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Master Issue: #6003 ### Motivation This pull request implements the possibility to add builtin functions (in the same way of the build in connectors). The builtin function must include a `pulsar-io.yml` file with the following content ```yml name: <function-name> description: <function-desciption> functionClass: <function-class> ``` e.g. ```yml name: test-function description: test function description functionClass: it.oncode.pulsar.functions.TestFunction ``` it is possible to create a builtin function in the same way of the builtin sinks/sources. Example in scala ```scala val functionConfigBuilder: FunctionConfigBuilder = FunctionConfig.builder() val function = functionConfigBuilder .tenant("public") .namespace("default") .jar("builtin://test-function") .name("test-function-name") .className("it.oncode.pulsar.functions.TestFunction") .inputs(Seq("channel_in").asJava) .output("channel_out") .runtime(FunctionConfig.Runtime.JAVA) .build() Pulsar.admin.functions .createFunction(function, null) ``` Function folder to be specified in the `conf/functions_worker.yml` conf file e.g. `functionsDirectory: ./functions` Function package must be in `*.nar` format like for source/sink connectors ### Modifications I modified the `pulsar-function-utils`, `pulsar-functions-worker` and `pulsar-common` modules on the basis of the built in connectors implementation. Also `Function.proto` has been modified in order to include the `builtin` property #### What this MR does not include - modification of pulsar-admin to fetch the available buildin functions - the related documentation This is a feature that is critical for us, I think we could open an issue for the remaining points and consider to merge this PR.
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pulsar-common/src/main/java/org/apache/pulsar/common/functions/FunctionDefinition.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.common.functions; | ||
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| import lombok.Data; | ||
| import lombok.NoArgsConstructor; | ||
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| /** | ||
| * Basic information about a Pulsar function. | ||
| */ | ||
| @Data | ||
| @NoArgsConstructor | ||
| public class FunctionDefinition { | ||
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| /** | ||
| * The name of the function type. | ||
| */ | ||
| private String name; | ||
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| /** | ||
| * Description to be used for user help. | ||
| */ | ||
| private String description; | ||
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| /** | ||
| * The class name for the function implementation. | ||
| * | ||
| * <p>If not defined, it will be assumed this function cannot act as a data. | ||
| */ | ||
| private String functionClass; | ||
| } |
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...ctions/utils/src/main/java/org/apache/pulsar/functions/utils/functions/FunctionUtils.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.functions.utils.functions; | ||
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| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.nio.file.DirectoryStream; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Path; | ||
| import java.nio.file.Paths; | ||
| import java.util.Collections; | ||
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| import lombok.experimental.UtilityClass; | ||
| import lombok.extern.slf4j.Slf4j; | ||
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| import org.apache.commons.lang3.StringUtils; | ||
| import org.apache.pulsar.common.functions.FunctionDefinition; | ||
| import org.apache.pulsar.common.nar.NarClassLoader; | ||
| import org.apache.pulsar.common.util.ObjectMapperFactory; | ||
| import org.apache.pulsar.functions.utils.Exceptions; | ||
| import org.apache.pulsar.functions.api.Function; | ||
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| @UtilityClass | ||
| @Slf4j | ||
| public class FunctionUtils { | ||
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| private static final String PULSAR_IO_SERVICE_NAME = "pulsar-io.yaml"; | ||
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| /** | ||
| * Extract the Pulsar Function class from a functionctor archive. | ||
| */ | ||
| public static String getFunctionClass(ClassLoader classLoader) throws IOException { | ||
| NarClassLoader ncl = (NarClassLoader) classLoader; | ||
| String configStr = ncl.getServiceDefinition(PULSAR_IO_SERVICE_NAME); | ||
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| FunctionDefinition conf = ObjectMapperFactory.getThreadLocalYaml().readValue(configStr, | ||
| FunctionDefinition.class); | ||
| if (StringUtils.isEmpty(conf.getFunctionClass())) { | ||
| throw new IOException( | ||
| String.format("The '%s' functionctor does not provide a function implementation", conf.getName())); | ||
| } | ||
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| try { | ||
| // Try to load source class and check it implements Function interface | ||
| Class functionClass = ncl.loadClass(conf.getFunctionClass()); | ||
| if (!(Function.class.isAssignableFrom(functionClass))) { | ||
| throw new IOException( | ||
| "Class " + conf.getFunctionClass() + " does not implement interface " + Function.class.getName()); | ||
| } | ||
| } catch (Throwable t) { | ||
| Exceptions.rethrowIOException(t); | ||
| } | ||
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| return conf.getFunctionClass(); | ||
| } | ||
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| public static FunctionDefinition getFunctionDefinition(String narPath) throws IOException { | ||
| try (NarClassLoader ncl = NarClassLoader.getFromArchive(new File(narPath), Collections.emptySet())) { | ||
| String configStr = ncl.getServiceDefinition(PULSAR_IO_SERVICE_NAME); | ||
| return ObjectMapperFactory.getThreadLocalYaml().readValue(configStr, FunctionDefinition.class); | ||
| } | ||
| } | ||
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| public static Functions searchForFunctions(String functionsDirectory) throws IOException { | ||
| Path path = Paths.get(functionsDirectory).toAbsolutePath(); | ||
| log.info("Searching for functions in {}", path); | ||
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| Functions functions = new Functions(); | ||
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| if (!path.toFile().exists()) { | ||
| log.warn("Functions archive directory not found"); | ||
| return functions; | ||
| } | ||
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| try (DirectoryStream<Path> stream = Files.newDirectoryStream(path, "*.nar")) { | ||
| for (Path archive : stream) { | ||
| try { | ||
| FunctionDefinition cntDef = FunctionUtils.getFunctionDefinition(archive.toString()); | ||
| log.info("Found function {} from {}", cntDef, archive); | ||
| log.error(cntDef.getName()); | ||
| log.error(cntDef.getFunctionClass()); | ||
| if (!StringUtils.isEmpty(cntDef.getFunctionClass())) { | ||
| functions.functions.put(cntDef.getName(), archive); | ||
| } | ||
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| functions.functionsDefinitions.add(cntDef); | ||
| } catch (Throwable t) { | ||
| log.warn("Failed to load function from {}", archive, t); | ||
| } | ||
| } | ||
| } | ||
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| Collections.sort(functions.functionsDefinitions, | ||
| (c1, c2) -> String.CASE_INSENSITIVE_ORDER.compare(c1.getName(), c2.getName())); | ||
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| return functions; | ||
| } | ||
| } |
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