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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.
#ifndef GRPC_SRC_CORE_LIB_DEBUG_EVENT_LOG_H
#define GRPC_SRC_CORE_LIB_DEBUG_EVENT_LOG_H
#include <grpc/support/port_platform.h>
#include <stdint.h>
#include <atomic>
#include <util/generic/string.h>
#include <util/string/cast.h>
#include <vector>
#include "y_absl/base/thread_annotations.h"
#include "y_absl/strings/string_view.h"
#include "y_absl/types/span.h"
#include "src/core/lib/gpr/time_precise.h"
#include "src/core/lib/gprpp/per_cpu.h"
#include "src/core/lib/gprpp/sync.h"
namespace grpc_core {
// Debug utility to collect a burst of events and then later log them as a
// detailed sequence.
// Collects (timestamp, counter-name, delta) and gives back a csv with
// timestamps and accumulated values for each counter in separate columns.
class EventLog {
public:
EventLog() = default;
~EventLog();
EventLog(const EventLog&) = delete;
EventLog& operator=(const EventLog&) = delete;
void BeginCollection();
TString EndCollectionAndReportCsv(
y_absl::Span<const y_absl::string_view> columns);
static void Append(y_absl::string_view event, int64_t delta) {
EventLog* log = g_instance_.load(std::memory_order_acquire);
if (log == nullptr) return;
log->AppendInternal(event, delta);
}
private:
struct Entry {
gpr_cycle_counter when;
y_absl::string_view event;
int64_t delta;
};
struct Fragment {
Mutex mu;
std::vector<Entry> entries Y_ABSL_GUARDED_BY(mu);
};
void AppendInternal(y_absl::string_view event, int64_t delta);
std::vector<Entry> EndCollection(
y_absl::Span<const y_absl::string_view> wanted_events);
PerCpu<Fragment> fragments_;
gpr_cycle_counter collection_begin_;
static std::atomic<EventLog*> g_instance_;
};
} // namespace grpc_core
#endif // GRPC_SRC_CORE_LIB_DEBUG_EVENT_LOG_H
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