HaydenMeloche / khealth

A simple and customizable health plugin for Ktor

KHealth

Khealth is a simple & customizable health plugin for Ktor.

As of KHealth version 2.0.0, Ktor 2 is only supported

Usage

import dev.hayden.KHealth

fun main(args: Array<String>) {
  embeddedServer(Netty, 80) {
    install(KHealth)
  }.start(wait = true)
}

This will configure a /ready and a /health endpoint both returning a 200 status code.

KHealth also supports adding custom checks to both the ready and health endpoints.

import dev.hayden.KHealth

fun main(args: Array<String>) {
  embeddedServer(Netty, 80) {
    install(KHealth) {
      readyChecks {
        check("check my database is up") {
          myDatabase.ping()
        }
      }
      healthChecks {
        check("another check") { true }
      }
    }
  }.start(wait = true)
}

A GET /ready call would return

{
  "check my database is up": true
}

and a 200 status code.

If any provided checks return false then a 500 would be returned.

If you'd like to override the default status codes, that can be done by overriding the default values.

import dev.hayden.KHealth

fun main(args: Array<String>) {
  embeddedServer(Netty, 80) {
    install(KHealth) { 
      successfulCheckStatusCode = HttpStatusCode.Accepted
      unsuccessfulCheckStatusCode = HttpStatusCode.ExpectationFailed
    }
  }.start(wait = true)
}

The health endpoint and ready endpoint can both be disabled using the healthCheckEnabled and readyCheckEnabled properties.

import dev.hayden.KHealth

fun main(args: Array<String>) {
  embeddedServer(Netty, 80) {
    install(KHealth) {
      readyCheckEnabled = false
      healthCheckEnabled = false
    }
  }.start(wait = true)
}

If you need to override the default URI paths, that can be done too.

import dev.hayden.KHealth

fun main(args: Array<String>) {
  embeddedServer(Netty, 80) {
    install(KHealth) {
      readyCheckPath = "newready"
      healthCheckPath = "/newhealth"
    }
  }.start(wait = true)
}

For more advanced configurations, KHealth accepts a Ktor Route allowing you to wrap the routes created by KHealth. An example of this is shown below adding basic authentication to the KHealth endpoints.

authentication {
  basic(name = "basic auth") {
    validate { credentials ->
      // your logic here
    }
  }
}
install(KHealth) {
  wrap {
    // wrap our KHealth endpoints with an authentication block
    authenticate("basic auth", optional = false, build = it)
  }
}

Installation

KHealth uses Jitpack as its repository. This means you will need to add a custom repository for Jitpack if you don't already have it.

For Maven:

<repositories>
  <repository>
    <id>jitpack.io</id>
    <url>https://jitpack.io</url>
  </repository>
</repositories>

<dependency>
  <groupId>dev.hayden</groupId>
  <artifactId>khealth</artifactId>
  <version>2.1.1</version>
</dependency>

For gradle:

allprojects {
  repositories {
    maven { url 'https://jitpack.io' }
  }
}

dependencies {
  implementation 'dev.hayden:khealth:2.1.1'
}

For additional build systems check out: https://jitpack.io/#dev.hayden/khealth