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VILLASnode/include/villas/api/request.hpp

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/* API Request.
*
* Author: Steffen Vogel <post@steffenvogel.de>
* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
#include <jansson.h>
#include <regex>
#include <vector>
#include <villas/api/session.hpp>
#include <villas/buffer.hpp>
#include <villas/log.hpp>
#include <villas/plugin.hpp>
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#include <villas/super_node.hpp>
#define RE_UUID \
"[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{" \
"12}"
namespace villas {
namespace node {
namespace api {
// Forward declarations
class Session;
class Response;
class RequestFactory;
class Request {
friend Session;
friend RequestFactory;
friend Response;
protected:
Session *session;
Logger logger;
Buffer buffer;
public:
std::vector<std::string> matches;
Session::Method method;
unsigned long contentLength;
json_t *body;
RequestFactory *factory;
Request(Session *s)
: session(s), method(Session::Method::UNKNOWN), contentLength(0),
body(nullptr), factory(nullptr) {}
virtual ~Request() {
if (body)
json_decref(body);
}
virtual void prepare() {}
virtual Response *execute() = 0;
virtual void decode();
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const std::string &getMatch(int idx) const { return matches[idx]; }
std::string getQueryArg(const std::string &arg) {
char buf[1024];
const char *val;
val = lws_get_urlarg_by_name(session->wsi, (arg + "=").c_str(), buf,
sizeof(buf));
return val ? std::string(val) : std::string();
}
std::string getHeader(enum lws_token_indexes hdr) {
char buf[1024];
lws_hdr_copy(session->wsi, buf, sizeof(buf), hdr);
return std::string(buf);
}
virtual std::string toString();
};
class RequestFactory : public plugin::Plugin {
public:
using plugin::Plugin::Plugin;
virtual bool match(const std::string &uri, std::smatch &m) const = 0;
virtual Request *make(Session *s) = 0;
static Request *create(Session *s, const std::string &uri,
Session::Method meth, unsigned long ct);
virtual void init(Request *r) { r->logger = getLogger(); }
virtual std::string getType() const { return "api:request"; }
virtual bool isHidden() const { return false; }
};
template <typename T, const char *name, const char *re, const char *desc>
class RequestPlugin : public RequestFactory {
protected:
std::regex regex;
public:
RequestPlugin() : RequestFactory(), regex(re) {}
virtual Request *make(Session *s) {
auto *r = new T(s);
init(r);
return r;
}
// Get plugin name
virtual std::string getName() const { return name; }
// Get plugin description
virtual std::string getDescription() const { return desc; }
virtual bool match(const std::string &uri, std::smatch &match) const {
return std::regex_match(uri, match, regex);
}
};
} // namespace api
} // namespace node
} // namespace villas