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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| // Copyright 2021 PingCAP, Inc. | ||
| // | ||
| // 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, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package placement | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strings" | ||
| ) | ||
|
|
||
| // Constraints is a slice of constraints. | ||
| type Constraints []Constraint | ||
|
|
||
| // NewConstraints will check labels, and build Constraints for rule. | ||
| func NewConstraints(labels []string) (Constraints, error) { | ||
| constraints := make(Constraints, 0, len(labels)) | ||
| for _, str := range labels { | ||
| label, err := NewConstraint(strings.TrimSpace(str)) | ||
| if err != nil { | ||
| return constraints, err | ||
| } | ||
|
|
||
| err = constraints.Add(label) | ||
| if err != nil { | ||
| return constraints, err | ||
| } | ||
| } | ||
| return constraints, nil | ||
| } | ||
|
|
||
| // Restore converts label constraints to a string. | ||
| func (constraints *Constraints) Restore() (string, error) { | ||
| var sb strings.Builder | ||
| for i, constraint := range *constraints { | ||
| if i > 0 { | ||
| sb.WriteByte(',') | ||
| } | ||
| sb.WriteByte('"') | ||
| conStr, err := constraint.Restore() | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| sb.WriteString(conStr) | ||
| sb.WriteByte('"') | ||
| } | ||
| return sb.String(), nil | ||
| } | ||
|
|
||
| // Add will add a new label constraint, with validation of all constraints. | ||
| // Note that Add does not validate one single constraint. | ||
| func (constraints *Constraints) Add(label Constraint) error { | ||
| pass := true | ||
|
|
||
| for _, cnst := range *constraints { | ||
| res := label.CompatibleWith(&cnst) | ||
| if res == ConstraintCompatible { | ||
| continue | ||
| } | ||
| if res == ConstraintDuplicated { | ||
| pass = false | ||
| continue | ||
| } | ||
| s1, err := label.Restore() | ||
| if err != nil { | ||
| s1 = err.Error() | ||
| } | ||
| s2, err := cnst.Restore() | ||
| if err != nil { | ||
| s2 = err.Error() | ||
| } | ||
| return fmt.Errorf("%w: '%s' and '%s'", ErrConflictingConstraints, s1, s2) | ||
| } | ||
|
|
||
| if pass { | ||
| *constraints = append(*constraints, label) | ||
| } | ||
| return nil | ||
| } |
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