I am using gatling (2.1.7) in order to stress test an API.
For of all I have to request a transaction id and shared secret in order to authenticate all subsequent calls.
scenario("API").exec(http("authorize")
.post("/api/v1/xxx/authorize")
.formParam("client_key", "a_very_strong_key")
.check(jsonPath("$.response.txId").saveAs("id"))
.check(jsonPath("$.response.txSecret").saveAs("secret")))
All other calls must contain a query parameter signature which is a mac of the other request parameters.
I wrote this piece of code to do that
scenario("API").exec(http("call")
.get("/api/v1/call")
.queryParam("id", "${id}")
.queryParam("param1", "aaaaaa")
.queryParam("param2", "bbbbbb")
.queryParam("signature", session => sign(session, Map(
"id" -> session("id").as[String],
"param1" -> "aaaaaa",
"param2" -> "bbbbbb"))))
/* ... */
def sign(session: Session, params: Map[String, String]) : String = {
val str = canonicalize(params)
format_mac(session("secret").as[String], str)
}
However I have to duplicate all query parameter names and values in the sign method call and it is clearly a bad practice. It is possible to avoid that ?
You want to sign a request, so use a SignatureCalculator.
Related
I'm writing a load test for an api and want to create a feeder which generates random values to inject into the body of the POST request. I initially tried copying the random email example from the documentation and adding additional fields to the generated map, but when that didn't work I went down to a single field, basically copying the documentation; however, even this doesn't work for some reason. There are a bunch of solutions on here that use this syntax as well, but something about the way I'm doing is causing the fields I try to inject into the body to be null when the request is made.
Current Code:
val userFeeder: Iterator[Map[String, Unit]] =
Iterator.continually(Map("userName" -> ("user_" + Random.alphanumeric.take(15).mkString)))
var scn: ScenarioBuilder = scenario("GENERATE USER")
.feed(userFeeder)
.exec(
http("CREATE USER")
.post(userBaseUrl)
.headers(userHeaders)
.body(StringBody("userName: ${userName}")))
setUp(
scn.inject(atOnceUsers(1))
)
Ideally I'd like to be able to expand the feeder to include multiple values, i.e.
val userFeeder: Iterator[Map[String, Unit]] =
Iterator.continually(Map("userName" -> ("user_" + Random.alphanumeric.take(15).mkString),
"userEmail" -> (Random.alphanumeric.take(15).mkString) + "#random.edu"),
"address" -> Random.alphanumeric.take(15).mkString)))
and so on, but I'm a little stumped as to why my current code doesn't even work, as it seems to follow the documentation example pretty faithfully. The values are always null in my requests despite trying a few different strategies.
Log output
body:StringChunksRequestBody{contentType='application/json', charset=UTF-8, content=userName: ()}
Figured it out. Turns out that even though Feeder is a wrapper for Iterator, the proper way to do what I want is to declare it like this:
val userFeeder: Feeder[Any] =
Iterator.continually(Map("userName" -> ("user_" + Random.alphanumeric.take(15).mkString),
"userEmail" -> (Random.alphanumeric.take(15).mkString) + "#random.edu"),
"address" -> Random.alphanumeric.take(15).mkString)))
I am using 2 API calls in my Gatling simulation. One API returns the authentication token for the second, so I need to call the token generation API call only once during the execution and use it's generated token for the second API throughout the execution. But this works only for the first cycle of execution and the token that I have saved is not getting used for the remaining executions.
object KeycloakToken extends CMS {
def request(conf: ExecutionConfig): HttpRequestBuilder = {
http("Get Auth token from Keycloak")
.post(s"${conf.authUrl}/token")
.body(StringBody(""" {
"realm": "realm",
"clientId": "clientId",
"clientSecret": "clientSecret",
"grantType": "urn:ietf:params:oauth:grant-type:token-exchange",
"userName" : "userName"
} """)).asJson
.check(jsonPath("$.access_token").saveAs("token"))
}
}
object getOffers extends CMS {
def request(conf: ExecutionConfig): HttpRequestBuilder = {
http("getOffers")
.post(s"$context")
.body(StringBody(""" Body """)).asJson
.headers(headers)
.header("Authorization", s => s"Bearer ${s.attributes("token")}")
.check(jsonPath("$.data.offers.offers[0].id").exists)
}
}
execute.apply(
scenario("service")
.exec(session => session.set("counter" , myGlobalVar.getAndIncrement))
.doIf(session => session("counter").validate[Int].map(i => i == 0)) {
exec(KeycloakToken.request(conf)) //--call only once
}
.exec(getOffers.request(conf))
)
A gatling session object is unique to each user. So when you set your counter session variable as the first step of your scenario then use a doIf to only get the token if counter==0 only the first user to execute will ever try to get the token.
Since the session is unique to that user, none of the other users will have a value for token in their session object.
What you're trying to do seems to be a pretty common issue - make a single request to get some kind of data, then have that data shared among all the users. eg: here
Note that it looks like this kind of scenario will be easier once gatling 3.4
I'm trying to write middleware that would extract specific cookie and store information in ContextRequest.
Here is my test code:
def cookie[F[_]: Sync](
logger: Logger[F]
): Kleisli[F, Request[F], ContextRequest[F, Option[Cookie]]] =
Kleisli { request: Request[F] =>
for {
_ <- logger.debug(s"finding cookie")
_ <- logger.debug(request.cookies.map(_.name).mkString(","))
} yield ContextRequest(none[Cookie], request)
}
Then I use it like this:
def httpApp: HttpApp[F] = cookie(logger).mapK(OptionT.liftK).andThen(routesWithCookieContext).orNotFound
The problem is: request doesn't have any cookies even so I see them in the Chrome dev tools and in the request's details in the logs. What I'm doing wrong and how to make it work?
Turned out it was the problem with a cookie content. I was using Circle's .asJson.noSpaces to convert case class into string and write it into cookie's value. But for some reason cookies with json in their value doesn't work.
I am trying to create a performance test suite where i have array of ID's that will be picked in random. For each ID , there is a designated auth_token assigned .
In the protocol , if i pass the method where the random ID's would take , it always sets it to that particular ID for the entire operation .
I am expecting something like , i am defining 10 virtual users and for each user the protocol should change the ID and continue the scenario execution .
Currently Gatling is setting the protocol at the first and uses the same protocol for all the 10 users.
id = random.generate //generate random id
authHeader = Method(id);
def method (id:String) : String{
if(id=="id1")
return token1
else if(id=="id2")
return token2
""
}
val httpProtocol = http.baseUrl(baseURI)
.acceptHeader(header)
.authorizationHeader(authHeader)
.contentTypeHeader(contentType)
.userAgentHeader(agentHeader)
val scn1: ScenarioBuilder = scenario("name")
.exec(http("scenario1")
.post(device_context)
.body(payload)
.check(status.is(202)))
setUp(scn1.inject(atOnceUsers(2)).protocols(httpProtocol))```
In the above code i need the suite to run for 2 different id.
To make this work, you're going to have to use a session variable to hold your authHeader. The DSL methods define builders that are only executed once - which explains what you're seeing.
The best way to do this would be to construct a feeder to hold your ids and auth tokens (I'm assuming you're not using the id anywhere else)
So define a feeder that maps a key (just a string) to a map that contains the id and auth token
//a list of strings to hold the auth tokens
private val ids = List(Map("id" -> "id1", "auth" -> "token1"), Map("id" -> "id2", "auth" -> "token2"), ...)
//the feeder to put a random token into the session
private val idFeeder = Iterator.continually(Map("id" -> Random.shuffle(ids).head))
now when you call .feed on idFeeder you get a random Map that has keys for "id" and "auth" in the session variable "id"
so update your scenario to use the feeder and set an Authorization header (and remove .authorizationHeader from your protocol definition)
val scn1: ScenarioBuilder = scenario("name")
.feed(idFeeder)
.exec(http("scenario1")
.header("Authorization", "${id.auth})"
.post(device_context)
.body(payload)
.check(status.is(202)))
in your body you can access the user id string with "${id.id}"
alternatively you could update your protocol definition to have the ${id} reference, but I find it nicer to have the feeder value used in the same block as the call to .feed
I am trying to run a load test using Gatling 2. I need to generate one of the query parameters dynamically on each request.
My scenario is defined like this:
val scn = scenario("Load Test Scenario")
.exec(
http("Test API")
.post(url)
.body(StringBody("Some XML"))
.queryParam("x", DigestUtils.md5Hex(generateX().getBytes("UTF-8")))
)
def generateX() : String = {
// generate random string and return
}
This only calls generateX once and uses the result in each request. Is there anyway to have the generateX call on every request?
You have to pass a function, not a value. See Gatling documentation about Expression.
Here, you can just discard the session input parameter as you don't use it, so you can simply write:
.queryParam("x", _ => DigestUtils.md5Hex(generateX().getBytes("UTF-8")))