Crate function_sdk_rust 

A Rust SDK for writing Crossplane composition functions.

Composition functions are gRPC servers implementing the FunctionRunnerService defined by Crossplane’s apiextensions.fn.proto.v1 API. This SDK provides the generated protocol types, a spec-compliant server runtime, and helpers for working with requests and responses.

The most important protocol rule: desired state is a fully specified server-side apply intent, not a merge patch. Build responses with response::to so the desired state and context accumulated by earlier pipeline steps are copied forward; anything left out is deleted from the cluster.

Re-exports

pub use server::Args;

pub use server::serve;

Modules

context

Well-known function context keys.

logging

Logging setup for composition functions.

proto

Generated protobuf, gRPC, and protojson (serde) code for the apiextensions.fn.proto.v1 FunctionRunnerService API.

request

Helpers for working with RunFunctionRequests.

resource

Helpers for working with composite and composed resources.

response

Helpers for working with RunFunctionResponses.

server

A spec-compliant gRPC server runtime for composition functions.

Enums

Error

Errors returned by the SDK.