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package main
import (
"fmt"
"github.com/akamensky/argparse"
"github.com/gin-gonic/gin"
"github.com/keuin/ymux-go/config"
"github.com/keuin/ymux-go/instrument"
"github.com/keuin/ymux-go/yggdrasil"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/collectors"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"os"
"regexp"
"strings"
"time"
)
var processStartTime = time.Now()
const applicationJson = "application/json"
func main() {
p := argparse.NewParser("ymux-go", "Minecraft Yggdrasil server mux")
configFile := p.String("c", "config", &argparse.Options{
Required: true,
Help: "path to the config file",
})
err := p.Parse(os.Args)
if err != nil {
fmt.Print(p.Usage(err))
return
}
cfg, err := config.Read(*configFile)
if err != nil {
panic(fmt.Errorf("error reading config file: %w", err))
}
err = cfg.Validate()
if err != nil {
panic(fmt.Errorf("config validation failed: %w", err))
}
ss, err := createServers(cfg)
if err != nil {
panic(err)
}
s := yggdrasil.NewMuxServer(ss...)
if cfg.Debug {
log.Logger = log.Logger.Level(zerolog.DebugLevel)
} else {
log.Logger = log.Logger.Level(zerolog.InfoLevel)
gin.SetMode(gin.ReleaseMode)
}
log.Debug().Msg("debug mode is enabled")
r := gin.Default()
r.GET("/", func(c *gin.Context) {
// servers with authlib-injector will call this API on boot
// we need this to make them happy
c.Data(200, applicationJson, []byte(`{}`))
})
handlers := []gin.HandlerFunc{func(c *gin.Context) {
var args struct {
Username string `form:"username"`
ServerID string `form:"serverId"`
}
err := c.ShouldBindQuery(&args)
if err != nil {
_ = c.AbortWithError(400, err)
instrument.SetInstrument(c, instrument.RequestInfo{
Success: false,
Username: args.Username,
ServerID: args.ServerID,
})
return
}
r, err := s.HasJoined(args.Username, args.ServerID)
if err != nil {
log.Error().Err(err).Msg("ymux hasJoined API failed")
_ = c.AbortWithError(500, err)
instrument.SetInstrument(c, instrument.RequestInfo{
Success: false,
Username: args.Username,
ServerID: args.ServerID,
})
return
}
log.Info().
Str("username", args.Username).
Str("serverId", args.ServerID).
Str("yggdrasilServer", r.ServerName).
Bool("hasJoined", r.HasJoined()).
Msg("ymux hasJoined API OK")
instrument.SetInstrument(c, instrument.RequestInfo{
Success: true,
Username: args.Username,
ServerID: args.ServerID,
LoggedIn: r.HasJoined(),
})
if r.HasJoined() {
c.Data(200, applicationJson, r.RawBody)
return
}
c.Status(204)
}}
// setup prometheus metrics exporter
if cfg.Metrics.Enabled {
reg := prometheus.NewRegistry()
reg.MustRegister(
collectors.NewBuildInfoCollector(),
collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
collectors.NewGoCollector(
collectors.WithGoCollectorRuntimeMetrics(
collectors.GoRuntimeMetricsRule{Matcher: regexp.MustCompile("/.*")},
),
),
)
r.GET("/metrics", gin.WrapH(promhttp.HandlerFor(reg, promhttp.HandlerOpts{
ErrorLog: promZeroLogger{},
ErrorHandling: promhttp.HTTPErrorOnError,
Registry: nil,
DisableCompression: true,
MaxRequestsInFlight: 0,
Timeout: 0,
EnableOpenMetrics: true,
ProcessStartTime: processStartTime,
})))
ex := instrument.NewExporter(reg)
handlers = append([]gin.HandlerFunc{ex.Instrument}, handlers...)
log.Info().Msg("prometheus metrics exporter enabled")
}
r.GET("/sessionserver/session/minecraft/hasJoined", handlers...)
err = r.Run(cfg.Listen)
if err != nil {
panic(fmt.Errorf("error running http server: %w", err))
}
}
type promZeroLogger struct {
}
func (p promZeroLogger) Println(v ...interface{}) {
log.Error().Str("msg", fmt.Sprintln(v...)).Msg("prometheus metrics exporter error")
}
func createServers(cfg *config.Config) ([]yggdrasil.Server, error) {
var servers []yggdrasil.Server
for _, s := range cfg.Servers {
s.Prefix = strings.TrimRight(s.Prefix, "/")
ys, err := yggdrasil.NewServer(s.Prefix, yggdrasil.NewServerOptions{
Name: s.Name,
Proxy: s.Proxy,
})
if err != nil {
return nil, fmt.Errorf("parse server `%v`: %w", s.Name, err)
}
servers = append(servers, ys)
}
return servers, nil
}
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