Scenario 2: Assigning Values to Empty Log Fields Using the e_set Function

You can use the e_set function to assign values to empty fields in logs.

1. Sub-scenario 1: assigns a value to a field when the field does not exist or its current value is empty.

   e_set("result", "......value......", mode="fill")

   Example:

   • Raw log

     {
         "name":""
     }

   • Processing rule

     e_set("name", "Apache 2.0", mode="fill")

   • Processing result

     {
     name:Apache 2.0
     }

2. Sub-scenario 2: assigns values to multiple fields.

   e_set("k1", "v1", "k2", "v2")

   Example:

   • Raw log

     {"source":"192.168.0.1",
     "topic":"",
     "tag":"",
     "id":7990,
     "content":"this is a log"
     }

   • Processing rule

     e_set("topic","app","tag","stu")

   • Processing result

     {topic: app
     source: 192.168.0.1
     tag: stu
     id: 7990
     content: this is a log
     }