https://github.com/christopherdavenport/log4cats-mtl

Log4cats MTL Integration Layer
https://github.com/christopherdavenport/log4cats-mtl

Last synced: about 1 month ago
JSON representation

Log4cats MTL Integration Layer

• Host: GitHub
• URL: https://github.com/christopherdavenport/log4cats-mtl
• Owner: ChristopherDavenport
• License: mit
• Created: 2019-09-30T13:45:34.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2019-10-04T20:38:27.000Z (about 5 years ago)
• Last Synced: 2023-07-03T20:05:59.864Z (over 1 year ago)
• Language: Scala
• Homepage: https://christopherdavenport.github.io/log4cats-mtl
• Size: 319 KB
• Stars: 3
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE
  • Code of conduct: CODE_OF_CONDUCT.md

Awesome Lists containing this project

README

        
# log4cats-mtl - Log4cats MTL Integration Layer [![Build Status](https://travis-ci.com/ChristopherDavenport/log4cats-mtl.svg?branch=master)](https://travis-ci.com/ChristopherDavenport/log4cats-mtl) [![Maven Central](https://maven-badges.herokuapp.com/maven-central/io.chrisdavenport/log4cats-mtl_2.12/badge.svg)](https://maven-badges.herokuapp.com/maven-central/io.chrisdavenport/log4cats-mtl_2.12) ![Code of Consuct](https://img.shields.io/badge/Code%20of%20Conduct-Scala-blue.svg)

## [Head on over to the microsite](https://ChristopherDavenport.github.io/log4cats-mtl)

## Quick Start

To use log4cats-mtl in an existing SBT project with Scala 2.12 or a later version, add the following dependencies to your

`build.sbt` depending on your needs:

```scala

libraryDependencies ++= Seq(

  "io.chrisdavenport" %% "log4cats-mtl" % ""

)

```

## Examples

```scala

import io.chrisdavenport.log4cats.extras.LogMessage

import io.chrisdavenport.log4cats.slf4j.Slf4jLogger

import io.chrisdavenport.log4cats.mtl._

import cats._

import cats.data._

import cats.effect.Sync

import cats.implicits._

import cats.mtl._

import cats.mtl.implicits._

final case class TraceId(value: String)

implicit val traceIdCtxEncoder: CtxEncoder[TraceId] = (traceId: TraceId) => Map("traceId" -> traceId.value)

def doApplicativeLocalThings[F[_]: Sync: ApplicativeLocal[?[_], TraceId]]: F[Unit] = 

  (for {

    logger <- ApplicativeAskLogger.create[F, TraceId](Slf4jLogger.create[F])

    _ <- logger.info("Logging at start of safelyDoThings").scope(TraceId("inner-id"))

    something <- Sync[F].delay(println("I could do anything"))

      .onError{case e => logger.error(e)("Something Went Wrong in safelyDoThings")}

    _ <- logger.info("Logging at end of safelyDoThings")

  } yield something).scope(TraceId("outter-id"))

  

def doFunctorTellThings[F[_]: Sync: FunctorTell[?[_], Chain[LogMessage]]]: F[Unit] = {

  val logger = FunctorTellLogger[F, Chain]()

  for {

    _ <- logger.info("Logging at start of safelyDoThings")

    something <- Sync[F].delay(println("I could do anything"))

      .onError{case e => logger.error(e)("Something Went Wrong in safelyDoThings")}

    _ <- logger.info("Logging at end of safelyDoThings")

  } yield something

}

```