TestWorks Conf Performance testing made easy with gatling - Guillaume Corré

Requirements

Background in programming1. Object oriented language mostly2. Functional programming is a plus, but optional

Experience1. Gatling?2. Scala?

Load Testing Done Righthttp://gatling.io

Guillaume Corré @notdryft

Workshop Schedule

1. Architecture2. Usage3. Exercises

Workshop Schedule

1. Architecture 2. Usage3. Exercises

Gatling: Architecture

Designed for :1. Complex use cases2. High Performance3. Maintainability

High PerformanceOptimize thread usage:

1. Non Blocking IO

2. Message oriented orchestration

High Performance

MaintainabilityCode

1. Real programming language2. DSL3. API

MaintainabilityWhy?

1. Versioning2. Refactoring3. Peer review4. Composition

Maintainability

class Simple extends Simulation { val scn = scenario("simple") .exec( http("home") .get("http://gatling.io") .check(status.is(200)))

setUp( scn.inject( atOnceUsers(1)))}

Workshop Schedule

1. Architecture2. Usage 3. Exercises

Gatling: Usage

Usage: DSL

Extensive documentation:http://gatling.io/#/docs

Cheat-sheet:http://gatling.io/docs/2.1.7/cheat-sheet.html

Usage: Very Fast Track

Step 1: Create a Simulation class

import io.gatling.core.Predef._import io.gatling.http.Predef._

import scala.concurrent.duration._

class Simple extends Simulation {

Step 2: Create a Scenario

import …

val scn = scenario("simple")}

Step 3: Chain Actions

import …

val scn = scenario("simple") .exec( http("home") .get("http://gatling.io"))}

Step 4: Check your requests are fine

import …

val scn = scenario("simple") .exec( http("home") .get("http://gatling.io") .check(status.is(200))}

Step 5: Set up and inject users

import …

val scn = scenario("simple") .exec( http("home") .get("http://gatling.io") .check(status.is(200))

setUp(scn.inject(atOnceUsers(1)))}

Step 6: Make things dynamic

// Set up virtual users with feedersfeed(csv("credentials.csv"))

// Capture response data with checkshttp("request") .get("url") .check(css("someSelector").saveAs("someVariable"))

// Craft requests with the Expression Languagehttp("request") .get("/foo?bar=${someVariable}")

// Use functionsexec { session => println(session) session}

Expressions

type Expression[T] = Session => Validation[T]

Workshop Schedule

1. Architecture2. Usage3. Exercises

Workshop

4 exercises1. Ranged from (almost) easy to difficult2. Each pinpoint different specifics of Gatling

Urlbit.ly/gatling-workshop

Documentation reminderhttp://gatling.io/#/docs

http://gatling.io/docs/2.1.7/cheat-sheet.html

Exercise 1:1. First RequestWhat happens if you don't do any checks?

1. Gatling adds a status check by default

Exercise 1:1. First RequestAre there any defaults? If so, which?

1. status.in2. All statuses of the 20x family3. 304

Exercise 1:3. ChecksWhich check should you use to fetch the title ?

1. Regex1. Most the time harder to maintain2. Still does the job pretty well

2. XPath1. HTML needs to be strict and well formed

3. CSS is easy to read and fast1. css("#logo-section a", "title")

Exercise 1:3. ChecksWhat happens when a check matches more than a single element?

1. exists by default2. And, if you don’t specify a fetch method but try to save,

Gatling will add a find(0) before saveAs

Exercise 1:4. Information retrieval

Which check should you use to fetch the menu links ?1. css("#main-menu-inner > ul > li > a", "href")

Exercise 1:4. Information retrievalHow can you save all matches?

1. findAll

Exercise 1:4. Information retrievalHow can you access the “menuLinks” attribute?

1. Use the exec { session => … } syntax2. session(“menuLinks”) for extraction3. Then, either

1. as[Type]2. asOption[Type]3. validate[Type]

4. Validate recommended unless you know what you are doing

Exercise 1:4. Iterate over menu linksWhich DSL element should you use?

1. foreach2. Takes an Expression[String] as its first argument

1. Which is a function of Session to Validation[String]3. Gatling does the EL conversion for you

Exercise 1:4. Iterate over menu linksHow do think it works behind the hood?

1. Iterate over each element2. Put current element into the session as an attribute3. Run the action block with the new session

Exercise 2:1. Fetch the login pageWhich baseURL should you use?

1. Gatling doesn’t add a / before concatenating2. One of the following

1. baseURL(“https://github.com”) and get(“/login”)2. baseURL(“https://github.com/“) and get(“login”)

3. Prefer the first one

Exercise 2:1. Fetch the login pageWhich check should you use?

1. The general idea is to make sure you are on the page you requested

2. css(".auth-form form h1").is("Sign in")

Exercise 2:2.1. Performing the loginWhich request should you do?

1. /sessionWhich HTTP method does it need to use?

2. POST

Exercise 2:2.2. Specifying additional parametersDo you think these are generated or provided?

1. Generated by Github, provided in the HTML.Where can you fetch thoses?

2. Add a check to the previous request3. css(".auth-form form input[name='authenticity_token']",

“value").saveAs("authenticityToken")

Exercise 2:3. ChecksWhich checks should you use to be sure you are logged in?

1. Check for content, titles, css, etc.2. css(“.logged_in”)3. exists is a default

Exercise 2:4. Feeding the credentialsWhich feeder file format could you use?

1. Multiple formats are handled by Gatling1. CSV, TSV, etc.

2. Just beware of malformed files

Exercise 2:4. Feeding the credentialsHow does the session interact with the feeder?

1. A feeder outputs lines of CSV (and else) files into the session

2. One line per user, with different methods of retrieval1. Queue, failure when reading is over2. Random3. Shuffle, which is a shuffle + queue4. Circular

3. If you want more, you can skip the feeding to Gatling and fetch the records yourself

Exercise 3:1. Create gistThink of multiple ways to load the templates

1. StringBody2. RawFileBody3. ELFileBody, with parsed content

Exercise 3:1. Create gistWhich one is better in this case?

1. All are good2. Still, scala can handle string template pretty well3. => StringBody

Exercise 4:Part 1. 1. Start simpleIs using java.util.Random a good idea in this case?What could happen if you do?

1. Random is synchronized2. Multiples threads would block each other when fetching3. ThreadLocalRandom is not4. It creates a single Random for each Thread, resolving

conflicts

Exercise 4:Part 1. 4. A twistHow does Gatling execute requests?

1. Each requests are launched in sequence2. They cannot overlap3. And cannot be launched asynchronously

How should we proceed instead?

Exercise 4:Part 1. 4. A twistHow does Gatling execute requests?

1. Each requests are launched in sequence2. They cannot overlap3. And cannot be launched asynchronously

How should we proceed instead?4. We can use the resources mechanism5. Not its purpose, but it will work

Exercise 4:Part 1I. 2. Making the queriesIs the number of tiles requested really fixed?

1. What about edges ?2. Will reduce the number of tiles3. We can reduce the bounds, excluding the edges

Exercise 4:Part 1I. 2. Making the queriesMixing Gatling’s EL and Scala’s String Macro

1. This a Gatling EL: “${variableName}”2. Theses are Scala Macros:

1. s”$variableName”2. s”${variableName}

Exercise 4:Part 1I. 2. Making the queriesMixing Gatling’s EL and Scala’s String Macro

1. This a Gatling EL: “${variableName}”2. Theses are Scala Macros:

1. s”$variableName”2. s”${variableName}

How?1. Escape Gatling’s EL when in a Scala String Macro

1. s”$${gatlingVariable}/${otherVariable}”2. will output “${gatlingVariable}/variableContent”

Workshop

Solutions1. Not available yet

Urlbit.ly/gatling-workshop-solutions

http://gatling.io

http://github.com/gatling/gatling

@GatlingTool

TestWorks Conf Performance testing made easy with gatling - Guillaume Corré

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