Filter JSON content in field and parse target with existing mapping

(Stefano Messina) #1

I'm trying to filter a second type of messages coming in my input queue.
The difference between messages is that in the second type of messages the log is embedded in a JSON as value of the "Message" field. I configured the JSON filter plugin as follow:

filter {
  json {
    source => "Message"
    target => "doc"
    remove_field => ["Message"]

As expected the JSON parsed value of "Message" is placed in the new field "doc". Now, I'm struggling to further parse the "doc" nested fields. I'm using the add_field parameter to do this, without success tho.


Can you show us what the doc field looks like and explain exactly what you want to parse from it?

(Stefano Messina) #3

Here's an example:

      "filename" => "fixtures/",
    "@timestamp" => 2018-05-17T15:34:00.215Z,
         "cg_id" => "c6b46234-74d1-45dd-ab3e-1402b2f7147b",
      "@version" => "1",
          "name" => "mex-test",
       "message" => "This is a manually inserted message",
           "env" => "testing",
     "levelname" => "INFO",
        "region" => "local",
      "customer" => "TestCustomerCG",
          "tags" => [
        [0] "_dateparsefailure"
          "Type" => "Notification",
    "@timestamp" => 2018-05-17T15:34:00.268Z,
      "@version" => "1",
          "json" => "{\"_id\": null, \"levelname\": \"INFO\", \"asctime\": \"2018/05/11 16:02:14.209597\", \"customer\": \"TestCustomerCG\", \"message\": \"This is a manually inserted message as wrapped by SNS\", \"name\": \"test-logger\", \"funcName\": \"<module>\", \"filename\": \"fixtures/\", \"env\": \"testing\", \"region\": \"local\"}"

So basically I need the nested field in "json" to be unwrapped and shown as the fields of the first message.

(Sara) #4

Have you tried using "codec" => "json" in your output plugin?

(Stefano Messina) #5

Yes, nothing changes


So you have json in a field called json. Use a json filter to parse it.

json { source => "json" target => "someField" }

(system) #7

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