VILLASnode/lib/formats/msg.cpp

/* Message related functions.
 *
 * Author: Steffen Vogel <post@steffenvogel.de>
 * SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
 * SPDX-License-Identifier: Apache-2.0
 */

#include <arpa/inet.h>

#include <villas/formats/msg.hpp>
#include <villas/formats/msg_format.hpp>
#include <villas/list.hpp>
#include <villas/sample.hpp>
#include <villas/signal.hpp>
#include <villas/utils.hpp>

using namespace villas;
using namespace villas::node;

void villas::node::msg_ntoh(struct Message *m) {
  msg_hdr_ntoh(m);

  for (int i = 0; i < m->length; i++)
    m->data[i].i = ntohl(m->data[i].i);
}

void villas::node::msg_hton(struct Message *m) {
  for (int i = 0; i < m->length; i++)
    m->data[i].i = htonl(m->data[i].i);

  msg_hdr_hton(m);
}

void villas::node::msg_hdr_hton(struct Message *m) {
  m->length = htons(m->length);
  m->sequence = htonl(m->sequence);
  m->ts.sec = htonl(m->ts.sec);
  m->ts.nsec = htonl(m->ts.nsec);
}

void villas::node::msg_hdr_ntoh(struct Message *m) {
  m->length = ntohs(m->length);
  m->sequence = ntohl(m->sequence);
  m->ts.sec = ntohl(m->ts.sec);
  m->ts.nsec = ntohl(m->ts.nsec);
}

int villas::node::msg_verify(const struct Message *m) {
  if (m->version != MSG_VERSION)
    return -1;
  else if (m->type != MSG_TYPE_DATA)
    return -2;
  else if (m->reserved1 != 0)
    return -3;
  else
    return 0;
}

int villas::node::msg_to_sample(const struct Message *msg, struct Sample *smp,
                                const SignalList::Ptr sigs,
                                uint8_t *source_index) {
  int ret;
  unsigned i;

  ret = msg_verify(msg);
  if (ret)
    return ret;

  unsigned len = MIN(msg->length, smp->capacity);
  for (i = 0; i < MIN(len, sigs->size()); i++) {
    auto sig = sigs->getByIndex(i);
    if (!sig)
      return -1;

    switch (sig->type) {
    case SignalType::FLOAT:
      smp->data[i].f = msg->data[i].f;
      break;

    case SignalType::INTEGER:
      smp->data[i].i = msg->data[i].i;
      break;

    default:
      return -1;
    }
  }

  smp->flags = (int)SampleFlags::HAS_TS_ORIGIN |
               (int)SampleFlags::HAS_SEQUENCE | (int)SampleFlags::HAS_DATA;
  smp->length = i;
  smp->sequence = msg->sequence;
  MSG_TS(msg, smp->ts.origin);

  if (source_index)
    *source_index = msg->source_index;

  return 0;
}

int villas::node::msg_from_sample(struct Message *msg_in,
                                  const struct Sample *smp,
                                  const SignalList::Ptr sigs,
                                  uint8_t source_index) {
  msg_in->type = MSG_TYPE_DATA;
  msg_in->version = MSG_VERSION;
  msg_in->reserved1 = 0;
  msg_in->source_index = source_index;
  msg_in->length = (uint16_t)smp->length;
  msg_in->sequence = (uint32_t)smp->sequence;
  msg_in->ts.sec = smp->ts.origin.tv_sec;
  msg_in->ts.nsec = smp->ts.origin.tv_nsec;

  for (unsigned i = 0; i < smp->length; i++) {
    auto sig = sigs->getByIndex(i);
    if (!sig)
      return -1;

    switch (sig->type) {
    case SignalType::FLOAT:
      msg_in->data[i].f = smp->data[i].f;
      break;

    case SignalType::INTEGER:
      msg_in->data[i].i = smp->data[i].i;
      break;

    default:
      return -1;
    }
  }

  return 0;
}