io.micronaut.discovery.consul.client.v1.AbstractConsulClient Maven / Gradle / Ivy

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Adds Service Discovery Features for Eureka and Consul
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/*
 * Copyright 2017-2020 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
 *
 * https://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.discovery.consul.client.v1;

import io.micronaut.context.annotation.BootstrapContextCompatible;
import io.micronaut.context.annotation.Requires;
import io.micronaut.core.annotation.TypeHint;
import io.micronaut.core.async.publisher.Publishers;
import io.micronaut.core.naming.NameUtils;
import io.micronaut.discovery.ServiceInstance;
import io.micronaut.discovery.consul.ConsulConfiguration;
import io.micronaut.discovery.consul.ConsulServiceInstance;
import io.micronaut.http.client.annotation.Client;
import org.reactivestreams.Publisher;

import jakarta.inject.Inject;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Optional;

/**
 * Abstract implementation of {@link ConsulClient} that also implements {@link io.micronaut.discovery.DiscoveryClient}.
 *
 * @author Graeme Rocher
 * @since 1.0
 */
@SuppressWarnings("unused")
@Client(id = ConsulClient.SERVICE_ID, path = "/v1", configuration = ConsulConfiguration.class)
@Requires(beans = ConsulConfiguration.class)
@TypeHint({TTLCheck.class, HTTPCheck.class})
@BootstrapContextCompatible
public abstract class AbstractConsulClient implements ConsulClient {

    static final String CONSUL_REGISTRATION_RETRY_COUNT = "${" + ConsulConfiguration.ConsulRegistrationConfiguration.PREFIX + ".retry-count:3}";
    static final String CONSUL_REGISTRATION_RETRY_DELAY = "${" + ConsulConfiguration.ConsulRegistrationConfiguration.PREFIX + ".retry-delay:3s}";
    static final String EXPR_CONSUL_CONFIG_RETRY_COUNT = "${" + ConsulConfiguration.ConsulConfigDiscoveryConfiguration.PREFIX + ".retry-count:3}";
    static final String EXPR_CONSUL_CONFIG_RETRY_DELAY = "${" + ConsulConfiguration.ConsulConfigDiscoveryConfiguration.PREFIX + ".retry-delay:1s}";

    private ConsulConfiguration consulConfiguration = new ConsulConfiguration();

    /**
     * @param consulConfiguration The Consul configuration
     */
    @Inject
    public void setConsulConfiguration(ConsulConfiguration consulConfiguration) {
        if (consulConfiguration != null) {
            this.consulConfiguration = consulConfiguration;
        }
    }

    @Override
    public String getDescription() {
        return ConsulClient.SERVICE_ID;
    }

    @Override
    public Publisher> getServiceIds() {
        if (!consulConfiguration.getDiscovery().isEnabled()) {
            return Publishers.just(Collections.emptyList());
        } else {
            return ConsulClient.super.getServiceIds();
        }
    }

    @Override
    public Publisher> getInstances(String serviceId) {
        if (!consulConfiguration.getDiscovery().isEnabled()) {
            return Publishers.just(Collections.emptyList());
        }
        serviceId = NameUtils.hyphenate(serviceId);
        if (SERVICE_ID.equals(serviceId)) {
            return Publishers.just(
                Collections.singletonList(ServiceInstance.of(SERVICE_ID, consulConfiguration.getHost(), consulConfiguration.getPort()))
            );
        } else {
            ConsulConfiguration.ConsulDiscoveryConfiguration discovery = consulConfiguration.getDiscovery();
            boolean passing = discovery.isPassing();
            String datacenter = discovery.getDatacenters().get(serviceId);
            String tag = discovery.getTags().get(serviceId);
            Optional scheme = Optional.ofNullable(discovery.getSchemes().get(serviceId));

            Publisher> healthyServicesPublisher = getHealthyServices(serviceId, passing, tag, datacenter);
            return Publishers.map(healthyServicesPublisher, healthEntries -> {
                List serviceInstances = new ArrayList<>();
                for (HealthEntry healthEntry : healthEntries) {
                    serviceInstances.add(new ConsulServiceInstance(healthEntry, scheme.orElse("http")));
                }
                return serviceInstances;
            });
        }
    }
}