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decision.go
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decision.go
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// Copyright 2016-2017 Authors of Cilium
//
// 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package api
import (
"fmt"
)
// Decision is a reachability policy decision
type Decision byte
const (
// Undecided means that we have not come to a decision yet
Undecided Decision = iota
// Allowed means that reachability is allowed
Allowed
// Denied means that reachability is denied
Denied
)
var (
decisionToString = map[Decision]string{
Undecided: "undecided",
Allowed: "allowed",
Denied: "denied",
}
stringToDecision = map[string]Decision{
"undecided": Undecided,
"allowed": Allowed,
"denied": Denied,
}
)
// String returns the decision in human readable format
func (d Decision) String() string {
if v, exists := decisionToString[d]; exists {
return v
}
return ""
}
// UnmarshalJSON parses a JSON formatted buffer and returns a decision
func (d *Decision) UnmarshalJSON(b []byte) error {
if d == nil {
d = new(Decision)
}
if len(b) <= len(`""`) {
return fmt.Errorf("invalid decision '%s'", string(b))
}
if v, exists := stringToDecision[string(b[1:len(b)-1])]; exists {
*d = v
return nil
}
return fmt.Errorf("unknown '%s' decision", string(b))
}
// MarshalJSON returns the decision as JSON formatted buffer
func (d Decision) MarshalJSON() ([]byte, error) {
return []byte(fmt.Sprintf(`"%s"`, d)), nil
}