can now only scan once per minute

commands.go

@@ -81,6 +81,11 @@ var scanCommand = &Command{
 	name: "scan",
 	help: "super duper scan",
 	handler: func(conn *Connection, args ...string) {
+		if !conn.CanScan() {
+			fmt.Fprintf(conn, "scanners are still recharging.  Can scan again in %v\n", conn.NextScan())
+			return
+		}
+		conn.RecordScan()
 		system := conn.System()
 		log_info("scan sent from %s", system.name)
 		for id, _ := range index {

session.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net"
 	"strings"
+	"time"
 )
 
 type Connection struct {
@@ -12,6 +13,7 @@ type Connection struct {
 	*bufio.Reader
 	player   *Player
 	location *System
+	lastScan time.Time
 }
 
 func NewConnection(conn net.Conn) *Connection {
@@ -76,3 +78,15 @@ func (c *Connection) PlayerName() string {
 func (c *Connection) InTransit() bool {
 	return c.location == nil
 }
+
+func (c *Connection) RecordScan() {
+	c.lastScan = time.Now()
+}
+
+func (c *Connection) CanScan() bool {
+	return time.Since(c.lastScan) > 1*time.Minute
+}
+
+func (c *Connection) NextScan() time.Duration {
+	return -time.Since(c.lastScan.Add(time.Minute))
+}