[usb_gadget p07] HTTP management server.

tools/usb_gadget/server.py

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""WSGI application to manage a USB gadget.
+"""
+
+from tornado import httpserver
+from tornado import web
+
+import default_gadget
+
+address = None
+chip = None
+claimed_by = None
+default = default_gadget.DefaultGadget()
+gadget = None
+
+
+def SwitchGadget(new_gadget):
+  if chip.IsConfigured():
+    chip.Destroy()
+
+  global gadget
+  gadget = new_gadget
+  gadget.AddStringDescriptor(3, address)
+  chip.Create(gadget)
+
+
+class ClaimHandler(web.RequestHandler):
+
+  def post(self):
+    global claimed_by
+
+    if claimed_by is None:
+      claimed_by = self.get_argument('session_id')
+    else:
+      self.write('Device is already claimed by "{}".'.format(claimed_by))
+      self.set_status(403)
+
+
+class UnclaimHandler(web.RequestHandler):
+
+  def post(self):
+    global claimed_by
+    claimed_by = None
+    if gadget != default:
+      SwitchGadget(default)
+
+
+class UnconfigureHandler(web.RequestHandler):
+
+  def post(self):
+    SwitchGadget(default)
+
+
+class DisconnectHandler(web.RequestHandler):
+
+  def post(self):
+    if chip.IsConfigured():
+      chip.Destroy()
+
+
+class ReconnectHandler(web.RequestHandler):
+
+  def post(self):
+    if not chip.IsConfigured():
+      chip.Create(gadget)
+
+
+app = web.Application([
+    (r'/claim', ClaimHandler),
+    (r'/unclaim', UnclaimHandler),
+    (r'/unconfigure', UnconfigureHandler),
+    (r'/disconnect', DisconnectHandler),
+    (r'/reconnect', ReconnectHandler),
+])
+
+http_server = httpserver.HTTPServer(app)