API Logging in Json format -


i log api request/response json format.

the expected logentry 

{   "timestamp" : "...",  "level" : "debug",  "headers" : [     "header1" : "value1",     "header2" : "value2",     "header3" : "value3"  ],  "requestpayload" : "<request json>"   // prefereablly sub-document, worst case string fine.     "labels" : [        //key fields can used searching logentry      "searchfield1" : "....",      "searchfield2" : "....",      "searchfield3" : "...."   ] }

my question :

using logback, how log nested fields (e.g. headers, labels, requestpaylod in above example), json sub-document. tried mdc, limited map of 'string, string' only, , considers fields after first level string.

i hate write custom logger this, , use goodness of proven logging frameworks(logback/log4j) control logging level, time stamping log event, etc.

you can use logback-contrib's jsonlayout inside logback appender. example:

<appender name="stdout" class="ch.qos.logback.core.consoleappender">     <layout class="ch.qos.logback.contrib.json.classic.jsonlayout">         <jsonformatter class="ch.qos.logback.contrib.jackson.jacksonjsonformatter">             <prettyprint>false</prettyprint>         </jsonformatter>         <timestampformat>yyyy-mm-dd' 'hh:mm:ss.sss</timestampformat>         <appendlineseparator>true</appendlineseparator>     </layout> </appender>

given log statements ...

mdc.put("header1", "headervalue1"); logger.info("hello!"); logger.info("good bye!");

... use of jsonlayout result in logback writing this:

{"timestamp":"2017-08-15 09:06:41.813","level":"info","thread":"main","mdc":{"header1":"headervalue1"},"logger":"com.stackoverflow.logback.logbacktest","message":"hello!","context":"default"} {"timestamp":"2017-08-15 09:06:41.887","level":"info","thread":"main","mdc":{"header1":"headervalue1"},"logger":"com.stackoverflow.logback.logbacktest","message":"good bye!","context":"default"}

i think ticks boxes of writing log events json documents whilst still retaining logback's behaviour such "control logging level, time stamping log event, etc". there built-in support changing json format (e.g. can include/exclude context, logger name etc) jsonlayout class provides extension point allow change attribute names in resulting json extending jsonlayout , overriding tojsonmap().

edit 1: addressing reply ("my question more on how achieve json subdocument/nesting mentioned. mdc limited map of only") ... could serialise complex mdc values json , add serialised json representations mdc. example:

    map<string, object> complexmdcvalue = new hashmap<>();     map<string, object> childmdcvalue = new hashmap<>();     childmdcvalue.put("name", "joe");     childmdcvalue.put("type", "martian");     complexmdcvalue.put("child", childmdcvalue);     complexmdcvalue.put("category", "etc");      mdc.put("complexnestedvalue", objectmapper.writevalueasstring(complexmdcvalue));     logger.info("hello!");

would produce output (in mvc logged key "complexnestedvalue" is json containing sub document):

{"timestamp":"2017-08-27 18:03:46.706","level":"info","thread":"main","mdc":{"complexnestedvalue":"{\"category\":\"etc\",\"child\":{\"name\":\"joe\",\"type\":\"martian\"}}"},"logger":"com.stackoverflow.logback.logbacktest","message":"hello!","context":"default"}

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