/*
 *
 * Copyright 2017 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.
 *
 */

/* Test out various metadata handling primitives */

#include <benchmark/benchmark.h>
#include <grpc/grpc.h>

#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/transport/metadata.h"
#include "src/core/lib/transport/static_metadata.h"

#include "test/cpp/microbenchmarks/helpers.h"
#include "test/cpp/util/test_config.h"

static void BM_SliceFromStatic(benchmark::State& state) {
  TrackCounters track_counters;
  for (auto _ : state) {
    benchmark::DoNotOptimize(grpc_core::ExternallyManagedSlice("abc"));
  }
  track_counters.Finish(state);
}
BENCHMARK(BM_SliceFromStatic);

static void BM_SliceFromCopied(benchmark::State& state) {
  TrackCounters track_counters;
  for (auto _ : state) {
    grpc_slice_unref(grpc_core::UnmanagedMemorySlice("abc"));
  }
  track_counters.Finish(state);
}
BENCHMARK(BM_SliceFromCopied);

static void BM_SliceIntern(benchmark::State& state) {
  TrackCounters track_counters;
  grpc_core::ExternallyManagedSlice slice("abc");
  for (auto _ : state) {
    grpc_slice_unref(grpc_core::ManagedMemorySlice(&slice));
  }
  track_counters.Finish(state);
}
BENCHMARK(BM_SliceIntern);

static void BM_SliceReIntern(benchmark::State& state) {
  TrackCounters track_counters;
  grpc_core::ExternallyManagedSlice static_slice("abc");
  grpc_core::ManagedMemorySlice slice(&static_slice);
  for (auto _ : state) {
    grpc_slice_unref(grpc_core::ManagedMemorySlice(&slice));
  }
  track_counters.Finish(state);
}
BENCHMARK(BM_SliceReIntern);

static void BM_SliceInternStaticMetadata(benchmark::State& state) {
  TrackCounters track_counters;
  for (auto _ : state) {
    benchmark::DoNotOptimize(grpc_core::ManagedMemorySlice(&GRPC_MDSTR_GZIP));
  }
  track_counters.Finish(state);
}
BENCHMARK(BM_SliceInternStaticMetadata);

static void BM_SliceInternEqualToStaticMetadata(benchmark::State& state) {
  TrackCounters track_counters;
  grpc_core::ExternallyManagedSlice slice("gzip");
  for (auto _ : state) {
    benchmark::DoNotOptimize(grpc_core::ManagedMemorySlice(&slice));
  }
  track_counters.Finish(state);
}
BENCHMARK(BM_SliceInternEqualToStaticMetadata);

static void BM_MetadataFromNonInternedSlices(benchmark::State& state) {
  TrackCounters track_counters;
  grpc_core::ExternallyManagedSlice k("key");
  grpc_core::ExternallyManagedSlice v("value");
  grpc_core::ExecCtx exec_ctx;
  for (auto _ : state) {
    GRPC_MDELEM_UNREF(grpc_mdelem_create(k, v, nullptr));
  }

  track_counters.Finish(state);
}
BENCHMARK(BM_MetadataFromNonInternedSlices);

static void BM_MetadataFromInternedSlices(benchmark::State& state) {
  TrackCounters track_counters;
  grpc_core::ManagedMemorySlice k("key");
  grpc_core::ManagedMemorySlice v("value");
  grpc_core::ExecCtx exec_ctx;
  for (auto _ : state) {
    GRPC_MDELEM_UNREF(grpc_mdelem_create(k, v, nullptr));
  }

  grpc_slice_unref(k);
  grpc_slice_unref(v);
  track_counters.Finish(state);
}
BENCHMARK(BM_MetadataFromInternedSlices);

static void BM_MetadataFromInternedSlicesAlreadyInIndex(
    benchmark::State& state) {
  TrackCounters track_counters;
  grpc_core::ManagedMemorySlice k("key");
  grpc_core::ManagedMemorySlice v("value");
  grpc_core::ExecCtx exec_ctx;
  grpc_mdelem seed = grpc_mdelem_create(k, v, nullptr);
  for (auto _ : state) {
    GRPC_MDELEM_UNREF(grpc_mdelem_create(k, v, nullptr));
  }
  GRPC_MDELEM_UNREF(seed);

  grpc_slice_unref(k);
  grpc_slice_unref(v);
  track_counters.Finish(state);
}
BENCHMARK(BM_MetadataFromInternedSlicesAlreadyInIndex);

static void BM_MetadataFromInternedKey(benchmark::State& state) {
  TrackCounters track_counters;
  grpc_core::ManagedMemorySlice k("key");
  grpc_core::ExternallyManagedSlice v("value");
  grpc_core::ExecCtx exec_ctx;
  for (auto _ : state) {
    GRPC_MDELEM_UNREF(grpc_mdelem_create(k, v, nullptr));
  }

  grpc_slice_unref(k);
  track_counters.Finish(state);
}
BENCHMARK(BM_MetadataFromInternedKey);

static void BM_MetadataFromNonInternedSlicesWithBackingStore(
    benchmark::State& state) {
  TrackCounters track_counters;
  grpc_core::ExternallyManagedSlice k("key");
  grpc_core::ExternallyManagedSlice v("value");
  char backing_store[sizeof(grpc_mdelem_data)];
  grpc_core::ExecCtx exec_ctx;
  for (auto _ : state) {
    GRPC_MDELEM_UNREF(grpc_mdelem_create(
        k, v, reinterpret_cast<grpc_mdelem_data*>(backing_store)));
  }

  track_counters.Finish(state);
}
BENCHMARK(BM_MetadataFromNonInternedSlicesWithBackingStore);

static void BM_MetadataFromInternedSlicesWithBackingStore(
    benchmark::State& state) {
  TrackCounters track_counters;
  grpc_core::ManagedMemorySlice k("key");
  grpc_core::ManagedMemorySlice v("value");
  char backing_store[sizeof(grpc_mdelem_data)];
  grpc_core::ExecCtx exec_ctx;
  for (auto _ : state) {
    GRPC_MDELEM_UNREF(grpc_mdelem_create(
        k, v, reinterpret_cast<grpc_mdelem_data*>(backing_store)));
  }

  grpc_slice_unref(k);
  grpc_slice_unref(v);
  track_counters.Finish(state);
}
BENCHMARK(BM_MetadataFromInternedSlicesWithBackingStore);

static void BM_MetadataFromInternedKeyWithBackingStore(
    benchmark::State& state) {
  TrackCounters track_counters;
  grpc_core::ManagedMemorySlice k("key");
  grpc_core::ExternallyManagedSlice v("value");
  char backing_store[sizeof(grpc_mdelem_data)];
  grpc_core::ExecCtx exec_ctx;
  for (auto _ : state) {
    GRPC_MDELEM_UNREF(grpc_mdelem_create(
        k, v, reinterpret_cast<grpc_mdelem_data*>(backing_store)));
  }

  grpc_slice_unref(k);
  track_counters.Finish(state);
}
BENCHMARK(BM_MetadataFromInternedKeyWithBackingStore);

static void BM_MetadataFromStaticMetadataStrings(benchmark::State& state) {
  TrackCounters track_counters;
  grpc_core::ExecCtx exec_ctx;
  for (auto _ : state) {
    GRPC_MDELEM_UNREF(
        grpc_mdelem_create(GRPC_MDSTR_STATUS, GRPC_MDSTR_200, nullptr));
  }

  track_counters.Finish(state);
}
BENCHMARK(BM_MetadataFromStaticMetadataStrings);

static void BM_MetadataFromStaticMetadataStringsNotIndexed(
    benchmark::State& state) {
  TrackCounters track_counters;
  grpc_core::ExecCtx exec_ctx;
  for (auto _ : state) {
    GRPC_MDELEM_UNREF(
        grpc_mdelem_create(GRPC_MDSTR_STATUS, GRPC_MDSTR_GZIP, nullptr));
  }

  track_counters.Finish(state);
}
BENCHMARK(BM_MetadataFromStaticMetadataStringsNotIndexed);

static void BM_MetadataRefUnrefExternal(benchmark::State& state) {
  TrackCounters track_counters;
  char backing_store[sizeof(grpc_mdelem_data)];
  grpc_core::ExecCtx exec_ctx;
  grpc_mdelem el =
      grpc_mdelem_create(grpc_core::ExternallyManagedSlice("a"),
                         grpc_core::ExternallyManagedSlice("b"),
                         reinterpret_cast<grpc_mdelem_data*>(backing_store));
  for (auto _ : state) {
    GRPC_MDELEM_UNREF(GRPC_MDELEM_REF(el));
  }
  GRPC_MDELEM_UNREF(el);

  track_counters.Finish(state);
}
BENCHMARK(BM_MetadataRefUnrefExternal);

static void BM_MetadataRefUnrefInterned(benchmark::State& state) {
  TrackCounters track_counters;
  char backing_store[sizeof(grpc_mdelem_data)];
  grpc_core::ExecCtx exec_ctx;
  grpc_core::ManagedMemorySlice k("key");
  grpc_core::ManagedMemorySlice v("value");
  grpc_mdelem el = grpc_mdelem_create(
      k, v, reinterpret_cast<grpc_mdelem_data*>(backing_store));
  grpc_slice_unref(k);
  grpc_slice_unref(v);
  for (auto _ : state) {
    GRPC_MDELEM_UNREF(GRPC_MDELEM_REF(el));
  }
  GRPC_MDELEM_UNREF(el);

  track_counters.Finish(state);
}
BENCHMARK(BM_MetadataRefUnrefInterned);

static void BM_MetadataRefUnrefAllocated(benchmark::State& state) {
  TrackCounters track_counters;
  grpc_core::ExecCtx exec_ctx;
  grpc_mdelem el =
      grpc_mdelem_create(grpc_core::ExternallyManagedSlice("a"),
                         grpc_core::ExternallyManagedSlice("b"), nullptr);
  for (auto _ : state) {
    GRPC_MDELEM_UNREF(GRPC_MDELEM_REF(el));
  }
  GRPC_MDELEM_UNREF(el);

  track_counters.Finish(state);
}
BENCHMARK(BM_MetadataRefUnrefAllocated);

static void BM_MetadataRefUnrefStatic(benchmark::State& state) {
  TrackCounters track_counters;
  grpc_core::ExecCtx exec_ctx;
  grpc_mdelem el =
      grpc_mdelem_create(GRPC_MDSTR_STATUS, GRPC_MDSTR_200, nullptr);
  for (auto _ : state) {
    GRPC_MDELEM_UNREF(GRPC_MDELEM_REF(el));
  }
  GRPC_MDELEM_UNREF(el);

  track_counters.Finish(state);
}
BENCHMARK(BM_MetadataRefUnrefStatic);

// Some distros have RunSpecifiedBenchmarks under the benchmark namespace,
// and others do not. This allows us to support both modes.
namespace benchmark {
void RunTheBenchmarksNamespaced() { RunSpecifiedBenchmarks(); }
}  // namespace benchmark

int main(int argc, char** argv) {
  LibraryInitializer libInit;
  ::benchmark::Initialize(&argc, argv);
  ::grpc::testing::InitTest(&argc, &argv, false);
  benchmark::RunTheBenchmarksNamespaced();
  return 0;
}
