ONOS-5504: Added REST API for administering OFAgent.

Change-Id: Idc9a18fc82ec23fbb8348fe213f8007e362253ac
diff --git a/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/OFAgentCodec.java b/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/OFAgentCodec.java
new file mode 100644
index 0000000..6e6e772
--- /dev/null
+++ b/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/OFAgentCodec.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2017-present 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.ofagent.rest;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.Sets;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.incubator.net.virtual.NetworkId;
+import org.onosproject.ofagent.api.OFAgent;
+import org.onosproject.ofagent.api.OFController;
+import org.onosproject.ofagent.impl.DefaultOFAgent;
+
+import java.util.Set;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Preconditions.checkState;
+
+/**
+ * OpenFlow agent JSON codec.
+ */
+public final class OFAgentCodec extends JsonCodec<OFAgent> {
+
+    @Override
+    public ObjectNode encode(OFAgent ofAgent, CodecContext context) {
+        checkNotNull(ofAgent, "OFAgent cannot be null");
+
+        ObjectMapper mapper = context.mapper();
+        ObjectNode ofAgentNode = mapper.createObjectNode();
+        ofAgentNode
+                .put("networkId", ofAgent.networkId().toString())
+                .put("state", ofAgent.state().toString());
+
+        ArrayNode controllers = mapper.createArrayNode();
+        ofAgent.controllers().forEach(ofController -> controllers.add((new OFControllerCodec()).encode(ofController,
+                                                                                                       context)));
+        ofAgentNode.set("controllers", controllers);
+
+        return ofAgentNode;
+    }
+
+    public OFAgent decode(ObjectNode json, CodecContext context) {
+        JsonNode networkId = json.get("networkId");
+        checkNotNull(networkId);
+
+        checkNotNull(json.get("controllers"));
+        checkState(json.get("controllers").isArray());
+        Set<OFController> controllers = Sets.newHashSet();
+        json.get("controllers").forEach(jsonController -> controllers.add((new
+                OFControllerCodec()).decode((ObjectNode) jsonController, context)));
+
+        return DefaultOFAgent.builder()
+                .networkId(NetworkId.networkId(networkId.asLong()))
+                .controllers(controllers)
+                .state(OFAgent.State.STOPPED)
+                .build();
+    }
+
+}
diff --git a/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/OFAgentWebApplication.java b/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/OFAgentWebApplication.java
new file mode 100644
index 0000000..173e1cd
--- /dev/null
+++ b/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/OFAgentWebApplication.java
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2017-present 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.ofagent.rest;
+
+import org.onlab.rest.AbstractWebApplication;
+
+import java.util.Set;
+
+
+/**
+ * OFAgent Web application.
+ */
+public class OFAgentWebApplication extends AbstractWebApplication {
+    @Override
+    public Set<Class<?>> getClasses() {
+        return getClasses(OFAgentWebResource.class);
+    }
+}
diff --git a/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/OFAgentWebResource.java b/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/OFAgentWebResource.java
new file mode 100644
index 0000000..58d22a1
--- /dev/null
+++ b/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/OFAgentWebResource.java
@@ -0,0 +1,241 @@
+/*
+ * Copyright 2017-present 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.ofagent.rest;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.incubator.net.virtual.NetworkId;
+import org.onosproject.ofagent.api.OFAgent;
+import org.onosproject.ofagent.api.OFAgentAdminService;
+import org.onosproject.ofagent.api.OFAgentService;
+import org.onosproject.rest.AbstractWebResource;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.PUT;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import static javax.ws.rs.core.Response.Status.*;
+
+
+/**
+ * Manage virtual switch and controller mapping.
+ */
+@Path("service")
+public class OFAgentWebResource extends AbstractWebResource {
+
+    private static final String OFAGENT_NOT_FOUND = "OFAgent not found";
+    private static final String OFAGENTS_NOT_FOUND = "OFAgent set not found";
+    private static final String OFAGENT_CREATED = "OFAgent created";
+    private static final String OFAGENT_NOT_CREATED = "OFAgent not created";
+    private static final String OFAGENT_STARTED = "OFAgent started";
+    private static final String OFAGENT_NOT_STARTED = "OFAgent not started";
+    private static final String OFAGENT_UPDATED = "OFAgent updated";
+    private static final String OFAGENT_NOT_UPDATED = "OFAgent not updated";
+
+     /**
+     * Lists OpenFlow agents.
+     * Shows OpenFlow agents for all virtual networks.
+     *
+     * @return 200 OK if set exists, 500 INTERNAL SERVER ERROR otherwise
+     */
+    @GET
+    @Path("ofagents")
+    public Response listOFAgents() {
+        OFAgentService service = get(OFAgentService.class);
+        ObjectMapper mapper = new ObjectMapper();
+        ObjectNode root = mapper.createObjectNode();
+        ArrayNode ofAgentsArray = mapper.createArrayNode();
+        if (service.agents() == null) {
+            return Response.status(INTERNAL_SERVER_ERROR)
+                    .entity(OFAGENTS_NOT_FOUND).build();
+        } else {
+            service.agents().forEach(ofAgent -> ofAgentsArray.add((new OFAgentCodec()).encode(ofAgent, this)));
+
+            root.set("ofAgents", ofAgentsArray);
+            return Response.ok(root, MediaType.APPLICATION_JSON_TYPE).build();
+        }
+
+    }
+
+    /**
+     * Lists OpenFlow agent.
+     * Shows OpenFlow agent for given network.
+     *
+     * @param networkId OFAgent networkId
+     * @return 200 OK if OFAgent exists, 404 NOT FOUND otherwise
+     */
+    @GET
+    @Path("ofagent/{networkId}")
+    public Response listOFAgent(@PathParam("networkId") long networkId) {
+        OFAgentService service = get(OFAgentService.class);
+        OFAgent ofAgent = service.agent(NetworkId.networkId(networkId));
+        if (ofAgent == null) {
+            return Response.status(NOT_FOUND)
+                    .entity(OFAGENT_NOT_FOUND).build();
+        } else {
+            return Response.ok((new OFAgentCodec()).encode(ofAgent, this), MediaType
+                    .APPLICATION_JSON_TYPE)
+                    .build();
+        }
+    }
+
+    /**
+     * Adds a new OpenFlow agent.
+     * Creates a new OpenFlow agent and adds it to OpenFlow agent store.
+     *
+     * @param stream JSON stream
+     * @return 201 CREATED , 400 BAD REQUEST if stream cannot be decoded to OFAgent
+     * @throws IOException if request cannot be parsed
+     */
+    @POST
+    @Path("ofagent-create")
+    @Consumes(MediaType.APPLICATION_JSON)
+    public Response createOFAgent(InputStream stream) throws IOException {
+        OFAgentAdminService adminService = get(OFAgentAdminService.class);
+
+        OFAgent ofAgent = (new OFAgentCodec()).decode((ObjectNode) mapper().readTree(stream), this);
+        if (ofAgent == null) {
+            return Response.status(BAD_REQUEST)
+                    .entity(OFAGENT_NOT_CREATED).build();
+        } else {
+            adminService.createAgent(ofAgent);
+            return Response.status(CREATED).entity(OFAGENT_CREATED).build();
+        }
+    }
+
+    /**
+     * Starts OpenFlow agent.
+     * Starts OpenFlow agent for the given network.
+     *
+     * @param stream JSON stream
+     * @return 200 OK if OFAgent was started, 404 NOT FOUND when OF agent does not exist, 400 BAD REQUEST otherwise
+     * @throws IOException if request cannot be parsed
+     */
+    @POST
+    @Path("ofagent-start")
+    @Consumes(MediaType.APPLICATION_JSON)
+    public Response startOFAgent(InputStream stream) throws IOException {
+        OFAgentAdminService adminService = get(OFAgentAdminService.class);
+
+        ObjectNode jsonTree = (ObjectNode) mapper().readTree(stream);
+        JsonNode networkId = jsonTree.get("networkId");
+
+        if (networkId == null) {
+            return Response.status(BAD_REQUEST)
+                    .entity(OFAGENT_NOT_STARTED).build();
+        } else if (get(OFAgentService.class).agent(NetworkId.networkId(networkId.asLong())) == null) {
+            return Response.status(NOT_FOUND)
+                    .entity(OFAGENT_NOT_STARTED).build();
+        } else {
+            adminService.startAgent(NetworkId.networkId(networkId.asLong()));
+            return Response.status(OK).entity(OFAGENT_STARTED).build();
+        }
+    }
+
+    /**
+     * Updates OpenFlow agent.
+     * Updates existing OpenFlow agent for the given network.
+     *
+     * @param stream JSON stream
+     * @return 200 OK if OFAgent was updated, 404 NOT FOUND when OF agent does not exist, 400 BAD REQUEST otherwise
+     * @throws IOException if request cannot be parsed
+     */
+    @PUT
+    @Path("ofagent-update")
+    @Consumes(MediaType.APPLICATION_JSON)
+    public Response updateOFAgent(InputStream stream) throws IOException {
+        OFAgentAdminService adminService = get(OFAgentAdminService.class);
+
+        OFAgent ofAgent = (new OFAgentCodec()).decode((ObjectNode) mapper().readTree(stream), this);
+
+        if (ofAgent == null) {
+            return Response.status(NOT_FOUND)
+                    .entity(OFAGENT_NOT_UPDATED).build();
+        } else if (get(OFAgentService.class).agent(ofAgent.networkId()) == null) {
+            return Response.status(NOT_FOUND)
+                    .entity(OFAGENT_NOT_UPDATED).build();
+        }
+
+        adminService.updateAgent(ofAgent);
+        return Response.status(OK).entity(OFAGENT_UPDATED).build();
+    }
+
+
+    /**
+     * Stops OFAgent.
+     * Stops OFAgent for the given virtual network.
+     *
+     * @param stream JSON stream
+     * @return 204 NO CONTENT if OpenFlow agent was stopped, 404 NOT FOUND otherwise
+     * @throws IOException if request cannot be parsed
+     */
+    @POST
+    @Path("ofagent-stop")
+    @Consumes(MediaType.APPLICATION_JSON)
+    public Response stopOFAgent(InputStream stream) throws IOException {
+
+        OFAgentAdminService adminService = get(OFAgentAdminService.class);
+        ObjectNode jsonTree = (ObjectNode) mapper().readTree(stream);
+        JsonNode networkId = jsonTree.get("networkId");
+
+        if (get(OFAgentService.class).agent(NetworkId.networkId(networkId.asLong())) == null) {
+            return Response.status(NOT_FOUND)
+                    .entity(OFAGENT_NOT_FOUND).build();
+        }
+
+        adminService.stopAgent(NetworkId.networkId(networkId.asLong()));
+        return Response.noContent().build();
+    }
+
+
+    /**
+     * Deletes OFAgent.
+     * Removes OFAgent for the given virtual network from repository.
+     *
+     * @param networkId OFAgent networkId
+     * @return 200 OK if OFAgent was removed, 404 NOT FOUND when OF agent does not exist, 400 BAD REQUEST otherwise
+     */
+    @DELETE
+    @Path("ofagent-remove/{networkId}")
+    public Response removeOFAgent(@PathParam("networkId") long networkId) {
+        if (get(OFAgentService.class).agent(NetworkId.networkId(networkId)) == null) {
+            return Response.status(BAD_REQUEST)
+                    .entity(OFAGENT_NOT_FOUND).build();
+        }
+
+        OFAgentAdminService adminService = get(OFAgentAdminService.class);
+        OFAgent removed = adminService.removeAgent(NetworkId.networkId(networkId));
+        if (removed != null) {
+            return Response.ok((new OFAgentCodec()).encode(removed, this), MediaType
+                    .APPLICATION_JSON_TYPE)
+                    .build();
+        } else {
+            return Response.status(NOT_FOUND)
+                    .entity(OFAGENT_NOT_FOUND).build();
+        }
+    }
+}
diff --git a/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/OFControllerCodec.java b/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/OFControllerCodec.java
new file mode 100644
index 0000000..e50dccc
--- /dev/null
+++ b/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/OFControllerCodec.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2017-present 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.ofagent.rest;
+
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.TpPort;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.ofagent.api.OFController;
+import org.onosproject.ofagent.impl.DefaultOFController;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onlab.util.Tools.nullIsIllegal;
+
+/**
+ * OFController JSON codec.
+ */
+public final class OFControllerCodec extends JsonCodec<OFController> {
+
+    private static final String IP = "ip";
+    private static final String PORT = "port";
+
+    private static final String MISSING_MEMBER_MESSAGE = " member is required in OFController";
+
+    @Override
+    public ObjectNode encode(OFController ofController, CodecContext context) {
+        checkNotNull(ofController, "OFController cannot be null");
+
+        return context.mapper().createObjectNode()
+                .put(IP, String.valueOf(ofController.ip()))
+                .put(PORT, String.valueOf(ofController.port()));
+
+    }
+
+    @Override
+    public OFController decode(ObjectNode json, CodecContext context) {
+        if (json == null || !json.isObject()) {
+            return null;
+        }
+
+        // parse ip address
+        int id = nullIsIllegal(json.get(IP), IP + MISSING_MEMBER_MESSAGE).asInt();
+
+        // parse port
+        String name = nullIsIllegal(json.get(PORT), PORT + MISSING_MEMBER_MESSAGE).asText();
+
+        return DefaultOFController.of(IpAddress.valueOf(id),
+                                      TpPort.tpPort(Integer.valueOf(name)));
+    }
+}
diff --git a/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/package-info.java b/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/package-info.java
new file mode 100644
index 0000000..36977f9
--- /dev/null
+++ b/apps/ofagent/src/main/java/org/onosproject/ofagent/rest/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2017-present 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.
+ */
+
+/**
+ * REST API for OFAgent.
+ */
+package org.onosproject.ofagent.rest;
\ No newline at end of file
diff --git a/apps/ofagent/src/main/webapp/WEB-INF/web.xml b/apps/ofagent/src/main/webapp/WEB-INF/web.xml
new file mode 100644
index 0000000..5c82b0d
--- /dev/null
+++ b/apps/ofagent/src/main/webapp/WEB-INF/web.xml
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright 2017-present 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.
+  -->
+<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://java.sun.com/xml/ns/javaee"
+         xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
+         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
+         id="ONOS" version="2.5">
+    <display-name>OFAgent REST API v1.0</display-name>
+
+    <security-constraint>
+        <web-resource-collection>
+            <web-resource-name>Secured</web-resource-name>
+            <url-pattern>/*</url-pattern>
+        </web-resource-collection>
+        <auth-constraint>
+            <role-name>admin</role-name>
+        </auth-constraint>
+    </security-constraint>
+
+    <security-role>
+        <role-name>admin</role-name>
+    </security-role>
+
+    <login-config>
+        <auth-method>BASIC</auth-method>
+        <realm-name>karaf</realm-name>
+    </login-config>
+
+    <servlet>
+        <servlet-name>JAX-RS Service</servlet-name>
+        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
+        <init-param>
+            <param-name>javax.ws.rs.Application</param-name>
+            <param-value>org.onosproject.ofagent.rest.OFAgentWebApplication</param-value>
+        </init-param>
+        <load-on-startup>1</load-on-startup>
+    </servlet>
+
+    <servlet-mapping>
+        <servlet-name>JAX-RS Service</servlet-name>
+        <url-pattern>/*</url-pattern>
+    </servlet-mapping>
+</web-app>