mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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159 lines
3.3 KiB
C++
159 lines
3.3 KiB
C++
/** Print hook.
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014-2020, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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/** @addtogroup hooks Hook functions
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* @{
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*/
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#include <cstring>
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#include <villas/hook.hpp>
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#include <villas/path.h>
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#include <villas/sample.h>
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#include <villas/io.h>
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#include <villas/plugin.h>
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namespace villas {
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namespace node {
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class PrintHook : public Hook {
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protected:
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struct io io;
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struct format_type *format;
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char *prefix;
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char *uri;
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public:
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PrintHook(struct vpath *p, struct vnode *n, int fl, int prio, bool en = true) :
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Hook(p, n, fl, prio, en),
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io(),
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prefix(nullptr),
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uri(nullptr)
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{
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format = format_type_lookup("villas.human");
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}
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virtual void start()
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{
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int ret;
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assert(state == State::PREPARED || state == State::STOPPED);
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ret = io_init(&io, format, &signals, (int) SampleFlags::HAS_ALL);
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if (ret)
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throw RuntimeError("Failed to initialze IO");
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ret = io_open(&io, uri);
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if (ret)
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throw RuntimeError("Failed to open IO");
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state = State::STARTED;
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}
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virtual void stop()
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{
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int ret;
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assert(state == State::STARTED);
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ret = io_close(&io);
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if (ret)
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throw RuntimeError("Failed to close IO");
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ret = io_destroy(&io);
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if (ret)
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throw RuntimeError("Failed to destroy IO");
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state = State::STOPPED;
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}
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virtual void parse(json_t *json)
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{
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const char *f = nullptr, *p = nullptr, *u = nullptr;
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int ret;
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json_error_t err;
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assert(state != State::STARTED);
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Hook::parse(json);
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ret = json_unpack_ex(json, &err, 0, "{ s?: s, s?: s, s?: s }",
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"output", &u,
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"prefix", &p,
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"format", &f
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);
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if (ret)
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throw ConfigError(json, err, "node-config-hook-print");
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if (p)
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prefix = strdup(p);
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if (u)
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uri = strdup(u);
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if (f) {
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format = format_type_lookup(f);
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if (!format)
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throw ConfigError(json, "node-config-hook-print-format", "Invalid IO format '{}'", f);
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}
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state = State::PARSED;
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}
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virtual Hook::Reason process(sample *smp)
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{
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assert(state == State::STARTED);
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if (prefix)
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printf("%s", prefix);
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else if (node)
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printf("Node %s: ", node_name(node));
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else if (path)
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printf("Path %s: ", path_name(path));
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io_print(&io, &smp, 1);
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return Reason::OK;
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}
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virtual ~PrintHook()
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{
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if (uri)
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free(uri);
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if (prefix)
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free(prefix);
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}
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};
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/* Register hook */
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static char n[] = "print";
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static char d[] = "Print the message to stdout";
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static HookPlugin<PrintHook, n, d, (int) Hook::Flags::NODE_READ | (int) Hook::Flags::NODE_WRITE | (int) Hook::Flags::PATH> p;
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} /* namespace node */
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} /* namespace villas */
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/** @} */
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