Packages

object Tracer extends StringSyntax

org.http4s.server.HttpMiddleware that either tries to get a Trace-Id from the headers or otherwise creates one with a unique Time-based UUID value, adds it to the headers and logs the http request and http response with it.

Quite useful to trace the flow of each request. For example:

[TraceId] - [72b079c8-fc92-4c4f-aa5a-c0cd91ea221c] - Request(method=GET, uri=/users, ...) [TraceId] - [72b079c8-fc92-4c4f-aa5a-c0cd91ea221c] - UserAlgebra requesting users [TraceId] - [72b079c8-fc92-4c4f-aa5a-c0cd91ea221c] - UserRepository fetching users from DB [TraceId] - [72b079c8-fc92-4c4f-aa5a-c0cd91ea221c] - MetricsService saving users metrics [TraceId] - [72b079c8-fc92-4c4f-aa5a-c0cd91ea221c] - Response(status=200, ...)

In a normal application, you will have thousands of requests and tracing the call chain in a failure scenario will be invaluable.

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StringSyntax, AnyRef, Any
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Type Members

  1. final case class TraceId(value: String) extends AnyVal with Product with Serializable

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. def apply[F[_]](implicit ev: Tracer[F]): Tracer[F]
  5. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  6. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  7. def create[F[_]](headerName: String = DefaultTraceIdHeader): Tracer[F]
  8. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  9. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  10. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  11. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  12. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  13. implicit def http4sStringSyntax(s: String): StringOps
    Definition Classes
    StringSyntax
  14. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  15. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  16. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  17. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  18. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  19. def toString(): String
    Definition Classes
    AnyRef → Any
  20. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  21. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  22. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()

Inherited from StringSyntax

Inherited from AnyRef

Inherited from Any

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