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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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6
Libraries/LibHTTP/HttpJob.h
View file

@ -38,8 +38,8 @@ namespace HTTP {
class HttpJob final : public Job {
C_OBJECT(HttpJob)
public:
explicit HttpJob(const HttpRequest& request)
: Job(request)
explicit HttpJob(const HttpRequest& request, OutputStream& output_stream)
: Job(request, output_stream)
{
}
@ -59,7 +59,7 @@ protected:
virtual bool can_read() const override;
virtual ByteBuffer receive(size_t) override;
virtual bool eof() const override;
virtual bool write(const ByteBuffer&) override;
virtual bool write(ReadonlyBytes) override;
virtual bool is_established() const override { return true; }
private: