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Add example of Spring WebClient usage (#418)
- Add example of WebClient usage - Add additional test case with WebClient usage Signed-off-by: Dave Syer <[email protected]>
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‎docs/spring.md

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@@ -115,6 +115,18 @@ public Mono<CloudEvent> event(@RequestBody Mono<CloudEvent> body) {
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}
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```
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The `CodecCustomizer` also works on the client side, so you can use it anywhere that you use a `WebClient` (including in an MVC application). Here's a simple example of a Cloud Event HTTP client:
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```java
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WebClient client = ...; // Either WebClient.create() or @Autowired a WebClient.Builder
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CloudEvent event = ...; // Create a CloudEvent
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Mono<CloudEvent> response = client.post()
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.uri("http://localhost:8080/events")
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.bodyValue(event)
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.retrieve()
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.bodyToMono(CloudEvent.class);
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```
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### Messaging
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Spring Messaging is applicable in a wide range of use cases including WebSockets, JMS, Apache Kafka, RabbitMQ and others. It is also a core part of the Spring Cloud Function and Spring Cloud Stream libraries, so those are natural tools to use to build applications that use Cloud Events. The core abstraction in Spring is the `Message` which carries headers and a payload, just like a `CloudEvent`. Since the mapping is quite direct it makes sense to have a set of converters for Spring applications, so you can consume and produce `CloudEvents`, by treating them as `Messages`. This project provides a converter that you can register in a Spring Messaging application:

‎examples/spring-function/src/main/java/io/cloudevents/examples/spring/DemoApplication.java

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import java.util.UUID;
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import java.util.function.Function;
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import io.cloudevents.CloudEvent;
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import io.cloudevents.core.builder.CloudEventBuilder;
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import io.cloudevents.spring.messaging.CloudEventMessageConverter;
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import io.cloudevents.spring.webflux.CloudEventHttpMessageReader;
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import io.cloudevents.spring.webflux.CloudEventHttpMessageWriter;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.boot.web.codec.CodecCustomizer;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.http.codec.CodecConfigurer;
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import org.springframework.web.bind.annotation.RestController;
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import io.cloudevents.CloudEvent;
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import io.cloudevents.core.builder.CloudEventBuilder;
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import io.cloudevents.spring.messaging.CloudEventMessageConverter;
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import io.cloudevents.spring.webflux.CloudEventHttpMessageReader;
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import io.cloudevents.spring.webflux.CloudEventHttpMessageWriter;
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@SpringBootApplication
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@RestController
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public class DemoApplication {
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public static void main(String[] args) throws Exception {

‎examples/spring-reactive/src/test/java/io/cloudevents/examples/spring/DemoApplicationTests.java

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import java.net.URI;
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import org.junit.jupiter.api.Test;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.context.SpringBootTest;
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import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
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import org.springframework.boot.test.web.client.TestRestTemplate;
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import org.springframework.boot.web.server.LocalServerPort;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.MediaType;
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import org.springframework.http.RequestEntity;
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import org.springframework.http.ResponseEntity;
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import org.springframework.test.web.reactive.server.WebTestClient;
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import io.cloudevents.CloudEvent;
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import io.cloudevents.core.builder.CloudEventBuilder;
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import static org.assertj.core.api.Assertions.assertThat;
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@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
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public class DemoApplicationTests {
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@Autowired
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private TestRestTemplate rest;
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@LocalServerPort
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private int port;
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@Test
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void echoWithCorrectHeaders() {
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ResponseEntity<String> response = rest
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.exchange(RequestEntity.post(URI.create("http://localhost:" + port + "/foos")) //
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.header("ce-id", "12345") //
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.header("ce-specversion", "1.0") //
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.header("ce-type", "io.spring.event") //
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.header("ce-source", "https://spring.io/events") //
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.contentType(MediaType.APPLICATION_JSON) //
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.body("{\"value\":\"Dave\"}"), String.class);
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assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
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assertThat(response.getBody()).isEqualTo("{\"value\":\"Dave\"}");
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HttpHeaders headers = response.getHeaders();
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assertThat(headers).containsKey("ce-id");
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assertThat(headers).containsKey("ce-source");
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assertThat(headers).containsKey("ce-type");
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assertThat(headers.getFirst("ce-id")).isNotEqualTo("12345");
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assertThat(headers.getFirst("ce-type")).isEqualTo("io.spring.event.Foo");
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assertThat(headers.getFirst("ce-source")).isEqualTo("https://spring.io/foos");
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}
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@Test
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void structuredRequestResponseEvents() {
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ResponseEntity<String> response = rest
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.exchange(RequestEntity.post(URI.create("http://localhost:" + port + "/event")) //
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.contentType(new MediaType("application", "cloudevents+json")) //
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.body("{" //
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+ "\"id\":\"12345\"," //
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+ "\"specversion\":\"1.0\"," //
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+ "\"type\":\"io.spring.event\"," //
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+ "\"source\":\"https://spring.io/events\"," //
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+ "\"data\":{\"value\":\"Dave\"}}"),
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String.class);
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assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
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assertThat(response.getBody()).isEqualTo("{\"value\":\"Dave\"}");
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HttpHeaders headers = response.getHeaders();
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assertThat(headers).containsKey("ce-id");
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assertThat(headers).containsKey("ce-source");
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assertThat(headers).containsKey("ce-type");
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assertThat(headers.getFirst("ce-id")).isNotEqualTo("12345");
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assertThat(headers.getFirst("ce-type")).isEqualTo("io.spring.event.Foo");
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assertThat(headers.getFirst("ce-source")).isEqualTo("https://spring.io/foos");
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}
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@Test
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void requestResponseEvents() {
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ResponseEntity<String> response = rest
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.exchange(RequestEntity.post(URI.create("http://localhost:" + port + "/event")) //
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.header("ce-id", "12345") //
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.header("ce-specversion", "1.0") //
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.header("ce-type", "io.spring.event") //
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.header("ce-source", "https://spring.io/events") //
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.contentType(MediaType.APPLICATION_JSON) //
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.body("{\"value\":\"Dave\"}"), String.class);
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assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
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assertThat(response.getBody()).isEqualTo("{\"value\":\"Dave\"}");
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HttpHeaders headers = response.getHeaders();
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assertThat(headers).containsKey("ce-id");
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assertThat(headers).containsKey("ce-source");
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assertThat(headers).containsKey("ce-type");
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assertThat(headers.getFirst("ce-id")).isNotEqualTo("12345");
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assertThat(headers.getFirst("ce-type")).isEqualTo("io.spring.event.Foo");
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assertThat(headers.getFirst("ce-source")).isEqualTo("https://spring.io/foos");
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}
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@Autowired
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private WebTestClient rest;
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@Test
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void echoWithCorrectHeaders() {
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rest.post().uri("/foos").header("ce-id", "12345") //
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.header("ce-specversion", "1.0") //
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.header("ce-type", "io.spring.event") //
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.header("ce-source", "https://spring.io/events") //
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.contentType(MediaType.APPLICATION_JSON) //
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.bodyValue("{\"value\":\"Dave\"}") //
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.exchange() //
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.expectStatus().isOk() //
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.expectHeader().exists("ce-id") //
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.expectHeader().exists("ce-source") //
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.expectHeader().exists("ce-type") //
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.expectHeader().value("ce-id", value -> {
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if (value.equals("12345"))
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throw new IllegalStateException();
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}) //
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.expectHeader().valueEquals("ce-type", "io.spring.event.Foo") //
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.expectHeader().valueEquals("ce-source", "https://spring.io/foos") //
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.expectBody(String.class).isEqualTo("{\"value\":\"Dave\"}");
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}
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@Test
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void structuredRequestResponseEvents() {
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rest.post().uri("/event") //
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.contentType(new MediaType("application", "cloudevents+json")) //
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.bodyValue("{" //
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+ "\"id\":\"12345\"," //
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+ "\"specversion\":\"1.0\"," //
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+ "\"type\":\"io.spring.event\"," //
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+ "\"source\":\"https://spring.io/events\"," //
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+ "\"data\":{\"value\":\"Dave\"}}") //
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.exchange() //
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.expectStatus().isOk() //
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.expectHeader().exists("ce-id") //
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.expectHeader().exists("ce-source") //
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.expectHeader().exists("ce-type") //
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.expectHeader().value("ce-id", value -> {
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if (value.equals("12345"))
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throw new IllegalStateException();
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}) //
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.expectHeader().valueEquals("ce-type", "io.spring.event.Foo") //
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.expectHeader().valueEquals("ce-source", "https://spring.io/foos") //
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.expectBody(String.class).isEqualTo("{\"value\":\"Dave\"}");
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}
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@Test
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void structuredRequestResponseCloudEventToString() {
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rest.post().uri("/event") //
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.bodyValue(CloudEventBuilder.v1() //
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.withId("12345") //
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.withType("io.spring.event") //
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.withSource(URI.create("https://spring.io/events")).withData("{\"value\":\"Dave\"}".getBytes()) //
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.build()) //
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.exchange() //
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.expectStatus().isOk() //
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.expectHeader().exists("ce-id") //
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.expectHeader().exists("ce-source") //
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.expectHeader().exists("ce-type") //
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.expectHeader().value("ce-id", value -> {
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if (value.equals("12345"))
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throw new IllegalStateException();
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}) //
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.expectHeader().valueEquals("ce-type", "io.spring.event.Foo") //
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.expectHeader().valueEquals("ce-source", "https://spring.io/foos") //
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.expectBody(String.class).isEqualTo("{\"value\":\"Dave\"}");
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}
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@Test
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void structuredRequestResponseCloudEventToCloudEvent() {
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rest.post().uri("/event") //
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.accept(new MediaType("application", "cloudevents+json")) //
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.bodyValue(CloudEventBuilder.v1() //
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.withId("12345") //
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.withType("io.spring.event") //
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.withSource(URI.create("https://spring.io/events")) //
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.withData("{\"value\":\"Dave\"}".getBytes()) //
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.build()) //
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.exchange() //
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.expectStatus().isOk() //
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.expectHeader().exists("ce-id") //
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.expectHeader().exists("ce-source") //
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.expectHeader().exists("ce-type") //
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.expectHeader().value("ce-id", value -> {
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if (value.equals("12345"))
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throw new IllegalStateException();
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}) //
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.expectHeader().valueEquals("ce-type", "io.spring.event.Foo") //
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.expectHeader().valueEquals("ce-source", "https://spring.io/foos") //
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.expectBody(CloudEvent.class) //
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.value(event -> assertThat(new String(event.getData().toBytes())) //
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.isEqualTo("{\"value\":\"Dave\"}"));
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}
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@Test
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void requestResponseEvents() {
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rest.post().uri("/event").header("ce-id", "12345") //
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.header("ce-specversion", "1.0") //
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.header("ce-type", "io.spring.event") //
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.header("ce-source", "https://spring.io/events") //
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.contentType(MediaType.APPLICATION_JSON) //
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.bodyValue("{\"value\":\"Dave\"}") //
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.exchange() //
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.expectStatus().isOk() //
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.expectHeader().exists("ce-id") //
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.expectHeader().exists("ce-source") //
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.expectHeader().exists("ce-type") //
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.expectHeader().value("ce-id", value -> {
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if (value.equals("12345"))
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throw new IllegalStateException();
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}) //
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.expectHeader().valueEquals("ce-type", "io.spring.event.Foo") //
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.expectHeader().valueEquals("ce-source", "https://spring.io/foos") //
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.expectBody(String.class).isEqualTo("{\"value\":\"Dave\"}");
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}
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}

‎examples/spring-reactive/src/test/java/io/cloudevents/examples/spring/WebClientTests.java

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package io.cloudevents.examples.spring;
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import static org.assertj.core.api.Assertions.assertThat;
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import java.net.URI;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.context.SpringBootTest;
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import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
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import org.springframework.boot.web.server.LocalServerPort;
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import org.springframework.web.reactive.function.client.WebClient;
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import io.cloudevents.CloudEvent;
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import io.cloudevents.core.builder.CloudEventBuilder;
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import reactor.core.publisher.Mono;
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/**
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* Test case to show example usage of WebClient and CloudEvent. The actual
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* content of the request and response are asserted separately in
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* {@link DemoApplicationTests}.
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*/
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@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
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public class WebClientTests {
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@Autowired
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private WebClient.Builder rest;
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@LocalServerPort
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private int port;
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private CloudEvent event;
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@BeforeEach
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void setUp() {
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event = CloudEventBuilder.v1() //
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.withId("12345") //
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.withSource(URI.create("https://spring.io/events")) //
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.withType("io.spring.event") //
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.withData("{\"value\":\"Dave\"}".getBytes()) //
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.build();
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}
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@Test
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void echoWithCorrectHeaders() {
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Mono<CloudEvent> result = rest.build() //
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.post() //
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.uri("http://localhost:" + port + "/event") //
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.bodyValue(event) //
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.exchangeToMono(response -> response.bodyToMono(CloudEvent.class));
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assertThat(result.block().getData()).isEqualTo(event.getData());
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}
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}

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