Support muxing gRPC broker connections over a single net.Conn #288
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fairclothjm
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Oct 23, 2023
swenson
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Oct 24, 2023
| @@ -0,0 +1,48 @@ | |||
| package grpcmux | |||
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Amusingly enough, this package doesn't seem to reference or use GRPC. :)
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Thanks! |
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wata727
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* Bump github.com/hashicorp/go-plugin from 1.4.10 to 1.6.0 Bumps [github.com/hashicorp/go-plugin](https://github.com/hashicorp/go-plugin) from 1.4.10 to 1.6.0. - [Release notes](https://github.com/hashicorp/go-plugin/releases) - [Changelog](https://github.com/hashicorp/go-plugin/blob/main/CHANGELOG.md) - [Commits](hashicorp/go-plugin@v1.4.10...v1.6.0) --- updated-dependencies: - dependency-name: github.com/hashicorp/go-plugin dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com> * Follow up of hashicorp/go-plugin#288 --------- Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: Kazuma Watanabe <watassbass@gmail.com>
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Implements multiplexing for the gRPC broker so that additional gRPC connections are multiplexed onto the plugin's initial listener instead of creating a new Unix or TCP listener for each gRPC stream ID. The primary motivation is the simplification this gives containerised plugins which will only have to negotiate creating a single Unix socket that can be used by both sides, instead of one on each side - in particular this will greatly ease supporting rootless container engines running containers with a non-root user.
This will require both sides of the connection to update their go-plugin version, and as such is strictly opt-in via client config.
The implementation uses the same yamux.Session-based multiplexing that netrpc uses. However, given that we don't have control over when the gRPC library might redial a new connection, we introduce the concept of knocking (essentially a handshake, somewhat similar to TCP's SYN-ACK handshake) to synchronise the client and server on establishing a connection for a pre-agreed stream ID.
I briefly explored implementing gRPC's
grpc.ClientConnInterfaceinstead to give us full control over when a new connection is established, which would get rid of the need for knocking/pre-agreeing an ID, but I got put off by having to implementgrpc.CallOptions, and also having to change the library's API, becauseGRPCBroker.Dialcurrently returns a concrete*grpc.ClientConnstruct. However, I'm still open to exploring that further if people think those problems are preferable to the ones this PR currently solves.