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[HUDI-4418] Add support for ProtoKafkaSource (apache#6135)
- Adds PROTO to Source.SourceType enum. - Handles PROTO type in SourceFormatAdapter by converting to Avro from proto Message objects. Conversion to Row goes Proto -> Avro -> Row currently. - Added ProtoClassBasedSchemaProvider to generate schemas for a proto class that is currently on the classpath. - Added ProtoKafkaSource which parses byte[] into a class that is on the path. - Added ProtoConversionUtil which exposes methods for creating schemas and translating from Proto messages to Avro GenericRecords. - Added KafkaSource which provides a base class for the other Kafka sources to use.
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...ilities/src/main/java/org/apache/hudi/utilities/schema/ProtoClassBasedSchemaProvider.java
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| /* | ||
| * 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.hudi.utilities.schema; | ||
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| import org.apache.hudi.DataSourceUtils; | ||
| import org.apache.hudi.common.config.TypedProperties; | ||
| import org.apache.hudi.common.util.ReflectionUtils; | ||
| import org.apache.hudi.exception.HoodieException; | ||
| import org.apache.hudi.utilities.sources.helpers.ProtoConversionUtil; | ||
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| import org.apache.avro.Schema; | ||
| import org.apache.spark.api.java.JavaSparkContext; | ||
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| import java.util.Collections; | ||
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| /** | ||
| * A schema provider that takes in a class name for a generated protobuf class that is on the classpath. | ||
| */ | ||
| public class ProtoClassBasedSchemaProvider extends SchemaProvider { | ||
| /** | ||
| * Configs supported. | ||
| */ | ||
| public static class Config { | ||
| public static final String PROTO_SCHEMA_CLASS_NAME = "hoodie.deltastreamer.schemaprovider.proto.className"; | ||
| public static final String PROTO_SCHEMA_FLATTEN_WRAPPED_PRIMITIVES = "hoodie.deltastreamer.schemaprovider.proto.flattenWrappers"; | ||
| } | ||
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| private final String schemaString; | ||
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| /** | ||
| * To be lazily inited on executors. | ||
| */ | ||
| private transient Schema schema; | ||
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| public ProtoClassBasedSchemaProvider(TypedProperties props, JavaSparkContext jssc) { | ||
| super(props, jssc); | ||
| DataSourceUtils.checkRequiredProperties(props, Collections.singletonList( | ||
| Config.PROTO_SCHEMA_CLASS_NAME)); | ||
| String className = config.getString(Config.PROTO_SCHEMA_CLASS_NAME); | ||
| boolean flattenWrappedPrimitives = props.getBoolean(ProtoClassBasedSchemaProvider.Config.PROTO_SCHEMA_FLATTEN_WRAPPED_PRIMITIVES, false); | ||
| try { | ||
| schemaString = ProtoConversionUtil.getAvroSchemaForMessageClass(ReflectionUtils.getClass(className), flattenWrappedPrimitives).toString(); | ||
| } catch (Exception e) { | ||
| throw new HoodieException(String.format("Error reading proto source schema for class: %s", className), e); | ||
| } | ||
| } | ||
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| @Override | ||
| public Schema getSourceSchema() { | ||
| if (schema == null) { | ||
| Schema.Parser parser = new Schema.Parser(); | ||
| schema = parser.parse(schemaString); | ||
| } | ||
| return schema; | ||
| } | ||
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| @Override | ||
| public Schema getTargetSchema() { | ||
| return getSourceSchema(); | ||
| } | ||
| } |
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