Logstash grok过滤器 - 动态命名字段

Question

我有以下格式的日志行,并想要提取字段:

[field1: content1] [field2: content2] [field3: content3] ...

我既不知道字段名称,也不知道字段数量.

我用反向引用和sprintf格式尝试了它,但没有得到任何结果:

match => [ "message", "(?:\[(\w+): %{DATA:\k<-1>}\])+" ] # not working
match => [ "message", "(?:\[%{WORD:fieldname}: %{DATA:%{fieldname}}\])+" ] # not working

这似乎只适用于一个领域,但不是更多:

match => [ "message", "(?:\[%{WORD:field}: %{DATA:content}\] ?)+" ]
add_field => { "%{field}" => "%{content}" }

kv过滤器也不合适,因为字段的内容可能包含空格.

是否有任何插件/策略来解决这个问题？

Answer 1

Logstash Ruby插件可以帮到你.:)

这是配置:

input {
    stdin {}
}

filter {
    ruby {
        code => "
            fieldArray = event['message'].split('] [')
            for field in fieldArray
                field = field.delete '['
                field = field.delete ']'
                result = field.split(': ')
                event[result[0]] = result[1]
            end
        "
    }
}

output {
    stdout {
        codec => rubydebug
    }
}

使用您的日志:

[field1: content1] [field2: content2] [field3: content3]

这是输出:

{
   "message" => "[field1: content1] [field2: content2] [field3: content3]",
  "@version" => "1",
"@timestamp" => "2014-07-07T08:49:28.543Z",
      "host" => "abc",
    "field1" => "content1",
    "field2" => "content2",
    "field3" => "content3"
}

我试过4个字段,它也有效.

请注意,eventruby代码中的logstash事件.您可以使用它来获取所有事件字段,例如message, @timestamp等.

好好享受!!!

Answer 2

我找到了另一种使用正则表达式的方法:

ruby {
    code => "
        fields = event['message'].scan(/(?<=\[)\w+: .*?(?=\](?: |$))/)
        for field in fields
            field = field.split(': ')
            event[field[0]] = field[1]
        end
    "
}