process silence with processes instead of threads

- might help memory issues?
+ fix double slash problem on windows?

app/api/folder.py

@@ -99,11 +99,12 @@ def get_folder_tree(body: FolderTree):
     if is_windows():
         # Trailing slash needed when drive letters are passed,
         # Remember, the trailing slash is removed in the client.
-        req_dir += "/"
+        # req_dir += "/"
+        pass
     else:
         req_dir = "/" + req_dir if not req_dir.startswith("/") else req_dir
 
-    res = get_files_and_dirs(
+    return get_files_and_dirs(
         req_dir,
         start=body.start,
         limit=body.limit,
@@ -114,8 +115,6 @@ def get_folder_tree(body: FolderTree):
         foldersort_reverse=body.foldersort_reverse,
     )
 
-    return res
-
 
 def get_all_drives(is_win: bool = False):
     """

app/lib/trackslib.py

@@ -6,7 +6,7 @@ import os
 
 from app.lib.pydub.pydub import AudioSegment
 from app.lib.pydub.pydub.silence import detect_leading_silence, detect_silence
-from app.utils.threading import ThreadWithReturnValue
+from app.utils.threading import ProcessWithReturnValue
 
 
 def get_leading_silence_end(filepath: str):
@@ -58,13 +58,13 @@ def get_silence_paddings(ending_file: str, starting_file: str):
     starting_thread = None
 
     if os.path.exists(ending_file):
-        ending_thread = ThreadWithReturnValue(
+        ending_thread = ProcessWithReturnValue(
             target=get_trailing_silence_start, args=(ending_file,)
         )
         ending_thread.start()
 
     if os.path.exists(starting_file):
-        starting_thread = ThreadWithReturnValue(
+        starting_thread = ProcessWithReturnValue(
             target=get_leading_silence_end, args=(starting_file,)
         )
         starting_thread.start()

app/utils/threading.py

@@ -1,4 +1,5 @@
 import threading
+from multiprocessing import Process, Pipe
 
 
 def background(func):
@@ -12,23 +13,30 @@ def background(func):
     return background_func
 
 
-class ThreadWithReturnValue(threading.Thread):
-    """
-    A thread class that returns a value on join.
 
-    Credit: https://stackoverflow.com/a/6894023
+class ProcessWithReturnValue(Process):
+    """
+    A process class that returns a value on join.
+    Uses a pipe to communicate the return value back to the parent process.
     """
 
     def __init__(
         self, group=None, target=None, name=None, args=(), kwargs={}, Verbose=None
     ):
-        threading.Thread.__init__(self, group, target, name, args, kwargs)
+        Process.__init__(self, group=group, target=target, name=name, args=args, kwargs=kwargs)
-        self._return = None
+        self._parent_conn, self._child_conn = Pipe()
+        self._target = target
+        self._args = args
+        self._kwargs = kwargs
 
     def run(self):
         if self._target is not None:
-            self._return = self._target(*self._args, **self._kwargs)
+            result = self._target(*self._args, **self._kwargs)
+            self._child_conn.send(result)
+        self._child_conn.close()
 
     def join(self, *args):
-        threading.Thread.join(self, *args)
+        Process.join(self, *args)
-        return self._return
+        if self._parent_conn.poll():
+            return self._parent_conn.recv()
+        return None