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#include "guppyclient.hpp"
#include "ioutil.hpp"
#include "kristall.hpp"
GuppyClient::GuppyClient(QObject *parent) : ProtocolHandler(parent)
{
connect(&socket, &QUdpSocket::connected, this, &GuppyClient::on_connected);
connect(&socket, &QUdpSocket::readyRead, this, &GuppyClient::on_readRead);
connect(&timer, &QTimer::timeout, this, &GuppyClient::on_timerTick);
connect(&socket, &QAbstractSocket::hostFound, this, [this]() {
emit this->requestStateChange(RequestState::HostFound);
});
emit this->requestStateChange(RequestState::None);
}
GuppyClient::~GuppyClient()
{
}
bool GuppyClient::supportsScheme(const QString &scheme) const
{
return (scheme == "guppy");
}
bool GuppyClient::startRequest(const QUrl &url, RequestOptions options)
{
Q_UNUSED(options)
if(this->isInProgress())
return false;
if(url.scheme() != "guppy")
return false;
emit this->requestStateChange(RequestState::Started);
this->requested_url = url;
this->was_cancelled = false;
this->prev_seq = 0;
this->first_seq = 0;
this->last_seq = 0;
this->socket.connectToHost(url.host(), url.port(6775));
return true;
}
bool GuppyClient::isInProgress() const
{
return this->socket.isOpen();
}
bool GuppyClient::cancelRequest()
{
was_cancelled = true;
this->socket.close();
this->timer.stop();
this->body.clear();
this->chunks.clear();
return true;
}
void GuppyClient::on_connected()
{
request = (this->requested_url.toString(QUrl::FormattingOptions(QUrl::FullyEncoded)) + "\r\n").toUtf8();
if(this->socket.write(request.constData(), request.size()) <= 0)
{
this->socket.close();
return;
}
this->timer.start(2000);
emit this->requestStateChange(RequestState::Connected);
}
void GuppyClient::on_readRead()
{
QByteArray chunk = this->socket.read(65535);
if(int crlf = chunk.indexOf("\r\n"); crlf > 0) {
QByteArray header = chunk.left(crlf);
// first response packet (success, error or redirect) header should contain a space
int seq = -1;
if(int space = header.indexOf(' '); space > 0) {
QByteArray meta = header.mid(space + 1);
seq = chunk.left(space).toInt();
if(seq < 6 || seq > 2147483647) {
this->timer.stop();
this->body.clear();
this->chunks.clear();
emit this->requestStateChange(RequestState::None);
if(seq == 4) {
emit networkError(UnknownError, meta); // error
}
else if(seq == 3) { // redirect
QUrl new_url(meta);
if(new_url.isRelative()) new_url = this->requested_url.resolved(new_url);
assert(not new_url.isRelative());
this->socket.close();
this->timer.stop();
this->body.clear();
this->chunks.clear();
emit this->requestStateChange(RequestState::None);
emit redirected(new_url, false);
}
else if(seq == 1) { // input prompt
this->socket.close();
this->timer.stop();
this->body.clear();
this->chunks.clear();
emit this->requestStateChange(RequestState::None);
emit inputRequired(meta, false);
}
else {
emit networkError(ProtocolViolation, QObject::tr("invalid seq"));
}
return;
}
this->first_seq = seq; // success
this->mime = meta;
}
else {
seq = header.toInt();
}
if(seq < this->first_seq) {
return;
}
if(chunk.size() == crlf + 2) { // eof
last_seq = seq;
}
else if(seq >= first_seq) { // success or continuation
if(!this->prev_seq || seq >= this->prev_seq) {
this->chunks[seq] = chunk.mid(crlf + 2, chunk.size() - crlf - 2);
}
// postpone the timer when we receive the next packet
if(seq == this->prev_seq + 1) {
this->timer.start();
}
}
// acknowledge every valid packet we receive
QByteArray ack = QString("%1\r\n").arg(seq).toUtf8();
socket.write(ack.constData(), ack.size());
}
else {
emitNetworkError(this->socket.error(), this->socket.errorString());
return;
}
// append all consequent chunks we have
int next_seq = this->prev_seq ? this->prev_seq + 1 : this->first_seq;
while(next_seq != last_seq) {
QByteArray next = this->chunks.take(next_seq);
if(next.isNull()) {
break;
}
body.append(next.constData(), next.size());
this->prev_seq = next_seq++;
}
if(not this->was_cancelled) {
emit this->requestProgress(body.size());
}
// we're done when the last appended chunk is the one before the eof chunk
if(this->last_seq && next_seq == this->last_seq) {
if(not this->was_cancelled) {
emit this->requestComplete(this->body, this->mime);
this->was_cancelled = true;
}
this->socket.close();
this->timer.stop();
this->body.clear();
this->chunks.clear();
emit this->requestStateChange(RequestState::None);
}
}
void GuppyClient::on_timerTick()
{
QByteArray pkt;
if(this->prev_seq) { // resend the last ack
pkt = QString("%1\r\n").arg(this->prev_seq).toUtf8();
}
else if(this->chunks.empty()) { // resend the request
pkt = request;
}
else {
return;
}
this->socket.write(pkt.constData(), pkt.size());
}
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