服务端处理
服务端通过 /instance/list 接口来处理服务实例信息查询请求。首先服务实例信息都是被存储在 ConcurrentHashMap 中
/** * Map(namespace, Map(group::serviceName, Service)). */ private final Map<String, Map<String, Service>> serviceMap = new ConcurrentHashMap<>();
在我们查询的过程中主要是通过 ServiceManager 来进行管理， 核心的入口方法在 InstanceController#doSrvIpxt 中
public ObjectNode doSrvIpxt(String namespaceId, String serviceName, String agent, String clusters, String clientIP, int udpPort, String env, boolean isCheck, String app, String tid, boolean healthyOnly) throws Exception { ClientInfo clientInfo = new ClientInfo(agent); ObjectNode result = JacksonUtils.createEmptyJsonNode(); Service service = serviceManager.getService(namespaceId, serviceName); long cacheMillis = switchDomain.getDefaultCacheMillis(); // now try to enable the push try { if (udpPort > 0 && pushService.canEnablePush(agent)) { pushService .addClient(namespaceId, serviceName, clusters, agent, new InetSocketAddress(clientIP, udpPort), pushDataSource, tid, app); cacheMillis = switchDomain.getPushCacheMillis(serviceName); } } catch (Exception e) { Loggers.SRV_LOG .error("[NACOS-API] failed to added push client {}, {}:{}", clientInfo, clientIP, udpPort, e); cacheMillis = switchDomain.getDefaultCacheMillis(); } if (service == null) { if (Loggers.SRV_LOG.isDebugEnabled()) { Loggers.SRV_LOG.debug("no instance to serve for service: {}", serviceName); } result.put("name", serviceName); result.put("clusters", clusters); result.put("cacheMillis", cacheMillis); result.replace("hosts", JacksonUtils.createEmptyArrayNode()); return result; } checkIfDisabled(service); List<Instance> srvedIPs; // 查询所有的服务 // 内部会更新服务列表 // allInstances.addAll(persistentInstances); // allInstances.addAll(ephemeralInstances); srvedIPs = service.srvIPs(Arrays.asList(StringUtils.split(clusters, ","))); // filter ips using selector: if (service.getSelector() != null && StringUtils.isNotBlank(clientIP)) { srvedIPs = service.getSelector().select(clientIP, srvedIPs); } if (CollectionUtils.isEmpty(srvedIPs)) { if (Loggers.SRV_LOG.isDebugEnabled()) { Loggers.SRV_LOG.debug("no instance to serve for service: {}", serviceName); } if (clientInfo.type == ClientInfo.ClientType.JAVA && clientInfo.version.compareTo(VersionUtil.parseVersion("1.0.0")) >= 0) { result.put("dom", serviceName); } else { result.put("dom", NamingUtils.getServiceName(serviceName)); } result.put("name", serviceName); result.put("cacheMillis", cacheMillis); result.put("lastRefTime", System.currentTimeMillis()); result.put("checksum", service.getChecksum()); result.put("useSpecifiedURL", false); result.put("clusters", clusters); result.put("env", env); result.set("hosts", JacksonUtils.createEmptyArrayNode()); result.set("metadata", JacksonUtils.transferToJsonNode(service.getMetadata())); return result; } Map<Boolean, List<Instance>> ipMap = new HashMap<>(2); ipMap.put(Boolean.TRUE, new ArrayList<>()); ipMap.put(Boolean.FALSE, new ArrayList<>()); for (Instance ip : srvedIPs) { ipMap.get(ip.isHealthy()).add(ip); } if (isCheck) { result.put("reachProtectThreshold", false); } double threshold = service.getProtectThreshold(); if ((float) ipMap.get(Boolean.TRUE).size() / srvedIPs.size() <= threshold) { Loggers.SRV_LOG.warn("protect threshold reached, return all ips, service: {}", serviceName); if (isCheck) { result.put("reachProtectThreshold", true); } ipMap.get(Boolean.TRUE).addAll(ipMap.get(Boolean.FALSE)); ipMap.get(Boolean.FALSE).clear(); } if (isCheck) { result.put("protectThreshold", service.getProtectThreshold()); result.put("reachLocalSiteCallThreshold", false); return JacksonUtils.createEmptyJsonNode(); } ArrayNode hosts = JacksonUtils.createEmptyArrayNode(); for (Map.Entry<Boolean, List<Instance>> entry : ipMap.entrySet()) { List<Instance> ips = entry.getValue(); if (healthyOnly && !entry.getKey()) { continue; } for (Instance instance : ips) { // remove disabled instance: if (!instance.isEnabled()) { continue; } ObjectNode ipObj = JacksonUtils.createEmptyJsonNode(); ipObj.put("ip", instance.getIp()); ipObj.put("port", instance.getPort()); // deprecated since nacos 1.0.0: ipObj.put("valid", entry.getKey()); ipObj.put("healthy", entry.getKey()); ipObj.put("marked", instance.isMarked()); ipObj.put("instanceId", instance.getInstanceId()); ipObj.set("metadata", JacksonUtils.transferToJsonNode(instance.getMetadata())); ipObj.put("enabled", instance.isEnabled()); ipObj.put("weight", instance.getWeight()); ipObj.put("clusterName", instance.getClusterName()); if (clientInfo.type == ClientInfo.ClientType.JAVA && clientInfo.version.compareTo(VersionUtil.parseVersion("1.0.0")) >= 0) { ipObj.put("serviceName", instance.getServiceName()); } else { ipObj.put("serviceName", NamingUtils.getServiceName(instance.getServiceName())); } ipObj.put("ephemeral", instance.isEphemeral()); hosts.add(ipObj); } } result.replace("hosts", hosts); if (clientInfo.type == ClientInfo.ClientType.JAVA && clientInfo.version.compareTo(VersionUtil.parseVersion("1.0.0")) >= 0) { result.put("dom", serviceName); } else { result.put("dom", NamingUtils.getServiceName(serviceName)); } result.put("name", serviceName); result.put("cacheMillis", cacheMillis); result.put("lastRefTime", System.currentTimeMillis()); result.put("checksum", service.getChecksum()); result.put("useSpecifiedURL", false); result.put("clusters", clusters); result.put("env", env); result.replace("metadata", JacksonUtils.transferToJsonNode(service.getMetadata())); return result; }
在上面的核心逻辑主要是：
- 调用 service.srvIPs 方法查询所有的服务实例信息
Cluster#allIPs会将所有的服务注册信息写到服务注册列表。
