137 lines
4.4 KiB
Java
137 lines
4.4 KiB
Java
/*
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* WorldEdit, a Minecraft world manipulation toolkit
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* Copyright (C) sk89q <http://www.sk89q.com>
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* Copyright (C) WorldEdit team and contributors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package com.sk89q.worldedit.session.storage;
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import com.google.gson.Gson;
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import com.google.gson.GsonBuilder;
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import com.google.gson.JsonIOException;
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import com.google.gson.JsonParseException;
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import com.sk89q.worldedit.LocalSession;
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import com.sk89q.worldedit.internal.util.LogManagerCompat;
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import com.sk89q.worldedit.util.gson.GsonUtil;
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import com.sk89q.worldedit.util.io.Closer;
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import org.apache.logging.log4j.Logger;
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import java.io.BufferedReader;
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import java.io.BufferedWriter;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.FileReader;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.util.UUID;
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import static com.google.common.base.Preconditions.checkNotNull;
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/**
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* Stores sessions as JSON files in a directory.
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*
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* <p>Currently, this implementation doesn't handle thread safety very well.</p>
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*/
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public class JsonFileSessionStore implements SessionStore {
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private static final Logger LOGGER = LogManagerCompat.getLogger();
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private final Gson gson;
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private final File dir;
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/**
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* Create a new session store.
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*
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* @param dir the directory
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*/
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public JsonFileSessionStore(File dir) {
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checkNotNull(dir);
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if (!dir.isDirectory()) {
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if (!dir.mkdirs()) {
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LOGGER.warn("Failed to create directory '" + dir.getPath() + "' for sessions");
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}
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}
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this.dir = dir;
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GsonBuilder builder = GsonUtil.createBuilder();
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gson = builder.create();
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}
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/**
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* Get the path for the given UUID.
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*
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* @param id the ID
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* @return the file
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*/
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private File getPath(UUID id) {
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checkNotNull(id);
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return new File(dir, id + ".json");
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}
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@Override
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public LocalSession load(UUID id) throws IOException {
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File file = getPath(id);
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try (Closer closer = Closer.create()) {
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FileReader fr = closer.register(new FileReader(file));
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BufferedReader br = closer.register(new BufferedReader(fr));
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LocalSession session = gson.fromJson(br, LocalSession.class);
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if (session == null) {
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LOGGER.warn("Loaded a null session from {}, creating new session", file);
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if (!file.delete()) {
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LOGGER.warn("Failed to delete corrupted session {}", file);
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}
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session = new LocalSession();
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}
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return session;
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} catch (JsonParseException e) {
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throw new IOException(e);
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} catch (FileNotFoundException e) {
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return new LocalSession();
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}
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}
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@Override
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public void save(UUID id, LocalSession session) throws IOException {
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checkNotNull(session);
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File finalFile = getPath(id);
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File tempFile = new File(finalFile.getParentFile(), finalFile.getName() + ".tmp");
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try (Closer closer = Closer.create()) {
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FileWriter fr = closer.register(new FileWriter(tempFile));
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BufferedWriter bw = closer.register(new BufferedWriter(fr));
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gson.toJson(session, bw);
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} catch (JsonIOException e) {
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throw new IOException(e);
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}
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if (finalFile.exists()) {
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if (!finalFile.delete()) {
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LOGGER.warn("Failed to delete " + finalFile.getPath() + " so the .tmp file can replace it");
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}
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}
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if (tempFile.length() == 0) {
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throw new IllegalStateException("Gson wrote zero bytes");
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}
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if (!tempFile.renameTo(finalFile)) {
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LOGGER.warn("Failed to rename temporary session file to " + finalFile.getPath());
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}
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}
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}
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