My Gatling gun tears your meat Grinder apart

Your customer needs to load test their API but you're short on time and have to deliver some numbers within a week. Ah, and you've never done any load testing before. What do you do?

Transcript

1. MY GATLING GUN TEARS YOUR MEAT GRINDER APART A novice’s first exposure to load testing javaBin julemøte Trondheim Jan Fredrik Wedén 2012
2. (Help!) We have a SOAP service Mission:
3. I can haz load test in a week kthxbye (Help!) We have a SOAP service Mission:
4. Goal for today: What was done What’s the easiest path to get started
5. Tools: SoapUI/LoadUI (http://www.soapui.org/) The Grinder (http://grinder.sourceforge.net/) Gatling (http://gatling-tool.org/)
6. Decision factors DG1
7. Factor The Grinder Gatling Well-known +++ -
8. Factor The Grinder Gatling Well-known +++ - Maturity +++ +
9. Factor The Grinder Gatling Well-known +++ - Maturity +++ + Getting started ++ +++
10. Factor The Grinder Gatling Well-known +++ - Maturity +++ + Getting started ++ +++ Buzzwords + +++++
11. Factor The Grinder Gatling Well-known +++ - Maturity +++ + Getting started ++ +++ Buzzwords + +++++ Gut feeling +++ +
12. Factor The Grinder Gatling Well-known +++ - Maturity +++ + Getting started ++ +++ Buzzwords + +++++ Gut feeling +++ + DG1 12 10
13. Decision factors DG2
14. Factor The Grinder Gatling Readability - +++
15. Factor The Grinder Gatling Readability - +++ Scaffolding - +++
16. def createRequest(test, url, headers): request = HTTPRequest(url=url) if headers: request.headers=headers test.record(request, HTTPRequest.getHttpMethodFilter()) return request request101 = createRequest(Test(101, 'POST getCustomers'), URL, globalHeaders) class TestRunner: def getCustomersRequest(self, username): result = request101.POST(URL, “bar”, headers) def __call__(self): self.getCustomersRequest() Test(100, 'getCustomers').record(TestRunner.getCustomersRequest) The Grinder
17. Class APISimulation extends Simulation { def apply = { val myScenario = scenario(”Customers scenario") .exec(http("getCustomers") .post(URL) .header("Content-Type", ""”foo""") .body(”bar”) ) List(myScenario.configure.users(10).ramp(20).protocolConfig(httpConf)) } } Gatling
18. Factor The Grinder Gatling Readability - +++ Scaffolding - +++ Multiple users - +++
19. users = [] usersfile = open("./users.txt", "r") for line in usersfile.readlines(): if not line.startswith('#'): users.append(line.strip().split(',')) usersfile.close() … (uidToUse, pwdToUse) = users[grinder.threadNumber % len(users)] The Grinder
20. val scn = scenario(”Customers scenario") .feed(csv("users.csv")) … Gatling
21. Factor The Grinder Gatling Readability - +++ Scaffolding - +++ Multiple users - +++ Extensibility +++ ++
22. Factor The Grinder Gatling Readability - +++ Scaffolding - +++ Multiple users - +++ Extensibility +++ ++ Reports ? +++
23. Factor The Grinder Gatling Readability - +++ Scaffolding - +++ Multiple users - +++ Extensibility +++ ++ Reports ? +++ Request body - +++
24. template = open("./requesttemplates/getCustomers.xml") getCustomersTemplate = template.read() template.close() … def getCustomersRequest(self, username): customersMsg = getCustomersTemplate.replace("${uid}", username) result = request101.POST(URL, customersMsg, headers) The Grinder
25. .exec(http("getCustomers") .post(URL) .header("Content-Type", ""”blah""") .fileBody("getCustomers", Map("uid" -> "${uid}”)) ) Gatling
26. Factor The Grinder Gatling Readability - +++ Scaffolding - +++ Multiple users - +++ Extensibility +++ ++ Reports ? +++ Request body - +++ Checks + +++
27. contractNumExpression = re.compile(r"ContractNum>(\d*)</") … def getContractsRequest(self, username, securityKey): contractsMsg = getContractsTemplate.replace("${uid}", username) result = request301.POST(URL, contractsMsg, headers) if 'soap:Fault' in httpResponse.text: grinder.logger.debug(result.text) grinder.statistics.forCurrentTest.setSuccess(False) return result … contractsResponse = self.getContractsRequest(uidToUse, securityKey) contractMatch = contractNumExpression.search(contractsResponse.text) if contractMatch: contractNum = contractMatch.group(1) if contractMatch: self.getContractDetailRequest(uidToUse, securityKey, contractNum) The Grinder
28. .exec(http("getContracts") .post(URL) .header("Content-Type", ""”blah""") .fileBody("getContracts", Map("uid" -> "${uid}”)) .check( status.is(200), regex("""soap:Fault""").notExists, regex("""ContractNum>(\d*)</""").whatever.saveAs("contractnum”) ) ) .doIf(session => session.isAttributeDefined("contractnum”)) { exec(http("getContractDetail") … } Gatling
29. Factor The Grinder Gatling Readability - +++ Scaffolding - +++ Multiple users - +++ Extensibility +++ ++ Reports ? +++ Request body - +++ Checks + +++ Scaling +++ +
30. Factor The Grinder Gatling Readability - +++ Scaffolding - +++ Multiple users - +++ Extensibility +++ ++ Reports ? +++ Request body - +++ Checks + +++ Scaling +++ + DG2 7 21
31. The Grinder 19 Gatling 31 The finals
32. Gatling may not tear The Grinder (completely) apart Conclusion: But it makes some serious dents and is my winner
33. THANK YOU! Jan Fredrik Wedén @jfweden