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#![recursion_limit = "1024"] #![warn(rust_2018_idioms)] //! This crate contains custom derives related to the [`k8s-openapi`](https://crates.io/crates/k8s-openapi) crate. extern crate proc_macro; mod custom_resource_definition; trait CustomDerive: Sized { fn parse(input: syn::DeriveInput, tokens: proc_macro2::TokenStream) -> Result<Self, syn::Error>; fn emit(self) -> Result<proc_macro2::TokenStream, syn::Error>; } fn run_custom_derive<T>(input: proc_macro::TokenStream) -> proc_macro::TokenStream where T: CustomDerive { let input: proc_macro2::TokenStream = input.into(); let tokens = input.clone(); let token_stream = match syn::parse2(input).and_then(|input| <T as CustomDerive>::parse(input, tokens)).and_then(<T as CustomDerive>::emit) { Ok(token_stream) => token_stream, Err(err) => err.to_compile_error(), }; token_stream.into() } trait ResultExt<T> { fn spanning(self, spanned: impl quote::ToTokens) -> Result<T, syn::Error>; } impl<T, E> ResultExt<T> for Result<T, E> where E: std::fmt::Display { fn spanning(self, spanned: impl quote::ToTokens) -> Result<T, syn::Error> { self.map_err(|err| syn::Error::new_spanned(spanned, err)) } } /// This custom derive can be used on a Kubernetes custom resource spec type to generate a custom resource definition object /// and associated API functions. /// /// # Example /// /// ```rust,ignore /// #[derive( /// Clone, Debug, PartialEq, /// k8s_openapi_derive::CustomResourceDefinition, /// serde_derive::Deserialize, serde_derive::Serialize, /// )] /// #[custom_resource_definition( /// group = "k8s-openapi-tests-custom-resource-definition.com", /// version = "v1", /// plural = "foobars", /// namespaced, /// )] /// struct FooBarSpec { /// prop1: String, /// prop2: Vec<bool>, /// #[serde(skip_serializing_if = "Option::is_none")] /// prop3: Option<i32>, /// } /// ``` /// /// Note: /// /// - The spec type must impl the following traits (either manually or via `#[derive]`): `Clone`, `Debug`, `PartialEq`, /// `serde_derive::Deserialize` and `serde_derive::Serialize` /// /// - The name of the spec type must end with `Spec`. This suffix is trimmed to generate the names of the other types. /// /// - The `k8s_openapi` crate must have been added as a dependency, since the macro expansion refers to types from it. /// /// The custom derive then generates a `FooBar` type that represents a custom resource corresponding to this definition: /// /// ```rust,ignore /// /// Custom resource for FooBarSpec /// #[derive(Clone, Debug, Default, PartialEq)] /// struct FooBar { /// metadata: Option<k8s_openapi::apimachinery::pkg::apis::meta::v1::ObjectMeta>, /// spec: Option<FooBarSpec>, /// } /// /// impl k8s_openapi::Resource for FooBar { ... } /// /// impl k8s_openapi::Metadata for FooBar { /// type Ty = k8s_openapi::apimachinery::pkg::apis::meta::v1::ObjectMeta; /// /// ... /// } /// /// impl<'de> serde_derive::Deserialize<'de> for FooBar { ... } /// /// impl serde_derive::Serialize for FooBar { ... } /// ``` /// /// The name of this type is automatically derived from the name of the spec type by truncating the `Spec` suffix. /// /// The `group` and `version` meta items of the `#[custom_resource_definition]` attribute of the macro are used to set /// the "group" and "API version" in the `k8s_openapi::Resource` impl respectively. The "kind" is automatically set to be the same as the resource type name, /// ie `"FooBar"` in this example. The `plural` meta item is used to construct the URLs of API operations for this custom resource. /// /// You would then register this custom resource definition with Kubernetes, with code like this: /// /// ```rust,ignore /// use k8s_openapi::apiextensions_apiserver::pkg::apis::apiextensions::v1beta1 as apiextensions; /// use k8s_openapi::apimachinery::pkg::apis::meta::v1 as meta; /// /// // Same as the `plurals` meta item in the `#[custom_resource_definition]` attribute /// let plural = "foobars"; /// /// let custom_resource_definition_spec = apiextensions::CustomResourceDefinitionSpec { /// group: <FooBar as k8s_openapi::Resource>::group().to_owned(), /// names: apiextensions::CustomResourceDefinitionNames { /// kind: <FooBar as k8s_openapi::Resource>::kind().to_owned(), /// plural: plural.to_owned(), /// short_names: Some(vec!["fb".to_owned()]), /// singular: Some("foobar".to_owned()), /// ..Default::default() /// }, /// scope: "Namespaced".to_owned(), /// version: <FooBar as k8s_openapi::Resource>::version().to_owned().into(), /// ..Default::default() /// }; /// /// let custom_resource_definition = apiextensions::CustomResourceDefinition { /// metadata: Some(meta::ObjectMeta { /// name: Some(format!("{}.{}", plural, <FooBar as k8s_openapi::Resource>::group())), /// ..Default::default() /// }), /// spec: custom_resource_definition_spec.into(), /// ..Default::default() /// }; /// /// let (request, response_body) = /// apiextensions::CustomResourceDefinition::create_custom_resource_definition(&custom_resource_definition, Default::default()) /// .expect("couldn't create custom resource definition"); /// let response = client.execute(request).expect("couldn't create custom resource definition"); /// ``` /// /// The macro also generates clientset functions associated with the custom resource type to create, get, update, etc. /// This is just like a regular Kubernetes resource type like `Pod`. /// /// ```rust,ignore /// impl FooBar { /// /// Create a FooBar /// fn create_namespaced_foo_bar( /// namespace: &str, /// body: &FooBar, /// ) -> Result<(http::Request<Vec<u8>>, fn(http::StatusCode) -> k8s_openapi::ResponseBody<CreateNamespacedFooBarResponse>), k8s_openapi::RequestError> { ... } /// /// /// Delete a FooBar /// fn delete_namespaced_foo_bar( /// name: &str, /// namespace: &str, /// optional: k8s_openapi::DeleteOptional<'_>, /// ) -> Result<(http::Request<Vec<u8>>, fn(http::StatusCode) -> k8s_openapi::ResponseBody<DeleteNamespacedFooBarResponse>), k8s_openapi::RequestError> { ... } /// /// /// Delete a collection of objects of kind FooBar /// fn delete_namespaced_foo_bar( /// namespace: &str, /// delete_optional: k8s_openapi::DeleteOptional<'_>, /// list_optional: k8s_openapi::ListOptional<'_>, /// ) -> Result<(http::Request<Vec<u8>>, fn(http::StatusCode) -> k8s_openapi::ResponseBody<DeleteNamespacedFooBarResponse>), k8s_openapi::RequestError> { ... } /// /// /// List objects of kind FooBar /// fn list_namespaced_foo_bar( /// namespace: &str, /// optional: k8s_openapi::ListOptional<'_>, /// ) -> Result<(http::Request<Vec<u8>>, fn(http::StatusCode) -> k8s_openapi::ResponseBody<ListNamespacedFooBarResponse>), k8s_openapi::RequestError> { ... } /// /// /// Partially update the specified FooBar /// fn patch_namespaced_foo_bar( /// name: &str, /// namespace: &str, /// body: &k8s_openapi::apimachinery::pkg::apis::meta::v1::Patch, /// optional: k8s_openapi::PatchOptional<'_>, /// ) -> Result<(http::Request<Vec<u8>>, fn(http::StatusCode) -> k8s_openapi::ResponseBody<PatchNamespacedFooBarResponse>), k8s_openapi::RequestError> { ... } /// /// /// Partially update the state of the specified FooBar /// fn patch_namespaced_foo_bar_status( /// name: &str, /// namespace: &str, /// body: &k8s_openapi::apimachinery::pkg::apis::meta::v1::Patch, /// optional: k8s_openapi::PatchOptional<'_>, /// ) -> Result<(http::Request<Vec<u8>>, fn(http::StatusCode) -> k8s_openapi::ResponseBody<PatchNamespacedFooBarStatusResponse>), k8s_openapi::RequestError> { ... } /// /// /// Read the specified FooBar /// fn read_namespaced_foo_bar( /// name: &str, /// namespace: &str, /// ) -> Result<(http::Request<Vec<u8>>, fn(http::StatusCode) -> k8s_openapi::ResponseBody<ReadNamespacedFooBarResponse>), k8s_openapi::RequestError> { ... } /// /// /// Read status of the specified FooBar /// fn read_namespaced_foo_bar_status( /// name: &str, /// namespace: &str, /// ) -> Result<(http::Request<Vec<u8>>, fn(http::StatusCode) -> k8s_openapi::ResponseBody<ReadNamespacedFooBarStatusResponse>), k8s_openapi::RequestError> { ... } /// /// /// Replace the specified FooBar /// fn replace_namespaced_foo_bar( /// name: &str, /// namespace: &str, /// body: &FooBar, /// ) -> Result<(http::Request<Vec<u8>>, fn(http::StatusCode) -> k8s_openapi::ResponseBody<ReplaceNamespacedFooBarResponse>), k8s_openapi::RequestError> { ... } /// /// /// Replace status of the specified FooBar /// fn replace_namespaced_foo_bar_status( /// name: &str, /// namespace: &str, /// body: &FooBar, /// ) -> Result<(http::Request<Vec<u8>>, fn(http::StatusCode) -> k8s_openapi::ResponseBody<ReplaceNamespacedFooBarStatusResponse>), k8s_openapi::RequestError> { ... } /// /// /// Watch objects of kind FooBar /// fn watch_namespaced_foo_bar( /// namespace: &str, /// optional: k8s_openapi::WatchOptional<'_>, /// ) -> Result<(http::Request<Vec<u8>>, fn(http::StatusCode) -> k8s_openapi::ResponseBody<WatchNamespacedFooBarResponse>), k8s_openapi::RequestError> { ... } /// } /// /// /// FooBarList is a list of FooBar /// #[derive(Clone, Debug, Default, PartialEq)] /// struct FooBarList { /// items: Vec<FooBarSpec>, /// metadata: Option<k8s_openapi::apimachinery::pkg::apis::meta::v1::ListMeta>, /// } /// /// impl k8s_openapi::Resource for FooBarList { ... } /// /// impl k8s_openapi::Metadata for FooBarList { /// type Ty = k8s_openapi::apimachinery::pkg::apis::meta::v1::ListMeta; /// /// ... /// } /// /// impl<'de> serde_derive::Deserialize<'de> for FooBarList { ... } /// /// impl serde_derive::Serialize for FooBarList { ... } /// ``` /// /// (You may wish to generate your own crate's docs, or run it through `cargo-expand`, to be able to see the macro expansion.) /// /// Refer to [the `k8s-openapi` crate docs](https://docs.rs/k8s-openapi) to learn more about how to use the return values of these functions. /// /// See the [`custom_resource_definition` test in the repository](https://github.com/Arnavion/k8s-openapi/blob/master/k8s-openapi-tests/src/custom_resource_definition.rs) /// for a full example of using this custom derive. #[proc_macro_derive(CustomResourceDefinition, attributes(custom_resource_definition))] pub fn derive_custom_resource_definition(input: proc_macro::TokenStream) -> proc_macro::TokenStream { run_custom_derive::<custom_resource_definition::CustomResourceDefinition>(input) }