HueCommandAPI.cpp
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/**
\file HueCommandAPI.h
Copyright Notice\n
Copyright (C) 2018 Jan Rogall - developer\n
Copyright (C) 2018 Moritz Wirger - developer\n
This file is part of hueplusplus.
hueplusplus is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
hueplusplus is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with hueplusplus. If not, see <http://www.gnu.org/licenses/>.
**/
#include "hueplusplus/HueCommandAPI.h"
#include <thread>
#include "hueplusplus/LibConfig.h"
#include "hueplusplus/HueExceptionMacro.h"
namespace hueplusplus
{
namespace
{
// Runs functor with appropriate timeout and retries when timed out or connection reset
template <typename Timeout, typename Fun>
nlohmann::json RunWithTimeout(std::shared_ptr<Timeout> timeout, std::chrono::steady_clock::duration minDelay, Fun fun)
{
auto now = std::chrono::steady_clock::now();
std::lock_guard<std::mutex> lock(timeout->mutex);
if (timeout->timeout > now)
{
std::this_thread::sleep_until(timeout->timeout);
}
try
{
nlohmann::json response = fun();
timeout->timeout = now + minDelay;
return response;
}
catch (const std::system_error& e)
{
if (e.code() == std::errc::connection_reset || e.code() == std::errc::timed_out)
{
// Happens when hue is too busy, wait and try again (once)
std::this_thread::sleep_for(minDelay);
nlohmann::json v = fun();
timeout->timeout = std::chrono::steady_clock::now() + minDelay;
return v;
}
// Cannot recover from other types of errors
throw;
}
}
} // namespace
HueCommandAPI::HueCommandAPI(
const std::string& ip, const int port, const std::string& username, std::shared_ptr<const IHttpHandler> httpHandler)
: ip(ip),
port(port),
username(username),
httpHandler(std::move(httpHandler)),
timeout(new TimeoutData {std::chrono::steady_clock::now(), {}})
{}
nlohmann::json HueCommandAPI::PUTRequest(const std::string& path, const nlohmann::json& request) const
{
return PUTRequest(path, request, CURRENT_FILE_INFO);
}
nlohmann::json HueCommandAPI::PUTRequest(
const std::string& path, const nlohmann::json& request, FileInfo fileInfo) const
{
return HandleError(std::move(fileInfo), RunWithTimeout(timeout, Config::instance().getBridgeRequestDelay(), [&]() {
return httpHandler->PUTJson(combinedPath(path), request, ip, port);
}));
}
nlohmann::json HueCommandAPI::GETRequest(const std::string& path, const nlohmann::json& request) const
{
return GETRequest(path, request, CURRENT_FILE_INFO);
}
nlohmann::json HueCommandAPI::GETRequest(
const std::string& path, const nlohmann::json& request, FileInfo fileInfo) const
{
return HandleError(std::move(fileInfo), RunWithTimeout(timeout, Config::instance().getBridgeRequestDelay(), [&]() {
return httpHandler->GETJson(combinedPath(path), request, ip, port);
}));
}
nlohmann::json HueCommandAPI::DELETERequest(const std::string& path, const nlohmann::json& request) const
{
return DELETERequest(path, request, CURRENT_FILE_INFO);
}
nlohmann::json HueCommandAPI::DELETERequest(
const std::string& path, const nlohmann::json& request, FileInfo fileInfo) const
{
return HandleError(std::move(fileInfo), RunWithTimeout(timeout, Config::instance().getBridgeRequestDelay(), [&]() {
return httpHandler->DELETEJson(combinedPath(path), request, ip, port);
}));
}
nlohmann::json HueCommandAPI::POSTRequest(const std::string& path, const nlohmann::json& request) const
{
return POSTRequest(path, request, CURRENT_FILE_INFO);
}
nlohmann::json HueCommandAPI::POSTRequest(
const std::string& path, const nlohmann::json& request, FileInfo fileInfo) const
{
return HandleError(std::move(fileInfo), RunWithTimeout(timeout, Config::instance().getBridgeRequestDelay(), [&]() {
return httpHandler->POSTJson(combinedPath(path), request, ip, port);
}));
}
nlohmann::json HueCommandAPI::HandleError(FileInfo fileInfo, const nlohmann::json& response) const
{
if (response.count("error"))
{
throw HueAPIResponseException::Create(std::move(fileInfo), response);
}
else if (response.is_array())
{
// Check if array contains error response
auto it
= std::find_if(response.begin(), response.end(), [](const nlohmann::json& v) { return v.count("error"); });
if (it != response.end())
{
throw HueAPIResponseException::Create(std::move(fileInfo), it.value());
}
}
return response;
}
std::string HueCommandAPI::combinedPath(const std::string& path) const
{
std::string result = "/api/";
result.append(username);
// If path does not begin with '/', insert it unless it is empty
if (!path.empty() && path.front() != '/')
{
result.append("/");
}
result.append(path);
return result;
}
} // namespace hueplusplus