Ensure we cannot accidentally open a replay file twice

E.g. from the Replay Viewer while it is still being recovered.
Because that would potentially corrupt it.

src/main/java/com/replaymod/core/files/DelegatingReplayFile.java

@@ -0,0 +1,202 @@
+package com.replaymod.core.files;
+
+import com.replaymod.replaystudio.data.Marker;
+import com.replaymod.replaystudio.data.ModInfo;
+import com.replaymod.replaystudio.data.ReplayAssetEntry;
+import com.replaymod.replaystudio.io.ReplayInputStream;
+import com.replaymod.replaystudio.io.ReplayOutputStream;
+import com.replaymod.replaystudio.lib.guava.base.Optional;
+import com.replaymod.replaystudio.pathing.PathingRegistry;
+import com.replaymod.replaystudio.pathing.path.Timeline;
+import com.replaymod.replaystudio.protocol.PacketTypeRegistry;
+import com.replaymod.replaystudio.replay.ReplayFile;
+import com.replaymod.replaystudio.replay.ReplayMetaData;
+
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.Collection;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+import java.util.regex.Pattern;
+
+public class DelegatingReplayFile implements ReplayFile {
+    private final ReplayFile delegate;
+
+    public DelegatingReplayFile(ReplayFile delegate) {
+        this.delegate = delegate;
+    }
+
+    @Override
+    public Optional<InputStream> get(String entry) throws IOException {
+        return this.delegate.get(entry);
+    }
+
+    @Override
+    public Optional<InputStream> getCache(String entry) throws IOException {
+        return this.delegate.getCache(entry);
+    }
+
+    @Override
+    public Map<String, InputStream> getAll(Pattern pattern) throws IOException {
+        return this.delegate.getAll(pattern);
+    }
+
+    @Override
+    public OutputStream write(String entry) throws IOException {
+        return this.delegate.write(entry);
+    }
+
+    @Override
+    public OutputStream writeCache(String entry) throws IOException {
+        return this.delegate.writeCache(entry);
+    }
+
+    @Override
+    public void remove(String entry) throws IOException {
+        this.delegate.remove(entry);
+    }
+
+    @Override
+    public void removeCache(String entry) throws IOException {
+        this.delegate.removeCache(entry);
+    }
+
+    @Override
+    public void save() throws IOException {
+        this.delegate.save();
+    }
+
+    @Override
+    public void saveTo(File target) throws IOException {
+        this.delegate.saveTo(target);
+    }
+
+    @Override
+    public ReplayMetaData getMetaData() throws IOException {
+        return this.delegate.getMetaData();
+    }
+
+    @Override
+    public void writeMetaData(PacketTypeRegistry registry, ReplayMetaData metaData) throws IOException {
+        this.delegate.writeMetaData(registry, metaData);
+    }
+
+    @Override
+    public ReplayInputStream getPacketData(PacketTypeRegistry registry) throws IOException {
+        return this.delegate.getPacketData(registry);
+    }
+
+    @Override
+    public ReplayOutputStream writePacketData() throws IOException {
+        return this.delegate.writePacketData();
+    }
+
+    @Override
+    public Map<Integer, String> getResourcePackIndex() throws IOException {
+        return this.delegate.getResourcePackIndex();
+    }
+
+    @Override
+    public void writeResourcePackIndex(Map<Integer, String> index) throws IOException {
+        this.delegate.writeResourcePackIndex(index);
+    }
+
+    @Override
+    public Optional<InputStream> getResourcePack(String hash) throws IOException {
+        return this.delegate.getResourcePack(hash);
+    }
+
+    @Override
+    public OutputStream writeResourcePack(String hash) throws IOException {
+        return this.delegate.writeResourcePack(hash);
+    }
+
+    @Override
+    public Map<String, Timeline> getTimelines(PathingRegistry pathingRegistry) throws IOException {
+        return this.delegate.getTimelines(pathingRegistry);
+    }
+
+    @Override
+    public void writeTimelines(PathingRegistry pathingRegistry, Map<String, Timeline> timelines) throws IOException {
+        this.delegate.writeTimelines(pathingRegistry, timelines);
+    }
+
+    @Override
+    public Optional<BufferedImage> getThumb() throws IOException {
+        return this.delegate.getThumb();
+    }
+
+    @Override
+    public void writeThumb(BufferedImage image) throws IOException {
+        this.delegate.writeThumb(image);
+    }
+
+    @Override
+    public Optional<InputStream> getThumbBytes() throws IOException {
+        return this.delegate.getThumbBytes();
+    }
+
+    @Override
+    public void writeThumbBytes(byte[] image) throws IOException {
+        this.delegate.writeThumbBytes(image);
+    }
+
+    @Override
+    public Optional<Set<UUID>> getInvisiblePlayers() throws IOException {
+        return this.delegate.getInvisiblePlayers();
+    }
+
+    @Override
+    public void writeInvisiblePlayers(Set<UUID> uuids) throws IOException {
+        this.delegate.writeInvisiblePlayers(uuids);
+    }
+
+    @Override
+    public Optional<Set<Marker>> getMarkers() throws IOException {
+        return this.delegate.getMarkers();
+    }
+
+    @Override
+    public void writeMarkers(Set<Marker> markers) throws IOException {
+        this.delegate.writeMarkers(markers);
+    }
+
+    @Override
+    public Collection<ReplayAssetEntry> getAssets() throws IOException {
+        return this.delegate.getAssets();
+    }
+
+    @Override
+    public Optional<InputStream> getAsset(UUID uuid) throws IOException {
+        return this.delegate.getAsset(uuid);
+    }
+
+    @Override
+    public OutputStream writeAsset(ReplayAssetEntry asset) throws IOException {
+        return this.delegate.writeAsset(asset);
+    }
+
+    @Override
+    public void removeAsset(UUID uuid) throws IOException {
+        this.delegate.removeAsset(uuid);
+    }
+
+    @Override
+    public Collection<ModInfo> getModInfo() throws IOException {
+        return this.delegate.getModInfo();
+    }
+
+    @Override
+    public void writeModInfo(Collection<ModInfo> modInfo) throws IOException {
+        this.delegate.writeModInfo(modInfo);
+    }
+
+    @Override
+    public void close() throws IOException {
+        this.delegate.close();
+    }
+}

src/main/java/com/replaymod/core/files/ManagedReplayFile.java

@@ -0,0 +1,23 @@
+package com.replaymod.core.files;
+
+import com.replaymod.replaystudio.replay.ReplayFile;
+
+import java.io.IOException;
+
+public class ManagedReplayFile extends DelegatingReplayFile {
+    private Runnable onClose;
+
+    public ManagedReplayFile(ReplayFile delegate, Runnable onClose) {
+        super(delegate);
+
+        this.onClose = onClose;
+    }
+
+    @Override
+    public void close() throws IOException {
+        super.close();
+
+        onClose.run();
+        onClose = () -> {};
+    }
+}

src/main/java/com/replaymod/core/files/ReplayFilesService.java

@@ -17,9 +17,14 @@ import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.SimpleFileVisitor;
 import java.nio.file.attribute.BasicFileAttributes;
+import java.util.Collections;
+import java.util.Objects;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 
 public class ReplayFilesService {
     private final ReplayFoldersService folders;
+    private final Set<Path> lockedPaths = Collections.newSetFromMap(new ConcurrentHashMap<>());
 
     public ReplayFilesService(ReplayFoldersService folders) {
         this.folders = folders;
@@ -30,12 +35,39 @@ public class ReplayFilesService {
     }
 
     public ReplayFile open(Path input, Path output) throws IOException {
-        return new ZipReplayFile(
-                new ReplayStudio(),
-                input != null ? input.toFile() : null,
-                output.toFile(),
-                folders.getCachePathForReplay(output).toFile()
-        );
+        Path realInput = input != null ? input.toAbsolutePath().normalize() : null;
+        Path realOutput = output.toAbsolutePath().normalize();
+
+        if (realInput != null && !lockedPaths.add(realInput)) {
+            throw new FileLockedException(realInput);
+        }
+        if (!Objects.equals(realInput, realOutput) && !lockedPaths.add(realOutput)) {
+            if (realInput != null) {
+                lockedPaths.remove(realInput);
+            }
+            throw new FileLockedException(realOutput);
+        }
+
+        Runnable onClose = () -> {
+            if (realInput != null) {
+                lockedPaths.remove(realInput);
+            }
+            lockedPaths.remove(realOutput);
+        };
+
+        ReplayFile replayFile;
+        try {
+            replayFile = new ZipReplayFile(
+                    new ReplayStudio(),
+                    realInput != null ? realInput.toFile() : null,
+                    realOutput.toFile(),
+                    folders.getCachePathForReplay(realOutput).toFile()
+            );
+        } catch (IOException e) {
+            onClose.run();
+            throw e;
+        }
+        return new ManagedReplayFile(replayFile, onClose);
     }
 
     public void initialScan(ReplayMod core) {
@@ -151,4 +183,10 @@ public class ReplayFilesService {
             e.printStackTrace();
         }
     }
+
+    public static class FileLockedException extends IOException {
+        public FileLockedException(Path path) {
+            super(path.toString());
+        }
+    }
 }