore, tx := openSessionForTest(t, "Lock", true)
defer datastore.Close()
var l bool
// Create a first lock.
l, _, err := tx.AcquireLock("test1", "owner1", time.Minute)
assert.Nil(t, err)
assert.True(t, l)
tx = restartSession(t, datastore, tx, true)
// lock again by itself, the previous lock is not expired yet.
l, _, err = tx.AcquireLock("test1", "owner1", time.Minute)
assert.Nil(t, err)
assert.True(t, l) // acquire lock no-op when owner already has the lock.
tx = restartSession(t, datastore, tx, false)
// Try to renew the same lock with another owner.
l, _, err = tx.ExtendLock("test1", "owner2", time.Minute)
assert.Nil(t, err)
assert.False(t, l)
tx = restartSession(t, datastore, tx, false)
l, _, err = tx.AcquireLock("test1", "owner2", time.Minute)
assert.Nil(t, err)
assert.False(t, l)
tx = restartSession(t, datastore, tx, false)
// Renew the lock.
l, _, err = tx.ExtendLock("test1", "owner1", 2*time.Minute)
assert.Nil(t, err)
assert.True(t, l)
tx = restartSession(t, datastore, tx, true)
// Unlock and then relock by someone else.
err = tx.ReleaseLock("test1", "owner1")
assert.Nil(t, err)
tx = restartSession(t, datastore, tx, true)
l, _, err = tx.AcquireLock("test1", "owner2", time.Minute)
assert.Nil(t, err)
assert.True(t, l)
tx = restartSession(t, datastore, tx, true)
// Create a second lock which is actually already expired ...
l, _, err = tx.AcquireLock("test2", "owner1", -time.Minute)
assert.Nil(t, err)
assert.True(t, l)
tx = restartSession(t, datastore, tx, true)
// Take over the lock
l, _, err = tx.AcquireLock("test2", "owner2", time.Minute)
assert.Nil(t, err)
assert.True(t, l)
tx = restartSession(t, datastore, tx, true)
if !assert.Nil(t, tx.Rollback()) {
t.FailNow()
}
}
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