Spring Cloud实战小贴士：turbine如何聚合设置了context-path的hystrix数据

程序猿DD

发布于 2018-02-01 15:45:39

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发布于 2018-02-01 15:45:39

文章被收录于专栏：程序猿DD

之前在spring for all社区看到这样一个问题：当actuator端点设置了context-path之后，turbine如何聚合数据？首先，我们要知道actuator端点设置了context-path是什么意思？也就是说，此时spring boot actuator的端点都有了一个前缀，比如：

management.context-path=/xxx

如果设置了上面的参数，那个对于收集hystrix数据的端点将变为：/xxx/hystrix.stream，如果我们还是拿上一篇Spring Cloud构建微服务架构：Hystrix监控数据聚合【Dalston版】中构建你的turbine应用，那么将会看到如下错误：

INFO 7812 --- [        Timer-0] c.n.t.monitor.instance.InstanceMonitor   : Url for host: http://172.15.0.18:9020/hystrix.stream default

ERROR 7812 --- [InstanceMonitor] c.n.t.monitor.instance.InstanceMonitor   : Could not initiate connection to host, giving up: [{"timestamp":1499941336284,"status":404,"error":"Not Found","message":"No message available","path":"/hystrix.stream"}]

WARN 7812 --- [InstanceMonitor] c.n.t.monitor.instance.InstanceMonitor   : Stopping InstanceMonitor for: 172.15.0.18:9020 default

com.netflix.turbine.monitor.instance.InstanceMonitor$MisconfiguredHostException: [{"timestamp":1499941336284,"status":404,"error":"Not Found","message":"No message available","path":"/hystrix.stream"}]

	at com.netflix.turbine.monitor.instance.InstanceMonitor.init(InstanceMonitor.java:318) ~[turbine-core-1.0.0.jar:na]

	at com.netflix.turbine.monitor.instance.InstanceMonitor.access$100(InstanceMonitor.java:103) ~[turbine-core-1.0.0.jar:na]

	at com.netflix.turbine.monitor.instance.InstanceMonitor$2.call(InstanceMonitor.java:235) [turbine-core-1.0.0.jar:na]

	at com.netflix.turbine.monitor.instance.InstanceMonitor$2.call(InstanceMonitor.java:229) [turbine-core-1.0.0.jar:na]

	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_91]

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_91]

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_91]

	at java.lang.Thread.run(Thread.java:745) [na:1.8.0_91]

从上述错误中我们可以知道，turbine在收集的时候由于访问的是/hystrix.stream，而此时收集端点却是/xxx/hystrix.stream，所以报了404错误。

那么我们要如何解决呢？通过之前的配置内容，我们可能找不到相关的配置信息，所以只能遍历一下源码，最后找到这个类：org.springframework.cloud.netflix.turbine.SpringClusterMonitor。它的具体内容如下：

public static InstanceUrlClosure ClusterConfigBasedUrlClosure = new InstanceUrlClosure() {

private final DynamicStringProperty defaultUrlClosureConfig = DynamicPropertyFactory

			.getInstance().getStringProperty("turbine.instanceUrlSuffix",

				    	"hystrix.stream");

private final DynamicBooleanProperty instanceInsertPort = DynamicPropertyFactory

				.getInstance().getBooleanProperty("turbine.instanceInsertPort", true);

@Override

public String getUrlPath(Instance host) {

if (host.getCluster() == null) {

throw new RuntimeException(

"Host must have cluster name in order to use ClusterConfigBasedUrlClosure");

		}

// find url

		String key = "turbine.instanceUrlSuffix." + host.getCluster();

		DynamicStringProperty urlClosureConfig = DynamicPropertyFactory.getInstance()

					.getStringProperty(key, null);

		String url = urlClosureConfig.get();

if (url == null) {

			url = this.defaultUrlClosureConfig.get();

		}

if (url == null) {

throw new RuntimeException("Config property: "

					+ urlClosureConfig.getName() + " or "

					+ this.defaultUrlClosureConfig.getName() + " must be set");

		}

// find port and scheme

		String port;

		String scheme;

if (host.getAttributes().containsKey("securePort")) {

			port = host.getAttributes().get("securePort");

			scheme = "https";

		} else {

			port = host.getAttributes().get("port");

			scheme = "http";

		}

if (host.getAttributes().containsKey("fusedHostPort")) {

return String.format("%s://%s/%s", scheme, host.getAttributes().get("fusedHostPort"), url);

		}

// determine if to insert port

		String insertPortKey = "turbine.instanceInsertPort." + host.getCluster();

		DynamicStringProperty insertPortProp = DynamicPropertyFactory.getInstance()

					.getStringProperty(insertPortKey, null);

boolean insertPort;

if (insertPortProp.get() == null) {

			insertPort = this.instanceInsertPort.get();

		}

else {

			insertPort = Boolean.parseBoolean(insertPortProp.get());

		}

// format url with port

if (insertPort) {

if (url.startsWith("/")) {

				url = url.substring(1);

			}

if (port == null) {

throw new RuntimeException(

"Configured to use port, but port or securePort is not in host attributes");

			}

return String.format("%s://%s:%s/%s", scheme, host.getHostname(), port, url);

		}

//format url without port

return scheme + "://" + host.getHostname() + url;

	}

};

从上述源码中，我们可以找到这个参数turbine.instanceUrlSuffix，由此该问题就迎刃而解了，我们只需要在turbine应用的配置文件中增加如下配置信息，就能正确的收集之前配置了management.context-path=/xxx的微服务的hystrix数据了。