# Filter decode from Base64

**URL:** <https://discuss.elastic.co/t/filter-decode-from-base64/89282>\
**Category:** Logstash\
**Created:** [June 13, 2017, 11:16pm UTC](https://discuss.elastic.co/t/filter-decode-from-base64/89282 "2017-06-13T23:16:13Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Xavier\_Clavien](https://avatars.discourse-cdn.com/v4/letter/x/57b2e6/32.png) [@Xavier\_Clavien](https://discuss.elastic.co/u/Xavier_Clavien)\
**Post date:** [June 13, 2017, 11:16pm UTC](https://discuss.elastic.co/t/filter-decode-from-base64/89282/1 "2017-06-13T23:16:14Z")

</div>

Hi

I'm running Docker image sebp/elk with :

> -logstash: 5.4.0  
> -elasticsearch: Version: 5.4.0, Build: 780f8c4/2017-04-28T17:43:27.229Z, JVM: 1.8.0\_121  
> -kibana: 5.4.0  
> -ruby: jruby 1.7.25 (1.9.3p551) 2016-04-13 867cb81 on OpenJDK 64-Bit Server VM 1.8.0\_121-8u121-b13-0ubuntu1.16.04.2-b13 +jit [linux-amd64]

In the filter {} part I run this ruby code that is not working  
Apparently the syntax has change between version 4 and version 5 but I don't know what did change for Base64

> filter {  
> if [rx][moteeui] == "70B3D580A010106A" {  
> mutate { add\_field =\> { "tln\_decoded" =\> "" } }  
> mutate { add\_field =\> { "tln\_battery\_level" =\> "0.0" } }  
> mutate { add\_field =\> { "tln\_temperature" =\> "0.0" } }  
> mutate { convert =\> { "tln\_battery\_level" =\> "float" } }  
> mutate { convert =\> { "tln\_temperature" =\> "float" } }

> ```
> ruby {
> init => "require 'base64'"
> code => "
> event.set( '[tln_decoded]', Base64.decode64( event.get('[rx][userdata][payload]') ) )
> event.set( '[tln_battery_level]', ( event.get('[tln_decoded]' )[2..3].to_i(16) / 254.0 ) * 100.0 )
> event.set( '[tln_temperature]', event.get('[tln_decoded]' )[12..15].to_i(16) / 16.0 )
> "
> }
> }
> 
> ```
> 
> }  
> filter {  
> if [rx][moteeui] == "70B3D580A010106A" {  
> mutate { add\_field =\> { "tln\_decoded" =\> "" } }  
> mutate { add\_field =\> { "tln\_battery\_level" =\> "0.0" } }  
> mutate { add\_field =\> { "tln\_temperature" =\> "0.0" } }  
> mutate { convert =\> { "tln\_battery\_level" =\> "float" } }  
> mutate { convert =\> { "tln\_temperature" =\> "float" } }

> ```
> ruby {
> init => "require 'base64'"
> code => "
> event.set( '[tln_decoded]', Base64.decode64( event.get('[rx][userdata][payload]') ) )
> event.set( '[tln_battery_level]', ( event.get('[tln_decoded]' )[2..3].to_i(16) / 254.0 ) * 100.0 )
> event.set( '[tln_temperature]', event.get('[tln_decoded]' )[12..15].to_i(16) / 16.0 )
> "
> }
> }
> 
> ```
> 
> }

Hope somebody can help  
akaii

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<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [June 14, 2017, 5:41am UTC](https://discuss.elastic.co/t/filter-decode-from-base64/89282/2 "2017-06-14T05:41:05Z")

</div>

It looks like you're missing a closing parenthesis for the second and third event.set calls.

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<div class="post-metadata">

**Author:** ![Xavier\_Clavien](https://avatars.discourse-cdn.com/v4/letter/x/57b2e6/32.png) [@Xavier\_Clavien](https://discuss.elastic.co/u/Xavier_Clavien)\
**Post date:** [June 15, 2017, 12:10am UTC](https://discuss.elastic.co/t/filter-decode-from-base64/89282/3 "2017-06-15T00:10:49Z")

</div>

hey

still not working I did change the code like this :

> filter {  
> if [rx][moteeui] {  
> mutate { add\_field =\> { "tln\_decoded" =\> "" } }  
> mutate { add\_field =\> { "tln\_battery\_level" =\> "0.0" } }  
> mutate { add\_field =\> { "tln\_temperature" =\> "0.0" } }  
> mutate { convert =\> { "tln\_battery\_level" =\> "float" } }  
> mutate { convert =\> { "tln\_temperature" =\> "float" } }  
> mutate { add\_field =\> { "tln\_flow\_level\_intensite" =\> "0.0" } }  
> mutate { convert =\> { "tln\_flow\_level\_intensite" =\> "float" } }  
> mutate { add\_field =\> { "tln\_vibration\_level" =\> "0.0" } }  
> mutate { convert =\> { "tln\_vibration\_level" =\> "float" } }  
> ruby {  
> init =\> "require 'base64'"  
> code =\> "  
> event.set( '[tln\_decoded]', Base64.decode64( event.get('[rx][userdata][payload]') ) )  
> event.set( '[tln\_battery\_level]', ( event.get('[tln\_decoded]' )[2..3].to\_i(16) / 254.0 ) \* 100.0 )
> 
> ```
> if event.get('[rx][userdata][payload]') == '70B3D580A010106A'
> event.set( '[tln_flow_level_intensite]', event.get('[tln_decoded]')[12..15].to_i(16) / 254.0 )
> event.set( '[tln_vibration_level]', ( ( ( event.get('[tln_flow_level_intensite]') - 4 ) * 25.4 ) / 16.0 ) )
> elseif event.get('[rx][userdata][payload]') == '70B3D580A0101071'
> event.set( '[tln_temperature]', event.get('[tln_decoded]' )[12..15].to_i(16) / 16.0 )
> end
> "
> }
> }
> 
> ```
> 
> }

I got no errors in /var/logstash/logstash-plain.log when an index is coming in filter.

Regards,  
akaii

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<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [June 15, 2017, 5:28am UTC](https://discuss.elastic.co/t/filter-decode-from-base64/89282/4 "2017-06-15T05:28:39Z")

</div>

Please show an example message where the ruby filter did nothing. Use a `stdout { codec => rubydebug }` output to dump the raw events.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 13, 2017, 5:28am UTC](https://discuss.elastic.co/t/filter-decode-from-base64/89282/5 "2017-07-13T05:28:41Z")

</div>

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