Added cbs API

* one main cloudConfigurationProvider
* Mixing string and object property passed to API
* added maven-shade plugin

Change-Id: Idcd66fd70c20c859b5b6f94524f3fdb709fdfc57
Issue-ID: DCAEGEN2-982
Signed-off-by: wasala <przemyslaw.wasala@nokia.com>

5 files changed, 445 insertions, 7 deletions

diff --git a/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/http/configuration/CloudHttpClient.java b/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/http/configuration/CloudHttpClient.java
new file mode 100644
index 00000000..f3177e4c
--- /dev/null
+++ b/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/http/configuration/CloudHttpClient.java
@@ -0,0 +1,97 @@
+/*
+ * ============LICENSE_START=======================================================
+ * DCAEGEN2-SERVICES-SDK
+ * ================================================================================
+ * 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.sdk.rest.services.cbs.client.http.configuration;
+
+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;
+
+/**
+ * @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;
+    private final WebClient webClient;
+
+    public CloudHttpClient() {
+        this(WebClient.builder().filter(logRequest()).filter(logResponse()).build());
+    }
+
+    CloudHttpClient(WebClient webClient) {
+        this.gson = new Gson();
+        this.webClient = webClient;
+    }
+
+    public <T> Mono<T> callHttpGet(String url, Class<T> genericClassDeclaration) {
+        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, genericClassDeclaration));
+    }
+
+    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> genericClassDeclaration) {
+        try {
+            return Mono.just(parseJson(body, genericClassDeclaration));
+        } catch (JsonSyntaxException | IllegalStateException e) {
+            return Mono.error(e);
+        }
+    }
+
+    private <T> T parseJson(String body, Class<T> genericClassDeclaration) {
+        return gson.fromJson(body, genericClassDeclaration);
+    }
+
+    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);
+        });
+    }
+
+}
diff --git a/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/DummyClient.java b/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/http/configuration/EnvProperties.java
index 9a80eeda..2438a2b8 100644
--- a/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/DummyClient.java
+++ b/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/http/configuration/EnvProperties.java
@@ -18,18 +18,31 @@
  * ============LICENSE_END=========================================================
  */
 
-package org.onap.dcaegen2.services.sdk.rest.services.cbs.client;
+package org.onap.dcaegen2.services.sdk.rest.services.cbs.client.http.configuration;
+
+import org.immutables.value.Value;
 
 /**
- * @author <a href="mailto:przemyslaw.wasala@nokia.com">Przemysław Wąsala</a> on 11/14/18
- * @version 1.0.0
+ * Immutable object which helps with construction of cloudRequestObject for specified Client. For usage take a look in
+ * CloudConfigurationClient.class
  *
- * Sample Class empty class / checking that java documentation will be created by maven
+ * @author <a href="mailto:przemyslaw.wasala@nokia.com">Przemysław Wąsala</a> on 11/16/18
+ * @version 1.0.0 can be passed to ReactiveCloudConfigurationProvider, can be constructed out of
+ * org.onap.dcaegen2.services.sdk library.
+ * @since 1.0.0
  */
-public class DummyClient {
+@Value.Immutable(prehash = true)
+public interface EnvProperties {
+
+    @Value.Parameter
+    String consulHost();
 
-    public void print() {
+    @Value.Parameter
+    Integer consulPort();
 
-    }
+    @Value.Parameter
+    String cbsName();
 
+    @Value.Parameter
+    String appName();
 }
diff --git a/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/providers/CloudConfigurationClient.java b/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/providers/CloudConfigurationClient.java
new file mode 100644
index 00000000..3fb8da60
--- /dev/null
+++ b/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/providers/CloudConfigurationClient.java
@@ -0,0 +1,116 @@
+/*
+ * ============LICENSE_START=======================================================
+ * DCAEGEN2-SERVICES-SDK
+ * ================================================================================
+ * 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.sdk.rest.services.cbs.client.providers;
+
+import com.google.gson.JsonObject;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.http.configuration.EnvProperties;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.http.configuration.ImmutableEnvProperties;
+import org.springframework.stereotype.Service;
+import reactor.core.publisher.Mono;
+
+/**
+ * Complete CloudConfiguration HTTPClient API.
+ *
+ * @author <a href="mailto:przemyslaw.wasala@nokia.com">Przemysław Wąsala</a> on 11/16/18
+ * @version 1.0.0
+ * @since 1.0.0
+ */
+@Service
+public final class CloudConfigurationClient implements CloudConfigurationProvider {
+
+    private final CloudConfigurationProvider cloudConfigurationProvider;
+
+    /**
+     * Default constructor for CloudConfigurationClient, set CloudConfigurationProvider cloudConfigurationProvider
+     * property by calling: {@link ReactiveCloudConfigurationProvider}.
+     * Calls other constructor in this class {@link #CloudConfigurationClient(CloudConfigurationProvider)}.
+     */
+    public CloudConfigurationClient() {
+        this(new ReactiveCloudConfigurationProvider());
+    }
+
+    /**
+     * Constructor for CloudConfigurationClient, set loudConfigurationProvider cloudConfigurationProvider property
+     * by passing them in constructor {@link org.onap.dcaegen2.services.sdk.rest.services.cbs.client.providers.CloudConfigurationProvider}
+     * implementation client.
+     *
+     * @param cloudConfigurationProvider - client provider for calling ConfigBindingService
+     */
+    public CloudConfigurationClient(
+        CloudConfigurationProvider cloudConfigurationProvider) {
+        this.cloudConfigurationProvider = cloudConfigurationProvider;
+    }
+
+    /**
+     * Documentation in {@link org.onap.dcaegen2.services.sdk.rest.services.cbs.client.providers.CloudConfigurationProvider}
+     *
+     * @param consulHost - Hostname/IPAddress of consul Database
+     * @param consulPort - Port number of consul Database
+     * @param cbsName - ConfigBindingService url
+     * @param appName - ApplicationName for each config will be returned
+     */
+    @Override
+    public Mono<JsonObject> callForServiceConfigurationReactive(String consulHost, int consulPort, String cbsName,
+        String appName) {
+        return cloudConfigurationProvider.callForServiceConfigurationReactive(
+            ImmutableEnvProperties.builder().consulHost(consulHost)
+                .consulPort(consulPort).cbsName(cbsName)
+                .appName(appName).build());
+    }
+
+    /**
+     * Documentation in {@link org.onap.dcaegen2.services.sdk.rest.services.cbs.client.providers.CloudConfigurationProvider}.
+     *
+     * @param envProperties - Object holds consulPort, consulURL, configBindingSeriveName, applicationName which have
+     * been defined in dcaegen2 cloud environment.
+     */
+    @Override
+    public Mono<JsonObject> callForServiceConfigurationReactive(EnvProperties envProperties) {
+        return cloudConfigurationProvider.callForServiceConfigurationReactive(envProperties);
+    }
+
+    /**
+     * Documentation in {@link org.onap.dcaegen2.services.sdk.rest.services.cbs.client.providers.CloudConfigurationProvider}.
+     *
+     * @param consulHost - Hostname/IPAddress of consul Database
+     * @param consulPort - Port number of consul Database
+     * @param cbsName - ConfigBindingService url
+     * @param appName - ApplicationName for each config will be returned
+     */
+    @Override
+    public JsonObject callForServiceConfiguration(String consulHost, int consulPort, String cbsName, String appName) {
+        return cloudConfigurationProvider.callForServiceConfigurationReactive(
+            ImmutableEnvProperties.builder().consulHost(consulHost)
+                .consulPort(consulPort).cbsName(cbsName)
+                .appName(appName).build()).block();
+    }
+
+    /**
+     * Documentation in {@link org.onap.dcaegen2.services.sdk.rest.services.cbs.client.providers.CloudConfigurationProvider}.
+     *
+     * @param envProperties - Object holds consulPort, consulURL, configBindingSeriveName, applicationName which have
+     */
+    @Override
+    public JsonObject callForServiceConfiguration(EnvProperties envProperties) {
+        return cloudConfigurationProvider.callForServiceConfigurationReactive(envProperties).block();
+    }
+}
diff --git a/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/providers/CloudConfigurationProvider.java b/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/providers/CloudConfigurationProvider.java
new file mode 100644
index 00000000..f8486f6f
--- /dev/null
+++ b/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/providers/CloudConfigurationProvider.java
@@ -0,0 +1,90 @@
+/*
+ * ============LICENSE_START=======================================================
+ * DCAEGEN2-SERVICES-SDK
+ * ================================================================================
+ * 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.sdk.rest.services.cbs.client.providers;
+
+import com.google.gson.JsonObject;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.http.configuration.EnvProperties;
+import reactor.core.publisher.Mono;
+
+/**
+ * Rest CloudConfigurationClient interface which will define all necessary methods in connection with downloading JSON
+ * for each component in DCAEGEN2 repository.
+ *
+ * This interface holds contract for user-defined client or our defined implementation in CBS-client module.
+ *
+ * @author <a href="mailto:przemyslaw.wasala@nokia.com">Przemysław Wąsala</a> on 11/16/18
+ * @version 1.0.0 has got only one implementation of this interface: 1. ReactiveCloudConfigurationProvider.class
+ * @since 1.0.0
+ */
+public interface CloudConfigurationProvider {
+
+    /* callForServiceConfigurationReactive */
+
+    /**
+     * Getting configuration for appName from ConfigBindingService.
+     *
+     * @param envProperties - Object holds consulPort, consulURL, configBindingSeriveName, applicationName which have
+     * been defined in dcaegen2 cloud environment.
+     * @return Single reactive response which @Mono which holds inside them JsonObject with configuration for specified
+     * application Name
+     */
+    Mono<JsonObject> callForServiceConfigurationReactive(EnvProperties envProperties);
+
+    /* callForServiceConfigurationReactive */
+
+    /**
+     * Getting configuration for appName from ConfigBindingService.
+     *
+     * @param consulHost - Hostname/IPAddress of consul Database
+     * @param consulPort - Port number of consul Database
+     * @param cbsName - ConfigBindingService url
+     * @param appName - ApplicationName for each config will be returned
+     * @return rective configuration for specified application in dcaegen2 cloud infrastructure.
+     */
+    Mono<JsonObject> callForServiceConfigurationReactive(String consulHost, int consulPort, String cbsName,
+        String appName);
+
+
+    /*callForServiceConfiguration*/
+
+    /**
+     * Getting configuration for appName from ConfigBindingService.
+     *
+     * @param consulHost - Hostname/IPAddress of consul Database
+     * @param consulPort - Port number of consul Database
+     * @param cbsName - ConfigBindingService url
+     * @param appName - ApplicationName for each config will be returned
+     * @return configuration for specified application in dcaegen2 cloud infrastructure.
+     */
+    JsonObject callForServiceConfiguration(String consulHost, int consulPort, String cbsName, String appName);
+
+    /*callForServiceConfiguration*/
+
+    /**
+     * Getting configuration for appName from ConfigBindingService.
+     *
+     * @param envProperties - Object holds consulPort, consulURL, configBindingSeriveName, applicationName which have
+     * @return configuration for specified application in dcaegen2 cloud infrastructure.
+     */
+    JsonObject callForServiceConfiguration(EnvProperties envProperties);
+
+}
diff --git a/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/providers/ReactiveCloudConfigurationProvider.java b/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/providers/ReactiveCloudConfigurationProvider.java
new file mode 100644
index 00000000..88072985
--- /dev/null
+++ b/rest-services/cbs-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/providers/ReactiveCloudConfigurationProvider.java
@@ -0,0 +1,122 @@
+/*
+ * ============LICENSE_START=======================================================
+ * DCAEGEN2-SERVICES-SDK
+ * ================================================================================
+ * 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.sdk.rest.services.cbs.client.providers;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonObject;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.http.configuration.CloudHttpClient;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.http.configuration.EnvProperties;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.web.util.DefaultUriBuilderFactory;
+import reactor.core.publisher.Mono;
+
+/**
+ * @author <a href="mailto:przemyslaw.wasala@nokia.com">Przemysław Wąsala</a> on 11/15/18
+ */
+final class ReactiveCloudConfigurationProvider implements CloudConfigurationProvider {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(ReactiveCloudConfigurationProvider.class);
+    private static final String EXCEPTION_MESSAGE = "Unsupported method call: ";
+
+    private final CloudHttpClient cloudHttpClient;
+
+    public ReactiveCloudConfigurationProvider() {
+        this(new CloudHttpClient());
+    }
+
+    ReactiveCloudConfigurationProvider(
+        CloudHttpClient cloudHttpClient) {
+        this.cloudHttpClient = cloudHttpClient;
+    }
+
+    @Override
+    public Mono<JsonObject> callForServiceConfigurationReactive(EnvProperties envProperties) {
+        return callConsulForConfigBindingServiceEndpoint(envProperties)
+            .flatMap(this::callConfigBindingServiceForPrhConfiguration);
+    }
+
+    @Override
+    public Mono<JsonObject> callForServiceConfigurationReactive(String consulHost, int consulPort, String cbsName,
+        String appName) {
+        throw new UnsupportedOperationException(EXCEPTION_MESSAGE + this);
+    }
+
+    @Override
+    public JsonObject callForServiceConfiguration(String consulHost, int consulPort, String cbsName, String appName) {
+        throw new UnsupportedOperationException(EXCEPTION_MESSAGE + this);
+    }
+
+    @Override
+    public JsonObject callForServiceConfiguration(EnvProperties envProperties) {
+        throw new UnsupportedOperationException(EXCEPTION_MESSAGE + this);
+    }
+
+    private Mono<String> callConsulForConfigBindingServiceEndpoint(EnvProperties envProperties) {
+        LOGGER.info("Retrieving Config Binding Service endpoint from Consul");
+        return cloudHttpClient.callHttpGet(getConsulUrl(envProperties), JsonArray.class)
+            .flatMap(jsonArray -> this.createConfigBindingServiceUrl(jsonArray, envProperties.appName()));
+    }
+
+    private String getConsulUrl(EnvProperties envProperties) {
+        return getUri(envProperties.consulHost(), envProperties.consulPort(), "/v1/catalog/service",
+            envProperties.cbsName());
+    }
+
+    private Mono<JsonObject> callConfigBindingServiceForPrhConfiguration(String configBindingServiceUri) {
+        LOGGER.info("Retrieving PRH configuration");
+        return cloudHttpClient.callHttpGet(configBindingServiceUri, JsonObject.class);
+    }
+
+
+    private Mono<String> createConfigBindingServiceUrl(JsonArray jsonArray, String appName) {
+        return getConfigBindingObject(jsonArray)
+            .flatMap(jsonObject -> buildConfigBindingServiceUrl(jsonObject, appName));
+    }
+
+    private Mono<String> buildConfigBindingServiceUrl(JsonObject jsonObject, String appName) {
+        return Mono.just(getUri(jsonObject.get("ServiceAddress").getAsString(),
+            jsonObject.get("ServicePort").getAsInt(), "/service_component", appName));
+    }
+
+    private Mono<JsonObject> getConfigBindingObject(JsonArray jsonArray) {
+        try {
+            if (jsonArray.size() > 0) {
+                return Mono.just(jsonArray.get(0).getAsJsonObject());
+            } else {
+                throw new IllegalStateException("JSON Array was empty");
+            }
+        } catch (IllegalStateException e) {
+            LOGGER.warn("Failed to retrieve JSON Object from array", e);
+            return Mono.error(e);
+        }
+    }
+
+    private String getUri(String host, Integer port, String... paths) {
+        return new DefaultUriBuilderFactory().builder()
+            .scheme("http")
+            .host(host)
+            .port(port)
+            .path(String.join("/", paths))
+            .build().toString();
+    }
+}