Implement client to server streaming

[ydesgagn]

Hi,

I know client to server streaming is not supported but the other way is according to the readme.

Do you have any plan to add it? It would be really helpful for us as we have to file upload endpoint using streaming.

service FileService {
    // Upload a user submitted file
    rpc UploadFile (stream UploadFileRequest) returns (UploadFileResponse);
}

Thanks

[ydesgagn]

I would be willing to allocate 1-2 engineers on this to create a PR. Any guidelines we should follow so the PR can be accepted smoothly?

[wenbozhu]

What Web API do you plan to use to implement the client side support?

Fetch/stream doesn't yet support streamed upload. We will be doing some origin trial in chrome to decide if streamed upload will work reliably on Internet.

[mrmeku]

@wenbozhu As a strawman for a potential solution, would using a websocket between client and server be sufficient to implement this feature? To me that seems like the obvious solution, but if it has drawbacks I think it would be good to document them here to inform other potential solutions

[wenbozhu]

@mrmeku I added a section on the streaming-road-map doc.

===

Chrome origin trial for fetch/upload is still in progress. Will update this thread with the results.

[dunkymole]

Hey @wenbozhu. The trials seems to run to Jul 14, 2021, is this the earliest we can expect an update?

[wenbozhu]

We ran into some bugs (crashes) in chrome and the fix is out and next OT is in progress. Will provide an update soon.

[dunkymole]

Hi. Any update? :-)

[wenbozhu]

The chrome origin trial is still on-going, which revealed a few bugs and caused a few wide issues for google services (due to the code that enables Origin Trial).

[Blackclaws]

Would be interesting to know what the plan for streaming support is going forward. The roadmap docs are 2 years old by this point and there doesn't seem to be a lot of work in these areas.

[sampajano]

Please refer to #1205.
(Closing this issue since it's duplicate)

I will provide a roadmap update soon! Thanks!