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peers.go
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/
peers.go
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// Copyright 2023 The ClusterLink 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 store
import (
"fmt"
"sync"
"github.com/sirupsen/logrus"
"github.com/clusterlink-net/clusterlink/pkg/store"
)
// Peers is a cached persistent store of peers.
type Peers struct {
lock sync.RWMutex
cache map[string]*Peer
store store.ObjectStore
logger *logrus.Entry
}
// Create a peer.
func (s *Peers) Create(peer *Peer) error {
s.logger.Infof("Creating: '%s'.", peer.Name)
if peer.Version > peerStructVersion {
return fmt.Errorf("incompatible peer version %d, expected: %d",
peer.Version, peerStructVersion)
}
// persist to store
if err := s.store.Create(peer.Name, peer); err != nil {
return err
}
s.lock.Lock()
defer s.lock.Unlock()
// store in cache
s.cache[peer.Name] = peer
return nil
}
// Update a peer.
func (s *Peers) Update(name string, mutator func(*Peer) *Peer) error {
s.logger.Infof("Updating: '%s'.", name)
// persist to store
var peer *Peer
err := s.store.Update(name, func(a any) any {
peer = mutator(a.(*Peer))
return peer
})
if err != nil {
return err
}
s.lock.Lock()
defer s.lock.Unlock()
// store in cache
s.cache[name] = peer
return nil
}
// Get a peer.
func (s *Peers) Get(name string) *Peer {
s.logger.Debugf("Getting '%s'.", name)
s.lock.RLock()
defer s.lock.RUnlock()
return s.cache[name]
}
// Delete a peer.
func (s *Peers) Delete(name string) (*Peer, error) {
s.logger.Infof("Deleting: '%s'.", name)
// delete from store
if err := s.store.Delete(name); err != nil {
return nil, err
}
s.lock.Lock()
defer s.lock.Unlock()
// delete from cache
val := s.cache[name]
delete(s.cache, name)
return val, nil
}
// GetAll returns all peers in the cache.
func (s *Peers) GetAll() []*Peer {
s.logger.Debug("Getting all peers.")
s.lock.RLock()
defer s.lock.RUnlock()
peers := make([]*Peer, 0, len(s.cache))
for _, peer := range s.cache {
peers = append(peers, peer)
}
return peers
}
// Len returns the number of cached peers.
func (s *Peers) Len() int {
s.lock.RLock()
defer s.lock.RUnlock()
return len(s.cache)
}
// init loads the cache with items from the backing store.
func (s *Peers) init() error {
s.logger.Info("Initializing.")
// get all peers from backing store
peers, err := s.store.GetAll()
if err != nil {
return err
}
s.lock.Lock()
defer s.lock.Unlock()
// store all peers to the cache
for _, object := range peers {
if peer, ok := object.(*Peer); ok {
s.cache[peer.Name] = peer
}
}
return nil
}
// NewPeers returns a new cached store of peers.
func NewPeers(manager store.Manager) (*Peers, error) {
logger := logrus.WithField("component", "controlplane.store.peers")
peers := &Peers{
cache: make(map[string]*Peer),
store: manager.GetObjectStore(peerStoreName, Peer{}),
logger: logger,
}
if err := peers.init(); err != nil {
return nil, err
}
return peers, nil
}