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services.go
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/
services.go
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// Copyright 2016-2017 Authors of Cilium
//
// 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 main
import (
"encoding/json"
"path"
"strconv"
"github.com/cilium/cilium/common"
"github.com/cilium/cilium/common/types"
"github.com/cilium/cilium/pkg/kvstore"
log "github.com/Sirupsen/logrus"
)
func updateL3n4AddrIDRef(id types.ServiceID, l3n4AddrID types.L3n4AddrID) error {
key := path.Join(common.ServiceIDKeyPath, strconv.FormatUint(uint64(id), 10))
return kvstore.Client.SetValue(key, l3n4AddrID)
}
// gasNewL3n4AddrID gets and sets a new L3n4Addr ID. If baseID is different than zero,
// KVStore tries to assign that ID first.
func gasNewL3n4AddrID(l3n4AddrID *types.L3n4AddrID, baseID uint32) error {
if baseID == 0 {
var err error
baseID, err = GetMaxServiceID()
if err != nil {
return err
}
}
return kvstore.Client.GASNewL3n4AddrID(common.ServiceIDKeyPath, baseID, l3n4AddrID)
}
// PutL3n4Addr stores the given service in the kvstore and returns the L3n4AddrID
// created for the given l3n4Addr. If baseID is different than 0, it tries to acquire that
// ID to the l3n4Addr.
func PutL3n4Addr(l3n4Addr types.L3n4Addr, baseID uint32) (*types.L3n4AddrID, error) {
log.Debugf("Resolving service %+v", l3n4Addr)
// Retrieve unique SHA256Sum for service
sha256Sum := l3n4Addr.SHA256Sum()
svcPath := path.Join(common.ServicesKeyPath, sha256Sum)
// Lock that sha256Sum
lockKey, err := kvstore.Client.LockPath(svcPath)
if err != nil {
return nil, err
}
defer lockKey.Unlock()
// After lock complete, get svc's path
rmsg, err := kvstore.Client.GetValue(svcPath)
if err != nil {
return nil, err
}
sl4KV := types.L3n4AddrID{}
if rmsg != nil {
if err := json.Unmarshal(rmsg, &sl4KV); err != nil {
return nil, err
}
}
if sl4KV.ID == 0 {
sl4KV.L3n4Addr = l3n4Addr
if err := gasNewL3n4AddrID(&sl4KV, baseID); err != nil {
return nil, err
}
err = kvstore.Client.SetValue(svcPath, sl4KV)
}
return &sl4KV, err
}
func getL3n4AddrID(keyPath string) (*types.L3n4AddrID, error) {
rmsg, err := kvstore.Client.GetValue(keyPath)
if err != nil {
return nil, err
}
if rmsg == nil {
return nil, nil
}
var l3n4AddrID types.L3n4AddrID
if err := json.Unmarshal(rmsg, &l3n4AddrID); err != nil || l3n4AddrID.ID == 0 {
return nil, err
}
return &l3n4AddrID, nil
}
// GetL3n4AddrID returns the L3n4AddrID that belongs to the given id.
func GetL3n4AddrID(id uint32) (*types.L3n4AddrID, error) {
strID := strconv.FormatUint(uint64(id), 10)
return getL3n4AddrID(path.Join(common.ServiceIDKeyPath, strID))
}
// GetL3n4AddrIDBySHA256 returns the L3n4AddrID that have the given SHA256SUM.
func GetL3n4AddrIDBySHA256(sha256sum string) (*types.L3n4AddrID, error) {
return getL3n4AddrID(path.Join(common.ServicesKeyPath, sha256sum))
}
// DeleteL3n4AddrIDByUUID deletes the L3n4AddrID belonging to the given id.
func DeleteL3n4AddrIDByUUID(id uint32) error {
l3n4AddrID, err := GetL3n4AddrID(id)
if err != nil {
return err
}
if l3n4AddrID == nil {
return nil
}
return DeleteL3n4AddrIDBySHA256(l3n4AddrID.SHA256Sum())
}
// DeleteL3n4AddrIDBySHA256 deletes the L3n4AddrID that belong to the serviceL4ID'
// sha256Sum.
func DeleteL3n4AddrIDBySHA256(sha256Sum string) error {
if sha256Sum == "" {
return nil
}
svcPath := path.Join(common.ServicesKeyPath, sha256Sum)
// Lock that sha256Sum
lockKey, err := kvstore.Client.LockPath(svcPath)
if err != nil {
return err
}
defer lockKey.Unlock()
// After lock complete, get label's path
rmsg, err := kvstore.Client.GetValue(svcPath)
if err != nil {
return err
}
if rmsg == nil {
return nil
}
var l3n4AddrID types.L3n4AddrID
if err := json.Unmarshal(rmsg, &l3n4AddrID); err != nil {
return err
}
oldL3n4ID := l3n4AddrID.ID
l3n4AddrID.ID = 0
// update the value in the kvstore
if err := updateL3n4AddrIDRef(oldL3n4ID, l3n4AddrID); err != nil {
return err
}
return kvstore.Client.SetValue(svcPath, l3n4AddrID)
}
// GetMaxServiceID returns the maximum possible free UUID stored in the kvstore.
func GetMaxServiceID() (uint32, error) {
return kvstore.Client.GetMaxID(common.LastFreeServiceIDKeyPath, common.FirstFreeServiceID)
}