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      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/utility/utility_thread_impl.h"
      6 
      7 #include <stddef.h>
      8 
      9 #include "base/command_line.h"
     10 #include "base/files/file_path.h"
     11 #include "base/memory/scoped_vector.h"
     12 #include "content/child/child_process.h"
     13 #include "content/child/webkitplatformsupport_impl.h"
     14 #include "content/common/child_process_messages.h"
     15 #include "content/common/plugin_list.h"
     16 #include "content/common/utility_messages.h"
     17 #include "content/public/common/content_switches.h"
     18 #include "content/public/utility/content_utility_client.h"
     19 #include "ipc/ipc_sync_channel.h"
     20 #include "third_party/WebKit/public/web/WebKit.h"
     21 
     22 namespace content {
     23 
     24 namespace {
     25 
     26 template<typename SRC, typename DEST>
     27 void ConvertVector(const SRC& src, DEST* dest) {
     28   dest->reserve(src.size());
     29   for (typename SRC::const_iterator i = src.begin(); i != src.end(); ++i)
     30     dest->push_back(typename DEST::value_type(*i));
     31 }
     32 
     33 }  // namespace
     34 
     35 UtilityThreadImpl::UtilityThreadImpl() : single_process_(false) {
     36   Init();
     37 }
     38 
     39 UtilityThreadImpl::UtilityThreadImpl(const std::string& channel_name)
     40     : ChildThread(channel_name),
     41       single_process_(true) {
     42   Init();
     43 }
     44 
     45 UtilityThreadImpl::~UtilityThreadImpl() {
     46 }
     47 
     48 void UtilityThreadImpl::Shutdown() {
     49   ChildThread::Shutdown();
     50 
     51   if (!single_process_)
     52     blink::shutdown();
     53 }
     54 
     55 bool UtilityThreadImpl::Send(IPC::Message* msg) {
     56   return ChildThread::Send(msg);
     57 }
     58 
     59 void UtilityThreadImpl::ReleaseProcessIfNeeded() {
     60   if (batch_mode_)
     61     return;
     62 
     63   if (single_process_) {
     64     // Close the channel to cause UtilityProcessHostImpl to be deleted. We need
     65     // to take a different code path than the multi-process case because that
     66     // depends on the child process going away to close the channel, but that
     67     // can't happen when we're in single process mode.
     68     channel()->Close();
     69   } else {
     70     ChildProcess::current()->ReleaseProcess();
     71   }
     72 }
     73 
     74 #if defined(OS_WIN)
     75 
     76 void UtilityThreadImpl::PreCacheFont(const LOGFONT& log_font) {
     77   Send(new ChildProcessHostMsg_PreCacheFont(log_font));
     78 }
     79 
     80 void UtilityThreadImpl::ReleaseCachedFonts() {
     81   Send(new ChildProcessHostMsg_ReleaseCachedFonts());
     82 }
     83 
     84 #endif  // OS_WIN
     85 
     86 void UtilityThreadImpl::Init() {
     87   batch_mode_ = false;
     88   ChildProcess::current()->AddRefProcess();
     89   if (!single_process_) {
     90     // We can only initialize WebKit on one thread, and in single process mode
     91     // we run the utility thread on separate thread. This means that if any code
     92     // needs WebKit initialized in the utility process, they need to have
     93     // another path to support single process mode.
     94     webkit_platform_support_.reset(new WebKitPlatformSupportImpl);
     95     blink::initialize(webkit_platform_support_.get());
     96   }
     97   GetContentClient()->utility()->UtilityThreadStarted();
     98 }
     99 
    100 bool UtilityThreadImpl::OnControlMessageReceived(const IPC::Message& msg) {
    101   if (GetContentClient()->utility()->OnMessageReceived(msg))
    102     return true;
    103 
    104   bool handled = true;
    105   IPC_BEGIN_MESSAGE_MAP(UtilityThreadImpl, msg)
    106     IPC_MESSAGE_HANDLER(UtilityMsg_BatchMode_Started, OnBatchModeStarted)
    107     IPC_MESSAGE_HANDLER(UtilityMsg_BatchMode_Finished, OnBatchModeFinished)
    108 #if defined(OS_POSIX)
    109     IPC_MESSAGE_HANDLER(UtilityMsg_LoadPlugins, OnLoadPlugins)
    110 #endif  // OS_POSIX
    111     IPC_MESSAGE_UNHANDLED(handled = false)
    112   IPC_END_MESSAGE_MAP()
    113   return handled;
    114 }
    115 
    116 void UtilityThreadImpl::OnBatchModeStarted() {
    117   batch_mode_ = true;
    118 }
    119 
    120 void UtilityThreadImpl::OnBatchModeFinished() {
    121   ChildProcess::current()->ReleaseProcess();
    122 }
    123 
    124 #if defined(OS_POSIX)
    125 void UtilityThreadImpl::OnLoadPlugins(
    126     const std::vector<base::FilePath>& plugin_paths) {
    127   PluginList* plugin_list = PluginList::Singleton();
    128 
    129   std::vector<WebPluginInfo> plugins;
    130   // TODO(bauerb): If we restart loading plug-ins, we might mess up the logic in
    131   // PluginList::ShouldLoadPlugin due to missing the previously loaded plug-ins
    132   // in |plugin_groups|.
    133   for (size_t i = 0; i < plugin_paths.size(); ++i) {
    134     WebPluginInfo plugin;
    135     if (!plugin_list->LoadPluginIntoPluginList(
    136         plugin_paths[i], &plugins, &plugin))
    137       Send(new UtilityHostMsg_LoadPluginFailed(i, plugin_paths[i]));
    138     else
    139       Send(new UtilityHostMsg_LoadedPlugin(i, plugin));
    140   }
    141 
    142   ReleaseProcessIfNeeded();
    143 }
    144 #endif
    145 
    146 }  // namespace content
    147