The Parser Filter plugin allows for parsing fields in event records.
Configuration Parameters
The plugin supports the following configuration parameters:
Key
Description
Default
Key_Name
Specify field name in record to parse.
Parser
Specify the parser name to interpret the field. Multiple Parser entries are allowed (one per line).
Preserve_Key
Keep original Key_Name field in the parsed result. If false, the field will be removed.
False
Reserve_Data
Keep all other original fields in the parsed result. If false, all other original fields will be removed.
False
Unescape_Key
If the key is an escaped string (e.g: stringify JSON), unescape the string before applying the parser.
False
Getting Started
Configuration File
This is an example of parsing a record {"data":"100 0.5 true This is example"}.
The plugin needs a parser file which defines how to parse each field.
[PARSER] Name dummy_test Format regex Regex ^(?<INT>[^ ]+) (?<FLOAT>[^ ]+) (?<BOOL>[^ ]+) (?<STRING>.+)$
The path of the parser file should be written in configuration file under the [SERVICE] section.
[SERVICE] Parsers_File /path/to/parsers.conf[INPUT] Name dummy Tag dummy.data Dummy {"data":"100 0.5 true This is example"}[FILTER] Name parser Match dummy.* Key_Name data Parser dummy_test[OUTPUT] Name stdout Match *
The output is
$ fluent-bit -c dummy.conf
Fluent Bit v1.x.x
* Copyright (C) 2019-2020 The Fluent Bit Authors
* Copyright (C) 2015-2018 Treasure Data
* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
* https://fluentbit.io
[2017/07/06 22:33:12] [ info] [engine] started
[0] dummy.data: [1499347993.001371317, {"INT"=>"100", "FLOAT"=>"0.5", "BOOL"=>"true", "STRING"=>"This is example"}]
[1] dummy.data: [1499347994.001303118, {"INT"=>"100", "FLOAT"=>"0.5", "BOOL"=>"true", "STRING"=>"This is example"}]
[2] dummy.data: [1499347995.001296133, {"INT"=>"100", "FLOAT"=>"0.5", "BOOL"=>"true", "STRING"=>"This is example"}]
[3] dummy.data: [1499347996.001320284, {"INT"=>"100", "FLOAT"=>"0.5", "BOOL"=>"true", "STRING"=>"This is example"}]
You can see the records {"data":"100 0.5 true This is example"} are parsed.
Preserve original fields
By default, the parser plugin only keeps the parsed fields in its output.
If you enable Reserve_Data, all other fields are preserved:
[PARSER] Name dummy_test Format regex Regex ^(?<INT>[^ ]+) (?<FLOAT>[^ ]+) (?<BOOL>[^ ]+) (?<STRING>.+)$
[SERVICE] Parsers_File /path/to/parsers.conf[INPUT] Name dummy Tag dummy.data Dummy {"data":"100 0.5 true This is example","key1":"value1","key2":"value2"}[FILTER] Name parser Match dummy.* Key_Name data Parser dummy_test Reserve_Data On
This will produce the output:
$ fluent-bit -c dummy.conf
Fluent-Bit v0.12.0
Copyright (C) Treasure Data
[2017/07/06 22:33:12] [ info] [engine] started
[0] dummy.data: [1499347993.001371317, {"INT"=>"100", "FLOAT"=>"0.5", "BOOL"=>"true", "STRING"=>"This is example"}, "key1":"value1", "key2":"value2"]
[1] dummy.data: [1499347994.001303118, {"INT"=>"100", "FLOAT"=>"0.5", "BOOL"=>"true", "STRING"=>"This is example"}, "key1":"value1", "key2":"value2"]
[2] dummy.data: [1499347995.001296133, {"INT"=>"100", "FLOAT"=>"0.5", "BOOL"=>"true", "STRING"=>"This is example"}, "key1":"value1", "key2":"value2"]
[3] dummy.data: [1499347996.001320284, {"INT"=>"100", "FLOAT"=>"0.5", "BOOL"=>"true", "STRING"=>"This is example"}, "key1":"value1", "key2":"value2"]
If you enable Reserved_Data and Preserve_Key, the original key field will be preserved as well:
[PARSER] Name dummy_test Format regex Regex ^(?<INT>[^ ]+) (?<FLOAT>[^ ]+) (?<BOOL>[^ ]+) (?<STRING>.+)$
[SERVICE] Parsers_File /path/to/parsers.conf[INPUT] Name dummy Tag dummy.data Dummy {"data":"100 0.5 true This is example","key1":"value1","key2":"value2"}[FILTER] Name parser Match dummy.* Key_Name data Parser dummy_test Reserve_Data On Preserve_Key On
This will produce the following output:
$ fluent-bit -c dummy.conf
Fluent-Bit v0.12.0
Copyright (C) Treasure Data
[2017/07/06 22:33:12] [ info] [engine] started
[0] dummy.data: [1499347993.001371317, {"data":"100 0.5 true This is example", "INT"=>"100", "FLOAT"=>"0.5", "BOOL"=>"true", "STRING"=>"This is example"}]
[1] dummy.data: [1499347994.001303118, {"data":"100 0.5 true This is example", "INT"=>"100", "FLOAT"=>"0.5", "BOOL"=>"true", "STRING"=>"This is example"}]
[2] dummy.data: [1499347995.001296133, {"data":"100 0.5 true This is example", "INT"=>"100", "FLOAT"=>"0.5", "BOOL"=>"true", "STRING"=>"This is example"}]
[3] dummy.data: [1499347996.001320284, {"data":"100 0.5 true This is example", "INT"=>"100", "FLOAT"=>"0.5", "BOOL"=>"true", "STRING"=>"This is example"}]
