mesh: adding type aliases for mesh resource usage (#18448)

Introduces some simple type aliases for DecodedResource[*X] wrappers for each type which cut down on the verbosity

internal/mesh/internal/types/decoded.go

@@ -0,0 +1,20 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: BUSL-1.1
+
+package types
+
+import (
+	"github.com/hashicorp/consul/internal/resource"
+	pbcatalog "github.com/hashicorp/consul/proto-public/pbcatalog/v1alpha1"
+	pbmesh "github.com/hashicorp/consul/proto-public/pbmesh/v1alpha1"
+)
+
+type (
+	DecodedHTTPRoute         = resource.DecodedResource[*pbmesh.HTTPRoute]
+	DecodedGRPCRoute         = resource.DecodedResource[*pbmesh.GRPCRoute]
+	DecodedTCPRoute          = resource.DecodedResource[*pbmesh.TCPRoute]
+	DecodedDestinationPolicy = resource.DecodedResource[*pbmesh.DestinationPolicy]
+	DecodedComputedRoutes    = resource.DecodedResource[*pbmesh.ComputedRoutes]
+	DecodedFailoverPolicy    = resource.DecodedResource[*pbcatalog.FailoverPolicy]
+	DecodedService           = resource.DecodedResource[*pbcatalog.Service]
+)

internal/resource/decode.go

@@ -20,6 +20,23 @@ type DecodedResource[T proto.Message] struct {
 	Data     T
 }
 
+func (d *DecodedResource[T]) GetResource() *pbresource.Resource {
+	if d == nil {
+		return nil
+	}
+
+	return d.Resource
+}
+
+func (d *DecodedResource[T]) GetData() T {
+	if d == nil {
+		var zero T
+		return zero
+	}
+
+	return d.Data
+}
+
 // Decode will generically decode the provided resource into a 2-field
 // structure that holds onto the original Resource and the decoded contents.
 //