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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.escape.verify.service;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import javax.ws.rs.InternalServerErrorException;
import com.fasterxml.jackson.databind.JsonNode;
import com.github.fge.jsonschema.core.exceptions.ProcessingException;
import com.github.fge.jsonschema.main.JsonSchema;
import it.polito.escape.verify.database.DatabaseClass;
import it.polito.escape.verify.exception.BadRequestException;
import it.polito.escape.verify.exception.DataNotFoundException;
import it.polito.escape.verify.exception.ForbiddenException;
import it.polito.escape.verify.model.Configuration;
import it.polito.escape.verify.model.Graph;
import it.polito.escape.verify.model.Neighbour;
import it.polito.escape.verify.model.Node;
public class NodeService {
private Map<Long, Graph> graphs = DatabaseClass.getInstance().getGraphs();
public NodeService() {
}
public List<Node> getAllNodes(long graphId) {
if (graphId <= 0) {
throw new ForbiddenException("Illegal graph id: " + graphId);
}
Graph graph = graphs.get(graphId);
if (graph == null)
throw new DataNotFoundException("Graph with id " + graphId + " not found");
Map<Long, Node> nodes = graph.getNodes();
return new ArrayList<Node>(nodes.values());
}
public Node getNode(long graphId, long nodeId) {
if (graphId <= 0) {
throw new ForbiddenException("Illegal graph id: " + graphId);
}
if (nodeId <= 0) {
throw new ForbiddenException("Illegal node id: " + nodeId);
}
Graph graph = graphs.get(graphId);
if (graph == null)
throw new DataNotFoundException("Graph with id " + graphId + " not found");
Map<Long, Node> nodes = graph.getNodes();
Node node = nodes.get(nodeId);
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) {
if (graphId <= 0) {
throw new ForbiddenException("Illegal graph id: " + graphId);
}
if (node.getId() <= 0) {
throw new ForbiddenException("Illegal node id: " + node.getId());
}
Graph graph = graphs.get(graphId);
if (graph == null)
throw new DataNotFoundException("Graph with id " + graphId + " not found");
Map<Long, Node> nodes = graph.getNodes();
Node localNode = nodes.get(node.getId());
if (localNode == null) {
throw new DataNotFoundException("Node with id " + node.getId() + " not found in graph with id " + graphId);
}
Graph graphCopy = new Graph();
graphCopy.setId(graph.getId());
graphCopy.setNodes(new HashMap<Long, Node>(graph.getNodes()));
graphCopy.getNodes().remove(node.getId());
// int numberOfNeighbours = 0;
// for(Neighbour neighbour : node.getNeighbours().values()){
// neighbour.setId(++numberOfNeighbours);
// }
for (Map.Entry<Long, Neighbour> neighbourEntry : node.getNeighbours().entrySet()) {
neighbourEntry.getValue().setId(neighbourEntry.getKey());
}
validateNode(graphCopy, node);
synchronized (this) {
nodes.put(node.getId(), node);
DatabaseClass.persistDatabase();
return node;
}
}
public Node removeNode(long graphId, long nodeId) {
if (graphId <= 0) {
throw new ForbiddenException("Illegal graph id: " + graphId);
}
if (nodeId <= 0) {
throw new ForbiddenException("Illegal node id: " + nodeId);
}
Graph graph = graphs.get(graphId);
if (graph == null)
throw new DataNotFoundException("Graph with id " + graphId + " not found");
Map<Long, Node> nodes = graph.getNodes();
synchronized (this) {
return nodes.remove(nodeId);
}
}
public Node addNode(long graphId, Node node) {
if (graphId <= 0) {
throw new ForbiddenException("Illegal graph id: " + graphId);
}
Graph graph = graphs.get(graphId);
if (graph == null)
throw new DataNotFoundException("Graph with id " + graphId + " not found");
Map<Long, Node> nodes = graph.getNodes();
validateNode(graph, node);
synchronized (this) {
node.setId(DatabaseClass.getInstance().getGraphNumberOfNodes(graphId) + 1);
}
// int numberOfNeighbours = 0;
for (Map.Entry<Long, Neighbour> neighbourEntry : node.getNeighbours().entrySet()) {
neighbourEntry.getValue().setId(neighbourEntry.getKey());
}
// for (Neighbour neighbour : node.getNeighbours().values()) {
// neighbour.setId(++numberOfNeighbours);
// }
synchronized (this) {
nodes.put(node.getId(), node);
DatabaseClass.persistDatabase();
return node;
}
}
public Node searchByName(long graphId, String nodeName) {
if (graphId <= 0) {
throw new ForbiddenException("Illegal graph id: " + graphId);
}
Graph graph = graphs.get(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) {
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/verify/json/" + schemaFileName);
if (!schemaFile.exists()) {
//if no REST client, try gRPC application
schemaFile = new File("src/main/webapp/json/" + 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());
}
}
}
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