src/chromeos/system/statistics_provider.cc

   1 // Copyright 2013 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 "chromeos/system/statistics_provider.h"
   6
   7 #include "base/bind.h"
   8 #include "base/command_line.h"
   9 #include "base/files/file_path.h"
  10 #include "base/location.h"
  11 #include "base/logging.h"
  12 #include "base/memory/singleton.h"
  13 #include "base/path_service.h"
  14 #include "base/synchronization/cancellation_flag.h"
  15 #include "base/synchronization/waitable_event.h"
  16 #include "base/sys_info.h"
  17 #include "base/task_runner.h"
  18 #include "base/threading/thread_restrictions.h"
  19 #include "base/time/time.h"
  20 #include "chromeos/app_mode/kiosk_oem_manifest_parser.h"
  21 #include "chromeos/chromeos_constants.h"
  22 #include "chromeos/chromeos_switches.h"
  23 #include "chromeos/system/name_value_pairs_parser.h"
  24
  25 namespace chromeos {
  26 namespace system {
  27
  28 namespace {
  29
  30 // Path to the tool used to get system info, and delimiters for the output
  31 // format of the tool.
  32 const char* kCrosSystemTool[] = { "/usr/bin/crossystem" };
  33 const char kCrosSystemEq[] = "=";
  34 const char kCrosSystemDelim[] = "\n";
  35 const char kCrosSystemCommentDelim[] = "#";
  36 const char kCrosSystemUnknownValue[] = "(error)";
  37
  38 const char kHardwareClassCrosSystemKey[] = "hwid";
  39 const char kUnknownHardwareClass[] = "unknown";
  40
  41 // File to get machine hardware info from, and key/value delimiters of
  42 // the file.
  43 // /tmp/machine-info is generated by platform/init/chromeos_startup.
  44 const char kMachineHardwareInfoFile[] = "/tmp/machine-info";
  45 const char kMachineHardwareInfoEq[] = "=";
  46 const char kMachineHardwareInfoDelim[] = " \n";
  47
  48 // File to get ECHO coupon info from, and key/value delimiters of
  49 // the file.
  50 const char kEchoCouponFile[] = "/var/cache/echo/vpd_echo.txt";
  51 const char kEchoCouponEq[] = "=";
  52 const char kEchoCouponDelim[] = "\n";
  53
  54 // File to get VPD info from, and key/value delimiters of the file.
  55 const char kVpdFile[] = "/var/log/vpd_2.0.txt";
  56 const char kVpdEq[] = "=";
  57 const char kVpdDelim[] = "\n";
  58
  59 // Timeout that we should wait for statistics to get loaded
  60 const int kTimeoutSecs = 3;
  61
  62 // The location of OEM manifest file used to trigger OOBE flow for kiosk mode.
  63 const CommandLine::CharType kOemManifestFilePath[] =
  64     FILE_PATH_LITERAL("/usr/share/oem/oobe/manifest.json");
  65
  66 }  // namespace
  67
  68 // Key values for GetMachineStatistic()/GetMachineFlag() calls.
  69 const char kDevSwitchBootMode[] = "devsw_boot";
  70 const char kHardwareClassKey[] = "hardware_class";
  71 const char kOffersCouponCodeKey[] = "ubind_attribute";
  72 const char kOffersGroupCodeKey[] = "gbind_attribute";
  73 const char kOemCanExitEnterpriseEnrollmentKey[] = "oem_can_exit_enrollment";
  74 const char kOemDeviceRequisitionKey[] = "oem_device_requisition";
  75 const char kOemIsEnterpriseManagedKey[] = "oem_enterprise_managed";
  76 const char kOemKeyboardDrivenOobeKey[] = "oem_keyboard_driven_oobe";
  77
  78 // The StatisticsProvider implementation used in production.
  79 class StatisticsProviderImpl : public StatisticsProvider {
  80  public:
  81   // StatisticsProvider implementation:
  82   virtual void StartLoadingMachineStatistics(
  83       const scoped_refptr<base::TaskRunner>& file_task_runner,
  84       bool load_oem_manifest) OVERRIDE;
  85   virtual bool GetMachineStatistic(const std::string& name,
  86                                    std::string* result) OVERRIDE;
  87   virtual bool GetMachineFlag(const std::string& name, bool* result) OVERRIDE;
  88   virtual void Shutdown() OVERRIDE;
  89
  90   static StatisticsProviderImpl* GetInstance();
  91
  92  protected:
  93   typedef std::map<std::string, bool> MachineFlags;
  94   friend struct DefaultSingletonTraits<StatisticsProviderImpl>;
  95
  96   StatisticsProviderImpl();
  97   virtual ~StatisticsProviderImpl();
  98
  99   // Waits up to |kTimeoutSecs| for statistics to be loaded. Returns true if
 100   // they were loaded successfully.
 101   bool WaitForStatisticsLoaded();
 102
 103   // Loads the machine statistics off of disk. Runs on the file thread.
 104   void LoadMachineStatistics(bool load_oem_manifest);
 105
 106   // Loads the OEM statistics off of disk. Runs on the file thread.
 107   void LoadOemManifestFromFile(const base::FilePath& file);
 108
 109   bool load_statistics_started_;
 110   NameValuePairsParser::NameValueMap machine_info_;
 111   MachineFlags machine_flags_;
 112   base::CancellationFlag cancellation_flag_;
 113   // |on_statistics_loaded_| protects |machine_info_| and |machine_flags_|.
 114   base::WaitableEvent on_statistics_loaded_;
 115
 116  private:
 117   DISALLOW_COPY_AND_ASSIGN(StatisticsProviderImpl);
 118 };
 119
 120 bool StatisticsProviderImpl::WaitForStatisticsLoaded() {
 121   CHECK(load_statistics_started_);
 122   if (on_statistics_loaded_.IsSignaled())
 123     return true;
 124
 125   // Block if the statistics are not loaded yet. Normally this shouldn't
 126   // happen excpet during OOBE.
 127   base::Time start_time = base::Time::Now();
 128   base::ThreadRestrictions::ScopedAllowWait allow_wait;
 129   on_statistics_loaded_.TimedWait(base::TimeDelta::FromSeconds(kTimeoutSecs));
 130
 131   base::TimeDelta dtime = base::Time::Now() - start_time;
 132   if (on_statistics_loaded_.IsSignaled()) {
 133     LOG(ERROR) << "Statistics loaded after waiting "
 134                << dtime.InMilliseconds() << "ms. ";
 135     return true;
 136   }
 137
 138   LOG(ERROR) << "Statistics not loaded after waiting "
 139              << dtime.InMilliseconds() << "ms. ";
 140   return false;
 141 }
 142
 143 bool StatisticsProviderImpl::GetMachineStatistic(const std::string& name,
 144                                                  std::string* result) {
 145   VLOG(1) << "Machine Statistic requested: " << name;
 146   if (!WaitForStatisticsLoaded()) {
 147     LOG(ERROR) << "GetMachineStatistic called before load started: " << name;
 148     return false;
 149   }
 150
 151   NameValuePairsParser::NameValueMap::iterator iter = machine_info_.find(name);
 152   if (iter == machine_info_.end()) {
 153     if (base::SysInfo::IsRunningOnChromeOS())
 154       LOG(WARNING) << "Requested statistic not found: " << name;
 155     return false;
 156   }
 157   *result = iter->second;
 158   return true;
 159 }
 160
 161 bool StatisticsProviderImpl::GetMachineFlag(const std::string& name,
 162                                             bool* result) {
 163   VLOG(1) << "Machine Flag requested: " << name;
 164   if (!WaitForStatisticsLoaded()) {
 165     LOG(ERROR) << "GetMachineFlag called before load started: " << name;
 166     return false;
 167   }
 168
 169   MachineFlags::const_iterator iter = machine_flags_.find(name);
 170   if (iter == machine_flags_.end()) {
 171     if (base::SysInfo::IsRunningOnChromeOS())
 172       LOG(WARNING) << "Requested machine flag not found: " << name;
 173     return false;
 174   }
 175   *result = iter->second;
 176   return true;
 177 }
 178
 179 void StatisticsProviderImpl::Shutdown() {
 180   cancellation_flag_.Set();  // Cancel any pending loads
 181 }
 182
 183 StatisticsProviderImpl::StatisticsProviderImpl()
 184     : load_statistics_started_(false),
 185       on_statistics_loaded_(true  /* manual_reset */,
 186                             false /* initially_signaled */) {
 187 }
 188
 189 StatisticsProviderImpl::~StatisticsProviderImpl() {
 190 }
 191
 192 void StatisticsProviderImpl::StartLoadingMachineStatistics(
 193     const scoped_refptr<base::TaskRunner>& file_task_runner,
 194     bool load_oem_manifest) {
 195   CHECK(!load_statistics_started_);
 196   load_statistics_started_ = true;
 197
 198   VLOG(1) << "Started loading statistics. Load OEM Manifest: "
 199           << load_oem_manifest;
 200
 201   file_task_runner->PostTask(
 202       FROM_HERE,
 203       base::Bind(&StatisticsProviderImpl::LoadMachineStatistics,
 204                  base::Unretained(this),
 205                  load_oem_manifest));
 206 }
 207
 208 void StatisticsProviderImpl::LoadMachineStatistics(bool load_oem_manifest) {
 209   // Run from the file task runner. StatisticsProviderImpl is a Singleton<> and
 210   // will not be destroyed until after threads have been stopped, so this test
 211   // is always safe.
 212   if (cancellation_flag_.IsSet())
 213     return;
 214
 215   if (base::SysInfo::IsRunningOnChromeOS()) {
 216     // Parse all of the key/value pairs from the crossystem tool.
 217     NameValuePairsParser parser(&machine_info_);
 218     if (!parser.ParseNameValuePairsFromTool(arraysize(kCrosSystemTool),
 219                                             kCrosSystemTool,
 220                                             kCrosSystemEq,
 221                                             kCrosSystemDelim,
 222                                             kCrosSystemCommentDelim)) {
 223       LOG(ERROR) << "Errors parsing output from: " << kCrosSystemTool;
 224     }
 225
 226     parser.GetNameValuePairsFromFile(base::FilePath(kMachineHardwareInfoFile),
 227                                      kMachineHardwareInfoEq,
 228                                      kMachineHardwareInfoDelim);
 229     parser.GetNameValuePairsFromFile(base::FilePath(kEchoCouponFile),
 230                                      kEchoCouponEq,
 231                                      kEchoCouponDelim);
 232     parser.GetNameValuePairsFromFile(base::FilePath(kVpdFile),
 233                                      kVpdEq,
 234                                      kVpdDelim);
 235   }
 236
 237   // Ensure that the hardware class key is present with the expected
 238   // key name, and if it couldn't be retrieved, that the value is "unknown".
 239   std::string hardware_class = machine_info_[kHardwareClassCrosSystemKey];
 240   if (hardware_class.empty() || hardware_class == kCrosSystemUnknownValue)
 241     machine_info_[kHardwareClassKey] = kUnknownHardwareClass;
 242   else
 243     machine_info_[kHardwareClassKey] = hardware_class;
 244
 245   if (load_oem_manifest) {
 246     // If kAppOemManifestFile switch is specified, load OEM Manifest file.
 247     CommandLine* command_line = CommandLine::ForCurrentProcess();
 248     if (command_line->HasSwitch(switches::kAppOemManifestFile)) {
 249       LoadOemManifestFromFile(
 250           command_line->GetSwitchValuePath(switches::kAppOemManifestFile));
 251     } else if (base::SysInfo::IsRunningOnChromeOS()) {
 252       LoadOemManifestFromFile(base::FilePath(kOemManifestFilePath));
 253     }
 254   }
 255
 256   // Finished loading the statistics.
 257   on_statistics_loaded_.Signal();
 258   VLOG(1) << "Finished loading statistics.";
 259 }
 260
 261 void StatisticsProviderImpl::LoadOemManifestFromFile(
 262     const base::FilePath& file) {
 263   // Called from LoadMachineStatistics. Check cancellation_flag_ again here.
 264   if (cancellation_flag_.IsSet())
 265     return;
 266
 267   KioskOemManifestParser::Manifest oem_manifest;
 268   if (!KioskOemManifestParser::Load(file, &oem_manifest)) {
 269     LOG(WARNING) << "Unable to load OEM Manifest file: " << file.value();
 270     return;
 271   }
 272   machine_info_[kOemDeviceRequisitionKey] =
 273       oem_manifest.device_requisition;
 274   machine_flags_[kOemIsEnterpriseManagedKey] =
 275       oem_manifest.enterprise_managed;
 276   machine_flags_[kOemCanExitEnterpriseEnrollmentKey] =
 277       oem_manifest.can_exit_enrollment;
 278   machine_flags_[kOemKeyboardDrivenOobeKey] =
 279       oem_manifest.keyboard_driven_oobe;
 280
 281   VLOG(1) << "Loaded OEM Manifest statistics from " << file.value();
 282 }
 283
 284 StatisticsProviderImpl* StatisticsProviderImpl::GetInstance() {
 285   return Singleton<StatisticsProviderImpl,
 286                    DefaultSingletonTraits<StatisticsProviderImpl> >::get();
 287 }
 288
 289 static StatisticsProvider* g_test_statistics_provider = NULL;
 290
 291 // static
 292 StatisticsProvider* StatisticsProvider::GetInstance() {
 293   if (g_test_statistics_provider)
 294     return g_test_statistics_provider;
 295   return StatisticsProviderImpl::GetInstance();
 296 }
 297
 298 // static
 299 void StatisticsProvider::SetTestProvider(StatisticsProvider* test_provider) {
 300   g_test_statistics_provider = test_provider;
 301 }
 302
 303 }  // namespace system
 304 }  // namespace chromeos