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util.go
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util.go
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// Copyright 2018 Istio Authors
//
// 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 config
import (
"fmt"
"strings"
)
// isFQN returns true if the name is fully qualified.
// every resource name is defined by Key.String()
// shortname.kind.namespace
func isFQN(name string) bool {
c := 0
for _, ch := range name {
if ch == '.' {
c++
}
if c > 2 {
return false
}
}
return c == 2
}
// canonicalize ensures that the name is fully qualified.
// NOTE: this multiple option return is temporary and will be removed after we delete / deprecated old style configs.
func canonicalize(name string, desiredKind, namespace string) (fqn string, alternate string) {
if isFQN(name) {
return name, ""
}
parts := strings.Split(name, ".")
if len(parts) == 1 {
return fmt.Sprintf("%s.%s.%s", name, desiredKind, namespace), ""
}
if len(parts) == 2 {
// this case is ambiguous between old config model and new; we don't know if 2nd part
// is the kind or the namespace. Let's return both the potential FQNs and let the caller match it against the
// desired lookup.
return fmt.Sprintf("%s.%s.%s", parts[0], parts[1], namespace),
fmt.Sprintf("%s.%s.%s", parts[0], desiredKind, parts[1])
}
return name, ""
}
// ExtractShortName extracts the 'name' portion of the FQN.
func ExtractShortName(name string) string {
if isFQN(name) {
return name[0:strings.Index(name, ".")]
}
return name
}