mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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147 lines
3.2 KiB
C++
147 lines
3.2 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 <cstdio>
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#include <cstring>
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#include <villas/node.h>
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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/format.hpp>
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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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Format *formatter;
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FILE *stream;
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std::string prefix;
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std::string 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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formatter(nullptr),
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stream(nullptr)
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{ }
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virtual ~PrintHook()
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{
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if (formatter)
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delete formatter;
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}
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virtual void start()
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{
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assert(state == State::PREPARED || state == State::STOPPED);
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formatter->start(&signals);
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stream = !uri.empty() ? fopen(uri.c_str(), "a+") : stdout;
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if (!stream)
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throw SystemError("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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assert(state == State::STARTED);
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if (stream != stdout)
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fclose(stream);
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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 *p = nullptr, *u = nullptr;
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int ret;
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json_error_t err;
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json_t *json_format = nullptr;
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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?: o }",
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"output", &u,
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"prefix", &p,
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"format", &json_format
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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 = p;
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if (u)
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uri = u;
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/* Format */
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formatter = json_format
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? FormatFactory::make(json_format)
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: FormatFactory::make("villas.human");
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if (!formatter)
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throw ConfigError(json_format, "node-config-hook-print-format", "Invalid format configuration");
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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 (stream == stdout) {
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if (!prefix.empty())
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std::cout << prefix.c_str();
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else if (node)
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std::cout << "Node " << *node << ": ";
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else if (path)
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std::cout << "Path " << *path << ": ";
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}
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formatter->print(stream, smp);
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return Reason::OK;
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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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