[GitHub] [shardingsphere] RaigorJiang commented on a change in pull request #15088: [DistSQL] Support `create traffic rule` syntax.

[GitBox <gi...@apache.org>]

RaigorJiang commented on a change in pull request #15088:
URL: https://github.com/apache/shardingsphere/pull/15088#discussion_r793199423



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File path: shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/text/distsql/ral/common/create/CreateTrafficRuleHandler.java
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@@ -0,0 +1,131 @@
+/*
+ * 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.shardingsphere.proxy.backend.text.distsql.ral.common.create;
+
+import lombok.RequiredArgsConstructor;
+import org.apache.shardingsphere.distsql.parser.segment.AlgorithmSegment;
+import org.apache.shardingsphere.distsql.parser.segment.TrafficRuleSegment;
+import org.apache.shardingsphere.distsql.parser.statement.rdl.create.CreateTrafficRuleStatement;
+import org.apache.shardingsphere.infra.config.RuleConfiguration;
+import org.apache.shardingsphere.infra.config.algorithm.ShardingSphereAlgorithmConfiguration;
+import org.apache.shardingsphere.infra.distsql.exception.DistSQLException;
+import org.apache.shardingsphere.infra.distsql.exception.rule.DuplicateRuleException;
+import org.apache.shardingsphere.infra.distsql.exception.rule.InvalidAlgorithmConfigurationException;
+import org.apache.shardingsphere.mode.metadata.MetaDataContexts;
+import org.apache.shardingsphere.mode.metadata.persist.MetaDataPersistService;
+import org.apache.shardingsphere.proxy.backend.context.ProxyContext;
+import org.apache.shardingsphere.proxy.backend.response.header.ResponseHeader;
+import org.apache.shardingsphere.proxy.backend.response.header.update.UpdateResponseHeader;
+import org.apache.shardingsphere.proxy.backend.text.TextProtocolBackendHandler;
+import org.apache.shardingsphere.spi.typed.TypedSPIRegistry;
+import org.apache.shardingsphere.traffic.api.config.TrafficRuleConfiguration;
+import org.apache.shardingsphere.traffic.api.config.TrafficStrategyConfiguration;
+import org.apache.shardingsphere.traffic.spi.TrafficAlgorithm;
+import org.apache.shardingsphere.traffic.spi.TrafficLoadBalanceAlgorithm;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Optional;
+import java.util.Properties;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/**
+ * Create traffic rule handler.
+ */
+@RequiredArgsConstructor
+public final class CreateTrafficRuleHandler implements TextProtocolBackendHandler {
+    
+    private final CreateTrafficRuleStatement sqlStatement;
+    
+    @Override
+    public ResponseHeader execute() throws DistSQLException {
+        Optional<TrafficRuleConfiguration> trafficRuleConfiguration = ProxyContext.getInstance().getContextManager().getMetaDataContexts().getGlobalRuleMetaData()
+                .findRuleConfiguration(TrafficRuleConfiguration.class).stream().findAny();
+        check(sqlStatement, trafficRuleConfiguration);
+        TrafficRuleConfiguration newTrafficRuleConfiguration = createTrafficRuleConfiguration(sqlStatement);
+        updateToRepository(newTrafficRuleConfiguration, trafficRuleConfiguration);
+        return new UpdateResponseHeader(sqlStatement);
+    }
+    
+    private void check(final CreateTrafficRuleStatement sqlStatement, final Optional<TrafficRuleConfiguration> trafficRuleConfiguration) throws DistSQLException {
+        if (trafficRuleConfiguration.isPresent()) {
+            Collection<String> currentRuleNames = trafficRuleConfiguration.get().getTrafficStrategies().stream().map(TrafficStrategyConfiguration::getName).collect(Collectors.toSet());
+            Set<String> duplicatedRuleNames = sqlStatement.getSegments().stream().map(TrafficRuleSegment::getName).filter(currentRuleNames::contains).collect(Collectors.toSet());
+            DistSQLException.predictionThrow(duplicatedRuleNames.isEmpty(), new DuplicateRuleException("traffic", duplicatedRuleNames));
+        }
+        Collection<String> invalidAlgorithmNames = getInvalidAlgorithmNames(sqlStatement.getSegments());
+        DistSQLException.predictionThrow(invalidAlgorithmNames.isEmpty(), new InvalidAlgorithmConfigurationException("traffic", invalidAlgorithmNames));
+    }
+    
+    private Collection<String> getInvalidAlgorithmNames(final Collection<TrafficRuleSegment> segments) {
+        Collection<String> result = new ArrayList<>(segments.size());
+        sqlStatement.getSegments().forEach(each -> {
+            if (!TypedSPIRegistry.findRegisteredService(TrafficAlgorithm.class, each.getAlgorithm().getName(), new Properties()).isPresent()) {
+                result.add(each.getAlgorithm().getName());
+            }
+            if (!TypedSPIRegistry.findRegisteredService(TrafficLoadBalanceAlgorithm.class, each.getLoadBalancer().getName(), new Properties()).isPresent()) {
+                result.add(each.getLoadBalancer().getName());
+            }
+        });
+        return result;
+    }
+    
+    private TrafficRuleConfiguration createTrafficRuleConfiguration(final CreateTrafficRuleStatement sqlStatement) {
+        TrafficRuleConfiguration result = new TrafficRuleConfiguration();
+        sqlStatement.getSegments().forEach(each -> setConfigurationData(result, each));
+        return result;
+    }
+    
+    private void setConfigurationData(final TrafficRuleConfiguration result, final TrafficRuleSegment each) {
+        ShardingSphereAlgorithmConfiguration trafficAlgorithm = createAlgorithmConfiguration(each.getAlgorithm());
+        ShardingSphereAlgorithmConfiguration loadBalancer = createAlgorithmConfiguration(each.getLoadBalancer());
+        String trafficAlgorithmName = createAlgorithmName(each.getName(), trafficAlgorithm);
+        String loadBalancerName = createAlgorithmName(each.getName(), loadBalancer);
+        TrafficStrategyConfiguration trafficStrategy = createTrafficStrategy(each, trafficAlgorithmName, loadBalancerName);
+        result.getTrafficStrategies().add(trafficStrategy);
+        result.getTrafficAlgorithms().put(trafficAlgorithmName, trafficAlgorithm);
+        result.getLoadBalancers().put(loadBalancerName, loadBalancer);
+    }
+    
+    private ShardingSphereAlgorithmConfiguration createAlgorithmConfiguration(final AlgorithmSegment segment) {
+        return new ShardingSphereAlgorithmConfiguration(segment.getName(), segment.getProps());
+    }
+    
+    private TrafficStrategyConfiguration createTrafficStrategy(final TrafficRuleSegment trafficRuleSegment, final String trafficAlgorithmName, final String loadBalancerName) {
+        return new TrafficStrategyConfiguration(trafficRuleSegment.getName(), trafficRuleSegment.getLabels(), trafficAlgorithmName, loadBalancerName);
+    }
+    
+    private void updateToRepository(final TrafficRuleConfiguration newTrafficRuleConfiguration, final Optional<TrafficRuleConfiguration> trafficRuleConfiguration) {

Review comment:
       Refer to RuleDefinitionCreateUpdater, use `toBeCreatedRuleConfig` and `currentRuleConfig` to name the params.




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