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Implementation for new SMT ExtractTopicFromValueSchema and tests
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121 changes: 121 additions & 0 deletions
121
...ntegration-test/java/io/aiven/kafka/connect/transforms/TopicFromValueSchemaConnector.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,121 @@ | ||
| /* | ||
| * Copyright 2023 Aiven Oy | ||
| * | ||
| * Licensed 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 io.aiven.kafka.connect.transforms; | ||
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| import java.util.Collections; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
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| import org.apache.kafka.common.config.ConfigDef; | ||
| import org.apache.kafka.connect.connector.Task; | ||
| import org.apache.kafka.connect.data.Schema; | ||
| import org.apache.kafka.connect.data.SchemaBuilder; | ||
| import org.apache.kafka.connect.data.Struct; | ||
| import org.apache.kafka.connect.source.SourceConnector; | ||
| import org.apache.kafka.connect.source.SourceRecord; | ||
| import org.apache.kafka.connect.source.SourceTask; | ||
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| /** | ||
| * A connector needed for testing of ExtractTopicFromValueSchema. | ||
| * | ||
| * <p>It just produces a fixed number of struct records with value schema name set. | ||
| */ | ||
| public class TopicFromValueSchemaConnector extends SourceConnector { | ||
| static final int MESSAGES_TO_PRODUCE = 10; | ||
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| private static final Logger log = LoggerFactory.getLogger(TopicFromValueSchemaConnector.class); | ||
| static final String TOPIC = "topic-for-value-schema-connector-test"; | ||
| static final String FIELD = "field-0"; | ||
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| static final String NAME = "com.acme.schema.SchemaNameToTopic"; | ||
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| @Override | ||
| public void start(final Map<String, String> props) { | ||
| } | ||
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| @Override | ||
| public Class<? extends Task> taskClass() { | ||
| return TopicFromValueSchemaConnectorTask.class; | ||
| } | ||
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| @Override | ||
| public List<Map<String, String>> taskConfigs(final int maxTasks) { | ||
| return Collections.singletonList(Collections.emptyMap()); | ||
| } | ||
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| @Override | ||
| public void stop() { | ||
| } | ||
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| @Override | ||
| public ConfigDef config() { | ||
| return new ConfigDef(); | ||
| } | ||
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| @Override | ||
| public String version() { | ||
| return null; | ||
| } | ||
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| public static class TopicFromValueSchemaConnectorTask extends SourceTask { | ||
| private int counter = 0; | ||
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| private final Schema valueSchema = SchemaBuilder.struct() | ||
| .field(FIELD, SchemaBuilder.STRING_SCHEMA) | ||
| .name(NAME) | ||
| .schema(); | ||
| private final Struct value = new Struct(valueSchema).put(FIELD, "Data"); | ||
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| @Override | ||
| public void start(final Map<String, String> props) { | ||
| log.info("Started TopicFromValueSchemaConnector!!!"); | ||
| } | ||
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| @Override | ||
| public List<SourceRecord> poll() throws InterruptedException { | ||
| if (counter >= MESSAGES_TO_PRODUCE) { | ||
| return null; // indicate pause | ||
| } | ||
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| final Map<String, String> sourcePartition = new HashMap<>(); | ||
| sourcePartition.put("partition", "0"); | ||
| final Map<String, String> sourceOffset = new HashMap<>(); | ||
| sourceOffset.put("offset", Integer.toString(counter)); | ||
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| counter += 1; | ||
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| return Collections.singletonList( | ||
| new SourceRecord(sourcePartition, sourceOffset, | ||
| TOPIC, | ||
| valueSchema, value) | ||
| ); | ||
| } | ||
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| @Override | ||
| public void stop() { | ||
| } | ||
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| @Override | ||
| public String version() { | ||
| return null; | ||
| } | ||
| } | ||
| } |
107 changes: 107 additions & 0 deletions
107
src/main/java/io/aiven/kafka/connect/transforms/ExtractTopicFromValueSchema.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| /* | ||
| * Copyright 2023 Aiven Oy | ||
| * | ||
| * Licensed 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 io.aiven.kafka.connect.transforms; | ||
|
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| import java.util.Map; | ||
| import java.util.Optional; | ||
| import java.util.regex.Matcher; | ||
| import java.util.regex.Pattern; | ||
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| import org.apache.kafka.common.config.ConfigDef; | ||
| import org.apache.kafka.connect.connector.ConnectRecord; | ||
| import org.apache.kafka.connect.errors.DataException; | ||
| import org.apache.kafka.connect.transforms.Transformation; | ||
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| public abstract class ExtractTopicFromValueSchema<R extends ConnectRecord<R>> implements Transformation<R> { | ||
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| private static final Logger log = LoggerFactory.getLogger(ExtractTopicFromValueSchema.class); | ||
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| private ExtractTopicFromValueSchemaConfig config; | ||
| private Optional<String> regex; | ||
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| private Optional<Map<String, String>> schemaNameToTopicMap; | ||
| private Pattern pattern; | ||
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| @Override | ||
| public ConfigDef config() { | ||
| return ExtractTopicFromValueSchemaConfig.config(); | ||
| } | ||
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| @Override | ||
| public void configure(final Map<String, ?> configs) { | ||
| this.config = new ExtractTopicFromValueSchemaConfig(configs); | ||
| schemaNameToTopicMap = config.schemaNameToTopicMap(); | ||
| regex = config.regEx(); | ||
| if (regex.isPresent()) { | ||
| pattern = Pattern.compile(regex.get()); | ||
| } | ||
| } | ||
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| @Override | ||
| public R apply(final R record) { | ||
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| if (null == record.valueSchema() || null == record.valueSchema().name()) { | ||
| throw new DataException(" value schema name can't be null: " + record); | ||
| } | ||
| // If no extra configs use record.valueSchema().name() -> newTopic | ||
| if (null == config) { | ||
| return createConnectRecord(record, Optional.ofNullable(record.valueSchema().name()).orElse(record.topic())); | ||
| } | ||
| // First check schema value name -> desired topic name mapping and use that if it is set. | ||
| if (schemaNameToTopicMap.isPresent() && schemaNameToTopicMap.get().containsKey(record.valueSchema().name())) { | ||
| return createConnectRecord(record, schemaNameToTopicMap.get().get(record.valueSchema().name())); | ||
| } | ||
| // Secondly check if regex parsing from schema value name is set and use that. | ||
| final Optional<String> regex = config.regEx(); | ||
| if (regex.isPresent()) { | ||
| final Matcher matcher = pattern.matcher(record.valueSchema().name()); | ||
| if (matcher.find() && matcher.groupCount() == 1) { | ||
| return createConnectRecord(record, matcher.group(1)); | ||
| } | ||
| log.trace("No match with pattern {} from schema name {}", pattern.pattern(), record.valueSchema().name()); | ||
| } | ||
| // If no other configurations are set use value schema name as new topic name. | ||
| return createConnectRecord(record, record.valueSchema().name()); | ||
| } | ||
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| private R createConnectRecord(final R record, final String newTopicName) { | ||
| return record.newRecord( | ||
| newTopicName, | ||
| record.kafkaPartition(), | ||
| record.keySchema(), | ||
| record.key(), | ||
| record.valueSchema(), | ||
| record.value(), | ||
| record.timestamp(), | ||
| record.headers() | ||
| ); | ||
| } | ||
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| @Override | ||
| public void close() { | ||
| } | ||
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| public static class Name<R extends ConnectRecord<R>> extends ExtractTopicFromValueSchema<R> { | ||
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| @Override | ||
| public void close() { | ||
| } | ||
| } | ||
| } |
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