Module transcode 

REST→gRPC transcoding layer.

Reads google.api.http annotations from proto service descriptors and builds axum routes that proxy JSON/form requests to gRPC upstream. The upstream decides the HTTP answer beyond the JSON body where it needs to: its response metadata becomes response headers, x-http-code sets the status of a successful unary call, and google.api.HttpBody carries a raw body in either direction.

Generic: works with ANY proto descriptor set. No product-specific code.

Modules

body

Request body media type.

codec

Dynamic gRPC codec for prost-reflect::DynamicMessage.

error

gRPC → HTTP error mapping.

metadata

HTTP → gRPC metadata, trace-context, and deadline propagation.

request

Request message construction for REST→gRPC transcoding.

Structs

RpcSelection

The RPCs transcoded to REST: every one with a google.api.http rule, or only the services and methods named.

TranscodeOptions

How routes_with_options builds the transcoded routes.

Constants

UPSTREAM_DEADLINE

How long the upstream may take to answer a call with its response headers when the client’s grpc-timeout asks for no shorter deadline.

Traits

TranscodeState

Trait for state types that support REST→gRPC transcoding.

Functions

proto_path_to_axum

Convert a google.api.http path template to axum 0.8 path syntax.

route_paths

The axum paths routes_with_options would register for this pool, aliases and selection.

routes

Build transcoded REST→gRPC routes from a descriptor pool.

routes_with_options

routes, built as options describe.