Support doccano init on windows

Pipfile

@@ -51,6 +51,7 @@ django-drf-filepond = "*"
 celery = "*"
 django-celery-results = "*"
 sqlalchemy = "*"
+waitress = "*"
 
 [requires]
 python_version = "3.8"

backend/cli.py

@@ -1,12 +1,10 @@
 import argparse
 import multiprocessing
 import os
+import platform
 import subprocess
 import sys
 
-import gunicorn.app.base
-import gunicorn.util
-
 from .app.celery import app
 
 base = os.path.abspath(os.path.dirname(__file__))
@@ -18,21 +16,38 @@ def number_of_workers():
     return (multiprocessing.cpu_count() * 2) + 1
 
 
-class StandaloneApplication(gunicorn.app.base.BaseApplication):
+def run_on_windows(args):
+    import gunicorn.app.base
+    import gunicorn.util
+
+    class StandaloneApplication(gunicorn.app.base.BaseApplication):
+
+        def __init__(self, options=None):
+            self.options = options or {}
+            super().__init__()
+
+        def load_config(self):
+            config = {key: value for key, value in self.options.items()
+                      if key in self.cfg.settings and value is not None}
+            for key, value in config.items():
+                self.cfg.set(key.lower(), value)
+
+        def load(self):
+            sys.path.append(base)
+            return gunicorn.util.import_app('app.wsgi')
 
-    def __init__(self, options=None):
-        self.options = options or {}
-        super().__init__()
+    options = {
+        'bind': '%s:%s' % ('0.0.0.0', args.port),
+        'workers': number_of_workers(),
+        'chdir': base
+    }
+    StandaloneApplication(options).run()
 
-    def load_config(self):
-        config = {key: value for key, value in self.options.items()
-                  if key in self.cfg.settings and value is not None}
-        for key, value in config.items():
-            self.cfg.set(key.lower(), value)
 
-    def load(self):
-        sys.path.append(base)
-        return gunicorn.util.import_app('app.wsgi')
+def run_on_nix(args):
+    from waitress import serve
+    from app.wsgi import application
+    serve(application, port=args.port)
 
 
 def command_db_init(args):
@@ -53,12 +68,10 @@ def command_user_create(args):
 
 def command_run_webserver(args):
     print(f'Starting server with port {args.port}.')
-    options = {
-        'bind': '%s:%s' % ('0.0.0.0', args.port),
-        'workers': number_of_workers(),
-        'chdir': base
-    }
-    StandaloneApplication(options).run()
+    if platform.system() == 'Windows':
+        run_on_windows(args)
+    else:
+        run_on_nix(args)
 
 
 def command_run_task_queue(args):

setup.py

@@ -42,6 +42,7 @@ required = [
     'django-drf-filepond>=0.3.0',
     'sqlalchemy>=1.4.7',
     'gunicorn>=20.1.0',
+    'waitress>=2.0.0',
 ]
 
 setup(