mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-09 00:00:00 +01:00
128 lines
3.1 KiB
C++
128 lines
3.1 KiB
C++
/* Print hook.
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*
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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 <cstdio>
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#include <cstring>
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#include <villas/format.hpp>
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#include <villas/hook.hpp>
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#include <villas/node.hpp>
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#include <villas/path.hpp>
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#include <villas/sample.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::Ptr formatter;
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std::string prefix;
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std::string output_path;
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FILE *output;
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std::vector<char> output_buffer;
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public:
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PrintHook(Path *p, Node *n, int fl, int prio, bool en = true)
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: Hook(p, n, fl, prio, en), output(nullptr) {}
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virtual void start() {
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assert(state == State::PREPARED || state == State::STOPPED);
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if (!output_path.empty()) {
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output = fopen(output_path.c_str(), "w+");
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if (!output)
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throw SystemError("Failed to open file");
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} else
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output_buffer = std::vector<char>(DEFAULT_FORMAT_BUFFER_LENGTH);
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formatter->start(signals);
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state = State::STARTED;
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}
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virtual void stop() {
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if (output)
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fclose(output);
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}
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virtual void parse(json_t *json) {
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const char *p = nullptr;
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const char *o = 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::INITIALIZED || state == State::CHECKED ||
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state == State::PARSED);
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Hook::parse(json);
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ret = json_unpack_ex(json, &err, 0, "{ s?: s, s?: o, s?: s }", "prefix", &p,
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"format", &json_format, "output", &o);
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if (ret)
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throw ConfigError(json, err, "node-config-hook-print");
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if (p && o) {
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throw ConfigError(json, "node-config-hook-print",
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"Prefix and output settings are exclusive.");
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}
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if (p)
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prefix = p;
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if (o)
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output_path = o;
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// Format
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auto *fmt = json_format ? FormatFactory::make(json_format)
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: FormatFactory::make("villas.human");
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formatter = Format::Ptr(fmt);
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if (!formatter)
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throw ConfigError(json_format, "node-config-hook-print-format",
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"Invalid format configuration");
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state = State::PARSED;
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}
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virtual Hook::Reason process(struct Sample *smp) {
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assert(state == State::STARTED);
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if (!output) {
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char *buf = output_buffer.data();
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size_t buflen = output_buffer.size();
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size_t wbytes;
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formatter->sprint(buf, buflen, &wbytes, smp);
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if (wbytes > 0 && buf[wbytes - 1] == '\n')
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buf[wbytes - 1] = 0;
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if (node)
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logger->info("{}{} {}", prefix, node->getName(), buf);
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else if (path)
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logger->info("{}{} {}", prefix, path->toString(), buf);
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} else
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formatter->print(output, 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 or a file";
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static HookPlugin<PrintHook, n, d,
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(int)Hook::Flags::NODE_READ | (int)Hook::Flags::NODE_WRITE |
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(int)Hook::Flags::PATH>
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p;
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} // namespace node
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} // namespace villas
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