Pepper: PPB_Mojo prototype.

content/browser/renderer_host/pepper/pepper_mojo_host.cc

+// Copyright (c) 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.
+
+#include "content/browser/renderer_host/pepper/pepper_mojo_host.h"
+
+#include "content/public/browser/browser_thread.h"
+#include "ipc/ipc_platform_file.h"
+#include "mojo/embedder/platform_channel_pair.h"
+#include "mojo/examples/echo/echo_service.mojom.h"
+#include "mojo/public/cpp/system/message_pipe.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/ppb_file_io.h"
+#include "ppapi/host/dispatch_host_message.h"
+#include "ppapi/host/ppapi_host.h"
+#include "ppapi/proxy/dispatch_reply_message.h"
+#include "ppapi/proxy/ppapi_messages.h"
+
+namespace content {
+
+namespace {
+base::PlatformFile PlatformFileFromScopedPlatformHandle(
+    mojo::embedder::ScopedPlatformHandle handle) {
+#if defined(OS_POSIX)
+  return handle.release().fd;
+#elif defined(OS_WIN)
+  return handle.release().handle;
+#endif
+}
+
+}  // namespace
+
+
+PepperMojoHost::PepperMojoHost(BrowserPpapiHost* host,
+                               PP_Instance instance,
+                               PP_Resource resource)
+    : ResourceHost(host->GetPpapiHost(), instance, resource),
+      browser_ppapi_host_(host) {
+}
+
+int32_t PepperMojoHost::OnResourceMessageReceived(
+    const IPC::Message& msg,
+    ppapi::host::HostMessageContext* context) {
+  PPAPI_BEGIN_MESSAGE_MAP(PepperMojoHost, msg)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_Mojo_GetHandle,
+                                        OnGetHandle)
+  PPAPI_END_MESSAGE_MAP()
+  return PP_ERROR_FAILED;
+}
+
+class EchoServiceImpl
+    : public mojo::InterfaceImpl<mojo::examples::EchoService> {
+ public:
+  virtual void OnConnectionEstablished() OVERRIDE {
+    LOG(INFO) << "EchoServiceImpl::OnConnectionEstablished()";
+  }
+
+  virtual void OnConnectionError() OVERRIDE {
+    LOG(INFO) << "EchoServiceImpl::OnConnectionError()";
+    fprintf(stderr, "on connection error\n");
+  }
+
+  virtual void EchoString(
+      const mojo::String& value,
+      const mojo::Callback<void(mojo::String)>& cb) OVERRIDE {
+    LOG(INFO) << "Browser EchoString(), value: " << value.get();
+    cb.Run(value);
+  }
+};
+
+void CreateEchoService(
+    mojo::InterfaceRequest<mojo::examples::EchoService> request) {
+  mojo::WeakBindToRequest(new EchoServiceImpl(), &request);
+}
+
+int32_t PepperMojoHost::OnGetHandle(ppapi::host::HostMessageContext* context) {
+  base::ProcessHandle plugin_process_handle =
+      browser_ppapi_host_->GetPluginProcessHandle();
+
+  // No support for in-process.
+  if (base::GetProcId(plugin_process_handle) == base::kNullProcessId) {
+    return PP_ERROR_FAILED;
+  }
+
+  // Note: This code is largely cloned from MojoApplicationHost.
+  mojo::embedder::PlatformChannelPair channel_pair;
+  mojo::ScopedMessagePipeHandle message_pipe = channel_init_.Init(
+      PlatformFileFromScopedPlatformHandle(channel_pair.PassServerHandle()),
+      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
+
+  // TODO(teravest): Support more than one call to GetHandle(); this will
+  // incorrectly bind our service registry to multiple pipes and add services
+  // to it multiple times.
+  service_registry_.BindRemoteServiceProvider(message_pipe.Pass());
+
+  // We use the base class here for calling AddService since
+  // ServiceRegistryImpl hides the base class' AddService() call.
+  ServiceRegistry* sr = &service_registry_;
+  sr->AddService<mojo::examples::EchoService>(base::Bind(&CreateEchoService));
+
+  base::PlatformFile client_file =
+      PlatformFileFromScopedPlatformHandle(channel_pair.PassClientHandle());
+  ppapi::host::ReplyMessageContext reply_context =
+      context->MakeReplyMessageContext();
+
+  ppapi::proxy::SerializedHandle file_handle;
+  int32_t open_flags =  PP_FILEOPENFLAG_READ | PP_FILEOPENFLAG_WRITE;
+
+  file_handle.set_file_handle(
+      IPC::GetFileHandleForProcess(client_file,
+                                   plugin_process_handle,
+                                   true),
+      open_flags,
+      0);
+
+  reply_context.params.AppendHandle(file_handle);
+  host()->SendReply(reply_context, PpapiPluginMsg_Mojo_GetHandleReply());
+
+  return PP_OK_COMPLETIONPENDING;
+}
+
+}  // namespace content