path: root/chrome/browser/dom_ui/net_internals_ui.cc

// Copyright (c) 2010 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 "chrome/browser/dom_ui/net_internals_ui.h"

#include <algorithm>
#include <sstream>
#include <string>
#include <utility>
#include <vector>

#include "app/l10n_util.h"
#include "app/resource_bundle.h"
#include "base/command_line.h"
#include "base/file_util.h"
#include "base/file_version_info.h"
#include "base/message_loop.h"
#include "base/path_service.h"
#include "base/singleton.h"
#include "base/string_piece.h"
#include "base/string_util.h"
#include "base/utf_string_conversions.h"
#include "base/values.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/chrome_thread.h"
#include "chrome/browser/dom_ui/chrome_url_data_manager.h"
#include "chrome/browser/io_thread.h"
#include "chrome/browser/net/chrome_net_log.h"
#include "chrome/browser/net/connection_tester.h"
#include "chrome/browser/net/passive_log_collector.h"
#include "chrome/browser/net/url_fixer_upper.h"
#include "chrome/browser/platform_util.h"
#include "chrome/browser/profile.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/chrome_version_info.h"
#include "chrome/common/net/url_request_context_getter.h"
#include "chrome/common/url_constants.h"
#include "grit/generated_resources.h"
#include "grit/net_internals_resources.h"
#include "net/base/escape.h"
#include "net/base/host_resolver_impl.h"
#include "net/base/net_errors.h"
#include "net/base/net_util.h"
#include "net/base/sys_addrinfo.h"
#include "net/disk_cache/disk_cache.h"
#include "net/http/http_cache.h"
#include "net/proxy/proxy_service.h"
#include "net/url_request/url_request_context.h"

namespace {

// Formats |t| as a decimal number, in milliseconds.
std::string TickCountToString(const base::TimeTicks& t) {
  return Int64ToString((t - base::TimeTicks()).InMilliseconds());
}

// Returns the HostCache for |context|'s primary HostResolver, or NULL if
// there is none.
net::HostCache* GetHostResolverCache(URLRequestContext* context) {
  net::HostResolverImpl* host_resolver_impl =
      context->host_resolver()->GetAsHostResolverImpl();

  if (!host_resolver_impl)
    return NULL;

  return host_resolver_impl->cache();
}

// Returns the disk cache backend for |context| if there is one, or NULL.
disk_cache::Backend* GetDiskCacheBackend(URLRequestContext* context) {
  if (!context->http_transaction_factory())
    return NULL;

  net::HttpCache* http_cache = context->http_transaction_factory()->GetCache();
  if (!http_cache)
    return NULL;

  return http_cache->GetCurrentBackend();
}

// Serializes the specified event to a DictionaryValue.
Value* EntryToDictionaryValue(net::NetLog::EventType type,
                              const base::TimeTicks& time,
                              const net::NetLog::Source& source,
                              net::NetLog::EventPhase phase,
                              net::NetLog::EventParameters* params) {
  DictionaryValue* entry_dict = new DictionaryValue();

  // Set the entry time. (Note that we send it as a string since integers
  // might overflow).
  entry_dict->SetString(L"time", TickCountToString(time));

  // Set the entry source.
  DictionaryValue* source_dict = new DictionaryValue();
  source_dict->SetInteger(L"id", source.id);
  source_dict->SetInteger(L"type", static_cast<int>(source.type));
  entry_dict->Set(L"source", source_dict);

  // Set the event info.
  entry_dict->SetInteger(L"type", static_cast<int>(type));
  entry_dict->SetInteger(L"phase", static_cast<int>(phase));

  // Set the event-specific parameters.
  if (params)
    entry_dict->Set(L"params", params->ToValue());

  return entry_dict;
}

Value* ExperimentToValue(const ConnectionTester::Experiment& experiment) {
  DictionaryValue* dict = new DictionaryValue();

  if (experiment.url.is_valid())
    dict->SetString(L"url", experiment.url.spec());

  dict->SetStringFromUTF16(
      L"proxy_settings_experiment",
      ConnectionTester::ProxySettingsExperimentDescription(
          experiment.proxy_settings_experiment));
  dict->SetStringFromUTF16(
      L"host_resolver_experiment",
      ConnectionTester::HostResolverExperimentDescription(
          experiment.host_resolver_experiment));
  return dict;
}

class NetInternalsHTMLSource : public ChromeURLDataManager::DataSource {
 public:
  NetInternalsHTMLSource();

  // Called when the network layer has requested a resource underneath
  // the path we registered.
  virtual void StartDataRequest(const std::string& path,
                                bool is_off_the_record,
                                int request_id);
  virtual std::string GetMimeType(const std::string&) const;

 private:
  ~NetInternalsHTMLSource() {}
  DISALLOW_COPY_AND_ASSIGN(NetInternalsHTMLSource);
};

// This class receives javascript messages from the renderer.
// Note that the DOMUI infrastructure runs on the UI thread, therefore all of
// this class's methods are expected to run on the UI thread.
//
// Since the network code we want to run lives on the IO thread, we proxy
// everything over to NetInternalsMessageHandler::IOThreadImpl, which runs
// on the IO thread.
//
// TODO(eroman): Can we start on the IO thread to begin with?
class NetInternalsMessageHandler
    : public DOMMessageHandler,
      public base::SupportsWeakPtr<NetInternalsMessageHandler> {
 public:
  NetInternalsMessageHandler();
  virtual ~NetInternalsMessageHandler();

  // DOMMessageHandler implementation.
  virtual DOMMessageHandler* Attach(DOMUI* dom_ui);
  virtual void RegisterMessages();

  // Executes the javascript function |function_name| in the renderer, passing
  // it the argument |value|.
  void CallJavascriptFunction(const std::wstring& function_name,
                              const Value* value);

 private:
  class IOThreadImpl;

  // This is the "real" message handler, which lives on the IO thread.
  scoped_refptr<IOThreadImpl> proxy_;

  DISALLOW_COPY_AND_ASSIGN(NetInternalsMessageHandler);
};

// This class is the "real" message handler. With the exception of being
// allocated and destroyed on the UI thread, its methods are expected to be
// called from the IO thread.
class NetInternalsMessageHandler::IOThreadImpl
    : public base::RefCountedThreadSafe<
          NetInternalsMessageHandler::IOThreadImpl,
          ChromeThread::DeleteOnUIThread>,
      public ChromeNetLog::Observer,
      public ConnectionTester::Delegate {
 public:
  // Type for methods that can be used as MessageHandler callbacks.
  typedef void (IOThreadImpl::*MessageHandler)(const Value*);

  // Creates a proxy for |handler| that will live on the IO thread.
  // |handler| is a weak pointer, since it is possible for the DOMMessageHandler
  // to be deleted on the UI thread while we were executing on the IO thread.
  // |io_thread| is the global IOThread (it is passed in as an argument since
  // we need to grab it from the UI thread).
  IOThreadImpl(
      const base::WeakPtr<NetInternalsMessageHandler>& handler,
      IOThread* io_thread,
      URLRequestContextGetter* context_getter);

  ~IOThreadImpl();

  // Creates a callback that will run |method| on the IO thread.
  //
  // This can be used with DOMUI::RegisterMessageCallback() to bind to a method
  // on the IO thread.
  DOMUI::MessageCallback* CreateCallback(MessageHandler method);

  // Called once the DOMUI has been deleted (i.e. renderer went away), on the
  // IO thread.
  void Detach();

  //--------------------------------
  // Javascript message handlers:
  //--------------------------------

  // This message is called after the webpage's onloaded handler has fired.
  // it indicates that the renderer is ready to start receiving captured data.
  void OnRendererReady(const Value* value);

  void OnGetProxySettings(const Value* value);
  void OnReloadProxySettings(const Value* value);
  void OnGetBadProxies(const Value* value);
  void OnClearBadProxies(const Value* value);
  void OnGetHostResolverCache(const Value* value);
  void OnClearHostResolverCache(const Value* value);
  void OnGetPassiveLogEntries(const Value* value);
  void OnStartConnectionTests(const Value* value);
  void OnGetHttpCacheInfo(const Value* value);

  // ChromeNetLog::Observer implementation:
  virtual void OnAddEntry(net::NetLog::EventType type,
                          const base::TimeTicks& time,
                          const net::NetLog::Source& source,
                          net::NetLog::EventPhase phase,
                          net::NetLog::EventParameters* params);

  // ConnectionTester::Delegate implementation:
  virtual void OnStartConnectionTestSuite();
  virtual void OnStartConnectionTestExperiment(
      const ConnectionTester::Experiment& experiment);
  virtual void OnCompletedConnectionTestExperiment(
      const ConnectionTester::Experiment& experiment,
      int result);
  virtual void OnCompletedConnectionTestSuite();

 private:
  class CallbackHelper;

  // Helper that runs |method| with |arg|, and deletes |arg| on completion.
  void DispatchToMessageHandler(Value* arg, MessageHandler method);

  // Helper that executes |function_name| in the attached renderer.
  // The function takes ownership of |arg|.
  void CallJavascriptFunction(const std::wstring& function_name,
                              Value* arg);

  // Pointer to the UI-thread message handler. Only access this from
  // the UI thread.
  base::WeakPtr<NetInternalsMessageHandler> handler_;

  // The global IOThread, which contains the global NetLog to observer.
  IOThread* io_thread_;

  scoped_refptr<URLRequestContextGetter> context_getter_;

  // Helper that runs the suite of connection tests.
  scoped_ptr<ConnectionTester> connection_tester_;

  // True if we have attached an observer to the NetLog already.
  bool is_observing_log_;
  friend class base::RefCountedThreadSafe<IOThreadImpl>;
};

// Helper class for a DOMUI::MessageCallback which when excuted calls
// instance->*method(value) on the IO thread.
class NetInternalsMessageHandler::IOThreadImpl::CallbackHelper
    : public DOMUI::MessageCallback {
 public:
  CallbackHelper(IOThreadImpl* instance, IOThreadImpl::MessageHandler method)
      : instance_(instance),
        method_(method) {
    DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
  }

  virtual void RunWithParams(const Tuple1<const Value*>& params) {
    DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));

    // We need to make a copy of the value in order to pass it over to the IO
    // thread. We will delete this in IOThreadImpl::DispatchMessageHandler().
    Value* value_copy = params.a ? params.a->DeepCopy() : NULL;

    if (!ChromeThread::PostTask(
            ChromeThread::IO, FROM_HERE,
            NewRunnableMethod(instance_.get(),
                              &IOThreadImpl::DispatchToMessageHandler,
                              value_copy, method_))) {
      // Failed posting the task, avoid leaking |value_copy|.
      delete value_copy;
    }
  }

 private:
  scoped_refptr<IOThreadImpl> instance_;
  IOThreadImpl::MessageHandler method_;
};

////////////////////////////////////////////////////////////////////////////////
//
// NetInternalsHTMLSource
//
////////////////////////////////////////////////////////////////////////////////

NetInternalsHTMLSource::NetInternalsHTMLSource()
    : DataSource(chrome::kChromeUINetInternalsHost, MessageLoop::current()) {
}

void NetInternalsHTMLSource::StartDataRequest(const std::string& path,
                                              bool is_off_the_record,
                                              int request_id) {
  // The provided "path" may contain a fragment, or query section. We only
  // care about the path itself, and will disregard anything else.
  std::string filename =
      GURL(std::string("chrome://net/") + path).path().substr(1);

  // The source for the net internals page is flattened during compilation, so
  // the only resource that should legitimately be requested is the main file.
  // Note that users can type anything into the address bar, though, so we must
  // handle arbitrary input.
  if (filename.empty() || filename == "index.html") {
    scoped_refptr<RefCountedStaticMemory> bytes(
        ResourceBundle::GetSharedInstance().LoadDataResourceBytes(
            IDR_NET_INTERNALS_INDEX_HTML));
    if (bytes && bytes->front()) {
      SendResponse(request_id, bytes);
      return;
    }
  }

  const std::string data_string("<p style='color:red'>Failed to read resource" +
      EscapeForHTML(filename) + "</p>");
  scoped_refptr<RefCountedBytes> bytes(new RefCountedBytes);
  bytes->data.resize(data_string.size());
  std::copy(data_string.begin(), data_string.end(), bytes->data.begin());
  SendResponse(request_id, bytes);
}

std::string NetInternalsHTMLSource::GetMimeType(const std::string&) const {
  return "text/html";
}

////////////////////////////////////////////////////////////////////////////////
//
// NetInternalsMessageHandler
//
////////////////////////////////////////////////////////////////////////////////

NetInternalsMessageHandler::NetInternalsMessageHandler() {}

NetInternalsMessageHandler::~NetInternalsMessageHandler() {
  if (proxy_) {
    // Notify the handler on the IO thread that the renderer is gone.
    ChromeThread::PostTask(ChromeThread::IO, FROM_HERE,
        NewRunnableMethod(proxy_.get(), &IOThreadImpl::Detach));
  }
}

DOMMessageHandler* NetInternalsMessageHandler::Attach(DOMUI* dom_ui) {
  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
  proxy_ = new IOThreadImpl(this->AsWeakPtr(), g_browser_process->io_thread(),
                            dom_ui->GetProfile()->GetRequestContext());
  DOMMessageHandler* result = DOMMessageHandler::Attach(dom_ui);
  return result;
}

void NetInternalsMessageHandler::RegisterMessages() {
  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));

  dom_ui_->RegisterMessageCallback(
      "notifyReady",
      proxy_->CreateCallback(&IOThreadImpl::OnRendererReady));
  dom_ui_->RegisterMessageCallback(
      "getProxySettings",
      proxy_->CreateCallback(&IOThreadImpl::OnGetProxySettings));
  dom_ui_->RegisterMessageCallback(
      "reloadProxySettings",
      proxy_->CreateCallback(&IOThreadImpl::OnReloadProxySettings));
  dom_ui_->RegisterMessageCallback(
      "getBadProxies",
      proxy_->CreateCallback(&IOThreadImpl::OnGetBadProxies));
  dom_ui_->RegisterMessageCallback(
      "clearBadProxies",
      proxy_->CreateCallback(&IOThreadImpl::OnClearBadProxies));
  dom_ui_->RegisterMessageCallback(
      "getHostResolverCache",
      proxy_->CreateCallback(&IOThreadImpl::OnGetHostResolverCache));
  dom_ui_->RegisterMessageCallback(
      "clearHostResolverCache",
      proxy_->CreateCallback(&IOThreadImpl::OnClearHostResolverCache));
  dom_ui_->RegisterMessageCallback(
      "getPassiveLogEntries",
      proxy_->CreateCallback(&IOThreadImpl::OnGetPassiveLogEntries));
  dom_ui_->RegisterMessageCallback(
      "startConnectionTests",
      proxy_->CreateCallback(&IOThreadImpl::OnStartConnectionTests));
  dom_ui_->RegisterMessageCallback(
      "getHttpCacheInfo",
      proxy_->CreateCallback(&IOThreadImpl::OnGetHttpCacheInfo));
}

void NetInternalsMessageHandler::CallJavascriptFunction(
    const std::wstring& function_name,
    const Value* value) {
  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
  if (value) {
    dom_ui_->CallJavascriptFunction(function_name, *value);
  } else {
    dom_ui_->CallJavascriptFunction(function_name);
  }
}

////////////////////////////////////////////////////////////////////////////////
//
// NetInternalsMessageHandler::IOThreadImpl
//
////////////////////////////////////////////////////////////////////////////////

NetInternalsMessageHandler::IOThreadImpl::IOThreadImpl(
    const base::WeakPtr<NetInternalsMessageHandler>& handler,
    IOThread* io_thread,
    URLRequestContextGetter* context_getter)
    : handler_(handler),
      io_thread_(io_thread),
      context_getter_(context_getter),
      is_observing_log_(false) {
  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
}

NetInternalsMessageHandler::IOThreadImpl::~IOThreadImpl() {
  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
}

DOMUI::MessageCallback*
NetInternalsMessageHandler::IOThreadImpl::CreateCallback(
    MessageHandler method) {
  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
  return new CallbackHelper(this, method);
}

void NetInternalsMessageHandler::IOThreadImpl::Detach() {
  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
  // Unregister with network stack to observe events.
  if (is_observing_log_)
    io_thread_->globals()->net_log->RemoveObserver(this);

  // Cancel any in-progress connection tests.
  connection_tester_.reset();
}

void NetInternalsMessageHandler::IOThreadImpl::OnRendererReady(
    const Value* value) {
  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
  DCHECK(!is_observing_log_) << "notifyReady called twice";

  // Register with network stack to observe events.
  is_observing_log_ = true;
  io_thread_->globals()->net_log->AddObserver(this);

  // Tell the javascript about the relationship between event type enums and
  // their symbolic name.
  {
    std::vector<net::NetLog::EventType> event_types =
        net::NetLog::GetAllEventTypes();

    DictionaryValue* dict = new DictionaryValue();

    for (size_t i = 0; i < event_types.size(); ++i) {
      const char* name = net::NetLog::EventTypeToString(event_types[i]);
      dict->SetInteger(ASCIIToWide(name),
                       static_cast<int>(event_types[i]));
    }

    CallJavascriptFunction(L"g_browser.receivedLogEventTypeConstants", dict);
  }

  // Tell the javascript about the version of the client and its
  // command line arguments.
  {
    DictionaryValue* dict = new DictionaryValue();

    scoped_ptr<FileVersionInfo> version_info(
        chrome::GetChromeVersionInfo());

    if (version_info == NULL) {
      DLOG(ERROR) << "Unable to create FileVersionInfo object";

    } else {
      // We have everything we need to send the right values.
      dict->SetString(L"version", version_info->file_version());
      dict->SetString(L"cl", version_info->last_change());
      dict->SetStringFromUTF16(L"version_mod",
          platform_util::GetVersionStringModifier());

      if (version_info->is_official_build()) {
        dict->SetString(L"official",
            l10n_util::GetString(IDS_ABOUT_VERSION_OFFICIAL));
      } else {
        dict->SetString(L"official",
            l10n_util::GetString(IDS_ABOUT_VERSION_UNOFFICIAL));
      }

      dict->SetString(L"command_line",
          CommandLine::ForCurrentProcess()->command_line_string());
    }

    CallJavascriptFunction(L"g_browser.receivedClientInfo",
                           dict);
  }

  // Tell the javascript about the relationship between load flag enums and
  // their symbolic name.
  {
    DictionaryValue* dict = new DictionaryValue();

#define LOAD_FLAG(label, value) \
    dict->SetInteger(ASCIIToWide(# label), static_cast<int>(value));
#include "net/base/load_flags_list.h"
#undef LOAD_FLAG

    CallJavascriptFunction(L"g_browser.receivedLoadFlagConstants", dict);
  }

  // Tell the javascript about the relationship between net error codes and
  // their symbolic name.
  {
    DictionaryValue* dict = new DictionaryValue();

#define NET_ERROR(label, value) \
    dict->SetInteger(ASCIIToWide(# label), static_cast<int>(value));
#include "net/base/net_error_list.h"
#undef NET_ERROR

    CallJavascriptFunction(L"g_browser.receivedNetErrorConstants", dict);
  }

  // Tell the javascript about the relationship between event phase enums and
  // their symbolic name.
  {
    DictionaryValue* dict = new DictionaryValue();

    dict->SetInteger(L"PHASE_BEGIN", net::NetLog::PHASE_BEGIN);
    dict->SetInteger(L"PHASE_END", net::NetLog::PHASE_END);
    dict->SetInteger(L"PHASE_NONE", net::NetLog::PHASE_NONE);

    CallJavascriptFunction(L"g_browser.receivedLogEventPhaseConstants", dict);
  }

  // Tell the javascript about the relationship between source type enums and
  // their symbolic name.
  {
    DictionaryValue* dict = new DictionaryValue();

#define SOURCE_TYPE(label, value) dict->SetInteger(ASCIIToWide(# label), value);
#include "net/base/net_log_source_type_list.h"
#undef SOURCE_TYPE

    CallJavascriptFunction(L"g_browser.receivedLogSourceTypeConstants", dict);
  }

  // Tell the javascript how the "time ticks" values we have given it relate to
  // actual system times. (We used time ticks throughout since they are stable
  // across system clock changes).
  {
    int64 cur_time_ms = (base::Time::Now() - base::Time()).InMilliseconds();

    int64 cur_time_ticks_ms =
        (base::TimeTicks::Now() - base::TimeTicks()).InMilliseconds();

    // If we add this number to a time tick value, it gives the timestamp.
    int64 tick_to_time_ms = cur_time_ms - cur_time_ticks_ms;

    // Chrome on all platforms stores times using the Windows epoch
    // (Jan 1 1601), but the javascript wants a unix epoch.
    // TODO(eroman): Getting the timestamp relative the to unix epoch should
    //               be part of the time library.
    const int64 kUnixEpochMs = 11644473600000LL;
    int64 tick_to_unix_time_ms = tick_to_time_ms - kUnixEpochMs;

    // Pass it as a string, since it may be too large to fit in an integer.
    CallJavascriptFunction(L"g_browser.receivedTimeTickOffset",
                           Value::CreateStringValue(
                               Int64ToString(tick_to_unix_time_ms)));
  }

  OnGetPassiveLogEntries(NULL);
  OnGetProxySettings(NULL);
  OnGetBadProxies(NULL);
  OnGetHostResolverCache(NULL);
  OnGetHttpCacheInfo(NULL);
}

void NetInternalsMessageHandler::IOThreadImpl::OnGetProxySettings(
    const Value* value) {
  URLRequestContext* context = context_getter_->GetURLRequestContext();
  net::ProxyService* proxy_service = context->proxy_service();

  // TODO(eroman): send a dictionary rather than a flat string, so client can do
  //               its own presentation.
  std::string settings_string;

  if (proxy_service->config_has_been_initialized()) {
    // net::ProxyConfig defines an operator<<.
    std::ostringstream stream;
    stream << proxy_service->config();
    settings_string = stream.str();
  }

  CallJavascriptFunction(L"g_browser.receivedProxySettings",
                         Value::CreateStringValue(settings_string));
}

void NetInternalsMessageHandler::IOThreadImpl::OnReloadProxySettings(
    const Value* value) {
  URLRequestContext* context = context_getter_->GetURLRequestContext();
  context->proxy_service()->ForceReloadProxyConfig();

  // Cause the renderer to be notified of the new values.
  OnGetProxySettings(NULL);
}

void NetInternalsMessageHandler::IOThreadImpl::OnGetBadProxies(
    const Value* value) {
  URLRequestContext* context = context_getter_->GetURLRequestContext();

  const net::ProxyRetryInfoMap& bad_proxies_map =
      context->proxy_service()->proxy_retry_info();

  ListValue* list = new ListValue();

  for (net::ProxyRetryInfoMap::const_iterator it = bad_proxies_map.begin();
       it != bad_proxies_map.end(); ++it) {
    const std::string& proxy_uri = it->first;
    const net::ProxyRetryInfo& retry_info = it->second;

    DictionaryValue* dict = new DictionaryValue();
    dict->SetString(L"proxy_uri", proxy_uri);
    dict->SetString(L"bad_until", TickCountToString(retry_info.bad_until));

    list->Append(dict);
  }

  CallJavascriptFunction(L"g_browser.receivedBadProxies", list);
}

void NetInternalsMessageHandler::IOThreadImpl::OnClearBadProxies(
    const Value* value) {
  URLRequestContext* context = context_getter_->GetURLRequestContext();
  context->proxy_service()->ClearBadProxiesCache();

  // Cause the renderer to be notified of the new values.
  OnGetBadProxies(NULL);
}

void NetInternalsMessageHandler::IOThreadImpl::OnGetHostResolverCache(
    const Value* value) {

  net::HostCache* cache =
      GetHostResolverCache(context_getter_->GetURLRequestContext());

  if (!cache) {
    CallJavascriptFunction(L"g_browser.receivedHostResolverCache", NULL);
    return;
  }

  DictionaryValue* dict = new DictionaryValue();

  dict->SetInteger(L"capacity", static_cast<int>(cache->max_entries()));
  dict->SetInteger(
      L"ttl_success_ms",
      static_cast<int>(cache->success_entry_ttl().InMilliseconds()));
  dict->SetInteger(
      L"ttl_failure_ms",
      static_cast<int>(cache->failure_entry_ttl().InMilliseconds()));

  ListValue* entry_list = new ListValue();

  for (net::HostCache::EntryMap::const_iterator it =
       cache->entries().begin();
       it != cache->entries().end();
       ++it) {
    const net::HostCache::Key& key = it->first;
    const net::HostCache::Entry* entry = it->second.get();

    DictionaryValue* entry_dict = new DictionaryValue();

    entry_dict->SetString(L"hostname", key.hostname);
    entry_dict->SetInteger(L"address_family",
        static_cast<int>(key.address_family));
    entry_dict->SetString(L"expiration", TickCountToString(entry->expiration));

    if (entry->error != net::OK) {
      entry_dict->SetInteger(L"error", entry->error);
    } else {
      // Append all of the resolved addresses.
      ListValue* address_list = new ListValue();
      const struct addrinfo* current_address = entry->addrlist.head();
      while (current_address) {
        address_list->Append(Value::CreateStringValue(
            net::NetAddressToStringWithPort(current_address)));
        current_address = current_address->ai_next;
      }
      entry_dict->Set(L"addresses", address_list);
    }

    entry_list->Append(entry_dict);
  }

  dict->Set(L"entries", entry_list);

  CallJavascriptFunction(L"g_browser.receivedHostResolverCache", dict);
}

void NetInternalsMessageHandler::IOThreadImpl::OnClearHostResolverCache(
    const Value* value) {
  net::HostCache* cache =
      GetHostResolverCache(context_getter_->GetURLRequestContext());

  if (cache)
    cache->clear();

  // Cause the renderer to be notified of the new values.
  OnGetHostResolverCache(NULL);
}

void NetInternalsMessageHandler::IOThreadImpl::OnGetPassiveLogEntries(
    const Value* value) {
  ChromeNetLog* net_log = io_thread_->globals()->net_log.get();

  PassiveLogCollector::EntryList passive_entries;
  net_log->passive_collector()->GetAllCapturedEvents(&passive_entries);

  ListValue* list = new ListValue();
  for (size_t i = 0; i < passive_entries.size(); ++i) {
    const PassiveLogCollector::Entry& e = passive_entries[i];
    list->Append(EntryToDictionaryValue(e.type,
                                        e.time,
                                        e.source,
                                        e.phase,
                                        e.params));
  }

  CallJavascriptFunction(L"g_browser.receivedPassiveLogEntries", list);
}

void NetInternalsMessageHandler::IOThreadImpl::OnStartConnectionTests(
    const Value* value) {
  // |value| should be: [<URL to test>].
  string16 url_str;
  if (value && value->GetType() == Value::TYPE_LIST) {
    const ListValue* list = static_cast<const ListValue*>(value);
    list->GetStringAsUTF16(0, &url_str);
  }

  // Try to fix-up the user provided URL into something valid.
  // For example, turn "www.google.com" into "http://www.google.com".
  GURL url(URLFixerUpper::FixupURL(UTF16ToUTF8(url_str), std::string()));

  connection_tester_.reset(new ConnectionTester(this));
  connection_tester_->RunAllTests(url);
}

void NetInternalsMessageHandler::IOThreadImpl::OnGetHttpCacheInfo(
    const Value* value) {
  DictionaryValue* info_dict = new DictionaryValue();
  DictionaryValue* stats_dict = new DictionaryValue();

  disk_cache::Backend* disk_cache = GetDiskCacheBackend(
      context_getter_->GetURLRequestContext());

  if (disk_cache) {
    // Extract the statistics key/value pairs from the backend.
    std::vector<std::pair<std::string, std::string> > stats;
    disk_cache->GetStats(&stats);
    for (size_t i = 0; i < stats.size(); ++i) {
      stats_dict->Set(ASCIIToWide(stats[i].first),
                      Value::CreateStringValue(stats[i].second));
    }
  }

  info_dict->Set(L"stats", stats_dict);

  CallJavascriptFunction(L"g_browser.receivedHttpCacheInfo", info_dict);
}

void NetInternalsMessageHandler::IOThreadImpl::OnAddEntry(
    net::NetLog::EventType type,
    const base::TimeTicks& time,
    const net::NetLog::Source& source,
    net::NetLog::EventPhase phase,
    net::NetLog::EventParameters* params) {
  DCHECK(is_observing_log_);

  CallJavascriptFunction(
      L"g_browser.receivedLogEntry",
      EntryToDictionaryValue(type, time, source, phase, params));
}

void NetInternalsMessageHandler::IOThreadImpl::OnStartConnectionTestSuite() {
  CallJavascriptFunction(L"g_browser.receivedStartConnectionTestSuite", NULL);
}

void NetInternalsMessageHandler::IOThreadImpl::OnStartConnectionTestExperiment(
    const ConnectionTester::Experiment& experiment) {
  CallJavascriptFunction(
      L"g_browser.receivedStartConnectionTestExperiment",
      ExperimentToValue(experiment));
}

void
NetInternalsMessageHandler::IOThreadImpl::OnCompletedConnectionTestExperiment(
    const ConnectionTester::Experiment& experiment,
    int result) {
  DictionaryValue* dict = new DictionaryValue();

  dict->Set(L"experiment", ExperimentToValue(experiment));
  dict->SetInteger(L"result", result);

  CallJavascriptFunction(
      L"g_browser.receivedCompletedConnectionTestExperiment",
      dict);
}

void
NetInternalsMessageHandler::IOThreadImpl::OnCompletedConnectionTestSuite() {
  CallJavascriptFunction(
      L"g_browser.receivedCompletedConnectionTestSuite",
      NULL);
}

void NetInternalsMessageHandler::IOThreadImpl::DispatchToMessageHandler(
    Value* arg, MessageHandler method) {
  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
  (this->*method)(arg);
  delete arg;
}

void NetInternalsMessageHandler::IOThreadImpl::CallJavascriptFunction(
    const std::wstring& function_name,
    Value* arg) {
  if (ChromeThread::CurrentlyOn(ChromeThread::UI)) {
    if (handler_) {
      // We check |handler_| in case it was deleted on the UI thread earlier
      // while we were running on the IO thread.
      handler_->CallJavascriptFunction(function_name, arg);
    }
    delete arg;
    return;
  }

  // Otherwise if we were called from the IO thread, bridge the request over to
  // the UI thread.

  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
  if (!ChromeThread::PostTask(
           ChromeThread::UI, FROM_HERE,
           NewRunnableMethod(
               this,
               &IOThreadImpl::CallJavascriptFunction,
               function_name, arg))) {
    // Failed posting the task, avoid leaking.
    delete arg;
  }
}

}  // namespace


////////////////////////////////////////////////////////////////////////////////
//
// NetInternalsUI
//
////////////////////////////////////////////////////////////////////////////////

NetInternalsUI::NetInternalsUI(TabContents* contents) : DOMUI(contents) {
  AddMessageHandler((new NetInternalsMessageHandler())->Attach(this));

  NetInternalsHTMLSource* html_source = new NetInternalsHTMLSource();

  // Set up the chrome://net-internals/ source.
  ChromeThread::PostTask(
      ChromeThread::IO, FROM_HERE,
      NewRunnableMethod(
          Singleton<ChromeURLDataManager>::get(),
          &ChromeURLDataManager::AddDataSource,
          make_scoped_refptr(html_source)));
}