Fix Python

Author: david-perez

codegen-server/python/src/main/kotlin/software/amazon/smithy/rust/codegen/server/python/smithy/PythonServerCodegenVisitor.kt

@@ -132,7 +132,7 @@ class PythonServerCodegenVisitor(
      */
     override fun stringShape(shape: StringShape) {
         fun pythonServerEnumGeneratorFactory(codegenContext: ServerCodegenContext, writer: RustWriter, shape: StringShape) =
-            PythonServerEnumGenerator(codegenContext, writer, shape)
+            PythonServerEnumGenerator(codegenContext, writer, shape, validationExceptionConversionGenerator)
         stringShape(shape, ::pythonServerEnumGeneratorFactory)
     }
 

codegen-server/python/src/main/kotlin/software/amazon/smithy/rust/codegen/server/python/smithy/generators/PythonServerEnumGenerator.kt

@@ -17,6 +17,7 @@ import software.amazon.smithy.rust.codegen.core.util.dq
 import software.amazon.smithy.rust.codegen.server.python.smithy.PythonServerCargoDependency
 import software.amazon.smithy.rust.codegen.server.smithy.ServerCodegenContext
 import software.amazon.smithy.rust.codegen.server.smithy.generators.ServerEnumGenerator
+import software.amazon.smithy.rust.codegen.server.smithy.generators.ValidationExceptionConversionGenerator
 
 /**
  * To share enums defined in Rust with Python, `pyo3` provides the `PyClass` trait.
@@ -27,7 +28,8 @@ class PythonServerEnumGenerator(
     codegenContext: ServerCodegenContext,
     private val writer: RustWriter,
     shape: StringShape,
-) : ServerEnumGenerator(codegenContext, writer, shape) {
+    validationExceptionConversionGenerator: ValidationExceptionConversionGenerator,
+) : ServerEnumGenerator(codegenContext, writer, shape, validationExceptionConversionGenerator) {
 
     private val pyO3 = PythonServerCargoDependency.PyO3.toType()
 

codegen-server/python/src/main/kotlin/software/amazon/smithy/rust/codegen/server/python/smithy/testutil/PythonServerTestHelpers.kt

@@ -13,7 +13,9 @@ import software.amazon.smithy.rust.codegen.core.testutil.generatePluginContext
 import software.amazon.smithy.rust.codegen.core.util.runCommand
 import software.amazon.smithy.rust.codegen.server.python.smithy.PythonServerCodegenVisitor
 import software.amazon.smithy.rust.codegen.server.python.smithy.customizations.DECORATORS
+import software.amazon.smithy.rust.codegen.server.smithy.customizations.CustomValidationExceptionWithReasonDecorator
 import software.amazon.smithy.rust.codegen.server.smithy.customizations.ServerRequiredCustomizations
+import software.amazon.smithy.rust.codegen.server.smithy.customizations.SmithyValidationExceptionDecorator
 import software.amazon.smithy.rust.codegen.server.smithy.customize.CombinedServerCodegenDecorator
 import java.io.File
 import java.nio.file.Path
@@ -25,10 +27,13 @@ fun generatePythonServerPluginContext(model: Model) =
     generatePluginContext(model, runtimeConfig = TestRuntimeConfig)
 
 fun executePythonServerCodegenVisitor(pluginCtx: PluginContext) {
-    val codegenDecorator: CombinedServerCodegenDecorator =
+    val codegenDecorator =
         CombinedServerCodegenDecorator.fromClasspath(
             pluginCtx,
-            CombinedServerCodegenDecorator(DECORATORS + ServerRequiredCustomizations()),
+            *DECORATORS,
+            ServerRequiredCustomizations(),
+            SmithyValidationExceptionDecorator(),
+            CustomValidationExceptionWithReasonDecorator(),
         )
     PythonServerCodegenVisitor(pluginCtx, codegenDecorator).execute()
 }

codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/ServerCodegenVisitor.kt

@@ -103,7 +103,7 @@ open class ServerCodegenVisitor(
     protected var codegenContext: ServerCodegenContext
     protected var protocolGeneratorFactory: ProtocolGeneratorFactory<ServerProtocolGenerator, ServerCodegenContext>
     protected var protocolGenerator: ServerProtocolGenerator
-    private var validationExceptionConversionGenerator: ValidationExceptionConversionGenerator
+    protected var validationExceptionConversionGenerator: ValidationExceptionConversionGenerator
 
     init {
         val symbolVisitorConfig =