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allocator_simple.go
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/
allocator_simple.go
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//
// Copyright (c) 2015 The heketi 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 glusterfs
import (
"github.com/boltdb/bolt"
"sync"
)
// Simple allocator contains a map to rings of clusters
type SimpleAllocator struct {
rings map[string]*SimpleAllocatorRing
lock sync.Mutex
}
// Create a new simple allocator
func NewSimpleAllocator() *SimpleAllocator {
s := &SimpleAllocator{}
s.rings = make(map[string]*SimpleAllocatorRing)
return s
}
// Create a new simple allocator and initialize it with data from the db
func NewSimpleAllocatorFromDb(db *bolt.DB) *SimpleAllocator {
s := NewSimpleAllocator()
err := db.View(func(tx *bolt.Tx) error {
clusters, err := ClusterList(tx)
if err != nil {
return err
}
for _, clusterId := range clusters {
cluster, err := NewClusterEntryFromId(tx, clusterId)
if err != nil {
return err
}
for _, nodeId := range cluster.Info.Nodes {
node, err := NewNodeEntryFromId(tx, nodeId)
if err != nil {
return err
}
// Check node is online
if !node.isOnline() {
continue
}
for _, deviceId := range node.Devices {
device, err := NewDeviceEntryFromId(tx, deviceId)
if err != nil {
return err
}
// Check device is online
if !device.isOnline() {
continue
}
// Add device to ring
err = s.AddDevice(cluster, node, device)
if err != nil {
return err
}
}
}
}
return nil
})
if err != nil {
return nil
}
return s
}
func (s *SimpleAllocator) AddDevice(cluster *ClusterEntry,
node *NodeEntry,
device *DeviceEntry) error {
s.lock.Lock()
defer s.lock.Unlock()
// Create a new cluster id if one is not available
clusterId := cluster.Info.Id
if _, ok := s.rings[clusterId]; !ok {
s.rings[clusterId] = NewSimpleAllocatorRing()
}
s.rings[clusterId].Add(&SimpleDevice{
zone: node.Info.Zone,
nodeId: node.Info.Id,
deviceId: device.Info.Id,
})
return nil
}
func (s *SimpleAllocator) RemoveDevice(cluster *ClusterEntry,
node *NodeEntry,
device *DeviceEntry) error {
s.lock.Lock()
defer s.lock.Unlock()
// Check the cluster id is in the map
clusterId := cluster.Info.Id
if _, ok := s.rings[clusterId]; !ok {
logger.LogError("Unknown cluster id requested: %v", clusterId)
return ErrNotFound
}
// Remove device from ring
s.rings[clusterId].Remove(&SimpleDevice{
zone: node.Info.Zone,
nodeId: node.Info.Id,
deviceId: device.Info.Id,
})
return nil
}
func (s *SimpleAllocator) RemoveCluster(clusterId string) error {
s.lock.Lock()
defer s.lock.Unlock()
// Check the cluster id is in the map
if _, ok := s.rings[clusterId]; !ok {
logger.LogError("Unknown cluster id requested: %v", clusterId)
return ErrNotFound
}
// Remove cluster from map
delete(s.rings, clusterId)
return nil
}
func (s *SimpleAllocator) getDeviceList(clusterId, brickId string) (SimpleDevices, error) {
s.lock.Lock()
defer s.lock.Unlock()
if _, ok := s.rings[clusterId]; !ok {
logger.LogError("Unknown cluster id requested: %v", clusterId)
return nil, ErrNotFound
}
ring := s.rings[clusterId]
ring.Rebalance()
devicelist := ring.GetDeviceList(brickId)
return devicelist, nil
}
func (s *SimpleAllocator) GetNodes(clusterId, brickId string) (<-chan string,
chan<- struct{}, <-chan error) {
// Initialize channels
device, done := make(chan string), make(chan struct{})
// Make sure to make a buffered channel for the error, so we can
// set it and return
errc := make(chan error, 1)
// Get the list of devices for this brick id
devicelist, err := s.getDeviceList(clusterId, brickId)
if err != nil {
errc <- err
close(device)
return device, done, errc
}
// Start generator in a new goroutine
go func() {
defer func() {
errc <- nil
close(device)
}()
for _, d := range devicelist {
select {
case device <- d.deviceId:
case <-done:
return
}
}
}()
return device, done, errc
}