| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| |
| /* |
| * |
| * Copyright 2019 gRPC authors. |
| * |
| */ |
| |
| // Package orca implements Open Request Cost Aggregation. |
| package orca |
| |
| import ( |
| orcapb "github.com/cncf/xds/go/xds/data/orca/v3" |
| |
| "github.com/dubbogo/gost/log/logger" |
| |
| "github.com/golang/protobuf/proto" |
| |
| "google.golang.org/grpc/metadata" |
| ) |
| |
| import ( |
| "dubbo.apache.org/dubbo-go/v3/xds/utils/balancerload" |
| ) |
| |
| const mdKey = "X-Endpoint-Load-Metrics-Bin" |
| |
| // toBytes converts a orca load report into bytes. |
| func toBytes(r *orcapb.OrcaLoadReport) []byte { |
| if r == nil { |
| return nil |
| } |
| |
| b, err := proto.Marshal(r) |
| if err != nil { |
| logger.Warnf("orca: failed to marshal load report: %v", err) |
| return nil |
| } |
| return b |
| } |
| |
| // ToMetadata converts a orca load report into grpc metadata. |
| func ToMetadata(r *orcapb.OrcaLoadReport) metadata.MD { |
| b := toBytes(r) |
| if b == nil { |
| return nil |
| } |
| return metadata.Pairs(mdKey, string(b)) |
| } |
| |
| // fromBytes reads load report bytes and converts it to orca. |
| func fromBytes(b []byte) *orcapb.OrcaLoadReport { |
| ret := new(orcapb.OrcaLoadReport) |
| if err := proto.Unmarshal(b, ret); err != nil { |
| logger.Warnf("orca: failed to unmarshal load report: %v", err) |
| return nil |
| } |
| return ret |
| } |
| |
| // FromMetadata reads load report from metadata and converts it to orca. |
| // |
| // It returns nil if report is not found in metadata. |
| func FromMetadata(md metadata.MD) *orcapb.OrcaLoadReport { |
| vs := md.Get(mdKey) |
| if len(vs) == 0 { |
| return nil |
| } |
| return fromBytes([]byte(vs[0])) |
| } |
| |
| type loadParser struct{} |
| |
| func (*loadParser) Parse(md metadata.MD) interface{} { |
| return FromMetadata(md) |
| } |
| |
| func init() { |
| balancerload.SetParser(&loadParser{}) |
| } |