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middleware.clj
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middleware.clj
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(ns telemetry.middleware
(:require [telemetry.tracing :as tracing]
[clojure.string :as string]))
(defn event-fn-skip-probe
[req]
(let [user-agent (get-in req [:headers "user-agent"])]
(if (and user-agent
(string/includes? user-agent "probe"))
false
true)))
(defn wrap-telemetry-tracing
([handler]
(wrap-telemetry-tracing handler nil))
([handler options]
(fn [req]
(let [event-fn (:event-fn options event-fn-skip-probe)]
(if (and event-fn
(event-fn req)
(:tracer options))
(let [span (tracing/create-span (:tracer options))
method (:request-method req)
uri (:uri req)
msg (format "HTTP %s %s Begin" (string/upper-case (name method)) uri)]
(try
(tracing/add-event span msg)
(handler (assoc req :span span))
(finally
(tracing/end-span span))))
(handler req))))))