io.interact.dropwizard.logstash.appender.LogstashAppenderFactoryHelper Maven / Gradle / Ivy

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Dropwizard logging addon for sending logs using the logstash-logback-encoder.

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package io.interact.dropwizard.logstash.appender;

import java.io.IOException;
import java.io.StringWriter;
import java.util.Map;
import java.util.Optional;

import com.fasterxml.jackson.databind.ObjectMapper;

import net.logstash.logback.fieldnames.LogstashFieldNames;

public class LogstashAppenderFactoryHelper {

    public static LogstashFieldNames getFieldNamesFromHashMap(Map map) {
        LogstashFieldNames fieldNames = new LogstashFieldNames();

        fieldNames.setTimestamp(map.getOrDefault("timestamp", "@timestamp"));
        fieldNames.setVersion(map.getOrDefault("version", "@version"));
        fieldNames.setMessage(map.getOrDefault("message", "message"));
        fieldNames.setLogger(map.getOrDefault("logger", "logger_name"));
        fieldNames.setThread(map.getOrDefault("thread", "thread_name"));
        fieldNames.setLevel(map.getOrDefault("level", "level"));
        fieldNames.setLevelValue(map.getOrDefault("levelValue", "level_value"));
        fieldNames.setCaller(map.getOrDefault("caller", null));
        fieldNames.setCallerClass(map.getOrDefault("callerClass", "caller_class_name"));
        fieldNames.setCallerMethod(map.getOrDefault("callerMethod", "caller_method_name"));
        fieldNames.setCallerFile(map.getOrDefault("callerFile", "caller_file_name"));
        fieldNames.setCallerLine(map.getOrDefault("callerLine", "caller_line_number"));
        fieldNames.setStackTrace(map.getOrDefault("stackTrace", "stack_trace"));
        fieldNames.setTags(map.getOrDefault("tags", "tags"));
        fieldNames.setMdc(map.getOrDefault("mdc", null));
        fieldNames.setContext(map.getOrDefault("context", null));

        return fieldNames;
    }

    public static Optional getCustomFieldsFromHashMap(Map map) {
        StringWriter writer = new StringWriter();
        ObjectMapper mapper = new ObjectMapper();
        try {
            mapper.writeValue(writer, map);
        } catch (IOException e) {
            System.err.println("unable to parse customFields: " + e.getMessage());
            return Optional.empty();
        }
        return Optional.of(writer.toString());
    }

    private LogstashAppenderFactoryHelper() {
        // Hide default public constructor
    }
}