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Modify

The Modify Filter plugin allows you to change records using rules and conditions.

Example usage

As an example using JSON notation to,

  • Rename Key2 to RenamedKey

  • Add a key OtherKey with value Value3 if OtherKey does not yet exist

Example (input)

{
  "Key1"     : "Value1",
  "Key2"     : "Value2"
}

Example (output)

{
  "Key1"       : "Value1",
  "RenamedKey" : "Value2",
  "OtherKey"   : "Value3"
}

Configuration Parameters

Rules

The plugin supports the following rules:

OperationParameter 1Parameter 2Description

Set

STRING:KEY

STRING:VALUE

Add a key/value pair with key KEY and value VALUE. If KEY already exists, this field is overwritten

Add

STRING:KEY

STRING:VALUE

Add a key/value pair with key KEY and value VALUE if KEY does not exist

Remove

STRING:KEY

NONE

Remove a key/value pair with key KEY if it exists

Remove_wildcard

WILDCARD:KEY

NONE

Remove all key/value pairs with key matching wildcard KEY

Remove_regex

REGEXP:KEY

NONE

Remove all key/value pairs with key matching regexp KEY

Rename

STRING:KEY

STRING:RENAMED_KEY

Rename a key/value pair with key KEY to RENAMED_KEY if KEY exists AND RENAMED_KEY does not exist

Hard_rename

STRING:KEY

STRING:RENAMED_KEY

Rename a key/value pair with key KEY to RENAMED_KEY if KEY exists. If RENAMED_KEY already exists, this field is overwritten

Copy

STRING:KEY

STRING:COPIED_KEY

Copy a key/value pair with key KEY to COPIED_KEY if KEY exists AND COPIED_KEY does not exist

Hard_copy

STRING:KEY

STRING:COPIED_KEY

Copy a key/value pair with key KEY to COPIED_KEY if KEY exists. If COPIED_KEY already exists, this field is overwritten

  • Rules are case insensitive, parameters are not

  • Any number of rules can be set in a filter instance.

  • Rules are applied in the order they appear, with each rule operating on the result of the previous rule.

Conditions

The plugin supports the following conditions:

ConditionParameterParameter 2Description

Key_exists

STRING:KEY

NONE

Is true if KEY exists

Key_does_not_exist

STRING:KEY

NONE

Is true if KEY does not exist

A_key_matches

REGEXP:KEY

NONE

Is true if a key matches regex KEY

No_key_matches

REGEXP:KEY

NONE

Is true if no key matches regex KEY

Key_value_equals

STRING:KEY

STRING:VALUE

Is true if KEY exists and its value is VALUE

Key_value_does_not_equal

STRING:KEY

STRING:VALUE

Is true if KEY exists and its value is not VALUE

Key_value_matches

STRING:KEY

REGEXP:VALUE

Is true if key KEY exists and its value matches VALUE

Key_value_does_not_match

STRING:KEY

REGEXP:VALUE

Is true if key KEY exists and its value does not match VALUE

Matching_keys_have_matching_values

REGEXP:KEY

REGEXP:VALUE

Is true if all keys matching KEY have values that match VALUE

Matching_keys_do_not_have_matching_values

REGEXP:KEY

REGEXP:VALUE

Is true if all keys matching KEY have values that do not match VALUE

  • Conditions are case insensitive, parameters are not

  • Any number of conditions can be set.

  • Conditions apply to the whole filter instance and all its rules. Not to individual rules.

  • All conditions have to be true for the rules to be applied.

  • You can set Record Accessor as STRING:KEY for nested key.

Example #1 - Add and Rename

In order to start filtering records, you can run the filter from the command line or through the configuration file. The following invokes the Memory Usage Input Plugin, which outputs the following (example),

[0] memory: [1488543156, {"Mem.total"=>1016044, "Mem.used"=>841388, "Mem.free"=>174656, "Swap.total"=>2064380, "Swap.used"=>139888, "Swap.free"=>1924492}]
[1] memory: [1488543157, {"Mem.total"=>1016044, "Mem.used"=>841420, "Mem.free"=>174624, "Swap.total"=>2064380, "Swap.used"=>139888, "Swap.free"=>1924492}]
[2] memory: [1488543158, {"Mem.total"=>1016044, "Mem.used"=>841420, "Mem.free"=>174624, "Swap.total"=>2064380, "Swap.used"=>139888, "Swap.free"=>1924492}]
[3] memory: [1488543159, {"Mem.total"=>1016044, "Mem.used"=>841420, "Mem.free"=>174624, "Swap.total"=>2064380, "Swap.used"=>139888, "Swap.free"=>1924492}]

Using command Line

Note: Using the command line mode requires quotes parse the wildcard properly. The use of a configuration file is recommended.

bin/fluent-bit -i mem \
  -p 'tag=mem.local' \
  -F modify \
  -p 'Add=Service1 SOMEVALUE' \
  -p 'Add=Service2 SOMEVALUE3' \
  -p 'Add=Mem.total2 TOTALMEM2' \
  -p 'Rename=Mem.free MEMFREE' \
  -p 'Rename=Mem.used MEMUSED' \
  -p 'Rename=Swap.total SWAPTOTAL' \
  -p 'Add=Mem.total TOTALMEM' \
  -m '*' \
  -o stdout

Configuration File

[INPUT]
    Name mem
    Tag  mem.local

[OUTPUT]
    Name  stdout
    Match *

[FILTER]
    Name modify
    Match *
    Add Service1 SOMEVALUE
    Add Service3 SOMEVALUE3
    Add Mem.total2 TOTALMEM2
    Rename Mem.free MEMFREE
    Rename Mem.used MEMUSED
    Rename Swap.total SWAPTOTAL
    Add Mem.total TOTALMEM

Result

The output of both the command line and configuration invocations should be identical and result in the following output.

[2018/04/06 01:35:13] [ info] [engine] started
[0] mem.local: [1522980610.006892802, {"Mem.total"=>4050908, "MEMUSED"=>738100, "MEMFREE"=>3312808, "SWAPTOTAL"=>1046524, "Swap.used"=>0, "Swap.free"=>1046524, "Service1"=>"SOMEVALUE", "Service3"=>"SOMEVALUE3", "Mem.total2"=>"TOTALMEM2"}]
[1] mem.local: [1522980611.000658288, {"Mem.total"=>4050908, "MEMUSED"=>738068, "MEMFREE"=>3312840, "SWAPTOTAL"=>1046524, "Swap.used"=>0, "Swap.free"=>1046524, "Service1"=>"SOMEVALUE", "Service3"=>"SOMEVALUE3", "Mem.total2"=>"TOTALMEM2"}]
[2] mem.local: [1522980612.000307652, {"Mem.total"=>4050908, "MEMUSED"=>738068, "MEMFREE"=>3312840, "SWAPTOTAL"=>1046524, "Swap.used"=>0, "Swap.free"=>1046524, "Service1"=>"SOMEVALUE", "Service3"=>"SOMEVALUE3", "Mem.total2"=>"TOTALMEM2"}]
[3] mem.local: [1522980613.000122671, {"Mem.total"=>4050908, "MEMUSED"=>738068, "MEMFREE"=>3312840, "SWAPTOTAL"=>1046524, "Swap.used"=>0, "Swap.free"=>1046524, "Service1"=>"SOMEVALUE", "Service3"=>"SOMEVALUE3", "Mem.total2"=>"TOTALMEM2"}]

Example #2 - Conditionally Add and Remove

Configuration File

[INPUT]
    Name mem
    Tag  mem.local
    Interval_Sec 1

[FILTER]
    Name    modify
    Match   mem.*

    Condition Key_Does_Not_Exist cpustats
    Condition Key_Exists Mem.used

    Set cpustats UNKNOWN

[FILTER]
    Name    modify
    Match   mem.*

    Condition Key_Value_Does_Not_Equal cpustats KNOWN

    Add sourcetype memstats

[FILTER]
    Name    modify
    Match   mem.*

    Condition Key_Value_Equals cpustats UNKNOWN

    Remove_wildcard Mem
    Remove_wildcard Swap
    Add cpustats_more STILL_UNKNOWN

[OUTPUT]
    Name           stdout
    Match          *

Result

[2018/06/14 07:37:34] [ info] [engine] started (pid=1493)
[0] mem.local: [1528925855.000223110, {"cpustats"=>"UNKNOWN", "sourcetype"=>"memstats", "cpustats_more"=>"STILL_UNKNOWN"}]
[1] mem.local: [1528925856.000064516, {"cpustats"=>"UNKNOWN", "sourcetype"=>"memstats", "cpustats_more"=>"STILL_UNKNOWN"}]
[2] mem.local: [1528925857.000165965, {"cpustats"=>"UNKNOWN", "sourcetype"=>"memstats", "cpustats_more"=>"STILL_UNKNOWN"}]
[3] mem.local: [1528925858.000152319, {"cpustats"=>"UNKNOWN", "sourcetype"=>"memstats", "cpustats_more"=>"STILL_UNKNOWN"}]

Example #3 - Emoji

Configuration File

[INPUT]
    Name mem
    Tag  mem.local

[OUTPUT]
    Name  stdout
    Match *

[FILTER]
    Name modify
    Match *

    Remove_Wildcard Mem
    Remove_Wildcard Swap
    Set This_plugin_is_on 🔥
    Set 🔥 is_hot
    Copy 🔥 💦
    Rename  💦 ❄️
    Set ❄️ is_cold
    Set 💦 is_wet

Result

[2018/06/14 07:46:11] [ info] [engine] started (pid=21875)
[0] mem.local: [1528926372.000197916, {"This_plugin_is_on"=>"🔥", "🔥"=>"is_hot", "❄️"=>"is_cold", "💦"=>"is_wet"}]
[1] mem.local: [1528926373.000107868, {"This_plugin_is_on"=>"🔥", "🔥"=>"is_hot", "❄️"=>"is_cold", "💦"=>"is_wet"}]
[2] mem.local: [1528926374.000181042, {"This_plugin_is_on"=>"🔥", "🔥"=>"is_hot", "❄️"=>"is_cold", "💦"=>"is_wet"}]
[3] mem.local: [1528926375.000090841, {"This_plugin_is_on"=>"🔥", "🔥"=>"is_hot", "❄️"=>"is_cold", "💦"=>"is_wet"}]
[0] mem.local: [1528926376.000610974, {"This_plugin_is_on"=>"🔥", "🔥"=>"is_hot", "❄️"=>"is_cold", "💦"=>"is_wet"}]

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