Break up large function.

model_filemanager/download_models.py

@@ -1,9 +1,9 @@
 import aiohttp
 import os
 from folder_paths import models_dir
-from typing import Callable, Any
+from typing import Callable, Any, Optional
 from enum import Enum
-
+import time
 from dataclasses import dataclass
 
 class DownloadStatusType(Enum):
@@ -14,65 +14,101 @@ class DownloadStatusType(Enum):
 
 @dataclass
 class DownloadStatus():
-    status: DownloadStatusType
+    status: str
     progress_percentage: float
     message: str
 
+    def __init__(self, status: DownloadStatusType, progress_percentage: float, message: str):
+        self.status = status.value  # Store the string value of the Enum
+        self.progress_percentage = progress_percentage
+        self.message = message
+
 @dataclass
 class DownloadModelResult():
-    status: DownloadStatusType
+    status: str
     message: str
     already_existed: bool
 
+    def __init__(self, status: DownloadStatusType, message: str, already_existed: bool):
+        self.status = status.value  # Store the string value of the Enum
+        self.message = message
+        self.already_existed = already_existed
+
 async def download_model(session: aiohttp.ClientSession, 
                          model_name: str,  
                          model_url: str, 
                          model_directory: str, 
                          progress_callback: Callable[[str, DownloadStatus], Any]) -> DownloadModelResult:
-    """
-    Asynchronously downloads a model file from a given URL to a specified directory.
+    file_path, relative_path = create_model_path(model_name, model_directory)
     
-    If the file already exists, return success.
-    Downloads the file in chunks and reports progress as a percentage through the callback function.
-    """
+    existing_file = await check_file_exists(file_path, model_name, progress_callback, relative_path)
+    if existing_file:
+        return existing_file
 
-    full_model_dir = os.path.join(models_dir, model_directory)
-    os.makedirs(full_model_dir, exist_ok=True) # Ensure the directory exists.
-    file_path = os.path.join(full_model_dir, model_name)
-    relative_path = '/'.join([model_directory, model_name])
-    if os.path.exists(file_path):
-        status = DownloadStatus(DownloadStatusType.COMPLETED, 100, f"{model_name} already exists")
-        await progress_callback(relative_path, status)
-        return {"status": DownloadStatusType.COMPLETED, "message": f"{model_name} already exists", "already_existed": True}
     try:
         status = DownloadStatus(DownloadStatusType.PENDING, 0, f"Starting download of {model_name}")
         await progress_callback(relative_path, status)
 
-        async with session.get(model_url) as response:
+        response = await session.get(model_url)
+        
         if response.status != 200:
             error_message = f"Failed to download {model_name}. Status code: {response.status}"
             status = DownloadStatus(DownloadStatusType.ERROR, 0, error_message)
             await progress_callback(relative_path, status)
-                return {"status": DownloadStatusType.ERROR, "message": f"Failed to download {model_name}. Status code: {response.status} ", "already_existed": False}
+            return DownloadModelResult(DownloadStatusType.ERROR, error_message, False)
 
+        return await track_download_progress(response, file_path, model_name, progress_callback, relative_path)
+
+    except Exception as e:
+        return await handle_download_error(e, model_name, progress_callback, relative_path)
+    
+
+def create_model_path(model_name: str, model_directory: str) -> tuple[str, str]:
+    full_model_dir = os.path.join(models_dir, model_directory)
+    os.makedirs(full_model_dir, exist_ok=True)
+    file_path = os.path.join(full_model_dir, model_name)
+    relative_path = '/'.join([model_directory, model_name])
+    return file_path, relative_path
+
+async def check_file_exists(file_path: str, model_name: str, progress_callback: Callable[[str, DownloadStatus], Any], relative_path: str) -> Optional[DownloadModelResult]:
+    if os.path.exists(file_path):
+        status = DownloadStatus(DownloadStatusType.COMPLETED, 100, f"{model_name} already exists")
+        await progress_callback(relative_path, status)
+        return DownloadModelResult(DownloadStatusType.COMPLETED, f"{model_name} already exists", True)
+    return None
+
+
+async def track_download_progress(response: aiohttp.ClientResponse, file_path: str, model_name: str, progress_callback: Callable[[str, DownloadStatus], Any], relative_path: str, interval: float = 1.0) -> DownloadModelResult:
     total_size = int(response.headers.get('Content-Length', 0))
     downloaded = 0
+    last_update_time = time.time()
+
+    async def update_progress():
+        nonlocal last_update_time
+        progress = (downloaded / total_size) * 100 if total_size > 0 else 0
+        status = DownloadStatus(DownloadStatusType.IN_PROGRESS, progress, f"Downloading {model_name}")
+        await progress_callback(relative_path, status)
+        last_update_time = time.time()
 
     with open(file_path, 'wb') as f:
         async for chunk in response.content.iter_chunked(8192):
             f.write(chunk)
             downloaded += len(chunk)
-                    progress = (downloaded / total_size) * 100 if total_size > 0 else 0
-                    status = DownloadStatus(DownloadStatusType.IN_PROGRESS, progress, f"Downloading {model_name}")
-                    await progress_callback(relative_path, status)
+            
+            # Check if it's time to update progress
+            if time.time() - last_update_time >= interval:
+                await update_progress()
+
+    # Ensure we send a final update
+    await update_progress()
 
     status = DownloadStatus(DownloadStatusType.COMPLETED, 100, f"Successfully downloaded {model_name}")
     await progress_callback(relative_path, status)
 
-        return {"status": DownloadStatusType.COMPLETED, "message": f"Successfully downloaded {model_name}", "already_existed": False}
+    return DownloadModelResult(DownloadStatusType.COMPLETED, f"Successfully downloaded {model_name}", False)
 
-    except Exception as e:
+async def handle_download_error(e: Exception, model_name: str, progress_callback: Callable[[str, DownloadStatus], Any], relative_path: str) -> DownloadModelResult:
     error_message = f"Error downloading {model_name}: {str(e)}"
     status = DownloadStatus(DownloadStatusType.ERROR, 0, error_message)
     await progress_callback(relative_path, status)
-        return {"status": DownloadStatusType.ERROR, "message": error_message, "already_existed": False}
+    return DownloadModelResult(DownloadStatusType.ERROR, error_message, False)