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|
package memlimit
import (
"fmt"
"os"
"reflect"
"strings"
)
const (
envAUTOMEMLIMIT_EXPERIMENT = "AUTOMEMLIMIT_EXPERIMENT"
)
// Experiments is a set of experiment flags.
// It is used to enable experimental features.
//
// You can set the flags by setting the environment variable AUTOMEMLIMIT_EXPERIMENT.
// The value of the environment variable is a comma-separated list of experiment names.
//
// The following experiment names are known:
//
// - none: disable all experiments
// - system: enable fallback to system memory limit
type Experiments struct {
// System enables fallback to system memory limit.
System bool
}
func parseExperiments() (Experiments, error) {
var exp Experiments
// Create a map of known experiment names.
names := make(map[string]func(bool))
rv := reflect.ValueOf(&exp).Elem()
rt := rv.Type()
for i := 0; i < rt.NumField(); i++ {
field := rv.Field(i)
names[strings.ToLower(rt.Field(i).Name)] = field.SetBool
}
// Parse names.
for _, f := range strings.Split(os.Getenv(envAUTOMEMLIMIT_EXPERIMENT), ",") {
if f == "" {
continue
}
if f == "none" {
exp = Experiments{}
continue
}
val := true
set, ok := names[f]
if !ok {
return Experiments{}, fmt.Errorf("unknown AUTOMEMLIMIT_EXPERIMENT %s", f)
}
set(val)
}
return exp, nil
}
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