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 *
 * Copyright 2015, Google Inc.
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 * 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.
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 * contributors may 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
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#include "src/core/lib/iomgr/port.h"
#include "test/core/util/test_config.h"
#if defined(GRPC_UV) && defined(GRPC_TEST_PICK_PORT)

#include <grpc/support/alloc.h>
#include <grpc/support/log.h>

#include "src/core/lib/support/env.h"
#include "test/core/util/port.h"
#include "test/core/util/port_server_client.h"

// Almost everything in this file has been copied from port_posix.c

static int *chosen_ports = NULL;
static size_t num_chosen_ports = 0;

static int free_chosen_port(int port) {
  size_t i;
  int found = 0;
  size_t found_at = 0;
  char *env = gpr_getenv("GRPC_TEST_PORT_SERVER");
  /* Find the port and erase it from the list, then tell the server it can be
     freed. */
  for (i = 0; i < num_chosen_ports; i++) {
    if (chosen_ports[i] == port) {
      GPR_ASSERT(found == 0);
      found = 1;
      found_at = i;
    }
  }
  if (found) {
    chosen_ports[found_at] = chosen_ports[num_chosen_ports - 1];
    num_chosen_ports--;
    if (env) {
      grpc_free_port_using_server(env, port);
    }
  }
  gpr_free(env);
  return found;
}

static void free_chosen_ports(void) {
  char *env = gpr_getenv("GRPC_TEST_PORT_SERVER");
  if (env != NULL) {
    size_t i;
    for (i = 0; i < num_chosen_ports; i++) {
      grpc_free_port_using_server(env, chosen_ports[i]);
    }
    gpr_free(env);
  }

  gpr_free(chosen_ports);
}

static void chose_port(int port) {
  if (chosen_ports == NULL) {
    atexit(free_chosen_ports);
  }
  num_chosen_ports++;
  chosen_ports = gpr_realloc(chosen_ports, sizeof(int) * num_chosen_ports);
  chosen_ports[num_chosen_ports - 1] = port;
}

int grpc_pick_unused_port(void) {
  // Currently only works with the port server
  char *env = gpr_getenv("GRPC_TEST_PORT_SERVER");
  GPR_ASSERT(env);
  int port = grpc_pick_port_using_server(env);
  gpr_free(env);
  if (port != 0) {
    chose_port(port);
  }
  return port;
}

int grpc_pick_unused_port_or_die(void) {
  int port = grpc_pick_unused_port();
  GPR_ASSERT(port > 0);
  return port;
}

void grpc_recycle_unused_port(int port) { GPR_ASSERT(free_chosen_port(port)); }

#endif /* GRPC_UV && GRPC_TEST_PICK_PORT */