Logstash Java hashSetting Syntax

Tom_Mahy · January 31, 2020, 8:14am

Hello,

We are currently in the process of writing a JAVA based logstash plugin
We can easily set custom properties in the logstash config and read them inside our class

But we cant get the maps to work

ie:
// public static final PluginConfigSpec<Map<String, Object>> CONFIG_CUSTOM_METADATA = PluginConfigSpec.hashSetting(PROPERTY_CUSTOM_METADATA, new HashMap<String, Object>(), false, false);

We have the following property in the pipeline.conf
customMetadata => {"https://biodiversity.europa.eu/":["BISE", "Biodiversity Information System Europe", "Biodiversity"]}

But its giving us an error that the json syntax is not correct.

What is the correct json syntax for maps ?

The full code is on github

github.com

wajja/logstash-filters/blob/master/logstash-filter-europaplugin/src/main/java/eu/wajja/filter/EuropaPlugin.java

package eu.wajja.filter;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Base64;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import java.util.stream.Collectors;

import org.apache.commons.collections4.map.HashedMap;

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Thank you

jsvd · February 3, 2020, 9:46am

Hi Tom,

For map settings you need to use the usual "hash" notation used elsewhere in the logstash pipeline, with => instead of colons:

customMetadata => { "https://biodiversity.europa.eu/" => ["BISE", "Biodiversity Information System Europe", "Biodiversity"]}

Tom_Mahy · February 4, 2020, 9:41am

That works great.

Thank you.

system · March 3, 2020, 9:41am

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