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Wingtips - zipkin2-spring-boot2-webflux

Wingtips is a distributed tracing solution for Java based on the Google Dapper paper.

This module is a plugin extension module of the core Wingtips library and contains support for distributed tracing in a Spring Boot 2 WebFlux environment with Zipkin integration.

NOTE: This module only works with Spring Boot projects that are based on Spring WebFlux, not Spring Web MVC (Servlet-based). If you're looking for Wingtips + Spring Web MVC (Servlet) based Spring Boot + Zipkin support, see the wingtips-zipkin2-spring-boot module instead.

Usage Examples

NOTES:

  • The Wingtips Spring Boot 2 WebFlux sample project shows these features in action.
  • The wingtips-zipkin2 module readme contains more details on the core Wingtips-with-Zipkin integration features.
  • All of the features of the wingtips-spring-webflux module are relevant to a Spring Boot WebFlux project as well - please see that module's readme for more info on its features.
  • More details can be found in the javadocs for the various classes found in this wingtips-zipkin2-spring-boot2-webflux module.

Utilizing WingtipsWithZipkinSpringBoot2WebfluxConfiguration in a Spring Boot application to configure and setup Wingtips tracing with Zipkin integration

Ensure that the following @Configuration gets registered in your Spring Boot app's ApplicationContext:

@Configuration
@Import(WingtipsWithZipkinSpringBoot2WebfluxConfiguration.class)
public class MyAppSpringConfig {
}

And specify configuration in your Spring Boot app's application.properties (note that all properties are optional except wingtips.zipkin.base-url, which is required if you want the Zipkin integration to work - that said, it's highly recommended that you also at least specify wingtips.zipkin.service-name):

# General Wingtips config
wingtips.wingtips-disabled=false
wingtips.user-id-header-keys=userid,altuserid
wingtips.span-logging-format=KEY_VALUE 
wingtips.server-side-span-tagging-strategy=ZIPKIN
# Leave tagging adapter property blank to use the default SpringWebfluxServerRequestTagAdapter
wingtips.server-side-span-tagging-adapter=

# Zipkin integration config for Wingtips
wingtips.zipkin.zipkin-disabled=false
wingtips.zipkin.base-url=http://localhost:9411
wingtips.zipkin.service-name=some-service-name

Overriding the default Zipkin Reporter

By default, the WingtipsToZipkinLifecycleListener that gets registered (when you use WingtipsWithZipkinSpringBoot2WebfluxConfiguration) is setup with a Zipkin AsyncReporter that uses a basic URLConnectionSender to send span data to Zipkin over HTTP. You can easily override this Reporter by exposing a Reporter bean somewhere in your Spring app config:

@Bean
public Reporter<zipkin2.Span> zipkinReporterOverride() {
    // Generate whatever Zipkin Reporter you want Wingtips to use for sending span data to Zipkin.
    Reporter<zipkin2.Span> myReporter = ...; 
    return myReporter;
}

If WingtipsWithZipkinSpringBoot2WebfluxConfiguration detects a non-null Zipkin Reporter bean, then that Reporter will be used. If no Reporter override is present, then the default AsyncReporter with URLConnectionSender will be created and used.

Overriding the default WingtipsToZipkinSpanConverter

By default, the WingtipsToZipkinSpanConverter that gets registered (when you use WingtipsWithZipkinSpringBoot2WebfluxConfiguration) is a WingtipsToZipkinSpanConverterDefaultImpl. You can easily override this by exposing a WingtipsToZipkinSpanConverter bean somewhere in your Spring app config:

@Bean
public WingtipsToZipkinSpanConverter wingtipsToZipkinSpanConverterOverride() {
    // Generate whatever WingtipsToZipkinSpanConverter you want for converting Wingtips spans to Zipkin spans.
    WingtipsToZipkinSpanConverter myConverter = ...; 
    return myConverter;
}

If WingtipsWithZipkinSpringBoot2WebfluxConfiguration detects a non-null WingtipsToZipkinSpanConverter bean, then that WingtipsToZipkinSpanConverter will be used. If no WingtipsToZipkinSpanConverter override is present, then the default WingtipsToZipkinSpanConverterDefaultImpl will be created and used.

Feature details

This wingtips-zipkin2-spring-boot2-webflux module contains the following features/classes:

  • WingtipsWithZipkinSpringBoot2WebfluxConfiguration - A Spring @Configuration bean that uses @EnableConfigurationProperties to pull in WingtipsZipkinProperties (described below) and uses those properties to set up the following Wingtips-with-Zipkin features:
    • Registers a WingtipsToZipkinLifecycleListener with Wingtips' Tracer so that Wingtips spans are automatically sent to your Zipkin server as they are completed.
    • This class itself does a @Import(WingtipsSpringBoot2WebfluxConfiguration.class), so all the config features defined in the wingtips-spring-boot2-webflux readme are automatically supported here. The usage example above shows that support via the wingtips.wingtips-disabled, wingtips.user-id-header-keys, and wingtips.span-logging-format properties which are specific to WingtipsSpringBoot2WebfluxConfiguration. The remaining wingtips.zipkin.* properties are specific to this module's WingtipsWithZipkinSpringBoot2WebfluxConfiguration.
  • WingtipsZipkinProperties - The Spring Boot @ConfigurationProperties companion for WingtipsWithZipkinSpringBoot2WebfluxConfiguration (described above) that allows you to customize some Wingtips-with-Zipkin integration behaviors from your Spring Boot application's properties files. See the Spring Boot 2 WebFlux sample application's application.properties for a concrete example. The following properties are supported:
    • wingtips.zipkin.zipkin-disabled - Disables registering WingtipsToZipkinLifecycleListener with Wingtips if and only if this property value is set to true. If false or missing then WingtipsToZipkinLifecycleListener will be registered normally (as long as wingtips.zipkin.base-url is specified).
    • wingtips.zipkin.base-url - (REQUIRED) The base URL of the Zipkin server to send Wingtips spans to. This is the only property that is required for WingtipsWithZipkinSpringBoot2WebfluxConfiguration to be able to setup the Zipkin integration - if this is missing then WingtipsToZipkinLifecycleListener will not be registered. See the Zipkin quickstart page for info on how to easily setup a local Zipkin server for testing (can be done with a single docker command).
    • wingtips.zipkin.service-name - The name of this service, used when sending Wingtips spans to Zipkin. See the wingtips-zipkin2 readme for details on how this service name is used. If you don't set this property then "unknown" will be used. It's highly recommended that you specify this property even though it's technically optional.

For general Wingtips information please see the base project README.md.

NOTE - org.springframework:spring-webflux and org.springframework.boot:spring-boot-autoconfigure dependencies required at runtime

This module does not export any transitive Spring or Spring Boot dependencies to prevent version conflicts with whatever Spring Boot environment you're running in.

This should not affect most users since this library is likely to be used in a Spring Boot environment where the spring-webflux and spring-boot-autoconfigure dependencies are already on the classpath at runtime, however if you receive class-not-found errors related to classes found in spring-webflux or spring-boot-autoconfigure then you'll need to pull the org.springframework:spring-webflux and/or org.springframework.boot:spring-boot-autoconfigure dependencies into your project. Library authors who wish to build on functionality in this module might need to do this.

This module was built using version 5.1.9.RELEASE of spring-webflux, and version 2.1.8.RELEASE of spring-boot-autoconfigure, but many other versions of Spring and Spring Boot should work fine, both older and newer.