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| type PurchaseItemPayload struct {
ItemName string `json:"itemName"`
}
func RpcPurchaseItem(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, payload string) (string, error) {
// Get the user ID
userId, ok := ctx.Value(runtime.RUNTIME_CTX_USER_ID).(string)
if !ok {
logger.Error("no user id found")
return "", runtime.NewError("no user id found", 16)
}
// Unmarshal the payload
request := &PurchaseItemPayload{}
if err := json.Unmarshal([]byte(payload), request); err != nil {
logger.Error("error unmarshaling payload", err)
return "", runtime.NewError("purchase item payload invalid", 3)
}
// Make sure the user specified an item to buy
if request.ItemName == "" {
logger.Warn("no item name specified")
return "", runtime.NewError("no item name specified", 3)
}
// Lookup the item prices
readRequest := &runtime.StorageRead{
Collection: "configuration",
Key: "prices",
UserID: "00000000-0000-0000-0000-000000000000",
}
readResult, err := nk.StorageRead(ctx, []*runtime.StorageRead{readRequest})
if err != nil {
logger.Error("error reading item prices from storage", err)
return "", runtime.NewError("error reading item prices from storage", 13)
}
if len(readResult) == 0 {
logger.Warn("no item prices in storage")
return "", runtime.NewError("no item prices in storage", 13)
}
// Check if there is a price for the requested item
var prices map[string]int
if err := json.Unmarshal([]byte(readResult[0].Value), &prices); err != nil {
logger.Error("error unmarshaling prices", err)
return "", runtime.NewError("error unmarshaling prices", 13)
}
if _, ok := prices[request.ItemName]; !ok {
logger.Warn("no price available for %s", request.ItemName)
return "", runtime.NewError(fmt.Sprintf("no price available for %s", request.ItemName), 5)
}
// Check that the player has enough coins to spend
account, err := nk.AccountGetId(ctx, userId)
if err != nil {
logger.Error("error getting account data", err)
return "", runtime.NewError("error getting account data", 13)
}
var wallet map[string]int
if err := json.Unmarshal([]byte(account.Wallet), &wallet); err != nil {
logger.Error("error unmarshaling wallet", err)
return "", runtime.NewError("error unmarshaling wallet", 13)
}
if wallet["coins"] < prices[request.ItemName] {
logger.Warn("not enough coins to purchase item")
return "", runtime.NewError("not enough coins to purchase item", 9)
}
// Decrease the player's coins
_, _, err = nk.WalletUpdate(ctx, userId, map[string]int64{"coins": int64(-prices[request.ItemName])}, nil, true)
if err != nil {
logger.Error("unable to update wallet", err)
return "", runtime.NewError("unable to update wallet", 13)
}
// Get the player's current inventory
var inventory map[string]int
readRequest = &runtime.StorageRead{
Collection: "economy",
Key: "inventory",
UserID: userId,
}
readResult, err = nk.StorageRead(ctx, []*runtime.StorageRead{readRequest})
if err != nil {
logger.Error("error reading inventory from storage", err)
return "", runtime.NewError("error reading inventory from storage", 13)
}
if len(readResult) > 0 {
if err := json.Unmarshal([]byte(readResult[0].Value), &inventory); err != nil {
logger.Error("error unmarshaling inventory", err)
return "", runtime.NewError("error unmarshaling inventory", 13)
}
} else {
inventory = make(map[string]int)
}
// Give the player the item (either increase quantity if they already possessed it or add one)
if _, ok := inventory[request.ItemName]; ok {
inventory[request.ItemName] += 1
} else {
inventory[request.ItemName] = 1
}
// Write the updated inventory to storage
inventoryJson, err := json.Marshal(inventory)
if err != nil {
logger.Error("error marshaling inventory")
return "", runtime.NewError("error marshaling inventory", 13)
}
writeRequest := &runtime.StorageWrite{
Collection: "economy",
Key: "inventory",
UserID: userId,
PermissionRead: 1,
PermissionWrite: 1,
Value: string(inventoryJson),
}
// Return an error if the write does not succeed
storageWriteAck, err := nk.StorageWrite(ctx, []*runtime.StorageWrite{writeRequest})
if err != nil || len(storageWriteAck) == 0 {
logger.Error("error saving inventory")
return "", runtime.NewError("error saving inventory", 13)
}
return "{}", nil
}
|
