package swap import ( sdk "github.com/cosmos/cosmos-sdk/types" sdkerrors "github.com/cosmos/cosmos-sdk/types/errors" "github.com/kava-labs/kava/x/swap/keeper" "github.com/kava-labs/kava/x/swap/types" ) // NewHandler creates an sdk.Handler for swap messages func NewHandler(k Keeper) sdk.Handler { return func(ctx sdk.Context, msg sdk.Msg) (*sdk.Result, error) { ctx = ctx.WithEventManager(sdk.NewEventManager()) if deadlineMsg, ok := msg.(types.MsgWithDeadline); ok { if deadlineExceeded := deadlineMsg.DeadlineExceeded(ctx.BlockTime()); deadlineExceeded { return nil, sdkerrors.Wrapf(types.ErrDeadlineExceeded, "block time %d >= deadline %d", ctx.BlockTime().Unix(), deadlineMsg.GetDeadline().Unix()) } } switch msg := msg.(type) { case types.MsgDeposit: return handleMsgDeposit(ctx, k, msg) case types.MsgWithdraw: return handleMsgWithdraw(ctx, k, msg) case types.MsgSwapExactForTokens: return handleMsgSwapExactForTokens(ctx, k, msg) case types.MsgSwapForExactTokens: return handleMsgSwapForExactTokens(ctx, k, msg) default: return nil, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "unrecognized %s message type: %T", ModuleName, msg) } } } func handleMsgDeposit(ctx sdk.Context, k keeper.Keeper, msg types.MsgDeposit) (*sdk.Result, error) { if err := k.Deposit(ctx, msg.Depositor, msg.TokenA, msg.TokenB, msg.Slippage); err != nil { return nil, err } return resultWithMsgSender(ctx, msg.Depositor), nil } func handleMsgWithdraw(ctx sdk.Context, k keeper.Keeper, msg types.MsgWithdraw) (*sdk.Result, error) { if err := k.Withdraw(ctx, msg.From, msg.Shares, msg.MinTokenA, msg.MinTokenB); err != nil { return nil, err } return resultWithMsgSender(ctx, msg.From), nil } func handleMsgSwapExactForTokens(ctx sdk.Context, k keeper.Keeper, msg types.MsgSwapExactForTokens) (*sdk.Result, error) { if err := k.SwapExactForTokens(ctx, msg.Requester, msg.ExactTokenA, msg.TokenB, msg.Slippage); err != nil { return nil, err } return resultWithMsgSender(ctx, msg.Requester), nil } func handleMsgSwapForExactTokens(ctx sdk.Context, k keeper.Keeper, msg types.MsgSwapForExactTokens) (*sdk.Result, error) { if err := k.SwapForExactTokens(ctx, msg.Requester, msg.TokenA, msg.ExactTokenB, msg.Slippage); err != nil { return nil, err } return resultWithMsgSender(ctx, msg.Requester), nil } func resultWithMsgSender(ctx sdk.Context, sender sdk.AccAddress) *sdk.Result { ctx.EventManager().EmitEvent( sdk.NewEvent( sdk.EventTypeMessage, sdk.NewAttribute(sdk.AttributeKeyModule, types.AttributeValueCategory), sdk.NewAttribute(sdk.AttributeKeySender, sender.String()), ), ) return &sdk.Result{ Events: ctx.EventManager().Events(), } }