mojo/runner/context.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 "mojo/runner/context.h"
   6
   7 #include <vector>
   8
   9 #include "base/bind.h"
  10 #include "base/command_line.h"
  11 #include "base/files/file_path.h"
  12 #include "base/lazy_instance.h"
  13 #include "base/macros.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/memory/scoped_vector.h"
  16 #include "base/path_service.h"
  17 #include "base/run_loop.h"
  18 #include "base/strings/string_number_conversions.h"
  19 #include "base/strings/string_split.h"
  20 #include "base/strings/string_util.h"
  21 #include "base/trace_event/trace_event.h"
  22 #include "build/build_config.h"
  23 #include "components/devtools_service/public/cpp/switches.h"
  24 #include "components/devtools_service/public/interfaces/devtools_service.mojom.h"
  25 #include "mojo/application/public/cpp/application_connection.h"
  26 #include "mojo/application/public/cpp/application_delegate.h"
  27 #include "mojo/application/public/cpp/application_impl.h"
  28 #include "mojo/common/trace_controller_impl.h"
  29 #include "mojo/common/tracing_impl.h"
  30 #include "mojo/edk/embedder/embedder.h"
  31 #include "mojo/edk/embedder/simple_platform_support.h"
  32 #include "mojo/runner/in_process_native_runner.h"
  33 #include "mojo/runner/out_of_process_native_runner.h"
  34 #include "mojo/runner/switches.h"
  35 #include "mojo/services/tracing/tracing.mojom.h"
  36 #include "mojo/shell/application_loader.h"
  37 #include "mojo/shell/application_manager.h"
  38 #include "mojo/shell/switches.h"
  39 #include "mojo/util/filename_util.h"
  40 #include "url/gurl.h"
  41
  42 namespace mojo {
  43 namespace runner {
  44 namespace {
  45
  46 // Used to ensure we only init once.
  47 class Setup {
  48  public:
  49   Setup() {
  50     embedder::Init(make_scoped_ptr(new embedder::SimplePlatformSupport()));
  51   }
  52
  53   ~Setup() {}
  54
  55  private:
  56   DISALLOW_COPY_AND_ASSIGN(Setup);
  57 };
  58
  59 bool ConfigureURLMappings(const base::CommandLine& command_line,
  60                           Context* context) {
  61   URLResolver* resolver = context->url_resolver();
  62
  63   // Configure the resolution of unknown mojo: URLs.
  64   GURL base_url;
  65   if (!command_line.HasSwitch(switches::kUseUpdater)) {
  66     // Use the shell's file root if the base was not specified.
  67     base_url = context->ResolveShellFileURL(std::string());
  68   }
  69
  70   if (base_url.is_valid())
  71     resolver->SetMojoBaseURL(base_url);
  72
  73   // The network service and updater must be loaded from the filesystem.
  74   // This mapping is done before the command line URL mapping are processed, so
  75   // that it can be overridden.
  76   resolver->AddURLMapping(GURL("mojo:network_service"),
  77                           context->ResolveShellFileURL(
  78                               "file:network_service/network_service.mojo"));
  79   resolver->AddURLMapping(
  80       GURL("mojo:updater"),
  81       context->ResolveShellFileURL("file:updater/updater.mojo"));
  82
  83   // Command line URL mapping.
  84   std::vector<URLResolver::OriginMapping> origin_mappings =
  85       URLResolver::GetOriginMappings(command_line.argv());
  86   for (const auto& origin_mapping : origin_mappings)
  87     resolver->AddOriginMapping(GURL(origin_mapping.origin),
  88                                GURL(origin_mapping.base_url));
  89
  90   if (command_line.HasSwitch(switches::kURLMappings)) {
  91     const std::string mappings =
  92         command_line.GetSwitchValueASCII(switches::kURLMappings);
  93
  94     base::StringPairs pairs;
  95     if (!base::SplitStringIntoKeyValuePairs(mappings, '=', ',', &pairs))
  96       return false;
  97     using StringPair = std::pair<std::string, std::string>;
  98     for (const StringPair& pair : pairs) {
  99       const GURL from(pair.first);
 100       const GURL to = context->ResolveCommandLineURL(pair.second);
 101       if (!from.is_valid() || !to.is_valid())
 102         return false;
 103       resolver->AddURLMapping(from, to);
 104     }
 105   }
 106
 107   return true;
 108 }
 109
 110 void InitContentHandlers(shell::ApplicationManager* manager,
 111                          const base::CommandLine& command_line) {
 112   // Default content handlers.
 113   manager->RegisterContentHandler("application/pdf", GURL("mojo:pdf_viewer"));
 114   manager->RegisterContentHandler("image/png", GURL("mojo:png_viewer"));
 115   manager->RegisterContentHandler("text/html", GURL("mojo:html_viewer"));
 116
 117   // Command-line-specified content handlers.
 118   std::string handlers_spec =
 119       command_line.GetSwitchValueASCII(switches::kContentHandlers);
 120   if (handlers_spec.empty())
 121     return;
 122
 123 #if defined(OS_ANDROID)
 124   // TODO(eseidel): On Android we pass command line arguments is via the
 125   // 'parameters' key on the intent, which we specify during 'am shell start'
 126   // via --esa, however that expects comma-separated values and says:
 127   //   am shell --help:
 128   //     [--esa <EXTRA_KEY> <EXTRA_STRING_VALUE>[,<EXTRA_STRING_VALUE...]]
 129   //     (to embed a comma into a string escape it using "\,")
 130   // Whatever takes 'parameters' and constructs a CommandLine is failing to
 131   // un-escape the commas, we need to move this fix to that file.
 132   base::ReplaceSubstringsAfterOffset(&handlers_spec, 0, "\\,", ",");
 133 #endif
 134
 135   std::vector<std::string> parts;
 136   base::SplitString(handlers_spec, ',', &parts);
 137   if (parts.size() % 2 != 0) {
 138     LOG(ERROR) << "Invalid value for switch " << switches::kContentHandlers
 139                << ": must be a comma-separated list of mimetype/url pairs."
 140                << handlers_spec;
 141     return;
 142   }
 143
 144   for (size_t i = 0; i < parts.size(); i += 2) {
 145     GURL url(parts[i + 1]);
 146     if (!url.is_valid()) {
 147       LOG(ERROR) << "Invalid value for switch " << switches::kContentHandlers
 148                  << ": '" << parts[i + 1] << "' is not a valid URL.";
 149       return;
 150     }
 151     // TODO(eseidel): We should also validate that the mimetype is valid
 152     // net/base/mime_util.h could do this, but we don't want to depend on net.
 153     manager->RegisterContentHandler(parts[i], url);
 154   }
 155 }
 156
 157 void InitNativeOptions(shell::ApplicationManager* manager,
 158                        const base::CommandLine& command_line) {
 159   std::vector<std::string> force_in_process_url_list;
 160   base::SplitString(command_line.GetSwitchValueASCII(switches::kForceInProcess),
 161                     ',', &force_in_process_url_list);
 162   for (const auto& force_in_process_url : force_in_process_url_list) {
 163     GURL gurl(force_in_process_url);
 164     if (!gurl.is_valid()) {
 165       LOG(ERROR) << "Invalid value for switch " << switches::kForceInProcess
 166                  << ": '" << force_in_process_url << "'is not a valid URL.";
 167       return;
 168     }
 169
 170     shell::NativeRunnerFactory::Options options;
 171     options.force_in_process = true;
 172     manager->SetNativeOptionsForURL(options, gurl);
 173   }
 174 }
 175
 176 void InitDevToolsServiceIfNeeded(shell::ApplicationManager* manager,
 177                                  const base::CommandLine& command_line) {
 178   if (!command_line.HasSwitch(devtools_service::kRemoteDebuggingPort))
 179     return;
 180
 181   std::string port_str =
 182       command_line.GetSwitchValueASCII(devtools_service::kRemoteDebuggingPort);
 183   unsigned port;
 184   if (!base::StringToUint(port_str, &port) || port > 65535) {
 185     LOG(ERROR) << "Invalid value for switch "
 186                << devtools_service::kRemoteDebuggingPort << ": '" << port_str
 187                << "' is not a valid port number.";
 188     return;
 189   }
 190
 191   ServiceProviderPtr devtools_service_provider;
 192   URLRequestPtr request(URLRequest::New());
 193   request->url = "mojo:devtools_service";
 194   manager->ConnectToApplication(
 195       nullptr, request.Pass(), std::string(), GURL("mojo:shell"),
 196       GetProxy(&devtools_service_provider), nullptr,
 197       shell::GetPermissiveCapabilityFilter(), base::Closure());
 198
 199   devtools_service::DevToolsCoordinatorPtr devtools_coordinator;
 200   devtools_service_provider->ConnectToService(
 201       devtools_service::DevToolsCoordinator::Name_,
 202       GetProxy(&devtools_coordinator).PassMessagePipe());
 203   devtools_coordinator->Initialize(static_cast<uint16_t>(port));
 204 }
 205
 206 class TracingServiceProvider : public ServiceProvider {
 207  public:
 208   explicit TracingServiceProvider(InterfaceRequest<ServiceProvider> request)
 209       : binding_(this, request.Pass()) {}
 210   ~TracingServiceProvider() override {}
 211
 212   void ConnectToService(const String& service_name,
 213                         ScopedMessagePipeHandle client_handle) override {
 214     if (service_name == tracing::TraceController::Name_) {
 215       new TraceControllerImpl(
 216           MakeRequest<tracing::TraceController>(client_handle.Pass()));
 217     }
 218   }
 219
 220  private:
 221   StrongBinding<ServiceProvider> binding_;
 222
 223   DISALLOW_COPY_AND_ASSIGN(TracingServiceProvider);
 224 };
 225
 226 }  // namespace
 227
 228 Context::Context() : application_manager_(this) {
 229   DCHECK(!base::MessageLoop::current());
 230
 231   // By default assume that the local apps reside alongside the shell.
 232   // TODO(ncbray): really, this should be passed in rather than defaulting.
 233   // This default makes sense for desktop but not Android.
 234   base::FilePath shell_dir;
 235   PathService::Get(base::DIR_MODULE, &shell_dir);
 236   SetShellFileRoot(shell_dir);
 237
 238   base::FilePath cwd;
 239   PathService::Get(base::DIR_CURRENT, &cwd);
 240   SetCommandLineCWD(cwd);
 241 }
 242
 243 Context::~Context() {
 244   DCHECK(!base::MessageLoop::current());
 245 }
 246
 247 // static
 248 void Context::EnsureEmbedderIsInitialized() {
 249   static base::LazyInstance<Setup>::Leaky setup = LAZY_INSTANCE_INITIALIZER;
 250   setup.Get();
 251 }
 252
 253 void Context::SetShellFileRoot(const base::FilePath& path) {
 254   shell_file_root_ =
 255       util::AddTrailingSlashIfNeeded(util::FilePathToFileURL(path));
 256 }
 257
 258 GURL Context::ResolveShellFileURL(const std::string& path) {
 259   return shell_file_root_.Resolve(path);
 260 }
 261
 262 void Context::SetCommandLineCWD(const base::FilePath& path) {
 263   command_line_cwd_ =
 264       util::AddTrailingSlashIfNeeded(util::FilePathToFileURL(path));
 265 }
 266
 267 GURL Context::ResolveCommandLineURL(const std::string& path) {
 268   return command_line_cwd_.Resolve(path);
 269 }
 270
 271 bool Context::Init() {
 272   TRACE_EVENT0("mojo_shell", "Context::Init");
 273   const base::CommandLine& command_line =
 274       *base::CommandLine::ForCurrentProcess();
 275
 276   EnsureEmbedderIsInitialized();
 277   task_runners_.reset(
 278       new TaskRunners(base::MessageLoop::current()->task_runner()));
 279
 280   // TODO(vtl): Probably these failures should be checked before |Init()|, and
 281   // this function simply shouldn't fail.
 282   if (!shell_file_root_.is_valid())
 283     return false;
 284   if (!ConfigureURLMappings(command_line, this))
 285     return false;
 286
 287   // TODO(vtl): This should be MASTER, not NONE.
 288   embedder::InitIPCSupport(
 289       embedder::ProcessType::NONE, task_runners_->shell_runner(), this,
 290       task_runners_->io_runner(), embedder::ScopedPlatformHandle());
 291
 292   scoped_ptr<shell::NativeRunnerFactory> runner_factory;
 293   if (command_line.HasSwitch(switches::kEnableMultiprocess))
 294     runner_factory.reset(new OutOfProcessNativeRunnerFactory(this));
 295   else
 296     runner_factory.reset(new InProcessNativeRunnerFactory(this));
 297   application_manager_.set_blocking_pool(task_runners_->blocking_pool());
 298   application_manager_.set_native_runner_factory(runner_factory.Pass());
 299   application_manager_.set_disable_cache(
 300       base::CommandLine::ForCurrentProcess()->HasSwitch(
 301           switches::kDisableCache));
 302
 303   InitContentHandlers(&application_manager_, command_line);
 304   InitNativeOptions(&application_manager_, command_line);
 305
 306   ServiceProviderPtr tracing_service_provider_ptr;
 307   new TracingServiceProvider(GetProxy(&tracing_service_provider_ptr));
 308   mojo::URLRequestPtr request(mojo::URLRequest::New());
 309   request->url = mojo::String::From("mojo:tracing");
 310   application_manager_.ConnectToApplication(
 311       nullptr, request.Pass(), std::string(), GURL(""), nullptr,
 312       tracing_service_provider_ptr.Pass(),
 313       shell::GetPermissiveCapabilityFilter(), base::Closure());
 314
 315   InitDevToolsServiceIfNeeded(&application_manager_, command_line);
 316
 317   return true;
 318 }
 319
 320 void Context::Shutdown() {
 321   TRACE_EVENT0("mojo_shell", "Context::Shutdown");
 322   DCHECK_EQ(base::MessageLoop::current()->task_runner(),
 323             task_runners_->shell_runner());
 324   embedder::ShutdownIPCSupport();
 325   // We'll quit when we get OnShutdownComplete().
 326   base::MessageLoop::current()->Run();
 327 }
 328
 329 GURL Context::ResolveMappings(const GURL& url) {
 330   return url_resolver_.ApplyMappings(url);
 331 }
 332
 333 GURL Context::ResolveMojoURL(const GURL& url) {
 334   return url_resolver_.ResolveMojoURL(url);
 335 }
 336
 337 bool Context::CreateFetcher(
 338     const GURL& url,
 339     const shell::Fetcher::FetchCallback& loader_callback) {
 340   return false;
 341 }
 342
 343 void Context::OnShutdownComplete() {
 344   DCHECK_EQ(base::MessageLoop::current()->task_runner(),
 345             task_runners_->shell_runner());
 346   base::MessageLoop::current()->Quit();
 347 }
 348
 349 void Context::Run(const GURL& url) {
 350   DCHECK(app_complete_callback_.is_null());
 351   ServiceProviderPtr services;
 352   ServiceProviderPtr exposed_services;
 353
 354   app_urls_.insert(url);
 355   mojo::URLRequestPtr request(mojo::URLRequest::New());
 356   request->url = mojo::String::From(url.spec());
 357   application_manager_.ConnectToApplication(
 358       nullptr, request.Pass(), std::string(), GURL(), GetProxy(&services),
 359       exposed_services.Pass(), shell::GetPermissiveCapabilityFilter(),
 360       base::Bind(&Context::OnApplicationEnd, base::Unretained(this), url));
 361 }
 362
 363 void Context::RunCommandLineApplication(const base::Closure& callback) {
 364   DCHECK(app_urls_.empty());
 365   DCHECK(app_complete_callback_.is_null());
 366   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 367   base::CommandLine::StringVector args = command_line->GetArgs();
 368   for (size_t i = 0; i < args.size(); ++i) {
 369     GURL possible_app(args[i]);
 370     if (possible_app.SchemeIs("mojo")) {
 371       Run(possible_app);
 372       app_complete_callback_ = callback;
 373       break;
 374     }
 375   }
 376 }
 377
 378 void Context::OnApplicationEnd(const GURL& url) {
 379   if (app_urls_.find(url) != app_urls_.end()) {
 380     app_urls_.erase(url);
 381     if (app_urls_.empty() && base::MessageLoop::current()->is_running()) {
 382       DCHECK_EQ(base::MessageLoop::current()->task_runner(),
 383                 task_runners_->shell_runner());
 384       if (app_complete_callback_.is_null()) {
 385         base::MessageLoop::current()->Quit();
 386       } else {
 387         app_complete_callback_.Run();
 388       }
 389     }
 390   }
 391 }
 392
 393 }  // namespace runner
 394 }  // namespace mojo