Use maximum value for gRPC message size limit

tfprotov5/server/server.go

@@ -2,6 +2,7 @@ package tf5server
 
 import (
 	"context"
+	"math"
 	"sync"
 
 	"github.com/hashicorp/go-hclog"
@@ -10,6 +11,7 @@ import (
 	"github.com/hashicorp/terraform-plugin-go/tfprotov5/internal/fromproto"
 	"github.com/hashicorp/terraform-plugin-go/tfprotov5/internal/tfplugin5"
 	"github.com/hashicorp/terraform-plugin-go/tfprotov5/internal/toproto"
+	"google.golang.org/grpc"
 )
 
 // ServeOpt is an interface for defining options that can be passed to the
@@ -55,6 +57,12 @@ func WithGoPluginLogger(logger hclog.Logger) ServeOpt {
 	})
 }
 
+func MaxMsgGRPCServer(opts []grpc.ServerOption) *grpc.Server {
+	opts = append(opts, grpc.MaxSendMsgSize(math.MaxInt32))
+	opts = append(opts, grpc.MaxRecvMsgSize(math.MaxInt32))
+	return grpc.NewServer(opts...)
+}
+
 // Serve starts a tfprotov5.ProviderServer serving, ready for Terraform to
 // connect to it. The name passed in should be the fully qualified name that
 // users will enter in the source field of the required_providers block, like
@@ -83,7 +91,7 @@ func Serve(name string, serverFactory func() tfprotov5.ProviderServer, opts ...S
 				GRPCProvider: serverFactory,
 			},
 		},
-		GRPCServer: plugin.DefaultGRPCServer,
+		GRPCServer: MaxMsgGRPCServer,
 	}
 	if conf.logger != nil {
 		serveConfig.Logger = conf.logger