59 lines
1.5 KiB
Go
59 lines
1.5 KiB
Go
package ibc
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import (
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"reflect"
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sdk "github.com/cosmos/cosmos-sdk/types"
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"github.com/cosmos/cosmos-sdk/x/bank"
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)
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func NewHandler(ibcm Mapper, ck bank.Keeper) sdk.Handler {
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return func(ctx sdk.Context, msg sdk.Msg) sdk.Result {
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switch msg := msg.(type) {
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case IBCTransferMsg:
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return handleIBCTransferMsg(ctx, ibcm, ck, msg)
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case IBCReceiveMsg:
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return handleIBCReceiveMsg(ctx, ibcm, ck, msg)
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default:
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errMsg := "Unrecognized IBC Msg type: " + reflect.TypeOf(msg).Name()
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return sdk.ErrUnknownRequest(errMsg).Result()
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}
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}
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}
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// IBCTransferMsg deducts coins from the account and creates an egress IBC packet.
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func handleIBCTransferMsg(ctx sdk.Context, ibcm Mapper, ck bank.Keeper, msg IBCTransferMsg) sdk.Result {
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packet := msg.IBCPacket
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_, err := ck.SubtractCoins(ctx, packet.SrcAddr, packet.Coins)
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if err != nil {
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return err.Result()
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}
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err = ibcm.PostIBCPacket(ctx, packet)
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if err != nil {
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return err.Result()
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}
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return sdk.Result{}
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}
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// IBCReceiveMsg adds coins to the destination address and creates an ingress IBC packet.
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func handleIBCReceiveMsg(ctx sdk.Context, ibcm Mapper, ck bank.Keeper, msg IBCReceiveMsg) sdk.Result {
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packet := msg.IBCPacket
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seq := ibcm.GetIngressSequence(ctx, packet.SrcChain)
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if msg.Sequence != seq {
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return ErrInvalidSequence(ibcm.codespace).Result()
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}
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_, err := ck.AddCoins(ctx, packet.DestAddr, packet.Coins)
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if err != nil {
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return err.Result()
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}
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ibcm.SetIngressSequence(ctx, packet.SrcChain, seq+1)
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return sdk.Result{}
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}
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