io.micronaut.configuration.jasync.health.JaysncHealthIndicator Maven / Gradle / Ivy

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/*
 * Copyright 2017-2018 original 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.micronaut.configuration.jasync.health;

import com.github.jasync.sql.db.Connection;
import io.micronaut.context.annotation.Requires;
import io.micronaut.core.util.StringUtils;
import io.micronaut.health.HealthStatus;
import io.micronaut.management.endpoint.health.HealthEndpoint;
import io.micronaut.management.health.indicator.HealthIndicator;
import io.micronaut.management.health.indicator.HealthResult;
import org.reactivestreams.Publisher;

import javax.inject.Singleton;
import java.util.Collections;

/**
 * A  {@link HealthIndicator} for reactive Postgres client.
 *
 * @author puneetbehl
 * @since 1.0
 */
@Requires(beans = HealthEndpoint.class)
@Requires(property = HealthEndpoint.PREFIX + ".jasync.enabled", notEquals = StringUtils.FALSE)
@Singleton
public class JaysncHealthIndicator implements HealthIndicator {

    public static final String NAME = "postgres-reactive";
    public static final String QUERY = "SELECT version();";
    private final Connection client;

    /**
     * Constructor.
     *
     * @param client A pool of connections.
     */
    public JaysncHealthIndicator(Connection client) {
        this.client = client;
    }

    @Override
    public Publisher getResult() {
        return s -> client.sendQuery(QUERY)
                .whenComplete((result, error) -> {
                    if (error != null) {
                        HealthResult health = HealthResult.builder(NAME, HealthStatus.DOWN).exception(error).build();
                        s.onNext(health);
                    } else {
                        HealthResult.Builder status = HealthResult.builder(NAME, HealthStatus.UP);
                        status.details(Collections.singletonMap("version", result.getRows().get(0).get(0)));
                        s.onNext(status.build());
                    }
                });
    }

}