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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 "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;
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";
const double kMinimumReportingInterval = 250.0;
class DevToolsTraceSinkProxy : public TracingController::TraceDataSink {
public:
explicit DevToolsTraceSinkProxy(base::WeakPtr<TracingHandler> handler)
: tracing_handler_(handler) {}
void AddTraceChunk(const std::string& chunk) override {
if (TracingHandler* h = tracing_handler_.get())
h->OnTraceDataCollected(chunk);
}
void Close() override {
if (TracingHandler* h = tracing_handler_.get())
h->OnTraceComplete();
}
private:
~DevToolsTraceSinkProxy() override {}
base::WeakPtr<TracingHandler> tracing_handler_;
};
} // namespace
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);
}
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() {
client_->TracingComplete(TracingCompleteParams::Create());
}
Response TracingHandler::Start(DevToolsCommandId command_id,
const std::string* categories,
const std::string* options_str,
const double* buffer_usage_reporting_interval) {
if (is_recording_)
return Response::InternalError("Tracing is already started");
is_recording_ = true;
base::debug::TraceOptions options = TraceOptionsFromString(options_str);
base::debug::CategoryFilter filter(categories ? *categories : std::string());
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(
filter,
options,
TracingController::EnableRecordingDoneCallback());
return Response::FallThrough();
}
TracingController::GetInstance()->EnableRecording(
filter,
options,
base::Bind(&TracingHandler::OnRecordingEnabled,
weak_factory_.GetWeakPtr(),
command_id));
return Response::OK();
}
Response TracingHandler::End(DevToolsCommandId command_id) {
if (!is_recording_)
return Response::InternalError("Tracing is not started");
DisableRecording(false);
// If inspected target is a render process Tracing.end will be handled by
// tracing agent in the renderer.
return target_ == Renderer ? Response::FallThrough() : Response::OK();
}
Response TracingHandler::GetCategories(DevToolsCommandId command_id) {
TracingController::GetInstance()->GetCategories(
base::Bind(&TracingHandler::OnCategoriesReceived,
weak_factory_.GetWeakPtr(),
command_id));
return Response::OK();
}
void TracingHandler::OnRecordingEnabled(DevToolsCommandId command_id) {
client_->SendStartResponse(command_id, StartResponse::Create());
}
void TracingHandler::OnBufferUsage(float percent_full,
size_t approximate_event_count) {
// TODO(crbug426117): remove set_value once all clients have switched to
// the new interface of the event.
client_->BufferUsage(BufferUsageParams::Create()
->set_value(percent_full)
->set_percent_full(percent_full)
->set_event_count(approximate_event_count));
}
void TracingHandler::OnCategoriesReceived(
DevToolsCommandId command_id,
const std::set<std::string>& category_set) {
std::vector<std::string> categories;
for (const std::string& category : category_set)
categories.push_back(category);
client_->SendGetCategoriesResponse(command_id,
GetCategoriesResponse::Create()->set_categories(categories));
}
base::debug::TraceOptions TracingHandler::TraceOptionsFromString(
const std::string* options) {
base::debug::TraceOptions ret;
if (!options)
return ret;
std::vector<std::string> split;
std::vector<std::string>::iterator iter;
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::GetTraceBufferUsage),
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 ? nullptr : new DevToolsTraceSinkProxy(weak_factory_.GetWeakPtr()));
}
} // namespace tracing
} // namespace devtools
} // namespace content
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