feat(stackable-versioned): Generate downgrade From impls

crates/stackable-versioned-macros/src/attrs/k8s.rs

@@ -22,27 +22,30 @@ use syn::Path;
 ///   times.
 /// - `skip`: Controls skipping parts of the generation.
 #[derive(Clone, Debug, FromMeta)]
-pub(crate) struct KubernetesArguments {
-    pub(crate) group: String,
-    pub(crate) kind: Option<String>,
-    pub(crate) singular: Option<String>,
-    pub(crate) plural: Option<String>,
-    pub(crate) namespaced: Flag,
+pub struct KubernetesArguments {
+    pub group: String,
+    pub kind: Option<String>,
+    pub singular: Option<String>,
+    pub plural: Option<String>,
+    pub namespaced: Flag,
     // root
-    pub(crate) crates: Option<KubernetesCrateArguments>,
-    pub(crate) status: Option<Path>,
+    pub crates: Option<KubernetesCrateArguments>,
+    pub status: Option<Path>,
     // derive
     // schema
     // scale
     // printcolumn
     #[darling(multiple, rename = "shortname")]
-    pub(crate) shortnames: Vec<String>,
+    pub shortnames: Vec<String>,
     // category
     // selectable
     // doc
     // annotation
     // label
-    pub(crate) skip: Option<KubernetesSkipArguments>,
+    pub skip: Option<KubernetesSkipArguments>,
+
+    #[darling(default)]
+    pub options: RawKubernetesOptions,
 }
 
 /// This struct contains supported kubernetes skip arguments.
@@ -52,15 +55,15 @@ pub(crate) struct KubernetesArguments {
 /// - `merged_crd` flag, which skips generating the `crd()` and `merged_crd()` functions are
 ///    generated.
 #[derive(Clone, Debug, FromMeta)]
-pub(crate) struct KubernetesSkipArguments {
+pub struct KubernetesSkipArguments {
     /// Whether the `crd()` and `merged_crd()` generation should be skipped for
     /// this container.
-    pub(crate) merged_crd: Flag,
+    pub merged_crd: Flag,
 }
 
 /// This struct contains crate overrides to be passed to `#[kube]`.
 #[derive(Clone, Debug, FromMeta)]
-pub(crate) struct KubernetesCrateArguments {
+pub struct KubernetesCrateArguments {
     pub kube_core: Option<Path>,
     pub kube_client: Option<Path>,
     pub k8s_openapi: Option<Path>,
@@ -69,3 +72,8 @@ pub(crate) struct KubernetesCrateArguments {
     pub serde_json: Option<Path>,
     pub versioned: Option<Path>,
 }
+
+#[derive(Clone, Default, Debug, FromMeta)]
+pub struct RawKubernetesOptions {
+    pub experimental_conversion_tracking: Flag,
+}

crates/stackable-versioned-macros/src/codegen/container/mod.rs

@@ -8,7 +8,7 @@ use syn::{Attribute, Ident, ItemEnum, ItemStruct, Path, Visibility, parse_quote}
 use crate::{
     attrs::{
         container::StandaloneContainerAttributes,
-        k8s::{KubernetesArguments, KubernetesCrateArguments},
+        k8s::{KubernetesArguments, KubernetesCrateArguments, RawKubernetesOptions},
     },
     codegen::{
         VersionDefinition,
@@ -44,13 +44,9 @@ pub enum Container {
 
 impl Container {
     /// Generates the container definition for the specified `version`.
-    pub(crate) fn generate_definition(
-        &self,
-        version: &VersionDefinition,
-        multiple_versions: bool,
-    ) -> TokenStream {
+    pub(crate) fn generate_definition(&self, version: &VersionDefinition) -> TokenStream {
         match self {
-            Container::Struct(s) => s.generate_definition(version, multiple_versions),
+            Container::Struct(s) => s.generate_definition(version),
             Container::Enum(e) => e.generate_definition(version),
         }
     }
@@ -206,12 +202,9 @@ impl StandaloneContainer {
         let mut kubernetes_enum_variant_strings = Vec::new();
 
         let mut versions = self.versions.iter().peekable();
-        let multiple_versions = versions.len() > 1;
 
         while let Some(version) = versions.next() {
-            let container_definition = self
-                .container
-                .generate_definition(version, multiple_versions);
+            let container_definition = self.container.generate_definition(version);
 
             // NOTE (@Techassi): Using '.copied()' here does not copy or clone the data, but instead
             // removes one level of indirection of the double reference '&&'.
@@ -266,9 +259,7 @@ impl StandaloneContainer {
             false,
         ));
 
-        if multiple_versions {
-            tokens.extend(self.container.generate_kubernetes_status_struct());
-        }
+        tokens.extend(self.container.generate_kubernetes_status_struct());
 
         tokens
     }
@@ -314,6 +305,8 @@ pub struct ContainerOptions {
     pub skip_from: bool,
 }
 
+// TODO (@Techassi): Get rid of this whole mess. There should be an elegant way of using the
+// attributes directly (with all defaults set and validation done).
 #[derive(Debug)]
 pub struct KubernetesOptions {
     pub group: String,
@@ -335,6 +328,7 @@ pub struct KubernetesOptions {
     // annotation
     // label
     pub skip_merged_crd: bool,
+    pub config_options: KubernetesConfigOptions,
 }
 
 impl From<KubernetesArguments> for KubernetesOptions {
@@ -351,6 +345,7 @@ impl From<KubernetesArguments> for KubernetesOptions {
             status: args.status,
             shortnames: args.shortnames,
             skip_merged_crd: args.skip.is_some_and(|s| s.merged_crd.is_present()),
+            config_options: args.options.into(),
         }
     }
 }
@@ -473,3 +468,16 @@ impl<T> Deref for Override<T> {
         }
     }
 }
+
+#[derive(Debug)]
+pub struct KubernetesConfigOptions {
+    experimental_conversion_tracking: bool,
+}
+
+impl From<RawKubernetesOptions> for KubernetesConfigOptions {
+    fn from(options: RawKubernetesOptions) -> Self {
+        Self {
+            experimental_conversion_tracking: options.experimental_conversion_tracking.is_present(),
+        }
+    }
+}

crates/stackable-versioned-macros/src/codegen/container/struct.rs

@@ -134,11 +134,7 @@ pub struct Struct {
 // Common token generation
 impl Struct {
     /// Generates code for the struct definition.
-    pub fn generate_definition(
-        &self,
-        version: &VersionDefinition,
-        multiple_versions: bool,
-    ) -> TokenStream {
+    pub fn generate_definition(&self, version: &VersionDefinition) -> TokenStream {
         let where_clause = self.generics.where_clause.as_ref();
         let type_generics = &self.generics;
 
@@ -152,7 +148,7 @@ impl Struct {
         }
 
         // This only returns Some, if K8s features are enabled
-        let kube_attribute = self.generate_kube_attribute(version, multiple_versions);
+        let kube_attribute = self.generate_kube_attribute(version);
 
         quote! {
             #(#[doc = #version_docs])*
@@ -323,11 +319,7 @@ impl Struct {
 // makes keeping track of interconnected parts easier.
 // Kubernetes-specific token generation
 impl Struct {
-    pub fn generate_kube_attribute(
-        &self,
-        version: &VersionDefinition,
-        _multiple_versions: bool,
-    ) -> Option<TokenStream> {
+    pub fn generate_kube_attribute(&self, version: &VersionDefinition) -> Option<TokenStream> {
         let kubernetes_options = self.common.options.kubernetes_options.as_ref()?;
 
         // Required arguments
@@ -356,24 +348,16 @@ impl Struct {
             .then_some(quote! { , namespaced });
         let crates = kubernetes_options.crates.to_token_stream();
 
-        // TODO (@Techassi): Comment back in, once we are happy with the status struct
-        // let status = if multiple_versions {
-        //     let status_ident = format_ident!(
-        //         "{struct_ident}Status",
-        //         struct_ident = self.common.idents.kubernetes.as_ident()
-        //     );
-        //     Some(quote! { , status = #status_ident })
-        // } else {
-        //     kubernetes_options
-        //         .status
-        //         .as_ref()
-        //         .map(|s| quote! { , status = #s })
-        // };
-
         let status = kubernetes_options
-            .status
-            .as_ref()
-            .map(|s| quote! { , status = #s });
+            .config_options
+            .experimental_conversion_tracking
+            .then(|| {
+                let status_ident = format_ident!(
+                    "{struct_ident}Status",
+                    struct_ident = self.common.idents.kubernetes.as_ident()
+                );
+                quote! { , status = #status_ident }
+            });
 
         let shortnames: TokenStream = kubernetes_options
             .shortnames
@@ -473,36 +457,42 @@ impl Struct {
     pub fn generate_kubernetes_status_struct(&self) -> Option<TokenStream> {
         let kubernetes_options = self.common.options.kubernetes_options.as_ref()?;
 
-        let status_ident = format_ident!(
-            "{struct_ident}Status",
-            struct_ident = self.common.idents.kubernetes.as_ident()
-        );
-
-        let versioned_crate = &*kubernetes_options.crates.versioned;
-        let schemars_crate = &*kubernetes_options.crates.schemars;
-        let serde_crate = &*kubernetes_options.crates.serde;
-
-        let status = kubernetes_options.status.as_ref().map(|status| {
-            quote! {
-                #[serde(flatten)]
-                pub status: #status,
-            }
-        });
-
-        Some(quote! {
-            #[derive(
-                ::core::clone::Clone,
-                ::core::fmt::Debug,
-                #serde_crate::Deserialize,
-                #serde_crate::Serialize,
-                #schemars_crate::JsonSchema
-            )]
-            #[serde(rename_all = "camelCase")]
-            pub struct #status_ident {
-                pub changed_values: #versioned_crate::ChangedValues,
-
-                #status
-            }
-        })
+        kubernetes_options
+            .config_options
+            .experimental_conversion_tracking
+            .then(|| {
+                let status_ident = format_ident!(
+                    "{struct_ident}Status",
+                    struct_ident = self.common.idents.kubernetes.as_ident()
+                );
+
+                let versioned_crate = &*kubernetes_options.crates.versioned;
+                let schemars_crate = &*kubernetes_options.crates.schemars;
+                let serde_crate = &*kubernetes_options.crates.serde;
+
+                // TODO (@Techassi): Validate that users don't specify the status we generate
+                let status = kubernetes_options.status.as_ref().map(|status| {
+                    quote! {
+                        #[serde(flatten)]
+                        pub status: #status,
+                    }
+                });
+
+                quote! {
+                    #[derive(
+                        ::core::clone::Clone,
+                        ::core::fmt::Debug,
+                        #serde_crate::Deserialize,
+                        #serde_crate::Serialize,
+                        #schemars_crate::JsonSchema
+                    )]
+                    #[serde(rename_all = "camelCase")]
+                    pub struct #status_ident {
+                        pub changed_values: #versioned_crate::ChangedValues,
+
+                        #status
+                    }
+                }
+            })
     }
 }

crates/stackable-versioned-macros/src/codegen/module.rs

@@ -149,7 +149,6 @@ impl Module {
 
         let mut kubernetes_container_items: HashMap<Ident, KubernetesItems> = HashMap::new();
         let mut versions = self.versions.iter().peekable();
-        let multiple_versions = self.versions.len() > 1;
 
         while let Some(version) = versions.next() {
             let next_version = versions.peek().copied();
@@ -159,8 +158,7 @@ impl Module {
             let version_ident = &version.ident;
 
             for container in &self.containers {
-                container_definitions
-                    .extend(container.generate_definition(version, multiple_versions));
+                container_definitions.extend(container.generate_definition(version));
 
                 if !self.skip_from {
                     from_impls.extend(container.generate_upgrade_from_impl(

crates/stackable-versioned-macros/tests/inputs/k8s/pass/conversion_tracking.rs

@@ -0,0 +1,33 @@
+use kube::CustomResource;
+use schemars::JsonSchema;
+use serde::{Deserialize, Serialize};
+use stackable_versioned::versioned;
+// ---
+#[versioned(
+    version(name = "v1alpha1"),
+    version(name = "v1beta1"),
+    version(name = "v1"),
+    k8s(
+        group = "stackable.tech",
+        status = MyStatus,
+        options(experimental_conversion_tracking),
+    )
+)]
+// ---
+#[derive(Clone, Debug, Deserialize, Serialize, JsonSchema, CustomResource)]
+pub(crate) struct FooSpec {
+    #[versioned(added(since = "v1beta1"), changed(since = "v1", from_name = "bah"))]
+    bar: usize,
+    baz: bool,
+}
+// ---
+fn main() {}
+
+#[derive(Clone, Debug, JsonSchema, Deserialize, Serialize)]
+pub struct MyStatus {
+    foo: String,
+}
+
+fn usize_to_u16(input: usize) -> u16 {
+    input.try_into().unwrap()
+}