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/*******************************************************************************
* Copyright (c) 2017 Politecnico di Torino and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Apache License, Version 2.0
* which accompanies this distribution, and is available at
* http://www.apache.org/licenses/LICENSE-2.0
*******************************************************************************/
package it.polito.verigraph.service;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.ws.rs.InternalServerErrorException;
import javax.xml.bind.JAXBException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.github.fge.jsonschema.core.exceptions.ProcessingException;
import com.github.fge.jsonschema.main.JsonSchema;
import it.polito.neo4j.exceptions.MyInvalidIdException;
import it.polito.neo4j.exceptions.MyNotFoundException;
import it.polito.neo4j.manager.Neo4jDBManager;
import it.polito.verigraph.exception.BadRequestException;
import it.polito.verigraph.exception.DataNotFoundException;
import it.polito.verigraph.exception.ForbiddenException;
import it.polito.verigraph.model.Configuration;
import it.polito.verigraph.model.Graph;
import it.polito.verigraph.model.Neighbour;
import it.polito.verigraph.model.Node;
public class NodeService {
private Neo4jDBManager manager=new Neo4jDBManager();
public NodeService() {}
public List<Node> getAllNodes(long graphId) throws JsonParseException, JsonMappingException, JAXBException, IOException, MyNotFoundException {
if (graphId < 0) {
throw new ForbiddenException("Illegal graph id: " + graphId);
}
/*il controllo sull'esistenza del grafo viene fatto all'interno della getNodes
*/
Map<Long, Node> nodes =manager.getNodes(graphId);
return new ArrayList<Node>(nodes.values());
}
public Node getNode(long graphId, long nodeId) throws JsonParseException, JsonMappingException, JAXBException, IOException, MyNotFoundException {
if (graphId < 0) {
throw new ForbiddenException("Illegal graph id: " + graphId);
}
if (nodeId < 0) {
throw new ForbiddenException("Illegal node id: " + nodeId);
}
Node node=manager.getNodeById(nodeId, graphId);
if (node == null) {
throw new DataNotFoundException("Node with id " + nodeId + " not found in graph with id " + graphId);
}
return node;
}
public Node updateNode(long graphId, Node node) throws JAXBException, IOException, MyInvalidIdException {
if (graphId < 0) {
throw new ForbiddenException("Illegal graph id: " + graphId);
}
if (node.getId() < 0) {
throw new ForbiddenException("Illegal node id: " + node.getId());
}
Graph graph=manager.getGraph(graphId);
validateNode(graph, node);
Node n=manager.updateNode(graphId, node, node.getId());
validateNode(graph, n);
return n;
}
public Node removeNode(long graphId, long nodeId) throws JsonParseException, JsonMappingException, JAXBException, IOException {
if (graphId < 0) {
throw new ForbiddenException("Illegal graph id: " + graphId);
}
if (nodeId < 0) {
throw new ForbiddenException("Illegal node id: " + nodeId);
}
Graph graph=manager.getGraph(graphId);
if (graph == null)
throw new DataNotFoundException("Graph with id " + graphId + " not found");
Node n=manager.deleteNode(graphId, nodeId);
return n;
}
public Node addNode(long graphId, Node node) throws JsonParseException, JsonMappingException, JAXBException, IOException, MyInvalidIdException {
if (graphId < 0) {
throw new ForbiddenException("Illegal graph id: " + graphId);
}
Graph graph=manager.getGraph(graphId);
validateNode(graph, node);
Node n=manager.addNode(graphId, node);
validateNode(graph, n);
return n;
}
public Node searchByName(long graphId, String nodeName) throws JsonParseException, JsonMappingException, JAXBException, IOException {
if (graphId < 0) {
throw new ForbiddenException("Illegal graph id: " + graphId);
}
Graph graph = manager.getGraph(graphId);
if (graph == null)
throw new DataNotFoundException("Graph with id " + graphId + " not found");
Map<Long, Node> nodes = graph.getNodes();
for (Node node : nodes.values()) {
if (node.getName().equals(nodeName))
return node;
}
return null;
}
public static void validateNode(Graph graph, Node node) throws JsonProcessingException {
if (graph == null)
throw new BadRequestException("Node validation failed: cannot validate null graph");
if (node == null)
throw new BadRequestException("Node validation failed: cannot validate null node");
if (node.getName() == null)
throw new BadRequestException("Node validation failed: node 'name' field cannot be null");
if (node.getFunctional_type() == null)
throw new BadRequestException("Node validation failed: node 'functional_type' field cannot be null");
if (node.getName().equals(""))
throw new BadRequestException("Node validation failed: node 'name' field cannot be an empty string");
if (node.getFunctional_type().equals(""))
throw new BadRequestException("Node validation failed: node 'functional_type' field cannot be an empty string");
Node nodeFound =graph.searchNodeByName(node.getName());
if ((nodeFound != null) && (nodeFound.equals(node) == false))
throw new BadRequestException("Node validation failed: graph already has a node named '"+ node.getName()
+ "'");
Configuration configuration = node.getConfiguration();
if (configuration != null) {
JsonNode configurationJsonNode = configuration.getConfiguration();
// validate configuration against schema file
validateNodeConfigurationAgainstSchemaFile(node, configurationJsonNode);
JsonValidationService jsonValidator = new JsonValidationService(graph, node);
boolean hasCustomValidator = jsonValidator.validateNodeConfiguration();
if (!hasCustomValidator) {
jsonValidator.validateFieldsAgainstNodeNames(configurationJsonNode);
}
}
// validate neighbours
Map<Long, Neighbour> nodeNeighboursMap = node.getNeighbours();
if (nodeNeighboursMap == null)
throw new BadRequestException("Node validation failed: node 'neighbours' cannot be null");
for (Neighbour neighbour : nodeNeighboursMap.values()) {
NeighbourService.validateNeighbour(graph, node, neighbour);
}
}
public static void validateNodeConfigurationAgainstSchemaFile(Node node, JsonNode configurationJson) {
String schemaFileName = node.getFunctional_type() + ".json";
File schemaFile = new File(System.getProperty("catalina.base") + "/webapps/verigraph/jsonschema/" + schemaFileName);
if (!schemaFile.exists()) {
//if no REST client, try gRPC application
schemaFile = new File(System.getProperty("user.dir") + "/jsonschema/" + schemaFileName);
if (!schemaFile.exists()) {
throw new ForbiddenException("Functional type '"+ node.getFunctional_type()
+ "' is not supported! Please edit 'functional_type' field of node '"
+ node.getName() + "'");
}
}
JsonSchema schemaNode = null;
try {
schemaNode = ValidationUtils.getSchemaNode(schemaFile);
}
catch (IOException e) {
throw new InternalServerErrorException("Unable to load '" + schemaFileName + "' schema file");
}
catch (ProcessingException e) {
throw new InternalServerErrorException("Unable to resolve '"+ schemaFileName
+ "' schema file as a schema node");
}
try {
ValidationUtils.validateJson(schemaNode, configurationJson);
}
catch (ProcessingException e) {
throw new BadRequestException("Something went wrong trying to validate node '"+ node.getName()
+ "' with the following configuration: '" + configurationJson.toString()
+ "' against the json schema '" + schemaFile.getName() + "': "
+ e.getMessage());
}
}
public Configuration addNodeConfiguration(long graphId, long nodeId, Configuration nodeConfiguration) throws IOException, MyInvalidIdException {
if (graphId < 0) {
throw new ForbiddenException("Illegal graph id: " + graphId);
}
if (nodeId < 0) {
throw new ForbiddenException("Illegal node id: " + nodeId);
}
Node node=manager.getNodeById(nodeId, graphId);
validateNodeConfigurationAgainstSchemaFile(node, nodeConfiguration.getConfiguration());
Configuration newConf=manager.updateConfiguration(nodeId, graphId, nodeConfiguration, node);
return newConf;
}
}
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