VILLASnode/lib/nodes/loopback_internal.cpp

/** Node-type for internal loopback_internal connections.
 *
 * @author Steffen Vogel <post@steffenvogel.de>
 * @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
 * @license Apache 2.0
 *********************************************************************************/

#include <cstring>

#include <villas/node/config.hpp>
#include <villas/nodes/loopback_internal.hpp>
#include <villas/exceptions.hpp>
#include <villas/node/memory.hpp>
#include <villas/uuid.hpp>
#include <villas/colors.hpp>

using namespace villas;
using namespace villas::node;

static InternalLoopbackNodeFactory nf;

InternalLoopbackNode::InternalLoopbackNode(Node *src, unsigned id, unsigned ql) :
	queuelen(ql),
	source(src)
{
	auto name = fmt::format("{}.lo{}", src->getNameShort(), id);

	uuid_t uuid;
	int ret = uuid::generateFromString(uuid, fmt::format("lo{}", id), src->getUuid());
	if (ret)
		throw RuntimeError("Failed to initialize UUID");

	Node(uuid, name);

	factory = &nf;
	name_long = fmt::format(CLR_RED("{}") "(" CLR_YEL("{}") ")", name_short, nf.getName());

	auto logger_name = fmt::format("node:{}", getNameShort());

	logger = logging.get(logger_name);

	in.signals = source->getInputSignals(false);

	ret = queue_signalled_init(&queue, queuelen);
	if (ret)
		throw RuntimeError("Failed to initialize queue");

	state = State::PREPARED;
}

InternalLoopbackNode::~InternalLoopbackNode()
{
	int ret __attribute__((unused));

	ret = queue_signalled_destroy(&queue);
}

int InternalLoopbackNode::stop()
{
	int ret;

	ret = queue_signalled_close(&queue);
	if (ret)
		return ret;

	return 0;
}

int InternalLoopbackNode::_read(struct Sample * smps[], unsigned cnt)
{
	int avail;

	struct Sample *cpys[cnt];

	avail = queue_signalled_pull_many(&queue, (void **) cpys, cnt);

	sample_copy_many(smps, cpys, avail);
	sample_decref_many(cpys, avail);

	return avail;
}

int InternalLoopbackNode::_write(struct Sample * smps[], unsigned cnt)
{
	sample_incref_many(smps, cnt);

	int pushed = queue_signalled_push_many(&queue, (void **) smps, cnt);
	if (pushed < 0) {
		sample_decref_many(smps, cnt);
		return pushed;
	}

	/* Released unpushed samples */
	if ((unsigned) pushed < cnt) {
		sample_decref_many(smps + pushed, cnt - pushed);
		logger->warn("Queue overrun");
	}

	return pushed;
}

std::vector<int> InternalLoopbackNode::getPollFDs()
{
	return { queue_signalled_fd(&queue) };
}