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Signed-off-by: Peter Taoussanis <p.taoussanis@gmail.com> |
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src/timbre | ||
.gitignore | ||
README.md | ||
epl-v10.html | ||
project.clj |
README.md
Timbre, a (sane) logging library for Clojure
Logging with Java can be maddeningly, unnecessarily hard. Particularly if all you want is something simple that works out the box.
tools.logging helps, but it doesn't save you from the mess of logger dependencies and configuration hell.
Timbre is an attempt to make simple logging simple and more complex logging possible.
What's In The Box?
- Small, uncomplicated all-Clojure library.
- Map-based config: no arcane XML or properties files.
- Decent performance (low overhead).
- Flexible fn-centric appender model.
- Sensible built-in appenders including simple email appender.
- Tunable flood control.
- Asynchronous logging support.
Status
Timbre was built in a day after I finally lost my patience trying to configure Log4j. I tried to keep the design simple and sensible but I didn't spend much time thinking about it so there may still be room for improvement. In particular the configuration and appender formats are still subject to change.
Getting Started
Leiningen
Depend on [timbre "0.5.1-SNAPSHOT"]
in your project.clj
and use
the library:
(ns my-app
(:use [timbre.core :as timbre :only (trace debug info warn error fatal spy)])
Start Logging
By default, Timbre gives you basic print output to *out*
/*err*
at a debug
logging level:
(info "This will print")
=> 2012-May-28 17:26:11:444 +0700 INFO [timbre.tests] - This will print
(trace "This won't print due to insufficient logging level")
=> nil
There's little overhead for checking logging levels:
(time (trace (Thread/sleep 5000)))
=> "Elapsed time: 0.054 msecs"
(time (when true))
=> "Elapsed time: 0.051 msecs"
First-argument exceptions generate a stack trace:
(info (Exception. "Oh noes") "arg1" "arg2")
=> 2012-May-28 17:35:16:132 +0700 INFO [timbre.tests] - arg1 arg2
java.lang.Exception: Oh noes
NO_SOURCE_FILE:1 timbre.tests/eval6409
Compiler.java:6511 clojure.lang.Compiler.eval
[...]
Configuration
Easily adjust the current logging level:
(timbre/set-level! :warn)
Enable the standard Postal-based email appender:
(timbre/set-config! [:shared-appender-config :postal]
^{:host "mail.isp.net" :user "jsmith" :pass "sekrat!!1"}
{:from "me@draines.com" :to "foo@example.com"})
(timbre/set-config! [:appenders :postal :enabled?] true)
Rate-limit to one email per message per minute:
(timbre/set-config! [:appenders :postal :max-message-per-msecs] 60000)
And make sure emails are sent asynchronously:
(timbre/set-config! [:appenders :postal :async?] true)
Custom Appenders
Writing a custom appender is easy:
(timbre/set-config!
[:appenders :my-appender]
{:doc "Hello-world appender"
:min-level :debug
:enabled? true
:async? false
:max-message-per-msecs nil ; No rate limiting
:fn (fn [{:keys [message] :as appender-args}]
(println "Hello world!" message))})
See (doc timbre/config)
for more information on appenders.
Contact & Contribution
Reach me (Peter Taoussanis) at p.taoussanis at gmail.com for questions/comments/suggestions/whatever. I'm very open to ideas if you have any!
I'm also on Twitter: @ptaoussanis.
License
Distributed under the Eclipse Public License, the same as Clojure.