3dfb02eb14
This patch allows to wait for certain state when applying particular resources. Change-Id: I064cb49c8971f1edee870bc6c3c3dd1e428c73f0 Signed-off-by: Ruslan Aliev <raliev@mirantis.com> Closes: #624
62 lines
1.7 KiB
Go
Executable File
62 lines
1.7 KiB
Go
Executable File
/*
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package poller
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import (
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"fmt"
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"k8s.io/client-go/util/jsonpath"
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)
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// An Expression is used to find information about a kubernetes resource. It
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// evaluates to a boolean when matched against a resource.
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type Expression struct {
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// A Condition describes a JSONPath filter which is matched against an
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// array containing a single resource.
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Condition string
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Value string
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// jsonPath is used for the actual act of filtering on resources. It is
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// stored within the Expression as a means of memoization.
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jsonPath *jsonpath.JSONPath
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}
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// Match returns true if the given object matches the parsed jsonpath object.
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// An error is returned if the Expression's condition is not a valid JSONPath
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// as defined here: https://goessner.net/articles/JsonPath.
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func (e *Expression) Match(obj map[string]interface{}) (bool, error) {
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// Parse lazily
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if e.jsonPath == nil {
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jp := jsonpath.New("status-check")
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err := jp.Parse(e.Condition)
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if err != nil {
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return false, err
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}
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e.jsonPath = jp
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}
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results, err := e.jsonPath.FindResults(obj)
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if err != nil {
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return false, err
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}
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if e.Value != "" {
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return len(results[0]) == 1 && fmt.Sprintf("%s", results[0][0].Interface()) == e.Value, nil
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}
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return len(results[0]) == 1, nil
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}
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