Content handler for python.

examples/python/__mojo__.py

Index: examples/python/__mojo__.py
diff --git a/examples/python/__mojo__.py b/examples/python/__mojo__.py
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+# Copyright 2015 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.
+
+"""Example python application implementing the Echo service."""
+
+import application_mojom
+import shell_mojom
+import service_provider_mojom
+import echo_service_mojom
+
+import mojo.bindings.reflection
+import mojo.system
+
+class ApplicationImpl(application_mojom.Application):
+  def __init__(self):
+    pass
+
+  def Initialize(self, args):
+    pass
+
+  def AcceptConnection(self, requestor_url, provider):
+    # We keep a reference to ServiceProviderImpl to ensure neither it nor
+    # provider gets garbage collected.
+    self._service_provider = ServiceProviderImpl(provider)

[qsr, 2015/01/07 15:14:45]

This is kind of wrong. You must consider that AcceptConnection can be called
multiple time. You should keep a list of provider, and also listen for error on
provider to clean those.

[etiennej, 2015/01/08 11:23:12]

I'll look into it. Note that I am not planning to do a full port of
mojo/public/cpp/application here, but just have enough to demonstrate that
running an application and a service works. A full port may be useful, but
should live in mojo/public/python/application so it could be shared.

+    self._service_provider.AddService("mojo::examples::EchoService",
+                                      PyServiceImpl)
+    provider.client = self._service_provider
+
+
+class ServiceProviderImpl(service_provider_mojom.ServiceProvider):
+  def __init__(self, provider):
+    self._provider = provider
+    self.__name_to_service_connector = {}

[qsr, 2015/01/07 15:14:45]

We do not use double underscore, just use _name_to_service_connector

[etiennej, 2015/01/08 11:23:12]

Done.

+
+  def AddService(self, name, service_class):
+    self.__name_to_service_connector[name] = service_class
+
+  def ConnectToService(self, interface_name, pipe):
+    service = self.__name_to_service_connector[interface_name]

[qsr, 2015/01/07 15:14:45]

You might want to protect all of this with:
if interface_name in self._name_to_service_connector

[etiennej, 2015/01/08 11:23:12]

Done.

+    service.manager.Bind(service(), pipe)
+
+
+class PyServiceImpl(echo_service_mojom.EchoService):
+  def EchoString(self, value):
+    mojo.system.RunLoop.Current().Quit()
+    return value
+
+def MojoMain(shell_handle):
+  """MojoMain is the entry point for a python Mojo module."""
+  loop = mojo.system.RunLoop()
+
+  shell = shell_mojom.Shell.manager.Proxy(mojo.system.Handle(shell_handle))
+  shell.client = ApplicationImpl()
+
+  loop.Run()