/*
* Copyright 2013-2014 the original author or 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 org.springframework.cloud.netflix.eureka;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.springframework.boot.actuate.health.Health;
import org.springframework.boot.actuate.health.Health.Builder;
import org.springframework.boot.actuate.health.Status;
import org.springframework.cloud.client.discovery.health.DiscoveryHealthIndicator;
import com.netflix.appinfo.EurekaInstanceConfig;
import com.netflix.discovery.DiscoveryClient;
import com.netflix.discovery.EurekaClient;
import com.netflix.discovery.EurekaClientConfig;
import com.netflix.discovery.shared.Application;
import com.netflix.discovery.shared.Applications;
/**
* @author Dave Syer
*/
public class EurekaHealthIndicator implements DiscoveryHealthIndicator {
private final EurekaClient eurekaClient;
private final EurekaInstanceConfig instanceConfig;
private final EurekaClientConfig clientConfig;
public EurekaHealthIndicator(EurekaClient eurekaClient,
EurekaInstanceConfig instanceConfig, EurekaClientConfig clientConfig) {
super();
this.eurekaClient = eurekaClient;
this.instanceConfig = instanceConfig;
this.clientConfig = clientConfig;
}
@Override
public String getName() {
return "eureka";
}
@Override
public Health health() {
Builder builder = Health.unknown();
Status status = getStatus(builder);
return builder.status(status).withDetail("applications", getApplications())
.build();
}
private Status getStatus(Builder builder) {
Status status = new Status(
this.eurekaClient.getInstanceRemoteStatus().toString(),
"Remote status from Eureka server");
if (eurekaClient instanceof DiscoveryClient && clientConfig.shouldFetchRegistry()) {
DiscoveryClient discoveryClient = (DiscoveryClient) eurekaClient;
long lastFetch = discoveryClient.getLastSuccessfulRegistryFetchTimePeriod();
if (lastFetch < 0) {
status = new Status("UP",
"Eureka discovery client has not yet successfully connected to a Eureka server");
}
else if (lastFetch > clientConfig.getRegistryFetchIntervalSeconds() * 2000) {
status = new Status("UP",
"Eureka discovery client is reporting failures to connect to a Eureka server");
builder.withDetail("renewalPeriod",
instanceConfig.getLeaseRenewalIntervalInSeconds());
builder.withDetail("failCount",
lastFetch / clientConfig.getRegistryFetchIntervalSeconds());
}
}
return status;
}
private Map<String, Object> getApplications() {
Applications applications = this.eurekaClient.getApplications();
if (applications == null) {
return Collections.emptyMap();
}
Map<String, Object> result = new HashMap<>();
for (Application application : applications.getRegisteredApplications()) {
result.put(application.getName(), application.getInstances().size());
}
return result;
}
}