Files
tidb/domain/schema_validator_test.go
2017-08-04 19:15:26 +08:00

130 lines
4.3 KiB
Go

// Copyright 2016 PingCAP, 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package domain
import (
"math/rand"
"time"
. "github.com/pingcap/check"
"github.com/pingcap/tidb/terror"
"github.com/pingcap/tidb/util/testleak"
)
type leaseGrantItem struct {
leaseGrantTS uint64
oldVer int64
schemaVer int64
}
func (*testSuite) TestSchemaValidator(c *C) {
defer testleak.AfterTest(c)()
lease := 5 * time.Millisecond
leaseGrantCh := make(chan leaseGrantItem)
oracleCh := make(chan uint64)
exit := make(chan struct{})
go serverFunc(lease, leaseGrantCh, oracleCh, exit)
validator := NewSchemaValidator(lease)
for i := 0; i < 10; i++ {
delay := time.Duration(100+rand.Intn(900)) * time.Microsecond
time.Sleep(delay)
// Reload can run arbitrarily, at any time.
reload(validator, leaseGrantCh, 0)
}
// Take a lease, check it's valid.
item := <-leaseGrantCh
validator.Update(item.leaseGrantTS, 0, item.schemaVer, nil)
valid := validator.Check(item.leaseGrantTS, item.schemaVer)
c.Assert(valid, IsTrue)
// Stop the validator, validator's items value is nil.
validator.Stop()
isTablesChanged, err := validator.IsRelatedTablesChanged(item.leaseGrantTS, item.schemaVer, nil)
c.Assert(terror.ErrorEqual(err, ErrInfoSchemaExpired), IsTrue)
c.Assert(isTablesChanged, IsFalse)
valid = validator.Check(item.leaseGrantTS, item.schemaVer)
c.Assert(valid, IsFalse)
validator.Restart()
// Sleep for a long time, check schema is invalid.
time.Sleep(lease)
ts := <-oracleCh
valid = validator.Check(ts, item.schemaVer)
c.Assert(valid, IsFalse)
currVer := reload(validator, leaseGrantCh, 0)
valid = validator.Check(ts, item.schemaVer)
c.Assert(valid, IsFalse)
// Check the latest schema version must changed.
c.Assert(item.schemaVer, Less, validator.Latest())
// Make sure newItem's version is bigger than currVer.
time.Sleep(lease * 2)
newItem := <-leaseGrantCh
// Update current schema version to newItem's version and the delta table IDs is 1, 2, 3.
validator.Update(ts, currVer, newItem.schemaVer, []int64{1, 2, 3})
// Make sure the updated table IDs don't be covered with the same schema version.
validator.Update(ts, newItem.schemaVer, newItem.schemaVer, nil)
isTablesChanged, err = validator.IsRelatedTablesChanged(ts, currVer, nil)
c.Assert(err, IsNil)
c.Assert(isTablesChanged, IsFalse)
isTablesChanged, err = validator.IsRelatedTablesChanged(ts, currVer, []int64{2})
c.Assert(err, IsNil)
c.Assert(isTablesChanged, IsTrue)
// The current schema version is older than the oldest schema version.
isTablesChanged, err = validator.IsRelatedTablesChanged(ts, -1, nil)
c.Assert(terror.ErrorEqual(err, ErrInfoSchemaChanged), IsTrue)
c.Assert(isTablesChanged, IsFalse)
// All schema versions is expired.
ts = uint64(time.Now().Add(lease).UnixNano())
isTablesChanged, err = validator.IsRelatedTablesChanged(ts, currVer, nil)
c.Assert(terror.ErrorEqual(err, ErrInfoSchemaExpired), IsTrue)
c.Assert(isTablesChanged, IsFalse)
exit <- struct{}{}
}
func reload(validator SchemaValidator, leaseGrantCh chan leaseGrantItem, ids ...int64) int64 {
item := <-leaseGrantCh
validator.Update(item.leaseGrantTS, item.oldVer, item.schemaVer, ids)
return item.schemaVer
}
// serverFunc plays the role as a remote server, runs in a separate goroutine.
// It can grant lease and provide timestamp oracle.
// Caller should communicate with it through channel to mock network.
func serverFunc(lease time.Duration, requireLease chan leaseGrantItem, oracleCh chan uint64, exit chan struct{}) {
var version int64
leaseTS := uint64(time.Now().UnixNano())
ticker := time.NewTicker(lease)
for {
select {
case <-ticker.C:
version++
leaseTS = uint64(time.Now().UnixNano())
case requireLease <- leaseGrantItem{
leaseGrantTS: leaseTS,
oldVer: version - 1,
schemaVer: version,
}:
case oracleCh <- uint64(time.Now().UnixNano()):
case <-exit:
return
}
}
}