CBS lookup algorithm

Implement CBS lookup algorithm as docummented on
https://wiki.onap.org/display/DW/MicroServices+Onboarding+in+ONAP#MicroServicesOnboardinginONAP-CodesnippettofetchconfigurationfromConfigbindingservice

Change-Id: Ib465c5fd44b853ba46e152259744dbdd775872a0
Issue-ID: DCAEGEN2-1233
Signed-off-by: Piotr Jaszczyk <piotr.jaszczyk@nokia.com>

3 files changed, 134 insertions, 3 deletions

diff --git a/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/api/EnvPropertiesTest.java b/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/api/EnvPropertiesTest.java
new file mode 100644
index 00000000..b48543d2
--- /dev/null
+++ b/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/api/EnvPropertiesTest.java
@@ -0,0 +1,37 @@
+/*
+ * ============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.cbs.client.api;
+
+
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * @author <a href="mailto:piotr.jaszczyk@nokia.com">Piotr Jaszczyk</a>
+ * @since February 2019
+ */
+class EnvPropertiesTest {
+    @Test
+    void fromEnvironmentShouldFailWhenEnvVariablesAreMissing() {
+        assertThatExceptionOfType(NullPointerException.class).isThrownBy(EnvProperties::fromEnvironment);
+    }
+}
\ No newline at end of file
diff --git a/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/impl/CbsLookupTest.java b/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/impl/CbsLookupTest.java
new file mode 100644
index 00000000..e7513852
--- /dev/null
+++ b/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/impl/CbsLookupTest.java
@@ -0,0 +1,94 @@
+/*
+ * ============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.cbs.client.impl;
+
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParser;
+import java.io.InputStreamReader;
+import java.net.InetSocketAddress;
+import org.junit.jupiter.api.Test;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.EnvProperties;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.ImmutableEnvProperties;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.impl.adapters.CloudHttpClient;
+import reactor.core.publisher.Mono;
+import reactor.test.StepVerifier;
+
+/**
+ * @author <a href="mailto:piotr.jaszczyk@nokia.com">Piotr Jaszczyk</a>
+ * @since February 2019
+ */
+class CbsLookupTest {
+
+    private final EnvProperties env = ImmutableEnvProperties.builder()
+            .cbsName("cbs-service")
+            .consulHost("consul.local")
+            .consulPort(8050)
+            .appName("whatever").build();
+    private final CloudHttpClient httpClient = mock(CloudHttpClient.class);
+    private final CbsLookup cut = new CbsLookup(httpClient);
+
+    @Test
+    void lookupShouldReturnValidConfiguration() {
+        // given
+        givenConsulResponse(parseResource("/consul_cbs_service.json").getAsJsonArray());
+
+        // when
+        final InetSocketAddress result = cut.lookup(env).block();
+
+        // then
+        assertThat(result.getHostString()).isEqualTo("config-binding-service");
+        assertThat(result.getPort()).isEqualTo(10000);
+    }
+
+    @Test
+    void lookupShouldReturnEmptyResultWhenServiceArrayIsEmpty() {
+        // given
+        givenConsulResponse(new JsonArray());
+
+        // when
+        final Mono<InetSocketAddress> result = cut.lookup(env);
+
+        // then
+        StepVerifier.create(result).verifyComplete();
+    }
+
+    private JsonElement parseResource(String resource) {
+        return new JsonParser().parse(new InputStreamReader(CbsLookupTest.class.getResourceAsStream(resource)));
+    }
+
+    private void givenConsulResponse(JsonArray jsonArray) {
+        final String url = "http://"
+                + env.consulHost()
+                + ":"
+                + env.consulPort()
+                + "/v1/catalog/service/"
+                + env.cbsName();
+        given(httpClient.callHttpGet(url, JsonArray.class))
+                .willReturn(Mono.just(jsonArray));
+    }
+
+}
\ No newline at end of file
diff --git a/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/providers/ReactiveCloudConfigurationProviderTest.java b/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/providers/ReactiveCloudConfigurationProviderTest.java
index 5d6ef6bc..4e8782b6 100644
--- a/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/providers/ReactiveCloudConfigurationProviderTest.java
+++ b/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/providers/ReactiveCloudConfigurationProviderTest.java
@@ -27,9 +27,9 @@ import com.google.gson.Gson;
 import com.google.gson.JsonArray;
 import com.google.gson.JsonObject;
 import org.junit.jupiter.api.Test;
-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.onap.dcaegen2.services.sdk.rest.services.cbs.client.http.configuration.ImmutableEnvProperties;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.ImmutableEnvProperties;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.impl.adapters.CloudHttpClient;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.EnvProperties;
 import reactor.core.publisher.Mono;
 import reactor.test.StepVerifier;