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ring.go
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/
ring.go
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//
// Copyright (c) 2014 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 (
"bytes"
"encoding/json"
"errors"
"fmt"
"os"
"os/exec"
"sync"
"time"
)
type BrickNode struct {
NodeId string `json:"meta"`
DeviceId string `json:"device"`
}
type BrickNodes []BrickNode
type RingOutput struct {
Nodes BrickNodes `json:"nodes"`
Partition int `json:"partition"`
}
type GlusterRing struct {
db *GlusterFSDB
ringCreateCh chan bool
lock sync.RWMutex
}
func (g *GlusterRing) createServer() {
for {
// Wait for a command to start creating the ring
select {
case <-g.ringCreateCh:
// This is not very efficient, but it works for now
g.lock.Lock()
}
// Once we get the ring command. Wait a maximum
// of 5 seconds for more requests. That way we only
// do it once
for created := false; !created; {
timeout := time.After(time.Second * 5)
select {
case <-g.ringCreateCh:
continue
case <-timeout:
err := g.createRing()
// :TODO: Log
if err != nil {
// :TODO: May want to try again a few times if we fail.
fmt.Println(err)
}
created = true
}
}
g.lock.Unlock()
}
}
func NewGlusterRing(db *GlusterFSDB) *GlusterRing {
g := &GlusterRing{
db: db,
ringCreateCh: make(chan bool),
}
go g.createServer()
return g
}
func (g *GlusterRing) CreateRing() {
g.ringCreateCh <- true
}
func (g *GlusterRing) createRing() error {
os.Remove("heketi.builder")
os.Remove("heketi.ring.gz")
args := []string{
"heketi.builder",
"create",
"16",
"2",
"1",
}
// Create new ring
err := exec.Command("swift-ring-builder", args...).Run()
if err != nil {
return errors.New("Unable to create brick placement db")
}
err = g.db.Reader(func() error {
// Add all devices
for nodeid, node := range g.db.nodes {
for devid, dev := range node.Info.Devices {
args := []string{
"heketi.builder",
"add",
fmt.Sprintf("r1z%v-%v:80/%v_%v",
node.Info.Zone,
node.Info.Name,
devid,
nodeid),
fmt.Sprintf("%v", dev.Weight),
}
err := exec.Command("swift-ring-builder", args...).Run()
if err != nil {
return err
}
}
}
return nil
})
if err != nil {
return nil
}
// Rebalance
return exec.Command("swift-ring-builder", "heketi.builder", "rebalance").Run()
}
func (g *GlusterRing) GetNodes(brick_num int, id string) (BrickNodes, error) {
var out bytes.Buffer
var nodes RingOutput
g.lock.RLock()
defer g.lock.RUnlock()
args := []string{
fmt.Sprintf("%v", brick_num),
id,
}
cmd := exec.Command("./ring.py", args...)
cmd.Stdout = &out
err := cmd.Run()
if err != nil {
return nil, err
}
if err := json.Unmarshal(out.Bytes(), &nodes); err != nil {
return nil, err
}
return nodes.Nodes, nil
}