| /* |
| * 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.cassandra.cql3.statements; |
| |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import java.util.List; |
| |
| import org.apache.cassandra.auth.*; |
| import org.apache.cassandra.config.DatabaseDescriptor; |
| import org.apache.cassandra.config.Schema; |
| import org.apache.cassandra.cql3.CQL3Type; |
| import org.apache.cassandra.cql3.ColumnIdentifier; |
| import org.apache.cassandra.cql3.functions.*; |
| import org.apache.cassandra.db.marshal.AbstractType; |
| import org.apache.cassandra.exceptions.*; |
| import org.apache.cassandra.schema.Functions; |
| import org.apache.cassandra.service.ClientState; |
| import org.apache.cassandra.service.MigrationManager; |
| import org.apache.cassandra.service.QueryState; |
| import org.apache.cassandra.thrift.ThriftValidation; |
| import org.apache.cassandra.transport.Event; |
| |
| /** |
| * A {@code CREATE FUNCTION} statement parsed from a CQL query. |
| */ |
| public final class CreateFunctionStatement extends SchemaAlteringStatement |
| { |
| private final boolean orReplace; |
| private final boolean ifNotExists; |
| private FunctionName functionName; |
| private final String language; |
| private final String body; |
| |
| private final List<ColumnIdentifier> argNames; |
| private final List<CQL3Type.Raw> argRawTypes; |
| private final CQL3Type.Raw rawReturnType; |
| private final boolean calledOnNullInput; |
| |
| private List<AbstractType<?>> argTypes; |
| private AbstractType<?> returnType; |
| |
| public CreateFunctionStatement(FunctionName functionName, |
| String language, |
| String body, |
| List<ColumnIdentifier> argNames, |
| List<CQL3Type.Raw> argRawTypes, |
| CQL3Type.Raw rawReturnType, |
| boolean calledOnNullInput, |
| boolean orReplace, |
| boolean ifNotExists) |
| { |
| this.functionName = functionName; |
| this.language = language; |
| this.body = body; |
| this.argNames = argNames; |
| this.argRawTypes = argRawTypes; |
| this.rawReturnType = rawReturnType; |
| this.calledOnNullInput = calledOnNullInput; |
| this.orReplace = orReplace; |
| this.ifNotExists = ifNotExists; |
| } |
| |
| public Prepared prepare(ClientState clientState) throws InvalidRequestException |
| { |
| if (new HashSet<>(argNames).size() != argNames.size()) |
| throw new InvalidRequestException(String.format("duplicate argument names for given function %s with argument names %s", |
| functionName, argNames)); |
| |
| argTypes = new ArrayList<>(argRawTypes.size()); |
| for (CQL3Type.Raw rawType : argRawTypes) |
| argTypes.add(prepareType("arguments", rawType)); |
| |
| returnType = prepareType("return type", rawReturnType); |
| return super.prepare(clientState); |
| } |
| |
| public void prepareKeyspace(ClientState state) throws InvalidRequestException |
| { |
| if (!functionName.hasKeyspace() && state.getRawKeyspace() != null) |
| functionName = new FunctionName(state.getRawKeyspace(), functionName.name); |
| |
| if (!functionName.hasKeyspace()) |
| throw new InvalidRequestException("Functions must be fully qualified with a keyspace name if a keyspace is not set for the session"); |
| |
| ThriftValidation.validateKeyspaceNotSystem(functionName.keyspace); |
| } |
| |
| protected void grantPermissionsToCreator(QueryState state) |
| { |
| try |
| { |
| IResource resource = FunctionResource.function(functionName.keyspace, functionName.name, argTypes); |
| DatabaseDescriptor.getAuthorizer().grant(AuthenticatedUser.SYSTEM_USER, |
| resource.applicablePermissions(), |
| resource, |
| RoleResource.role(state.getClientState().getUser().getName())); |
| } |
| catch (RequestExecutionException e) |
| { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| public void checkAccess(ClientState state) throws UnauthorizedException, InvalidRequestException |
| { |
| if (Schema.instance.findFunction(functionName, argTypes).isPresent() && orReplace) |
| state.ensureHasPermission(Permission.ALTER, FunctionResource.function(functionName.keyspace, |
| functionName.name, |
| argTypes)); |
| else |
| state.ensureHasPermission(Permission.CREATE, FunctionResource.keyspace(functionName.keyspace)); |
| } |
| |
| public void validate(ClientState state) throws InvalidRequestException |
| { |
| UDFunction.assertUdfsEnabled(language); |
| |
| if (ifNotExists && orReplace) |
| throw new InvalidRequestException("Cannot use both 'OR REPLACE' and 'IF NOT EXISTS' directives"); |
| |
| if (Schema.instance.getKSMetaData(functionName.keyspace) == null) |
| throw new InvalidRequestException(String.format("Cannot add function '%s' to non existing keyspace '%s'.", functionName.name, functionName.keyspace)); |
| } |
| |
| public Event.SchemaChange announceMigration(QueryState queryState, boolean isLocalOnly) throws RequestValidationException |
| { |
| Function old = Schema.instance.findFunction(functionName, argTypes).orElse(null); |
| boolean replaced = old != null; |
| if (replaced) |
| { |
| if (ifNotExists) |
| return null; |
| if (!orReplace) |
| throw new InvalidRequestException(String.format("Function %s already exists", old)); |
| if (!(old instanceof ScalarFunction)) |
| throw new InvalidRequestException(String.format("Function %s can only replace a function", old)); |
| if (calledOnNullInput != ((ScalarFunction) old).isCalledOnNullInput()) |
| throw new InvalidRequestException(String.format("Function %s can only be replaced with %s", old, |
| calledOnNullInput ? "CALLED ON NULL INPUT" : "RETURNS NULL ON NULL INPUT")); |
| |
| if (!Functions.typesMatch(old.returnType(), returnType)) |
| throw new InvalidRequestException(String.format("Cannot replace function %s, the new return type %s is not compatible with the return type %s of existing function", |
| functionName, returnType.asCQL3Type(), old.returnType().asCQL3Type())); |
| } |
| |
| UDFunction udFunction = UDFunction.create(functionName, argNames, argTypes, returnType, calledOnNullInput, language, body); |
| |
| MigrationManager.announceNewFunction(udFunction, isLocalOnly); |
| |
| return new Event.SchemaChange(replaced ? Event.SchemaChange.Change.UPDATED : Event.SchemaChange.Change.CREATED, |
| Event.SchemaChange.Target.FUNCTION, |
| udFunction.name().keyspace, udFunction.name().name, AbstractType.asCQLTypeStringList(udFunction.argTypes())); |
| } |
| |
| private AbstractType<?> prepareType(String typeName, CQL3Type.Raw rawType) |
| { |
| if (rawType.isFrozen()) |
| throw new InvalidRequestException(String.format("The function %s should not be frozen; remove the frozen<> modifier", typeName)); |
| |
| // UDT are not supported non frozen but we do not allow the frozen keyword for argument. So for the moment we |
| // freeze them here |
| if (!rawType.canBeNonFrozen()) |
| rawType.freeze(); |
| |
| AbstractType<?> type = rawType.prepare(functionName.keyspace).getType(); |
| return type; |
| } |
| } |