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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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4
Libraries/LibProtocol/Client.h
View file

@ -44,7 +44,8 @@ public:
virtual void handshake() override;
bool is_supported_protocol(const String&);
RefPtr<Download> start_download(const String& method, const String& url, const HashMap<String, String>& request_headers = {}, const ByteBuffer& request_body = {});
template<typename RequestHashMapTraits = Traits<String>>
RefPtr<Download> start_download(const String& method, const String& url, const HashMap<String, String, RequestHashMapTraits>& request_headers = {}, ReadonlyBytes request_body = {});
bool stop_download(Badge<Download>, Download&);
bool set_certificate(Badge<Download>, Download&, String, String);
@ -55,6 +56,7 @@ private:
virtual void handle(const Messages::ProtocolClient::DownloadProgress&) override;
virtual void handle(const Messages::ProtocolClient::DownloadFinished&) override;
virtual OwnPtr<Messages::ProtocolClient::CertificateRequestedResponse> handle(const Messages::ProtocolClient::CertificateRequested&) override;
virtual void handle(const Messages::ProtocolClient::HeadersBecameAvailable&) override;
HashMap<i32, RefPtr<Download>> m_downloads;
};