[DevTools] Migrate DevToolsTracingHandler to generated handler.

content/browser/devtools/protocol/tracing_handler.cc

 // 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 "content/browser/devtools/protocol/tracing_handler.h"
 
+#include <cmath>
+
+#include "base/bind.h"
+#include "base/debug/trace_event_impl.h"
+#include "base/strings/string_split.h"
+#include "base/strings/stringprintf.h"
+#include "base/time/time.h"
+#include "base/timer/timer.h"
+
 namespace content {
 namespace devtools {
 namespace tracing {
 
 typedef DevToolsProtocolClient::Response Response;
 
-TracingHandler::TracingHandler() {
+namespace {
+
+const char kRecordUntilFull[]   = "record-until-full";
+const char kRecordContinuously[] = "record-continuously";
+const char kRecordAsMuchAsPossible[] = "record-as-much-as-possible";
+const char kEnableSampling[] = "enable-sampling";
+
+class DevToolsTraceSinkProxy : public TracingController::TraceDataSink {
+ public:
+  explicit DevToolsTraceSinkProxy(base::WeakPtr<TracingHandler> handler)
+      : tracing_handler_(handler) {}
+
+  virtual void AddTraceChunk(const std::string& chunk) override {
+    if (TracingHandler* h = tracing_handler_.get())
+      h->OnTraceDataCollected(chunk);
+  }
+  virtual void Close() override {
+    if (TracingHandler* h = tracing_handler_.get())
+      h->OnTraceComplete();
+  }
+
+ private:
+  virtual ~DevToolsTraceSinkProxy() {}
+
+  base::WeakPtr<TracingHandler> tracing_handler_;
+};
+
+}  // namespace
+
+const char* TracingHandler::kDefaultCategories =
+    "-*,disabled-by-default-devtools.timeline*";
+const double TracingHandler::kDefaultReportingInterval = 1000.0;
+const double TracingHandler::kMinimumReportingInterval = 250.0;
+
+TracingHandler::TracingHandler(TracingHandler::Target target)
+    : target_(target),
+      is_recording_(false),
+      weak_factory_(this) {
 }
 
 TracingHandler::~TracingHandler() {
 }
 
 void TracingHandler::SetClient(scoped_ptr<Client> client) {
   client_.swap(client);
 }
 
-Response TracingHandler::Start(const std::string& categories,
-                               const std::string& options,
-                               const double* buffer_usage_reporting_interval) {
-  return Response::FallThrough();
+void TracingHandler::Detached() {
+  if (is_recording_)
+    DisableRecording(true);
+}
+
+void TracingHandler::OnTraceDataCollected(const std::string& trace_fragment) {
+  // Hand-craft protocol notification message so we can substitute JSON
+  // that we already got as string as a bare object, not a quoted string.
+  std::string message(
+      "{ \"method\": \"Tracing.dataCollected\", \"params\": { \"value\": [");
+  const size_t messageSuffixSize = 10;
+  message.reserve(message.size() + trace_fragment.size() + messageSuffixSize);
+  message += trace_fragment;
+  message += "] } }", client_->SendRawMessage(message);
+}
+
+void TracingHandler::OnTraceComplete() {
+  TracingCompleteParams params;
+  client_->TracingComplete(params);
 }
 
 scoped_refptr<DevToolsProtocol::Response> TracingHandler::Start(
     const std::string& categories,
-    const std::string& options,
+    const std::string& options_str,
     const double* buffer_usage_reporting_interval,
     scoped_refptr<DevToolsProtocol::Command> command) {
-  return NULL;
-}
+  if (is_recording_)
+    return command->InternalErrorResponse("Tracing is already started");
+  is_recording_ = true;
 
-Response TracingHandler::End() {
-  return Response::FallThrough();
+  base::debug::TraceOptions options = TraceOptionsFromString(options_str);
+  if (buffer_usage_reporting_interval)
+    SetupTimer(*buffer_usage_reporting_interval);
+
+  // If inspected target is a render process Tracing.start will be handled by
+  // tracing agent in the renderer.
+  if (target_ == Renderer) {
+    TracingController::GetInstance()->EnableRecording(
+        base::debug::CategoryFilter(categories),
+        options,
+        TracingController::EnableRecordingDoneCallback());
+    return NULL;

[vkuzkokov, 2014/10/07 13:36:07]

Consider using nullptr in this file.

[dgozman, 2014/10/14 12:42:22]

Done.

+  }
+
+  TracingController::GetInstance()->EnableRecording(
+      base::debug::CategoryFilter(categories),
+      options,
+      base::Bind(&TracingHandler::OnRecordingEnabled,
+                 weak_factory_.GetWeakPtr(),
+                 command));
+  return command->AsyncResponsePromise();
 }
 
 scoped_refptr<DevToolsProtocol::Response> TracingHandler::End(
     scoped_refptr<DevToolsProtocol::Command> command) {
-  return NULL;
+  if (!is_recording_)
+    return command->InternalErrorResponse("Tracing is not started");
+  DisableRecording(false);
+  // If inspected target is a render process Tracing.end will be handled by
+  // tracing agent in the renderer.
+  if (target_ == Renderer)
+    return NULL;
+  return command->SuccessResponse(NULL);
 }
 
 scoped_refptr<DevToolsProtocol::Response> TracingHandler::GetCategories(
     scoped_refptr<DevToolsProtocol::Command> command) {
-  return NULL;
+  TracingController::GetInstance()->GetCategories(
+      base::Bind(&TracingHandler::OnCategoriesReceived,
+                 weak_factory_.GetWeakPtr(),
+                 command));
+  return command->AsyncResponsePromise();
+}
+
+void TracingHandler::OnRecordingEnabled(
+    scoped_refptr<DevToolsProtocol::Command> command) {
+  StartResponse response;
+  client_->SendStartResponse(command, response);
+}
+
+void TracingHandler::OnBufferUsage(float usage) {
+  BufferUsageParams params;
+  params.set_value(usage);
+  client_->BufferUsage(params);
+}
+
+void TracingHandler::OnCategoriesReceived(
+    scoped_refptr<DevToolsProtocol::Command> command,
+    const std::set<std::string>& category_set) {
+  std::vector<std::string> categories;
+  for (const auto& category : category_set)

[caseq, 2014/10/13 13:01:27]

consider using range constructor for categories instead?

[dgozman, 2014/10/14 12:42:22]

Done.

+    categories.push_back(category);
+
+  GetCategoriesResponse response;
+  response.set_categories(categories);
+  client_->SendGetCategoriesResponse(command, response);
+}
+
+base::debug::TraceOptions TracingHandler::TraceOptionsFromString(
+    const std::string& options) {
+  std::vector<std::string> split;
+  std::vector<std::string>::iterator iter;
+  base::debug::TraceOptions ret;
+
+  base::SplitString(options, ',', &split);
+  for (iter = split.begin(); iter != split.end(); ++iter) {
+    if (*iter == kRecordUntilFull) {
+      ret.record_mode = base::debug::RECORD_UNTIL_FULL;
+    } else if (*iter == kRecordContinuously) {
+      ret.record_mode = base::debug::RECORD_CONTINUOUSLY;
+    } else if (*iter == kRecordAsMuchAsPossible) {
+      ret.record_mode = base::debug::RECORD_AS_MUCH_AS_POSSIBLE;
+    } else if (*iter == kEnableSampling) {
+      ret.enable_sampling = true;
+    }
+  }
+  return ret;
+}
+
+void TracingHandler::SetupTimer(double usage_reporting_interval) {
+  if (usage_reporting_interval == 0) return;
+
+  if (usage_reporting_interval < kMinimumReportingInterval)
+      usage_reporting_interval = kMinimumReportingInterval;
+
+  base::TimeDelta interval = base::TimeDelta::FromMilliseconds(
+      std::ceil(usage_reporting_interval));
+  buffer_usage_poll_timer_.reset(new base::Timer(
+      FROM_HERE,
+      interval,
+      base::Bind(
+          base::IgnoreResult(&TracingController::GetTraceBufferPercentFull),
+          base::Unretained(TracingController::GetInstance()),
+          base::Bind(&TracingHandler::OnBufferUsage,
+                     weak_factory_.GetWeakPtr())),
+      true));
+  buffer_usage_poll_timer_->Reset();
+}
+
+void TracingHandler::DisableRecording(bool abort) {
+  is_recording_ = false;
+  buffer_usage_poll_timer_.reset();
+  TracingController::GetInstance()->DisableRecording(
+      abort ? NULL : new DevToolsTraceSinkProxy(weak_factory_.GetWeakPtr()));
 }
 
 }  // namespace tracing
 }  // namespace devtools
 }  // namespace content