/
picker.go
85 lines (74 loc) · 2.15 KB
/
picker.go
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/*
*
* Copyright 2020 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 lrs
import (
orcapb "github.com/cncf/udpa/go/udpa/data/orca/v1"
"google.golang.org/grpc/balancer"
)
const (
serverLoadCPUName = "cpu_utilization"
serverLoadMemoryName = "mem_utilization"
)
// loadReporter wraps the methods from the loadStore that are used here.
type loadReporter interface {
CallStarted(locality string)
CallFinished(locality string, err error)
CallServerLoad(locality, name string, val float64)
}
type loadReportPicker struct {
p balancer.Picker
locality string
loadStore loadReporter
}
func newLoadReportPicker(p balancer.Picker, id string, loadStore loadReporter) *loadReportPicker {
return &loadReportPicker{
p: p,
locality: id,
loadStore: loadStore,
}
}
func (lrp *loadReportPicker) Pick(info balancer.PickInfo) (balancer.PickResult, error) {
res, err := lrp.p.Pick(info)
if err != nil {
return res, err
}
if lrp.loadStore == nil {
return res, err
}
lrp.loadStore.CallStarted(lrp.locality)
oldDone := res.Done
res.Done = func(info balancer.DoneInfo) {
if oldDone != nil {
oldDone(info)
}
lrp.loadStore.CallFinished(lrp.locality, info.Err)
load, ok := info.ServerLoad.(*orcapb.OrcaLoadReport)
if !ok {
return
}
lrp.loadStore.CallServerLoad(lrp.locality, serverLoadCPUName, load.CpuUtilization)
lrp.loadStore.CallServerLoad(lrp.locality, serverLoadMemoryName, load.MemUtilization)
for n, d := range load.RequestCost {
lrp.loadStore.CallServerLoad(lrp.locality, n, d)
}
for n, d := range load.Utilization {
lrp.loadStore.CallServerLoad(lrp.locality, n, d)
}
}
return res, err
}