DataDogReporter.java

/*
 * Copyright 2014-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.pivotal.strepsirrhini.chaoslemur.reporter;

import io.pivotal.strepsirrhini.chaoslemur.Member;
import org.atteo.evo.inflector.English;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.client.HttpClientErrorException;
import org.springframework.web.client.RestTemplate;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.stream.Collectors;

final class DataDogReporter implements Reporter {

    private static final String URI = "https://app.datadoghq.com/api/v1/events?api_key={apiKey}&application_key={appKey}";

    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    private final String apiKey;

    private final String appKey;

    private final RestTemplate restTemplate;

    private final String[] tags;

    DataDogReporter(String apiKey, String appKey, RestTemplate restTemplate, String[] tags) {
        this.apiKey = apiKey;
        this.appKey = appKey;
        this.restTemplate = restTemplate;
        this.tags = tags;
    }

    @Override
    public void sendEvent(Event event) {
        Map<String, Object> payload = new HashMap<>();
        payload.put("title", title(event.getIdentifier()));
        payload.put("text", message(event.getMembers()));
        payload.put("tags", this.tags);

        try {
            this.restTemplate.postForEntity(URI, payload, Void.class, this.apiKey, this.appKey);
        } catch (HttpClientErrorException e) {
            this.logger.warn(e.getResponseBodyAsString());
        }
    }

    private String message(List<Member> members) {
        int size = members.size();

        String s = "\n";
        s += size + English.plural(" VM", size) + " destroyed:\n";
        s += members.stream()
            .sorted()
            .map(member -> String.format("  • %s", member.getName()))
            .collect(Collectors.joining("\n"));

        return s;
    }

    private String title(UUID identifier) {
        return String.format("Chaos Lemur Destruction (%s)", identifier);
    }

}