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mojo/services/tracing/main.cc

Index: mojo/services/tracing/main.cc
diff --git a/mojo/services/tracing/main.cc b/mojo/services/tracing/main.cc
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+// Copyright 2014 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 "base/bind.h"
+#include "base/memory/scoped_vector.h"
+#include "mojo/application/application_runner_chromium.h"
+#include "mojo/common/weak_binding_set.h"
+#include "mojo/common/weak_interface_ptr_set.h"
+#include "mojo/public/c/system/main.h"
+#include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/application_impl.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "mojo/services/tracing/trace_data_sink.h"
+#include "mojo/services/tracing/tracing.mojom.h"
+
+namespace tracing {
+
+namespace {
+
+class CollectorImpl : public TraceDataCollector {
+ public:
+  CollectorImpl(mojo::InterfaceRequest<TraceDataCollector> request,
+                TraceDataSink* sink)
+      : sink_(sink), binding_(this, request.Pass()) {}
+
+  ~CollectorImpl() override {}
+
+  // tracing::TraceDataCollector implementation.
+  void DataCollected(const mojo::String& json) override {
+    sink_->AddChunk(json.To<std::string>());
+  }
+
+ private:
+  TraceDataSink* sink_;
+  mojo::Binding<TraceDataCollector> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(CollectorImpl);
+};
+
+}  // namespace
+
+class TracingApp : public mojo::ApplicationDelegate,
+                   public mojo::InterfaceFactory<TraceCoordinator>,
+                   public TraceCoordinator {
+ public:
+  TracingApp() {}
+  ~TracingApp() override {}
+
+ private:
+  // mojo::ApplicationDelegate implementation.
+  bool ConfigureIncomingConnection(
+      mojo::ApplicationConnection* connection) override {
+    connection->AddService<TraceCoordinator>(this);
+
+    // If someone connects to us they may want to use the TraceCoordinator
+    // interface and/or they may want to expose themselves to be traced. Attempt
+    // to connect to the TraceController interface to see if the application
+    // connecting to us wants to be traced. They can refuse the connection or
+    // close the pipe if not.
+    TraceControllerPtr controller_ptr;
+    connection->ConnectToService(&controller_ptr);
+    controller_ptrs_.AddInterfacePtr(controller_ptr.Pass());
+    return true;
+  }
+
+  // mojo::InterfaceFactory<TraceCoordinator> implementation.
+  void Create(mojo::ApplicationConnection* connection,
+              mojo::InterfaceRequest<TraceCoordinator> request) override {
+    coordinator_bindings_.AddBinding(this, request.Pass());
+  }
+
+  // tracing::TraceCoordinator implementation.
+  void Start(mojo::ScopedDataPipeProducerHandle stream,
+             const mojo::String& categories) override {
+    sink_.reset(new TraceDataSink(stream.Pass()));
+    controller_ptrs_.ForAllPtrs(
+        [categories, this](TraceController* controller) {
+          TraceDataCollectorPtr ptr;
+          collector_impls_.push_back(
+              new CollectorImpl(GetProxy(&ptr), sink_.get()));
+          controller->StartTracing(categories, ptr.Pass());
+        });
+  }
+  void StopAndFlush() override {
+    controller_ptrs_.ForAllPtrs(
+        [](TraceController* controller) { controller->StopTracing(); });
+
+    // TODO: We really should keep track of how many connections we have here
+    // and flush + reset the sink after we receive a EndTracing or a detect a
+    // pipe closure on all pipes.
+    base::MessageLoop::current()->PostDelayedTask(
+        FROM_HERE,
+        base::Bind(&TracingApp::AllDataCollected, base::Unretained(this)),
+        base::TimeDelta::FromSeconds(1));
+  }
+
+  void AllDataCollected() {
+    collector_impls_.clear();
+    sink_->Flush();
+  }
+
+  scoped_ptr<TraceDataSink> sink_;
+  ScopedVector<CollectorImpl> collector_impls_;
+  mojo::WeakInterfacePtrSet<TraceController> controller_ptrs_;
+  mojo::WeakBindingSet<TraceCoordinator> coordinator_bindings_;
+
+  DISALLOW_COPY_AND_ASSIGN(TracingApp);
+};
+
+}  // namespace tracing
+
+MojoResult MojoMain(MojoHandle shell_handle) {
+  mojo::ApplicationRunnerChromium runner(new tracing::TracingApp);
+  return runner.Run(shell_handle);
+}