forked from djworth/appstats
/
cost.go
52 lines (42 loc) · 833 Bytes
/
cost.go
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package appstats
import (
"reflect"
"github.com/golang/protobuf/proto"
)
var cost = struct {
Read, Write, Small int64
}{
7, 10, 1,
}
// TODO: Implement read and small ops costs.
func getCost(p proto.Message) int64 {
v := reflect.ValueOf(p)
v = reflect.Indirect(v)
if v.Kind() != reflect.Struct {
return 0
}
return extractCost(v)
}
func extractCost(v reflect.Value) int64 {
v = v.FieldByName("Cost")
if v.Kind() != reflect.Ptr {
return 0
}
v = v.Elem()
if v.Kind() != reflect.Struct {
return 0
}
extract := func(name string) int64 {
w := v.FieldByName(name)
if w.Kind() != reflect.Ptr {
return 0
}
w = w.Elem()
switch w.Kind() {
case reflect.Int, reflect.Int32, reflect.Int64:
return w.Int()
}
return 0
}
return (extract("IndexWrites") + extract("EntityWrites")) * cost.Write
}