Asynchronously fetch preview textures

java.io.FileNotFoundException: minecraft:skins/preview_${profile.getname()}.png

... Seriously?

src/hdskins/java/com/voxelmodpack/hdskins/HDSkinManager.java

@@ -87,7 +87,7 @@ public final class HDSkinManager implements IResourceManagerReloadListener {
     private Class<? extends GuiSkins> skinsClass = null;
 
     public static PreviewTextureManager getPreviewTextureManager(GameProfile profile) {
-        return new PreviewTextureManager(INSTANCE.getGatewayServer().getPreviewTextures(profile));
+        return new PreviewTextureManager(profile);
     }
 
     private HDSkinManager() {

src/hdskins/java/com/voxelmodpack/hdskins/LocalTexture.java

@@ -19,8 +19,8 @@ public class LocalTexture {
 
     private final TextureManager textureManager = Minecraft.getMinecraft().getTextureManager();
 
-    private DynamicTexture local;
-    private PreviewTexture remote;
+    private volatile DynamicTexture local;
+    private volatile PreviewTexture remote;
 
     private ResourceLocation remoteResource;
     private ResourceLocation localResource;
@@ -33,7 +33,7 @@ public class LocalTexture {
         this.blank = blank;
         this.type = type;
 
-        String file =  type.name().toLowerCase() + "s/preview_${profile.getName()}.png";
+        String file = String.format("%ss/preview_%s.png", type.name().toLowerCase(), profile.getName());
 
         remoteResource = new ResourceLocation(file);
         textureManager.deleteTexture(remoteResource);
@@ -76,7 +76,9 @@ public class LocalTexture {
     public void setRemote(PreviewTextureManager ptm, SkinAvailableCallback callback) {
         clearRemote();
 
-        remote = ptm.getPreviewTexture(remoteResource, type, blank.getBlankSkin(type), callback);
+        ptm.getPreviewTexture(remoteResource, type, blank.getBlankSkin(type), callback).thenAccept(texture -> {
+            remote = texture;
+        });
     }
 
     public void setLocal(File file) {

src/hdskins/java/com/voxelmodpack/hdskins/PreviewTextureManager.java

@@ -1,15 +1,17 @@
 package com.voxelmodpack.hdskins;
 
 import com.google.common.collect.Maps;
+import com.mojang.authlib.GameProfile;
 import com.mojang.authlib.minecraft.MinecraftProfileTexture;
 import com.mojang.authlib.minecraft.MinecraftProfileTexture.Type;
+import com.voxelmodpack.hdskins.skins.CallableFutures;
 
-import net.minecraft.client.Minecraft;
 import net.minecraft.client.renderer.IImageBuffer;
 import net.minecraft.client.resources.SkinManager.SkinAvailableCallback;
 import net.minecraft.util.ResourceLocation;
 
 import java.util.Map;
+import java.util.concurrent.CompletableFuture;
 
 import javax.annotation.Nullable;
 
@@ -19,14 +21,26 @@ import javax.annotation.Nullable;
  */
 public class PreviewTextureManager {
 
-    private final Map<Type, MinecraftProfileTexture> textures;
+    private final GameProfile profile;
 
-    PreviewTextureManager(Map<Type, MinecraftProfileTexture> textures) {
-        this.textures = textures;
+    private Map<Type, MinecraftProfileTexture> textures = null;
+
+    PreviewTextureManager(GameProfile profile) {
+        this.profile = profile;
+    }
+
+    public CompletableFuture<PreviewTexture> getPreviewTexture(ResourceLocation location, Type type, ResourceLocation def, @Nullable SkinAvailableCallback callback) {
+        return CallableFutures.asyncFailableFuture(() ->
+            loadPreviewTexture(location, type, def, callback)
+        , HDSkinManager.skinUploadExecutor);
     }
 
     @Nullable
-    public PreviewTexture getPreviewTexture(ResourceLocation location, Type type, ResourceLocation def, @Nullable SkinAvailableCallback callback) {
+    private PreviewTexture loadPreviewTexture(ResourceLocation location, Type type, ResourceLocation def, @Nullable SkinAvailableCallback callback) {
+        if (textures == null) {
+            textures = HDSkinManager.INSTANCE.getGatewayServer().getPreviewTextures(profile);
+        }
+
         if (!textures.containsKey(type)) {
             return null;
         }
@@ -41,7 +55,7 @@ public class PreviewTextureManager {
 
         PreviewTexture skinTexture = new PreviewTexture(texture, def, buffer);
 
-        Minecraft.getMinecraft().getTextureManager().loadTexture(location, skinTexture);
+        TextureLoader.loadTexture(location, skinTexture);
 
         return skinTexture;
     }

src/hdskins/java/com/voxelmodpack/hdskins/skins/CallableFutures.java

@@ -12,6 +12,7 @@ public class CallableFutures {
             try {
                 ret.complete(call.call());
             } catch (Throwable e) {
+                e.printStackTrace();
                 ret.completeExceptionally(e);
             }
         });