feat: add ranked season maintenance role

server/cmd/maintenance/main.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"context"
+	"database/sql"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/cosmic-clash/cosmic-clash/server/migrations"
+	"github.com/cosmic-clash/cosmic-clash/server/store"
+	_ "github.com/jackc/pgx/v5/stdlib"
+)
+
+func main() {
+	dsn := flag.String("dsn", os.Getenv("COSMIC_CLASH_POSTGRES_DSN"), "PostgreSQL connection string")
+	migrationDir := flag.String("migrations", "migrations", "directory containing numbered SQL migrations")
+	interval := flag.Duration("interval", time.Minute, "maintenance poll interval")
+	batch := flag.Int("batch", 100, "maximum player rollovers per pass")
+	flag.Parse()
+	if *dsn == "" {
+		fatalf("--dsn or COSMIC_CLASH_POSTGRES_DSN is required")
+	}
+	if *interval <= 0 || *batch < 1 || *batch > 1000 {
+		fatalf("invalid interval or batch")
+	}
+	db, err := sql.Open("pgx", *dsn)
+	if err != nil {
+		fatalf("open PostgreSQL: %v", err)
+	}
+	defer db.Close()
+	startupCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+	if err := db.PingContext(startupCtx); err != nil {
+		fatalf("ping PostgreSQL: %v", err)
+	}
+	if err := migrations.Apply(startupCtx, db, *migrationDir); err != nil {
+		fatalf("apply migrations: %v", err)
+	}
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+	for {
+		count, err := store.RolloverDueSeasons(ctx, db, time.Now().UTC(), *batch)
+		if err != nil {
+			fatalf("season maintenance: %v", err)
+		}
+		if count > 0 {
+			log.Printf("applied %d ranked season rollovers", count)
+		}
+		timer := time.NewTimer(*interval)
+		select {
+		case <-ctx.Done():
+			timer.Stop()
+			return
+		case <-timer.C:
+		}
+	}
+}
+
+func fatalf(format string, args ...any) {
+	fmt.Fprintf(os.Stderr, "maintenance: "+format+"\n", args...)
+	os.Exit(1)
+}