mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-09 00:00:00 +01:00
121 lines
2.8 KiB
C++
121 lines
2.8 KiB
C++
/* Node type: Universal Data-exchange API (v2).
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*
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* @see https://github.com/ERIGrid2/JRA-3.1-api
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* Author: Steffen Vogel <post@steffenvogel.de>
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* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <vector>
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#include <villas/api/universal.hpp>
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#include <villas/exceptions.hpp>
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#include <villas/nodes/api.hpp>
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using namespace villas;
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using namespace villas::node;
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using namespace villas::node::api::universal;
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APINode::APINode(const uuid_t &id, const std::string &name)
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: Node(id, name), read(), write() {
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int ret;
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auto dirs = std::vector{&read, &write};
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for (auto dir : dirs) {
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ret = pthread_mutex_init(&dir->mutex, nullptr);
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if (ret)
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throw RuntimeError("failed to initialize mutex");
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ret = pthread_cond_init(&dir->cv, nullptr);
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if (ret)
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throw RuntimeError("failed to initialize mutex");
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}
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}
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int APINode::prepare() {
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auto signals_in = getInputSignals(false);
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read.sample = sample_alloc_mem(signals_in->size());
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if (!read.sample)
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throw MemoryAllocationError();
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write.sample = sample_alloc_mem(64);
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if (!write.sample)
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throw MemoryAllocationError();
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unsigned j = 0;
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for (auto sig : *signals_in)
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read.sample->data[j++] = sig->init;
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read.sample->length = j;
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read.sample->signals = signals_in;
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return Node::prepare();
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}
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int APINode::check() {
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for (auto &ch : read.channels) {
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if (ch->payload != PayloadType::SAMPLES)
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return -1;
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}
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for (auto &ch : write.channels) {
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if (ch->payload != PayloadType::SAMPLES)
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return -1;
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}
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return 0;
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}
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int APINode::_read(struct Sample *smps[], unsigned cnt) {
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assert(cnt == 1);
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pthread_cond_wait(&read.cv, &read.mutex);
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sample_copy(smps[0], read.sample);
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return 1;
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}
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int APINode::_write(struct Sample *smps[], unsigned cnt) {
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assert(cnt == 1);
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sample_copy(write.sample, smps[0]);
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pthread_cond_signal(&write.cv);
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return 1;
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}
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int APINode::parse(json_t *json) {
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int ret = Node::parse(json);
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if (ret)
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return ret;
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json_t *json_signals_in = nullptr;
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json_t *json_signals_out = nullptr;
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json_error_t err;
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ret = json_unpack_ex(json, &err, 0, "{ s?: { s?: o }, s?: { s?: o } }", "in",
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"signals", &json_signals_in, "out", "signals",
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&json_signals_out);
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if (ret)
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throw ConfigError(json, err, "node-config-node-api");
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if (json_signals_in)
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read.channels.parse(json_signals_in, false, true);
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if (json_signals_out)
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write.channels.parse(json_signals_out, true, false);
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return 0;
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}
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// Register node
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static char n[] = "api";
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static char d[] = "A node providing a HTTP REST interface";
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static NodePlugin<APINode, n, d,
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(int)NodeFactory::Flags::SUPPORTS_READ |
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(int)NodeFactory::Flags::SUPPORTS_WRITE,
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1>
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p;
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