问题描述
我想以与https://aspects.jcabi.com/apidocs-0.22.6/com/jcabi/aspects/Loggable.html相同的想法在我们的应用程序中设置可记录工具 由于我的团队无论如何都将使用kamon和Kanela在我们的代码库中传播上下文，因此如果由同一个代理执行所有检测工作，对我们而言将更加简单。
所以我想我会自己动手做，并在我们的单声道仓库中启动一个新项目，以拥有一个可记录kamon的模块。我查看了kamon-annotation和kamon-annotation-api代码，以获取有关如何执行此操作的灵感。我发现的唯一文档（http://kamon-io.github.io/kanela/interceptors.html）并不是很有用，并且我对ByteBudy的了解几乎为零...但是开始时使用cameleon编码就足够了：）
我到达了一个看起来不错的地方，可以编译，但是在运行时，没有日志，并且代码似乎也没有执行。代码中的断点从未到过，但可能是正常的，我不确定该类是否在检测后实际实例化，或者代码是否在其他类中内联复制。
任何关于如何设置项目的建议（不要双关语），或者缺少任何建议，将不胜感激。我想这与我的build.sbt或conf文件有关，但是我暂时还停留在...
build.sbt
// scala_common project contains the @com.company.logging.Loggable annotation declaration
// java project (but compiled as scala ?)
// nothing in the assembly,because no Main to be executed
lazy val loggable = (project in file("common/scala-kamon-loggable"))
.enablePlugins(JavaAgent)
.assembly("","scala-kamon-loggable.jar")
.dependsOn(scala_common)
.settings(
javaAgents := Seq("io.kamon" % "kanela-agent" % "1.0.7" % "runtime")
)
.settings(
libraryDependencies ++= Seq(
"io.kamon" %% "kamon-core" % "2.1.4","io.kamon" %% "kamon-annotation" % "2.1.4"
)
)
// the main I execute to test
lazy val logging_poc = (project in file("applications/logging-poc"))
.assembly("com.company.logging.Poc","logging-poc.jar")
.dependsOn(scala_common,loggable)
.settings(
libraryDependencies ++= Seq(
"io.kamon" %% "kamon-core" % "2.1.4","io.kamon" %% "kamon-scala-future" % "2.1.4","io.kamon" %% "kamon-logback" % "2.1.4"
)
)
scala-common
- com.company.logging.Loggable
import java.lang.annotation.*;
/**
* When instrumentation is activated,log all entry / return / throw of the annotated method
*/
@Documented
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Loggable {}
scala-kamon-loggable
- reference.conf
kanela.modules {
loggable {
enabled = true
name = "Loggable Annotation Instrumentation"
description = "Provides an annotation to create tracing Logs of annotated methods"
instrumentations = [
"com.company.logging.Instrumentation"
]
}
}
- com.company.logging.Instrumentation
public final class Instrumentation extends InstrumentationBuilder {
private static final String Loggable = "com.company.logging.Loggable";
public Instrumentation() {
onTypesWithMethodsAnnotatedWith(Loggable)
.advise(isAnnotatedWith(named(Loggable)),LoggableAdvisor.class);
}
}
- com.company.logging.advisor.LoggableAdvisor
public final class LoggableAdvisor {
public final static ExecutionContext CallingThreadEC = CallingThreadExecutionContext$.MODULE$;
@Advice.OnMethodEnter()
public static void onEnter(
@Advice.This(optional = true) Object obj,@Advice.Origin Class<?> clazz,@Advice.Origin Method method,@Advice.Origin("#t") String className,@Advice.Origin("#m") String methodName,@Advice.Origin("#s") String signatureName,@Advice.AllArguments Object[] allArguments
) {
// I'd put a Logger after,for Now,just for testing instrumentation,println is enough
System.out.println("INSIDE INSTRUMENTATION");
}
}
logging_poc
- application.conf
kamon {
trace {
tick-interval = 2 seconds
sampler = "always"
}
enabled: true
}
- com.company.logging.Poc
object Poc extends App with LazyLogging {
val config = ConfigFactory.load()
if (config.getBoolean("kamon.enabled")) {
kamon.loadModules()
}
import scala.concurrent.ExecutionContext.Implicits.global
@com.company.logging.Loggable
def asyncLog(param: Integer): Future[String] = {
kamon.runWithSpan(kamon.spanBuilder("Level 3").start(),finishSpan = true) {
Future {
blocking {
assert(param < 5,"Param is too big")
Thread.sleep(param * 1000)
logger.info(s"Some info logs ! ($param)")
"Ok"
}
}
}
}
Await.ready( asyncLog(0),Duration.Inf)
Await.ready(kamon.stopModules(),Duration.Inf)
}
这是我在控制台中获得的跟踪（其他检测工作，如我们在MDC中看到的SpanId）。 我本来希望在“某些信息日志！”之前得到“ INSIDE INSTRUMENTATION”行。
_ __ _ ______
| |/ / | | \ \ \ \
| ' / __ _ _ __ ___| | __ _ \ \ \ \
| < / _` | '_ \ / _ \ |/ _` | ) ) ) )
| . \ (_| | | | | __/ | (_| | / / / /
|_|\_\__,_|_| |_|\___|_|\__,_| /_/_/_/
==============================
Running with Kanela,the kamon Instrumentation Agent ::
scala-execution-context-global-18 10:53:14.582 [INFO ] com.company.logging.Poc$ - Some info logs ! (0) - MDC[kamonSpanId=0b64e07a7ec37656,kamonTraceId=c347442849cccd86,kamonSpanName=Level 3]
Process finished with exit code 0
解决方法
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