Adding Spring Cloud Stream Version To Message Headers For Easier Debugging Of Issues.

Fix checkstyles
Resolves #3027

Author: omercelikceng

.gitignore

@@ -25,6 +25,7 @@ dump.rdb
 .apt_generated
 artifacts
 **/dependency-reduced-pom.xml
+core/spring-cloud-stream/src/main/java/org/springframework/cloud/stream/utils/GeneratedBuildProperties.java
 
 node
 node_modules

core/spring-cloud-stream-integration-tests/src/test/java/org/springframework/cloud/stream/function/HeaderTests.java

@@ -16,7 +16,10 @@
 
 package org.springframework.cloud.stream.function;
 
+import java.nio.charset.StandardCharsets;
+import java.util.Collections;
 import java.util.Locale;
+import java.util.Map;
 import java.util.function.Function;
 
 import org.junit.jupiter.api.BeforeAll;
@@ -26,9 +29,14 @@
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.builder.SpringApplicationBuilder;
 import org.springframework.cloud.function.context.message.MessageUtils;
+import org.springframework.cloud.function.json.JsonMapper;
+import org.springframework.cloud.stream.binder.BinderHeaders;
+import org.springframework.cloud.stream.binder.test.EnableTestBinder;
 import org.springframework.cloud.stream.binder.test.InputDestination;
 import org.springframework.cloud.stream.binder.test.OutputDestination;
 import org.springframework.cloud.stream.binder.test.TestChannelBinderConfiguration;
+import org.springframework.cloud.stream.utils.BuildInformationProvider;
+import org.springframework.context.ApplicationContext;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -43,7 +51,6 @@
 /**
  * @author Omer Celik
  */
-
 public class HeaderTests {
 
 	@BeforeAll
@@ -63,10 +70,8 @@ void checkWithEmptyPojo() {
 
 			OutputDestination outputDestination = context.getBean(OutputDestination.class);
 			Message<byte[]> messageReceived = outputDestination.receive(1000, "emptyConfigurationDestination");
-			MessageHeaders headers = messageReceived.getHeaders();
-			assertThat(headers).isNotNull();
-			assertThat(headers.get(MessageUtils.TARGET_PROTOCOL)).isEqualTo("kafka");
-			assertThat(headers.get(MessageHeaders.CONTENT_TYPE)).isEqualTo("application/json");
+
+			checkCommonHeaders(messageReceived.getHeaders());
 		}
 	}
 
@@ -75,20 +80,20 @@ void checkIfHeaderProvidedInData() {
 		try (ConfigurableApplicationContext context = new SpringApplicationBuilder(
 			TestChannelBinderConfiguration.getCompleteConfiguration(EmptyConfiguration.class))
 			.web(WebApplicationType.NONE).run("--spring.jmx.enabled=false")) {
+
 			StreamBridge streamBridge = context.getBean(StreamBridge.class);
 			String jsonPayload = "{\"name\":\"Omer\"}";
 			streamBridge.send("myBinding-out-0",
 				MessageBuilder.withPayload(jsonPayload.getBytes())
 					.setHeader("anyHeader", "anyValue")
 					.build(),
 				MimeTypeUtils.APPLICATION_JSON);
+
 			OutputDestination output = context.getBean(OutputDestination.class);
 			Message<byte[]> result = output.receive(1000, "myBinding-out-0");
-			MessageHeaders headers = result.getHeaders();
-			assertThat(headers).isNotNull();
-			assertThat(headers.get(MessageUtils.TARGET_PROTOCOL)).isEqualTo("kafka");
-			assertThat(headers.get(MessageHeaders.CONTENT_TYPE)).isEqualTo("application/json");
-			assertThat(headers.get("anyHeader")).isEqualTo("anyValue");
+
+			checkCommonHeaders(result.getHeaders());
+			assertThat(result.getHeaders().get("anyHeader")).isEqualTo("anyValue");
 		}
 	}
 
@@ -99,16 +104,35 @@ void checkGenericMessageSent() {
 			.web(WebApplicationType.NONE)
 			.run("--spring.jmx.enabled=false",
 				"--spring.cloud.function.definition=uppercase")) {
+
 			String jsonPayload = "{\"surname\":\"Celik\"}";
 			InputDestination input = context.getBean(InputDestination.class);
 			input.send(new GenericMessage<>(jsonPayload.getBytes()), "uppercase-in-0");
+
 			OutputDestination output = context.getBean(OutputDestination.class);
+			Message<byte[]> result = output.receive(1000, "uppercase-out-0");
+
+			checkCommonHeaders(result.getHeaders());
+		}
+	}
 
+	@Test
+	void checkGenericMessageSentUsingStreamBridge() {
+		try (ConfigurableApplicationContext context = new SpringApplicationBuilder(
+			TestChannelBinderConfiguration.getCompleteConfiguration(FunctionUpperCaseConfiguration.class))
+			.web(WebApplicationType.NONE)
+			.run("--spring.jmx.enabled=false",
+				"--spring.cloud.function.definition=uppercase")) {
+
+			String jsonPayload = "{\"anyFieldName\":\"anyValue\"}";
+			final StreamBridge streamBridge = context.getBean(StreamBridge.class);
+			GenericMessage<String> message = new GenericMessage<>(jsonPayload);
+			streamBridge.send("uppercase-in-0", message);
+
+			OutputDestination output = context.getBean(OutputDestination.class);
 			Message<byte[]> result = output.receive(1000, "uppercase-out-0");
-			MessageHeaders headers = result.getHeaders();
-			assertThat(headers).isNotNull();
-			assertThat(headers.get(MessageUtils.TARGET_PROTOCOL)).isEqualTo("kafka");
-			assertThat(headers.get(MessageHeaders.CONTENT_TYPE)).isEqualTo("application/json");
+
+			checkCommonHeaders(result.getHeaders());
 		}
 	}
 
@@ -127,11 +151,96 @@ void checkMessageWrappedFunctionalConsumer() {
 
 		OutputDestination target = context.getBean(OutputDestination.class);
 		Message<byte[]> message = target.receive(5, "uppercase-out-0");
-		MessageHeaders headers = message.getHeaders();
-		assertThat(headers).isNotNull();
+
+		checkCommonHeaders(message.getHeaders());
+	}
+
+	@Test
+	void checkStringToMapMessageStreamListener() {
+		ApplicationContext context = new SpringApplicationBuilder(
+			StringToMapMessageConfiguration.class).web(WebApplicationType.NONE)
+			.run("--spring.jmx.enabled=false");
+		InputDestination source = context.getBean(InputDestination.class);
+		String jsonPayload = "{\"name\":\"Omer\"}";
+		source.send(new GenericMessage<>(jsonPayload.getBytes()));
+		OutputDestination target = context.getBean(OutputDestination.class);
+		Message<byte[]> outputMessage = target.receive();
+		checkCommonHeaders(outputMessage.getHeaders());
+	}
+
+	@Test
+	void checkPojoToPojo() {
+		ApplicationContext context = new SpringApplicationBuilder(
+			PojoToPojoConfiguration.class).web(WebApplicationType.NONE)
+			.run("--spring.jmx.enabled=false");
+		InputDestination source = context.getBean(InputDestination.class);
+		String jsonPayload = "{\"name\":\"Omer\"}";
+		source.send(new GenericMessage<>(jsonPayload.getBytes()));
+		OutputDestination target = context.getBean(OutputDestination.class);
+		Message<byte[]> outputMessage = target.receive();
+		checkCommonHeaders(outputMessage.getHeaders());
+	}
+
+	@Test
+	void checkPojoToString() {
+		ApplicationContext context = new SpringApplicationBuilder(
+			PojoToStringConfiguration.class).web(WebApplicationType.NONE)
+			.run("--spring.jmx.enabled=false");
+		InputDestination source = context.getBean(InputDestination.class);
+		OutputDestination target = context.getBean(OutputDestination.class);
+		String jsonPayload = "{\"name\":\"Neso\"}";
+		source.send(new GenericMessage<>(jsonPayload.getBytes()));
+		Message<byte[]> outputMessage = target.receive();
+		checkCommonHeaders(outputMessage.getHeaders());
+	}
+
+	@Test
+	void checkPojoToByteArray() {
+		ApplicationContext context = new SpringApplicationBuilder(
+			PojoToByteArrayConfiguration.class).web(WebApplicationType.NONE)
+			.run("--spring.jmx.enabled=false");
+		InputDestination source = context.getBean(InputDestination.class);
+		OutputDestination target = context.getBean(OutputDestination.class);
+		String jsonPayload = "{\"name\":\"Neptune\"}";
+		source.send(new GenericMessage<>(jsonPayload.getBytes()));
+		Message<byte[]> outputMessage = target.receive();
+		checkCommonHeaders(outputMessage.getHeaders());
+	}
+
+	@Test
+	void checkStringToPojoInboundContentTypeHeader() {
+		ApplicationContext context = new SpringApplicationBuilder(
+			StringToPojoConfiguration.class).web(WebApplicationType.NONE)
+			.run("--spring.jmx.enabled=false");
+		InputDestination source = context.getBean(InputDestination.class);
+		OutputDestination target = context.getBean(OutputDestination.class);
+		String jsonPayload = "{\"name\":\"Mercury\"}";
+		source.send(new GenericMessage<>(jsonPayload.getBytes(),
+			new MessageHeaders(Collections.singletonMap(MessageHeaders.CONTENT_TYPE,
+				MimeTypeUtils.APPLICATION_JSON_VALUE))));
+		Message<byte[]> outputMessage = target.receive();
+		checkCommonHeaders(outputMessage.getHeaders());
+	}
+
+	@Test
+	void checkPojoMessageToStringMessage() {
+		ApplicationContext context = new SpringApplicationBuilder(
+			PojoMessageToStringMessageConfiguration.class)
+			.web(WebApplicationType.NONE).run("--spring.jmx.enabled=false");
+		InputDestination source = context.getBean(InputDestination.class);
+		OutputDestination target = context.getBean(OutputDestination.class);
+		String jsonPayload = "{\"name\":\"Earth\"}";
+		source.send(new GenericMessage<>(jsonPayload.getBytes()));
+		Message<byte[]> outputMessage = target.receive();
+		MessageHeaders headers = outputMessage.getHeaders();
+		assertThat(BuildInformationProvider.isVersionValid((String) headers.get(BinderHeaders.SCST_VERSION))).isTrue();
+	}
+
+	private void checkCommonHeaders(MessageHeaders headers) {
 		assertThat(headers).isNotNull();
-		assertThat(headers.get(MessageHeaders.CONTENT_TYPE)).isEqualTo("application/json");
 		assertThat(headers.get(MessageUtils.TARGET_PROTOCOL)).isEqualTo("kafka");
+		assertThat(headers.get(MessageHeaders.CONTENT_TYPE)).isEqualTo("application/json");
+		assertThat(BuildInformationProvider.isVersionValid((String) headers.get(BinderHeaders.SCST_VERSION))).isTrue();
 	}
 
 	@EnableAutoConfiguration
@@ -156,6 +265,97 @@ public Function<String, String> uppercase() {
 		}
 	}
 
+	@EnableTestBinder
+	@EnableAutoConfiguration
+	public static class StringToMapMessageConfiguration {
+		@Bean
+		public Function<Message<Map<?, ?>>, String> echo() {
+			return value -> {
+				assertThat(value.getPayload() instanceof Map).isTrue();
+				return (String) value.getPayload().get("name");
+			};
+		}
+	}
+
+	@EnableTestBinder
+	@EnableAutoConfiguration
+	public static class PojoToPojoConfiguration {
+
+		@Bean
+		public Function<Planet, Planet> echo() {
+			return value -> value;
+		}
+	}
+
+	@EnableTestBinder
+	@EnableAutoConfiguration
+	public static class PojoToStringConfiguration {
+
+		@Bean
+		public Function<Planet, String> echo() {
+			return Planet::toString;
+		}
+	}
+
+	@EnableTestBinder
+	@EnableAutoConfiguration
+	public static class PojoToByteArrayConfiguration {
+
+		@Bean
+		public Function<Planet, byte[]> echo() {
+			return value -> value.toString().getBytes(StandardCharsets.UTF_8);
+		}
+	}
+
+	@EnableTestBinder
+	@EnableAutoConfiguration
+	public static class StringToPojoConfiguration {
+
+		@Bean
+		public Function<String, Planet> echo(JsonMapper mapper) {
+			return value -> mapper.fromJson(value, Planet.class);
+		}
+	}
+
+	@EnableTestBinder
+	@EnableAutoConfiguration
+	public static class PojoMessageToStringMessageConfiguration {
+
+		@Bean
+		public Function<Message<Planet>, Message<String>> echo() {
+			return value -> MessageBuilder.withPayload(value.getPayload().toString())
+				.setHeader("expected-content-type", MimeTypeUtils.TEXT_PLAIN_VALUE)
+				.build();
+		}
+	}
+
+	public static class Planet {
+
+		private String name;
+
+		Planet() {
+			this(null);
+		}
+
+		Planet(String name) {
+			this.name = name;
+		}
+
+		public String getName() {
+			return this.name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		@Override
+		public String toString() {
+			return this.name;
+		}
+
+	}
+
 	public static class EmptyPojo {
 
 	}