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Merge pull request #450 from fjtirado/ref-impl
Serverless Workflow reference implementation (skeleton)
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‎api/src/test/java/io/serverlessworkflow/api/FeaturesTest.java

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@@ -44,7 +44,8 @@ public class FeaturesTest {
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"features/switch.yaml",
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"features/try.yaml",
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"features/listen.yaml",
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"features/callFunction.yaml"
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"features/callFunction.yaml",
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"features/callCustomFunction.yaml"
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})
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public void testSpecFeaturesParsing(String workflowLocation) throws IOException {
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Workflow workflow = readWorkflowFromClasspath(workflowLocation);

‎api/src/test/resources/features/callCustomFunction.yaml

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document:
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dsl: 1.0.0-alpha5
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namespace: test
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name: call-example
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version: 0.1.0
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schedule:
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cron: 0 8 * * *
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do:
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- getData:
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call: http
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with:
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method: get
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endpoint: https://api.agify.io?name=meelad
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output:
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as: ".data.reading"
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- filterData:
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for:
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in: ".data.reading"
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each: reading
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do:
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- log:
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call: https://raw.githubusercontent.com/serverlessworkflow/catalog/main/functions/log/1.0.0/function.yaml
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with:
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level: information
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format: "{TIMESTAMP} [{LEVEL}] ({CONTEXT}): {MESSAGE}"
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message: Hello, world!
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timestamp: true

‎impl/pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>io.serverlessworkflow</groupId>
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<artifactId>serverlessworkflow-parent</artifactId>
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<version>7.0.0-SNAPSHOT</version>
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</parent>
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<artifactId>serverlessworkflow-impl</artifactId>
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<properties>
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<version.org.glassfish.jersey>3.1.9</version.org.glassfish.jersey>
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</properties>
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<dependencies>
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<dependency>
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<groupId>io.serverlessworkflow</groupId>
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<artifactId>serverlessworkflow-api</artifactId>
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<version>7.0.0-SNAPSHOT</version>
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</dependency>
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<dependency>
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<groupId>org.glassfish.jersey.core</groupId>
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<artifactId>jersey-client</artifactId>
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<version>${version.org.glassfish.jersey}</version>
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</dependency>
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<dependency>
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<groupId>org.glassfish.jersey.media</groupId>
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<artifactId>jersey-media-json-jackson</artifactId>
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<version>${version.org.glassfish.jersey}</version>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-engine</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-params</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>com.spotify.fmt</groupId>
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<artifactId>fmt-maven-plugin</artifactId>
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<configuration>
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<sourceDirectory>src/main/java</sourceDirectory>
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<testSourceDirectory>src/test/java</testSourceDirectory>
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<verbose>false</verbose>
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<filesNamePattern>.*\.java</filesNamePattern>
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<skip>false</skip>
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<skipSortingImports>false</skipSortingImports>
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<style>google</style>
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</configuration>
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<executions>
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<execution>
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<goals>
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<goal>format</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>

‎impl/src/main/java/io/serverlessworkflow/impl/AbstractTaskExecutor.java

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/*
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* Copyright 2020-Present The Serverless Workflow Specification Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.serverlessworkflow.impl;
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import com.fasterxml.jackson.databind.JsonNode;
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import io.serverlessworkflow.api.types.TaskBase;
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public abstract class AbstractTaskExecutor<T extends TaskBase> implements TaskExecutor<T> {
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protected final T task;
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protected AbstractTaskExecutor(T task) {
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this.task = task;
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}
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@Override
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public JsonNode apply(JsonNode node) {
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// do input filtering
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return internalExecute(node);
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// do output filtering
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}
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protected abstract JsonNode internalExecute(JsonNode node);
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}

‎impl/src/main/java/io/serverlessworkflow/impl/HttpExecutor.java

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/*
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* Copyright 2020-Present The Serverless Workflow Specification Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.serverlessworkflow.impl;
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import com.fasterxml.jackson.core.type.TypeReference;
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import com.fasterxml.jackson.databind.JsonNode;
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import io.serverlessworkflow.api.types.CallHTTP;
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import io.serverlessworkflow.api.types.HTTPArguments;
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import io.serverlessworkflow.api.types.WithHTTPHeaders;
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import io.serverlessworkflow.api.types.WithHTTPQuery;
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import jakarta.ws.rs.client.Client;
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import jakarta.ws.rs.client.ClientBuilder;
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import jakarta.ws.rs.client.Entity;
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import jakarta.ws.rs.client.Invocation.Builder;
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import jakarta.ws.rs.client.WebTarget;
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import jakarta.ws.rs.core.MediaType;
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import java.util.Map;
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import java.util.Map.Entry;
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public class HttpExecutor extends AbstractTaskExecutor<CallHTTP> {
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private static final Client client = ClientBuilder.newClient();
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public HttpExecutor(CallHTTP task) {
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super(task);
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}
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@Override
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protected JsonNode internalExecute(JsonNode node) {
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HTTPArguments httpArgs = task.getWith();
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// missing checks
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String uri =
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httpArgs
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.getEndpoint()
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.getEndpointConfiguration()
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.getUri()
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.getLiteralEndpointURI()
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.getLiteralUriTemplate();
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WebTarget target = client.target(uri);
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WithHTTPQuery query = httpArgs.getQuery();
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if (query != null) {
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for (Entry<String, Object> entry : query.getAdditionalProperties().entrySet()) {
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target = target.queryParam(entry.getKey(), entry.getValue());
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}
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}
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Builder request =
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target
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.resolveTemplates(
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JsonUtils.mapper().convertValue(node, new TypeReference<Map<String, Object>>() {}))
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.request(MediaType.APPLICATION_JSON);
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WithHTTPHeaders headers = httpArgs.getHeaders();
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if (headers != null) {
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headers.getAdditionalProperties().forEach(request::header);
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}
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switch (httpArgs.getMethod().toLowerCase()) {
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case "get":
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default:
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return request.get(JsonNode.class);
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case "post":
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return request.post(Entity.json(httpArgs.getBody()), JsonNode.class);
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}
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}
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}

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