add supported compressions to error desc

rpc_util.go

@@ -34,6 +34,7 @@
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/encoding"
 	"google.golang.org/grpc/encoding/proto"
+	"google.golang.org/grpc/internal/grpcutil"
 	"google.golang.org/grpc/internal/transport"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/peer"
@@ -728,9 +729,9 @@
 		}
 		if !haveCompressor {
 			if isServer {
-				return status.Newf(codes.Unimplemented, "grpc: Decompressor is not installed for grpc-encoding %q", recvCompress)
+				return status.Newf(codes.Unimplemented, "grpc: Decompressor is not installed for grpc-encoding %q, supported compressions: %v", recvCompress, grpcutil.RegisteredCompressors())
 			} else {
-				return status.Newf(codes.Internal, "grpc: Decompressor is not installed for grpc-encoding %q", recvCompress)
+				return status.Newf(codes.Internal, "grpc: Decompressor is not installed for grpc-encoding %q, supported compressions: %v", recvCompress, grpcutil.RegisteredCompressors())
 			}
 		}
 	default:

server.go

@@ -1304,7 +1304,7 @@ func (s *Server) processUnaryRPC(ctx context.Context, t transport.ServerTranspor
 	} else if rc != "" && rc != encoding.Identity {
 		decomp = encoding.GetCompressor(rc)
 		if decomp == nil {
-			st := status.Newf(codes.Unimplemented, "grpc: Decompressor is not installed for grpc-encoding %q", rc)
+			st := status.Newf(codes.Unimplemented, "grpc: Decompressor is not installed for grpc-encoding %q, supported compressions: %v", rc, grpcutil.RegisteredCompressors())
 			t.WriteStatus(stream, st)
 			return st.Err()
 		}
@@ -1632,7 +1632,7 @@ func (s *Server) processStreamingRPC(ctx context.Context, t transport.ServerTran
 	} else if rc != "" && rc != encoding.Identity {
 		ss.decomp = encoding.GetCompressor(rc)
 		if ss.decomp == nil {
-			st := status.Newf(codes.Unimplemented, "grpc: Decompressor is not installed for grpc-encoding %q", rc)
+			st := status.Newf(codes.Unimplemented, "grpc: Decompressor is not installed for grpc-encoding %q, supported compressions: %v", rc, grpcutil.RegisteredCompressors())
 			t.WriteStatus(ss.s, st)
 			return st.Err()
 		}