86 lines
2.9 KiB
Go
86 lines
2.9 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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"time"
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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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port := flag.Int("port", cfg.Port, "TCP listen port")
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worldDir := flag.String("world", cfg.WorldDir, "world directory (empty = in-memory only)")
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maxCache := flag.Int("maxcache", cfg.MaxCachedChunks, "max cached chunks, LRU eviction (0 = unbounded)")
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viewDistance := flag.Int("viewdistance", cfg.MaxViewDistance, "maximum client chunk view radius (2-16)")
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flag.Parse()
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cfg.WorldSeed = *seedFlag
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cfg.Port = *port
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cfg.WorldDir = *worldDir
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cfg.MaxCachedChunks = *maxCache
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cfg.MaxViewDistance = *viewDistance
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log.Info("using world seed", "seed", cfg.WorldSeed, "worldDir", cfg.WorldDir,
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"maxcache", cfg.MaxCachedChunks, "viewdistance", cfg.MaxViewDistance)
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srv, err := server.New(cfg)
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if err != nil {
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log.Error("failed to create server", "err", err)
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os.Exit(1)
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}
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// Start the chunk autosave loop. It flushes dirty chunks every 30s and does
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// a final SaveAll when the context (cancelled by signal) ends.
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saveCtx, saveStop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
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autosaveDone := srv.Chunks().StartAutosave(saveCtx, log, 30*time.Second)
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srv.StartSpawning(saveCtx)
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ln := network.NewListener(srv, log)
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// ListenAndServe blocks until the listener stops (on the same signals).
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// The autosave context is separate so the final flush runs after the
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// listener exits; stop it here to trigger that final SaveAll, then wait for
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// the saver to finish before releasing the store file handles.
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if err := ln.ListenAndServe(saveCtx); err != nil {
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log.Error("server stopped", "err", err)
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}
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saveStop()
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<-autosaveDone
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if srv.Store() != nil {
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srv.Store().Close()
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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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