azihsoyn / gatling-grpc

A Gatling load test plugin for gRPC

Gatling-gRPC

A Gatling load test plugin for gRPC.

Usage

Because of gRPC's need of code generation, I assume you are running the tests using the SBT plugin. For a quickstart guide, see this Medium article.

To use this library, add this library to the test dependencies along with the two required by Gatling.

libraryDependencies ++= Seq(
  "io.gatling.highcharts" % "gatling-charts-highcharts" % gatlingVersion % "test",
  "io.gatling" % "gatling-test-framework" % gatlingVersion % "test",
  "com.github.phisgr" %% "gatling-grpc" % "0.7.0" % "test"
)
enablePlugins(GatlingPlugin)

For setting up the code generation, see the documentation in ScalaPB.

If your protobuf files are in src/test/protobuf instead of src/main/protobuf, change Compile to Test.

PB.targets in Test := Seq(
  scalapb.gen() -> (sourceManaged in Test).value
)

To make a gRPC call:

exec(
  grpc("my_request")
    .rpc(GreetServiceGrpc.METHOD_GREET)
    .payload(HelloWorld(
      username = "myUserName",
      name = "My name"
    ))
)

For a complete demo and various examples, see GrpcExample in test.

Dynamic Payload

There are helper methods in gatling-grpc for generating dynamic ScalaPB objects with Lenses, as demonstrated in the example linked above. If you want to use Java Protobuf classes, you can use the gatling-javapb library.

Logging

In logback.xml, add
<logger name="com.github.phisgr.gatling.grpc" level="DEBUG" />
to log the requests and responses that are failed (KO in Gatling) and with a non-OK gRPC status code.

Development

sbt clean coverage test gatling:test coverageReport for a coverage report.
sbt bench/clean 'bench/jmh:run -i 10 -wi 5 -f1 -t1' for JMH tests.