io.gravitee.node.monitoring.healthcheck.NodeHealthCheckManagementEndpoint Maven / Gradle / Ivy

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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * 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.gravitee.node.monitoring.healthcheck;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.gravitee.common.http.HttpMethod;
import io.gravitee.common.http.HttpStatusCode;
import io.gravitee.common.http.MediaType;
import io.gravitee.node.api.healthcheck.ProbeEvaluator;
import io.gravitee.node.api.healthcheck.Result;
import io.gravitee.node.management.http.endpoint.ManagementEndpoint;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.vertx.core.http.HttpServerResponse;
import io.vertx.ext.web.RoutingContext;
import java.util.Arrays;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;

/**
 * @author David BRASSELY (david.brassely at graviteesource.com)
 * @author GraviteeSource Team
 */
@Slf4j
@RequiredArgsConstructor
public class NodeHealthCheckManagementEndpoint implements ManagementEndpoint {

    public static final String PROBE_FILTER = "probes";

    private final ProbeEvaluator probeEvaluator;
    private final ObjectMapper mapper;

    @Override
    public HttpMethod method() {
        return HttpMethod.GET;
    }

    @Override
    public String path() {
        return "/health";
    }

    @Override
    public void handle(RoutingContext ctx) {
        Set probeIds;
        if (ctx.queryParams().contains(PROBE_FILTER)) {
            probeIds =
                ctx.queryParams().getAll(PROBE_FILTER).stream().flatMap(s -> Arrays.stream(s.split(","))).collect(Collectors.toSet());
        } else {
            probeIds = null;
        }
        probeEvaluator
            .evaluate(probeIds)
            .thenAccept(probeResults -> {
                final Map results = probeResults
                    .entrySet()
                    .stream()
                    .filter(entry -> probeIds != null ? probeIds.contains(entry.getKey().id()) : entry.getKey().isVisibleByDefault())
                    .collect(Collectors.toMap(entry -> entry.getKey().id(), Map.Entry::getValue));

                if (probeIds != null) {
                    probeIds
                        .stream()
                        .filter(probeId -> !results.containsKey(probeId))
                        .forEach(probeId -> results.put(probeId, Result.unhealthy("probe not found")));
                }

                HttpServerResponse response = ctx.response();
                boolean healthyProbe = results.values().stream().allMatch(Result::isHealthy);
                response.setStatusCode(healthyProbe ? HttpStatusCode.OK_200 : HttpStatusCode.INTERNAL_SERVER_ERROR_500);
                response.putHeader(HttpHeaderNames.CONTENT_TYPE, MediaType.APPLICATION_JSON);
                response.setChunked(true);

                try {
                    response.write(mapper.writeValueAsString(results));
                } catch (JsonProcessingException e) {
                    log.warn("Unable to encode health check result into json.", e);
                }

                // End the response
                response.end();
            });
    }
}