transmission/qt/RpcClient.cc

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// This file Copyright © 2014-2023 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#include <string_view>
#include <fmt/core.h>
#include "RpcClient.h"
#include <QApplication>
#include <QAuthenticator>
#include <QHostAddress>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <libtransmission/rpcimpl.h>
#include <libtransmission/transmission.h>
#include <libtransmission/version.h> // LONG_VERSION_STRING
#include "VariantHelpers.h"
using ::trqt::variant_helpers::dictAdd;
using ::trqt::variant_helpers::dictFind;
using ::trqt::variant_helpers::variantInit;
namespace
{
char const constexpr* const RequestDataPropertyKey{ "requestData" };
char const constexpr* const RequestFutureinterfacePropertyKey{ "requestReplyFutureInterface" };
TrVariantPtr createVariant()
{
return std::make_shared<tr_variant>();
}
} // namespace
RpcClient::RpcClient(QObject* parent)
: QObject{ parent }
{
qRegisterMetaType<TrVariantPtr>("TrVariantPtr");
}
void RpcClient::stop()
{
session_ = nullptr;
session_id_.clear();
url_.clear();
request_.reset();
if (nam_ != nullptr)
{
nam_->deleteLater();
nam_ = nullptr;
}
}
void RpcClient::start(tr_session* session)
{
session_ = session;
}
void RpcClient::start(QUrl const& url)
{
url_ = url;
request_.reset();
}
bool RpcClient::isLocal() const
{
if (session_ != nullptr)
{
return true;
}
if (QHostAddress(url_.host()).isLoopback())
{
return true;
}
return false;
}
QUrl const& RpcClient::url() const
{
return url_;
}
RpcResponseFuture RpcClient::exec(tr_quark method, tr_variant* args)
{
return exec(tr_quark_get_string_view(method), args);
}
RpcResponseFuture RpcClient::exec(std::string_view method, tr_variant* args)
{
TrVariantPtr const json = createVariant();
tr_variantInitDict(json.get(), 3);
dictAdd(json.get(), TR_KEY_method, method);
if (args != nullptr) // if args were passed in, use them
{
auto* child = tr_variantDictFind(json.get(), TR_KEY_arguments);
if (child == nullptr)
{
child = tr_variantDictAddDict(json.get(), TR_KEY_arguments, 0);
}
std::swap(*child, *args);
}
return sendRequest(json);
}
int64_t RpcClient::getNextTag()
{
return next_tag_++;
}
void RpcClient::sendNetworkRequest(TrVariantPtr json, QFutureInterface<RpcResponse> const& promise)
{
if (!request_)
{
QNetworkRequest request;
request.setUrl(url_);
request.setRawHeader(
"User-Agent",
(QApplication::applicationName() + QLatin1Char('/') + QString::fromUtf8(LONG_VERSION_STRING)).toUtf8());
request.setRawHeader("Content-Type", "application/json; charset=UTF-8");
if (!session_id_.isEmpty())
{
request.setRawHeader(TR_RPC_SESSION_ID_HEADER, session_id_.toUtf8());
}
request_ = request;
}
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auto const json_data = QByteArray::fromStdString(tr_variant_serde::json().compact().to_string(*json));
QNetworkReply* reply = networkAccessManager()->post(*request_, json_data);
reply->setProperty(RequestDataPropertyKey, QVariant::fromValue(json));
reply->setProperty(RequestFutureinterfacePropertyKey, QVariant::fromValue(promise));
connect(reply, &QNetworkReply::downloadProgress, this, &RpcClient::dataReadProgress);
connect(reply, &QNetworkReply::uploadProgress, this, &RpcClient::dataSendProgress);
if (verbose_)
{
qInfo() << "sending"
<< "POST" << qPrintable(url_.path());
for (QByteArray const& b : request_->rawHeaderList())
{
qInfo() << b.constData() << ": " << request_->rawHeader(b).constData();
}
qInfo() << "Body:";
qInfo() << json_data.constData();
}
}
void RpcClient::sendLocalRequest(TrVariantPtr json, QFutureInterface<RpcResponse> const& promise, int64_t tag)
{
if (verbose_)
{
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fmt::print("{:s}:{:d} sending req:\n{:s}\n", __FILE__, __LINE__, tr_variant_serde::json().to_string(*json));
}
local_requests_.try_emplace(tag, promise);
tr_rpc_request_exec_json(session_, json.get(), localSessionCallback, this);
}
RpcResponseFuture RpcClient::sendRequest(TrVariantPtr json)
{
int64_t const tag = getNextTag();
dictAdd(json.get(), TR_KEY_tag, tag);
QFutureInterface<RpcResponse> promise;
promise.setExpectedResultCount(1);
promise.setProgressRange(0, 1);
promise.setProgressValue(0);
promise.reportStarted();
if (session_ != nullptr)
{
sendLocalRequest(json, promise, tag);
}
else if (!url_.isEmpty())
{
sendNetworkRequest(json, promise);
}
return promise.future();
}
QNetworkAccessManager* RpcClient::networkAccessManager()
{
if (nam_ == nullptr)
{
nam_ = new QNetworkAccessManager{};
connect(nam_, &QNetworkAccessManager::finished, this, &RpcClient::networkRequestFinished);
connect(nam_, &QNetworkAccessManager::authenticationRequired, this, &RpcClient::httpAuthenticationRequired);
}
return nam_;
}
void RpcClient::localSessionCallback(tr_session* s, tr_variant* response, void* vself) noexcept
{
Q_UNUSED(s)
auto* self = static_cast<RpcClient*>(vself);
if (self->verbose_)
{
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fmt::print("{:s}:{:d} got response:\n{:s}\n", __FILE__, __LINE__, tr_variant_serde::json().to_string(*response));
}
TrVariantPtr const json = createVariant();
std::swap(*json, *response);
variantInit(response, false);
// this callback is invoked in the libtransmission thread, so we don't want
// to process the response here... let's push it over to the Qt thread.
QMetaObject::invokeMethod(self, "localRequestFinished", Qt::QueuedConnection, Q_ARG(TrVariantPtr, json));
}
void RpcClient::networkRequestFinished(QNetworkReply* reply)
{
reply->deleteLater();
auto promise = reply->property(RequestFutureinterfacePropertyKey).value<QFutureInterface<RpcResponse>>();
if (verbose_)
{
qInfo() << "http response header:";
for (QByteArray const& b : reply->rawHeaderList())
{
qInfo() << b.constData() << ": " << reply->rawHeader(b).constData();
}
qInfo() << "json:";
qInfo() << reply->peek(reply->bytesAvailable()).constData();
}
if (reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt() == 409 &&
reply->hasRawHeader(TR_RPC_SESSION_ID_HEADER))
{
// we got a 409 telling us our session id has expired.
// update it and resubmit the request.
session_id_ = QString::fromUtf8(reply->rawHeader(TR_RPC_SESSION_ID_HEADER));
request_.reset();
sendNetworkRequest(reply->property(RequestDataPropertyKey).value<TrVariantPtr>(), promise);
return;
}
emit networkResponse(reply->error(), reply->errorString());
if (reply->error() != QNetworkReply::NoError)
{
RpcResponse result;
result.networkError = reply->error();
promise.setProgressValueAndText(1, reply->errorString());
promise.reportFinished(&result);
}
else
{
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auto const json_data = reply->readAll().trimmed().toStdString();
auto const json = createVariant();
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auto result = RpcResponse{};
if (auto top = tr_variant_serde::json().parse(json_data); top)
{
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std::swap(*json, *top);
result = parseResponseData(*json);
}
promise.setProgressValue(1);
promise.reportFinished(&result);
}
}
void RpcClient::localRequestFinished(TrVariantPtr response)
{
if (auto node = local_requests_.extract(parseResponseTag(*response)); node)
{
auto const result = parseResponseData(*response);
auto& promise = node.mapped();
promise.setProgressRange(0, 1);
promise.setProgressValue(1);
promise.reportFinished(&result);
}
}
int64_t RpcClient::parseResponseTag(tr_variant& response) const
{
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return dictFind<int>(&response, TR_KEY_tag).value_or(-1);
}
RpcResponse RpcClient::parseResponseData(tr_variant& response) const
{
RpcResponse ret;
if (auto const result = dictFind<QString>(&response, TR_KEY_result); result)
{
ret.result = *result;
ret.success = *result == QStringLiteral("success");
}
if (tr_variant* args = nullptr; tr_variantDictFindDict(&response, TR_KEY_arguments, &args))
{
ret.args = createVariant();
std::swap(*ret.args, *args);
variantInit(args, false);
}
return ret;
}