/*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 * 
 *  Libmemcached Client and Server 
 *
 *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are
 *  met:
 *
 *      * Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 *
 *      * Redistributions in binary form must reproduce the above
 *  copyright notice, this list of conditions and the following disclaimer
 *  in the documentation and/or other materials provided with the
 *  distribution.
 *
 *      * The names of its contributors may not be used to endorse or
 *  promote products derived from this software without specific prior
 *  written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <mem_config.h>
#include <libtest/test.hpp>

using namespace libtest;

#include <vector>
#include <iostream>
#include <string>
#include <cerrno>

#include <semaphore.h>

#include <libmemcached-1.2/memcached.h>
#include <libmemcachedutil-1.2/util.h>
#include <libmemcached/is.h>
#include <tests/pool.h>

#include <pthread.h>
#include <poll.h>

#include "libmemcached/instance.hpp"

#ifndef __INTEL_COMPILER
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
#endif


test_return_t memcached_pool_test(memcached_st *)
{
  const char *config_string= "--SERVER=host10.example.com --SERVER=host11.example.com --SERVER=host10.example.com --POOL-MIN=10 --POOL-MAX=32";

  char buffer[2048];

  test_compare(libmemcached_check_configuration(config_string, sizeof(config_string) -1, buffer, sizeof(buffer)), MEMCACHED_PARSE_ERROR);

  memcached_pool_st* pool= memcached_pool(config_string, strlen(config_string));
  test_true(pool);

  memcached_return_t rc;
  memcached_st *memc= memcached_pool_pop(pool, false, &rc);

  test_compare(rc, MEMCACHED_SUCCESS);
  test_true(memc);

  /*
    Release the memc_ptr that was pulled from the pool
  */
  memcached_pool_push(pool, memc);

  /*
    Destroy the pool.
  */
  memcached_pool_destroy(pool);

  return TEST_SUCCESS;
}


#define POOL_SIZE 10
test_return_t connection_pool_test(memcached_st *memc)
{
  memcached_pool_st* pool= memcached_pool_create(memc, 5, POOL_SIZE);
  test_true(pool);
  memcached_st *mmc[POOL_SIZE];

  // Fill up our array that we will store the memc that are in the pool
  for (size_t x= 0; x < POOL_SIZE; ++x)
  {
    memcached_return_t rc;
    mmc[x]= memcached_pool_fetch(pool, NULL, &rc);
    test_compare(MEMCACHED_SUCCESS, rc);
    test_true(mmc[x]);
  }

  // All memc should be gone
  {
    memcached_return_t rc;
    test_null(memcached_pool_fetch(pool, NULL, &rc));
    test_compare(MEMCACHED_NOTFOUND, rc);
  }

  // Release them..
  for (size_t x= 0; x < POOL_SIZE; ++x)
  {
    if (mmc[x])
    {
      test_compare(MEMCACHED_SUCCESS, memcached_pool_release(pool, mmc[x]));
    }
  }
  test_true(memcached_pool_destroy(pool) == memc);

  return TEST_SUCCESS;
}

test_return_t connection_pool2_test(memcached_st *memc)
{
  memcached_pool_st* pool= memcached_pool_create(memc, 5, POOL_SIZE);
  test_true(pool);
  memcached_st *mmc[POOL_SIZE];

  // Fill up our array that we will store the memc that are in the pool
  for (size_t x= 0; x < POOL_SIZE; ++x)
  {
    memcached_return_t rc;
    mmc[x]= memcached_pool_fetch(pool, NULL, &rc);
    test_compare(MEMCACHED_SUCCESS, rc);
    test_true(mmc[x]);
  }

  // All memc should be gone
  {
    memcached_return_t rc;
    test_null(memcached_pool_fetch(pool, NULL, &rc));
    test_compare(MEMCACHED_NOTFOUND, rc);
  }

  // verify that I can do ops with all connections
  test_compare(MEMCACHED_SUCCESS,
               memcached_set(mmc[0],
                             test_literal_param("key"),
                             "0", 1, 0, 0));

  for (uint64_t x= 0; x < POOL_SIZE; ++x)
  {
    uint64_t number_value;
    test_compare(MEMCACHED_SUCCESS,
                 memcached_increment(mmc[x], 
                                     test_literal_param("key"),
                                     1, &number_value));
    test_compare(number_value, (x+1));
  }

  // Release them..
  for (size_t x= 0; x < POOL_SIZE; ++x)
  {
    test_compare(MEMCACHED_SUCCESS, memcached_pool_release(pool, mmc[x]));
  }


  /* verify that I can set behaviors on the pool when I don't have all
   * of the connections in the pool. It should however be enabled
   * when I push the item into the pool
 */
  mmc[0]= memcached_pool_fetch(pool, NULL, NULL);
  test_true(mmc[0]);

  test_compare(MEMCACHED_SUCCESS,
               memcached_pool_behavior_set(pool, MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK, 9999));

  {
    memcached_return_t rc;
    mmc[1]= memcached_pool_fetch(pool, NULL, &rc);
    test_true(mmc[1]);
    test_compare(MEMCACHED_SUCCESS, rc);
  }

  test_compare(UINT64_C(9999), memcached_behavior_get(mmc[1], MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK));
  test_compare(MEMCACHED_SUCCESS, memcached_pool_release(pool, mmc[1]));
  test_compare(MEMCACHED_SUCCESS, memcached_pool_release(pool, mmc[0]));

  {
    memcached_return_t rc;
    mmc[0]= memcached_pool_fetch(pool, NULL, &rc);
    test_true(mmc[0]);
    test_compare(MEMCACHED_SUCCESS, rc);
  }

  test_compare(UINT64_C(9999), memcached_behavior_get(mmc[0], MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK));
  test_compare(MEMCACHED_SUCCESS, memcached_pool_release(pool, mmc[0]));

  test_true(memcached_pool_destroy(pool) == memc);

  return TEST_SUCCESS;
}

struct test_pool_context_st {
  volatile memcached_return_t rc;
  memcached_pool_st* pool;
  memcached_st* mmc;
  sem_t _lock;

  test_pool_context_st(memcached_pool_st *pool_arg, memcached_st *memc_arg):
    rc(MEMCACHED_FAILURE),
    pool(pool_arg),
    mmc(memc_arg)
  {
    sem_init(&_lock, 0, 0);
  }

  void wait()
  {
    sem_wait(&_lock);
  }

  void release()
  {
    sem_post(&_lock);
  }

  ~test_pool_context_st()
  {
    sem_destroy(&_lock);
  }
};

static __attribute__((noreturn)) void* connection_release(void *arg)
{
  test_pool_context_st *resource= static_cast<test_pool_context_st *>(arg);
  FATAL_IF(resource == NULL);

  // Release all of the memc we are holding 
  resource->rc= memcached_pool_release(resource->pool, resource->mmc);
  resource->release();

  pthread_exit(arg);
}

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunreachable-code"
test_return_t connection_pool3_test(memcached_st *memc)
{
#ifdef __APPLE__
  SKIP_IF(__APPLE__);
#endif

  memcached_pool_st* pool= memcached_pool_create(memc, 1, 1);
  test_true(pool);

  memcached_st *pool_memc;
  {
    memcached_return_t rc;
    pool_memc= memcached_pool_fetch(pool, NULL, &rc);
    test_compare(MEMCACHED_SUCCESS, rc);
    test_true(pool_memc);
  }

  /*
    @note This comment was written to describe what was believed to be the original authors intent.

    This portion of the test creates a thread that will wait until told to free a memcached_st
    that will be grabbed by the main thread.

    It is believed that this tests whether or not we are handling ownership correctly.
  */
  pthread_t tid;
  test_pool_context_st item(pool, pool_memc);

  test_zero(pthread_create(&tid, NULL, connection_release, &item));
  item.wait();

  memcached_return_t rc;
  memcached_st *pop_memc;
  // We do a hard loop, and try N times
  int counter= 5;
  do
  {
    struct timespec relative_time= { 0, 0 };
    pop_memc= memcached_pool_fetch(pool, &relative_time, &rc);

    if (memcached_success(rc))
    {
      break;
    }

    if (memcached_failed(rc))
    {
      test_null(pop_memc);
      test_true(rc != MEMCACHED_TIMEOUT); // As long as relative_time is zero, MEMCACHED_TIMEOUT is invalid
    }
  } while (--counter);

  if (memcached_failed(rc)) // Cleanup thread since we will exit once we test.
  {
    pthread_join(tid, NULL);
    test_compare(MEMCACHED_SUCCESS, rc);
  }

  {
    int pthread_ret= pthread_join(tid, NULL);
    test_true(pthread_ret == 0 or pthread_ret == ESRCH);
  }
  test_compare(MEMCACHED_SUCCESS, rc);
  test_true(pool_memc == pop_memc);

  test_true(memcached_pool_destroy(pool) == memc);

  return TEST_SUCCESS;
}
#pragma GCC diagnostic pop

static memcached_st * create_single_instance_memcached(const memcached_st *original_memc, const char *options)
{
  /*
    If no options are given, copy over at least the binary flag.
  */
  char options_buffer[1024]= { 0 };
  if (options == NULL)
  {
    if (memcached_is_binary(original_memc))
    {
      snprintf(options_buffer, sizeof(options_buffer), "--BINARY");
    }
  }

  /*
   * I only want to hit _one_ server so I know the number of requests I'm
   * sending in the pipeline.
   */
  const memcached_instance_st * instance= memcached_server_instance_by_position(original_memc, 0);

  char server_string[1024];
  int server_string_length;
  if (instance->type == MEMCACHED_CONNECTION_UNIX_SOCKET)
  {
    if (options)
    {
      server_string_length= snprintf(server_string, sizeof(server_string), "--SOCKET=\"%s\" %s",
                                     memcached_server_name(instance), options);
    }
    else
    {
      server_string_length= snprintf(server_string, sizeof(server_string), "--SOCKET=\"%s\"",
                                     memcached_server_name(instance));
    }
  }
  else
  {
    if (options)
    {
      server_string_length= snprintf(server_string, sizeof(server_string), "--server=%s:%d %s",
                                     memcached_server_name(instance), int(memcached_server_port(instance)),
                                     options);
    }
    else
    {
      server_string_length= snprintf(server_string, sizeof(server_string), "--server=%s:%d",
                                     memcached_server_name(instance), int(memcached_server_port(instance)));
    }
  }

  if (server_string_length <= 0)
  {
    return NULL;
  }

  char errror_buffer[1024];
  if (memcached_failed(libmemcached_check_configuration(server_string, server_string_length, errror_buffer, sizeof(errror_buffer))))
  {
    Error << "Failed to parse (" << server_string << ") " << errror_buffer;
    return NULL;
  }

  return memcached(server_string, server_string_length);
}

pthread_mutex_t mutex= PTHREAD_MUTEX_INITIALIZER;
static bool _running= false;

static void set_running(const bool arg)
{
  int error;
  FATAL_IF_((error= pthread_mutex_lock(&mutex)) != 0, strerror(error));

  _running= arg;

  FATAL_IF_((error= pthread_mutex_unlock(&mutex)) != 0, strerror(error));
}

static bool running()
{
  int error;
  bool ret;
  
  FATAL_IF_((error= pthread_mutex_lock(&mutex)) != 0, strerror(error));

  ret= _running;

  FATAL_IF_((error= pthread_mutex_unlock(&mutex)) != 0, strerror(error));

  return ret;
}

static void *worker_thread(void *ctx)
{
  memcached_pool_st *pool= (memcached_pool_st *)ctx;

  while (running())
  {
    memcached_return_t rc;
    memcached_st *mc= memcached_pool_pop(pool, true, &rc);

    if (mc == NULL)
    {
      Error << "failed to fetch a connection from the pool" << memcached_strerror(NULL, rc);
      dream(1, 0);
      continue;
    }

    rc= memcached_set(mc, "test:kv", 7, "value", 5, 600, 0);
    if (memcached_failed(rc))
    {
      Out << "failed memcached_set()";
    }

    rc= memcached_pool_push(pool, mc);
    if (memcached_failed(rc))
    {
      Error << "failed to release a connection to the pool" << memcached_strerror(NULL, rc);
    }
  }

  return NULL;
}

#define NUM_THREADS 20
test_return_t regression_bug_962815(memcached_st *memc)
{
  pthread_t pid[NUM_THREADS];

  test_false(running());

  memcached_st *master = create_single_instance_memcached(memc, 0);
  test_true(master);

  memcached_pool_st *pool= memcached_pool_create(master, 5, 10);

  test_true(pool);

  set_running(true);

  for (size_t x=0; x < NUM_THREADS; x++)
  {
    test_compare(0, pthread_create(&pid[x], NULL, worker_thread, (void*)pool));
  }

  {
    pollfd fds[1];
    memset(fds, 0, sizeof(pollfd));
    fds[0].fd= -1; //STDIN_FILENO;
    fds[0].events= POLLIN;
    fds[0].revents= 0;

    int active_fd;
    if ((active_fd= poll(fds, 1, 5000)) == -1)
    {
      Error << "poll() failed with:" << strerror(errno);
    }
    test_zero(active_fd);

    set_running(false);
  }

  for (size_t x=0; x < NUM_THREADS; x++)
  {
    test_compare(0, pthread_join(pid[x], NULL));
  }

  memcached_pool_destroy(pool);

  memcached_free(master);

  return TEST_SUCCESS;
}
