add psrpc middleware to suppress errors (#490)

psrpc/errors.go

@@ -0,0 +1,82 @@
+// Copyright 2023 LiveKit, Inc.
+//
+// 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.
+
+package psrpc
+
+import (
+	"context"
+	"errors"
+
+	"google.golang.org/protobuf/proto"
+
+	"github.com/livekit/psrpc"
+)
+
+func WithSuppressClientErrors(errs ...error) psrpc.ClientOption {
+	return psrpc.WithClientOptions(
+		psrpc.WithClientRPCInterceptors(newClientRPCErrorInterceptor(errs...)),
+		psrpc.WithClientMultiRPCInterceptors(newMultiRPCErorrInterceptor(errs...)),
+	)
+}
+
+func WithSuppressServerErrors(errs ...error) psrpc.ServerOption {
+	return psrpc.WithServerOptions(
+		psrpc.WithServerRPCInterceptors(newServerRPCErorrInterceptor(errs...)),
+	)
+}
+
+func suppressErrors(err error, ignored ...error) error {
+	if err != nil {
+		for _, e := range ignored {
+			if errors.Is(err, e) {
+				return nil
+			}
+		}
+	}
+	return err
+}
+
+func newClientRPCErrorInterceptor(errs ...error) psrpc.ClientRPCInterceptor {
+	return func(rpcInfo psrpc.RPCInfo, next psrpc.ClientRPCHandler) psrpc.ClientRPCHandler {
+		return func(ctx context.Context, req proto.Message, opts ...psrpc.RequestOption) (res proto.Message, err error) {
+			res, err = next(ctx, req, opts...)
+			return res, suppressErrors(err, errs...)
+		}
+	}
+}
+
+func newServerRPCErorrInterceptor(errs ...error) psrpc.ServerRPCInterceptor {
+	return func(ctx context.Context, req proto.Message, rpcInfo psrpc.RPCInfo, handler psrpc.ServerRPCHandler) (res proto.Message, err error) {
+		res, err = handler(ctx, req)
+		return res, suppressErrors(err, errs...)
+	}
+}
+
+func newMultiRPCErorrInterceptor(errs ...error) psrpc.ClientMultiRPCInterceptor {
+	return func(rpcInfo psrpc.RPCInfo, next psrpc.ClientMultiRPCHandler) psrpc.ClientMultiRPCHandler {
+		return &multiRPCErorrInterceptor{
+			ClientMultiRPCHandler: next,
+			errors:                errs,
+		}
+	}
+}
+
+type multiRPCErorrInterceptor struct {
+	psrpc.ClientMultiRPCHandler
+	errors []error
+}
+
+func (r *multiRPCErorrInterceptor) Recv(msg proto.Message, err error) {
+	r.ClientMultiRPCHandler.Recv(msg, suppressErrors(err, r.errors...))
+}