1 files changed, 93 insertions, 0 deletions
diff --git a/prh-app-server/src/main/java/org/onap/dcaegen2/services/prh/service/HttpGetClient.java b/prh-app-server/src/main/java/org/onap/dcaegen2/services/prh/service/HttpGetClient.java
new file mode 100644
index 00000000..56ab484b
--- /dev/null
+++ b/prh-app-server/src/main/java/org/onap/dcaegen2/services/prh/service/HttpGetClient.java
@@ -0,0 +1,93 @@
+/*
+ * ============LICENSE_START=======================================================
+ * PNF-REGISTRATION-HANDLER
+ * ================================================================================
+ * Copyright (C) 2018 NOKIA Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcaegen2.services.prh.service;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonSyntaxException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.reactive.function.client.ClientResponse;
+import org.springframework.web.reactive.function.client.ExchangeFilterFunction;
+import org.springframework.web.reactive.function.client.WebClient;
+import reactor.core.publisher.Mono;
+
+public class HttpGetClient {
+
+    private static final Logger logger = LoggerFactory.getLogger(HttpGetClient.class);
+
+    private final WebClient webClient;
+    private final Gson gson;
+
+    HttpGetClient() {
+        this(WebClient.builder().filter(logRequest()).filter(logResponse()).build());
+    }
+
+    HttpGetClient(WebClient webClient){
+        this.webClient = webClient;
+        this.gson = new Gson();
+    }
+
+    public <T> Mono<T> callHttpGet(String url, Class<T> tClass) {
+        return webClient
+            .get()
+            .uri(url)
+            .retrieve()
+            .onStatus(HttpStatus::is4xxClientError, response -> Mono.error(getException(response)))
+            .onStatus(HttpStatus::is5xxServerError, response -> Mono.error(getException(response)))
+            .bodyToMono(String.class)
+            .flatMap(body->getJsonFromRequest(body,tClass));
+    }
+
+    private RuntimeException getException(ClientResponse response) {
+        return new RuntimeException(String.format("Request for cloud config failed: HTTP %d",
+            response.statusCode().value()));
+    }
+
+    private <T> Mono<T> getJsonFromRequest(String body, Class<T> tClass) {
+        try {
+            return Mono.just(parseJson(body, tClass));
+        } catch (JsonSyntaxException | IllegalStateException e) {
+            logger.warn("Converting string to json threw error ", e);
+            return Mono.error(e);
+        }
+    }
+
+    private <T> T  parseJson(String body, Class<T> tClass){
+        return gson.fromJson(body, tClass);
+    }
+
+    private static ExchangeFilterFunction logResponse() {
+        return ExchangeFilterFunction.ofResponseProcessor(clientResponse -> {
+            logger.info("Response status {}", clientResponse.statusCode());
+            return Mono.just(clientResponse);
+        });
+    }
+
+    private static ExchangeFilterFunction logRequest() {
+        return ExchangeFilterFunction.ofRequestProcessor(clientRequest -> {
+            logger.info("Request: {} {}", clientRequest.method(), clientRequest.url());
+            clientRequest.headers()
+                .forEach((name, values) -> values.forEach(value -> logger.info("{}={}", name, value)));
+            return Mono.just(clientRequest);
+        });
+    }
+}