refactor: Optimized the implementation of thread pool

fix: progress bar: wrong index

src/you_get/common.py

@@ -517,60 +517,35 @@ def parallel_in_process(target, params_list, **kwargs):
     return Pool(job).map(lambda_to_function, params_list)
 
 
-def parallel_in_thread(target, params_list, sort, **kwargs):
-    import queue
+def parallel_in_thread(target, params_list, **kwargs):
     from threading import Thread
 
-    tasks = queue.Queue()
-    result = queue.Queue()
+    length = len(params_list)
+    step = (length + job - 1) // job
 
-    for i in (params_list if not sort else enumerate(params_list)):
-        tasks.put(i)
+    result = [None for i in range(length)]
 
-    def action_sort():
-        while not tasks.empty():
-            idx, params = tasks.get(block=False)
+    def do_with_retry(n, act, args):
+        while n >= 0:
             try:
-                result.put((idx, target(*params)))
-            except Exception as e:
-                logging.warn(str(e))
-                tasks.put((idx, params))
+                return act(*args)
+            except:
+                n -= 1
 
-    def action_not_sort():
-        while not tasks.empty():
-            try:
-                params = tasks.get(block=False)
-                result.put(target(*params))
-            except Exception as e:
-                logging.warn(str(e))
-                tasks.put(params)
+    def action(j):
+        for i in range(step * j, min(length, step * (j + 1))):
+            params = params_list[i]
+            result[i] = (do_with_retry(3, target, params))
 
-    def f():
-        try:
-            if sort:
-                action_sort()
-            else:
-                action_not_sort()
-        except queue.Empty:
-            return
-
-    pool = [Thread(target=f) for i in range(job)]
+    pool = [Thread(target=action, args=(i,)) for i in range(job)]
 
     [i.start() for i in pool]
+    [i.join() for i in pool]
 
-    ret = [result.get() for i in range(len(params_list))]
-
-    if not ret:
-        return []
-
-    if sort:
-        ret = sorted(ret)
-        return list(zip(*ret))[1]
-
-    return ret
+    return result
 
 
-def parallel_run(target, params_list, sort_result=False, use_thread=True, **kwargs):
+def parallel_run(target, params_list, use_thread=True, **kwargs):
     if len(params_list) == 0:
         return []
 
@@ -578,7 +553,7 @@ def parallel_run(target, params_list, sort_result=False, use_thread=True, **kwar
         return [target(*i) for i in params_list]
 
     if use_thread:
-        res = parallel_in_thread(target, params_list, sort_result, **kwargs)
+        res = parallel_in_thread(target, params_list, **kwargs)
     else:
         res = parallel_in_process(target, params_list, **kwargs)
     return res
@@ -1078,6 +1053,7 @@ def download_urls(
     else:
         print('Downloading %s ...' % tr(output_filename))
         bar.update()
+        bar.update_piece(0)
 
         params = [[i, url] for i, url in enumerate(urls)]
 
@@ -1085,11 +1061,11 @@ def download_urls(
             output_filename_i = get_output_filename(urls, title, ext, output_dir, merge, part=i)
             output_filepath_i = os.path.join(output_dir, output_filename_i)
             # print 'Downloading %s [%s/%s]...' % (tr(filename), i + 1, len(urls))
-            bar.update_piece()
             url_save(
                 url, output_filepath_i, bar, refer=refer, is_part=True, faker=faker,
                 headers=headers, **kwargs
             )
+            bar.update_piece()
             return output_filepath_i
 
         parts = parallel_run(action, params, True)