statefun-flink/statefun-flink-core/src/test/java/org/apache/flink/statefun/flink/core/protorouter/AddressResolverTest.java

/*
 * 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.flink.statefun.flink.core.protorouter;

import static org.apache.flink.statefun.flink.core.protorouter.AddressResolver.fromAddressTemplate;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;

import com.google.protobuf.DynamicMessage;
import com.google.protobuf.InvalidProtocolBufferException;
import com.google.protobuf.Message;
import org.apache.flink.statefun.flink.core.protorouter.generated.TestProtos.SimpleMessage;
import org.apache.flink.statefun.sdk.Address;
import org.apache.flink.statefun.sdk.FunctionType;
import org.junit.Test;

public class AddressResolverTest {

  @Test
  public void exampleUsage() {
    Message originalMessage = SimpleMessage.newBuilder().setName("bob").build();
    DynamicMessage message = dynamic(originalMessage);

    AddressResolver addressResolver =
        fromAddressTemplate(
            originalMessage.getDescriptorForType(), "org.apache.flink/python-function/{{$.name}}");

    assertThat(
        addressResolver.evaluate(message),
        is(address("org.apache.flink", "python-function", "bob")));
  }

  @Test
  public void multipleReplacements() {
    Message originalMessage = SimpleMessage.newBuilder().setName("bob").build();
    DynamicMessage message = dynamic(originalMessage);

    AddressResolver addressResolver =
        fromAddressTemplate(
            originalMessage.getDescriptorForType(), "com.{{$.name}}/python-{{$.name}}/{{$.name}}");

    assertThat(addressResolver.evaluate(message), is(address("com.bob", "python-bob", "bob")));
  }

  @Test
  public void namespaceWithMultipleSlashes() {
    Message originalMessage = SimpleMessage.newBuilder().setName("cat").build();
    DynamicMessage message = dynamic(originalMessage);

    AddressResolver addressResolver =
        fromAddressTemplate(
            originalMessage.getDescriptorForType(), "a/b/c/apache/python-function/{{$.name}}");

    assertThat(
        addressResolver.evaluate(message), is(address("a/b/c/apache", "python-function", "cat")));
  }

  private static Address address(String ns, String type, String id) {
    return new Address(new FunctionType(ns, type), id);
  }

  private static DynamicMessage dynamic(Message message) {
    try {
      return DynamicMessage.parseFrom(message.getDescriptorForType(), message.toByteString());
    } catch (InvalidProtocolBufferException e) {
      throw new AssertionError(e);
    }
  }
}