content/worker/websharedworker_stub.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/worker/websharedworker_stub.h"
   6
   7 #include "base/compiler_specific.h"
   8 #include "content/child/child_process.h"
   9 #include "content/child/child_thread.h"
  10 #include "content/child/fileapi/file_system_dispatcher.h"
  11 #include "content/child/webmessageportchannel_impl.h"
  12 #include "content/common/worker_messages.h"
  13 #include "content/worker/shared_worker_devtools_agent.h"
  14 #include "content/worker/worker_thread.h"
  15 #include "third_party/WebKit/public/web/WebSharedWorker.h"
  16 #include "third_party/WebKit/public/platform/WebString.h"
  17 #include "third_party/WebKit/public/platform/WebURL.h"
  18
  19 namespace content {
  20
  21 WebSharedWorkerStub::WebSharedWorkerStub(
  22     const string16& name,
  23     int route_id,
  24     const WorkerAppCacheInitInfo& appcache_init_info)
  25     : route_id_(route_id),
  26       appcache_init_info_(appcache_init_info),
  27       client_(route_id, this),
  28       name_(name),
  29       started_(false) {
  30
  31   WorkerThread* worker_thread = WorkerThread::current();
  32   DCHECK(worker_thread);
  33   worker_thread->AddWorkerStub(this);
  34   // Start processing incoming IPCs for this worker.
  35   worker_thread->AddRoute(route_id_, this);
  36   ChildProcess::current()->AddRefProcess();
  37
  38   // TODO(atwilson): Add support for NaCl when they support MessagePorts.
  39   impl_ = WebKit::WebSharedWorker::create(client());
  40   worker_devtools_agent_.reset(new SharedWorkerDevToolsAgent(route_id, impl_));
  41   client()->set_devtools_agent(worker_devtools_agent_.get());
  42 }
  43
  44 WebSharedWorkerStub::~WebSharedWorkerStub() {
  45   impl_->clientDestroyed();
  46   WorkerThread* worker_thread = WorkerThread::current();
  47   DCHECK(worker_thread);
  48   worker_thread->RemoveWorkerStub(this);
  49   worker_thread->RemoveRoute(route_id_);
  50   ChildProcess::current()->ReleaseProcess();
  51 }
  52
  53 void WebSharedWorkerStub::Shutdown() {
  54   // The worker has exited - free ourselves and the client.
  55   delete this;
  56 }
  57
  58 void WebSharedWorkerStub::EnsureWorkerContextTerminates() {
  59   client_.EnsureWorkerContextTerminates();
  60 }
  61
  62 bool WebSharedWorkerStub::OnMessageReceived(const IPC::Message& message) {
  63   if (worker_devtools_agent_->OnMessageReceived(message))
  64     return true;
  65
  66   bool handled = true;
  67   IPC_BEGIN_MESSAGE_MAP(WebSharedWorkerStub, message)
  68     IPC_MESSAGE_HANDLER(WorkerMsg_StartWorkerContext, OnStartWorkerContext)
  69     IPC_MESSAGE_HANDLER(WorkerMsg_TerminateWorkerContext,
  70                         OnTerminateWorkerContext)
  71     IPC_MESSAGE_HANDLER(WorkerMsg_Connect, OnConnect)
  72     IPC_MESSAGE_UNHANDLED(handled = false)
  73   IPC_END_MESSAGE_MAP()
  74   return handled;
  75 }
  76
  77 void WebSharedWorkerStub::OnChannelError() {
  78     OnTerminateWorkerContext();
  79 }
  80
  81 const GURL& WebSharedWorkerStub::url() {
  82   return url_;
  83 }
  84
  85 void WebSharedWorkerStub::OnStartWorkerContext(
  86     const GURL& url, const string16& user_agent, const string16& source_code,
  87     const string16& content_security_policy,
  88     WebKit::WebContentSecurityPolicyType policy_type) {
  89   // Ignore multiple attempts to start this worker (can happen if two pages
  90   // try to start it simultaneously).
  91   if (started_)
  92     return;
  93
  94   impl_->startWorkerContext(url, name_, user_agent, source_code,
  95                             content_security_policy, policy_type, 0);
  96   started_ = true;
  97   url_ = url;
  98
  99   // Process any pending connections.
 100   for (PendingConnectInfoList::const_iterator iter = pending_connects_.begin();
 101        iter != pending_connects_.end();
 102        ++iter) {
 103     OnConnect(iter->first, iter->second);
 104   }
 105   pending_connects_.clear();
 106 }
 107
 108 void WebSharedWorkerStub::OnConnect(int sent_message_port_id, int routing_id) {
 109   if (started_) {
 110     WebKit::WebMessagePortChannel* channel =
 111         new WebMessagePortChannelImpl(routing_id,
 112                                       sent_message_port_id,
 113                                       base::MessageLoopProxy::current().get());
 114     impl_->connect(channel, NULL);
 115   } else {
 116     // If two documents try to load a SharedWorker at the same time, the
 117     // WorkerMsg_Connect for one of the documents can come in before the
 118     // worker is started. Just queue up the connect and deliver it once the
 119     // worker starts.
 120     PendingConnectInfo pending_connect(sent_message_port_id, routing_id);
 121     pending_connects_.push_back(pending_connect);
 122   }
 123 }
 124
 125 void WebSharedWorkerStub::OnTerminateWorkerContext() {
 126   impl_->terminateWorkerContext();
 127
 128   // Call the client to make sure context exits.
 129   EnsureWorkerContextTerminates();
 130   started_ = false;
 131 }
 132
 133 }  // namespace content