* limitations under the License.
* ========================LICENSE_END===================================
*/
+
package org.oransc.policyagent.clients;
+import io.netty.channel.ChannelOption;
+import io.netty.handler.timeout.ReadTimeoutHandler;
+import io.netty.handler.timeout.WriteTimeoutHandler;
+
import java.lang.invoke.MethodHandles;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
-import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.client.reactive.ReactorClientHttpConnector;
+import org.springframework.lang.Nullable;
import org.springframework.web.reactive.function.client.WebClient;
+import org.springframework.web.reactive.function.client.WebClient.RequestHeadersSpec;
+import org.springframework.web.reactive.function.client.WebClientResponseException;
+
import reactor.core.publisher.Mono;
+import reactor.netty.http.client.HttpClient;
+import reactor.netty.tcp.TcpClient;
+/**
+ * Generic reactive REST client.
+ */
public class AsyncRestClient {
private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
private final WebClient client;
+ private final String baseUrl;
+
+ public AsyncRestClient(String baseUrl) {
- private static class AsyncRestClientException extends Exception {
+ TcpClient tcpClient = TcpClient.create() //
+ .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10_000) //
+ .doOnConnected(connection -> {
+ connection.addHandler(new ReadTimeoutHandler(10));
+ connection.addHandler(new WriteTimeoutHandler(30));
+ });
+ HttpClient httpClient = HttpClient.from(tcpClient);
+ ReactorClientHttpConnector connector = new ReactorClientHttpConnector(httpClient);
- private static final long serialVersionUID = 1L;
+ this.client = WebClient.builder() //
+ .clientConnector(connector) //
+ .baseUrl(baseUrl) //
+ .build();
- public AsyncRestClientException(String message) {
- super(message);
- }
+ this.baseUrl = baseUrl;
}
- public AsyncRestClient(String baseUrl) {
- this.client = WebClient.create(baseUrl);
+ public Mono<ResponseEntity<String>> postForEntity(String uri, @Nullable String body) {
+ logger.debug("POST uri = '{}{}''", baseUrl, uri);
+ Mono<String> bodyProducer = body != null ? Mono.just(body) : Mono.empty();
+ RequestHeadersSpec<?> request = client.post() //
+ .uri(uri) //
+ .contentType(MediaType.APPLICATION_JSON) //
+ .body(bodyProducer, String.class);
+ return retrieve(request);
}
- public Mono<String> put(String uri, String body) {
- logger.debug("PUT uri = '{}''", uri);
- return client.put() //
+ public Mono<String> post(String uri, @Nullable String body) {
+ return postForEntity(uri, body) //
+ .flatMap(this::toBody);
+ }
+
+ public Mono<String> postWithAuthHeader(String uri, String body, String username, String password) {
+ logger.debug("POST (auth) uri = '{}{}''", baseUrl, uri);
+ RequestHeadersSpec<?> request = client.post() //
.uri(uri) //
+ .headers(headers -> headers.setBasicAuth(username, password)) //
.contentType(MediaType.APPLICATION_JSON) //
- .syncBody(body) //
- .retrieve() //
- .onStatus(HttpStatus::isError,
- response -> Mono.error(new AsyncRestClientException(response.statusCode().toString()))) //
- .bodyToMono(String.class);
+ .bodyValue(body);
+ return retrieve(request) //
+ .flatMap(this::toBody);
}
- public Mono<String> get(String uri) {
- logger.debug("GET uri = '{}''", uri);
- return client.get() //
+ public Mono<ResponseEntity<String>> putForEntity(String uri, String body) {
+ logger.debug("PUT uri = '{}{}''", baseUrl, uri);
+ RequestHeadersSpec<?> request = client.put() //
.uri(uri) //
- .retrieve() //
- .onStatus(HttpStatus::isError,
- response -> Mono.error(new AsyncRestClientException(response.statusCode().toString()))) //
- .bodyToMono(String.class);
+ .contentType(MediaType.APPLICATION_JSON) //
+ .bodyValue(body);
+ return retrieve(request);
+ }
+
+ public Mono<ResponseEntity<String>> putForEntity(String uri) {
+ logger.debug("PUT uri = '{}{}''", baseUrl, uri);
+ RequestHeadersSpec<?> request = client.put() //
+ .uri(uri);
+ return retrieve(request);
+ }
+
+ public Mono<String> put(String uri, String body) {
+ return putForEntity(uri, body) //
+ .flatMap(this::toBody);
+ }
+
+ public Mono<ResponseEntity<String>> getForEntity(String uri) {
+ logger.debug("GET uri = '{}{}''", baseUrl, uri);
+ RequestHeadersSpec<?> request = client.get().uri(uri);
+ return retrieve(request);
+ }
+
+ public Mono<String> get(String uri) {
+ return getForEntity(uri) //
+ .flatMap(this::toBody);
+ }
+
+ public Mono<ResponseEntity<String>> deleteForEntity(String uri) {
+ logger.debug("DELETE uri = '{}{}''", baseUrl, uri);
+ RequestHeadersSpec<?> request = client.delete().uri(uri);
+ return retrieve(request);
}
public Mono<String> delete(String uri) {
- logger.debug("DELETE uri = '{}''", uri);
- return client.delete() //
- .uri(uri) //
- .retrieve() //
- .onStatus(HttpStatus::isError,
- response -> Mono.error(new AsyncRestClientException(response.statusCode().toString()))) //
- .bodyToMono(String.class);
+ return deleteForEntity(uri) //
+ .flatMap(this::toBody);
}
+
+ private Mono<ResponseEntity<String>> retrieve(RequestHeadersSpec<?> request) {
+ return request.retrieve() //
+ .toEntity(String.class) //
+ .doOnError(this::onHttpError);
+ }
+
+ private void onHttpError(Throwable t) {
+ if (t instanceof WebClientResponseException) {
+ WebClientResponseException exception = (WebClientResponseException) t;
+ logger.debug("HTTP error status = '{}', body '{}'", exception.getStatusCode(),
+ exception.getResponseBodyAsString());
+ } else {
+ logger.debug("HTTP error: {}", t.getMessage());
+ }
+ }
+
+ private Mono<String> toBody(ResponseEntity<String> entity) {
+ if (entity.getBody() == null) {
+ return Mono.just("");
+ } else {
+ return Mono.just(entity.getBody());
+ }
+ }
+
}
Code Review / nonrtric.git / blobdiff