Remove Spring stuff from DMaaP

Change-Id: Id441d0dce89fcb24b5558af7bdf996a74eba78e6
Issue-ID: DCAEGEN2-1245
Signed-off-by: Marcin Migdal <marcin.migdal@nokia.com>

1 files changed, 117 insertions, 0 deletions

diff --git a/rest-services/common-dependency/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/adapters/http/CloudHttpClient.java b/rest-services/common-dependency/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/adapters/http/CloudHttpClient.java
new file mode 100644
index 00000000..cba5c6af
--- /dev/null
+++ b/rest-services/common-dependency/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/adapters/http/CloudHttpClient.java
@@ -0,0 +1,117 @@
+/*
+ * ============LICENSE_START====================================
+ * DCAEGEN2-SERVICES-SDK
+ * =========================================================
+ * Copyright (C) 2019 Nokia. 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.sdk.rest.services.adapters.http;
+
+import com.google.gson.Gson;
+import io.netty.handler.codec.http.HttpStatusClass;
+import io.netty.handler.ssl.SslContext;
+import io.vavr.collection.Stream;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Map;
+import java.util.function.BiConsumer;
+import java.util.stream.Collectors;
+import org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import reactor.core.publisher.Mono;
+import reactor.netty.http.client.HttpClient;
+import reactor.netty.http.client.HttpClientRequest;
+import reactor.netty.http.client.HttpClientResponse;
+
+/**
+ * @author <a href="mailto:przemyslaw.wasala@nokia.com">Przemysław Wąsala</a> on 11/15/18
+ */
+
+public class CloudHttpClient {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(CloudHttpClient.class);
+    private final Gson gson = new Gson();
+    private final HttpClient httpClient;
+
+    public CloudHttpClient() {
+        this(HttpClient.create());
+    }
+
+    public CloudHttpClient(SslContext sslContext) {
+        this(HttpClient.create().secure(sslContextSpec -> sslContextSpec.sslContext(sslContext)));
+    }
+
+    private CloudHttpClient(HttpClient httpClient) {
+        this.httpClient = httpClient;
+
+    }
+
+    public <T> Mono<T> get(String url, RequestDiagnosticContext context, Class<T> bodyClass) {
+        return get(url, context, Collections.EMPTY_MAP, bodyClass);
+    }
+
+    public <T> Mono<T> get(String url, RequestDiagnosticContext context, Map<String, String> customHeaders, Class<T> bodyClass) {
+        final HttpClient clientWithHeaders = httpClient
+            .doOnRequest((req, conn) -> logRequest(context, req))
+            .doOnResponse((rsp, conn) -> logResponse(context, rsp))
+            .headers(hdrs -> context.remoteCallHttpHeaders().forEach((BiConsumer<String, String>) hdrs::set))
+            .headers(hdrs -> customHeaders.forEach(hdrs::set));
+        return callHttpGet(clientWithHeaders, url, bodyClass);
+    }
+
+    public <T> Mono<T> get(String url, Class<T> bodyClass) {
+        return callHttpGet(httpClient, url, bodyClass);
+    }
+
+    private <T> Mono<T> callHttpGet(HttpClient client, String url, Class<T> bodyClass) {
+        return client.get()
+            .uri(url)
+            .responseSingle((resp, content) -> HttpStatusClass.SUCCESS.contains(resp.status().code())
+                ? content.asString()
+                : Mono.error(createException(url, resp)))
+            .map(body -> parseJson(body, bodyClass));
+    }
+
+    private Exception createException(String url, HttpClientResponse response) {
+        return new IOException(String.format("Request failed for URL '%s'. Response code: %s",
+            url,
+            response.status()));
+    }
+
+    private <T> T parseJson(String body, Class<T> bodyClass) {
+        return gson.fromJson(body, bodyClass);
+    }
+
+    private void logRequest(RequestDiagnosticContext context, HttpClientRequest httpClientRequest) {
+        context.withSlf4jMdc(LOGGER.isDebugEnabled(), () -> {
+            LOGGER.debug("Request: {} {}", httpClientRequest.method(), httpClientRequest.uri());
+            if (LOGGER.isTraceEnabled()) {
+                final String headers = Stream.ofAll(httpClientRequest.requestHeaders())
+                    .map(entry -> entry.getKey() + "=" + entry.getValue())
+                    .collect(Collectors.joining("\n"));
+                LOGGER.trace(headers);
+            }
+        });
+    }
+
+    private void logResponse(RequestDiagnosticContext context, HttpClientResponse httpClientResponse) {
+        context.withSlf4jMdc(LOGGER.isDebugEnabled(), () -> {
+            LOGGER.debug("Response status: {}", httpClientResponse.status());
+        });
+    }
+}
+