mirror of https://github.com/grpc/grpc-go.git
58 lines
1.9 KiB
Go
58 lines
1.9 KiB
Go
/*
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* Copyright 2022 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Package orca implements Open Request Cost Aggregation, which is an open
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// standard for request cost aggregation and reporting by backends and the
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// corresponding aggregation of such reports by L7 load balancers (such as
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// Envoy) on the data plane. In a proxyless world with gRPC enabled
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// applications, aggregation of such reports will be done by the gRPC client.
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//
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// # Experimental
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//
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// Notice: All APIs is this package are EXPERIMENTAL and may be changed or
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// removed in a later release.
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package orca
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import (
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"google.golang.org/grpc/grpclog"
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"google.golang.org/grpc/internal/balancerload"
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"google.golang.org/grpc/metadata"
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"google.golang.org/grpc/orca/internal"
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)
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var logger = grpclog.Component("orca-backend-metrics")
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// loadParser implements the Parser interface defined in `internal/balancerload`
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// package. This interface is used by the client stream to parse load reports
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// sent by the server in trailer metadata. The parsed loads are then sent to
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// balancers via balancer.DoneInfo.
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//
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// The grpc package cannot directly call toLoadReport() as that would cause an
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// import cycle. Hence this roundabout method is used.
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type loadParser struct{}
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func (loadParser) Parse(md metadata.MD) any {
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lr, err := internal.ToLoadReport(md)
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if err != nil {
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logger.Infof("Parse failed: %v", err)
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}
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return lr
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}
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func init() {
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balancerload.SetParser(loadParser{})
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}
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