// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
 * Ceph distributed storage system
 *
 * Copyright (C) 2015 Mirantis, Inc.
 *
 * Author: Alyona Kiseleva <akiselyova@mirantis.com>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 */

#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include "gtest/gtest.h"
#include "common/config.h"
#include "compressor/Compressor.h"
#include "compressor/CompressionPlugin.h"
#include "global/global_context.h"

class CompressorTest : public ::testing::Test,
			public ::testing::WithParamInterface<const char*> {
public:
  std::string plugin;
  CompressorRef compressor;
  bool old_zlib_isal;

  CompressorTest() {
    // note for later
    old_zlib_isal = g_conf->compressor_zlib_isal;

    plugin = GetParam();
    size_t pos = plugin.find('/');
    if (pos != std::string::npos) {
      string isal = plugin.substr(pos + 1);
      plugin = plugin.substr(0, pos);
      if (isal == "isal") {
	g_conf->set_val("compressor_zlib_isal", "true");
	g_ceph_context->_conf->apply_changes(NULL);
      } else if (isal == "noisal") {
	g_conf->set_val("compressor_zlib_isal", "false");
	g_ceph_context->_conf->apply_changes(NULL);
      } else {
	assert(0 == "bad option");
      }
    }
    cout << "[plugin " << plugin << " (" << GetParam() << ")]" << std::endl;
  }
  ~CompressorTest() override {
    g_conf->set_val("compressor_zlib_isal", old_zlib_isal ? "true" : "false");
    g_ceph_context->_conf->apply_changes(NULL);
  }

  void SetUp() override {
    compressor = Compressor::create(g_ceph_context, plugin);
    ASSERT_TRUE(compressor);
  }
  void TearDown() override {
    compressor.reset();
  }
};

TEST_P(CompressorTest, load_plugin)
{
}

TEST_P(CompressorTest, small_round_trip)
{
  bufferlist orig;
  orig.append("This is a short string.  There are many strings like it but this one is mine.");
  bufferlist compressed;
  int r = compressor->compress(orig, compressed);
  ASSERT_EQ(0, r);
  bufferlist decompressed;
  r = compressor->decompress(compressed, decompressed);
  ASSERT_EQ(0, r);
  ASSERT_EQ(decompressed.length(), orig.length());
  ASSERT_TRUE(decompressed.contents_equal(orig));
  cout << "orig " << orig.length() << " compressed " << compressed.length()
       << " with " << GetParam() << std::endl;
}

TEST_P(CompressorTest, big_round_trip_repeated)
{
  unsigned len = 1048576 * 4;
  bufferlist orig;
  while (orig.length() < len) {
    orig.append("This is a short string.  There are many strings like it but this one is mine.");
  }
  bufferlist compressed;
  int r = compressor->compress(orig, compressed);
  ASSERT_EQ(0, r);
  bufferlist decompressed;
  r = compressor->decompress(compressed, decompressed);
  ASSERT_EQ(0, r);
  ASSERT_EQ(decompressed.length(), orig.length());
  ASSERT_TRUE(decompressed.contents_equal(orig));
  cout << "orig " << orig.length() << " compressed " << compressed.length()
       << " with " << GetParam() << std::endl;
}

TEST_P(CompressorTest, big_round_trip_randomish)
{
  unsigned len = 1048576 * 10;//269;
  bufferlist orig;
  const char *alphabet = "abcdefghijklmnopqrstuvwxyz";
  if (false) {
    while (orig.length() < len) {
      orig.append(alphabet[rand() % 10]);
    }
  } else {
    bufferptr bp(len);
    char *p = bp.c_str();
    for (unsigned i=0; i<len; ++i) {
      p[i] = alphabet[rand() % 10];
    }
    orig.append(bp);
  }
  bufferlist compressed;
  int r = compressor->compress(orig, compressed);
  ASSERT_EQ(0, r);
  bufferlist decompressed;
  r = compressor->decompress(compressed, decompressed);
  ASSERT_EQ(0, r);
  ASSERT_EQ(decompressed.length(), orig.length());
  ASSERT_TRUE(decompressed.contents_equal(orig));
  cout << "orig " << orig.length() << " compressed " << compressed.length()
       << " with " << GetParam() << std::endl;
}

#if 0
TEST_P(CompressorTest, big_round_trip_file)
{
  bufferlist orig;
  int fd = ::open("bin/ceph-osd", O_RDONLY);
  struct stat st;
  ::fstat(fd, &st);
  orig.read_fd(fd, st.st_size);

  bufferlist compressed;
  int r = compressor->compress(orig, compressed);
  ASSERT_EQ(0, r);
  bufferlist decompressed;
  r = compressor->decompress(compressed, decompressed);
  ASSERT_EQ(0, r);
  ASSERT_EQ(decompressed.length(), orig.length());
  ASSERT_TRUE(decompressed.contents_equal(orig));
  cout << "orig " << orig.length() << " compressed " << compressed.length()
       << " with " << GetParam() << std::endl;
}
#endif


TEST_P(CompressorTest, compress_decompress)
{
  const char* test = "This is test text";
  int res;
  int len = strlen(test);
  bufferlist in, out;
  bufferlist after;
  bufferlist exp;
  in.append(test, len);
  res = compressor->compress(in, out);
  EXPECT_EQ(res, 0);
  res = compressor->decompress(out, after);
  EXPECT_EQ(res, 0);
  exp.append(test);
  EXPECT_TRUE(exp.contents_equal(after));
  after.clear();
  size_t compressed_len = out.length();
  out.append_zero(12);
  auto it = out.begin();
  res = compressor->decompress(it, compressed_len, after);
  EXPECT_EQ(res, 0);
  EXPECT_TRUE(exp.contents_equal(after));

  //large block and non-begin iterator for continuous block
  std::string data;
  data.resize(0x10000 * 1);
  for(size_t i = 0; i < data.size(); i++)
    data[i] = i / 256;
  in.clear();
  out.clear();
  in.append(data);
  exp = in;
  res = compressor->compress(in, out);
  EXPECT_EQ(res, 0);
  compressed_len = out.length();
  out.append_zero(0x10000 - out.length());
  after.clear();
  out.c_str();
  bufferlist prefix;
  prefix.append(string("some prefix"));
  size_t prefix_len = prefix.length();
  out.claim_prepend(prefix);
  it = out.begin();
  it.advance(prefix_len);
  res = compressor->decompress(it, compressed_len, after);
  EXPECT_EQ(res, 0);
  EXPECT_TRUE(exp.contents_equal(after));
}

TEST_P(CompressorTest, sharded_input_decompress)
{
  const size_t small_prefix_size=3;

  string test(128*1024,0);
  int len = test.size();
  bufferlist in, out;
  in.append(test.c_str(), len);
  int res = compressor->compress(in, out);
  EXPECT_EQ(res, 0);
  EXPECT_GT(out.length(), small_prefix_size);

  bufferlist out2, tmp;
  tmp.substr_of(out, 0, small_prefix_size );
  out2.append( tmp );
  size_t left = out.length()-small_prefix_size;
  size_t offs = small_prefix_size;
  while( left > 0 ){
    size_t shard_size = MIN( 2048, left );
    tmp.substr_of(out, offs, shard_size );
    out2.append( tmp );
    left -= shard_size;
    offs += shard_size;
  }

  bufferlist after;
  res = compressor->decompress(out2, after);
  EXPECT_EQ(res, 0);
}

void test_compress(CompressorRef compressor, size_t size)
{
  char* data = (char*) malloc(size);
  for (size_t t = 0; t < size; t++) {
    data[t] = (t & 0xff) | (t >> 8);
  }
  bufferlist in;
  in.append(data, size);
  for (size_t t = 0; t < 10000; t++) {
    bufferlist out;
    int res = compressor->compress(in, out);
    EXPECT_EQ(res, 0);
  }
}

void test_decompress(CompressorRef compressor, size_t size)
{
  char* data = (char*) malloc(size);
  for (size_t t = 0; t < size; t++) {
    data[t] = (t & 0xff) | (t >> 8);
  }
  bufferlist in, out;
  in.append(data, size);
  int res = compressor->compress(in, out);
  EXPECT_EQ(res, 0);
  for (size_t t = 0; t < 10000; t++) {
    bufferlist out_dec;
    int res = compressor->decompress(out, out_dec);
    EXPECT_EQ(res, 0);
  }
}

TEST_P(CompressorTest, compress_1024)
{
  test_compress(compressor, 1024);
}

TEST_P(CompressorTest, compress_2048)
{
  test_compress(compressor, 2048);
}

TEST_P(CompressorTest, compress_4096)
{
  test_compress(compressor, 4096);
}

TEST_P(CompressorTest, compress_8192)
{
  test_compress(compressor, 8192);
}

TEST_P(CompressorTest, compress_16384)
{
  test_compress(compressor, 16384);
}

TEST_P(CompressorTest, decompress_1024)
{
  test_decompress(compressor, 1024);
}

TEST_P(CompressorTest, decompress_2048)
{
  test_decompress(compressor, 2048);
}

TEST_P(CompressorTest, decompress_4096)
{
  test_decompress(compressor, 4096);
}

TEST_P(CompressorTest, decompress_8192)
{
  test_decompress(compressor, 8192);
}

TEST_P(CompressorTest, decompress_16384)
{
  test_decompress(compressor, 16384);
}


INSTANTIATE_TEST_CASE_P(
  Compressor,
  CompressorTest,
  ::testing::Values(
#ifdef HAVE_LZ4
    "lz4",
#endif
#ifdef __x86_64__
    "zlib/isal",
#endif
    "zlib/noisal",
    "snappy",
    "zstd"));

#ifdef __x86_64__

TEST(ZlibCompressor, zlib_isal_compatibility)
{
  g_conf->set_val("compressor_zlib_isal", "true");
  g_ceph_context->_conf->apply_changes(NULL);
  CompressorRef isal = Compressor::create(g_ceph_context, "zlib");
  if (!isal) {
    // skip the test if the plugin is not ready
    return;
  }
  g_conf->set_val("compressor_zlib_isal", "false");
  g_ceph_context->_conf->apply_changes(NULL);
  CompressorRef zlib = Compressor::create(g_ceph_context, "zlib");
  char test[101];
  srand(time(0));
  for (int i=0; i<100; ++i)
    test[i] = 'a' + rand()%26;
  test[100] = '\0';
  int len = strlen(test);
  bufferlist in, out;
  in.append(test, len);
  // isal -> zlib
  int res = isal->compress(in, out);
  EXPECT_EQ(res, 0);
  bufferlist after;
  res = zlib->decompress(out, after);
  EXPECT_EQ(res, 0);
  bufferlist exp;
  exp.append(test);
  EXPECT_TRUE(exp.contents_equal(after));
  after.clear();
  out.clear();
  exp.clear();
  // zlib -> isal
  res = zlib->compress(in, out);
  EXPECT_EQ(res, 0);
  res = isal->decompress(out, after);
  EXPECT_EQ(res, 0);
  exp.append(test);
  EXPECT_TRUE(exp.contents_equal(after));
}
#endif

TEST(CompressionPlugin, all)
{
  const char* env = getenv("CEPH_LIB");
  std::string directory(env ? env : ".libs");
  CompressorRef compressor;
  PluginRegistry *reg = g_ceph_context->get_plugin_registry();
  EXPECT_TRUE(reg);
  CompressionPlugin *factory = dynamic_cast<CompressionPlugin*>(reg->get_with_load("compressor", "invalid"));
  EXPECT_FALSE(factory);
  factory = dynamic_cast<CompressionPlugin*>(reg->get_with_load("compressor", "example"));
  EXPECT_TRUE(factory);
  stringstream ss;
  EXPECT_EQ(0, factory->factory(&compressor, &ss));
  EXPECT_TRUE(compressor.get());
  {
    Mutex::Locker l(reg->lock);
    EXPECT_EQ(-ENOENT, reg->remove("compressor", "does not exist"));
    EXPECT_EQ(0, reg->remove("compressor", "example"));
    EXPECT_EQ(0, reg->load("compressor", "example"));
  }
}

#ifdef __x86_64__

TEST(ZlibCompressor, isal_compress_zlib_decompress_random)
{
  g_conf->set_val("compressor_zlib_isal", "true");
  g_ceph_context->_conf->apply_changes(NULL);
  CompressorRef isal = Compressor::create(g_ceph_context, "zlib");
  if (!isal) {
    // skip the test if the plugin is not ready
    return;
  }
  g_conf->set_val("compressor_zlib_isal", "false");
  g_ceph_context->_conf->apply_changes(NULL);
  CompressorRef zlib = Compressor::create(g_ceph_context, "zlib");

  for (int cnt=0; cnt<100; cnt++)
  {
    srand(cnt + 1000);
    int log2 = (rand()%18) + 1;
    int size = (rand() % (1 << log2)) + 1;

    char test[size];
    for (int i=0; i<size; ++i)
      test[i] = rand()%256;
    bufferlist in, out;
    in.append(test, size);

    int res = isal->compress(in, out);
    EXPECT_EQ(res, 0);
    bufferlist after;
    res = zlib->decompress(out, after);
    EXPECT_EQ(res, 0);
    bufferlist exp;
    exp.append(test, size);
    EXPECT_TRUE(exp.contents_equal(after));
  }
}

TEST(ZlibCompressor, isal_compress_zlib_decompress_walk)
{
  g_conf->set_val("compressor_zlib_isal", "true");
  g_ceph_context->_conf->apply_changes(NULL);
  CompressorRef isal = Compressor::create(g_ceph_context, "zlib");
  if (!isal) {
    // skip the test if the plugin is not ready
    return;
  }
  g_conf->set_val("compressor_zlib_isal", "false");
  g_ceph_context->_conf->apply_changes(NULL);
  CompressorRef zlib = Compressor::create(g_ceph_context, "zlib");

  for (int cnt=0; cnt<100; cnt++)
  {
    srand(cnt + 1000);
    int log2 = (rand()%18) + 1;
    int size = (rand() % (1 << log2)) + 1;

    int range = 1;

    char test[size];
    test[0] = rand()%256;
    for (int i=1; i<size; ++i)
      test[i] = test[i-1] + rand()%(range*2+1) - range;
    bufferlist in, out;
    in.append(test, size);

    int res = isal->compress(in, out);
    EXPECT_EQ(res, 0);
    bufferlist after;
    res = zlib->decompress(out, after);
    EXPECT_EQ(res, 0);
    bufferlist exp;
    exp.append(test, size);
    EXPECT_TRUE(exp.contents_equal(after));
  }
}

#endif	// __x86_64__