ceph-csi/internal/journal/omap.go

/*
Copyright 2020 The Ceph-CSI Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package journal

import (
	"context"

	"github.com/ceph/ceph-csi/internal/util"

	"github.com/ceph/go-ceph/rados"
	"k8s.io/klog"
)

func getOneOMapValue(
	ctx context.Context,
	conn *Connection,
	poolName, namespace, oMapName, oMapKey string) (string, error) {
	// fetch and configure the rados ioctx
	ioctx, err := conn.conn.GetIoctx(poolName)
	if err != nil {
		return "", omapPoolError(poolName, err)
	}
	defer ioctx.Destroy()

	if namespace != "" {
		ioctx.SetNamespace(namespace)
	}

	pairs, err := ioctx.GetOmapValues(
		oMapName, // oid (name of object)
		"",       // startAfter (ignored)
		oMapKey,  // filterPrefix - match only keys with this prefix
		1,        // maxReturn - fetch no more than N values
	)
	switch err {
	case nil:
	case rados.ErrNotFound:
		klog.Errorf(
			util.Log(ctx, "omap not found (pool=%q, namespace=%q, name=%q, key=%q): %v"),
			poolName, namespace, oMapName, oMapKey, err)
		return "", util.NewErrKeyNotFound(oMapKey, err)
	default:
		return "", err
	}

	result, found := pairs[oMapKey]
	if !found {
		klog.Errorf(
			util.Log(ctx, "key not found in omap (pool=%q, namespace=%q, name=%q, key=%q): %v"),
			poolName, namespace, oMapName, oMapKey, err)
		return "", util.NewErrKeyNotFound(oMapKey, nil)
	}
	klog.Infof(
		util.Log(ctx, "XXX key found in omap! (pool=%q, namespace=%q, name=%q, key=%q): %v"),
		poolName, namespace, oMapName, oMapKey, result)
	return string(result), nil
}

func removeOneOMapKey(
	ctx context.Context,
	conn *Connection,
	poolName, namespace, oMapName, oMapKey string) error {
	// fetch and configure the rados ioctx
	ioctx, err := conn.conn.GetIoctx(poolName)
	if err != nil {
		return omapPoolError(poolName, err)
	}
	defer ioctx.Destroy()

	if namespace != "" {
		ioctx.SetNamespace(namespace)
	}

	err = ioctx.RmOmapKeys(oMapName, []string{oMapKey})
	if err != nil {
		klog.Errorf(
			util.Log(ctx, "failed removing omap key (pool=%q, namespace=%q, name=%q, key=%q): %v"),
			poolName, namespace, oMapName, oMapKey, err)
	} else {
		klog.Infof(
			util.Log(ctx, "XXX removed omap key (pool=%q, namespace=%q, name=%q, key=%q, ): %v"),
			poolName, namespace, oMapName, oMapKey, err)
	}
	return err
}

func setOneOMapKey(
	ctx context.Context,
	conn *Connection,
	poolName, namespace, oMapName, oMapKey, keyValue string) error {
	// fetch and configure the rados ioctx
	ioctx, err := conn.conn.GetIoctx(poolName)
	if err != nil {
		return omapPoolError(poolName, err)
	}
	defer ioctx.Destroy()

	if namespace != "" {
		ioctx.SetNamespace(namespace)
	}

	pairs := map[string][]byte{
		oMapKey: []byte(keyValue),
	}
	err = ioctx.SetOmap(oMapName, pairs)
	if err != nil {
		klog.Errorf(
			util.Log(ctx, "failed setting omap key (pool=%q, namespace=%q, name=%q, key=%q, value=%q): %v"),
			poolName, namespace, oMapName, oMapKey, keyValue, err)
	} else {
		klog.Infof(
			util.Log(ctx, "XXX set omap key (pool=%q, namespace=%q, name=%q, key=%q, value=%q): %v"),
			poolName, namespace, oMapName, oMapKey, keyValue, err)
	}
	return err
}

func omapPoolError(poolName string, err error) error {
	if err == rados.ErrNotFound {
		return util.NewErrPoolNotFound(poolName, err)
	}
	return err
}