chrome/browser/net/utility_process_mojo_proxy_resolver_factory.cc

   1 // Copyright 2015 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 "chrome/browser/net/utility_process_mojo_proxy_resolver_factory.h"
   6
   7 #include "base/logging.h"
   8 #include "base/memory/singleton.h"
   9 #include "base/single_thread_task_runner.h"
  10 #include "base/thread_task_runner_handle.h"
  11 #include "chrome/grit/generated_resources.h"
  12 #include "content/public/browser/browser_thread.h"
  13 #include "content/public/browser/utility_process_host.h"
  14 #include "content/public/browser/utility_process_host_client.h"
  15 #include "content/public/common/service_registry.h"
  16 #include "ui/base/l10n/l10n_util.h"
  17
  18 namespace {
  19 const int kUtilityProcessIdleTimeoutSeconds = 5;
  20 }
  21
  22 // static
  23 UtilityProcessMojoProxyResolverFactory*
  24 UtilityProcessMojoProxyResolverFactory::GetInstance() {
  25   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
  26   return base::Singleton<UtilityProcessMojoProxyResolverFactory,
  27                          base::LeakySingletonTraits<
  28                              UtilityProcessMojoProxyResolverFactory>>::get();
  29 }
  30
  31 UtilityProcessMojoProxyResolverFactory::
  32     UtilityProcessMojoProxyResolverFactory() {
  33   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
  34 }
  35
  36 UtilityProcessMojoProxyResolverFactory::
  37     ~UtilityProcessMojoProxyResolverFactory() {
  38   DCHECK(thread_checker_.CalledOnValidThread());
  39 }
  40
  41 void UtilityProcessMojoProxyResolverFactory::CreateProcessAndConnect() {
  42   DCHECK(thread_checker_.CalledOnValidThread());
  43   DVLOG(1) << "Attempting to create utility process for proxy resolver";
  44   content::UtilityProcessHost* utility_process_host =
  45       content::UtilityProcessHost::Create(
  46           scoped_refptr<content::UtilityProcessHostClient>(),
  47           base::ThreadTaskRunnerHandle::Get());
  48   utility_process_host->SetName(l10n_util::GetStringUTF16(
  49       IDS_UTILITY_PROCESS_PROXY_RESOLVER_NAME));
  50   bool process_started = utility_process_host->StartMojoMode();
  51   if (process_started) {
  52     content::ServiceRegistry* service_registry =
  53         utility_process_host->GetServiceRegistry();
  54     service_registry->ConnectToRemoteService(
  55         mojo::GetProxy(&resolver_factory_));
  56     resolver_factory_.set_connection_error_handler(
  57         base::Bind(&UtilityProcessMojoProxyResolverFactory::OnConnectionError,
  58                    base::Unretained(this)));
  59     weak_utility_process_host_ = utility_process_host->AsWeakPtr();
  60   } else {
  61     LOG(ERROR) << "Unable to connect to utility process";
  62   }
  63 }
  64
  65 scoped_ptr<base::ScopedClosureRunner>
  66 UtilityProcessMojoProxyResolverFactory::CreateResolver(
  67     const mojo::String& pac_script,
  68     mojo::InterfaceRequest<net::interfaces::ProxyResolver> req,
  69     net::interfaces::ProxyResolverFactoryRequestClientPtr client) {
  70   DCHECK(thread_checker_.CalledOnValidThread());
  71   if (!resolver_factory_)
  72     CreateProcessAndConnect();
  73
  74   if (!resolver_factory_) {
  75     // If there's still no factory, then utility process creation failed so
  76     // close |req|'s message pipe, which should cause a connection error.
  77     req = nullptr;
  78     return nullptr;
  79   }
  80   idle_timer_.Stop();
  81   num_proxy_resolvers_++;
  82   resolver_factory_->CreateResolver(pac_script, req.Pass(), client.Pass());
  83   return make_scoped_ptr(new base::ScopedClosureRunner(
  84       base::Bind(&UtilityProcessMojoProxyResolverFactory::OnResolverDestroyed,
  85                  base::Unretained(this))));
  86 }
  87
  88 void UtilityProcessMojoProxyResolverFactory::OnConnectionError() {
  89   DVLOG(1) << "Disconnection from utility process detected";
  90   resolver_factory_.reset();
  91 }
  92
  93 void UtilityProcessMojoProxyResolverFactory::OnResolverDestroyed() {
  94   DCHECK(thread_checker_.CalledOnValidThread());
  95   DCHECK_GT(num_proxy_resolvers_, 0u);
  96   if (--num_proxy_resolvers_ == 0) {
  97     // When all proxy resolvers have been destroyed, the proxy resolver utility
  98     // process is no longer needed. However, new proxy resolvers may be created
  99     // shortly after being destroyed (e.g. due to a network change). If the
 100     // utility process is shut down immediately, this would cause unnecessary
 101     // process churn, so wait for an idle timeout before shutting down the
 102     // proxy resolver utility process.
 103     idle_timer_.Start(
 104         FROM_HERE,
 105         base::TimeDelta::FromSeconds(kUtilityProcessIdleTimeoutSeconds), this,
 106         &UtilityProcessMojoProxyResolverFactory::OnIdleTimeout);
 107   }
 108 }
 109
 110 void UtilityProcessMojoProxyResolverFactory::OnIdleTimeout() {
 111   DCHECK(thread_checker_.CalledOnValidThread());
 112   DCHECK_EQ(num_proxy_resolvers_, 0u);
 113   delete weak_utility_process_host_.get();
 114   weak_utility_process_host_.reset();
 115   resolver_factory_.reset();
 116 }