com.gluonhq.impl.connect.gluoncloud.GluonCloudUpdateFieldReader Maven / Gradle / Ivy

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/**
 * Copyright (c) 2016 Gluon
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *     * Neither the name of Gluon, any associated website, nor the
 * names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL GLUON BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.gluonhq.impl.connect.gluoncloud;

import com.gluonhq.charm.down.Services;
import com.gluonhq.charm.down.plugins.StorageService;
import com.gluonhq.connect.GluonObservableObject;
import com.gluonhq.connect.gluoncloud.GluonClient;
import com.gluonhq.connect.provider.ObjectDataReader;
import com.gluonhq.connect.source.FileDataSource;
import com.gluonhq.connect.source.IODataSource;
import com.gluonhq.connect.source.RestDataSource;
import com.gluonhq.impl.connect.gluoncloud.metadata.ConnectMetadata;
import com.gluonhq.impl.connect.gluoncloud.metadata.SerializationUtils;

import javax.json.Json;
import javax.json.JsonArray;
import javax.json.JsonArrayBuilder;
import javax.json.JsonBuilderFactory;
import javax.json.JsonObject;
import javax.json.JsonReader;
import javax.json.JsonReaderFactory;
import javax.json.JsonWriter;
import javax.json.JsonWriterFactory;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.logging.Level;
import java.util.logging.Logger;

public class GluonCloudUpdateFieldReader implements ObjectDataReader {

    private static final Logger LOGGER = Logger.getLogger(GluonCloudUpdateFieldReader.class.getName());

    private static final JsonBuilderFactory builderFactory = Json.createBuilderFactory(null);
    private static final JsonReaderFactory readerFactory = Json.createReaderFactory(null);
    private static final JsonWriterFactory writerFactory = Json.createWriterFactory(null);

    private static File privateStorage;
    static {
        try {
            privateStorage = Services.get(StorageService.class)
                    .flatMap(StorageService::getPrivateStorage)
                    .orElseThrow(() -> new IllegalAccessException());
        } catch (IllegalAccessException ex) {
            LOGGER.log(Level.SEVERE, "Could not get private storage from device.", ex);
        }
    }

    private final GluonClient gluonClient;

    private final String fieldName;
    private final T object;
    private final String objectIdentifier;
    private final String listIdentifier;
    private final ConnectMetadata metadata;

    private final IODataSource dataSource;

    public GluonCloudUpdateFieldReader(String fieldName, GluonObservableObjectImpl object) {
        this.fieldName = fieldName;
        this.gluonClient = object.getGluonClient();
        this.objectIdentifier = object.getIdentifier();
        this.object = object.get();
        this.listIdentifier = null;
        this.metadata = object.getMetadata();

        dataSource = createDataSource();
    }

    public GluonCloudUpdateFieldReader(String fieldName, GluonObservableListImpl list, T object, String objectIdentifier) {
        this.fieldName = fieldName;
        this.gluonClient = list.getGluonClient();
        this.objectIdentifier = objectIdentifier;
        this.object = object;
        this.listIdentifier = list.getIdentifier();
        this.metadata = list.getMetadata();

        dataSource = createDataSource();
    }

    @Override
    public GluonObservableObject newGluonObservableObject() {
        return new GluonObservableObject<>();
    }

    private IODataSource createDataSource() {
        switch (gluonClient.getOperationMode()) {
            case CLOUD_FIRST:
                return createRestDataSource();
            case LOCAL_ONLY:
                return createLocalDataSource();
        }
        return null;
    }

    private IODataSource createRestDataSource() {
        RestDataSource restDataSource = new RestDataSource();

        restDataSource.setHost(gluonClient.getHost("data"));

        restDataSource.setConsumerKey(gluonClient.getCredentials().getKey());
        restDataSource.setConsumerSecret(gluonClient.getCredentials().getSecret());

        restDataSource.setMethod("POST");

        restDataSource.setPath("/client/updateField");

        String fieldIdentifier = objectIdentifier + "/" + fieldName;
        restDataSource.addFormParam("identifier", fieldIdentifier);
        restDataSource.addFormParam("objectIdentifier", objectIdentifier);
        if (listIdentifier != null) {
            restDataSource.addFormParam("listIdentifier", listIdentifier);
        }
        restDataSource.addFormParam("target", SerializationUtils.serializeToString(metadata.serializeField(fieldName, object)));

        restDataSource.addQueryParam("accept-encoding", "gzip");

        return restDataSource;
    }

    private IODataSource createLocalDataSource() {
        if (listIdentifier != null) {
            File listContent = new File(privateStorage, listIdentifier);
            if (listContent.exists()) {
                return new FileDataSource(listContent);
            }
        } else {
            File objectContent = new File(privateStorage, objectIdentifier);
            if (objectContent.exists()) {
                return new FileDataSource(objectContent);
            }
        }

        return null;
    }

    @Override
    public Void readObject() {
        switch (gluonClient.getOperationMode()) {
            case CLOUD_FIRST:
                try (InputStream input = dataSource.getInputStream()) {
                    LOGGER.log(Level.FINE, "Ignoring response from input source.");
                } catch (IOException ex) {
                    LOGGER.log(Level.WARNING, "Exception while reading input stream.", ex);
                }
                break;
            case LOCAL_ONLY:
                if (dataSource != null) {
                    if (listIdentifier != null) {
                        JsonArrayBuilder newItemsArray = builderFactory.createArrayBuilder();

                        try (JsonReader reader = readerFactory.createReader(new InputStreamReader(dataSource.getInputStream(), "UTF-8"))) {
                            JsonObject listObject = reader.readObject();
                            JsonArray itemsArray = listObject.getJsonArray(DataSkel.PROTOCOL_KEY_PAYLOAD);
                            if (itemsArray != null) {
                                for (JsonObject candidate : itemsArray.getValuesAs(JsonObject.class)) {
                                    if (candidate.getString(DataSkel.PROTOCOL_KEY_UID).equals(objectIdentifier)) {
                                        newItemsArray.add(builderFactory.createObjectBuilder().add(DataSkel.PROTOCOL_KEY_UID, objectIdentifier).add(DataSkel.PROTOCOL_KEY_PAYLOAD, SerializationUtils.serializeToString(metadata.serialize(object))));
                                    } else {
                                        newItemsArray.add(candidate);
                                    }
                                }
                            }
                        } catch (IOException ex) {
                            LOGGER.log(Level.WARNING, "Exception while reading input stream.", ex);
                        }

                        try (JsonWriter writer = writerFactory.createWriter(new OutputStreamWriter(dataSource.getOutputStream(), "UTF-8"))) {
                            writer.write(builderFactory.createObjectBuilder().add(DataSkel.PROTOCOL_KEY_PAYLOAD, newItemsArray).build());
                        } catch (IOException ex) {
                            LOGGER.log(Level.WARNING, "Exception while writing output stream.", ex);
                        }
                    } else {
                        JsonObject toStore = Json.createObjectBuilder()
                                .add(DataSkel.PROTOCOL_KEY_PAYLOAD, SerializationUtils.serializeToString(metadata.serialize(object)))
                                .add(DataSkel.PROTOCOL_KEY_UID, objectIdentifier)
                                .build();
                        try (JsonWriter writer = writerFactory.createWriter(new OutputStreamWriter(dataSource.getOutputStream(), "UTF-8"))) {
                            writer.write(toStore);
                        } catch (IOException ex) {
                            LOGGER.log(Level.WARNING, "Exception while writing output stream.", ex);
                        }
                    }
                }
                break;
        }
        return null;
    }
}