【Java】Nacos - 服务端处理注册请求

Nacos - 客户端注册已经讲过了，那这里讲一下服务端是怎么处理请求的。
处理客户的请求在InstanceController里，我们看看register方法。

InstanceController#register

这里主要是封装Instance，并调用serviceManager的registerInstance方法进行服务注册。

public String register(HttpServletRequest request) throws Exception {
// 获取namespaceId
final String namespaceId = WebUtils
.optional(request, CommonParams.NAMESPACE_ID, Constants.DEFAULT_NAMESPACE_ID);
// 获取serviceName
final String serviceName = WebUtils.required(request, CommonParams.SERVICE_NAME);
// 验证serviceName的合法性
NamingUtils.checkServiceNameFormat(serviceName);
// 封装并验证Instance的合法性
final Instance instance = parseInstance(request);
// 服务注册
serviceManager.registerInstance(namespaceId, serviceName, instance);
return "ok";
}

ServiceManager#registerInstance

判断是否已经注册过，如果没有注册，则创建一个Service并注册，然后再添加实例。

public void registerInstance(String namespaceId, String serviceName, Instance instance) throws NacosException {
// 是否已经注册过，如果没有注册，则创建一个Service并注册
createEmptyService(namespaceId, serviceName, instance.isEphemeral());
// 从注册的服务中取Service
Service service = getService(namespaceId, serviceName);
if (service == null) {
throw new NacosException(NacosException.INVALID_PARAM,
"service not found, namespace: " + namespaceId + ", service: " + serviceName);
}
// 添加实例
addInstance(namespaceId, serviceName, instance.isEphemeral(), instance);
}

ServiceManager#createEmptyService

直接调用createServiceIfAbsent方法。

public void createEmptyService(String namespaceId, String serviceName, boolean local) throws NacosException {
createServiceIfAbsent(namespaceId, serviceName, local, null);
}

ServiceManager#createServiceIfAbsent

public void createServiceIfAbsent(String namespaceId, String serviceName, boolean local, Cluster cluster)
throws NacosException {
// 获取Service
Service service = getService(namespaceId, serviceName);
if (service == null) {
// 没有获取到则创建
Loggers.SRV_LOG.info("creating empty service {}:{}", namespaceId, serviceName);
service = new Service();
service.setName(serviceName);
service.setNamespaceId(namespaceId);
service.setGroupName(NamingUtils.getGroupName(serviceName));
// now validate the service. if failed, exception will be thrown
service.setLastModifiedMillis(System.currentTimeMillis());
// checksum用于校验的
service.recalculateChecksum();
if (cluster != null) {
// 加入到集群
cluster.setService(service);
service.getClusterMap().put(cluster.getName(), cluster);
}
// 验证服务和集群名称的合法性
service.validate();
// 放入缓存并检查心跳
putServiceAndInit(service);
if (!local) {
// 一致性协议保存
addOrReplaceService(service);
}
}
}

ServiceManager#putServiceAndInit

Service存入serviceMap缓存，并每5秒健康检查

private void putServiceAndInit(Service service) throws NacosException {
// 存入serviceMap缓存
putService(service);
// 每5秒健康检查，包括service和cluster
service.init();
// 添加监听，包括临时和永久
consistencyService
.listen(KeyBuilder.buildInstanceListKey(service.getNamespaceId(), service.getName(), true), service);
consistencyService
.listen(KeyBuilder.buildInstanceListKey(service.getNamespaceId(), service.getName(), false), service);
Loggers.SRV_LOG.info("[NEW-SERVICE] {}", service.toJson());
}

ServiceManager#getService

从serviceMap缓存中取值。

public Service getService(String namespaceId, String serviceName) {
if (serviceMap.get(namespaceId) == null) {
return null;
}
return chooseServiceMap(namespaceId).get(serviceName);
}
public Map<String, Service> chooseServiceMap(String namespaceId) {
return serviceMap.get(namespaceId);
}

ServiceManager#addInstance

保存实例

public void addInstance(String namespaceId, String serviceName, boolean ephemeral, Instance... ips)
throws NacosException {
// 获取实例key
String key = KeyBuilder.buildInstanceListKey(namespaceId, serviceName, ephemeral);
// 从缓存serviceMap获取Service
Service service = getService(namespaceId, serviceName);
synchronized (service) {
// 获取service的所有实例
List<Instance> instanceList = addIpAddresses(service, ephemeral, ips);
Instances instances = new Instances();
instances.setInstanceList(instanceList);
// 一致性保存，实际调用DistroConsistencyServiceImpl#put
consistencyService.put(key, instances);
}
}

ServiceManager#addIpAddresses

直接调用updateIpAddresses方法

private List<Instance> addIpAddresses(Service service, boolean ephemeral, Instance... ips) throws NacosException {
return updateIpAddresses(service, UtilsAndCommons.UPDATE_INSTANCE_ACTION_ADD, ephemeral, ips);
}

ServiceManager#updateIpAddresses

获取service的所有实例，这里会更新老数据

public List<Instance> updateIpAddresses(Service service, String action, boolean ephemeral, Instance... ips)
throws NacosException {
// 获取旧数据
Datum datum = consistencyService
.get(KeyBuilder.buildInstanceListKey(service.getNamespaceId(), service.getName(), ephemeral));
// 获取集群中所有的实例
List<Instance> currentIPs = service.allIPs(ephemeral);
Map<String, Instance> currentInstances = new HashMap<>(currentIPs.size());
Set<String> currentInstanceIds = Sets.newHashSet();
// 遍历所有实例，key为ip+端口
for (Instance instance : currentIPs) {
currentInstances.put(instance.toIpAddr(), instance);
currentInstanceIds.add(instance.getInstanceId());
}
// 定义新数据
Map<String, Instance> instanceMap;
if (datum != null && null != datum.value) {
// 如果有老数据，通过currentInstances来更新健康状态和心跳时间
instanceMap = setValid(((Instances) datum.value).getInstanceList(), currentInstances);
} else {
// 没有就创建一个
instanceMap = new HashMap<>(ips.length);
}
for (Instance instance : ips) {
// 不存在，就创建一个Cluster集群，并开启健康检查
if (!service.getClusterMap().containsKey(instance.getClusterName())) {
// 重新创建一个
Cluster cluster = new Cluster(instance.getClusterName(), service);
// 开启健康检查
cluster.init();
service.getClusterMap().put(instance.getClusterName(), cluster);
Loggers.SRV_LOG
.warn("cluster: {} not found, ip: {}, will create new cluster with default configuration.",
instance.getClusterName(), instance.toJson());
}
// 删除操作的话，就删除实例
if (UtilsAndCommons.UPDATE_INSTANCE_ACTION_REMOVE.equals(action)) {
instanceMap.remove(instance.getDatumKey());
} else {
// 新增实例，设置唯一id
instance.setInstanceId(instance.generateInstanceId(currentInstanceIds));
instanceMap.put(instance.getDatumKey(), instance);
}
}
if (instanceMap.size() <= 0 && UtilsAndCommons.UPDATE_INSTANCE_ACTION_ADD.equals(action)) {
throw new IllegalArgumentException(
"ip list can not be empty, service: " + service.getName() + ", ip list: " + JacksonUtils
.toJson(instanceMap.values()));
}
// 返回所有实例
return new ArrayList<>(instanceMap.values());
}

DistroConsistencyServiceImpl#put

如果是临时，则加入缓存，并放入阻塞队列。

public void put(String key, Record value) throws NacosException {
onPut(key, value);
// 一致性服务
distroProtocol.sync(new DistroKey(key, KeyBuilder.INSTANCE_LIST_KEY_PREFIX), DataOperation.CHANGE,
globalConfig.getTaskDispatchPeriod() / 2);
}
public void onPut(String key, Record value) {
// 临时加入dataStore缓存
if (KeyBuilder.matchEphemeralInstanceListKey(key)) {
Datum<Instances> datum = new Datum<>();
datum.value = (Instances) value;
datum.key = key;
datum.timestamp.incrementAndGet();
dataStore.put(key, datum);
}
if (!listeners.containsKey(key)) {
return;
}
// 在notifier的阻塞队列加入ArrayBlockingQueue
notifier.addTask(key, DataOperation.CHANGE);
}

DistroConsistencyServiceImp.Notifierl#run

调用handle方法

@Override
public void run() {
Loggers.DISTRO.info("distro notifier started");
for (; ; ) {
try {
Pair<String, DataOperation> pair = tasks.take();
handle(pair);
} catch (Throwable e) {
Loggers.DISTRO.error("[NACOS-DISTRO] Error while handling notifying task", e);
}
}
}

DistroConsistencyServiceImp.Notifierl#handle

对事件进行通知

private void handle(Pair<String, DataOperation> pair) {
try {
String datumKey = pair.getValue0();
DataOperation action = pair.getValue1();
services.remove(datumKey);
int count = 0;
// 没有监听，返回
if (!listeners.containsKey(datumKey)) {
return;
}
for (RecordListener listener : listeners.get(datumKey)) {
count++;
try {
if (action == DataOperation.CHANGE) {
// 处理变更事件
listener.onChange(datumKey, dataStore.get(datumKey).value);
continue;
}
if (action == DataOperation.DELETE) {
// 处理删除事件
listener.onDelete(datumKey);
continue;
}
} catch (Throwable e) {
Loggers.DISTRO.error("[NACOS-DISTRO] error while notifying listener of key: {}", datumKey, e);
}
}
if (Loggers.DISTRO.isDebugEnabled()) {
Loggers.DISTRO
.debug("[NACOS-DISTRO] datum change notified, key: {}, listener count: {}, action: {}",
datumKey, count, action.name());
}
} catch (Throwable e) {
Loggers.DISTRO.error("[NACOS-DISTRO] Error while handling notifying task", e);
}
}

总结

  1. 服务、集群如果不存在，则创建，并注册监听事件。

  2. 开启服务、集群的健康检查。

  3. 如果有旧服务数据，则更新健康状态和心跳时间。

  4. 节点的数据一致性。

  5. 调用监听。

【Java】Nacos - 服务端处理注册请求

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