/
main.go
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/
main.go
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package main
import (
"fmt"
"log"
"os"
"strings"
"github.com/codegangsta/cli"
"github.com/therealbill/libredis/client"
"github.com/therealbill/libredis/structures"
)
var (
app *cli.App
slaves []string
masterconn *client.Redis
sentinelconn *client.Redis
primarypool []structures.SlaveInfo
// Version represents the released version of the software
Version string
)
func getSentinelConnection(c *cli.Context) (err error) {
log.Print("Getting Sentinel connection")
sentinelconn, err = client.DialAddress(c.GlobalString("sentinel"))
return err
}
func getMaster(c *cli.Context) (structures.MasterAddress, error) {
log.Printf("Getting master connection")
return sentinelconn.SentinelGetMaster(c.GlobalString("podname"))
}
func main() {
app = cli.NewApp()
app.Name = "daisy"
app.Usage = "Create and alter a slavepool in a chained replication configuration"
app.Version = Version
app.EnableBashCompletion = true
author := cli.Author{Name: "Bill Anderson", Email: "therealbill@me.com"}
app.Authors = append(app.Authors, author)
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "podname, n",
Usage: "The name of the pod",
},
cli.StringFlag{
Name: "sentinel, s",
Value: "localhost:26379",
Usage: "Address of the sentinel ",
EnvVar: "SentinelAddress",
},
}
app.Commands = []cli.Command{
{
Name: "slavepool",
Usage: "Actions taken on the secondary slave pool.",
Subcommands: []cli.Command{
{
Name: "create",
Usage: "Create a read-only, non-promotable slave pool.",
Action: createSlavePool,
Flags: []cli.Flag{
cli.StringFlag{
Name: "slaves",
Usage: "Comma separated list of IP:PORT listing for the slaves to put into the pool",
},
cli.StringFlag{
Name: "syncpolicy",
Usage: "The policy to use when enslaving the pool to the master pod.",
Value: "singleslave",
},
},
},
},
},
}
app.Run(os.Args)
}
func createSlavePool(c *cli.Context) {
if c.String("slaves") == "" {
log.Print("Need a list of existing Redis instances to use as slaves")
return
}
slaves = strings.Split(c.String("slaves"), ",")
log.Printf("Pod: %s", c.GlobalString("podname"))
log.Printf("Slave Pool Policy: %s", c.String("syncpolicy"))
for _, slave := range slaves {
log.Printf("Secondary Slave: %s\n", slave)
}
err := getSentinelConnection(c)
if err != nil {
log.Fatalf("Error: %v", err)
}
master, err := getMaster(c)
if err != nil {
log.Fatalf("getmaster fail: %v", err)
}
log.Printf("Got master : %+v\n", master)
getPrimarySlavePool(c)
switch c.String("syncpolicy") {
case "direct":
enslaveOneForOne(c)
case "ring":
enslaveRing(c)
case "single":
enslaveSingleSlave(c)
}
}
func getPrimarySlavePool(c *cli.Context) {
log.Print("Pulling primary slavepool")
var err error
primarypool, err = sentinelconn.SentinelSlaves(c.GlobalString("podname"))
if err != nil {
log.Fatalf("FAIL: %v", err)
}
for _, slave := range primarypool {
log.Printf("Primary Slave Address: %s:%d\n", slave.Host, slave.Port)
}
}
func enslaveSingleSlave(c *cli.Context) {
//TODO: make it random?
target := primarypool[0]
for _, saddr := range slaves {
slc, err := client.DialAddress(saddr)
if err != nil {
log.Printf("SLAVEPOOL ERROR [%s] %+v\n", saddr, err)
break
}
err = slc.SlaveOf(target.Host, fmt.Sprintf("%d", target.Port))
if err != nil {
log.Printf("SLAVEOF ERROR [%s] %+v\n", saddr, err)
}
log.Printf("Enslaved %s to %s:%d\n", saddr, target.Host, target.Port)
}
}
func enslaveOneForOne(c *cli.Context) {
for x, saddr := range slaves {
target := primarypool[x]
slc, err := client.DialAddress(saddr)
if err != nil {
log.Printf("SLAVEPOOL ERROR [%s] %+v\n", saddr, err)
break
}
err = slc.SlaveOf(target.Host, fmt.Sprintf("%d", target.Port))
if err != nil {
log.Printf("SLAVEOF ERROR [%s] %+v:\n", saddr, err)
}
log.Printf("Enslaved %s to %s:%d\n", saddr, target.Host, target.Port)
}
}
func enslaveRing(c *cli.Context) {
added := 1
var target structures.SlaveInfo
for x, saddr := range slaves {
index := x % len(primarypool)
target = primarypool[index]
slc, err := client.DialAddress(saddr)
if err != nil {
log.Printf("SLAVEPOOL ERROR [%s] %+v\n", saddr, err)
break
}
err = slc.SlaveOf(target.Host, fmt.Sprintf("%d", target.Port))
if err != nil {
log.Printf("SLAVEOF ERROR [%s] %+v:\n", saddr, err)
}
log.Printf("Enslaved %s to %s:%d\n", saddr, target.Host, target.Port)
added++
}
}