KRPC-143 Repeated types in gRPC

[Mr3zee]

Subsystem
gRPC

Solution
Support for repeated types in the Protobuf plugin

[e5l]

nice, lgtm

[Copilot]

Pull Request Overview

This PR implements support for repeated types in the Protobuf plugin to extend gRPC functionality. Key changes include the addition of a new proto file (repeated.proto), updates to the gRPC service and corresponding tests, and modifications to the model and code generators to properly handle repeated fields.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
protobuf-plugin/src/test/proto/repeated.proto	Added a new message with repeated fields for testing
protobuf-plugin/src/test/proto/reference_service.proto	Updated service to include a new RPC for repeated types
protobuf-plugin/src/test/kotlin/kotlinx/rpc/protobuf/test/TestReferenceService.kt	Added test cases for the new repeated type functionality
protobuf-plugin/src/main/kotlin/kotlinx/rpc/protobuf/model/FieldDeclaration.kt	Modified the repeated field type representation
protobuf-plugin/src/main/kotlin/kotlinx/rpc/protobuf/ProtoToModelInterpreter.kt	Changed the wrapping logic for field type references
protobuf-plugin/src/main/kotlin/kotlinx/rpc/protobuf/ModelToKotlinGenerator.kt	Updated getter/setter generation and type casting for repeated fields

Comments suppressed due to low confidence (2)

protobuf-plugin/src/main/kotlin/kotlinx/rpc/protobuf/model/FieldDeclaration.kt:18

• [nitpick] Consider renaming the 'List' data class to avoid confusion with Kotlin's standard List type. A name like 'RepeatedField' might convey its purpose more clearly.

data class List(val value: FieldType) : FieldType {

protobuf-plugin/src/main/kotlin/kotlinx/rpc/protobuf/ModelToKotlinGenerator.kt:203

• [nitpick] Ensure that appending 'List' to the field name for repeated fields aligns with the expected accessor naming conventions in the generated code, as the tests refer to properties without the 'List' suffix.

val javaName = when (field.type) { is FieldType.List -> "${field.name}List" else -> field.name }

[Copilot]

[nitpick] Double-check that numeric list elements do not require any platform-specific casting. If new numeric types are added in the future, consider handling them explicitly.

Suggested change

	is FieldType.IntegralType -> ""
	is FieldType.IntegralType -> ".map { it }"