| /* |
| * Copyright 2018-present Open Networking Foundation |
| |
| * 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 afrouter |
| |
| import ( |
| "fmt" |
| "github.com/golang/protobuf/proto" |
| "github.com/opencord/voltha-go/common/log" |
| "google.golang.org/grpc" |
| "sync" |
| ) |
| |
| func Codec() grpc.Codec { |
| return CodecWithParent(&protoCodec{}) |
| } |
| |
| func CodecWithParent(parent grpc.Codec) grpc.Codec { |
| return &transparentRoutingCodec{parent} |
| } |
| |
| type transparentRoutingCodec struct { |
| parentCodec grpc.Codec |
| } |
| |
| // sbFrame is a frame being "returned" to whomever established the connection |
| type sbFrame struct { |
| payload []byte |
| router Router |
| method string |
| backend *backend |
| mutex sync.Mutex |
| metaKey string |
| metaVal string |
| } |
| |
| // nbFrame is a frame coming in from whomever established the connection |
| type nbFrame struct { |
| payload []byte |
| router Router |
| backend *backend |
| err error |
| methodInfo methodDetails |
| serialNo uint64 |
| metaKey string |
| metaVal string |
| } |
| |
| func (cdc *transparentRoutingCodec) Marshal(v interface{}) ([]byte, error) { |
| switch t := v.(type) { |
| case *sbFrame: |
| return t.payload, nil |
| case *nbFrame: |
| return t.payload, nil |
| default: |
| return cdc.parentCodec.Marshal(v) |
| } |
| } |
| |
| func (cdc *transparentRoutingCodec) Unmarshal(data []byte, v interface{}) error { |
| switch t := v.(type) { |
| case *sbFrame: |
| t.payload = data |
| // This is where the affinity is established on a northbound response |
| t.router.ReplyHandler(v) |
| return nil |
| case *nbFrame: |
| t.payload = data |
| // This is were the afinity value is pulled from the payload |
| // and the backend selected. |
| t.backend = t.router.Route(v) |
| log.Debugf("Routing returned %v for method %s", t.backend, t.methodInfo.method) |
| return nil |
| default: |
| return cdc.parentCodec.Unmarshal(data, v) |
| } |
| } |
| |
| func (cdc *transparentRoutingCodec) String() string { |
| return fmt.Sprintf("%s", cdc.parentCodec.String()) |
| } |
| |
| // protoCodec is a Codec implementation with protobuf. It is the default Codec for gRPC. |
| type protoCodec struct{} |
| |
| func (protoCodec) Marshal(v interface{}) ([]byte, error) { |
| return proto.Marshal(v.(proto.Message)) |
| } |
| |
| func (protoCodec) Unmarshal(data []byte, v interface{}) error { |
| return proto.Unmarshal(data, v.(proto.Message)) |
| } |
| |
| func (protoCodec) String() string { |
| return "protoCodec" |
| } |