First draft Energy Savings POLICY_TO_SDNR handler

Initial commit of a karaf feature to process a DMaaP topic sent by
Policy to SDNR as part of the Energy Savings project.  The topic name
is POLICY_TO_SDNR, and the content is a large and complex JSON
structure. Currently, this feature simply forwards the JSON string to
a server and returns the response of the server to Policy in topic
SDNR_TO_POLICY.

Change-Id: I84cb891c98fb23f5dfe44a9e3ad8ce69afb72405
Issue-ID: CCSDK-350
Signed-off-by: George Clapp <gc731h@att.com>

1 files changed, 273 insertions, 0 deletions

diff --git a/sdnr/northbound/energysavings/provider/src/main/java/org/onap/ccsdk/features/sdnr/northbound/impl/EnergysavingsProvider.java b/sdnr/northbound/energysavings/provider/src/main/java/org/onap/ccsdk/features/sdnr/northbound/impl/EnergysavingsProvider.java
new file mode 100644
index 000000000..d39ce9baa
--- /dev/null
+++ b/sdnr/northbound/energysavings/provider/src/main/java/org/onap/ccsdk/features/sdnr/northbound/impl/EnergysavingsProvider.java
@@ -0,0 +1,273 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP : CCSDK
+ * ================================================================================
+ * Copyright (C) 2017 AT&T 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.ccsdk.features.sdnr.northbound.impl;
+
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Properties;
+import java.util.concurrent.Future;
+import javax.ws.rs.HttpMethod;
+import javax.ws.rs.core.MediaType;
+import org.opendaylight.controller.md.sal.binding.api.DataBroker;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.energysavings.rev150105.EnergysavingsService;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.energysavings.rev150105.PayloadInput;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.energysavings.rev150105.PayloadInputBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.energysavings.rev150105.PayloadOutput;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.energysavings.rev150105.PayloadOutputBuilder;
+import org.opendaylight.yangtools.yang.common.RpcResult;
+import org.opendaylight.yangtools.yang.common.RpcResultBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.opendaylight.controller.sal.binding.api.RpcProviderRegistry;
+import org.opendaylight.controller.sal.binding.api.BindingAwareBroker.RpcRegistration;
+import com.google.common.base.Preconditions;
+import com.google.common.util.concurrent.Futures;
+import com.sun.jersey.api.client.Client;
+import com.sun.jersey.api.client.ClientResponse;
+import com.sun.jersey.api.client.WebResource;
+import com.sun.jersey.api.client.config.ClientConfig;
+import com.sun.jersey.api.client.config.DefaultClientConfig;
+import com.sun.jersey.api.client.filter.HTTPBasicAuthFilter;
+
+public class EnergysavingsProvider implements EnergysavingsService {
+
+    private static final Logger LOG = LoggerFactory.getLogger(EnergysavingsProvider.class);
+
+    private final String appName = "EnergySavings";
+
+    private final DataBroker dataBroker;
+    private final RpcProviderRegistry rpcProviderRegistry;
+    private RpcRegistration<EnergysavingsService> serviceRegistration;
+
+    // Locations and names of the configuration files
+    private static final String SDNC_CONFIG_DIR = "SDNC_CONFIG_DIR";
+    private static final String PROPERTIES_FILE_NAME = "sdnr-energy-savings.properties";
+    private static final String PARSING_ERROR =
+            "Could not create the request message to send to the server; no message will be sent";
+
+    /*
+     * Use a flag veryFirstTime to ensure that some tasks are done only once. The value is set here and
+     * during initialization.
+     */
+    private Boolean veryFirstTime = true;
+
+    // Parameters for the REST calls
+
+    // to publish SDNR_TO_POLICY DMaaP topic
+    private WebResource dmaapSdnrToPolicyWebResource = null;
+
+    // to the Energy Savings server
+    private WebResource energySavingsWebResource = null;
+
+    public EnergysavingsProvider(final DataBroker dataBroker, RpcProviderRegistry rpcProviderRegistry) {
+        this.dataBroker = dataBroker;
+        this.rpcProviderRegistry = rpcProviderRegistry;
+    }
+
+    /**
+     * Method called when the blueprint container is created.
+     */
+    public void init() {
+        serviceRegistration = rpcProviderRegistry.addRpcImplementation(EnergysavingsService.class, this);
+
+        LOG.debug("Initializing provider for " + appName);
+
+        Preconditions.checkNotNull(dataBroker, "dataBroker must be set");
+
+        // Set the initialization flag so some tasks will be done only once
+        veryFirstTime = true;
+
+        // Read parameters from the properties file in SDNC_CONFIG_DIR
+        String propDir = System.getenv(SDNC_CONFIG_DIR);
+        if (propDir == null) {
+            LOG.error("Environment variable SDNC_CONFIG_DIR is not set");
+            propDir = "/opt/onap/ccsdk/data/properties/";
+        } else if (!propDir.endsWith("/")) {
+            propDir = propDir + "/";
+        }
+
+        // Get the parameters for the REST calls
+        HashMap<String, String> dmaapPolicyHttpParams = new HashMap<String, String>();
+        HashMap<String, String> energySavingsServerHttpParams = new HashMap<String, String>();
+
+        try {
+            FileInputStream fileInput = new FileInputStream(propDir + PROPERTIES_FILE_NAME);
+            Properties properties = new Properties();
+            properties.load(fileInput);
+            fileInput.close();
+
+            for (String param : new String[] {"url", "httpMethod", "authentication", "user", "password"}) {
+                dmaapPolicyHttpParams.put(param, properties.getProperty("dmaapPolicy." + param));
+                energySavingsServerHttpParams.put(param, properties.getProperty("energySavingsServer." + param));
+            }
+        } catch (FileNotFoundException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        // Create a web resource for the Energy Savings server
+        ClientConfig esClientConfig = new DefaultClientConfig();
+        // 3 minute read time out
+        esClientConfig.getProperties().put(ClientConfig.PROPERTY_READ_TIMEOUT, 180000);
+        // 1 minute connect time out
+        esClientConfig.getProperties().put(ClientConfig.PROPERTY_CONNECT_TIMEOUT, 60000);
+        Client esClient = Client.create(esClientConfig);
+
+        // Authentication for the Energy Savings server
+        if (energySavingsServerHttpParams.get("authentication").equals("basic")) {
+            esClient.addFilter(new HTTPBasicAuthFilter(energySavingsServerHttpParams.get("user"),
+                    energySavingsServerHttpParams.get("password")));
+            energySavingsWebResource = esClient.resource(energySavingsServerHttpParams.get("url"));
+        } else if (energySavingsServerHttpParams.get("authentication").equals("none")) {
+            energySavingsWebResource = esClient.resource(energySavingsServerHttpParams.get("url"));
+        } else {
+            LOG.error("Unexpected value for energy savings server authentication: "
+                    + energySavingsServerHttpParams.get("authentication"));
+        }
+
+        // Create a web resource for the DMaaP SDNR_TO_POLICY topic
+        ClientConfig dmaapClientConfig = new DefaultClientConfig();
+        // 3 minute read time out
+        dmaapClientConfig.getProperties().put(ClientConfig.PROPERTY_READ_TIMEOUT, 180000);
+        // 1 minute connect time out
+        dmaapClientConfig.getProperties().put(ClientConfig.PROPERTY_CONNECT_TIMEOUT, 60000);
+        Client dmaapClient = Client.create(dmaapClientConfig);
+
+        // Authentication for the DMaaP message router
+        if (dmaapPolicyHttpParams.get("authentication").equals("basic")) {
+            dmaapClient.addFilter(
+                    new HTTPBasicAuthFilter(dmaapPolicyHttpParams.get("user"), dmaapPolicyHttpParams.get("password")));
+            dmaapSdnrToPolicyWebResource = dmaapClient.resource(dmaapPolicyHttpParams.get("url"));
+        } else if (dmaapPolicyHttpParams.get("authentication").equals("none")) {
+            dmaapSdnrToPolicyWebResource = dmaapClient.resource(dmaapPolicyHttpParams.get("url"));
+        } else {
+            LOG.error("Unexpected value for DMaaP message router authentication: "
+                    + dmaapPolicyHttpParams.get("authentication"));
+        }
+
+        LOG.debug("energySavingsServerHttpParams: " + Collections.singletonList(energySavingsServerHttpParams));
+        LOG.debug("dmaapPolicyHttpParams: " + Collections.singletonList(dmaapPolicyHttpParams));
+        LOG.debug("Initialization complete for " + appName);
+    }
+
+    /**
+     * Method called when the blueprint container is destroyed.
+     */
+    public void close() {
+        LOG.debug("EnergysavingsProvider Closed");
+    }
+
+    @Override
+    public Future<RpcResult<PayloadOutput>> payload(PayloadInput input) {
+
+        /*
+         * Policy has published a POLICY_TO_SDNR DMaaP topic. Currently, this feature simply forwards the
+         * input to the Energy Savings server untouched.
+         */
+
+        // Assume success
+        Boolean requestSucceeded = true;
+
+        // Build the result now so error messages can be included in the response
+        PayloadOutputBuilder resultBuilder = new PayloadOutputBuilder();
+
+        if (input == null) {
+            LOG.error("Input is null");
+            resultBuilder.setResult("Input is null");
+            requestSucceeded = false;
+        } else {
+            try {
+                PayloadInputBuilder inputBuilder = new PayloadInputBuilder(input);
+                input = inputBuilder.build();
+                LOG.debug("Received payload: " + input.getPayload());
+            } catch (Exception e) {
+                LOG.error("Cannot build input");
+                resultBuilder.setResult(e.toString() + " : " + e.getMessage());
+                requestSucceeded = false;
+            }
+        }
+
+        /*
+         * See if the web resources were created during initialization. No use in proceeding if not.
+         */
+        if (energySavingsWebResource == null) {
+            LOG.error("energySavingsWebResouce is null");
+            resultBuilder.setResult("energySavingsWebResource is null");
+            requestSucceeded = false;
+        }
+
+        if (dmaapSdnrToPolicyWebResource == null) {
+            LOG.error("dmaapSdnrToPolicyWebResouce is null");
+            resultBuilder.setResult("dmaapSdnrToPolicyWebResource is null");
+            requestSucceeded = false;
+        }
+
+        /*
+         * Forward the POLICY_TO_SDNR message to the Energy Savings server
+         */
+
+        ClientResponse response = null;
+        if (requestSucceeded) {
+            try {
+                LOG.debug("Sending message to controller: \n" + input.getPayload());
+                response = energySavingsWebResource.type(MediaType.APPLICATION_JSON).accept(MediaType.APPLICATION_JSON)
+                        .method(HttpMethod.POST, ClientResponse.class, input.getPayload());
+                LOG.debug("Received response from Energy Savings server: \n" + response.toString());
+            } catch (Exception e) {
+                LOG.error("Error while posting POLICY_TO_SDNR input to server:", e);
+                resultBuilder.setResult("Error while posting POLICY_TO_SDNR input to server\n" + e.toString());
+                requestSucceeded = false;
+            }
+        }
+
+        /*
+         * Return the response from the server to Policy using the SDNR_TO_POLICY topic
+         */
+
+        if (requestSucceeded) {
+            String esServerResponse = response.getEntity(String.class);
+            try {
+                LOG.debug("Sending SDNR_TO_POLICY topic: \n" + esServerResponse);
+                response =
+                        dmaapSdnrToPolicyWebResource.type(MediaType.APPLICATION_JSON).accept(MediaType.APPLICATION_JSON)
+                                .method(HttpMethod.POST, ClientResponse.class, esServerResponse);
+                LOG.debug("Received response from DMaaP message router: \n" + response.toString());
+            } catch (Exception e) {
+                LOG.error("Error while posting SDNR_TO_POLICY topic: ", e);
+                resultBuilder.setResult("Error while posting SDNR_TO_POLICY topic:\n" + e.toString());
+                requestSucceeded = false;
+            }
+        }
+
+        if (requestSucceeded) {
+            return Futures.immediateFuture(
+                    RpcResultBuilder.<PayloadOutput>success().withResult(resultBuilder.build()).build());
+        } else {
+            return Futures.immediateFuture(
+                    RpcResultBuilder.<PayloadOutput>failed().withResult(resultBuilder.build()).build());
+        }
+    }
+}