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/* =========================================================================================
* Copyright © 2013-2017 the kamon project <http://kamon.io/>
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the
* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific language governing permissions
* and limitations under the License.
* =========================================================================================
*/
package kamon.trace
import java.time.Instant
import com.typesafe.config.ConfigFactory
import kamon.Kamon
import kamon.context.Context
import kamon.testkit.{SpanBuilding, SpanInspection}
import kamon.trace.Span.TagValue
import kamon.trace.SpanContext.SamplingDecision
import org.scalatest.{Matchers, OptionValues, WordSpec}
class TracerSpec extends WordSpec with Matchers with SpanBuilding with SpanInspection with OptionValues {
"the Kamon tracer" should {
"construct a minimal Span that only has a operation name" in {
val span = tracer.buildSpan("myOperation").start()
val spanData = inspect(span)
spanData.operationName() shouldBe "myOperation"
spanData.metricTags() shouldBe empty
spanData.spanTags() shouldBe empty
}
"pass the operation name and tags to started Span" in {
val span = tracer.buildSpan("myOperation")
.withMetricTag("metric-tag", "value")
.withMetricTag("metric-tag", "value")
.withTag("hello", "world")
.withTag("kamon", "rulez")
.withTag("number", 123)
.withTag("boolean", true)
.start()
val spanData = inspect(span)
spanData.operationName() shouldBe "myOperation"
spanData.metricTags() should contain only (
("metric-tag" -> "value"))
spanData.spanTags() should contain allOf(
("hello" -> TagValue.String("world")),
("kamon" -> TagValue.String("rulez")),
("number" -> TagValue.Number(123)),
("boolean" -> TagValue.True))
}
"not have any parent Span if there is no Span in the current context and no parent was explicitly given" in {
val span = tracer.buildSpan("myOperation").start()
val spanData = inspect(span)
spanData.context().parentID shouldBe IdentityProvider.NoIdentifier
}
"automatically take the Span from the current Context as parent" in {
val parent = tracer.buildSpan("myOperation").start()
val child = Kamon.withSpan(parent) {
tracer.buildSpan("childOperation").asChildOf(parent).start()
}
val parentData = inspect(parent)
val childData = inspect(child)
parentData.context().spanID shouldBe childData.context().parentID
}
"ignore the span from the current context as parent if explicitly requested" in {
val parent = tracer.buildSpan("myOperation").start()
val child = Kamon.withSpan(parent) {
tracer.buildSpan("childOperation").ignoreParentFromContext().start()
}
val childData = inspect(child)
childData.context().parentID shouldBe IdentityProvider.NoIdentifier
}
"allow overriding the start timestamp for a Span" in {
val span = tracer.buildSpan("myOperation").withFrom(Instant.EPOCH.plusMillis(321)).start()
val spanData = inspect(span)
spanData.from() shouldBe Instant.EPOCH.plusMillis(321)
}
"preserve the same Span and Parent identifier when creating a Span with a remote parent if join-remote-parents-with-same-span-id is enabled" in {
val previousConfig = Kamon.config()
Kamon.reconfigure {
ConfigFactory.parseString("kamon.trace.join-remote-parents-with-same-span-id = yes")
.withFallback(Kamon.config())
}
val remoteParent = Span.Remote(createSpanContext())
val childData = inspect(tracer.buildSpan("local").asChildOf(remoteParent).start())
childData.context().traceID shouldBe remoteParent.context.traceID
childData.context().parentID shouldBe remoteParent.context.parentID
childData.context().spanID shouldBe remoteParent.context.spanID
Kamon.reconfigure(previousConfig)
}
"propagate sampling decisions from parent to child spans, if the decision is known" in {
val sampledRemoteParent = Span.Remote(createSpanContext().copy(samplingDecision = SamplingDecision.Sample))
val notSampledRemoteParent = Span.Remote(createSpanContext().copy(samplingDecision = SamplingDecision.DoNotSample))
tracer.buildSpan("childOfSampled").asChildOf(sampledRemoteParent).start().context()
.samplingDecision shouldBe(SamplingDecision.Sample)
tracer.buildSpan("childOfNotSampled").asChildOf(notSampledRemoteParent).start().context()
.samplingDecision shouldBe(SamplingDecision.DoNotSample)
}
"take a sampling decision if the parent's decision is unknown" in {
val previousConfig = Kamon.config()
Kamon.reconfigure {
ConfigFactory.parseString("kamon.trace.sampler = always")
.withFallback(Kamon.config())
}
val unknownSamplingRemoteParent = Span.Remote(createSpanContext().copy(samplingDecision = SamplingDecision.Unknown))
tracer.buildSpan("childOfSampled").asChildOf(unknownSamplingRemoteParent).start().context()
.samplingDecision shouldBe(SamplingDecision.Sample)
Kamon.reconfigure(previousConfig)
}
}
val tracer: Tracer = Kamon
}
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