finished tutorial

x/nameservice/keeper/msg_server_buy_name.go

@@ -1,17 +1,64 @@
+// x/nameservice/keeper/msg_server_buy_name.go
+
 package keeper
 
 import (
 	"context"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
+
 	"nameservice/x/nameservice/types"
 )
 
 func (k msgServer) BuyName(goCtx context.Context, msg *types.MsgBuyName) (*types.MsgBuyNameResponse, error) {
 	ctx := sdk.UnwrapSDKContext(goCtx)
 
-	// TODO: Handling the message
-	_ = ctx
+	// Try getting a name from the store
+	whois, isFound := k.GetWhois(ctx, msg.Name)
+
+	// Set the price at which the name has to be bought if it didn't have an owner before
+	minPrice := sdk.Coins{sdk.NewInt64Coin("token", 10)}
+
+	// Convert price and bid strings to sdk.Coins
+	price, _ := sdk.ParseCoinsNormalized(whois.Price)
+	bid, _ := sdk.ParseCoinsNormalized(msg.Bid)
+
+	// Convert owner and buyer address strings to sdk.AccAddress
+	owner, _ := sdk.AccAddressFromBech32(whois.Owner)
+	buyer, _ := sdk.AccAddressFromBech32(msg.Creator)
+
+	// If a name is found in store
+	if isFound {
+		// If the current price is higher than the bid
+		if price.IsAllGT(bid) {
+			// Throw an error
+			return nil, sdkerrors.Wrap(sdkerrors.ErrInsufficientFunds, "Bid is not high enough")
+		}
+
+		// Otherwise (when the bid is higher), send tokens from the buyer to the owner
+		k.bankKeeper.SendCoins(ctx, buyer, owner, bid)
+	} else { // If the name is not found in the store
+		// If the minimum price is higher than the bid
+		if minPrice.IsAllGT(bid) {
+			// Throw an error
+			return nil, sdkerrors.Wrap(sdkerrors.ErrInsufficientFunds, "Bid is less than min amount")
+		}
+
+		// Otherwise (when the bid is higher), send tokens from the buyer's account to the module's account (as a payment for the name)
+		k.bankKeeper.SendCoinsFromAccountToModule(ctx, buyer, types.ModuleName, bid)
+	}
+
+	// Create an updated whois record
+	newWhois := types.Whois{
+		Index: msg.Name,
+		Name:  msg.Name,
+		Value: whois.Value,
+		Price: bid.String(),
+		Owner: buyer.String(),
+	}
 
+	// Write whois information to the store
+	k.SetWhois(ctx, newWhois)
 	return &types.MsgBuyNameResponse{}, nil
 }

x/nameservice/keeper/msg_server_delete_name.go

@@ -1,17 +1,33 @@
+// x/nameservice/keeper/msg_server_delete_name.go
+
 package keeper
 
 import (
 	"context"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
+
 	"nameservice/x/nameservice/types"
 )
 
 func (k msgServer) DeleteName(goCtx context.Context, msg *types.MsgDeleteName) (*types.MsgDeleteNameResponse, error) {
 	ctx := sdk.UnwrapSDKContext(goCtx)
 
-	// TODO: Handling the message
-	_ = ctx
+	// Try getting name information from the store
+	whois, isFound := k.GetWhois(ctx, msg.Name)
+
+	// If a name is not found, throw an error
+	if !isFound {
+		return nil, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "Name doesn't exist")
+	}
+
+	// If the message sender address doesn't match the name owner, throw an error
+	if !(whois.Owner == msg.Creator) {
+		return nil, sdkerrors.Wrap(sdkerrors.ErrUnauthorized, "Incorrect Owner")
+	}
 
+	// Otherwise, remove the name information from the store
+	k.RemoveWhois(ctx, msg.Name)
 	return &types.MsgDeleteNameResponse{}, nil
 }

x/nameservice/keeper/msg_server_set_name.go

@@ -1,17 +1,37 @@
+// x/nameservice/keeper/msg_server_set_name.go
+
 package keeper
 
 import (
 	"context"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
+
 	"nameservice/x/nameservice/types"
 )
 
 func (k msgServer) SetName(goCtx context.Context, msg *types.MsgSetName) (*types.MsgSetNameResponse, error) {
 	ctx := sdk.UnwrapSDKContext(goCtx)
 
-	// TODO: Handling the message
-	_ = ctx
+	// Try getting name information from the store
+	whois, _ := k.GetWhois(ctx, msg.Name)
+
+	// If the message sender address doesn't match the name owner, throw an error
+	if !(msg.Creator == whois.Owner) {
+		return nil, sdkerrors.Wrap(sdkerrors.ErrUnauthorized, "Incorrect Owner")
+	}
+
+	// Otherwise, create an updated whois record
+	newWhois := types.Whois{
+		Index: msg.Name,
+		Name:  msg.Name,
+		Value: msg.Value,
+		Owner: whois.Owner,
+		Price: whois.Price,
+	}
 
+	// Write whois information to the store
+	k.SetWhois(ctx, newWhois)
 	return &types.MsgSetNameResponse{}, nil
 }

x/nameservice/types/expected_keepers.go

@@ -15,4 +15,6 @@ type AccountKeeper interface {
 type BankKeeper interface {
 	SpendableCoins(ctx sdk.Context, addr sdk.AccAddress) sdk.Coins
 	// Methods imported from bank should be defined here
+	SendCoinsFromAccountToModule(ctx sdk.Context, senderAddr sdk.AccAddress, recipientModule string, amt sdk.Coins) error
+	SendCoins(ctx sdk.Context, fromAddr sdk.AccAddress, toAddr sdk.AccAddress, amt sdk.Coins) error
 }