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::kOrigin)) {
  66     base_url = GURL(command_line.GetSwitchValueASCII(switches::kOrigin));
  67   } else if (!command_line.HasSwitch(switches::kUseUpdater)) {
  68     // Use the shell's file root if the base was not specified.
  69     base_url = context->ResolveShellFileURL("");
  70   }
  71
  72   if (base_url.is_valid())
  73     resolver->SetMojoBaseURL(base_url);
  74
  75   // The network service and updater must be loaded from the filesystem.
  76   // This mapping is done before the command line URL mapping are processed, so
  77   // that it can be overridden.
  78   resolver->AddURLMapping(GURL("mojo:network_service"),
  79                           context->ResolveShellFileURL(
  80                               "file:network_service/network_service.mojo"));
  81   resolver->AddURLMapping(
  82       GURL("mojo:updater"),
  83       context->ResolveShellFileURL("file:updater/updater.mojo"));
  84
  85   // Command line URL mapping.
  86   std::vector<URLResolver::OriginMapping> origin_mappings =
  87       URLResolver::GetOriginMappings(command_line.argv());
  88   for (const auto& origin_mapping : origin_mappings)
  89     resolver->AddOriginMapping(GURL(origin_mapping.origin),
  90                                GURL(origin_mapping.base_url));
  91
  92   if (command_line.HasSwitch(switches::kURLMappings)) {
  93     const std::string mappings =
  94         command_line.GetSwitchValueASCII(switches::kURLMappings);
  95
  96     base::StringPairs pairs;
  97     if (!base::SplitStringIntoKeyValuePairs(mappings, '=', ',', &pairs))
  98       return false;
  99     using StringPair = std::pair<std::string, std::string>;
 100     for (const StringPair& pair : pairs) {
 101       const GURL from(pair.first);
 102       const GURL to = context->ResolveCommandLineURL(pair.second);
 103       if (!from.is_valid() || !to.is_valid())
 104         return false;
 105       resolver->AddURLMapping(from, to);
 106     }
 107   }
 108
 109   return true;
 110 }
 111
 112 void InitContentHandlers(shell::ApplicationManager* manager,
 113                          const base::CommandLine& command_line) {
 114   // Default content handlers.
 115   manager->RegisterContentHandler("application/pdf", GURL("mojo:pdf_viewer"));
 116   manager->RegisterContentHandler("image/png", GURL("mojo:png_viewer"));
 117   manager->RegisterContentHandler("text/html", GURL("mojo:html_viewer"));
 118
 119   // Command-line-specified content handlers.
 120   std::string handlers_spec =
 121       command_line.GetSwitchValueASCII(switches::kContentHandlers);
 122   if (handlers_spec.empty())
 123     return;
 124
 125 #if defined(OS_ANDROID)
 126   // TODO(eseidel): On Android we pass command line arguments is via the
 127   // 'parameters' key on the intent, which we specify during 'am shell start'
 128   // via --esa, however that expects comma-separated values and says:
 129   //   am shell --help:
 130   //     [--esa <EXTRA_KEY> <EXTRA_STRING_VALUE>[,<EXTRA_STRING_VALUE...]]
 131   //     (to embed a comma into a string escape it using "\,")
 132   // Whatever takes 'parameters' and constructs a CommandLine is failing to
 133   // un-escape the commas, we need to move this fix to that file.
 134   ReplaceSubstringsAfterOffset(&handlers_spec, 0, "\\,", ",");
 135 #endif
 136
 137   std::vector<std::string> parts;
 138   base::SplitString(handlers_spec, ',', &parts);
 139   if (parts.size() % 2 != 0) {
 140     LOG(ERROR) << "Invalid value for switch " << switches::kContentHandlers
 141                << ": must be a comma-separated list of mimetype/url pairs."
 142                << handlers_spec;
 143     return;
 144   }
 145
 146   for (size_t i = 0; i < parts.size(); i += 2) {
 147     GURL url(parts[i + 1]);
 148     if (!url.is_valid()) {
 149       LOG(ERROR) << "Invalid value for switch " << switches::kContentHandlers
 150                  << ": '" << parts[i + 1] << "' is not a valid URL.";
 151       return;
 152     }
 153     // TODO(eseidel): We should also validate that the mimetype is valid
 154     // net/base/mime_util.h could do this, but we don't want to depend on net.
 155     manager->RegisterContentHandler(parts[i], url);
 156   }
 157 }
 158
 159 void InitNativeOptions(shell::ApplicationManager* manager,
 160                        const base::CommandLine& command_line) {
 161   std::vector<std::string> force_in_process_url_list;
 162   base::SplitString(command_line.GetSwitchValueASCII(switches::kForceInProcess),
 163                     ',', &force_in_process_url_list);
 164   for (const auto& force_in_process_url : force_in_process_url_list) {
 165     GURL gurl(force_in_process_url);
 166     if (!gurl.is_valid()) {
 167       LOG(ERROR) << "Invalid value for switch " << switches::kForceInProcess
 168                  << ": '" << force_in_process_url << "'is not a valid URL.";
 169       return;
 170     }
 171
 172     shell::NativeRunnerFactory::Options options;
 173     options.force_in_process = true;
 174     manager->SetNativeOptionsForURL(options, gurl);
 175   }
 176 }
 177
 178 void InitDevToolsServiceIfNeeded(shell::ApplicationManager* manager,
 179                                  const base::CommandLine& command_line) {
 180   if (!command_line.HasSwitch(devtools_service::kRemoteDebuggingPort))
 181     return;
 182
 183   std::string port_str =
 184       command_line.GetSwitchValueASCII(devtools_service::kRemoteDebuggingPort);
 185   unsigned port;
 186   if (!base::StringToUint(port_str, &port) || port > 65535) {
 187     LOG(ERROR) << "Invalid value for switch "
 188                << devtools_service::kRemoteDebuggingPort << ": '" << port_str
 189                << "' is not a valid port number.";
 190     return;
 191   }
 192
 193   ServiceProviderPtr devtools_service_provider;
 194   URLRequestPtr request(URLRequest::New());
 195   request->url = "mojo:devtools_service";
 196   manager->ConnectToApplication(request.Pass(), GURL("mojo:shell"),
 197                                 GetProxy(&devtools_service_provider), nullptr,
 198                                 base::Closure());
 199
 200   devtools_service::DevToolsCoordinatorPtr devtools_coordinator;
 201   devtools_service_provider->ConnectToService(
 202       devtools_service::DevToolsCoordinator::Name_,
 203       GetProxy(&devtools_coordinator).PassMessagePipe());
 204   devtools_coordinator->Initialize(static_cast<uint16_t>(port));
 205 }
 206
 207 class TracingServiceProvider : public ServiceProvider {
 208  public:
 209   explicit TracingServiceProvider(InterfaceRequest<ServiceProvider> request)
 210       : binding_(this, request.Pass()) {}
 211   ~TracingServiceProvider() override {}
 212
 213   void ConnectToService(const String& service_name,
 214                         ScopedMessagePipeHandle client_handle) override {
 215     if (service_name == tracing::TraceController::Name_) {
 216       new TraceControllerImpl(
 217           MakeRequest<tracing::TraceController>(client_handle.Pass()));
 218     }
 219   }
 220
 221  private:
 222   StrongBinding<ServiceProvider> binding_;
 223
 224   DISALLOW_COPY_AND_ASSIGN(TracingServiceProvider);
 225 };
 226
 227 }  // namespace
 228
 229 Context::Context() : application_manager_(this) {
 230   DCHECK(!base::MessageLoop::current());
 231
 232   // By default assume that the local apps reside alongside the shell.
 233   // TODO(ncbray): really, this should be passed in rather than defaulting.
 234   // This default makes sense for desktop but not Android.
 235   base::FilePath shell_dir;
 236   PathService::Get(base::DIR_MODULE, &shell_dir);
 237   SetShellFileRoot(shell_dir);
 238
 239   base::FilePath cwd;
 240   PathService::Get(base::DIR_CURRENT, &cwd);
 241   SetCommandLineCWD(cwd);
 242 }
 243
 244 Context::~Context() {
 245   DCHECK(!base::MessageLoop::current());
 246 }
 247
 248 // static
 249 void Context::EnsureEmbedderIsInitialized() {
 250   static base::LazyInstance<Setup>::Leaky setup = LAZY_INSTANCE_INITIALIZER;
 251   setup.Get();
 252 }
 253
 254 void Context::SetShellFileRoot(const base::FilePath& path) {
 255   shell_file_root_ =
 256       util::AddTrailingSlashIfNeeded(util::FilePathToFileURL(path));
 257 }
 258
 259 GURL Context::ResolveShellFileURL(const std::string& path) {
 260   return shell_file_root_.Resolve(path);
 261 }
 262
 263 void Context::SetCommandLineCWD(const base::FilePath& path) {
 264   command_line_cwd_ =
 265       util::AddTrailingSlashIfNeeded(util::FilePathToFileURL(path));
 266 }
 267
 268 GURL Context::ResolveCommandLineURL(const std::string& path) {
 269   return command_line_cwd_.Resolve(path);
 270 }
 271
 272 bool Context::Init() {
 273   TRACE_EVENT0("mojo_shell", "Context::Init");
 274   const base::CommandLine& command_line =
 275       *base::CommandLine::ForCurrentProcess();
 276
 277   EnsureEmbedderIsInitialized();
 278   task_runners_.reset(
 279       new TaskRunners(base::MessageLoop::current()->task_runner()));
 280
 281   // TODO(vtl): Probably these failures should be checked before |Init()|, and
 282   // this function simply shouldn't fail.
 283   if (!shell_file_root_.is_valid())
 284     return false;
 285   if (!ConfigureURLMappings(command_line, this))
 286     return false;
 287
 288   // TODO(vtl): This should be MASTER, not NONE.
 289   embedder::InitIPCSupport(
 290       embedder::ProcessType::NONE, task_runners_->shell_runner(), this,
 291       task_runners_->io_runner(), embedder::ScopedPlatformHandle());
 292
 293   scoped_ptr<shell::NativeRunnerFactory> runner_factory;
 294   if (command_line.HasSwitch(switches::kEnableMultiprocess))
 295     runner_factory.reset(new OutOfProcessNativeRunnerFactory(this));
 296   else
 297     runner_factory.reset(new InProcessNativeRunnerFactory(this));
 298   application_manager_.set_blocking_pool(task_runners_->blocking_pool());
 299   application_manager_.set_native_runner_factory(runner_factory.Pass());
 300   application_manager_.set_disable_cache(
 301       base::CommandLine::ForCurrentProcess()->HasSwitch(
 302           switches::kDisableCache));
 303
 304   InitContentHandlers(&application_manager_, command_line);
 305   InitNativeOptions(&application_manager_, command_line);
 306
 307   ServiceProviderPtr tracing_service_provider_ptr;
 308   new TracingServiceProvider(GetProxy(&tracing_service_provider_ptr));
 309   mojo::URLRequestPtr request(mojo::URLRequest::New());
 310   request->url = mojo::String::From("mojo:tracing");
 311   application_manager_.ConnectToApplication(request.Pass(), GURL(""), nullptr,
 312                                             tracing_service_provider_ptr.Pass(),
 313                                             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   ServiceProviderPtr services;
 351   ServiceProviderPtr exposed_services;
 352
 353   app_urls_.insert(url);
 354   mojo::URLRequestPtr request(mojo::URLRequest::New());
 355   request->url = mojo::String::From(url.spec());
 356   application_manager_.ConnectToApplication(
 357       request.Pass(), GURL(), GetProxy(&services), exposed_services.Pass(),
 358       base::Bind(&Context::OnApplicationEnd, base::Unretained(this), url));
 359 }
 360
 361 void Context::RunCommandLineApplication() {
 362   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 363   base::CommandLine::StringVector args = command_line->GetArgs();
 364   for (size_t i = 0; i < args.size(); ++i) {
 365     GURL possible_app(args[i]);
 366     if (possible_app.SchemeIs("mojo")) {
 367       Run(possible_app);
 368       break;
 369     }
 370   }
 371 }
 372
 373 void Context::OnApplicationEnd(const GURL& url) {
 374   if (app_urls_.find(url) != app_urls_.end()) {
 375     app_urls_.erase(url);
 376     if (app_urls_.empty() && base::MessageLoop::current()->is_running()) {
 377       DCHECK_EQ(base::MessageLoop::current()->task_runner(),
 378                 task_runners_->shell_runner());
 379       base::MessageLoop::current()->Quit();
 380     }
 381   }
 382 }
 383
 384 }  // namespace runner
 385 }  // namespace mojo