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// Copyright 2022 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <grpc/support/port_platform.h>
#include "src/core/lib/debug/event_log.h"
#include <algorithm>
#include <atomic>
#include "y_absl/strings/str_cat.h"
#include "y_absl/strings/str_join.h"
#include <grpc/support/log.h>
namespace grpc_core {
std::atomic<EventLog*> EventLog::g_instance_{nullptr};
EventLog::~EventLog() {
GPR_ASSERT(g_instance_.load(std::memory_order_acquire) != this);
}
void EventLog::BeginCollection() {
for (auto& fragment : fragments_) {
MutexLock lock(&fragment.mu);
fragment.entries.clear();
}
collection_begin_ = gpr_get_cycle_counter();
g_instance_.store(this, std::memory_order_release);
Append("logging", 1);
}
std::vector<EventLog::Entry> EventLog::EndCollection(
y_absl::Span<const y_absl::string_view> wanted_events) {
Append("logging", -1);
g_instance_.store(nullptr, std::memory_order_release);
std::vector<Entry> result;
for (auto& fragment : fragments_) {
MutexLock lock(&fragment.mu);
for (const auto& entry : fragment.entries) {
if (std::find(wanted_events.begin(), wanted_events.end(), entry.event) !=
wanted_events.end()) {
result.push_back(entry);
}
}
fragment.entries.clear();
}
std::stable_sort(
result.begin(), result.end(),
[](const Entry& a, const Entry& b) { return a.when < b.when; });
return result;
}
void EventLog::AppendInternal(y_absl::string_view event, int64_t delta) {
auto& fragment = fragments_.this_cpu();
MutexLock lock(&fragment.mu);
fragment.entries.push_back({gpr_get_cycle_counter(), event, delta});
}
TString EventLog::EndCollectionAndReportCsv(
y_absl::Span<const y_absl::string_view> columns) {
auto events = EndCollection(columns);
std::vector<int64_t> values(columns.size(), 0);
TString result =
y_absl::StrCat("timestamp,", y_absl::StrJoin(columns, ","), "\n");
for (const auto& entry : events) {
auto idx = std::find(columns.begin(), columns.end(), entry.event) -
columns.begin();
values[idx] += entry.delta;
y_absl::StrAppend(&result, entry.when - collection_begin_, ",",
y_absl::StrJoin(values, ","), "\n");
}
return result;
}
} // namespace grpc_core
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