mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-09 00:00:00 +01:00
134 lines
3.6 KiB
C++
134 lines
3.6 KiB
C++
/** The "stats" API request.
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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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extern "C" {
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#include <graphviz/gvc.h>
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}
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#include <villas/timing.h>
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#include <villas/api/request.hpp>
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#include <villas/api/response.hpp>
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namespace villas {
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namespace node {
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namespace api {
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class GraphRequest : public Request {
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protected:
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GVC_t *gvc;
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std::string layout;
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std::string format;
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public:
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GraphRequest(Session *s) :
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Request(s),
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gvc(gvContext()),
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layout(getQueryArg("layout"))
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{
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if (layout.empty())
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layout = "neato";
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}
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~GraphRequest()
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{
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gvFreeContext(gvc);
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}
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virtual Response * execute()
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{
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if (method != Session::Method::GET)
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throw InvalidMethod(this);
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if (body != nullptr)
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throw BadRequest("Status endpoint does not accept any body data");
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auto *sn = session->getSuperNode();
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auto *graph = sn->getGraph();
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char *data;
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unsigned len;
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std::list<std::string> supportedLayouts = { "circo", "dot", "fdp", "neato", "nop", "nop1", "nop2", "osage", "patchwork", "sfdp", "twopi" };
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std::list<std::string> supportedFormats = { "ps", "eps", "txt", "svg", "svgz", "gif", "png", "jpg", "jpeg", "bmp", "dot", "fig", "json", "pdf" };
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format = matches[1];
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auto lit = std::find(supportedLayouts.begin(), supportedLayouts.end(), layout);
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if (lit == supportedLayouts.end())
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throw BadRequest("Unsupported layout: {}", layout);
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auto fit = std::find(supportedFormats.begin(), supportedFormats.end(), format);
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if (fit == supportedFormats.end())
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throw BadRequest("Unsupported format: {}", format);
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std::string ct = "text/plain";
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if (format == "svg")
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ct = "image/svg+xml";
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else if (format == "eps" || format == "ps")
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ct = "application/postscript";
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else if (format == "txt")
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ct = "text/plain";
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else if (format == "gif")
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ct = "image/gif";
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else if (format == "png")
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ct = "image/png";
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else if (format == "jpg" || format == "jpeg")
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ct = "image/jpeg";
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else if (format == "bmp")
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ct = "image/bmp";
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else if (format == "dot")
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ct = "text/vnd.graphviz";
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else if (format == "json")
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ct = "application/json";
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else if (format == "pdf")
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ct = "application/pdf";
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gvLayout(gvc, graph, layout.c_str());
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gvRenderData(gvc, graph, format.c_str(), &data, &len);
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auto buf = Buffer(data, len);
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auto *resp = new Response(session, HTTP_STATUS_OK, ct, buf);
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if (format == "svgz")
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resp->setHeader("Content-Encoding", "gzip");
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#if 0
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gvFreeRenderData(data);
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#endif
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gvFreeLayout(gvc, graph);
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return resp;
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}
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};
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/* Register API request */
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static char n[] = "graph";
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static char r[] = "/graph\\.([a-z]+)";
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static char d[] = "get graph representation of configuration";
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static RequestPlugin<GraphRequest, n, r, d> p;
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} /* namespace api */
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} /* namespace node */
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} /* namespace villas */
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