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Support extract-headers kafka message transform (#1177)
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41 changes: 41 additions & 0 deletions
41
.../main/java/io/aklivity/zilla/runtime/binding/kafka/config/KafkaTopicTransformsConfig.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| /* | ||
| * Copyright 2021-2023 Aklivity Inc. | ||
| * | ||
| * Aklivity 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 io.aklivity.zilla.runtime.binding.kafka.config; | ||
|
|
||
| import java.util.List; | ||
| import java.util.function.Function; | ||
|
|
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| public class KafkaTopicTransformsConfig | ||
| { | ||
| public final List<KafkaTopicHeaderType> extractHeaders; | ||
|
|
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| public static KafkaTopicTransformsConfigBuilder<KafkaTopicTransformsConfig> builder() | ||
| { | ||
| return new KafkaTopicTransformsConfigBuilder<>(KafkaTopicTransformsConfig.class::cast); | ||
| } | ||
|
|
||
| public static <T> KafkaTopicTransformsConfigBuilder<T> builder( | ||
| Function<KafkaTopicTransformsConfig, T> mapper) | ||
| { | ||
| return new KafkaTopicTransformsConfigBuilder<>(mapper); | ||
| } | ||
|
|
||
| KafkaTopicTransformsConfig( | ||
| List<KafkaTopicHeaderType> extractHeaders) | ||
| { | ||
| this.extractHeaders = extractHeaders; | ||
| } | ||
| } |
96 changes: 96 additions & 0 deletions
96
...ava/io/aklivity/zilla/runtime/binding/kafka/config/KafkaTopicTransformsConfigBuilder.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| /* | ||
| * Copyright 2021-2023 Aklivity Inc. | ||
| * | ||
| * Aklivity 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 io.aklivity.zilla.runtime.binding.kafka.config; | ||
|
|
||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.function.Function; | ||
| import java.util.regex.Matcher; | ||
| import java.util.regex.Pattern; | ||
|
|
||
| import io.aklivity.zilla.runtime.engine.config.ConfigBuilder; | ||
|
|
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| public final class KafkaTopicTransformsConfigBuilder<T> extends ConfigBuilder<T, KafkaTopicTransformsConfigBuilder<T>> | ||
| { | ||
| private static final String PATH = "^\\$\\{message\\.value\\.([A-Za-z_][A-Za-z0-9_]*)\\}$"; | ||
| private static final Pattern PATH_PATTERN = Pattern.compile(PATH); | ||
| private static final String INTERNAL_VALUE = "$.%s"; | ||
| private static final String INTERNAL_PATH = "^\\$\\..*$"; | ||
| private static final Pattern INTERNAL_PATH_PATTERN = Pattern.compile(INTERNAL_PATH); | ||
|
|
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| private final Matcher matcher; | ||
| private final Matcher internalMatcher; | ||
| private final Function<KafkaTopicTransformsConfig, T> mapper; | ||
| private List<KafkaTopicHeaderType> extractHeaders; | ||
|
|
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| KafkaTopicTransformsConfigBuilder( | ||
| Function<KafkaTopicTransformsConfig, T> mapper) | ||
| { | ||
| this.mapper = mapper; | ||
| this.extractHeaders = new ArrayList<>(); | ||
| this.matcher = PATH_PATTERN.matcher(""); | ||
| this.internalMatcher = INTERNAL_PATH_PATTERN.matcher(""); | ||
| } | ||
|
|
||
| @Override | ||
| @SuppressWarnings("unchecked") | ||
| protected Class<KafkaTopicTransformsConfigBuilder<T>> thisType() | ||
| { | ||
| return (Class<KafkaTopicTransformsConfigBuilder<T>>) getClass(); | ||
| } | ||
|
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| public KafkaTopicTransformsConfigBuilder<T> extractHeaders( | ||
| List<KafkaTopicHeaderType> extractHeaders) | ||
| { | ||
| if (extractHeaders != null) | ||
| { | ||
| extractHeaders.forEach(this::extractHeader); | ||
| } | ||
| return this; | ||
| } | ||
|
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| public KafkaTopicTransformsConfigBuilder<T> extractHeader( | ||
| KafkaTopicHeaderType header) | ||
| { | ||
| return extractHeader(header.name, header.path); | ||
| } | ||
|
|
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| public KafkaTopicTransformsConfigBuilder<T> extractHeader( | ||
| String name, | ||
| String path) | ||
| { | ||
| if (this.extractHeaders == null) | ||
| { | ||
| this.extractHeaders = new ArrayList<>(); | ||
| } | ||
| if (matcher.reset(path).matches()) | ||
| { | ||
| this.extractHeaders.add(new KafkaTopicHeaderType(name, | ||
| String.format(INTERNAL_VALUE, matcher.group(1)))); | ||
| } | ||
| else if (internalMatcher.reset(path).matches()) | ||
| { | ||
| this.extractHeaders.add(new KafkaTopicHeaderType(name, path)); | ||
| } | ||
| return this; | ||
| } | ||
|
|
||
| @Override | ||
| public T build() | ||
| { | ||
| return mapper.apply(new KafkaTopicTransformsConfig(extractHeaders)); | ||
| } | ||
| } |
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