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stress.go
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stress.go
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/*
* Copyright (c) 2002-2019 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j.
*
* 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 stress
import (
"fmt"
"strings"
"sync"
"sync/atomic"
"github.com/neo4j/neo4j-go-driver/neo4j"
//. "github.com/neo4j/neo4j-go-driver/neo4j/utils/test"
. "github.com/onsi/gomega"
)
// TestContext provides state data shared across tests
type TestContext struct {
driver neo4j.Driver
stop int32
bookmark atomic.Value
readNodeCountsByServer sync.Map
readNodeCount int32
createdNodeCount int32
failedBookmarkCount int32
leaderSwitchCount int32
}
// NewTestContext returns a new TestContext
func NewTestContext(driver neo4j.Driver) *TestContext {
result := &TestContext{
driver: driver,
stop: 0,
bookmark: atomic.Value{},
readNodeCountsByServer: sync.Map{},
readNodeCount: 0,
createdNodeCount: 0,
failedBookmarkCount: 0,
leaderSwitchCount: 0,
}
result.bookmark.Store("")
return result
}
// ShouldStop returns whether a stop is signalled
func (ctx *TestContext) ShouldStop() bool {
return atomic.LoadInt32(&ctx.stop) > 0
}
// Stop signals a stop
func (ctx *TestContext) Stop() {
atomic.CompareAndSwapInt32(&ctx.stop, 0, 1)
}
func (ctx *TestContext) addCreated() {
atomic.AddInt32(&ctx.createdNodeCount, 1)
}
func (ctx *TestContext) addRead() {
atomic.AddInt32(&ctx.readNodeCount, 1)
}
func (ctx *TestContext) addBookmarkFailure() {
atomic.AddInt32(&ctx.failedBookmarkCount, 1)
}
func (ctx *TestContext) getBookmark() string {
return ctx.bookmark.Load().(string)
}
func (ctx *TestContext) setBookmark(bookmark string) {
ctx.bookmark.Store(bookmark)
}
func (ctx *TestContext) processSummary(summary neo4j.ResultSummary) {
ctx.addRead()
if summary == nil {
return
}
var count int32
lastCountInt, _ := ctx.readNodeCountsByServer.LoadOrStore(summary.Server().Address(), &count)
lastCount := lastCountInt.(*int32)
atomic.AddInt32(lastCount, 1)
}
func (ctx *TestContext) handleFailure(err error) bool {
if err != nil && strings.Contains(err.Error(), "no longer accepts writes") {
atomic.AddInt32(&ctx.leaderSwitchCount, 1)
return true
}
return false
}
// PrintStats writes summary information about the completed test
func (ctx *TestContext) PrintStats() {
fmt.Printf("Stats:\n")
fmt.Printf("\tNodes Created: %d\n", ctx.createdNodeCount)
fmt.Printf("\tNodes Read: %d\n", ctx.readNodeCount)
fmt.Printf("\tBookmarks Failed: %d\n", ctx.failedBookmarkCount)
fmt.Printf("\tLeader Switches: %d\n", ctx.leaderSwitchCount)
fmt.Printf("\tRead Counts By Server:\n")
ctx.readNodeCountsByServer.Range(func(key, value interface{}) bool {
fmt.Printf("\t\t%s: %d\n", key.(string), *(value.(*int32)))
return true
})
}
func newStressSession(driver neo4j.Driver, useBookmark bool, accessMode neo4j.AccessMode, ctx *TestContext) neo4j.Session {
var session neo4j.Session
var err error
if useBookmark {
session, err = driver.Session(accessMode, ctx.getBookmark())
} else {
session, err = driver.Session(accessMode)
}
Expect(err).To(BeNil())
Expect(session).NotTo(BeNil())
return session
}
func newStressTransaction(session neo4j.Session, useBookmark bool, ctx *TestContext) neo4j.Transaction {
var tx neo4j.Transaction
var err error
if useBookmark {
for {
if tx, err = session.BeginTransaction(); err == nil {
return tx
}
if neo4j.IsTransientError(err) {
ctx.addBookmarkFailure()
} else {
Expect(neo4j.IsTransientError(err)).To(BeTrue())
//Expect(err).To(BeTransientError(nil, nil))
}
}
}
tx, err = session.BeginTransaction()
Expect(err).To(BeNil())
Expect(tx).NotTo(BeNil())
return tx
}
// ReadQueryExecutor returns a new test executor which reads using Session.Run
func ReadQueryExecutor(driver neo4j.Driver, useBookmark bool) func(ctx *TestContext) {
return func(ctx *TestContext) {
session := newStressSession(driver, useBookmark, neo4j.AccessModeRead, ctx)
defer session.Close()
result, err := session.Run("MATCH (n) RETURN n LIMIT 1", nil)
Expect(err).To(BeNil())
if result.Next() {
nodeInt := result.Record().GetByIndex(0)
Expect(nodeInt).NotTo(BeNil())
_, ok := nodeInt.(neo4j.Node)
Expect(ok).To(BeTrue())
}
Expect(result.Err()).To(BeNil())
Expect(result.Next()).To(BeFalse())
summary, err := result.Summary()
Expect(err).To(BeNil())
Expect(summary).NotTo(BeNil())
ctx.processSummary(summary)
}
}
// ReadQueryInTxExecutor returns a new test executor which reads using Transaction.Run
func ReadQueryInTxExecutor(driver neo4j.Driver, useBookmark bool) func(ctx *TestContext) {
return func(ctx *TestContext) {
session := newStressSession(driver, useBookmark, neo4j.AccessModeRead, ctx)
defer session.Close()
tx := newStressTransaction(session, useBookmark, ctx)
defer tx.Close()
result, err := tx.Run("MATCH (n) RETURN n LIMIT 1", nil)
Expect(err).To(BeNil())
if result.Next() {
nodeInt := result.Record().GetByIndex(0)
Expect(nodeInt).NotTo(BeNil())
_, ok := nodeInt.(neo4j.Node)
Expect(ok).To(BeTrue())
}
Expect(result.Err()).To(BeNil())
Expect(result.Next()).To(BeFalse())
summary, err := result.Summary()
Expect(err).To(BeNil())
Expect(summary).NotTo(BeNil())
err = tx.Commit()
Expect(err).To(BeNil())
ctx.processSummary(summary)
}
}
// ReadQueryWithReadTransactionExecutor returns a new test executor which reads using Session.ReadTransaction
func ReadQueryWithReadTransactionExecutor(driver neo4j.Driver, useBookmark bool) func(ctx *TestContext) {
return func(ctx *TestContext) {
session := newStressSession(driver, useBookmark, neo4j.AccessModeRead, ctx)
defer session.Close()
summary, err := session.ReadTransaction(func(tx neo4j.Transaction) (interface{}, error) {
result, err := tx.Run("MATCH (n) RETURN n LIMIT 1", nil)
Expect(err).To(BeNil())
if result.Next() {
nodeInt := result.Record().GetByIndex(0)
Expect(nodeInt).NotTo(BeNil())
_, ok := nodeInt.(neo4j.Node)
Expect(ok).To(BeTrue())
}
Expect(result.Err()).To(BeNil())
Expect(result.Next()).To(BeFalse())
return result.Summary()
})
Expect(err).To(BeNil())
Expect(summary).NotTo(BeNil())
ctx.processSummary(summary.(neo4j.ResultSummary))
}
}
// WriteQueryExecutor returns a new test executor which writes using Session.Run
func WriteQueryExecutor(driver neo4j.Driver, useBookmark bool) func(ctx *TestContext) {
return func(ctx *TestContext) {
session := newStressSession(driver, useBookmark, neo4j.AccessModeWrite, ctx)
defer session.Close()
result, err := session.Run("CREATE ()", nil)
Expect(err).To(BeNil())
summary, err := result.Consume()
if !ctx.handleFailure(err) {
Expect(err).To(BeNil())
Expect(summary.Counters().NodesCreated()).To(BeEquivalentTo(1))
ctx.setBookmark(session.LastBookmark())
ctx.addCreated()
}
}
}
// WriteQueryInTxExecutor returns a new test executor which writes using Transaction.Run
func WriteQueryInTxExecutor(driver neo4j.Driver, useBookmark bool) func(ctx *TestContext) {
return func(ctx *TestContext) {
session := newStressSession(driver, useBookmark, neo4j.AccessModeWrite, ctx)
defer session.Close()
tx := newStressTransaction(session, useBookmark, ctx)
defer tx.Close()
result, err := tx.Run("CREATE ()", nil)
Expect(err).To(BeNil())
summary, err := result.Consume()
if !ctx.handleFailure(err) {
Expect(err).To(BeNil())
Expect(summary.Counters().NodesCreated()).To(BeEquivalentTo(1))
err = tx.Commit()
Expect(err).To(BeNil())
ctx.setBookmark(session.LastBookmark())
ctx.addCreated()
}
}
}
// WriteQueryWithWriteTransactionExecutor returns a new test executor which writes using Session.WriteTransaction
func WriteQueryWithWriteTransactionExecutor(driver neo4j.Driver, useBookmark bool) func(ctx *TestContext) {
return func(ctx *TestContext) {
session := newStressSession(driver, useBookmark, neo4j.AccessModeWrite, ctx)
defer session.Close()
summary, err := session.WriteTransaction(func(tx neo4j.Transaction) (interface{}, error) {
result, err := tx.Run("CREATE ()", nil)
Expect(err).To(BeNil())
return result.Consume()
})
if !ctx.handleFailure(err) {
Expect(err).To(BeNil())
Expect(summary).NotTo(BeNil())
Expect(summary.(neo4j.ResultSummary).Counters().NodesCreated()).To(BeEquivalentTo(1))
ctx.setBookmark(session.LastBookmark())
ctx.addCreated()
}
}
}
// WriteQueryInReadSessionExecutor returns a new test executor which tries writes using Session.Run with read access mode
func WriteQueryInReadSessionExecutor(driver neo4j.Driver, useBookmark bool) func(ctx *TestContext) {
return func(ctx *TestContext) {
session := newStressSession(driver, useBookmark, neo4j.AccessModeRead, ctx)
defer session.Close()
result, err := session.Run("CREATE ()", nil)
Expect(err).To(BeNil())
summary, err := result.Consume()
Expect(err).ToNot(BeNil())
//Expect(err).To(BeGenericError(ContainSubstring("write queries cannot be performed in read access mode")))
Expect(summary).To(BeNil())
}
}
// WriteQueryInTxInReadSessionExecutor returns a new test executor which tries writes using Transaction.Run with read access mode
func WriteQueryInTxInReadSessionExecutor(driver neo4j.Driver, useBookmark bool) func(ctx *TestContext) {
return func(ctx *TestContext) {
session := newStressSession(driver, useBookmark, neo4j.AccessModeRead, ctx)
defer session.Close()
tx := newStressTransaction(session, useBookmark, ctx)
defer tx.Close()
result, err := tx.Run("CREATE ()", nil)
Expect(err).To(BeNil())
summary, err := result.Consume()
Expect(err).ToNot(BeNil())
//Expect(err).To(BeGenericError(ContainSubstring("write queries cannot be performed in read access mode")))
Expect(summary).To(BeNil())
}
}
// FailingQueryExecutor returns a new test executor which fails in streaming using Session.Run
func FailingQueryExecutor(driver neo4j.Driver, useBookmark bool) func(ctx *TestContext) {
return func(ctx *TestContext) {
session := newStressSession(driver, useBookmark, neo4j.AccessModeRead, ctx)
defer session.Close()
result, err := session.Run("UNWIND [10, 5, 0] AS x RETURN 10 / x", nil)
Expect(err).To(BeNil())
summary, err := result.Consume()
Expect(err).ToNot(BeNil())
//Expect(err).To(BeArithmeticError())
Expect(summary).To(BeNil())
}
}
// FailingQueryInTxExecutor returns a new test executor which fails in streaming using Transaction.Run
func FailingQueryInTxExecutor(driver neo4j.Driver, useBookmark bool) func(ctx *TestContext) {
return func(ctx *TestContext) {
session := newStressSession(driver, useBookmark, neo4j.AccessModeRead, ctx)
defer session.Close()
tx := newStressTransaction(session, useBookmark, ctx)
defer tx.Close()
result, err := tx.Run("UNWIND [10, 5, 0] AS x RETURN 10 / x", nil)
Expect(err).To(BeNil())
summary, err := result.Consume()
Expect(err).ToNot(BeNil())
//Expect(err).To(BeArithmeticError())
Expect(summary).To(BeNil())
}
}
// FailingQueryWithReadTransactionExecutor returns a new test executor which fails in streaming using Session.ReadTransaction
func FailingQueryWithReadTransactionExecutor(driver neo4j.Driver, useBookmark bool) func(ctx *TestContext) {
return func(ctx *TestContext) {
session := newStressSession(driver, useBookmark, neo4j.AccessModeRead, ctx)
defer session.Close()
summary, err := session.ReadTransaction(func(tx neo4j.Transaction) (interface{}, error) {
result, err := tx.Run("UNWIND [10, 5, 0] AS x RETURN 10 / x", nil)
Expect(err).To(BeNil())
return result.Consume()
})
Expect(err).ToNot(BeNil())
//Expect(err).To(BeArithmeticError())
Expect(summary).To(BeNil())
}
}
// FailingQueryWithWriteTransactionExecutor returns a new test executor which fails in streaming using Session.WriteTransaction
func FailingQueryWithWriteTransactionExecutor(driver neo4j.Driver, useBookmark bool) func(ctx *TestContext) {
return func(ctx *TestContext) {
session := newStressSession(driver, useBookmark, neo4j.AccessModeRead, ctx)
defer session.Close()
summary, err := session.WriteTransaction(func(tx neo4j.Transaction) (interface{}, error) {
result, err := tx.Run("UNWIND [10, 5, 0] AS x RETURN 10 / x", nil)
Expect(err).To(BeNil())
return result.Consume()
})
Expect(err).ToNot(BeNil())
//Expect(err).To(BeArithmeticError())
Expect(summary).To(BeNil())
}
}
// WrongQueryExecutor returns a new test executor which fails using Session.Run
func WrongQueryExecutor(driver neo4j.Driver) func(ctx *TestContext) {
return func(ctx *TestContext) {
session := newStressSession(driver, false, neo4j.AccessModeRead, ctx)
defer session.Close()
result, err := session.Run("RETURN wrongThing", nil)
Expect(err).To(BeNil())
_, err = result.Consume()
Expect(err).ToNot(BeNil())
//Expect(err).To(BeSyntaxError())
}
}
// WrongQueryInTxExecutor returns a new test executor which fails using Transaction.Run
func WrongQueryInTxExecutor(driver neo4j.Driver) func(ctx *TestContext) {
return func(ctx *TestContext) {
session := newStressSession(driver, false, neo4j.AccessModeWrite, ctx)
defer session.Close()
tx := newStressTransaction(session, false, ctx)
defer tx.Close()
result, err := tx.Run("RETURN wrongThing", nil)
Expect(err).To(BeNil())
_, err = result.Consume()
Expect(err).ToNot(BeNil())
//Expect(err).To(BeSyntaxError())
}
}