checker: add a base number for challenges

checker/main.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"flag"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"git.nemunai.re/lectures/adlin/libadlin"
+)
+
+func main() {
+	var dsn = flag.String("dsn", adlin.DSNGenerator(), "DSN to connect to the MySQL server")
+	flag.IntVar(&baseChallenge, "basechallenge", baseChallenge, "Base number for current challenges")
+	flag.Parse()
+
+	// Initialize contents
+	log.Println("Opening database...")
+	if err := adlin.DBInit(*dsn); err != nil {
+		log.Fatal("Cannot open the database: ", err)
+	}
+	defer adlin.DBClose()
+
+	log.Println("Creating database...")
+	if err := adlin.DBCreate(); err != nil {
+		log.Fatal("Cannot create database: ", err)
+	}
+
+	// Prepare graceful shutdown
+	interrupt := make(chan os.Signal, 1)
+	signal.Notify(interrupt, os.Interrupt, syscall.SIGTERM)
+
+	ticker := time.NewTicker(30 * time.Second)
+	defer ticker.Stop()
+
+	// Launch checker
+	for {
+		select {
+		case <-interrupt:
+			break
+		case <-ticker.C:
+			studentsChecker()
+		}
+	}
+
+}