X-Git-Url: https://gerrit.o-ran-sc.org/r/gitweb?a=blobdiff_plain;f=policy-agent%2Fsrc%2Fmain%2Fjava%2Forg%2Foransc%2Fpolicyagent%2Fclients%2FAsyncRestClient.java;h=26d5152895a46ba50951d494e51acb0bc638ce6a;hb=51716d5ce50b8e9b776a2f648261e5191ed921b8;hp=0a7c3a180a91a5b8bb227226aa9629189726983b;hpb=336d24471b994ebe62828d5327e116f766bbfc85;p=nonrtric.git

diff --git a/policy-agent/src/main/java/org/oransc/policyagent/clients/AsyncRestClient.java b/policy-agent/src/main/java/org/oransc/policyagent/clients/AsyncRestClient.java
index 0a7c3a18..26d51528 100644
--- a/policy-agent/src/main/java/org/oransc/policyagent/clients/AsyncRestClient.java
+++ b/policy-agent/src/main/java/org/oransc/policyagent/clients/AsyncRestClient.java
@@ -20,84 +20,205 @@
 
 package org.oransc.policyagent.clients;
 
+import io.netty.channel.ChannelOption;
+import io.netty.handler.ssl.SslContext;
+import io.netty.handler.ssl.SslContextBuilder;
+import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
+import io.netty.handler.timeout.ReadTimeoutHandler;
+import io.netty.handler.timeout.WriteTimeoutHandler;
+
 import java.lang.invoke.MethodHandles;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import javax.net.ssl.SSLException;
 
 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 WebClient webClient = null;
+    private final String baseUrl;
+    private static final AtomicInteger sequenceNumber = new AtomicInteger();
 
-    public class AsyncRestClientException extends Exception {
+    public AsyncRestClient(String baseUrl) {
+        this.baseUrl = baseUrl;
+    }
 
-        private static final long serialVersionUID = 1L;
+    public Mono<ResponseEntity<String>> postForEntity(String uri, @Nullable String body) {
+        Object traceTag = createTraceTag();
+        logger.debug("{} POST uri = '{}{}''", traceTag, baseUrl, uri);
+        logger.trace("{} POST body: {}", traceTag, body);
+        Mono<String> bodyProducer = body != null ? Mono.just(body) : Mono.empty();
+        return getWebClient() //
+            .flatMap(client -> {
+                RequestHeadersSpec<?> request = client.post() //
+                    .uri(uri) //
+                    .contentType(MediaType.APPLICATION_JSON) //
+                    .body(bodyProducer, String.class);
+                return retrieve(traceTag, request);
+            });
+    }
 
-        public AsyncRestClientException(String message) {
-            super(message);
-        }
+    public Mono<String> post(String uri, @Nullable String body) {
+        return postForEntity(uri, body) //
+            .flatMap(this::toBody);
     }
 
-    public AsyncRestClient(String baseUrl) {
-        this.client = WebClient.create(baseUrl);
+    public Mono<String> postWithAuthHeader(String uri, String body, String username, String password) {
+        Object traceTag = createTraceTag();
+        logger.debug("{} POST (auth) uri = '{}{}''", traceTag, baseUrl, uri);
+        logger.trace("{} POST body: {}", traceTag, body);
+        return getWebClient() //
+            .flatMap(client -> {
+                RequestHeadersSpec<?> request = client.post() //
+                    .uri(uri) //
+                    .headers(headers -> headers.setBasicAuth(username, password)) //
+                    .contentType(MediaType.APPLICATION_JSON) //
+                    .bodyValue(body);
+                return retrieve(traceTag, request) //
+                    .flatMap(this::toBody);
+            });
     }
 
-    public Mono<String> post(String uri, String body) {
-        return client.post() //
-            .uri(uri) //
-            .contentType(MediaType.APPLICATION_JSON) //
-            .bodyValue(body) //
-            .retrieve() //
-            .onStatus(HttpStatus::isError,
-                response -> Mono.error(new AsyncRestClientException(response.statusCode().toString()))) //
-            .bodyToMono(String.class);
+    public Mono<ResponseEntity<String>> putForEntity(String uri, String body) {
+        Object traceTag = createTraceTag();
+        logger.debug("{} PUT uri = '{}{}''", traceTag, baseUrl, uri);
+        logger.trace("{} PUT body: {}", traceTag, body);
+        return getWebClient() //
+            .flatMap(client -> {
+                RequestHeadersSpec<?> request = client.put() //
+                    .uri(uri) //
+                    .contentType(MediaType.APPLICATION_JSON) //
+                    .bodyValue(body);
+                return retrieve(traceTag, request);
+            });
     }
 
-    public Mono<String> postWithAuthHeader(String uri, String body, String username, String password) {
-        return client.post() //
-            .uri(uri) //
-            .headers(headers -> headers.setBasicAuth(username, password)) //
-            .contentType(MediaType.APPLICATION_JSON) //
-            .bodyValue(body) //
-            .retrieve() //
-            .onStatus(HttpStatus::isError,
-                response -> Mono.error(new AsyncRestClientException(response.statusCode().toString()))) //
-            .bodyToMono(String.class);
+    public Mono<ResponseEntity<String>> putForEntity(String uri) {
+        Object traceTag = createTraceTag();
+        logger.debug("{} PUT uri = '{}{}''", traceTag, baseUrl, uri);
+        logger.trace("{} PUT body: <empty>", traceTag);
+        return getWebClient() //
+            .flatMap(client -> {
+                RequestHeadersSpec<?> request = client.put() //
+                    .uri(uri);
+                return retrieve(traceTag, request);
+            });
     }
 
     public Mono<String> put(String uri, String body) {
-        logger.debug("PUT uri = '{}''", uri);
-        return client.put() //
-            .uri(uri) //
-            .contentType(MediaType.APPLICATION_JSON) //
-            .bodyValue(body) //
-            .retrieve() //
-            .onStatus(HttpStatus::isError,
-                response -> Mono.error(new AsyncRestClientException(response.statusCode().toString()))) //
-            .bodyToMono(String.class);
+        return putForEntity(uri, body) //
+            .flatMap(this::toBody);
+    }
+
+    public Mono<ResponseEntity<String>> getForEntity(String uri) {
+        Object traceTag = createTraceTag();
+        logger.debug("{} GET uri = '{}{}''", traceTag, baseUrl, uri);
+        return getWebClient() //
+            .flatMap(client -> {
+                RequestHeadersSpec<?> request = client.get().uri(uri);
+                return retrieve(traceTag, request);
+            });
     }
 
     public Mono<String> get(String uri) {
-        logger.debug("GET uri = '{}''", uri);
-        return client.get() //
-            .uri(uri) //
-            .retrieve() //
-            .onStatus(HttpStatus::isError,
-                response -> Mono.error(new AsyncRestClientException(response.statusCode().toString()))) //
-            .bodyToMono(String.class);
+        return getForEntity(uri) //
+            .flatMap(this::toBody);
+    }
+
+    public Mono<ResponseEntity<String>> deleteForEntity(String uri) {
+        Object traceTag = createTraceTag();
+        logger.debug("{} DELETE uri = '{}{}''", traceTag, baseUrl, uri);
+        return getWebClient() //
+            .flatMap(client -> {
+                RequestHeadersSpec<?> request = client.delete().uri(uri);
+                return retrieve(traceTag, 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(Object traceTag, RequestHeadersSpec<?> request) {
+        return request.retrieve() //
+            .toEntity(String.class) //
+            .doOnNext(entity -> logger.trace("{} Received: {}", traceTag, entity.getBody()))
+            .doOnError(throwable -> onHttpError(traceTag, throwable));
     }
+
+    private static Object createTraceTag() {
+        return sequenceNumber.incrementAndGet();
+    }
+
+    private void onHttpError(Object traceTag, Throwable t) {
+        if (t instanceof WebClientResponseException) {
+            WebClientResponseException exception = (WebClientResponseException) t;
+            logger.debug("{} HTTP error status = '{}', body '{}'", traceTag, exception.getStatusCode(),
+                exception.getResponseBodyAsString());
+        } else {
+            logger.debug("{} HTTP error: {}", traceTag, t.getMessage());
+        }
+    }
+
+    private Mono<String> toBody(ResponseEntity<String> entity) {
+        if (entity.getBody() == null) {
+            return Mono.just("");
+        } else {
+            return Mono.just(entity.getBody());
+        }
+    }
+
+    private static SslContext createSslContext() throws SSLException {
+        return SslContextBuilder.forClient() //
+            .trustManager(InsecureTrustManagerFactory.INSTANCE) //
+            .build();
+    }
+
+    private static WebClient createWebClient(String baseUrl, SslContext sslContext) {
+        TcpClient tcpClient = TcpClient.create() //
+            .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10_000) //
+            .secure(c -> c.sslContext(sslContext)) //
+            .doOnConnected(connection -> {
+                connection.addHandler(new ReadTimeoutHandler(30));
+                connection.addHandler(new WriteTimeoutHandler(30));
+            });
+        HttpClient httpClient = HttpClient.from(tcpClient);
+        ReactorClientHttpConnector connector = new ReactorClientHttpConnector(httpClient);
+
+        return WebClient.builder() //
+            .clientConnector(connector) //
+            .baseUrl(baseUrl) //
+            .build();
+    }
+
+    private Mono<WebClient> getWebClient() {
+        if (this.webClient == null) {
+            try {
+                SslContext sslContext = createSslContext();
+                this.webClient = createWebClient(this.baseUrl, sslContext);
+            } catch (SSLException e) {
+                logger.error("Could not create WebClient {}", e.getMessage());
+                return Mono.error(e);
+            }
+        }
+        return Mono.just(this.webClient);
+    }
+
 }