org.graylog2.radio.cluster.Ping.java Source code

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Here is the source code for org.graylog2.radio.cluster.Ping.java

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/**
 * This file is part of Graylog.
 *
 * Graylog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Graylog is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Graylog.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.graylog2.radio.cluster;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.Response;
import org.graylog2.plugin.ServerStatus;
import org.graylog2.plugin.system.NodeId;
import org.graylog2.rest.models.radio.requests.PingRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.inject.Inject;
import javax.inject.Named;
import java.io.IOException;
import java.net.URI;

import static com.google.common.base.Preconditions.checkNotNull;
import static javax.ws.rs.core.MediaType.APPLICATION_JSON;

public class Ping implements Runnable {
    /*
     * This is extremely simple. Once we do more than just the ping API calls
     * we should build something proper here.
     */

    private static final Logger LOG = LoggerFactory.getLogger(Ping.class);
    private static final MediaType CONTENT_TYPE = MediaType.parse(APPLICATION_JSON);

    private final ObjectMapper objectMapper;
    private final OkHttpClient httpClient;
    private final NodeId nodeId;
    private final URI serverUri;
    private final URI ourUri;

    @Inject
    public Ping(ObjectMapper objectMapper, @Named("systemHttpClient") OkHttpClient httpClient,
            @Named("rest_transport_uri") URI ourUri, @Named("graylog2_server_uri") URI serverUri, NodeId nodeId) {
        this.objectMapper = checkNotNull(objectMapper);
        this.httpClient = checkNotNull(httpClient);
        this.nodeId = checkNotNull(nodeId);
        this.ourUri = checkNotNull(ourUri);
        this.serverUri = checkNotNull(serverUri);
    }

    public void ping() throws IOException {
        final PingRequest pingRequest = PingRequest.create(ourUri.toString());

        final URI uri = serverUri.resolve("/system/radios/" + nodeId + "/ping");
        final Request request = new Request.Builder().url(uri.toURL())
                .put(RequestBody.create(CONTENT_TYPE, objectMapper.writeValueAsBytes(pingRequest))).build();

        final Response r = httpClient.newCall(request).execute();

        // fail on a non-ok status
        if (!r.isSuccessful()) {
            throw new RuntimeException("Expected successful HTTP response [2xx] but got [" + r.code()
                    + "]. Request was " + request.urlString());
        }
    }

    @Override
    public void run() {
        try {
            ping();
        } catch (IOException e) {
            LOG.error("Pinging the master node failed: ", e);
        }
    }
}