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Pulsar Functions: allow a Function<GenericObject,?> to access the ori…
…ginal Schema of the Message and use it
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64 changes: 64 additions & 0 deletions
64
...ns/src/main/java/org/apache/pulsar/tests/integration/functions/GenericObjectFunction.java
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|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| /** | ||
| * 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.pulsar.tests.integration.functions; | ||
|
|
||
| import lombok.extern.slf4j.Slf4j; | ||
| import org.apache.pulsar.client.api.Schema; | ||
| import org.apache.pulsar.client.api.schema.GenericObject; | ||
| import org.apache.pulsar.functions.api.Context; | ||
| import org.apache.pulsar.functions.api.Function; | ||
| import org.apache.pulsar.functions.api.Record; | ||
|
|
||
| /** | ||
| * This function processes any message with any schema, | ||
| * and outputs the message with the same schema to another topic. | ||
| */ | ||
| @Slf4j | ||
| public class GenericObjectFunction implements Function<GenericObject, Void> { | ||
|
|
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| @Override | ||
| public Void process(GenericObject genericObject, Context context) throws Exception { | ||
| Record<?> currentRecord = context.getCurrentRecord(); | ||
| log.info("apply to {} {}", genericObject, genericObject.getNativeObject()); | ||
| log.info("record with schema {} {}", currentRecord.getSchema(), currentRecord); | ||
| // do some processing... | ||
| final boolean isStruct; | ||
| switch (currentRecord.getSchema().getSchemaInfo().getType()) { | ||
| case AVRO: | ||
| case JSON: | ||
| case PROTOBUF_NATIVE: | ||
| isStruct = true; | ||
| break; | ||
| default: | ||
| isStruct = false; | ||
| break; | ||
| } | ||
| if (isStruct) { | ||
| // GenericRecord must stay wrapped | ||
| context.newOutputMessage(context.getOutputTopic(), (Schema) currentRecord.getSchema()) | ||
| .value(genericObject).send(); | ||
| } else { | ||
| // primitives and KeyValue must be unwrapped | ||
| context.newOutputMessage(context.getOutputTopic(), (Schema) currentRecord.getSchema()) | ||
| .value(genericObject.getNativeObject()).send(); | ||
| } | ||
| return null; | ||
| } | ||
| } | ||
|
|
159 changes: 159 additions & 0 deletions
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.../src/main/java/org/apache/pulsar/tests/integration/functions/RemoveAvroFieldFunction.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. | ||
| */ | ||
| package org.apache.pulsar.tests.integration.functions; | ||
|
|
||
| import lombok.extern.slf4j.Slf4j; | ||
| import org.apache.avro.generic.GenericData; | ||
| import org.apache.avro.generic.GenericDatumWriter; | ||
| import org.apache.avro.io.BinaryEncoder; | ||
| import org.apache.avro.io.EncoderFactory; | ||
| import org.apache.pulsar.client.api.Schema; | ||
| import org.apache.pulsar.client.api.schema.GenericObject; | ||
| import org.apache.pulsar.client.api.schema.GenericRecord; | ||
| import org.apache.pulsar.client.api.schema.KeyValueSchema; | ||
| import org.apache.pulsar.common.schema.KeyValue; | ||
| import org.apache.pulsar.common.schema.SchemaType; | ||
| import org.apache.pulsar.functions.api.Context; | ||
| import org.apache.pulsar.functions.api.Function; | ||
| import org.apache.pulsar.functions.api.Record; | ||
|
|
||
| import java.io.ByteArrayOutputStream; | ||
| import java.util.stream.Collectors; | ||
|
|
||
| /** | ||
| * This function removes a "field" from a AVRO message | ||
| */ | ||
| @Slf4j | ||
| public class RemoveAvroFieldFunction implements Function<GenericObject, Void> { | ||
|
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| private static final String FIELD_TO_REMOVE = "age"; | ||
|
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| @Override | ||
| public Void process(GenericObject genericObject, Context context) throws Exception { | ||
| Record<?> currentRecord = context.getCurrentRecord(); | ||
| log.info("apply to {} {}", genericObject, genericObject.getNativeObject()); | ||
| log.info("record with schema {} version {} {}", currentRecord.getSchema(), | ||
| currentRecord.getMessage().get().getSchemaVersion(), | ||
| currentRecord); | ||
| Object nativeObject = genericObject.getNativeObject(); | ||
| Schema<?> schema = currentRecord.getSchema(); | ||
|
|
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| Schema outputSchema = schema; | ||
| Object outputObject = genericObject.getNativeObject(); | ||
| boolean someThingDone = false; | ||
| if (schema instanceof KeyValueSchema && nativeObject instanceof KeyValue) { | ||
| KeyValueSchema kvSchema = (KeyValueSchema) schema; | ||
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| Schema keySchema = kvSchema.getKeySchema(); | ||
| Schema valueSchema = kvSchema.getValueSchema(); | ||
| // remove a column "age" from the "valueSchema" | ||
| if (valueSchema.getSchemaInfo().getType() == SchemaType.AVRO) { | ||
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| org.apache.avro.Schema avroSchema = (org.apache.avro.Schema) valueSchema.getNativeSchema().get(); | ||
| if (avroSchema.getField(FIELD_TO_REMOVE) != null) { | ||
| org.apache.avro.Schema.Parser parser = new org.apache.avro.Schema.Parser(); | ||
| org.apache.avro.Schema originalAvroSchema = parser.parse(avroSchema.toString(false)); | ||
| org.apache.avro.Schema modified = org.apache.avro.Schema.createRecord( | ||
| originalAvroSchema.getName(), originalAvroSchema.getDoc(), originalAvroSchema.getNamespace(), originalAvroSchema.isError(), | ||
| originalAvroSchema.getFields(). | ||
| stream() | ||
| .filter(f->!f.name().equals(FIELD_TO_REMOVE)) | ||
| .map(f-> new org.apache.avro.Schema.Field(f.name(), f.schema(), f.doc(), f.defaultVal(), f.order())) | ||
| .collect(Collectors.toList())); | ||
|
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| KeyValue originalObject = (KeyValue) nativeObject; | ||
|
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| GenericRecord value = (GenericRecord) originalObject.getValue(); | ||
| org.apache.avro.generic.GenericRecord genericRecord | ||
| = (org.apache.avro.generic.GenericRecord) value.getNativeObject(); | ||
|
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| org.apache.avro.generic.GenericRecord newRecord = new GenericData.Record(modified); | ||
| for (org.apache.avro.Schema.Field field : modified.getFields()) { | ||
| newRecord.put(field.name(), genericRecord.get(field.name())); | ||
| } | ||
| GenericDatumWriter writer = new GenericDatumWriter(modified); | ||
| ByteArrayOutputStream oo = new ByteArrayOutputStream(); | ||
| BinaryEncoder encoder = EncoderFactory.get().directBinaryEncoder(oo, null); | ||
| writer.write(newRecord, encoder); | ||
| Object newValue = oo.toByteArray(); | ||
|
|
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| Schema newValueSchema = Schema.NATIVE_AVRO(modified); | ||
| outputSchema = Schema.KeyValue(keySchema, newValueSchema, kvSchema.getKeyValueEncodingType()); | ||
| outputObject = new KeyValue(originalObject.getKey(), newValue); | ||
| someThingDone = true; | ||
| } | ||
| } | ||
| } else if (schema.getSchemaInfo().getType() == SchemaType.AVRO) { | ||
| org.apache.avro.Schema avroSchema = (org.apache.avro.Schema) schema.getNativeSchema().get(); | ||
| if (avroSchema.getField(FIELD_TO_REMOVE) != null) { | ||
| org.apache.avro.Schema.Parser parser = new org.apache.avro.Schema.Parser(); | ||
| org.apache.avro.Schema originalAvroSchema = parser.parse(avroSchema.toString(false)); | ||
| org.apache.avro.Schema modified = org.apache.avro.Schema.createRecord( | ||
| originalAvroSchema.getName(), originalAvroSchema.getDoc(), originalAvroSchema.getNamespace(), originalAvroSchema.isError(), | ||
| originalAvroSchema.getFields(). | ||
| stream() | ||
| .filter(f -> !f.name().equals(FIELD_TO_REMOVE)) | ||
| .map(f -> new org.apache.avro.Schema.Field(f.name(), f.schema(), f.doc(), f.defaultVal(), f.order())) | ||
| .collect(Collectors.toList())); | ||
|
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| org.apache.avro.generic.GenericRecord genericRecord | ||
| = (org.apache.avro.generic.GenericRecord) nativeObject; | ||
| org.apache.avro.generic.GenericRecord newRecord = new GenericData.Record(modified); | ||
| for (org.apache.avro.Schema.Field field : modified.getFields()) { | ||
| newRecord.put(field.name(), genericRecord.get(field.name())); | ||
| } | ||
| GenericDatumWriter writer = new GenericDatumWriter(modified); | ||
| ByteArrayOutputStream oo = new ByteArrayOutputStream(); | ||
| BinaryEncoder encoder = EncoderFactory.get().directBinaryEncoder(oo, null); | ||
| writer.write(newRecord, encoder); | ||
|
|
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| Schema newValueSchema = Schema.NATIVE_AVRO(modified); | ||
| outputSchema = newValueSchema; | ||
| outputObject = oo.toByteArray(); | ||
| someThingDone = true; | ||
| } | ||
| } | ||
|
|
||
| if (!someThingDone) { | ||
| // do some processing... | ||
| final boolean isStruct; | ||
| switch (currentRecord.getSchema().getSchemaInfo().getType()) { | ||
| case AVRO: | ||
| case JSON: | ||
| case PROTOBUF_NATIVE: | ||
| isStruct = true; | ||
| break; | ||
| default: | ||
| isStruct = false; | ||
| break; | ||
| } | ||
| if (isStruct) { | ||
| // GenericRecord must stay wrapped | ||
| outputObject = currentRecord.getValue(); | ||
| } else { | ||
| // primitives and KeyValue must be unwrapped | ||
| outputObject = nativeObject; | ||
| } | ||
| } | ||
| log.info("output {} schema {}", outputObject, outputSchema); | ||
| context.newOutputMessage(context.getOutputTopic(), outputSchema) | ||
| .value(outputObject).send(); | ||
| return null; | ||
| } | ||
| } |
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