[ONOS-4176] Implement influxdb retriever for querying metrics

Change-Id: Ia1f3fc4fb3c76fafd003320940b8fe16b039ddae

@@ -21,5 +21,10 @@
         <bundle>mvn:${project.groupId}/onos-app-influxdb/${project.version}</bundle>
         <bundle>mvn:${project.groupId}/onos-app-influxdb/${project.version}</bundle>
         <bundle>wrap:mvn:com.izettle/metrics-influxdb/1.1.1$Bundle-SymbolicName=metrics-influxdb&amp;Bundle-Version=1.1.1</bundle>
         <bundle>wrap:mvn:com.izettle/metrics-influxdb/1.1.1$Bundle-SymbolicName=metrics-influxdb&amp;Bundle-Version=1.1.1</bundle>
         <bundle>mvn:commons-codec/commons-codec/1.10</bundle>
         <bundle>mvn:commons-codec/commons-codec/1.10</bundle>
+        <bundle>wrap:mvn:org.influxdb/influxdb-java/2.1$Bundle-SymbolicName=influxdb-java&amp;Bundle-Version=2.1</bundle>
+        <bundle>wrap:mvn:com.squareup.retrofit/retrofit/1.9.0$Bundle-SymbolicName=retrofit&amp;Bundle-Version=1.9.0</bundle>
+        <bundle>wrap:mvn:com.squareup.okhttp/okhttp/2.4.0$Bundle-SymbolicName=okhttp&amp;Bundle-Version=2.4.0</bundle>
+        <bundle>wrap:mvn:com.squareup.okio/okio/1.4.0$Bundle-SymbolicName=okio&amp;Bundle-Version=1.4.0</bundle>
+        <bundle>mvn:com.google.code.gson/gson/2.3.1</bundle>
     </feature>
     </feature>
 </features>
 </features>

@@ -71,6 +71,11 @@
             <version>1.1.1</version>
             <version>1.1.1</version>
         </dependency>
         </dependency>
         <dependency>
         <dependency>
+            <groupId>org.influxdb</groupId>
+            <artifactId>influxdb-java</artifactId>
+            <version>2.1</version>
+        </dependency>
+        <dependency>
             <groupId>org.onosproject</groupId>
             <groupId>org.onosproject</groupId>
             <artifactId>onos-api</artifactId>
             <artifactId>onos-api</artifactId>
             <version>${project.version}</version>
             <version>${project.version}</version>

+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * 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.
+ */
+package org.onosproject.influxdbmetrics;
+
+import org.apache.commons.lang.StringUtils;
+import org.joda.time.DateTime;
+import org.joda.time.format.DateTimeFormat;
+import org.joda.time.format.DateTimeFormatter;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Default implementation of influx metric.
+ */
+public final class DefaultInfluxMetric implements InfluxMetric {
+
+    private double oneMinRate;
+    private DateTime time;
+
+    private DefaultInfluxMetric(double oneMinRate, DateTime time) {
+        this.oneMinRate = oneMinRate;
+        this.time = time;
+    }
+
+    @Override
+    public double oneMinRate() {
+        return oneMinRate;
+    }
+
+    @Override
+    public DateTime time() {
+        return time;
+    }
+
+    public static final class Builder implements InfluxMetric.Builder {
+
+        private double oneMinRate;
+        private String timestamp;
+        private static final String TIMESTAMP_MSG = "Must specify a timestamp.";
+        private static final String ONE_MIN_RATE_MSG = "Must specify one minute rate.";
+
+        public Builder() {
+        }
+
+        @Override
+        public InfluxMetric.Builder oneMinRate(double rate) {
+            this.oneMinRate = rate;
+            return this;
+        }
+
+        @Override
+        public InfluxMetric.Builder time(String time) {
+            this.timestamp = time;
+            return this;
+        }
+
+        @Override
+        public InfluxMetric build() {
+            checkNotNull(oneMinRate, ONE_MIN_RATE_MSG);
+            checkNotNull(timestamp, TIMESTAMP_MSG);
+
+            return new DefaultInfluxMetric(oneMinRate, parseTime(timestamp));
+        }
+
+        private DateTime parseTime(String time) {
+            String reformatTime = StringUtils.replace(StringUtils.replace(time, "T", " "), "Z", "");
+            DateTimeFormatter formatter = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss");
+            return formatter.parseDateTime(reformatTime);
+        }
+    }
+}

+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * 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.
+ */
+package org.onosproject.influxdbmetrics;
+
+import org.onosproject.cluster.NodeId;
+
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * A Metric retriever interface for querying metrics value from influxDB server.
+ */
+public interface InfluxDbMetricsRetriever {
+
+    /**
+     * Returns last metric values from all nodes.
+     *
+     * @return all metrics from all nodes
+     */
+    Map<NodeId, Map<String, InfluxMetric>> allMetrics();
+
+    /**
+     * Returns last metric values from a node.
+     *
+     * @param nodeId node identification
+     * @return all metrics from a given node
+     */
+    Map<String, InfluxMetric> metricsByNodeId(NodeId nodeId);
+
+    /**
+     * Returns a collection of last metric values from all nodes.
+     *
+     * @param metricName metric name
+     * @return a collection of metrics from all nodes
+     */
+    Map<NodeId, InfluxMetric> metricsByName(String metricName);
+
+    /**
+     * Returns a last metric value from a given node.
+     *
+     * @param nodeId node identification
+     * @param metricName metric name
+     * @return a metric value from a given node
+     */
+    InfluxMetric metric(NodeId nodeId, String metricName);
+
+    /**
+     * Returns metric values of all nodes within a given period of time.
+     *
+     * @param period projected period
+     * @param unit time unit
+     * @return all metric values of all nodes
+     */
+    Map<NodeId, Map<String, List<InfluxMetric>>> allMetrics(int period, TimeUnit unit);
+
+    /**
+     * Returns metric values of a node within a given period of time.
+     *
+     * @param nodeId node identification
+     * @param period projected period
+     * @param unit time unit
+     * @return metric value of a node
+     */
+    Map<String, List<InfluxMetric>> metricsByNodeId(NodeId nodeId, int period, TimeUnit unit);
+
+    /**
+     * Returns a collection of last metric values of all nodes within a given period of time.
+     *
+     * @param metricName metric name
+     * @param period projected period
+     * @param unit time unit
+     * @return metric value of all nodes
+     */
+    Map<NodeId, List<InfluxMetric>> metricsByName(String metricName, int period, TimeUnit unit);
+
+    /**
+     * Returns metric value of a given node within a given period of time.
+     *
+     * @param nodeId node identification
+     * @param metricName metric name
+     * @param period projected period
+     * @param unit time unit
+     * @return metric value of a node
+     */
+    List<InfluxMetric> metric(NodeId nodeId, String metricName, int period, TimeUnit unit);
+}

+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * 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.
+ */
+package org.onosproject.influxdbmetrics;
+
+import org.joda.time.DateTime;
+
+/**
+ * Metric that represents all values queried from influx database.
+ */
+public interface InfluxMetric {
+
+    /**
+     * Returns one minute rate of the given metric.
+     *
+     * @return one minute rate of the given metric
+     */
+    double oneMinRate();
+
+
+    /**
+     * Returns collected timestamp of the given metric.
+     *
+     * @return collected timestamp of the given metric
+     */
+    DateTime time();
+
+    /**
+     * A builder of InfluxMetric.
+     */
+    interface Builder {
+
+        /**
+         * Sets one minute rate.
+         *
+         * @param rate one minute rate
+         * @return builder object
+         */
+        Builder oneMinRate(double rate);
+
+        /**
+         * Sets collected timestamp.
+         *
+         * @param time timestamp
+         * @return builder object
+         */
+        Builder time(String time);
+
+        /**
+         * Builds a influx metric instance.
+         *
+         * @return influx metric instance
+         */
+        InfluxMetric build();
+    }
+}