一、简介
- 本文主要介绍dubbo 里面和服务disable相关的源码流程，方便以后出问题快速定位原因；
- 之前是一套注册中心zk集群，dubbo版本2.7.3，dubbo-admin启用禁用没有问题，现在升级dubbo版本为2.7.22，zk集群搞了2套，发现disable和enable没用了，禁用了依然可以调用，遂研究了下关于disable的相关源码，记录一下，方便后续问题排查。
- 图片看不清楚的滚轮放大把，博客园这块支持的，我吐槽6点......
二、核心流程
2.1 核心流程图
三、服务启动初始化暴露
3.1 DubboBootstrap初始化流程
3.2 DubboBootstrap暴露服务过程
点击查看代码
private void doExportUrlsFor1Protocol(ProtocolConfig protocolConfig, List<URL> registryURLs, int protocolConfigNum) {
String name = protocolConfig.getName();
if (StringUtils.isEmpty(name)) {
name = DUBBO;
}
Map<String, String> map = new HashMap<String, String>();
map.put(SIDE_KEY, PROVIDER_SIDE);
ServiceConfig.appendRuntimeParameters(map);
AbstractConfig.appendParameters(map, getMetrics());
AbstractConfig.appendParameters(map, getApplication());
AbstractConfig.appendParameters(map, getModule());
// remove 'default.' prefix for configs from ProviderConfig
// appendParameters(map, provider, Constants.DEFAULT_KEY);
AbstractConfig.appendParameters(map, provider);
AbstractConfig.appendParameters(map, protocolConfig);
AbstractConfig.appendParameters(map, this);
MetadataReportConfig metadataReportConfig = getMetadataReportConfig();
if (metadataReportConfig != null && metadataReportConfig.isValid()) {
map.putIfAbsent(METADATA_KEY, REMOTE_METADATA_STORAGE_TYPE);
}
if (CollectionUtils.isNotEmpty(getMethods())) {
for (MethodConfig method : getMethods()) {
AbstractConfig.appendParameters(map, method, method.getName());
String retryKey = method.getName() + RETRY_SUFFIX;
if (map.containsKey(retryKey)) {
String retryValue = map.remove(retryKey);
if (FALSE_VALUE.equals(retryValue)) {
map.put(method.getName() + RETRIES_SUFFIX, ZERO_VALUE);
}
}
List<ArgumentConfig> arguments = method.getArguments();
if (CollectionUtils.isNotEmpty(arguments)) {
for (ArgumentConfig argument : arguments) {
// convert argument type
if (argument.getType() != null && argument.getType().length() > 0) {
Method[] methods = interfaceClass.getMethods();
// visit all methods
if (methods.length > 0) {
for (int i = 0; i < methods.length; i++) {
String methodName = methods[i].getName();
// target the method, and get its signature
if (methodName.equals(method.getName())) {
Class<?>[] argtypes = methods[i].getParameterTypes();
// one callback in the method
if (argument.getIndex() != -1) {
if (argtypes[argument.getIndex()].getName().equals(argument.getType())) {
AbstractConfig
.appendParameters(map, argument, method.getName() + "." + argument.getIndex());
} else {
throw new IllegalArgumentException(
"Argument config error : the index attribute and type attribute not match :index :" +
argument.getIndex() + ", type:" + argument.getType());
}
} else {
// multiple callbacks in the method
for (int j = 0; j < argtypes.length; j++) {
Class<?> argclazz = argtypes[j];
if (argclazz.getName().equals(argument.getType())) {
AbstractConfig.appendParameters(map, argument, method.getName() + "." + j);
if (argument.getIndex() != -1 && argument.getIndex() != j) {
throw new IllegalArgumentException(
"Argument config error : the index attribute and type attribute not match :index :" +
argument.getIndex() + ", type:" + argument.getType());
}
}
}
}
}
}
}
} else if (argument.getIndex() != -1) {
AbstractConfig.appendParameters(map, argument, method.getName() + "." + argument.getIndex());
} else {
throw new IllegalArgumentException(
"Argument config must set index or type attribute.eg: <dubbo:argument index='0' .../> or <dubbo:argument type=xxx .../>");
}
}
}
} // end of methods for
}
if (ProtocolUtils.isGeneric(generic)) {
map.put(GENERIC_KEY, generic);
map.put(METHODS_KEY, ANY_VALUE);
} else {
String revision = Version.getVersion(interfaceClass, version);
if (revision != null && revision.length() > 0) {
map.put(REVISION_KEY, revision);
}
String[] methods = Wrapper.getWrapper(interfaceClass).getMethodNames();
if (methods.length == 0) {
logger.warn("No method found in service interface " + interfaceClass.getName());
map.put(METHODS_KEY, ANY_VALUE);
} else {
map.put(METHODS_KEY, StringUtils.join(new HashSet<String>(Arrays.asList(methods)), ","));
}
}
/**
* Here the token value configured by the provider is used to assign the value to ServiceConfig#token
*/
if (ConfigUtils.isEmpty(token) && provider != null) {
token = provider.getToken();
}
if (!ConfigUtils.isEmpty(token)) {
if (ConfigUtils.isDefault(token)) {
map.put(TOKEN_KEY, UUID.randomUUID().toString());
} else {
map.put(TOKEN_KEY, token);
}
}
//init serviceMetadata attachments
serviceMetadata.getAttachments().putAll(map);
// export service
String host = findConfigedHosts(protocolConfig, registryURLs, map);
Integer port = findConfigedPorts(protocolConfig, name, map, protocolConfigNum);
URL url = new URL(name, host, port, getContextPath(protocolConfig).map(p -> p + "/" + path).orElse(path), map);
// You can customize Configurator to append extra parameters
if (ExtensionLoader.getExtensionLoader(ConfiguratorFactory.class)
.hasExtension(url.getProtocol())) {
url = ExtensionLoader.getExtensionLoader(ConfiguratorFactory.class)
.getExtension(url.getProtocol()).getConfigurator(url).configure(url);
}
String scope = url.getParameter(SCOPE_KEY);
// don't export when none is configured
if (!SCOPE_NONE.equalsIgnoreCase(scope)) {
// export to local if the config is not remote (export to remote only when config is remote)
if (!SCOPE_REMOTE.equalsIgnoreCase(scope)) {
exportLocal(url);
}
// export to remote if the config is not local (export to local only when config is local)
if (!SCOPE_LOCAL.equalsIgnoreCase(scope)) {
if (CollectionUtils.isNotEmpty(registryURLs)) {
for (URL registryURL : registryURLs) {
if (SERVICE_REGISTRY_PROTOCOL.equals(registryURL.getProtocol())) {
url = url.addParameterIfAbsent(SERVICE_NAME_MAPPING_KEY, "true");
}
//if protocol is only injvm ,not register
if (LOCAL_PROTOCOL.equalsIgnoreCase(url.getProtocol())) {
continue;
}
url = url.addParameterIfAbsent(DYNAMIC_KEY, registryURL.getParameter(DYNAMIC_KEY));
URL monitorUrl = ConfigValidationUtils.loadMonitor(this, registryURL);
if (monitorUrl != null) {
url = url.addParameterAndEncoded(MONITOR_KEY, monitorUrl.toFullString());
}
if (logger.isInfoEnabled()) {
if (url.getParameter(REGISTER_KEY, true)) {
logger.info("Register dubbo service " + interfaceClass.getName() + " url " + url + " to registry " +
registryURL);
} else {
logger.info("Export dubbo service " + interfaceClass.getName() + " to url " + url);
}
}
// For providers, this is used to enable custom proxy to generate invoker
String proxy = url.getParameter(PROXY_KEY);
if (StringUtils.isNotEmpty(proxy)) {
registryURL = registryURL.addParameter(PROXY_KEY, proxy);
}
Invoker<?> invoker = PROXY_FACTORY.getInvoker(ref, (Class) interfaceClass,
registryURL.addParameterAndEncoded(EXPORT_KEY, url.toFullString()));
DelegateProviderMetaDataInvoker wrapperInvoker = new DelegateProviderMetaDataInvoker(invoker, this);
Exporter<?> exporter = PROTOCOL.export(wrapperInvoker);
exporters.add(exporter);
}
} else {
if (logger.isInfoEnabled()) {
logger.info("Export dubbo service " + interfaceClass.getName() + " to url " + url);
}
Invoker<?> invoker = PROXY_FACTORY.getInvoker(ref, (Class) interfaceClass, url);
DelegateProviderMetaDataInvoker wrapperInvoker = new DelegateProviderMetaDataInvoker(invoker, this);
Exporter<?> exporter = PROTOCOL.export(wrapperInvoker);
exporters.add(exporter);
}
MetadataUtils.publishServiceDefinition(url);
}
}
this.urls.add(url);
}
四、dubbo-admin查看并禁用服务
4.1 查询服务列表
4.2 禁用服务
4.2.1 dubbo-admin处理override节点
- 删除disable=true的override服务并创建一个disable=true的override服务
4.2.2 service项目处理provider节点
- service项目真正的监听器是 OverrideListener ， 删除旧的provider节点，增加一个新的disable=true的provider节点
4.2.3 consumer项目刷新invoker列表
- consumer项目真正的监听器是 RegistryDirectory.notify， 刷新本地的invoker列表, 共后续invokerInvocationHandler调用
4.3 启用服务
- 和禁用服务逻辑差不多，此处略过
五、服务调用
