![Validation
Validation[+T]
- map
- flatMap
Success[+T]
(value: T)
Failure
(message: String)](https://image.slidesharecdn.com/gatling-perfug-131217042520-phpapp01/85/Gatling-Paris-Perf-User-Group-25-320.jpg)
![New Expression API
type Expression[T] = Session => Validation[T]
implicit def toExpression[T](s: String): Expression[T]](https://image.slidesharecdn.com/gatling-perfug-131217042520-phpapp01/85/Gatling-Paris-Perf-User-Group-27-320.jpg)
![New Session API
val foo: Validation[T] = session("foo").validate[T]
// unsafe:
val bar: T = session("foo").as[T]
val baz: Option[T] = session("foo").asOption[T]](https://image.slidesharecdn.com/gatling-perfug-131217042520-phpapp01/85/Gatling-Paris-Perf-User-Group-28-320.jpg)
![String interpolation
val jsonTemplate: Expression[String] = session =>
for {
foo <- session("foo").validate[String]
bar <- session("bar").validate[Int]
} yield s"""{
foo: "$foo",
bar: $bar
}"""](https://image.slidesharecdn.com/gatling-perfug-131217042520-phpapp01/85/Gatling-Paris-Perf-User-Group-36-320.jpg)
![Fastring
val jsonTemplate: Expression[String] = session =>
for (foos <- session("foos").validate[Seq[String]]) yield
fast"""{
foos = [
${foos.map(foo => fast"""{foo: "$foo"}""").mkFastring("n")}
]
}""".toString](https://image.slidesharecdn.com/gatling-perfug-131217042520-phpapp01/85/Gatling-Paris-Perf-User-Group-39-320.jpg)
(implicit groupExtractor: GroupExtractor[T])
object GroupExtractor {
implicit val groupExtractor2:
GroupExtractor[(String, String)] = ???
}
trait GroupExtractor
regex[(String, String)]("foo(.*)bar(.*)baz")](https://image.slidesharecdn.com/gatling-perfug-131217042520-phpapp01/85/Gatling-Paris-Perf-User-Group-44-320.jpg)
![Also for
• headerRegex[T]
T of String, Tuple2[String] , Tuple3[String]…
• jsonPath[T]
T of Int, Long, Double, Float, String, List, Map
• XPath?
• CSS selectors?](https://image.slidesharecdn.com/gatling-perfug-131217042520-phpapp01/85/Gatling-Paris-Perf-User-Group-45-320.jpg)
Gatling - Paris Perf User Group
- 1. Load testing made easy Stéphane Landelle @ eBusiness Information @slandelle
- 2. " GUI" - Code (Scala) " 1user=1thread" - Actor model " Blocking I/O - Non blocking I/O
- 4. Write Scala code… val scn = scenario("Scala.Io DoS") .repeat(10000) { exec(http("Scala.Io").get("http://scala.io")) } setUp( scn.inject(rampUsers(10000) over 30 seconds) )
- 5. … use the rich DSL … Checks regex / css / xpath / jsonPath find / findAll / count is / in / not / whatever Structures doIf / repeat / during / asLongAs randomSwitch / roundRobinSwitch Error handling tryMax / exitBlockOnFail Feeders csv / tsv / jdbc
- 6. … or use the Recorder
- 8. Actors
- 9. Scenario = Actor Workflow Start Actor Http Request Actor Session Repeat Actor End Actor Async Handler Actor
- 10. Scenario = Actor Workflow Start Actor Repeat Actor End Actor Session Http Request Actor Async Handler Actor
- 11. Scenario = Actor Workflow Start Actor Repeat Actor End Actor Session Http Request Actor Async Handler Async Handler Actor
- 12. Scenario = Actor Workflow Start Actor Http Request Actor End Actor Repeat Actor Session Async Handler Async Handler Actor
- 13. Scenario = Actor Workflow Start Actor End Actor Repeat Actor Session Http Request Actor Async Handler Actor
- 14. Scenario = Actor Workflow Start Actor Http Request Actor Session Repeat Actor End Actor Async Handler Actor
- 15. I/O"
- 16. NIO
- 17. Extensions"
- 18. • • • • • Maven Plugin Maven archetype (run in IDE) Jenkins plugin Graphite live reporting SBT plugin (WIP)
- 20. Gatling 2"
- 21. • Planned for 2014: o Tons of refactoring o Tons of new features • Sorry folks, we’re late: o Greater good: stability • Milestones: o Current M3 o Next M4 december?
- 23. Expression in Gatling 1 type Expression = Session => String implicit def toExpression(s: String): Expression http("Foo").get("https://www.google.fr/search?q=${term}")
- 24. Gatling 1 issues o What if “term” is undefined? o What if “term” is of wrong type? repeat("${times}") {} // Expects Int foreach("${seq}”) {} // Expects Seq è Unsafe, deal with Exceptions, not generic
- 25. Validation Validation[+T] - map - flatMap Success[+T] (value: T) Failure (message: String)
- 26. Usage: Building a request flatMap that s**t! buildURI(httpAttributes.urlOrURI) .flatMap(configureQueryCookiesAndProxy) .flatMap(configureVirtualHost) .flatMap(configureHeaders) .flatMap(configureRealm)
- 27. New Expression API type Expression[T] = Session => Validation[T] implicit def toExpression[T](s: String): Expression[T]
- 28. New Session API val foo: Validation[T] = session("foo").validate[T] // unsafe: val bar: T = session("foo").as[T] val baz: Option[T] = session("foo").asOption[T]
- 30. Templating API in Gatling 1 • (Session => String) / Expression: o Function o Implicitly compiled EL String • Scalate SSP
- 31. Scalate SSP o Can have complex logic o Scala compiler in the background (overhead, proper stop) o Own API, learning curve o Does play well with Session API Why do we need this anyway?
- 32. New Templating API: the EL way Embedded // passing an EL String setBody(StringBody("""{ foo: "${foo}", bar: ${bar} }""")
- 33. New Templating API: the EL way External EL based text file // passing an EL File setBody(ELFileBody("body.txt")) { foo: "${foo}", bar: ${bar} }
- 34. New Templating API: the EL way o Simple o Limited, can’t implement complex logic
- 35. Why do we need non-Scala templates anyway?! We’re not in JSP world! We have multiline Strings and macros!
- 36. String interpolation val jsonTemplate: Expression[String] = session => for { foo <- session("foo").validate[String] bar <- session("bar").validate[Int] } yield s"""{ foo: "$foo", bar: $bar }"""
- 37. String interpolation o Pure Scala o Compile time, not runtime o Standard Scala library o Requires a bit more Scala skills o Complex logic => intermediate String concatenations
- 38. Fastring https://github.com/Atry/fastring • StringBuilder underneath • Produces Fastrings, not Strings
- 39. Fastring val jsonTemplate: Expression[String] = session => for (foos <- session("foos").validate[Seq[String]]) yield fast"""{ foos = [ ${foos.map(foo => fast"""{foo: "$foo"}""").mkFastring("n")} ] }""".toString
- 41. Regex check in Gatling 1 regex("foo(.*)bar").saveAs("baz") è produces Strings è no more than 1 capture group
- 42. Issue <form> <input type="hidden" name="foo" value="foo" /> <input type="hidden" name="bar" value="baz" /> </form> è workaround: 2 regex + manual zip
- 43. Tuple support We need: String (String, String) (String, String, String) (String, String, String, String) … But generic, please…
- 44. Type class FTW regex[T](pattern: Expression[String]) (implicit groupExtractor: GroupExtractor[T]) object GroupExtractor { implicit val groupExtractor2: GroupExtractor[(String, String)] = ??? } trait GroupExtractor regex[(String, String)]("foo(.*)bar(.*)baz")
- 45. Also for • headerRegex[T] T of String, Tuple2[String] , Tuple3[String]… • jsonPath[T] T of Int, Long, Double, Float, String, List, Map • XPath? • CSS selectors?
- 48. Not how browsers work Resource 1 HTML page Resource 2 Resource 3 Parallel workflow
- 49. Very complex actually 1. Fetch HTML 2. Fetch HTML embedded resources 3. Fetch some additional resources (CSS @import) 4. Fetch matching CSS rules resources (@font-face, background-image) 5. … (not accounting for javascript) è Can’t be perfect without being a browser è Will have to approximate
- 50. Kind of scatter-gather pattern Fetch resources HTML page Session + HTML Resource Fetcher Actor New Session Beware of Session reconciliation! Next