forked from rook/rook
127 lines
4.2 KiB
Go
127 lines
4.2 KiB
Go
/*
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Copyright 2016 The Rook Authors. All rights reserved.
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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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Some of the code below came from https://github.com/coreos/etcd-operator
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which also has the apache 2.0 license.
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*/
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// Package mds to manage a rook file system.
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package mds
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import (
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"fmt"
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opkit "github.com/rook/operator-kit"
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"github.com/rook/rook/pkg/clusterd"
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"github.com/rook/rook/pkg/operator/k8sutil"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/client-go/tools/cache"
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)
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// FilesystemController represents a controller for file system custom resources
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type FilesystemController struct {
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context *clusterd.Context
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scheme *runtime.Scheme
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versionTag string
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hostNetwork bool
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}
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// NewFilesystemController create controller for watching file system custom resources created
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func NewFilesystemController(context *clusterd.Context, versionTag string, hostNetwork bool) *FilesystemController {
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return &FilesystemController{
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context: context,
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versionTag: versionTag,
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hostNetwork: hostNetwork,
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}
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}
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// StartWatch watches for instances of Filesystem custom resources and acts on them
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func (c *FilesystemController) StartWatch(namespace string, stopCh chan struct{}) error {
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client, scheme, err := opkit.NewHTTPClient(k8sutil.CustomResourceGroup, k8sutil.V1Alpha1, schemeBuilder)
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if err != nil {
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return fmt.Errorf("failed to get a k8s client for watching file system resources: %v", err)
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}
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c.scheme = scheme
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resourceHandlerFuncs := cache.ResourceEventHandlerFuncs{
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AddFunc: c.onAdd,
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UpdateFunc: c.onUpdate,
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DeleteFunc: c.onDelete,
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}
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logger.Infof("start watching filesystem resource in namespace %s", namespace)
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watcher := opkit.NewWatcher(FilesystemResource, namespace, resourceHandlerFuncs, client)
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go watcher.Watch(&Filesystem{}, stopCh)
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return nil
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}
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func (c *FilesystemController) onAdd(obj interface{}) {
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filesystem := obj.(*Filesystem)
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// NEVER modify objects from the store. It's a read-only, local cache.
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// Use scheme.Copy() to make a deep copy of original object.
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copyObj, err := c.scheme.Copy(filesystem)
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if err != nil {
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fmt.Printf("failed to create a deep copy of file system: %v\n", err)
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return
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}
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fsCopy := copyObj.(*Filesystem)
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err = fsCopy.Create(c.context, c.versionTag, c.hostNetwork)
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if err != nil {
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logger.Errorf("failed to create file system %s. %+v", filesystem.Name, err)
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}
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}
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func (c *FilesystemController) onUpdate(oldObj, newObj interface{}) {
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oldFS := oldObj.(*Filesystem)
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newFS := newObj.(*Filesystem)
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if !filesystemChanged(oldFS.Spec, newFS.Spec) {
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logger.Debugf("filesystem %s not updated", newFS.Name)
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return
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}
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// if the file system is modified, allow the file system to be created if it wasn't already
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logger.Infof("updating filesystem %s", newFS)
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err := newFS.Create(c.context, c.versionTag, c.hostNetwork)
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if err != nil {
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logger.Errorf("failed to create (modify) file system %s. %+v", newFS.Name, err)
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}
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}
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func (c *FilesystemController) onDelete(obj interface{}) {
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filesystem := obj.(*Filesystem)
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err := filesystem.Delete(c.context)
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if err != nil {
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logger.Errorf("failed to delete file system %s. %+v", filesystem.Name, err)
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}
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}
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func filesystemChanged(oldFS, newFS FilesystemSpec) bool {
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if len(oldFS.DataPools) != len(newFS.DataPools) {
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logger.Infof("number of data pools changed from %d to %d", len(oldFS.DataPools), len(newFS.DataPools))
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return true
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}
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if oldFS.MetadataServer.ActiveCount != newFS.MetadataServer.ActiveCount {
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logger.Infof("number of mds active changed from %d to %d", oldFS.MetadataServer.ActiveCount, newFS.MetadataServer.ActiveCount)
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return true
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}
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if oldFS.MetadataServer.ActiveStandby != newFS.MetadataServer.ActiveStandby {
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logger.Infof("mds active standby changed from %t to %t", oldFS.MetadataServer.ActiveStandby, newFS.MetadataServer.ActiveStandby)
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return true
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}
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return false
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}
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