background_tracing_helper.cc | Explore in Territory

// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#include "third_party/blink/renderer/core/timing/background_tracing_helper.h"

#include <string_view>

#include "base/containers/span.h"
#include "base/feature_list.h"
#include "base/hash/md5.h"
#include "base/numerics/byte_conversions.h"
#include "base/rand_util.h"
#include "base/trace_event/typed_macros.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/timing/performance_mark.h"
#include "third_party/blink/renderer/platform/instrumentation/resource_coordinator/renderer_resource_coordinator.h"
#include "third_party/blink/renderer/platform/weborigin/kurl.h"
#include "third_party/blink/renderer/platform/weborigin/security_origin.h"
#include "third_party/blink/renderer/platform/wtf/text/ascii_ctype.h"
#include "third_party/blink/renderer/platform/wtf/text/number_parsing_options.h"
#include "third_party/blink/renderer/platform/wtf/text/string_operators.h"
#include "third_party/blink/renderer/platform/wtf/text/string_to_number.h"
#include "url/url_constants.h"

namespace blink {

namespace {

enum TerminationCondition { … };

// Consumes a 1-8 byte hash from the given string, and the terminator if one is
// encountered. On success, the parsed hash is output via the optional |hash|
// and the new position of the cursor is returned. On failure, nullptr is
// returned.
const char* ParseHash(const char* begin,
                      const char* end,
                      uint32_t& hash,
                      TerminationCondition termination,
                      char valid_terminator0,
                      char valid_terminator1 = 0,
                      char valid_terminator2 = 0) { … }

static constexpr char kTriggerPrefix[] = …;

bool MarkNameIsTrigger(const String& mark_name) { … }

String GenerateFullTrigger(const String& site, const String& mark_name) { … }

}  // namespace

// A thin wrapper around a SiteMarkHashMap that populates it at construction by
// parsing the relevant Finch parameters.
struct BackgroundTracingHelper::SiteMarkHashMapContainer { … };

BackgroundTracingHelper::SiteMarkHashMapContainer::SiteMarkHashMapContainer() { … }

BackgroundTracingHelper::BackgroundTracingHelper(ExecutionContext* context) { … }

BackgroundTracingHelper::~BackgroundTracingHelper() = default;

void BackgroundTracingHelper::MaybeEmitBackgroundTracingPerformanceMarkEvent(
    const PerformanceMark& mark) { … }

void BackgroundTracingHelper::Trace(Visitor*) const { … }

// static
const BackgroundTracingHelper::SiteMarkHashMap&
BackgroundTracingHelper::GetSiteMarkHashMap() { … }

// static
const BackgroundTracingHelper::MarkHashSet*
BackgroundTracingHelper::GetMarkHashSetForSiteHash(uint32_t site_hash) { … }

// static
size_t BackgroundTracingHelper::GetSequenceNumberPos(std::string_view string) { … }

// static
uint32_t BackgroundTracingHelper::MD5Hash32(std::string_view string) { … }

// static
void BackgroundTracingHelper::GetMarkHashAndSequenceNumber(
    std::string_view mark_name,
    uint32_t sequence_number_offset,
    uint32_t* mark_hash,
    uint32_t* sequence_number) { … }

// static
bool BackgroundTracingHelper::ParseBackgroundTracingPerformanceMarkHashes(
    std::string_view allow_list,
    SiteMarkHashMap& allow_listed_hashes) { … }

}  // namespace blink
chromium/third_party/blink/renderer/core/timing/background_tracing_helper.cc
