VILLASnode/include/villas/api/response.hpp

/* API response.
 *
 * 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 <map>

#include <jansson.h>

#include <villas/api.hpp>
#include <villas/buffer.hpp>
#include <villas/exceptions.hpp>
#include <villas/log.hpp>
#include <villas/plugin.hpp>

namespace villas {
namespace node {
namespace api {

// Forward declarations
class Session;
class Request;

class Response {

public:
  friend Session;

  Response(Session *s, int c = HTTP_STATUS_OK,
           const std::string &ct = "text/html; charset=UTF-8",
           const Buffer &b = Buffer());

  virtual ~Response() {}

  virtual void encodeBody() {}

  int writeBody(struct lws *wsi);

  int writeHeaders(struct lws *wsi);

  void setHeader(const std::string &key, const std::string &value) {
    headers[key] = value;
  }

protected:
  Session *session;
  Logger logger;
  Buffer buffer;

  int code;
  std::string contentType;
  std::map<std::string, std::string> headers;
};

class JsonResponse : public Response {

protected:
  json_t *response;

public:
  JsonResponse(Session *s, int c, json_t *r)
      : Response(s, c, "application/json"), response(r) {}

  virtual ~JsonResponse();

  virtual void encodeBody();
};

class ErrorResponse : public JsonResponse {

public:
  ErrorResponse(Session *s, const RuntimeError &e)
      : JsonResponse(s, HTTP_STATUS_INTERNAL_SERVER_ERROR,
                     json_pack("{ s: s }", "error", e.what())) {}

  ErrorResponse(Session *s, const Error &e)
      : JsonResponse(s, e.code, json_pack("{ s: s }", "error", e.what())) {
    if (e.json)
      json_object_update(response, e.json);
  }
};

} // namespace api
} // namespace node
} // namespace villas