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springcloud基于ribbon的canary路由方案
思路
根据eureka的metadata进行自定义元数据,然后使用ribbon对该元数据进行过滤和匹配,选择server。
实现
这里使用header来传递路由信息,改造ribbon-discovery-filter-spring-cloud-starter,使其不影响静态server list。
filter
public class TagFilter extends ZuulFilter { private static final Logger LOGGER = LoggerFactory.getLogger(TagFilter.class); @Override public String filterType() { return "pre"; } @Override public int filterOrder() { return 7; } @Override public boolean shouldFilter() { return true; } @Override public Object run() { RequestContext requestContext = RequestContext.getCurrentContext(); HttpServletRequest request = requestContext.getRequest(); String tag = request.getHeader("tag"); RibbonFilterContextHolder.getCurrentContext().add("tag", tag); LOGGER.info("route {} to {}",request.getRequestURI(),tag); return null; } }
predicate
public class MetadataAwarePredicate extends AbstractServerPredicate{ @Override public boolean apply(PredicateKey input) { if(input == null || !(input.getServer() instanceof DiscoveryEnabledServer)){ return true; } DiscoveryEnabledServer server = (DiscoveryEnabledServer) input.getServer(); final RibbonFilterContext context = RibbonFilterContextHolder.getCurrentContext(); final Set<Map.Entry<String, String>> attributes = Collections.unmodifiableSet(context.getAttributes().entrySet()); final Map<String, String> metadata =http://www.mamicode.com/ server.getInstanceInfo().getMetadata(); return metadata.entrySet().containsAll(attributes); } }
rule
public class MetadataAwareRule extends ZoneAvoidanceRule { @Override public AbstractServerPredicate getPredicate() { return new MetadataAwarePredicate(); } }
autoconfig
@Configuration @ConditionalOnClass(DiscoveryEnabledNIWSServerList.class) @AutoConfigureBefore(RibbonClientConfiguration.class) @ConditionalOnProperty(value = "ribbon.filter.metadata.enabled", matchIfMissing = true) public class RibbonMetaFilterAutoConfiguration { @Bean @ConditionalOnMissingBean @Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE) public MetadataAwareRule metadataAwareRule() { return new MetadataAwareRule(); } }
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springcloud基于ribbon的canary路由方案
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