Support gRPC-Web protocol

[jakobr-google]

See the gRPC-Web protocol document for details.

We should be able to support this by making a GrpcWebChannel that implements the ClientChannel interface.

Last time I looked at this package I was informed that it's designed for flutter.
But if scope has now expanded to support http 2 and http 1.1 then the improbable grpc-web library should be looked at. It's much easier and imho more useful than the official grpc-web that uses c++ and nginx. Anyway..

I don't use dart on the server, but instead golang.
But if you want to support http 1.1 with grpc dart go have a look.

I use http 1.1 and a VPN entire provide security where I can't tolerate domains. For example in on premise projects and where the endpoint on both ends is a dynamic IP. In those cases a private dht is used as a closed DNS to match up addresses up to organisations.
Why am I waiting on about this ? Well Https is great and we all want security but for b2b and iot and p2p http2 is a blocker.

See the improbable git repo for a grpc-web implementation that support normal grpc and grpc with browsers using websockets to give bi-directional streaming.
This version also adheres to the spec.
It also has great interceptor integration for logging, tracing and metric using Prometheus and is heavily production battle tested as they say.

It's golang, not dart based but much easier and flexible than the nginx and cpp way.

[jakobr-google]

No-one is talking about nginx or c++ here. This issue is for implementing the gRPC-Web protocol in Dart.

did not know :)

sounds good...

[sgon00]

Hi, any updates and plans on this requirement?

I plan to use grpc/http2 only (displacement of old http1 REST and websockets) in a new flutter project. For web interface, I plan to try angulardart v5 because it uses the same dart language. But after some research, I found out there were no native dart grpc-web support.

So far, I found out:

• The available gRPC servers that exposes services over gRPC-Web protocol to modern browsers:
  • nginx with gRPC-Web support built from https://github.com/grpc/grpc-web (private repo)
  • a standalone Go binary proxy
  • caddy server through grpc plugin which uses the above Go package
  • envoy through gRPC-Web http filter
• The available gRPC-Web clients
  • Javascript and Typescript
  • Vue.js
  • GopherJS
  • AngularDart is missing here!!!

To workaround it, I may try to use js_facade_gen tool to generate Dart code for the improbable typescript client. I am not sure if this will work or not.
I hope angulardart can have its own native gRPC-Web protocol support soon. Thanks a lot.

[jakobr-google]

Sounds like there's a lot of interest for this, so I've moved it up on my list of priorities. Absolutely no guarantees, but I expect to start looking at it around end of next week.

In the meantime, if anyone wants to pitch in, I'll happily take PRs for this!

[sgon00]

@jakobr-google Thank you very much for your quick reply and hard work. 👍

+1 Thats exactly what i am looking to us it for too. Flutter

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On Fri, 16 Mar 2018 at 09:48 sgon00 ***@***.***> wrote: @jakobr-google <https://github.com/jakobr-google> Thank you very much for your quick reply and hard work. 👍 — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#43 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ATuCwoYK5Q-aXlZqZzNaRLABlRu89lswks5te3xXgaJpZM4RITAe> .

[jakobr-google]

Just to make sure we're on the same page: Flutter is already supported. This issue is for adding support for web browsers, too.

Thanks. I should clarify then. The Client is Flutter and the Server is golang for me, so i have 2 requirements: - The GRPC golang code to produce Dart Client code that can be used inside Flutter - The GRPC golang code to produce Dart Cliet code that can be using inside Dart Web. - WHY ? because for some functionality i need to use a webview inside flutter and also just standard browser.

…

On Fri, 16 Mar 2018 at 11:29 Jakob Andersen ***@***.***> wrote: Just to make sure we're on the same page: Flutter is already supported. This issue is for adding support for web browsers, too. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#43 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ATuCwsE7XaoH341uMFsbxcbjJGtL6dqRks5te5QGgaJpZM4RITAe> .

[pcariel]

@jakobr-google this improvement will be compatible with Google Cloud Platform Endpoints ?

[jakobr-google]

@pcariel from what I can tell, for Cloud Endpoints, you configure a REST/JSON mapping that you can use from the browser, instead of talking gRPC. It doesn't look like they support gRPC-Web, AFAICT, so fixing this issue won't help with that, unfortunately.

For those following this issue, please keep in mind that

1. The gRPC protocol is based on HTTP/2, and as such does not currently work in browsers, since they don't expose HTTP/2 semantics.
2. The gRPC-Web protocol is not the same as gRPC. It requires you to run a proxy that will accept the gRPC-Web protocol calls from the browser, and translate them into real gRPC calls to the server. This gRPC-Web proxy will need to run somewhere (preferably on the same domain as the web app, so you don't have to deal with CORS). If you're really lucky, the gRPC server you're talking to might support gRPC-Web natively, in addition to gRPC.

This issue tracks adding support for a gRPC-Web client channel, as well as server support for gRPC-Web.

[leocavalcante]

I want to live in a world where your gRPC Dart server could serve your Flutter app and your AngularDart web-app without any hassle.