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// Copyright 2019 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/390223051): Remove C-library calls to fix the errors.
#pragma allow_unsafe_libc_calls
#endif
#include "components/breadcrumbs/core/crash_reporter_breadcrumb_observer.h"
#include <numeric>
#include <string>
#include "base/containers/adapters.h"
#include "base/no_destructor.h"
#include "components/breadcrumbs/core/breadcrumb_manager.h"
#include "components/breadcrumbs/core/crash_reporter_breadcrumb_constants.h"
#include "components/crash/core/common/crash_key.h"
namespace breadcrumbs {
namespace {
constexpr char kEventSeparator[] = "\n";
} // namespace
CrashReporterBreadcrumbObserver::CrashReporterBreadcrumbObserver() = default;
CrashReporterBreadcrumbObserver::~CrashReporterBreadcrumbObserver() = default;
CrashReporterBreadcrumbObserver&
CrashReporterBreadcrumbObserver::GetInstance() {
static base::NoDestructor<CrashReporterBreadcrumbObserver> instance;
return *instance;
}
void CrashReporterBreadcrumbObserver::PreviousSessionEventsAdded() {
UpdateBreadcrumbEventsCrashKey();
}
void CrashReporterBreadcrumbObserver::EventAdded(const std::string& event) {
UpdateBreadcrumbEventsCrashKey();
}
void CrashReporterBreadcrumbObserver::UpdateBreadcrumbEventsCrashKey() {
const auto& breadcrumbs = BreadcrumbManager::GetInstance().GetEvents();
// Get the length of all breadcrumbs combined and preallocate the space needed
// for the combined string. This saves repeated allocations in the next loop.
const size_t event_separator_length = strlen(kEventSeparator);
const size_t breadcrumbs_string_length = std::accumulate(
breadcrumbs.begin(), breadcrumbs.end(), 0,
[event_separator_length](const size_t sum,
const std::string& breadcrumb) {
return sum + breadcrumb.length() + event_separator_length;
});
std::string breadcrumbs_string;
breadcrumbs_string.reserve(breadcrumbs_string_length);
// Concatenate breadcrumbs backwards, putting new breadcrumbs at the front, so
// that the most relevant (i.e., newest) breadcrumbs are at the top in Crash.
for (const std::string& breadcrumb : base::Reversed(breadcrumbs)) {
breadcrumbs_string += breadcrumb;
breadcrumbs_string += kEventSeparator;
}
DCHECK(breadcrumbs_string.length() == breadcrumbs_string_length);
// Enforce a maximum length to ensure the string fits in the crash report;
// this is unlikely to be needed due to the limit of `kMaxBreadcrumbs` events.
if (breadcrumbs_string.length() > kMaxDataLength)
breadcrumbs_string.resize(kMaxDataLength);
static crash_reporter::CrashKeyString<kMaxDataLength> key(
kBreadcrumbsProductDataKey);
key.Set(breadcrumbs_string);
}
} // namespace breadcrumbs
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