[#159] Add Slack appender (@sbelak)

src/taoensso/timbre/appenders/3rd_party/slack.clj

@@ -0,0 +1,28 @@
+(ns taoensso.timbre.appenders.3rd-party.slack
+  {:author "Simon Belak (@sbelak)"}
+  (:require (taoensso [timbre :as timbre]
+                      [encore :as encore])
+            (clj-slack [chat :as slack.chat]              
+                       [core :as slack])))
+
+(defn slack-appender
+  "Return Slack appender.
+  Required params: 
+  `token` - Slack API token. See: Browse apps > Custom Integrations > Bots
+  `channel` - Channel ID. 
+
+  Optional params: same as clj-slack.chat/post-message `optionals`. See: http://julienblanchard.com/clj-slack/clj-slack.chat.html"
+  [& [opts]]
+  (let [{:keys [token channel]} opts
+        conn {:api-url "https://slack.com/api"
+              :token token}]
+    {:enabled?   true 
+     :async?     true 
+     :min-level  nil
+     :rate-limit [[1 (encore/ms :secs 1)]]
+     :output-fn :inherit 
+     :fn
+     (fn [data]
+       (let [{:keys [output-fn]} data]
+         (slack.chat/post-message conn channel (output-fn data)
+                                  (dissoc opts :token :channel))))}))