opentracing-clj example with Jaeger

README.md

Run Jaeger's all-in-one using Docker. See: https://www.jaegertracing.io/docs/1.14/getting-started/.

docker run --rm --name jaeger -p6831:6831/udp -p16686:16686 jaegertracing/all-in-one:latest

Run the example opentracing-clj project using the Clojure CLI. Note the environment variables set for usage with testing Jaeger tracing.

JAEGER_SAMPLER_TYPE=const JAEGER_SAMPLER_PARAM=1 JAEGER_SERVICE_NAME=example-service clj -m example

Navigate to the Jaeger UI at http://localhost:16686 to inspect the sample trace. Multiple runs of the example clojure script will create additional traces.

deps.edn

{:deps {opentracing-clj                {:mvn/version "0.1.5"}
        ;; https://github.com/jaegertracing/jaeger-client-java
        io.jaegertracing/jaeger-client {:mvn/version "0.32.0"}}
 :paths ["."]}

example.clj

(ns example
  (:require [opentracing-clj.core :as tracing])
  (:import
   (io.opentracing.contrib.tracerresolver TracerResolver)
   (io.opentracing.util GlobalTracer)))

(defn sleep
  [secs]
  (Thread/sleep secs))

(defn init-tracer!
  []
  (when-not (GlobalTracer/isRegistered)
    ;; Adding the Jaeger Tracing library configures OpenTracing's TracerResolver to use the Jaeger Java Client.
    (GlobalTracer/register (TracerResolver/resolveTracer))))

(defn -main []
  (init-tracer!)
  (tracing/with-span [outer {:name "outer"}]
    (println "Sleeping for 1 second ...")
    (Thread/sleep 1000)
    (tracing/with-span [inner {:name "inner"}]
      (println "Sleeping for 2 second ...")
      (Thread/sleep 2000)
      (println "Inner end."))
    (println "Sleeping for 3 second ...")
    (Thread/sleep 3000)
    (println "Outer end.")))