Fix protoc-gen-go schema variable case handling (#808)

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This fixes the handling of various casing when generating the service
methods variable.

Fixes #807

Signed-off-by: Edward McFarlane <[email protected]>

cmd/protoc-gen-connect-go/main.go

@@ -259,7 +259,7 @@ func generateServiceMethodsVar(g *protogen.GeneratedFile, file *protogen.File, s
 	if len(service.Methods) == 0 {
 		return
 	}
-	serviceMethodsName := unexport(fmt.Sprintf("%sMethods", service.Desc.Name()))
+	serviceMethodsName := serviceVarMethodsName(service)
 	g.P(serviceMethodsName, ` := `,
 		g.QualifiedGoIdent(file.GoDescriptorIdent),
 		`.Services().ByName("`, service.Desc.Name(), `").Methods()`)
@@ -558,8 +558,12 @@ func procedureHandlerName(m *protogen.Method) string {
 	return fmt.Sprintf("%s%sHandler", unexport(m.Parent.GoName), m.GoName)
 }
 
+func serviceVarMethodsName(m *protogen.Service) string {
+	return unexport(fmt.Sprintf("%sMethods", m.GoName))
+}
+
 func procedureVarMethodDescriptor(m *protogen.Method) string {
-	serviceMethodsName := unexport(fmt.Sprintf("%sMethods", m.Parent.GoName))
+	serviceMethodsName := serviceVarMethodsName(m.Parent)
 	return serviceMethodsName + `.ByName("` + string(m.Desc.Name()) + `")`
 }
 

cmd/protoc-gen-connect-go/main_test.go

@@ -42,6 +42,7 @@ import (
 	"connectrpc.com/connect/cmd/protoc-gen-connect-go/testdata/diffpackage/diffpackagediff"
 	"connectrpc.com/connect/cmd/protoc-gen-connect-go/testdata/noservice"
 	"connectrpc.com/connect/cmd/protoc-gen-connect-go/testdata/samepackage"
+	_ "connectrpc.com/connect/cmd/protoc-gen-connect-go/testdata/v1beta1service"
 )
 
 //go:embed testdata

cmd/protoc-gen-connect-go/testdata/v1beta1service/buf.gen.yaml

@@ -0,0 +1,15 @@
+version: v2
+managed:
+  enabled: true
+  override:
+    - file_option: go_package_prefix
+      value: connectrpc.com/connect/cmd/protoc-gen-connect-go/testdata/v1beta1service
+plugins:
+  - local: protoc-gen-go
+    out: .
+    opt: paths=source_relative
+  - local: protoc-gen-connect-go
+    out: .
+    opt:
+      - paths=source_relative
+      - package_suffix

cmd/protoc-gen-connect-go/testdata/v1beta1service/v1beta1service.proto

@@ -0,0 +1,26 @@
+// Copyright 2021-2024 The Connect Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file tests varying casing of the service name and method name.
+syntax = "proto3";
+
+package example;
+
+message GetExample_Request {}
+
+message Get1example_response {}
+
+service ExampleV1beta {
+  rpc Method(GetExample_Request) returns (Get1example_response) {}
+}