Duckstation/src/frontend-common/http_downloader.cpp

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#include "http_downloader.h"
#include "common/assert.h"
#include "common/log.h"
#include "common/timer.h"
Log_SetChannel(HTTPDownloader);
static constexpr float DEFAULT_TIMEOUT_IN_SECONDS = 30;
static constexpr u32 DEFAULT_MAX_ACTIVE_REQUESTS = 4;
namespace FrontendCommon {
const char HTTPDownloader::DEFAULT_USER_AGENT[] =
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0";
HTTPDownloader::HTTPDownloader()
: m_timeout(DEFAULT_TIMEOUT_IN_SECONDS), m_max_active_requests(DEFAULT_MAX_ACTIVE_REQUESTS)
{
}
HTTPDownloader::~HTTPDownloader() = default;
void HTTPDownloader::SetTimeout(float timeout)
{
m_timeout = timeout;
}
void HTTPDownloader::SetMaxActiveRequests(u32 max_active_requests)
{
Assert(max_active_requests > 0);
m_max_active_requests = max_active_requests;
}
void HTTPDownloader::CreateRequest(std::string url, Request::Callback callback)
{
Request* req = InternalCreateRequest();
req->parent = this;
req->type = Request::Type::Get;
req->url = std::move(url);
req->callback = std::move(callback);
req->start_time = Common::Timer::GetValue();
std::unique_lock<std::mutex> lock(m_pending_http_request_lock);
if (LockedGetActiveRequestCount() < m_max_active_requests)
{
if (!StartRequest(req))
return;
}
LockedAddRequest(req);
}
void HTTPDownloader::CreatePostRequest(std::string url, std::string post_data, Request::Callback callback)
{
Request* req = InternalCreateRequest();
req->parent = this;
req->type = Request::Type::Post;
req->url = std::move(url);
req->post_data = std::move(post_data);
req->callback = std::move(callback);
req->start_time = Common::Timer::GetValue();
std::unique_lock<std::mutex> lock(m_pending_http_request_lock);
if (LockedGetActiveRequestCount() < m_max_active_requests)
{
if (!StartRequest(req))
return;
}
LockedAddRequest(req);
}
void HTTPDownloader::LockedPollRequests(std::unique_lock<std::mutex>& lock)
{
if (m_pending_http_requests.empty())
return;
InternalPollRequests();
const Common::Timer::Value current_time = Common::Timer::GetValue();
u32 active_requests = 0;
u32 unstarted_requests = 0;
for (size_t index = 0; index < m_pending_http_requests.size();)
{
Request* req = m_pending_http_requests[index];
if (req->state == Request::State::Pending)
{
unstarted_requests++;
index++;
continue;
}
if (req->state == Request::State::Started && current_time >= req->start_time &&
Common::Timer::ConvertValueToSeconds(current_time - req->start_time) >= m_timeout)
{
// request timed out
Log_ErrorPrintf("Request for '%s' timed out", req->url.c_str());
req->state.store(Request::State::Cancelled);
m_pending_http_requests.erase(m_pending_http_requests.begin() + index);
lock.unlock();
req->callback(-1, Request::Data());
CloseRequest(req);
lock.lock();
continue;
}
if (req->state != Request::State::Complete)
{
active_requests++;
index++;
continue;
}
// request complete
Log_VerbosePrintf("Request for '%s' complete, returned status code %u and %zu bytes", req->url.c_str(),
req->status_code, req->data.size());
m_pending_http_requests.erase(m_pending_http_requests.begin() + index);
// run callback with lock unheld
lock.unlock();
req->callback(req->status_code, req->data);
CloseRequest(req);
lock.lock();
}
// start new requests when we finished some
if (unstarted_requests > 0 && active_requests < m_max_active_requests)
{
for (size_t index = 0; index < m_pending_http_requests.size();)
{
Request* req = m_pending_http_requests[index];
if (req->state != Request::State::Pending)
{
index++;
continue;
}
if (!StartRequest(req))
{
m_pending_http_requests.erase(m_pending_http_requests.begin() + index);
continue;
}
active_requests++;
index++;
if (active_requests >= m_max_active_requests)
break;
}
}
}
void HTTPDownloader::PollRequests()
{
std::unique_lock<std::mutex> lock(m_pending_http_request_lock);
LockedPollRequests(lock);
}
void HTTPDownloader::WaitForAllRequests()
{
std::unique_lock<std::mutex> lock(m_pending_http_request_lock);
while (!m_pending_http_requests.empty())
LockedPollRequests(lock);
}
void HTTPDownloader::LockedAddRequest(Request* request)
{
m_pending_http_requests.push_back(request);
}
u32 HTTPDownloader::LockedGetActiveRequestCount()
{
u32 count = 0;
for (Request* req : m_pending_http_requests)
{
if (req->state == Request::State::Started || req->state == Request::State::Receiving)
count++;
}
return count;
}
} // namespace FrontendCommon