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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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20
Services/ProtocolServer/HttpProtocol.cpp
View file

@ -28,6 +28,7 @@
#include <LibHTTP/HttpRequest.h>
#include <ProtocolServer/HttpDownload.h>
#include <ProtocolServer/HttpProtocol.h>
#include <fcntl.h>
namespace ProtocolServer {
@ -40,7 +41,7 @@ HttpProtocol::~HttpProtocol()
{
}
OwnPtr<Download> HttpProtocol::start_download(ClientConnection& client, const String& method, const URL& url, const HashMap<String, String>& headers, const ByteBuffer& request_body)
OwnPtr<Download> HttpProtocol::start_download(ClientConnection& client, const String& method, const URL& url, const HashMap<String, String>& headers, ReadonlyBytes body)
{
HTTP::HttpRequest request;
if (method.equals_ignoring_case("post"))
@ -49,9 +50,20 @@ OwnPtr<Download> HttpProtocol::start_download(ClientConnection& client, const St
request.set_method(HTTP::HttpRequest::Method::GET);
request.set_url(url);
request.set_headers(headers);
request.set_body(request_body);
auto job = HTTP::HttpJob::construct(request);
auto download = HttpDownload::create_with_job({}, client, (HTTP::HttpJob&)*job);
request.set_body(body);
int fd_pair[2] { 0 };
if (pipe(fd_pair) != 0) {
auto saved_errno = errno;
dbgln("Protocol: pipe() failed: {}", strerror(saved_errno));
return nullptr;
}
auto output_stream = make<OutputFileStream>(fd_pair[1]);
output_stream->make_unbuffered();
auto job = HTTP::HttpJob::construct(request, *output_stream);
auto download = HttpDownload::create_with_job({}, client, (HTTP::HttpJob&)*job, move(output_stream));
download->set_download_fd(fd_pair[0]);
job->start();
return download;
}