2021-06-03 12:40:22 +02:00

100 lines
2.8 KiB
Clojure

;; This Source Code Form is subject to the terms of the Mozilla Public
;; License, v. 2.0. If a copy of the MPL was not distributed with this
;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
;;
;; Copyright (c) UXBOX Labs SL
(ns app.loggers.loki
"A Loki integration."
(:require
[app.common.spec :as us]
[app.config :as cfg]
[app.util.async :as aa]
[app.util.http :as http]
[app.util.json :as json]
[app.util.logging :as l]
[app.worker :as wrk]
[clojure.core.async :as a]
[clojure.spec.alpha :as s]
[integrant.core :as ig]))
(declare handle-event)
(s/def ::uri ::us/string)
(s/def ::receiver fn?)
(defmethod ig/pre-init-spec ::reporter [_]
(s/keys :req-un [::wrk/executor ::receiver]
:opt-un [::uri]))
(defmethod ig/init-key ::reporter
[_ {:keys [receiver uri] :as cfg}]
(when uri
(l/info :msg "intializing loki reporter" :uri uri)
(let [input (a/chan (a/dropping-buffer 512))]
(receiver :sub input)
(a/go-loop []
(let [msg (a/<! input)]
(if (nil? msg)
(l/info :msg "stoping error reporting loop")
(do
(a/<! (handle-event cfg msg))
(recur)))))
input)))
(defmethod ig/halt-key! ::reporter
[_ output]
(when output
(a/close! output)))
(defn- prepare-payload
[event]
(let [labels {:host (cfg/get :host)
:tenant (cfg/get :tenant)
:version (:full cfg/version)
:logger (:logger event)
:level (:level event)}]
{:streams
[{:stream labels
:values [[(str (* (inst-ms (:created-at event)) 1000000))
(str (:message event)
(when-let [error (:error event)]
(str "\n" (:trace error))))]]}]}))
(defn- send-log
[uri payload i]
(try
(let [response (http/send! {:uri uri
:timeout 6000
:method :post
:headers {"content-type" "application/json"}
:body (json/encode payload)})]
(cond
(= (:status response) 204)
true
(= (:status response) 400)
(do
(l/error :hint "error on sending log to loki (no retry)"
:rsp (pr-str response))
true)
:else
(do
(l/error :hint "error on sending log to loki" :try i
:rsp (pr-str response))
false)))
(catch Exception e
(l/error :hint "error on sending message to loki" :cause e :try i)
false)))
(defn- handle-event
[{:keys [executor uri]} event]
(aa/with-thread executor
(let [payload (prepare-payload event)]
(loop [i 1]
(when (and (not (send-log uri payload i)) (< i 20))
(Thread/sleep (* i 2000))
(recur (inc i)))))))