Implement gRPC log stream

[jprochazk]

• Do not merge: Depends on Implement gRPC log sink #8709.
• Closes Implement gRPC log stream #8759

This PR implements Viewer-side log streaming from an in-memory storage node.

It is not currently possible to host the server either in the SDK or the viewer, so for now a separate binary exists in the re_grpc_server crate (cargo run -p re_grpc_server), that starts on localhost:1852.

Currently the URL prefix is temp://, which is a placeholder for the real URL prefix. The prefix is used by the Viewer to determine what kind of data source it is working with, so we need something that uniquely identifies the in-memory storage node. It has to be separate from existing gRPC infrastructure, because there is currently no overlap in functionality between the two.

[github-actions]

Web viewer built successfully. If applicable, you should also test it:

• I have tested the web viewer

Result	Commit	Link	Manifest
✅	858c844	https://rerun.io/viewer/pr/8730	+nightly +main

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[emilk]

I added this issue for removing the temp:// thing:

• Use the same grpc:// client for both Storage Node and re_grpc_server #8761

[emilk]

Have you tested this with the web viewer? pixi run rerun-web temp://…

[jprochazk]

Ok, I have this working on web now. Took much longer than expected, because I realised half-way that I need to use the envoy proxy. envoy doesn't seem to be available through pixi, so we'll have to install it manually for the time being: https://www.envoyproxy.io/docs/envoy/latest/start/install

1. envoy -c crates/store/re_grpc_server/envoy.yml
2. cargo run -p re_grpc_server --release
3. pixi run rerun-web-release and open http://localhost:9090/?url=temp://localhost:1853

4. import rerun as rr
   rr.init("rerun_example_text_log")
   rr.connect_grpc('http://127.0.0.1:1853')
   rr.log("log", rr.TextLog("Application started.", level=rr.TextLogLevel.INFO))

This greatly complicates the usual rerun-web setup... If we no longer support websockets, we'll always have to run the proxy. I'm going to try and look into if there's a way to do our own "proxying" in the same process as re_grpc_server, otherwise this is dead on arrival...

[jprochazk]

I checked dataplatform and looks like I just forgot to setup tonic-web... 🤦

1. cargo run -p re_grpc_server --release
2. pixi run rerun-web-release and open http://localhost:9090/?url=temp://localhost:1852

3. import rerun as rr
   rr.init("rerun_example_text_log")
   rr.connect_grpc('http://127.0.0.1:1853')
   rr.log("log", rr.TextLog("Application started.", level=rr.TextLogLevel.INFO))

[emilk]

Nice!