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sharded.go
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sharded.go
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package main
import (
"fmt"
"log"
"os"
"os/exec"
"regexp"
"runtime"
"strconv"
"strings"
"time"
)
type Sharded struct {
ShardSvr []*ReplSet
Mongos []*Mongos
ConfigSvr *ReplSet
Port int
Auth bool
NumShards int
NumConfig int
ShardConfig string
ShardNum int
Cmdlines [][]string
Script bool
}
type Mongos struct {
Auth bool
Port int
Config string
Cmdlines [][]string
}
func (m *Mongos) Init(port int, config string, auth bool) {
m.Auth = auth
m.Port = port
m.Config = config
currdir, err := os.Getwd()
if err != nil {
log.Fatal(err)
}
cmdline := []string{
"mongos",
"--port", strconv.Itoa(port),
"--configdb", config,
"--logpath", fmt.Sprintf("%s/%s/%d/mongos.log", currdir, Datadir, port),
}
if auth {
cmdline = append(cmdline, "--keyFile", fmt.Sprintf("%s/keyfile.txt", Datadir))
}
switch runtime.GOOS {
case "windows":
cmdline = append([]string{"start", "/b"}, cmdline...)
default:
cmdline = append(cmdline, []string{"--fork"}...)
}
m.Cmdlines = append(m.Cmdlines, []string{
"mkdir", fmt.Sprintf("%s/%d", Datadir, port),
})
m.Cmdlines = append(m.Cmdlines, cmdline)
}
func (m *Mongos) Wait_for_primary() {
var cmdline []string
cmdline = append(cmdline, []string{
"mongo",
"--port", strconv.Itoa(m.Port),
"--quiet",
"--eval", "db.isMaster()",
}...)
fmt.Println("Waiting for mongos...")
primary := false
i := 0
for !primary && i < 20 {
com := exec.Command(cmdline[0], cmdline[1:]...)
out, err := com.CombinedOutput()
if err != nil {
log.Printf("isMaster on mongos failed with %s\n", err)
}
primary = strings.Contains(string(out), "\"ismaster\" : true")
time.Sleep(2 * time.Second)
i += 1
}
if !primary {
fmt.Println("Primary not found after 40 seconds")
os.Exit(1)
}
}
func (sh *Sharded) Init(port int, numshards int, shardnum int, shardcfg string, numconfig int, auth bool, script bool) {
sh.NumShards = numshards
sh.ShardNum = shardnum
sh.ShardConfig = shardcfg
sh.NumConfig = numconfig
sh.Port = port
sh.Auth = auth
sh.Script = script
sh.parse_config()
fmt.Println("# Port:", sh.Port)
fmt.Println("# Num Shards:", sh.NumShards)
fmt.Println("# ShardSvr Num:", sh.ShardNum)
fmt.Println("# ShardSvr Cfg:", sh.ShardConfig)
fmt.Println("# ConfigSvr Num:", sh.NumConfig)
fmt.Println("# Auth:", sh.Auth)
fmt.Println()
for i := 0; i < sh.NumShards; i++ {
sh_i := new(ReplSet)
rsname := fmt.Sprintf("shard%02d", i)
sh_i.Init(sh.ShardNum, sh.Port+1+(i*sh.ShardNum), sh.ShardConfig, rsname, sh.Auth, false, sh.Script)
sh.ShardSvr = append(sh.ShardSvr, sh_i)
}
ConfigSvr := new(ReplSet)
rsconfig := "P" + strings.Repeat("S", numconfig-1)
ConfigSvr.Init(sh.NumConfig, sh.Port+1+(sh.NumShards*sh.ShardNum), rsconfig, "config", sh.Auth, false, sh.Script)
sh.ConfigSvr = ConfigSvr
mongos := new(Mongos)
mongos.Init(sh.Port, sh.ConfigSvr.Connstr, sh.Auth)
sh.Mongos = append(sh.Mongos, mongos)
for i := 0; i < sh.NumShards; i++ {
sh.Cmdlines = append(sh.Cmdlines, sh.ShardSvr[i].Cmdlines...)
}
sh.Cmdlines = append(sh.Cmdlines, sh.ConfigSvr.Cmdlines...)
sh.Cmdlines = append(sh.Cmdlines, mongos.Cmdlines...)
}
func (sh *Sharded) parse_config() {
re_config := regexp.MustCompile("(?i)^PS*A*$")
switch {
case sh.ShardConfig == "" || sh.ShardNum != 1:
sh.ShardConfig = "P" + strings.Repeat("S", sh.ShardNum-1)
case sh.ShardConfig != "P" && re_config.MatchString(sh.ShardConfig):
sh.ShardNum = len(sh.ShardConfig)
case !re_config.MatchString(sh.ShardConfig):
fmt.Println("Invalid replica set configuration:", sh.ShardConfig)
os.Exit(1)
}
}
func (sh *Sharded) Cmd_addshards() [][]string {
var cmdline [][]string
var cmd []string
for _, s := range sh.ShardSvr {
cmd = []string{
"mongo",
"--port", strconv.Itoa(sh.Port),
"--eval", fmt.Sprintf("sh.addShard('%s')", s.Connstr),
}
cmdline = append(cmdline, cmd)
}
return cmdline
}
func (sh *Sharded) Cmd_adduser() []string {
return []string{
"mongo", "admin",
"--port", fmt.Sprintf("%d", sh.Port),
"--eval", "db.createUser({user: 'user', pwd: 'password', roles: ['root']})",
}
}
func (sh *Sharded) Deploy() {
if sh.Script {
fmt.Println(Util_cmd_script(sh.Cmdlines))
} else {
sh.ShardSvr[0].Create_keyfile()
for _, shard := range sh.ShardSvr {
Util_runcommand_string_string(shard.Cmdlines)
shard.Wait_for_primary()
}
Util_runcommand_string_string(sh.ConfigSvr.Cmdlines)
sh.ConfigSvr.Wait_for_primary()
Util_runcommand_string_string(sh.Mongos[0].Cmdlines)
sh.Mongos[0].Wait_for_primary()
Util_runcommand_string_string(sh.Cmd_addshards())
if sh.Auth {
Util_runcommand_string(sh.Cmd_adduser())
}
Util_create_start_script(sh.Cmdlines)
}
}