liubao68 commented on code in PR #4564: URL: https://github.com/apache/servicecomb-java-chassis/pull/4564#discussion_r1817518373
########## service-registry/registry-etcd/src/main/java/org/apache/servicecomb/registry/etcd/EtcdDiscovery.java: ########## @@ -0,0 +1,207 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.servicecomb.registry.etcd; + +import java.nio.charset.Charset; +import java.nio.charset.StandardCharsets; +import java.util.ArrayList; +import java.util.List; +import java.util.Map; +import java.util.concurrent.CompletableFuture; +import java.util.function.Function; +import java.util.stream.Collectors; + +import org.apache.commons.lang3.StringUtils; +import org.apache.servicecomb.config.BootStrapProperties; +import org.apache.servicecomb.foundation.common.utils.JsonUtils; +import org.apache.servicecomb.registry.api.Discovery; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; +import org.springframework.beans.factory.annotation.Autowired; +import org.springframework.core.env.Environment; + +import com.google.common.collect.Lists; + +import io.etcd.jetcd.ByteSequence; +import io.etcd.jetcd.Client; +import io.etcd.jetcd.KeyValue; +import io.etcd.jetcd.Watch; +import io.etcd.jetcd.kv.GetResponse; +import io.etcd.jetcd.options.GetOption; +import io.etcd.jetcd.options.WatchOption; + +public class EtcdDiscovery implements Discovery<EtcdDiscoveryInstance> { + + private Environment environment; + + private String basePath; + + private EtcdRegistryProperties etcdRegistryProperties; + + private Client client; + + private InstanceChangedListener<EtcdDiscoveryInstance> instanceChangedListener; + + private static final Logger LOGGER = LoggerFactory.getLogger(EtcdDiscovery.class); + + @Autowired + @SuppressWarnings("unused") + public void setEnvironment(Environment environment) { + this.environment = environment; + } + + @Autowired + @SuppressWarnings("unused") + public void setEtcdRegistryProperties(EtcdRegistryProperties etcdRegistryProperties) { + this.etcdRegistryProperties = etcdRegistryProperties; + } + + @Override + public String name() { + return EtcdConst.ETCD_REGISTRY_NAME; + } + + @Override + public boolean enabled(String application, String serviceName) { + return environment.getProperty(String.format(EtcdConst.ETCD_DISCOVERY_ENABLED, application, serviceName), + boolean.class, true); + } + + @Override + public List<EtcdDiscoveryInstance> findServiceInstances(String application, String serviceName) { + + String prefixPath = basePath + "/" + application + "/" + serviceName; + SingletonManager.getInstance().computeIfAbsent(prefixPath, serName -> { + Watch watchClient = client.getWatchClient(); + try { + ByteSequence prefixByteSeq = ByteSequence.from(prefixPath, Charset.defaultCharset()); + watchClient.watch( + prefixByteSeq, + WatchOption.builder().withPrefix(prefixByteSeq).build(), + resp -> { + Map<String, EtcdDiscoveryInstance> instanceMap = SingletonManager.getInstance() + .get("instance:" + prefixPath); + resp.getEvents().forEach(event -> { + String key = event.getKeyValue().getKey().toString(Charset.defaultCharset()); + switch (event.getEventType()) { + case PUT -> { + EtcdDiscoveryInstance newInstance = getEtcdDiscoveryInstance(event.getKeyValue()); + instanceMap.put(key, newInstance); + } + case DELETE -> instanceMap.remove(key); + default -> LOGGER.error("unkonw event"); + } + }); + List<EtcdDiscoveryInstance> discoveryInstanceList = new ArrayList<>(instanceMap.values()); + instanceChangedListener.onInstanceChanged(name(), application, serviceName, discoveryInstanceList); + } + ); + } catch (Exception e) { + LOGGER.error("Failed to add watch", e); + } + return watchClient; + }); + + List<KeyValue> endpointKv = getValuesByPrefix(prefixPath); + List<EtcdDiscoveryInstance> etcdDiscoveryInstances = convertServiceInstanceList(endpointKv); + SingletonManager.getInstance().computeIfAbsent("instance:" + prefixPath, v -> etcdDiscoveryInstances.stream() + .collect( + Collectors.toConcurrentMap(instance -> prefixPath + "/" + instance.getInstanceId(), Function.identity()))); + return etcdDiscoveryInstances; + } + + public List<KeyValue> getValuesByPrefix(String prefix) { + + CompletableFuture<GetResponse> getFuture = client.getKVClient() + .get(ByteSequence.from(prefix, StandardCharsets.UTF_8), + GetOption.builder().withPrefix(ByteSequence.from(prefix, StandardCharsets.UTF_8)).build()); + GetResponse response = MuteExceptionUtil.builder().withLog("get kv by prefix error") + .executeCompletableFuture(getFuture); + return response.getKvs(); + } + + private List<EtcdDiscoveryInstance> convertServiceInstanceList(List<KeyValue> keyValueList) { + + List<EtcdDiscoveryInstance> list = Lists.newArrayListWithExpectedSize(keyValueList.size()); + for (KeyValue keyValue : keyValueList) { + EtcdDiscoveryInstance etcdDiscoveryInstance = getEtcdDiscoveryInstance(keyValue); + list.add(etcdDiscoveryInstance); + } + return list; + } + + private static EtcdDiscoveryInstance getEtcdDiscoveryInstance(KeyValue keyValue) { + String valueJson = new String(keyValue.getValue().getBytes(), Charset.defaultCharset()); + + EtcdInstance etcdInstance = MuteExceptionUtil.builder() + .withLog("convert json value to obj from etcd failure, {}", valueJson) + .executeFunctionWithDoubleParam(JsonUtils::readValue, valueJson.getBytes(StandardCharsets.UTF_8), + EtcdInstance.class); + EtcdDiscoveryInstance etcdDiscoveryInstance = new EtcdDiscoveryInstance(etcdInstance); + return etcdDiscoveryInstance; + } + + @Override + public List<String> findServices(String application) { + + String prefixPath = basePath + "/" + application; + List<KeyValue> endpointKv = getValuesByPrefix(prefixPath); + return endpointKv.stream().map(kv -> kv.getKey().toString(StandardCharsets.UTF_8)) // 转换 ByteSequence 为 String Review Comment: Use English if possible. -- This is an automated message from the Apache Git Service. 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