mirror of
https://github.com/TECHNOFAB11/zfs-localpv.git
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100 lines
3 KiB
Go
100 lines
3 KiB
Go
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/*
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Copyright 2020 The OpenEBS Authors
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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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http://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 v1alpha1
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import (
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"github.com/openebs/zfs-localpv/pkg/common/env"
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"github.com/pkg/errors"
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"k8s.io/client-go/rest"
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"k8s.io/client-go/tools/clientcmd"
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"strings"
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)
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// ConfigGetter abstracts fetching of kubernetes client config
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type ConfigGetter interface {
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Get() (*rest.Config, error)
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Name() string
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}
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// configFromENV is an implementation of ConfigGetter
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type configFromENV struct{}
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// Name returns the name of this config getter instance
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func (c *configFromENV) Name() string {
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return "k8s-config-from-env"
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}
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// Get returns kubernetes rest config based on kubernetes environment values
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func (c *configFromENV) Get() (*rest.Config, error) {
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k8sMaster := env.Get(env.KubeMaster)
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kubeConfig := env.Get(env.KubeConfig)
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if len(strings.TrimSpace(k8sMaster)) == 0 && len(strings.TrimSpace(kubeConfig)) == 0 {
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return nil, errors.New("missing kubernetes master as well as kubeconfig: failed to get kubernetes client config")
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}
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return clientcmd.BuildConfigFromFlags(k8sMaster, kubeConfig)
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}
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// configFromREST is an implementation of ConfigGetter
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type configFromREST struct{}
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// Name returns the name of this config getter instance
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func (c *configFromREST) Name() string {
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return "k8s-config-from-rest"
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}
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// Get returns kubernetes rest config based on in-cluster config implementation
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func (c *configFromREST) Get() (*rest.Config, error) {
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return rest.InClusterConfig()
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}
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// ConfigGetters holds a list of ConfigGetter instances
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//
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// NOTE:
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// This is an implementation of ConfigGetter
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type ConfigGetters []ConfigGetter
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// Name returns the name of this config getter instance
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func (c ConfigGetters) Name() string {
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return "list-of-k8s-config-getter"
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}
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// Get fetches the kubernetes client config that is used to make kubernetes API
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// calls. It makes use of its list of getter instances to fetch kubernetes
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// config.
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func (c ConfigGetters) Get() (config *rest.Config, err error) {
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var errs []error
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for _, g := range c {
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config, err = g.Get()
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if err == nil {
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return
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}
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errs = append(errs, errors.Wrapf(err, "failed to get kubernetes client config via %s", g.Name()))
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}
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// at this point; all getters have failed
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err = errors.Errorf("%+v", errs)
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err = errors.Wrap(err, "failed to get kubernetes client config")
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return
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}
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// Config provides appropriate config getter instances that help in fetching
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// kubernetes client config to invoke kubernetes API calls
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func Config() ConfigGetter {
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return ConfigGetters{&configFromENV{}, &configFromREST{}}
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}
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