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| 1 | +/* |
| 2 | + * Copyright 2020-Present The Serverless Workflow Specification Authors |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | +package io.serverlessworkflow.impl.executors.a2a; |
| 17 | + |
| 18 | +import io.serverlessworkflow.impl.WorkflowContext; |
| 19 | +import io.serverlessworkflow.impl.WorkflowError; |
| 20 | +import io.serverlessworkflow.impl.WorkflowModel; |
| 21 | +import io.serverlessworkflow.impl.WorkflowModelFactory; |
| 22 | +import io.serverlessworkflow.impl.WorkflowPosition; |
| 23 | +import io.serverlessworkflow.types.Errors; |
| 24 | +import java.time.Instant; |
| 25 | +import java.util.Map; |
| 26 | +import java.util.Optional; |
| 27 | +import java.util.function.Supplier; |
| 28 | +import org.a2aproject.sdk.spec.Message; |
| 29 | +import org.a2aproject.sdk.spec.Task; |
| 30 | +import org.slf4j.Logger; |
| 31 | +import org.slf4j.LoggerFactory; |
| 32 | + |
| 33 | +class A2AUtils { |
| 34 | + |
| 35 | + static final String TASK_ID = "taskId"; |
| 36 | + |
| 37 | + private static final Logger logger = LoggerFactory.getLogger(A2AUtils.class); |
| 38 | + |
| 39 | + static <T> T param(Map<String, Object> map, String key, Class<T> instanceClass) { |
| 40 | + Object obj = map.get(key); |
| 41 | + return isInstanceOrThrow( |
| 42 | + obj, |
| 43 | + instanceClass, |
| 44 | + () -> "value " + obj + " for key " + key + " is not an instance of type " + instanceClass); |
| 45 | + } |
| 46 | + |
| 47 | + static <T> T optionalParam( |
| 48 | + Map<String, Object> map, String key, Class<T> instanceClass, Supplier<T> defaultValue) { |
| 49 | + return isInstanceOrDefault(map.get(key), instanceClass, defaultValue); |
| 50 | + } |
| 51 | + |
| 52 | + static <T extends Enum<T>> T enumParam( |
| 53 | + Map<String, Object> map, String key, Class<T> instanceClass, T defaultValue) { |
| 54 | + Object obj = map.get(key); |
| 55 | + |
| 56 | + if (instanceClass.isInstance(obj)) { |
| 57 | + return instanceClass.cast(obj); |
| 58 | + } else if (String.class.isInstance(obj)) { |
| 59 | + return Enum.valueOf(instanceClass, String.class.cast(obj)); |
| 60 | + } else { |
| 61 | + return defaultValue; |
| 62 | + } |
| 63 | + } |
| 64 | + |
| 65 | + static <T> T optionalParam(Map<String, Object> map, String key, Class<T> instanceClass) { |
| 66 | + return isInstanceOrDefault(map.get(key), instanceClass, () -> null); |
| 67 | + } |
| 68 | + |
| 69 | + static <T> T isInstanceOrThrow(Object obj, Class<T> instanceClass, Supplier<String> message) { |
| 70 | + return isInstance(obj, instanceClass) |
| 71 | + .orElseThrow(() -> new IllegalArgumentException(message.get())); |
| 72 | + } |
| 73 | + |
| 74 | + static <T> T isInstanceOrDefault(Object obj, Class<T> instanceClass, Supplier<T> defaultValue) { |
| 75 | + return isInstance(obj, instanceClass) |
| 76 | + .orElseGet( |
| 77 | + () -> { |
| 78 | + if (obj != null) { |
| 79 | + logger.warn( |
| 80 | + "Object " |
| 81 | + + obj |
| 82 | + + " is expected to be of class" |
| 83 | + + instanceClass |
| 84 | + + " but it is of class " |
| 85 | + + obj.getClass() |
| 86 | + + " Using provided default"); |
| 87 | + } |
| 88 | + return defaultValue.get(); |
| 89 | + }); |
| 90 | + } |
| 91 | + |
| 92 | + private static <T> Optional<T> isInstance(Object obj, Class<T> instanceClass) { |
| 93 | + if (instanceClass.isInstance(obj)) { |
| 94 | + return Optional.of(instanceClass.cast(obj)); |
| 95 | + } else if (Instant.class.isAssignableFrom(instanceClass) && String.class.isInstance(obj)) { |
| 96 | + return Optional.of(instanceClass.cast(Instant.parse(String.class.cast(obj)))); |
| 97 | + } else { |
| 98 | + return Optional.empty(); |
| 99 | + } |
| 100 | + } |
| 101 | + |
| 102 | + static WorkflowModel fromTask(WorkflowModelFactory factory, Task task) { |
| 103 | + return factory.fromOther(task); |
| 104 | + } |
| 105 | + |
| 106 | + static WorkflowModel fromTask(WorkflowContext context, Task task) { |
| 107 | + return fromTask(context.definition().application().modelFactory(), task); |
| 108 | + } |
| 109 | + |
| 110 | + static WorkflowModel fromMessage(WorkflowModelFactory factory, Message message) { |
| 111 | + return factory.fromOther(message); |
| 112 | + } |
| 113 | + |
| 114 | + static WorkflowError.Builder workflowError(WorkflowPosition position) { |
| 115 | + return WorkflowError.error(Errors.RUNTIME.toString(), Errors.RUNTIME.status()) |
| 116 | + .instance(position.jsonPointer().toString()); |
| 117 | + } |
| 118 | + |
| 119 | + private A2AUtils() {} |
| 120 | +} |
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