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standards.go
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standards.go
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package orchestrator
import (
"bufio"
"fmt"
"io"
"os"
"os/exec"
"strconv"
"sync"
"time"
"github.com/botlabs-gg/yagpdb/v2/lib/discordgo"
)
// StdShardCountProvider is a standard implementation of RecommendedShardCountProvider
type StdShardCountProvider struct {
DiscordSession *discordgo.Session
}
func (sc *StdShardCountProvider) GetTotalShardCount() (int, error) {
gwBot, err := sc.DiscordSession.GatewayBot()
if err != nil {
return 0, err
}
return gwBot.Shards, nil
}
type IDGenerator interface {
GenerateID() (string, error)
}
type StdNodeLauncher struct {
IDGenerator IDGenerator
LaunchCmdName string
LaunchArgs []string
VersionCmdName string
VersionArgs []string
mu sync.Mutex
lastTimeLaunchedNode time.Time
}
func NewNodeLauncher(cmdName string, args []string, idGen IDGenerator) NodeLauncher {
return &StdNodeLauncher{
IDGenerator: idGen,
LaunchCmdName: cmdName,
LaunchArgs: args,
}
}
// LaunchNewNode implements NodeLauncher.LaunchNewNode
func (nl *StdNodeLauncher) LaunchNewNode() (string, error) {
// ensure were not starting nodes too fast since the id generation only does millisecond unique ids
nl.mu.Lock()
if time.Since(nl.lastTimeLaunchedNode) < time.Millisecond*100 {
time.Sleep(time.Millisecond * 100)
}
nl.lastTimeLaunchedNode = time.Now()
nl.mu.Unlock()
// generate the node id
var err error
id := ""
if nl.IDGenerator != nil {
id, err = nl.IDGenerator.GenerateID()
} else {
id = nl.GenerateID()
}
if err != nil {
return "", err
}
args := append(nl.LaunchArgs, "-nodeid", id)
// launch it
cmd := exec.Command(nl.LaunchCmdName, args...)
cmd.Env = os.Environ()
wd, err := os.Getwd()
if err != nil {
return "", err
}
cmd.Dir = wd
stdOut, err := cmd.StdoutPipe()
if err != nil {
return "", err
}
go nl.PrintOutput(stdOut)
stdErr, err := cmd.StderrPipe()
if err != nil {
return "", err
}
go nl.PrintOutput(stdErr)
err = cmd.Start()
return id, err
}
func (nl *StdNodeLauncher) GenerateID() string {
tms := time.Now().UnixNano() / 1000000
st := strconv.FormatInt(tms, 36)
host, _ := os.Hostname()
return fmt.Sprintf("%s-%s", host, st)
}
func (nl *StdNodeLauncher) PrintOutput(reader io.Reader) {
breader := bufio.NewReader(reader)
for {
s, err := breader.ReadString('\n')
if len(s) > 0 {
s = s[:len(s)-1]
}
fmt.Println("NODE: " + s)
if err != nil {
break
}
}
}
// LaunchVersion implements NodeLauncher.LaunchVersion
func (nl *StdNodeLauncher) LaunchVersion() (string, error) {
// launch it
cmd := exec.Command(nl.VersionCmdName, nl.VersionArgs...)
cmd.Env = os.Environ()
wd, err := os.Getwd()
if err != nil {
return "", err
}
cmd.Dir = wd
out, err := cmd.Output()
if err != nil {
return "", err
}
return string(out), nil
}