0g-chain/internal/x/paychan/handler.go

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package paychan
import (
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sdk "github.com/cosmos/cosmos-sdk/types"
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"reflect"
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)
// NewHandler returns a handler for "paychan" type messages.
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// Called when adding routes to a newly created app.
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func NewHandler(k Keeper) sdk.Handler {
return func(ctx sdk.Context, msg sdk.Msg) sdk.Result {
switch msg := msg.(type) {
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case MsgCreate:
return handleMsgCreate(ctx, k, msg)
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case MsgSubmitUpdate:
return handleMsgSubmitUpdate(ctx, k, msg)
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default:
errMsg := "Unrecognized paychan Msg type: " + reflect.TypeOf(msg).Name()
return sdk.ErrUnknownRequest(errMsg).Result()
}
}
}
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// Handle MsgCreate
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// Leaves validation to the keeper methods.
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func handleMsgCreate(ctx sdk.Context, k Keeper, msg MsgCreate) sdk.Result {
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tags, err := k.CreateChannel(ctx, msg.Participants[0], msg.Participants[len(msg.Participants)-1], msg.Coins)
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if err != nil {
return err.Result()
}
// TODO any other information that should be returned in Result?
return sdk.Result{
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Tags: tags,
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}
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}
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// Handle MsgSubmitUpdate
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// Leaves validation to the keeper methods.
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func handleMsgSubmitUpdate(ctx sdk.Context, k Keeper, msg MsgSubmitUpdate) sdk.Result {
var err sdk.Error
tags := sdk.EmptyTags()
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// TODO refactor signer detection - move to keeper or find nicer setup
channel, _ := k.getChannel(ctx, msg.Update.ChannelID)
participants := channel.Participants
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// if only sender signed
if reflect.DeepEqual(msg.submitter, participants[0]) {
tags, err = k.InitCloseChannelBySender(ctx, msg.Update)
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// else if receiver signed
} else if reflect.DeepEqual(msg.submitter, participants[len(participants)-1]) {
tags, err = k.CloseChannelByReceiver(ctx, msg.Update)
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}
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if err != nil {
return err.Result()
}
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// These tags can be used by clients to subscribe to channel close attempts
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return sdk.Result{
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Tags: tags,
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}
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}