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log-appenders.md

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description
This page explains what log appenders are and their parameters

Log appenders

What log appenders are

There are appenders in Aidbox to process log messages. An appender is a processing pipeline which:

  1. Filters log messages according to appender's rules
  2. Transforms logs according to appender's rules
  3. Delivers logs to the log destination

Each appender has independent set of filters and transformers. You can think of appenders as of streams that preprocess logs and deliver log messages.

How appender can be attached

To attach an appender:

  1. Define the appender in Aidbox configuration
  2. Connect the appender as Aidbox service
{:ns     main
 :import #{aidbox
           aidbox.log
           config}

 db-q-transform
 {:zen/tags #{aidbox.log/transform}
  :transforms
   [{:filter {:path [:d] :op :min :value 100}}
    {:trim {:path [:sql] :length 50}}]}

 stdout-appender
 {:zen/tags #{aidbox/service}
  :engine   aidbox.log/stdout-appender
  :transforms {:qb/q db-q-transform}}

 box
 {:zen/tags #{aidbox/system}
  :config   config/zen-config
  :services {:seed            config/admin-seed
             :stdout-appender stdout-appender}}}

In this example stdout-appender is defined and connected to Aidbox as a service.

stdout-appender

The stdout-appender directs the logs stream to the standard output (stdout).

 stdout-appender
 {:zen/tags   #{aidbox/service}
  :engine     aidbox.log/stdout-appender
  :pretty     true}

Parameters

  • :pretty enables prettiness if it is true

elasticsearch-appender

It directs the stream of log messages to the Elasticsearch instance.

{:ns     main
 :import #{aidbox
           aidbox.log
           config}

 elasticsearch-appender
 {:zen/tags   #{aidbox/service}
  :engine     aidbox.log/elasticsearch-appender
  :config     {:url           "http://localhost:9200"
               :index-pattern "'aidbox'-yyyy-MM-dd"
               :batch         {:size 200
                               :timeout 5000}}}

 box
 {:zen/tags #{aidbox/system}
  :config   config/zen-config
  :services {:seed                   config/admin-seed
             :elasticsearch-appender elasticsearch-appender}}}

Parameters

  • config
    • url Elasticsearch url
    • index-pattern Сustom index name format string. Default value is ‘aidbox-logs’-yyyy-MM-dd
    • auth Basic auth credentials if necessary
      • username
      • password
    • batch
      • size Size of elastic search post batch. Default value is 200
      • timeout Timeout (in milliseconds) when to post batch if there not enough messages to post a full batch. Default value is 1000 (1 second)