kubernetes client-go:将labelselector转换为标签字符串

问题描述

在kubernetes client-go API(或使用它的另一个库)中，是否有实用程序函数将k8s.io/apimachinery/pkg/apis/meta/v1/LabelSelector转换为字符串以填充k8s.io/apimachinery/pkg/apis/meta/v1/ListOptions中的字段LabelSelector?

In the kubernetes client-go API (or another library that uses it), is there a utility function to convert a k8s.io/apimachinery/pkg/apis/meta/v1/LabelSelector to a string to fill the field LabelSelector in k8s.io/apimachinery/pkg/apis/meta/v1/ListOptions?

我浏览了client-go的代码，但找不到类似的功能.

I digged through the code of client-go but I can't find a function like that.

LabelSelector.Marshall()或LabelSelector.String()都给了我(毫不奇怪，因为那不是他们的目的，但我还是尝试了).

The LabelSelector.Marshall() nor LabelSelector.String() give me that (unsurprisingly, because that's not their purpose, but I tried it anyway).

我有类似k8s.io/api/extensions/v1beta1/Deployment的规格说明，并想使用它的选择器标签集(即Selector字段)来使用

I have spec descriptions like k8s.io/api/extensions/v1beta1/Deployment, and want to use it's set of selector labels (i.e. the Selector field) to query it's pods using

options := metav1.ListOptions{
    LabelSelector: <stringified labels>,
}

podList, err := clientset.CoreV1().Pods(<namespace>).List(options)

推荐答案

您可以使用LabelSelectorAsMap(LabelSelector)函数将labelselector转换为map[string]string映射.

You can use LabelSelectorAsMap(LabelSelector) function to convert the labelselector into map[string]string map.

然后，使用软件包k8s.io/apimachinery/pkg/labels的SelectorFromSet函数将map转换为选择器/字符串.

Then, use SelectorFromSet function of package k8s.io/apimachinery/pkg/labels to convert map to selector/strings.

伪代码:

import (
    "k8s.io/apimachinery/pkg/labels"
    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

func ListPod(labelSelector metav1.LabelSelector) {

    labelMap := metav1.LabelSelectorAsMap(labelSelector)

    options := metav1.ListOptions{
        LabelSelector: labels.SelectorFromSet(labelMap).String(),
    }

    podList, err := clientset.CoreV1().Pods("<namespace>").List(options)

}

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