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ProtocolServer: Stream the downloaded data if possible

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This patchset makes ProtocolServer stream the downloads to its client
(LibProtocol), and as such changes the download API; a possible
download lifecycle could be as such:
notation = client->server:'>', server->client:'<', pipe activity:'*'
```
> StartDownload(GET, url, headers, {})
< Response(0, fd 8)
* {data, 1024b}
< HeadersBecameAvailable(0, response_headers, 200)
< DownloadProgress(0, 4K, 1024)
* {data, 1024b}
* {data, 1024b}
< DownloadProgress(0, 4K, 2048)
* {data, 1024b}
< DownloadProgress(0, 4K, 1024)
< DownloadFinished(0, true, 4K)
```

Since managing the received file descriptor is a pain, LibProtocol
implements `Download::stream_into(OutputStream)`, which can be used to
stream the download into any given output stream (be it a file, or
memory, or writing stuff with a delay, etc.).
Also, as some of the users of this API require all the downloaded data
upfront, LibProtocol also implements `set_should_buffer_all_input()`,
which causes the download instance to buffer all the data until the
download is complete, and to call the `on_buffered_download_finish`
hook.
This commit is contained in:
AnotherTest 2020-12-26 17:14:12 +03:30 • committed by Andreas Kling
parent 36d642ee75
commit 4a2da10e38
55 changed files with 528 additions and 235 deletions
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39
Libraries/LibGemini/Job.cpp
View file

@ -33,8 +33,9 @@
namespace Gemini {
Job::Job(const GeminiRequest& request)
: m_request(request)
Job::Job(const GeminiRequest& request, OutputStream& output_stream)
: Core::NetworkJob(output_stream)
, m_request(request)
{
}
@ -42,6 +43,23 @@ Job::~Job()
{
}
void Job::flush_received_buffers()
{
for (size_t i = 0; i < m_received_buffers.size(); ++i) {
auto& payload = m_received_buffers[i];
auto written = do_write(payload);
m_received_size -= written;
if (written == payload.size()) {
// FIXME: Make this a take-first-friendly object?
m_received_buffers.take_first();
continue;
}
ASSERT(written < payload.size());
payload = payload.slice(written, payload.size() - written);
return;
}
}
void Job::on_socket_connected()
{
register_on_ready_to_write([this] {
@ -126,6 +144,7 @@ void Job::on_socket_connected()
m_received_buffers.append(payload);
m_received_size += payload.size();
flush_received_buffers();
deferred_invoke([this](auto&) { did_progress({}, m_received_size); });
@ -144,15 +163,17 @@ void Job::on_socket_connected()
void Job::finish_up()
{
m_state = State::Finished;
auto flattened_buffer = ByteBuffer::create_uninitialized(m_received_size);
u8* flat_ptr = flattened_buffer.data();
for (auto& received_buffer : m_received_buffers) {
memcpy(flat_ptr, received_buffer.data(), received_buffer.size());
flat_ptr += received_buffer.size();
flush_received_buffers();
if (m_received_size != 0) {
// FIXME: What do we do? ignore it?
// "Transmission failed" is not strictly correct, but let's roll with it for now.
deferred_invoke([this](auto&) {
did_fail(Error::TransmissionFailed);
});
return;
}
m_received_buffers.clear();
auto response = GeminiResponse::create(m_status, m_meta, move(flattened_buffer));
auto response = GeminiResponse::create(m_status, m_meta);
deferred_invoke([this, response](auto&) {
did_finish(move(response));
});