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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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10
Services/ProtocolServer/GeminiDownload.cpp
View file

@ -30,13 +30,13 @@
namespace ProtocolServer {
GeminiDownload::GeminiDownload(ClientConnection& client, NonnullRefPtr<Gemini::GeminiJob> job)
: Download(client)
GeminiDownload::GeminiDownload(ClientConnection& client, NonnullRefPtr<Gemini::GeminiJob> job, NonnullOwnPtr<OutputFileStream>&& output_stream)
: Download(client, move(output_stream))
, m_job(job)
{
m_job->on_finish = [this](bool success) {
if (auto* response = m_job->response()) {
set_payload(response->payload());
set_downloaded_size(this->output_stream().size());
if (!response->meta().is_empty()) {
HashMap<String, String, CaseInsensitiveStringTraits> headers;
headers.set("meta", response->meta());
@ -76,9 +76,9 @@ GeminiDownload::~GeminiDownload()
m_job->shutdown();
}
NonnullOwnPtr<GeminiDownload> GeminiDownload::create_with_job(Badge<GeminiProtocol>, ClientConnection& client, NonnullRefPtr<Gemini::GeminiJob> job)
NonnullOwnPtr<GeminiDownload> GeminiDownload::create_with_job(Badge<GeminiProtocol>, ClientConnection& client, NonnullRefPtr<Gemini::GeminiJob> job, NonnullOwnPtr<OutputFileStream>&& output_stream)
{
return adopt_own(*new GeminiDownload(client, move(job)));
return adopt_own(*new GeminiDownload(client, move(job), move(output_stream)));
}
}