Proposal to remove OSGi dependencies from the CCSDK project

Dependencies on the OSGi frameworks and libraries are removed
by integrating the CCSDK project with the lighty.io.
It's a toolkit that allows to use ODL services (in this case
core services and the Restconf) without the dependency
on the Karaf framework and the Blueprint DI.

In this change are created the lighty.io modules which
initialize and expose same services as the Blueprint DI in
the blueprint.xml files.

More info about the lighty.io - https://lighty.io

Change-Id: Ia9eed2f60c71b7fc2e93b738c857d290b28e9420
Signed-off-by: Matej Perina <matej.perina@pantheon.tech>
Signed-off-by: Samuel Kontris <samuel.kontris@pantheon.tech>

2 files changed, 228 insertions, 0 deletions

diff --git a/ansible-adapter/ansible-adapter-lighty/src/main/java/org/onap/ccsdk/sli/adaptors/ansible/impl/AnsibleAdapterPropertiesProviderImplLighty.java b/ansible-adapter/ansible-adapter-lighty/src/main/java/org/onap/ccsdk/sli/adaptors/ansible/impl/AnsibleAdapterPropertiesProviderImplLighty.java
new file mode 100755
index 000000000..9690cd61e
--- /dev/null
+++ b/ansible-adapter/ansible-adapter-lighty/src/main/java/org/onap/ccsdk/sli/adaptors/ansible/impl/AnsibleAdapterPropertiesProviderImplLighty.java
@@ -0,0 +1,176 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * onap
+ * ================================================================================
+ * Copyright (C) 2016 - 2017 ONAP
+ * ================================================================================
+ * 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.sli.adaptors.ansible.impl;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Optional;
+import java.util.Properties;
+import java.util.Vector;
+import org.onap.ccsdk.sli.adaptors.ansible.AnsibleAdapterPropertiesProvider;
+import org.onap.ccsdk.sli.core.sli.ConfigurationException;
+import org.onap.ccsdk.sli.core.utils.KarafRootFileResolver;
+import org.onap.ccsdk.sli.core.utils.PropertiesFileResolver;
+import org.onap.ccsdk.sli.core.utils.common.CoreDefaultFileResolver;
+import org.onap.ccsdk.sli.core.utils.common.SdncConfigEnvVarFileResolver;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * THIS CLASS IS A COPY OF {@link AnsibleAdapterPropertiesProviderImpl} WITH REMOVED OSGi DEPENDENCIES
+ */
+public class AnsibleAdapterPropertiesProviderImplLighty implements AnsibleAdapterPropertiesProvider {
+
+    private static final Logger LOG = LoggerFactory.getLogger(AnsibleAdapterPropertiesProviderImplLighty.class);
+
+    /**
+     * The name of the properties file for database configuration
+     */
+    private static final String ANSIBLEADAPTER_PROP_FILE_NAME = "ansible-adapter.properties";
+
+    /**
+     * A prioritized list of strategies for resolving sql-resource properties files.
+     */
+    private Vector<PropertiesFileResolver> ansibleAdapterPropertiesFileResolvers = new Vector<>();
+
+    /**
+     * The configuration properties for the db connection.
+     */
+    private Properties properties;
+
+    /**
+     * Set up the prioritized list of strategies for resolving dblib properties
+     * files.
+     */
+    public AnsibleAdapterPropertiesProviderImplLighty() {
+        ansibleAdapterPropertiesFileResolvers
+                .add(new SdncConfigEnvVarFileResolver("Using property file (1) from environment variable"));
+        ansibleAdapterPropertiesFileResolvers.add(new CoreDefaultFileResolver("Using property file (2) from default directory"));
+
+        ansibleAdapterPropertiesFileResolvers.add(new KarafRootFileResolver("Using property file (4) from karaf root", this));
+
+        // determines properties file as according to the priority described in the
+        // class header comment
+        final File propertiesFile = determinePropertiesFile(this);
+        if (propertiesFile != null) {
+            try (FileInputStream fileInputStream = new FileInputStream(propertiesFile)) {
+                properties = new Properties();
+                properties.load(fileInputStream);
+            } catch (final IOException e) {
+                LOG.error("Failed to load properties for file: {}", propertiesFile.toString(),
+                        new ConfigurationException("Failed to load properties for file: " + propertiesFile.toString(),
+                                e));
+            }
+        } else {
+            // Try to read properties as resource
+
+            InputStream propStr = getClass().getResourceAsStream("/" + ANSIBLEADAPTER_PROP_FILE_NAME);
+            if (propStr != null) {
+                properties = new Properties();
+                try {
+                    properties.load(propStr);
+                    propStr.close();
+                } catch (IOException e) {
+                    properties = null;
+                }
+            }
+
+        }
+
+        if (properties == null) {
+            reportFailure("Missing configuration properties resource(3)", new ConfigurationException(
+                    "Missing configuration properties resource(3): " + ANSIBLEADAPTER_PROP_FILE_NAME));
+
+            LOG.info("Defaulting org.onap.appc.adapter.ansible.clientType to TRUST_ALL");
+
+            properties = new Properties();
+            properties.setProperty("org.onap.appc.adapter.ansible.clientType", "TRUST_ALL");
+        }
+    }
+
+    /**
+     * Extract svclogic config properties.
+     *
+     * @return the svclogic config properties
+     */
+    public Properties getProperties() {
+        return properties;
+    }
+
+    /**
+     * Reports the method chosen for properties resolution to the
+     * <code>Logger</code>.
+     *
+     * @param message
+     *            Some user friendly message
+     * @param fileOptional
+     *            The file location of the chosen properties file
+     * @return the file location of the chosen properties file
+     */
+    private static File reportSuccess(final String message, final Optional<File> fileOptional) {
+        if (fileOptional.isPresent()) {
+            final File file = fileOptional.get();
+            LOG.info("{} {}", message, file.getPath());
+            return file;
+        }
+        return null;
+    }
+
+    /**
+     * Reports fatal errors. This is the case in which no properties file could be
+     * found.
+     *
+     * @param message
+     *            An appropriate fatal error message
+     * @param configurationException
+     *            An exception describing what went wrong during resolution
+     */
+    private static void reportFailure(final String message, final ConfigurationException configurationException) {
+
+        LOG.error("{}", message, configurationException);
+    }
+
+    /**
+     * Determines the sql-resource properties file to use based on the following priority:
+     * <ol>
+     * <li>A directory identified by the system environment variable
+     * <code>SDNC_CONFIG_DIR</code></li>
+     * <li>The default directory <code>DEFAULT_DBLIB_PROP_DIR</code></li>
+     * <li>A directory identified by the JRE argument
+     * <code>sql-resource.properties</code></li>
+     * <li>A <code>sql-resource.properties</code> file located in the karaf root
+     * directory</li>
+     * </ol>
+     */
+    File determinePropertiesFile(final AnsibleAdapterPropertiesProviderImplLighty resourceProvider) {
+
+        for (final PropertiesFileResolver sliPropertiesFileResolver : ansibleAdapterPropertiesFileResolvers) {
+            final Optional<File> fileOptional = sliPropertiesFileResolver.resolveFile(ANSIBLEADAPTER_PROP_FILE_NAME);
+            if (fileOptional.isPresent()) {
+                return reportSuccess(sliPropertiesFileResolver.getSuccessfulResolutionMessage(), fileOptional);
+            }
+        }
+
+        return null;
+    }
+}
diff --git a/ansible-adapter/ansible-adapter-lighty/src/main/java/org/onap/ccsdk/sli/adaptors/ansible/lighty/AnsibleAdapterModule.java b/ansible-adapter/ansible-adapter-lighty/src/main/java/org/onap/ccsdk/sli/adaptors/ansible/lighty/AnsibleAdapterModule.java
new file mode 100644
index 000000000..ae49542b4
--- /dev/null
+++ b/ansible-adapter/ansible-adapter-lighty/src/main/java/org/onap/ccsdk/sli/adaptors/ansible/lighty/AnsibleAdapterModule.java
@@ -0,0 +1,52 @@
+/*
+ * ============LICENSE_START==========================================
+ * Copyright (c) 2019 PANTHEON.tech s.r.o.
+ * ===================================================================
+ * 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.sli.adaptors.ansible.lighty;
+
+import io.lighty.core.controller.api.AbstractLightyModule;
+import org.onap.ccsdk.sli.adaptors.ansible.AnsibleAdapter;
+import org.onap.ccsdk.sli.adaptors.ansible.impl.AnsibleAdapterImpl;
+import org.onap.ccsdk.sli.adaptors.ansible.impl.AnsibleAdapterPropertiesProviderImplLighty;
+
+/**
+ * The implementation of the {@link io.lighty.core.controller.api.LightyModule} that manages and provides services from
+ * the ansible-adaptor artifact.
+ */
+public class AnsibleAdapterModule extends AbstractLightyModule {
+
+    private AnsibleAdapterPropertiesProviderImplLighty ansibleProviderImpl;
+    private AnsibleAdapterImpl ansibleAdapterImpl;
+
+    @Override
+    protected boolean initProcedure() {
+        this.ansibleProviderImpl = new AnsibleAdapterPropertiesProviderImplLighty();
+        this.ansibleAdapterImpl = new AnsibleAdapterImpl(ansibleProviderImpl);
+        return true;
+    }
+
+    @Override
+    protected boolean stopProcedure() {
+        return true;
+    }
+
+    public AnsibleAdapterPropertiesProviderImplLighty getAnsibleAdapterPropertiesProviderImpl() {
+        return this.ansibleProviderImpl;
+    }
+
+    public AnsibleAdapter getAnsibleAdapterImpl() {
+        return ansibleAdapterImpl;
+    }
+}