Talk of ServiceReporter nacos

sequence

In this paper, we look nacos of ServiceReporter

ServiceManager.init

nacos-1.1.3/naming/src/main/java/com/alibaba/nacos/naming/core/ServiceManager.java

@Component
@DependsOn("nacosApplicationContext")
public class ServiceManager implements RecordListener<Service> {

    /**
     * Map<namespace, Map<group::serviceName, Service>>
     */
    private Map<String, Map<String, Service>> serviceMap = new ConcurrentHashMap<>();

    private LinkedBlockingDeque<ServiceKey> toBeUpdatedServicesQueue = new LinkedBlockingDeque<>(1024 * 1024);

    private Synchronizer synchronizer = new ServiceStatusSynchronizer();

    private final Lock lock = new ReentrantLock();

    @Resource(name = "consistencyDelegate")
    private ConsistencyService consistencyService;

    @Autowired
    private SwitchDomain switchDomain;

    @Autowired
    private DistroMapper distroMapper;

    @Autowired
    private ServerListManager serverListManager;

    @Autowired
    private PushService pushService;

    private final Object putServiceLock = new Object();

    @PostConstruct
    public void init() {

        UtilsAndCommons.SERVICE_SYNCHRONIZATION_EXECUTOR.schedule(new ServiceReporter(), 60000, TimeUnit.MILLISECONDS);

        UtilsAndCommons.SERVICE_UPDATE_EXECUTOR.submit(new UpdatedServiceProcessor());

        try {
            Loggers.SRV_LOG.info("listen for service meta change");
            consistencyService.listen(KeyBuilder.SERVICE_META_KEY_PREFIX, this);
        } catch (NacosException e) {
            Loggers.SRV_LOG.error("listen for service meta change failed!");
        }
    }

    //......
}
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• ServiceManager init method to UtilsAndCommons.SERVICE_SYNCHRONIZATION_EXECUTOR registered ServiceReporter

ServiceReporter

nacos-1.1.3/naming/src/main/java/com/alibaba/nacos/naming/core/ServiceManager.java

    private class ServiceReporter implements Runnable {

        @Override
        public void run() {
            try {

                Map<String, Set<String>> allServiceNames = getAllServiceNames();

                if (allServiceNames.size() <= 0) {
                    //ignore
                    return;
                }

                for (String namespaceId : allServiceNames.keySet()) {

                    ServiceChecksum checksum = new ServiceChecksum(namespaceId);

                    for (String serviceName : allServiceNames.get(namespaceId)) {
                        if (!distroMapper.responsible(serviceName)) {
                            continue;
                        }

                        Service service = getService(namespaceId, serviceName);

                        if (service == null) {
                            continue;
                        }

                        service.recalculateChecksum();

                        checksum.addItem(serviceName, service.getChecksum());
                    }

                    Message msg = new Message();

                    msg.setData(JSON.toJSONString(checksum));

                    List<Server> sameSiteServers = serverListManager.getServers();

                    if (sameSiteServers == null || sameSiteServers.size() <= 0) {
                        return;
                    }

                    for (Server server : sameSiteServers) {
                        if (server.getKey().equals(NetUtils.localServer())) {
                            continue;
                        }
                        synchronizer.send(server.getKey(), msg);
                    }
                }
            } catch (Exception e) {
                Loggers.SRV_LOG.error("[DOMAIN-STATUS] Exception while sending service status", e);
            } finally {
                UtilsAndCommons.SERVICE_SYNCHRONIZATION_EXECUTOR.schedule(this, switchDomain.getServiceStatusSynchronizationPeriodMillis(), TimeUnit.MILLISECONDS);
            }
        }
    }
复制代码

• ServiceReporter implement Runnable whose run method will traverse allServiceNames, taken serviceName distroMapper.responsible recalculate recalculateChecksum, then added to ServiceChecksum in the Message configuration, send the message using the traverse sameSiteServers synchronizer.send; UtilsAndCommons.SERVICE_SYNCHRONIZATION_EXECUTOR finally to re-register ServiceReporter

ServiceStatusSynchronizer

nacos-1.1.3/naming/src/main/java/com/alibaba/nacos/naming/misc/ServiceStatusSynchronizer.java

public class ServiceStatusSynchronizer implements Synchronizer {
    @Override
    public void send(final String serverIP, Message msg) {
        if(serverIP == null) {
            return;
        }

        Map<String,String> params = new HashMap<String, String>(10);

        params.put("statuses", msg.getData());
        params.put("clientIP", NetUtils.localServer());


        String url = "http://" + serverIP + ":" + RunningConfig.getServerPort() + RunningConfig.getContextPath() +
                UtilsAndCommons.NACOS_NAMING_CONTEXT + "/service/status";

        if (serverIP.contains(UtilsAndCommons.IP_PORT_SPLITER)) {
            url = "http://" + serverIP + RunningConfig.getContextPath() +
                    UtilsAndCommons.NACOS_NAMING_CONTEXT + "/service/status";
        }

        try {
            HttpClient.asyncHttpPostLarge(url, null, JSON.toJSONString(params), new AsyncCompletionHandler() {
                @Override
                public Integer onCompleted(Response response) throws Exception {
                    if (response.getStatusCode() != HttpURLConnection.HTTP_OK) {
                        Loggers.SRV_LOG.warn("[STATUS-SYNCHRONIZE] failed to request serviceStatus, remote server: {}", serverIP);

                        return 1;
                    }
                    return 0;
                }
            });
        } catch (Exception e) {
            Loggers.SRV_LOG.warn("[STATUS-SYNCHRONIZE] failed to request serviceStatus, remote server: " + serverIP, e);
        }

    }

    @Override
    public Message get(String serverIP, String key) {
        if(serverIP == null) {
            return null;
        }

        Map<String,String> params = new HashMap<>(10);

        params.put("key", key);

        String result;
        try {
            if (Loggers.SRV_LOG.isDebugEnabled()) {
                Loggers.SRV_LOG.debug("[STATUS-SYNCHRONIZE] sync service status from: {}, service: {}", serverIP, key);
            }
            result = NamingProxy.reqAPI(RunningConfig.getContextPath()
                + UtilsAndCommons.NACOS_NAMING_CONTEXT + "/instance/" + "statuses", params, serverIP);
        } catch (Exception e) {
            Loggers.SRV_LOG.warn("[STATUS-SYNCHRONIZE] Failed to get service status from " + serverIP, e);
            return null;
        }

        if(result == null || result.equals(StringUtils.EMPTY)) {
            return null;
        }

        Message msg = new Message();
        msg.setData(result);

        return msg;
    }
}
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• Synchronizer ServiceStatusSynchronizer implements an interface, which method will be executed asynchronously send post request, the target server notifies the statuses

summary

ServiceReporter implement Runnable whose run method will traverse allServiceNames, taken serviceName distroMapper.responsible recalculate recalculateChecksum, then added to ServiceChecksum in the Message configuration, send the message using the traverse sameSiteServers synchronizer.send; UtilsAndCommons.SERVICE_SYNCHRONIZATION_EXECUTOR finally to re-register ServiceReporter

doc

• ServiceManager