[英]How to enable automatic routing in Netflix/Zuul and Netflix/Ribbon with discovery information from Netflix/Eureka Service?
[英]How to locate services by version with Netflix eureka and ribbon
我們目前正在探索Netflix的Flux Capacitor來研究它們的微服務架構的實現。 目前,我們的興趣主要集中在服務注冊和動態查找功能上。
瀏覽代碼,示例和配置,但有些事情並不清楚; 服務版本控制 。 如果eureka提供發現服務,而ribbon是基於eureka的REST客戶端,那么客戶如何說它需要服務fooBar
服務1.2
? 客戶端在哪里存儲/獲取該版本號; 從像本地配置文件此 ,抑或是通過動態地獲得的archaius ?
我在Eureka REST API的文檔中看不到任何處理服務版本的內置方式。
因此,我認為處理此問題的最佳方法是在您的服務ID中加入版本控制信息。
假設我們有4項服務: 用戶 , 統計 , 登錄和oAuth 。
我們剛剛更新了用戶服務API,以更改登錄服務中某些新要求所需的功能。 但是,這些更改與oAuth正在使用的API不兼容,沒有人有時間更新該服務。 統計服務未使用任何此功能,因此它不關心使用哪個版本的API。 這意味着我們需要同時運行新版本的用戶服務(1.2)和舊版本(1.1)。
我們可以像這樣設置:
這樣, oAuth服務將僅與舊用戶服務,具有新用戶服務的登錄服務以及具有任何用戶服務的統計服務進行通信。
您應該能夠使用Archaius將配置傳播到服務器。
請注意,如果您發布的用戶版本1.3引入了與統計服務正在使用的1.2和1.1部分不兼容的更改,您將要告訴用戶 1.1和1.2服務將其自身注冊為其他內容(例如“user-statistics” -safe“)並告訴Statistics服務使用該ID,或告訴Statistics服務使用”user-1.1“或”user-1.2“。
服務1向Eureka注冊v1和v2
服務2使用不同的Ribbon客戶端發現並向Service 1的v1和v2發送請求
我使用Spring Cloud
了這個演示,雖然博客可以在以下網址找到: http : //tech.asimio.net/2017/03/06/Multi-version-Service-Discovery-using-Spring-Cloud-Netflix-Eureka-and -Ribbon.html
我遵循的想法是讓RestTemplate
為每個版本使用不同的Ribbon
客戶端,因為每個客戶端都有自己的ServerListFilter
。
多版本服務包括注冊元數據中的版本。
服務1
application.yml
...
eureka:
client:
registerWithEureka: true
fetchRegistry: true
serviceUrl:
defaultZone: http://localhost:8000/eureka/
instance:
hostname: ${hostName}
statusPageUrlPath: ${management.context-path}/info
healthCheckUrlPath: ${management.context-path}/health
preferIpAddress: true
metadataMap:
instanceId: ${spring.application.name}:${server.port}
---
spring:
profiles: v1
eureka:
instance:
metadataMap:
versions: v1
---
spring:
profiles: v1v2
eureka:
instance:
metadataMap:
versions: v1,v2
...
服務2
application.yml
...
eureka:
client:
registerWithEureka: false
fetchRegistry: true
serviceUrl:
defaultZone: http://localhost:8000/eureka/
demo-multiversion-registration-api-1-v1:
ribbon:
# Eureka vipAddress of the target service
DeploymentContextBasedVipAddresses: demo-multiversion-registration-api-1
NIWSServerListClassName: com.netflix.niws.loadbalancer.DiscoveryEnabledNIWSServerList
# Interval to refresh the server list from the source (ms)
ServerListRefreshInterval: 30000
demo-multiversion-registration-api-1-v2:
ribbon:
# Eureka vipAddress of the target service
DeploymentContextBasedVipAddresses: demo-multiversion-registration-api-1
NIWSServerListClassName: com.netflix.niws.loadbalancer.DiscoveryEnabledNIWSServerList
# Interval to refresh the server list from the source (ms)
ServerListRefreshInterval: 30000
...
Application.java
...
@SpringBootApplication(scanBasePackages = {
"com.asimio.api.multiversion.demo2.config",
"com.asimio.api.multiversion.demo2.rest"
})
@EnableDiscoveryClient
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
AppConfig.java (查看Ribbon
客戶端名稱與application.yml中找到的Ribbon
鍵的匹配方式
...
@Configuration
@RibbonClients(value = {
@RibbonClient(name = "demo-multiversion-registration-api-1-v1", configuration = RibbonConfigDemoApi1V1.class),
@RibbonClient(name = "demo-multiversion-registration-api-1-v2", configuration = RibbonConfigDemoApi1V2.class)
})
public class AppConfig {
@Bean(name = "loadBalancedRestTemplate")
@LoadBalanced
public RestTemplate loadBalancedRestTemplate() {
return new RestTemplate();
}
}
RibbonConfigDemoApi1V1.java
...
public class RibbonConfigDemoApi1V1 {
private DiscoveryClient discoveryClient;
@Bean
public ServerListFilter<Server> serverListFilter() {
return new VersionedNIWSServerListFilter<>(this.discoveryClient, RibbonClientApi.DEMO_REGISTRATION_API_1_V1);
}
@Autowired
public void setDiscoveryClient(DiscoveryClient discoveryClient) {
this.discoveryClient = discoveryClient;
}
}
RibbonConfigDemoApi1V2.java類似但使用RibbonClientApi.DEMO_REGISTRATION_API_1_V2
RibbonClientApi.java
...
public enum RibbonClientApi {
DEMO_REGISTRATION_API_1_V1("demo-multiversion-registration-api-1", "v1"),
DEMO_REGISTRATION_API_1_V2("demo-multiversion-registration-api-1", "v2");
public final String serviceId;
public final String version;
private RibbonClientApi(String serviceId, String version) {
this.serviceId = serviceId;
this.version = version;
}
}
VersionedNIWSServerListFilter.java
...
public class VersionedNIWSServerListFilter<T extends Server> extends DefaultNIWSServerListFilter<T> {
private static final String VERSION_KEY = "versions";
private final DiscoveryClient discoveryClient;
private final RibbonClientApi ribbonClientApi;
public VersionedNIWSServerListFilter(DiscoveryClient discoveryClient, RibbonClientApi ribbonClientApi) {
this.discoveryClient = discoveryClient;
this.ribbonClientApi = ribbonClientApi;
}
@Override
public List<T> getFilteredListOfServers(List<T> servers) {
List<T> result = new ArrayList<>();
List<ServiceInstance> serviceInstances = this.discoveryClient.getInstances(this.ribbonClientApi.serviceId);
for (ServiceInstance serviceInstance : serviceInstances) {
List<String> versions = this.getInstanceVersions(serviceInstance);
if (versions.isEmpty() || versions.contains(this.ribbonClientApi.version)) {
result.addAll(this.findServerForVersion(servers, serviceInstance));
}
}
return result;
}
private List<String> getInstanceVersions(ServiceInstance serviceInstance) {
List<String> result = new ArrayList<>();
String rawVersions = serviceInstance.getMetadata().get(VERSION_KEY);
if (StringUtils.isNotBlank(rawVersions)) {
result.addAll(Arrays.asList(rawVersions.split(",")));
}
return result;
}
...
AggregationResource.java
...
@RestController
@RequestMapping(value = "/aggregation", produces = "application/json")
public class AggregationResource {
private static final String ACTORS_SERVICE_ID_V1 = "demo-multiversion-registration-api-1-v1";
private static final String ACTORS_SERVICE_ID_V2 = "demo-multiversion-registration-api-1-v2";
private RestTemplate loadBalancedRestTemplate;
@RequestMapping(value = "/v1/actors/{id}", method = RequestMethod.GET)
public com.asimio.api.multiversion.demo2.model.v1.Actor findActorV1(@PathVariable(value = "id") String id) {
String url = String.format("http://%s/v1/actors/{id}", ACTORS_SERVICE_ID_V1);
return this.loadBalancedRestTemplate.getForObject(url, com.asimio.api.multiversion.demo2.model.v1.Actor.class, id);
}
@RequestMapping(value = "/v2/actors/{id}", method = RequestMethod.GET)
public com.asimio.api.multiversion.demo2.model.v2.Actor findActorV2(@PathVariable(value = "id") String id) {
String url = String.format("http://%s/v2/actors/{id}", ACTORS_SERVICE_ID_V2);
return this.loadBalancedRestTemplate.getForObject(url, com.asimio.api.multiversion.demo2.model.v2.Actor.class, id);
}
@Autowired
public void setLoadBalancedRestTemplate(RestTemplate loadBalancedRestTemplate) {
this.loadBalancedRestTemplate = loadBalancedRestTemplate;
}
}
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