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125 lines
4.1 KiB
C++
125 lines
4.1 KiB
C++
/* -------------------------------------------------------------------------- */
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/* Copyright 2002-2024, OpenNebula Project, OpenNebula Systems */
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/* */
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/* Licensed under the Apache License, Version 2.0 (the "License"); you may */
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/* not use this file except in compliance with the License. You may obtain */
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/* a copy of the License at */
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/* */
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/* http://www.apache.org/licenses/LICENSE-2.0 */
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/* */
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/* Unless required by applicable law or agreed to in writing, software */
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/* distributed under the License is distributed on an "AS IS" BASIS, */
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/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
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/* See the License for the specific language governing permissions and */
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/* limitations under the License. */
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/* -------------------------------------------------------------------------- */
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#include <curl/curl.h>
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#include <string>
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/* Class for sedning Http requests and receiving responses.
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* Note: Very simple implementation:
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* - no consistency check
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* - no checks if the response is in correct format
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* - almost no error handling
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*/
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class HttpRequest
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{
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public:
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HttpRequest();
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~HttpRequest();
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/** Send a POST request, receive response as JSON
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* @param url Address
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* @param data Data to send in json format
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* @param response In case of success full response from server in json format,
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* the caller should extract the data from { json : {...} }.
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* Contains error string in case of failure.
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* @return 0 on success, -1 otherwise
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*/
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int post_json(const std::string& url, const std::string& data, std::string& response);
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int post_json(const std::string& data, std::string& response)
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{
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return post_json(_url, data, response);
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}
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/** Send a GET request, receive response as JSON
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* @param url Address
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* @param response In case of success full response from server in json format,
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* the caller should extract the data from { json : {...} }.
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* Contains error string in case of failure.
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* @return 0 on success, -1 otherwise
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*/
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int get_json(const std::string& url, std::string& response);
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int get_json(std::string& response)
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{
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return get_json(_url, response);
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}
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bool is_initialized() const
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{
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return !_url.empty();
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}
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/**
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* Set server url adress, in the form "scheme://host:port/path "
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*/
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void set_server(const std::string& url)
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{
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_url = url;
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}
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/**
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* Set maximum time in seconds that transfer operation can take.
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* 0 -> Use curl default value
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* See curl CURLOPT_TIMEOUT for more info
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*/
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void set_timeout(long timeout)
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{
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_timeout = timeout;
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}
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/**
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* Set proxy server, including protocol and port. Example "http://example.com:1234"
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* See curl CURLOPT_PROXY for more info
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*/
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void set_proxy(const std::string& proxy)
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{
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_proxy = proxy;
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}
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private:
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/**
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* Callback method for writing response of curl operation to string
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* See curl CURLOPT_WRITEFUNCTION for more info
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*/
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static size_t write_to_string(void *ptr, size_t size, size_t count, void *str);
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/**
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* Check curl response, eventually set error message
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* @param curl Pointer to curl handle
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* @param error Contains error message if any
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* @return 0 on success, -1 otherwise
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*/
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static int check_http_code(CURL* curl, std::string& msg);
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/**
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* Server url adress
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*/
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std::string _url;
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/**
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* Maximum time in seconds that transfer operation can take.
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* 0 -> Use curl default value
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*/
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long _timeout = 0;
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/**
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* Curl proxy server, including the protocol and port.
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*/
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std::string _proxy;
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};
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