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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.eureka;

import io.micronaut.core.convert.value.ConvertibleValues;
import io.micronaut.core.util.StringUtils;
import io.micronaut.discovery.ServiceInstance;
import io.micronaut.discovery.eureka.client.v2.AmazonInfo;
import io.micronaut.discovery.eureka.client.v2.DataCenterInfo;
import io.micronaut.discovery.eureka.client.v2.InstanceInfo;
import io.micronaut.health.HealthStatus;
import jakarta.validation.constraints.NotNull;

import java.net.URI;
import java.util.Optional;

/**
 * A {@link ServiceInstance} implementation for Eureka.
 *
 * @author Graeme Rocher
 * @since 1.0
 */
public class EurekaServiceInstance implements ServiceInstance {
    private final InstanceInfo instanceInfo;
    private final URI uri;

    /**
     * @param instanceInfo The instance info
     */
    public EurekaServiceInstance(InstanceInfo instanceInfo) {
        this.instanceInfo = instanceInfo;
        this.uri = createURI(instanceInfo);
    }

    @Override
    public Optional getInstanceId() {
        return Optional.ofNullable(instanceInfo.getInstanceId());
    }

    @Override
    public HealthStatus getHealthStatus() {
        InstanceInfo.@NotNull Status status = instanceInfo.getStatus();
        return switch (status) {
            case UP -> HealthStatus.UP;
            case UNKNOWN -> HealthStatus.UNKNOWN;
            default -> HealthStatus.DOWN;
        };
    }

    @Override
    public Optional getZone() {
        @NotNull DataCenterInfo dataCenterInfo = instanceInfo.getDataCenterInfo();
        if (dataCenterInfo instanceof AmazonInfo amazonInfo) {
            String availabilityZone = amazonInfo.get(AmazonInfo.MetaDataKey.availabilityZone);
            return Optional.ofNullable(availabilityZone);
        }
        return ServiceInstance.super.getZone();
    }

    @Override
    public Optional getRegion() {
        @NotNull DataCenterInfo dataCenterInfo = instanceInfo.getDataCenterInfo();
        if (dataCenterInfo instanceof AmazonInfo amazonInfo) {
            String availabilityZone = amazonInfo.get(AmazonInfo.MetaDataKey.availabilityZone);
            return Optional.ofNullable(availabilityZone);
        }
        return ServiceInstance.super.getZone();
    }

    @Override
    public Optional getGroup() {
        String asgName = instanceInfo.getAsgName();
        if (StringUtils.isNotEmpty(asgName)) {
            return Optional.of(asgName);
        }
        return ServiceInstance.super.getZone();
    }

    /**
     * @return The Eureka {@link InstanceInfo}
     */
    public InstanceInfo getInstanceInfo() {
        return instanceInfo;
    }

    @Override
    public String getId() {
        return instanceInfo.getId();
    }

    @Override
    public URI getURI() {
        return this.uri;
    }

    @Override
    public ConvertibleValues getMetadata() {
        return ConvertibleValues.of(instanceInfo.getMetadata());
    }

    private URI createURI(InstanceInfo instanceInfo) {
        int securePort = instanceInfo.getSecurePort();
        if (securePort > 0) {
            int port = instanceInfo.getSecurePort();
            String portStr = port > 0 ? ":" + port : "";
            return URI.create("https://" + instanceInfo.getHostName() + portStr);
        } else {
            int port = instanceInfo.getPort();
            String portStr = port > 0 ? ":" + port : "";
            return URI.create("http://" + instanceInfo.getHostName() + portStr);
        }
    }

    @Override
    public String toString() {
        return instanceInfo.toString();
    }
}