[client-gen] Support Read-Only APIs

This commit adds support for read-only APIs to client-gen.
If the tag `// +readonly=true` is used, only the {Get,List,Watch}
client methods will be generated.

cmd/libs/go2idl/client-gen/generators/fake/generator_fake_for_type.go

@@ -149,6 +149,8 @@ func (g *genFakeForType) GenerateType(c *generator.Context, t *types.Type, w io.
 
 	noMethods := extractBoolTagOrDie("noMethods", t.SecondClosestCommentLines) == true
 
+	readonly := extractBoolTagOrDie("readonly", t.SecondClosestCommentLines) == true
+
 	if namespaced {
 		sw.Do(structNamespaced, m)
 	} else {
@@ -158,6 +160,9 @@ func (g *genFakeForType) GenerateType(c *generator.Context, t *types.Type, w io.
 	if !noMethods {
 		sw.Do(resource, m)
 		sw.Do(kind, m)
+	}
+
+	if !noMethods && !readonly {
 		sw.Do(createTemplate, m)
 		sw.Do(updateTemplate, m)
 		// Generate the UpdateStatus method if the type has a status
@@ -166,6 +171,9 @@ func (g *genFakeForType) GenerateType(c *generator.Context, t *types.Type, w io.
 		}
 		sw.Do(deleteTemplate, m)
 		sw.Do(deleteCollectionTemplate, m)
+	}
+
+	if !noMethods {
 		sw.Do(getTemplate, m)
 		if hasObjectMeta(t) {
 			sw.Do(listUsingOptionsTemplate, m)
@@ -173,6 +181,9 @@ func (g *genFakeForType) GenerateType(c *generator.Context, t *types.Type, w io.
 			sw.Do(listTemplate, m)
 		}
 		sw.Do(watchTemplate, m)
+	}
+
+	if !noMethods && !readonly {
 		sw.Do(patchTemplate, m)
 	}
 

cmd/libs/go2idl/client-gen/generators/generator_for_type.go

@@ -102,14 +102,20 @@ func (g *genClientForType) GenerateType(c *generator.Context, t *types.Type, w i
 	}
 	noMethods := extractBoolTagOrDie("noMethods", t.SecondClosestCommentLines) == true
 
+	readonly := extractBoolTagOrDie("readonly", t.SecondClosestCommentLines) == true
+
 	sw.Do(interfaceTemplate1, m)
 	if !noMethods {
-		sw.Do(interfaceTemplate2, m)
+		if readonly {
-		// Include the UpdateStatus method if the type has a status
+			sw.Do(interfaceTemplateReadonly, m)
-		if genStatus(t) {
+		} else {
-			sw.Do(interfaceUpdateStatusTemplate, m)
+			sw.Do(interfaceTemplate2, m)
+			// Include the UpdateStatus method if the type has a status
+			if genStatus(t) {
+				sw.Do(interfaceUpdateStatusTemplate, m)
+			}
+			sw.Do(interfaceTemplate3, m)
 		}
-		sw.Do(interfaceTemplate3, m)
 	}
 	sw.Do(interfaceTemplate4, m)
 
@@ -121,7 +127,7 @@ func (g *genClientForType) GenerateType(c *generator.Context, t *types.Type, w i
 		sw.Do(newStructNonNamespaced, m)
 	}
 
-	if !noMethods {
+	if !noMethods && !readonly {
 		sw.Do(createTemplate, m)
 		sw.Do(updateTemplate, m)
 		// Generate the UpdateStatus method if the type has a status
@@ -130,9 +136,15 @@ func (g *genClientForType) GenerateType(c *generator.Context, t *types.Type, w i
 		}
 		sw.Do(deleteTemplate, m)
 		sw.Do(deleteCollectionTemplate, m)
+	}
+
+	if !noMethods {
 		sw.Do(getTemplate, m)
 		sw.Do(listTemplate, m)
 		sw.Do(watchTemplate, m)
+	}
+
+	if !noMethods && !readonly {
 		sw.Do(patchTemplate, m)
 	}
 
@@ -177,6 +189,11 @@ var interfaceTemplate3 = `
 	Watch(opts $.ListOptions|raw$) ($.watchInterface|raw$, error)
 	Patch(name string, pt $.PatchType|raw$, data []byte, subresources ...string) (result *$.type|raw$, err error)`
 
+var interfaceTemplateReadonly = `
+	Get(name string, options $.GetOptions|raw$) (*$.type|raw$, error)
+	List(opts $.ListOptions|raw$) (*$.type|raw$List, error)
+	Watch(opts $.ListOptions|raw$) ($.watchInterface|raw$, error)`
+
 var interfaceTemplate4 = `
 	$.type|public$Expansion
 }