quicer

/*--------------------------------------------------------------------
Copyright (c) 2021 EMQ Technologies Co., Ltd. All Rights Reserved.

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 "quicer_dgram.h"

ERL_NIF_TERM
send_dgram(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
{
  QuicerConnCTX *c_ctx;
  ERL_NIF_TERM econn = argv[0];
  ERL_NIF_TERM ebin = argv[1];
  ERL_NIF_TERM eFlags = argv[2];
  uint32_t sendflags;

  if (3 != argc)
    {
      return ERROR_TUPLE_2(ATOM_BADARG);
    }

  if (!enif_get_resource(env, econn, ctx_connection_t, (void **)&c_ctx))
    {
      return ERROR_TUPLE_2(ATOM_BADARG);
    }

  QuicerDgramSendCTX *dgram_send_ctx = init_dgram_send_ctx();
  if (!dgram_send_ctx)
    {
      return ERROR_TUPLE_2(ATOM_ERROR_NOT_ENOUGH_MEMORY);
    }

  ErlNifBinary *bin = &dgram_send_ctx->bin;

  if (enif_get_uint(env, eFlags, &sendflags))
    {
      enif_self(env, &dgram_send_ctx->caller);

      if ((sendflags & 1UL) > 0)
        {
          dgram_send_ctx->is_sync = TRUE;
        }
      else
        {
          dgram_send_ctx->is_sync = FALSE;
        }
    }
  else
    {
      destroy_dgram_send_ctx(dgram_send_ctx);
      return ERROR_TUPLE_2(ATOM_BADARG);
    }

  ebin = enif_make_copy(dgram_send_ctx->env, ebin);
  if (!(enif_inspect_iolist_as_binary(dgram_send_ctx->env, ebin, bin)
        || enif_inspect_binary(dgram_send_ctx->env, ebin, bin))
      || bin->size > UINT32_MAX)
    {
      destroy_dgram_send_ctx(dgram_send_ctx);
      return ERROR_TUPLE_2(ATOM_BADARG);
    }

  enif_mutex_lock(c_ctx->lock);

  HQUIC Connection = c_ctx->Connection;

  //
  // Allocates and builds the buffer to send in the datagram.
  //

  assert(bin->data != NULL);
  dgram_send_ctx->Buffer.Buffer = (uint8_t *)bin->data;
  dgram_send_ctx->Buffer.Length = (uint32_t)bin->size;

  QUIC_STATUS Status;
  if (QUIC_FAILED(Status = MsQuic->DatagramSend(Connection,
                                                &dgram_send_ctx->Buffer,
                                                1,
                                                QUIC_SEND_FLAG_NONE,
                                                dgram_send_ctx)))
    {
      destroy_dgram_send_ctx(dgram_send_ctx);
      enif_mutex_unlock(c_ctx->lock);
      return ERROR_TUPLE_3(ATOM_DGRAM_SEND_ERROR, ATOM_STATUS(Status));
    }
  else
    {
      enif_mutex_unlock(c_ctx->lock);
      return SUCCESS(ETERM_UINT_64(bin->size));
    }
}