/
attributes.go
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/
attributes.go
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/*
* === This file is part of ALICE O² ===
*
* Copyright 2018 CERN and copyright holders of ALICE O².
* Author: Teo Mrnjavac <teo.mrnjavac@cern.ch>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* In applying this license CERN does not waive the privileges and
* immunities granted to it by virtue of its status as an
* Intergovernmental Organization or submit itself to any jurisdiction.
*/
package constraint
import (
"fmt"
"strings"
"github.com/mesos/mesos-go/api/v1/lib"
)
type Attributes []mesos.Attribute
func (attrs Attributes) String() string {
if attrs == nil {
return "[]"
}
strs := make([]string, len(attrs))
for i, attr := range attrs {
strs[i] = attr.String()
}
return fmt.Sprintf("[%s]", strings.Join(strs, "; "))
}
func (attrs Attributes) Get(attributeName string) (value string, ok bool) {
for _, a := range attrs {
if a.Name == attributeName {
value = a.GetText().GetValue()
ok = true
return
}
}
return
}
func (attrs Attributes) Satisfy(cts Constraints) (ok bool) {
if len(cts) == 0 {
ok = true
log.Debug("no constraints to satisfy, defaulting to true")
return
}
if attrs == nil {
log.Debug("no attributes but non-null constraints, defaulting to false")
return
}
for _, constraint := range cts {
log.WithField("constraint", constraint.String()).Debug("processing constraint")
switch constraint.Operator {
case Equals:
var value string
if value, ok = attrs.Get(constraint.Attribute); ok {
if value == constraint.Value {
ok = true
continue
} else {
ok = false
break
}
} else { //at least 1 constraint not satisfiable, bailing out
log.WithField("constraint", constraint.Attribute).Warning("at least 1 constraint not satisfiable (cannot get attribute)")
ok = false
break
}
default:
log.WithField("constraint", constraint.Attribute).Warning("unsupported operator, skipping constraint")
continue
}
}
return
}