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constraints.go
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constraints.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 implements support for predicates on agent
// attributes.
// Constraints notably implement a MergeParent operation, to implement
// override behavior in child Roles.
package constraint
import (
"fmt"
"strings"
"github.com/AliceO2Group/Control/common/logger"
"github.com/sirupsen/logrus"
)
/* TODO:
type Operator func(attribute string, value string) bool
func Equals(attribute string, value string) bool {
}*/
var log = logger.New(logrus.StandardLogger(),"constraints")
type Constraint struct {
Attribute string `yaml:"attribute"`
Value string `yaml:"value"`
// TODO: unmarshal this ↓
Operator Operator
}
type Operator int8
const (
Equals Operator = 0
)
func (o Operator) String() string {
switch o {
case Equals:
return "EQUALS"
}
return ""
}
func (c *Constraint) String() string {
if c == nil {
return ""
}
return fmt.Sprintf("ATTR:'%s' %s '%s'", c.Attribute, c.Operator.String(), c.Value)
}
type Constraints []Constraint
func (cts Constraints) String() string {
if cts == nil {
return "[]"
}
strs := make([]string, len(cts))
for i, ct := range cts {
strs[i] = ct.String()
}
return fmt.Sprintf("[%s]", strings.Join(strs, "; "))
}
func (cts Constraints) MergeParent(parentConstraints Constraints) (merged Constraints) {
merged = make(Constraints, len(parentConstraints))
copy(merged, parentConstraints)
for _, ct := range cts {
updated := false
for j, pCt := range merged {
// If we find that both new and parent have a constraint for the same attribute,
// then the new one replaces the parent's constraint in the merged Constraints
if ct.Attribute == pCt.Attribute {
merged[j] = ct
updated = true
break
}
}
if !updated {
merged = append(merged, ct)
}
}
return
}