Enable adding multiple static fields via environment variable and/or logback.properties about logback-gelf HOT 2 CLOSED

package mypackage;

import java.util.function.BiConsumer;

import ch.qos.logback.classic.spi.ILoggingEvent;
import de.siegmar.logbackgelf.GelfFieldMapper;

public class CustomFieldMapper implements GelfFieldMapper<String> {

    @Override
    public void mapField(ILoggingEvent event, BiConsumer<String, String> valueHandler) {
        valueHandler.accept("MY_KEY", "MY_VALUE");
        valueHandler.accept("MY_KEY2", "MY_VALUE2");
    }

}

package mypackage;

import ch.qos.logback.classic.spi.ILoggingEvent;
import de.siegmar.logbackgelf.GelfFieldMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.function.BiConsumer;

public class GelfEnvVarsFieldMapper implements GelfFieldMapper<String> {

    private final Logger logger = LoggerFactory.getLogger(GelfEnvVarsFieldMapper.class);

    @Override
    public void mapField(ILoggingEvent iLoggingEvent, BiConsumer<String, String> biConsumer) {
        System.getenv().forEach((key,value) -> {
            if(key.toUpperCase().startsWith("GELF_")) {
                biConsumer.accept(key, value);
            }
        });
    }

}