Implement server-side movement

server/plugin/control/control.go

@@ -3,6 +3,7 @@ package control
 import (
 	"context"
 	"database/sql"
+	"fmt"
 	"github.com/heroiclabs/nakama-common/runtime"
 	"github.com/josephbmanley/family/server/plugin/entities"
 	"github.com/josephbmanley/family/server/plugin/gamemap"
@@ -17,6 +18,8 @@ type OpCode int64
 const (
 	// OpCodeTileUpdate is used for tile updates
 	OpCodeTileUpdate = 1
+	// OpCodeUpdatePosition is used for player position updates
+	OpCodeUpdatePosition = 2
 )
 
 // Match is the object registered
@@ -32,6 +35,15 @@ type MatchState struct {
 	worldMap  *gamemap.WorldMap
 }
 
+// GetPrecenseList returns an array of current precenes in an array
+func (state *MatchState) GetPrecenseList() []runtime.Presence {
+	precenseList := []runtime.Presence{}
+	for _, precense := range state.presences {
+		precenseList = append(precenseList, precense)
+	}
+	return precenseList
+}
+
 // MatchInit is called when a new match is created
 func (m *Match) MatchInit(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, params map[string]interface{}) (interface{}, int, string) {
 
@@ -81,6 +93,7 @@ func (m *Match) MatchJoin(ctx context.Context, logger runtime.Logger, db *sql.DB
 		player := entities.PlayerEntity{
 			X:        16,
 			Y:        16,
+			Presence: precense,
 		}
 
 		mState.players[precense.GetUserId()] = player
@@ -108,18 +121,32 @@ func (m *Match) MatchLeave(ctx context.Context, logger runtime.Logger, db *sql.D
 	}
 	for _, presence := range presences {
 		delete(mState.presences, presence.GetUserId())
+		delete(mState.players, presence.GetUserId())
 	}
 	return mState
 }
 
 // MatchLoop is code that is executed every tick
 func (m *Match) MatchLoop(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, dispatcher runtime.MatchDispatcher, tick int64, state interface{}, messages []runtime.MatchData) interface{} {
-	// Custom code to:
+	mState, ok := state.(*MatchState)
-	// - Process the messages received.
+	if !ok {
-	// - Update the match state based on the messages and time elapsed.
+		logger.Error("Invalid match state on leave!")
-	// - Broadcast new data messages to match participants.
-
 		return state
+	}
+	for _, message := range messages {
+		if message.GetOpCode() == OpCodeUpdatePosition {
+			player := mState.players[message.GetUserId()]
+
+			if response, err := player.ParsePositionRequest(message.GetData()); err == nil {
+				player.UpdateBasedOnResponse(response)
+				dispatcher.BroadcastMessage(OpCodeUpdatePosition, []byte{}, mState.GetPrecenseList(), player.Presence, false)
+				logger.Info("Yes")
+			} else {
+				logger.Error(fmt.Sprintf("Failed to parse update pos request: %s", err.Error))
+			}
+		}
+	}
+	return mState
 }
 
 // MatchTerminate is code that is executed when the match ends

server/plugin/entities/entities.go

@@ -1,7 +1,55 @@
 package entities
 
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/heroiclabs/nakama-common/runtime"
+	"strconv"
+)
+
 // PlayerEntity is the go struct representing the player's location
 type PlayerEntity struct {
-	X int
+	Presence runtime.Presence
-	Y int
+	X        float64
+	Y        float64
+}
+
+// PlayerPosResponse struct that represents client data
+type PlayerPosResponse struct {
+	X string
+	Y string
+}
+
+// ParsePositionRequest parses data from client
+func (p *PlayerEntity) ParsePositionRequest(data []byte) (PlayerPosResponse, error) {
+	var response PlayerPosResponse
+	err := json.Unmarshal(data, &response)
+	return response, err
+}
+
+//UpdateBasedOnResponse updates the player object based on a response object
+func (p *PlayerEntity) UpdateBasedOnResponse(response PlayerPosResponse) error {
+	if fx, err := strconv.ParseFloat(response.X, 64); err != nil {
+		return err
+	} else {
+		p.X = fx
+		if fy, err := strconv.ParseFloat(response.Y, 64); err != nil {
+			return err
+		} else {
+			p.Y = fy
+		}
+	}
+
+	return nil
+}
+
+// GetPosJSON returns the player's position as a JSON object
+func (p *PlayerEntity) GetPosJSON() ([]byte, error) {
+	playerMap := map[string]string{
+		"player": p.Presence.GetUserId(),
+		"x":      fmt.Sprintf("%f", p.X),
+		"y":      fmt.Sprintf("%f", p.Y),
+	}
+	jsonData, err := json.Marshal(playerMap)
+	return jsonData, err
 }

server/plugin/gamemap/gamemap.go

@@ -27,21 +27,22 @@ func (m WorldMap) GetJSONRegion(startX, endX, startY, endY int) ([]byte, error)
 	for x := startX; x < endX; x++ {
 		regionMap[x] = map[int]int{}
 		for y := startY; y < endY; y++ {
-			if result, err := m.GetTile(x, y); err != nil {
+
-				return nil, err
+			// GetTile and ignore out of bounds errors
-			} else {
+			result, _ := m.GetTile(x, y)
 			regionMap[x][y] = result
 		}
 	}
-	}
 
 	jsonString, err := json.Marshal(regionMap)
 	return jsonString, err
 }
 
 // GetJSONRegionAround returns a JSON object of tile data from a center point
-func (m WorldMap) GetJSONRegionAround(centerX, centerY, regionRadius int) ([]byte, error) {
+func (m WorldMap) GetJSONRegionAround(centerX float64, centerY float64, regionRadius int) ([]byte, error) {
-	jsonString, err := m.GetJSONRegion(centerX-regionRadius, centerX+regionRadius, centerY-regionRadius, centerY+regionRadius)
+	var xCenter int = int(centerX)
+	var yCenter int = int(centerY)
+	jsonString, err := m.GetJSONRegion(xCenter-regionRadius, xCenter+regionRadius, yCenter-regionRadius, yCenter+regionRadius)
 	return jsonString, err
 }