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Exposes metrics over Spring WebFlux reactive endpoints
There is a newer version: 6.0.1
/*
 * 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 com.opentable.metrics.reactive;

import static com.codahale.metrics.health.HealthCheck.Result;

import java.util.Map;

import javax.inject.Inject;

import org.apache.commons.lang3.tuple.Pair;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import reactor.core.publisher.Mono;

import com.opentable.metrics.common.SortedEntry;
import com.opentable.metrics.health.HealthConfiguration;
import com.opentable.metrics.http.CheckState;
import com.opentable.metrics.http.HealthController;

/**
 * Health endpoint for Reactive HTTP servers.
 */
@RestController
public class HealthEndpoint {

    public static final String ALL = "all";
    public static final String FALSE = "false";
    private final HealthController controller;

    @Inject
    public HealthEndpoint(HealthController controller) {
        this.controller = controller;
    }

    @RequestMapping(value = HealthConfiguration.NEW_HEALTH_CHECK_PATH, method = RequestMethod.GET)
    public Mono, Result>>> getInfraHealth(@RequestParam(name= ALL, defaultValue= FALSE) boolean all) {
        return getHealth(all);
    }

    @RequestMapping(value = HealthConfiguration.NEW_HEALTH_CHECK_PATH + "/group/{group}", method = RequestMethod.GET)
    public Mono> getInfraHealthGroup(@PathVariable("group") String group, @RequestParam(name= ALL, defaultValue= FALSE) boolean all) {
       return getHealthGroup(group, all);
    }

    @RequestMapping(value = HealthConfiguration.HEALTH_CHECK_PATH,  method = RequestMethod.GET)
    public Mono, Result>>> getHealth(@RequestParam(name= ALL, defaultValue= FALSE) boolean all) {
        final Pair, CheckState> result = controller.runChecks();
        return Mono.just(ResponseEntity.status(result.getRight().getHttpStatus()).body(SortedEntry.health(all, result.getLeft())));
    }

    @RequestMapping(value = HealthConfiguration.HEALTH_CHECK_PATH + "/group/{group}", method = RequestMethod.GET)
    public Mono> getHealthGroup(@PathVariable("group") String group, @RequestParam(name= ALL, defaultValue= FALSE) boolean all) {
        final Pair, CheckState> result = controller.runChecks(group);
        if (result == null) {
            return Mono.just(ResponseEntity.notFound().build());
        }
        return Mono.just(ResponseEntity.status(result.getRight().getHttpStatus()).body(SortedEntry.health(all, result.getLeft())));
    }

}