62 lines
1.7 KiB
Go
Executable File
62 lines
1.7 KiB
Go
Executable File
/*
|
|
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
|
|
|
|
https://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 poller
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"k8s.io/client-go/util/jsonpath"
|
|
)
|
|
|
|
// An Expression is used to find information about a kubernetes resource. It
|
|
// evaluates to a boolean when matched against a resource.
|
|
type Expression struct {
|
|
// A Condition describes a JSONPath filter which is matched against an
|
|
// array containing a single resource.
|
|
Condition string
|
|
Value string
|
|
|
|
// jsonPath is used for the actual act of filtering on resources. It is
|
|
// stored within the Expression as a means of memoization.
|
|
jsonPath *jsonpath.JSONPath
|
|
}
|
|
|
|
// Match returns true if the given object matches the parsed jsonpath object.
|
|
// An error is returned if the Expression's condition is not a valid JSONPath
|
|
// as defined here: https://goessner.net/articles/JsonPath.
|
|
func (e *Expression) Match(obj map[string]interface{}) (bool, error) {
|
|
// Parse lazily
|
|
if e.jsonPath == nil {
|
|
jp := jsonpath.New("status-check")
|
|
|
|
err := jp.Parse(e.Condition)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
e.jsonPath = jp
|
|
}
|
|
|
|
results, err := e.jsonPath.FindResults(obj)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
if e.Value != "" {
|
|
return len(results[0]) == 1 && fmt.Sprintf("%s", results[0][0].Interface()) == e.Value, nil
|
|
}
|
|
|
|
return len(results[0]) == 1, nil
|
|
}
|