Added a template for game frontend

om-agones-game-frontend-example/main.go

@@ -0,0 +1,74 @@
+package gamefrontend
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"google.golang.org/grpc"
+	"open-match.dev/open-match/pkg/pb"
+)
+
+func createOMFrontendClient() (pb.FrontendClient, func() error) {
+	conn, err := grpc.Dial("om-frontend.open-match.svc.cluster.local:50504", grpc.WithInsecure())
+	if err != nil {
+		panic(err)
+	}
+	return pb.NewFrontendClient(conn), conn.Close
+}
+
+func createOMTicket() *pb.Ticket {
+	return &pb.Ticket{
+		SearchFields: &pb.SearchFields{
+			DoubleArgs: map[string]float64{"defense": 10, "attack": 20, "level": 50},
+			StringArgs: map[string]string{"guildName": "open-match", "location": "alterac"},
+			Tags:       []string{"beta-gameplay", "demo-map"},
+		},
+	}
+}
+
+// doGameQueue accepts a channel that represents status of a player in the queue.
+// An openned channel means the player is actively seeking for a game match, while
+// a closed channel means the player exited the game queue.
+func doGameQueue(c chan bool) {
+	fc, closer := createOMFrontendClient()
+	defer closer()
+
+	resp, err := fc.CreateTicket(context.Background(), &pb.CreateTicketRequest{Ticket: createOMTicket()})
+	if err != nil {
+		panic(err.Error())
+	}
+
+	// Each channel represents a player waiting for a game, the channel will be closed if the player exit the queue
+	tid := resp.GetTicket().GetId()
+	for {
+		// TODO: once we find a game, have the game send something to this channel once the player starts a match making
+		_, ok := <-c
+
+		ticket, err := fc.GetTicket(context.Background(), &pb.GetTicketRequest{TicketId: tid})
+		if err != nil {
+			panic(err.Error())
+		}
+
+		tconn := ticket.GetAssignment().GetConnection()
+		// channel is ok. player is still in the queue and waiting for an assignment.
+		if ok && tconn == "" {
+			// wait for the next check
+			time.Sleep(1 * time.Second)
+			continue
+		}
+
+		// otherwise player is not interested in joining a match anymore, delete the ticket
+		defer fc.DeleteTicket(context.Background(), &pb.DeleteTicketRequest{TicketId: tid})
+		if ok { // player got an assignment,
+			fmt.Printf("a player got assigned to %v\n", tconn)
+		} else if tconn != "" {
+			// player left the queue after getting an assignment, need to recycle the staled game server.
+			// we assume this won't happen in a workshop scenario.
+			fmt.Printf("oops, we got a staled game server\n")
+		} else { // player left the queue without being assign.
+			fmt.Printf("oops, player rage quit after waiting so long\n")
+		}
+		return
+	}
+}