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Add ReadOnly state for Proxy (apache#23944)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -22,5 +22,5 @@ | |
| */ | ||
| public enum StateType { | ||
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| OK, CIRCUIT_BREAK, LOCK | ||
| OK, CIRCUIT_BREAK, READ_ONLY, LOCK | ||
| } | ||
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33 changes: 33 additions & 0 deletions
33
...e/src/main/java/org/apache/shardingsphere/proxy/frontend/exception/ReadOnlyException.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.shardingsphere.proxy.frontend.exception; | ||
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| import org.apache.shardingsphere.infra.exception.ConnectionSQLException; | ||
| import org.apache.shardingsphere.infra.util.exception.external.sql.sqlstate.XOpenSQLState; | ||
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| /** | ||
| * Read only exception. | ||
| */ | ||
| public final class ReadOnlyException extends ConnectionSQLException { | ||
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| private static final long serialVersionUID = 6339672680026286798L; | ||
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| public ReadOnlyException() { | ||
| super(XOpenSQLState.GENERAL_WARNING, 11, "The current instance is read-only, Not allowed write traffic."); | ||
| } | ||
| } |
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70 changes: 70 additions & 0 deletions
70
...src/main/java/org/apache/shardingsphere/proxy/frontend/state/impl/ReadOnlyProxyState.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.shardingsphere.proxy.frontend.state.impl; | ||
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| import io.netty.channel.ChannelHandlerContext; | ||
| import org.apache.shardingsphere.db.protocol.packet.DatabasePacket; | ||
| import org.apache.shardingsphere.infra.binder.statement.CommonSQLStatementContext; | ||
| import org.apache.shardingsphere.infra.binder.statement.SQLStatementContext; | ||
| import org.apache.shardingsphere.infra.binder.statement.dml.SelectStatementContext; | ||
| import org.apache.shardingsphere.infra.hint.HintManager; | ||
| import org.apache.shardingsphere.proxy.backend.session.ConnectionSession; | ||
| import org.apache.shardingsphere.proxy.frontend.exception.ReadOnlyException; | ||
| import org.apache.shardingsphere.proxy.frontend.spi.DatabaseProtocolFrontendEngine; | ||
| import org.apache.shardingsphere.proxy.frontend.state.ProxyState; | ||
| import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement; | ||
| import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.SelectStatement; | ||
| import org.apache.shardingsphere.sql.parser.sql.dialect.handler.dml.SelectStatementHandler; | ||
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| import java.util.Optional; | ||
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| /** | ||
| * ReadOnly proxy state. | ||
| */ | ||
| public final class ReadOnlyProxyState implements ProxyState { | ||
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| @Override | ||
| public void execute(final ChannelHandlerContext context, final Object message, final DatabaseProtocolFrontendEngine databaseProtocolFrontendEngine, final ConnectionSession connectionSession) { | ||
| if (isPrimaryRoute(connectionSession.getQueryContext().getSqlStatementContext())) { | ||
| context.writeAndFlush(databaseProtocolFrontendEngine.getCommandExecuteEngine().getErrorPacket(new ReadOnlyException())); | ||
| Optional<DatabasePacket<?>> databasePacket = databaseProtocolFrontendEngine.getCommandExecuteEngine().getOtherPacket(connectionSession); | ||
| databasePacket.ifPresent(context::writeAndFlush); | ||
| } | ||
| } | ||
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| private boolean isPrimaryRoute(final SQLStatementContext<?> sqlStatementContext) { | ||
| return isWriteRouteStatement(sqlStatementContext) || isHintWriteRouteOnly(sqlStatementContext); | ||
| } | ||
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| private boolean isWriteRouteStatement(final SQLStatementContext<?> sqlStatementContext) { | ||
| SQLStatement sqlStatement = sqlStatementContext.getSqlStatement(); | ||
| return containsLockSegment(sqlStatement) || containsLastInsertIdProjection(sqlStatementContext) || !(sqlStatement instanceof SelectStatement); | ||
| } | ||
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| private boolean containsLockSegment(final SQLStatement sqlStatement) { | ||
| return sqlStatement instanceof SelectStatement && SelectStatementHandler.getLockSegment((SelectStatement) sqlStatement).isPresent(); | ||
| } | ||
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| private boolean containsLastInsertIdProjection(final SQLStatementContext<?> sqlStatementContext) { | ||
| return sqlStatementContext instanceof SelectStatementContext && ((SelectStatementContext) sqlStatementContext).getProjectionsContext().isContainsLastInsertIdProjection(); | ||
| } | ||
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| private boolean isHintWriteRouteOnly(final SQLStatementContext<?> sqlStatementContext) { | ||
| return HintManager.isWriteRouteOnly() || (sqlStatementContext instanceof CommonSQLStatementContext && ((CommonSQLStatementContext<?>) sqlStatementContext).isHintWriteRouteOnly()); | ||
| } | ||
| } |