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/*
* Copyright 2022 gRPC authors.
*
* 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 orca implements Open Request Cost Aggregation, which is an open
// standard for request cost aggregation and reporting by backends and the
// corresponding aggregation of such reports by L7 load balancers (such as
// Envoy) on the data plane. In a proxyless world with gRPC enabled
// applications, aggregation of such reports will be done by the gRPC client.
//
// # Experimental
//
// Notice: All APIs is this package are EXPERIMENTAL and may be changed or
// removed in a later release.
package orca
import (
"google.golang.org/grpc/grpclog"
"google.golang.org/grpc/internal/balancerload"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/orca/internal"
)
var logger = grpclog.Component("orca-backend-metrics")
// loadParser implements the Parser interface defined in `internal/balancerload`
// package. This interface is used by the client stream to parse load reports
// sent by the server in trailer metadata. The parsed loads are then sent to
// balancers via balancer.DoneInfo.
//
// The grpc package cannot directly call toLoadReport() as that would cause an
// import cycle. Hence this roundabout method is used.
type loadParser struct{}
func (loadParser) Parse(md metadata.MD) interface{} {
lr, err := internal.ToLoadReport(md)
if err != nil {
logger.Infof("Parse failed: %v", err)
}
if lr == nil && logger.V(2) {
logger.Infof("Missing ORCA load report data")
}
return lr
}
func init() {
balancerload.SetParser(loadParser{})
}
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