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from mininet.topo import Topo
from mininet.link import TCLink
from mininet.net import Mininet
from mininet.node import CPULimitedHost
from mininet.link import TCLink
from mininet.util import dumpNodeConnections
from mininet.log import setLogLevel

class MyTopo( Topo ):
    "Simple topology example."

    def __init__( self ):
        "Create custom topo."

        # Initialize topology
        Topo.__init__( self )

        # Add hosts and switches
        leftHost = self.addHost( 'h1' )
        rightHost = self.addHost( 'h2' )
        Switch = self.addSwitch( 's1' )

        # Add links
        self.addLink( leftHost, Switch ,bw=10, delay='5ms')
        self.addLink( Switch, rightHost  )


topos = { 'mytopo': ( lambda: MyTopo() ) }

# 1. http server example
# 
#mininet> h1 python -m SimpleHTTPServer 80 &
#mininet> h2 wget -O - h1
# 2. limit mss example 
#decrease the MTU ifconfig eth0 mtu 488
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/*
 * Copyright (c) 2021 EMnify.
 *
 * 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 <vlib/vlib.h>
#include <vppinfra/time.h>
#include <vppinfra/cache.h>
#include <vppinfra/error.h>

#include <vlib/counter.h>
#include <vlib/stats/stats.h>

enum
{
  type_simple = 0,
  type_combined,
};

enum
{
  test_expand = 0,
};

/*
 * Return the stats segment epoch value.
 */
static uint64_t
get_stats_epoch ()
{
  vlib_stats_segment_t *sm = vlib_stats_get_segment ();
  return sm->shared_header->epoch;
}

/* number of times to repeat the counter expand tests */
#define EXPAND_TEST_ROUNDS 3

/*
 * Let a simple counter vector grow and verify that
 * the stats epoch is increased only when the vector
 * is expanded.
 */
static clib_error_t *
test_simple_counter_expand (vlib_main_t *vm)
{
  vlib_simple_counter_main_t counter = {
    .name = "test-simple-counter-expand",
    .stat_segment_name = "/vlib/test-simple-counter-expand",
  };
  int i, index;
  uint64_t epoch, new_epoch;

  // Create one counter to allocate the vector.
  vlib_validate_simple_counter (&counter, 0);
  epoch = get_stats_epoch ();

  for (i = 0; i < EXPAND_TEST_ROUNDS; i++)
    {
      // Check how many elements fit into the counter vector without expanding
      // that. The next validate calls should not increase the stats segment
      // epoch.
      int mem_size = vec_max_len (counter.counters[0]);
      for (index = 1; index <= mem_size - 1; index++)
	{
	  vlib_validate_simple_counter (&counter, index);
	  new_epoch = get_stats_epoch ();
	  if (new_epoch != epoch)
	    return clib_error_return (
	      0, "Stats segment epoch should not increase");
	}

      // The next counter index does not fit and it will extend the vector.
      // The stats segment epoch should increase.
      vlib_validate_simple_counter (&counter, index + 1);
      new_epoch = get_stats_epoch ();
      if (new_epoch == epoch)
	return clib_error_return (0,
				  "Stats segment epoch should have increased");
      epoch = new_epoch;
    }

  vlib_free_simple_counter (&counter);
  vlib_validate_simple_counter (&counter, 0);

  return 0;
}

/*
 * Let a combined counter vector grow and verify that
 * the stats epoch is increased only when the vector
 * is expanded.
 */
static clib_error_t *
test_combined_counter_expand (vlib_main_t *vm)
{
  vlib_combined_counter_main_t counter = {
    .name = "test-combined-counter-expand",
    .stat_segment_name = "/vlib/test-combined-counter-expand",
  };
  int i, index;
  uint64_t epoch, new_epoch;

  // Create one counter to allocate the vector.
  vlib_validate_combined_counter (&counter, 0);
  epoch = get_stats_epoch ();

  for (i = 0; i < EXPAND_TEST_ROUNDS; i++)
    {
      // Check how many elements fit into the counter vector without expanding
      // that. The next validate calls should not increase the stats segment
      // epoch.
      int mem_size = vec_max_len (counter.counters[0]);
      for (index = 1; index <= mem_size - 1; index++)
	{
	  vlib_validate_combined_counter (&counter, index);
	  new_epoch = get_stats_epoch ();
	  if (new_epoch != epoch)
	    return clib_error_return (
	      0, "Stats segment epoch should not increase");
	}

      // The next counter index does not fit and it will extend the vector.
      // The stats segment epoch should increase.
      vlib_validate_combined_counter (&counter, index + 1);
      new_epoch = get_stats_epoch ();
      if (new_epoch == epoch)
	return clib_error_return (0,
				  "Stats segment epoch should have increased");
      epoch = new_epoch;
    }

  vlib_free_combined_counter (&counter);
  vlib_validate_combined_counter (&counter, 0);

  return 0;
}

static clib_error_t *
test_simple_counter (vlib_main_t *vm, int test_case)
{
  clib_error_t *error;

  switch (test_case)
    {
    case test_expand:
      error = test_simple_counter_expand (vm);
      break;

    default:
      return clib_error_return (0, "no such test");
    }

  return error;
}

static clib_error_t *
test_combined_counter (vlib_main_t *vm, int test_case)
{
  clib_error_t *error;

  switch (test_case)
    {
    case test_expand:
      error = test_combined_counter_expand (vm);
      break;

    default:
      return clib_error_return (0, "no such test");
    }

  return error;
}

static clib_error_t *
test_counter_command_fn (vlib_main_t *vm, unformat_input_t *input,
			 vlib_cli_command_t *cmd)
{
  clib_error_t *error;
  int counter_type = -1;
  int test_case = -1;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "simple"))
	counter_type = type_simple;
      else if (unformat (input, "combined"))
	counter_type = type_combined;
      else if (unformat (input, "expand"))
	test_case = test_expand;
      else
	return clib_error_return (0, "unknown input '%U'",
				  format_unformat_error, input);
    }

  if (test_case == -1)
    return clib_error_return (0, "no such test");

  switch (counter_type)
    {
    case type_simple:
      error = test_simple_counter (vm, test_case);
      break;

    case type_combined:
      error = test_combined_counter (vm, test_case);
      break;

    default:
      return clib_error_return (0, "no such test");
    }

  return error;
}

VLIB_CLI_COMMAND (test_counter_command, static) = {
  .path = "test counter",
  .short_help = "test counter [simple | combined] expand",
  .function = test_counter_command_fn,
};

static clib_error_t *
test_counter_init (vlib_main_t *vm)
{
  return (0);
}

VLIB_INIT_FUNCTION (test_counter_init);

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */