Custom reporters
It’s possible to create OpenTracing compatible tracers programmatically, by providing a Cinnamon TracerFactory
that creates the Tracer
directly. Also, there is a TracerSpecific
class to implement, and a TracerSpecificFactory
marker interface to use.
For example, the LightStep Tracer can be used by implementing a TracerFactory
such as:
package sample {
import com.lightbend.cinnamon.logging.LoggingProvider
import com.lightbend.cinnamon.opentracing.{ TracerFactory, TracerSpecific, TracerSpecificFactory }
import com.typesafe.config.Config
import io.opentracing.{ SpanContext, Tracer }
/**
* Optional parameters for an implementation of a TracerFactory (in this specific order):
*
* @param configPath
* path to section in config for the tracer, e.g. `cinnamon.opentracing.lightstep`
* @param config
* the configuration for this `ActorSystem`
* @param loggingProvider
* a Cinnamon `LoggingProvider`
*/
class LightStepTracerFactory(configPath: String, config: Config, loggingProvider: LoggingProvider) extends TracerFactory with TracerSpecificFactory {
def create(): Tracer = {
new com.lightstep.tracer.jre.JRETracer(
new com.lightstep.tracer.shared.Options.OptionsBuilder()
.withAccessToken("{your_access_token}")
.build()
)
}
def createTracerSpecific(): TracerSpecific = {
new LightstepTracerSpecific
}
}
class LightstepTracerSpecific extends TracerSpecific {
def isSampled(context: SpanContext): Boolean = {
// always sampled for lightstep
true
}
def isDebug(context: SpanContext): Boolean = {
// could add debug trace integration here...
false
}
}
}
Make sure that you add the Cinnamon OpenTracing module dependency to your build file:
- sbt
-
libraryDependencies += Cinnamon.library.cinnamonOpenTracing
- Maven
-
<dependency> <groupId>com.lightbend.cinnamon</groupId> <artifactId>cinnamon-opentracing_2.13</artifactId> <version>2.21.2</version> </dependency>
- Gradle
-
dependencies { implementation group: 'com.lightbend.cinnamon', name: 'cinnamon-opentracing_2.13', version: '2.21.2' }
And then configuring Cinnamon to use this tracer:
cinnamon.opentracing {
tracers = [lightstep]
lightstep {
debug = on
factory-class = "sample.LightStepTracerFactory"
}
}
Adding the debug = on
setting into the tracer config during development will help to debug issues if any occur during the custom tracer creation. Also make sure that the Cinnamon loglevel is set to DEBUG
.
Cinnamon currently staying on 0.32
to be compatible across tracers, Datadog tracer in particular.