95 lines
2.6 KiB
Go
95 lines
2.6 KiB
Go
// Copyright 2016 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package domain
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import (
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"math/rand"
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"time"
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. "github.com/pingcap/check"
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"github.com/pingcap/tidb/util/testleak"
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)
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type leaseGrantItem struct {
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leaseGrantTS uint64
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schemaVer int64
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}
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func (*testSuite) TestSchemaValidator(c *C) {
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defer testleak.AfterTest(c)()
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lease := 2 * time.Millisecond
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leaseGrantCh := make(chan leaseGrantItem)
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oracleCh := make(chan uint64)
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exit := make(chan struct{})
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go serverFunc(lease, leaseGrantCh, oracleCh, exit)
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validator := newSchemaValidator(lease)
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for i := 0; i < 10; i++ {
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delay := time.Duration(100+rand.Intn(900)) * time.Microsecond
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time.Sleep(delay)
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// Reload can run arbitrarily, at any time.
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reload(validator, leaseGrantCh)
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}
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// Take a lease, check it's valid.
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item := <-leaseGrantCh
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validator.Update(item.leaseGrantTS, item.schemaVer)
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valid := validator.Check(item.leaseGrantTS, item.schemaVer)
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c.Assert(valid, IsTrue)
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// Sleep for a long time, check schema is invalid.
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time.Sleep(lease)
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ts := <-oracleCh
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valid = validator.Check(ts, item.schemaVer)
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c.Assert(valid, IsFalse)
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reload(validator, leaseGrantCh)
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valid = validator.Check(ts, item.schemaVer)
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c.Assert(valid, IsFalse)
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// Check the latest schema version must changed.
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c.Assert(item.schemaVer, Less, validator.Latest())
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exit <- struct{}{}
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}
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func reload(validator SchemaValidator, leaseGrantCh chan leaseGrantItem) {
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item := <-leaseGrantCh
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validator.Update(item.leaseGrantTS, item.schemaVer)
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}
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// serverFunc plays the role as a remote server, runs in a seperate goroutine.
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// It can grant lease and provide timestamp oracle.
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// Caller should communicate with it through channel to mock network.
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func serverFunc(lease time.Duration, requireLease chan leaseGrantItem, oracleCh chan uint64, exit chan struct{}) {
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var version int64
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leaseTS := uint64(time.Now().UnixNano())
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ticker := time.NewTicker(lease)
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for {
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select {
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case <-ticker.C:
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version++
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leaseTS = uint64(time.Now().UnixNano())
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case requireLease <- leaseGrantItem{
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leaseGrantTS: leaseTS,
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schemaVer: version,
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}:
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case oracleCh <- uint64(time.Now().UnixNano()):
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case <-exit:
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return
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}
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}
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}
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