a7bb9496ae
Vanilla-faithful overworld generator (final_density + multi-noise biomes), full connection lifecycle (status/login/configuration/play), chunk streaming, creative block editing, and the protocol/nbt/registry infrastructure.
60 lines
1.7 KiB
Go
60 lines
1.7 KiB
Go
// Command regionio starts a RegionIO Minecraft server core.
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package main
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import (
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"context"
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"flag"
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"log/slog"
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"os"
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"os/signal"
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"strconv"
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"syscall"
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"regionio/internal/network"
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"regionio/internal/server"
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)
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func main() {
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log := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
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Level: slog.LevelDebug,
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}))
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cfg := server.DefaultConfig()
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// World seed: -seed flag takes precedence, then REGIONIO_SEED env, then the
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// default (0). Accepted formats: decimal, or "0x" hex. An invalid value is
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// fatal — a wrong seed silently generates a different world than intended.
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seedFlag := flag.Int64("seed", parseSeedEnv(os.Getenv("REGIONIO_SEED"), cfg.WorldSeed, log),
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"world seed (overrides REGIONIO_SEED)")
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flag.Parse()
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cfg.WorldSeed = *seedFlag
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log.Info("using world seed", "seed", cfg.WorldSeed)
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srv := server.New(cfg)
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ln := network.NewListener(srv, log)
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// Cancel the context on SIGINT/SIGTERM for a graceful shutdown.
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ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
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defer stop()
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if err := ln.ListenAndServe(ctx); err != nil {
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log.Error("server stopped", "err", err)
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os.Exit(1)
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}
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}
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// parseSeedEnv parses the REGIONIO_SEED env var. It returns fallback when the
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// variable is empty, and logs+returns fallback when parsing fails (so a typo
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// does not silently change the world).
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func parseSeedEnv(raw string, fallback int64, log *slog.Logger) int64 {
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if raw == "" {
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return fallback
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}
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// strconv.ParseInt with base 0 handles decimal and "0x" hex prefixes.
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v, err := strconv.ParseInt(raw, 0, 64)
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if err != nil {
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log.Error("invalid REGIONIO_SEED, falling back to default", "raw", raw, "err", err)
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return fallback
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}
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return v
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}
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