mirror of
https://github.com/k3s-io/k3s.git
synced 2024-06-07 19:41:36 +00:00
98 lines
2.7 KiB
Go
98 lines
2.7 KiB
Go
/*
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Copyright 2016 The Kubernetes 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 factory
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import (
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"context"
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"fmt"
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"sync/atomic"
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"time"
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"github.com/ibuildthecloud/kvsql/clientv3"
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"github.com/ibuildthecloud/kvsql/storage"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/apiserver/pkg/storage"
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"k8s.io/apiserver/pkg/storage/storagebackend"
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"k8s.io/apiserver/pkg/storage/value"
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)
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func NewKVSQLHealthCheck(c storagebackend.Config) (func() error, error) {
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// constructing the etcd v3 client blocks and times out if etcd is not available.
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// retry in a loop in the background until we successfully create the client, storing the client or error encountered
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clientValue := &atomic.Value{}
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clientErrMsg := &atomic.Value{}
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clientErrMsg.Store("etcd client connection not yet established")
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go wait.PollUntil(time.Second, func() (bool, error) {
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client, err := newETCD3Client(c)
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if err != nil {
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clientErrMsg.Store(err.Error())
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return false, nil
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}
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clientValue.Store(client)
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clientErrMsg.Store("")
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return true, nil
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}, wait.NeverStop)
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return func() error {
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if errMsg := clientErrMsg.Load().(string); len(errMsg) > 0 {
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return fmt.Errorf(errMsg)
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}
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client := clientValue.Load().(*clientv3.Client)
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ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
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defer cancel()
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if _, err := client.Cluster.MemberList(ctx); err != nil {
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return fmt.Errorf("error listing etcd members: %v", err)
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}
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return nil
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}, nil
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}
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func newETCD3Client(c storagebackend.Config) (*clientv3.Client, error) {
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cfg := clientv3.Config{
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Endpoints: c.ServerList,
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}
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if len(cfg.Endpoints) == 0 {
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cfg.Endpoints = []string{"sqlite://"}
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}
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client, err := clientv3.New(cfg)
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return client, err
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}
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func NewKVSQLStorage(c storagebackend.Config) (storage.Interface, func(), error) {
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client, err := newETCD3Client(c)
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if err != nil {
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return nil, nil, err
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}
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ctx, cancel := context.WithCancel(context.Background())
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etcd3.StartCompactor(ctx, client, c.CompactionInterval)
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destroyFunc := func() {
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cancel()
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client.Close()
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}
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transformer := c.Transformer
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if transformer == nil {
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transformer = value.IdentityTransformer
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}
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return etcd3.New(client, c.Codec, c.Prefix, transformer, c.Paging), destroyFunc, nil
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}
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