88 lines
2.5 KiB
Go
88 lines
2.5 KiB
Go
package crisis
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import (
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sdk "github.com/cosmos/cosmos-sdk/types"
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sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
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"github.com/cosmos/cosmos-sdk/x/crisis/keeper"
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"github.com/cosmos/cosmos-sdk/x/crisis/types"
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)
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// RouterKey
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const RouterKey = types.ModuleName
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func NewHandler(k keeper.Keeper) sdk.Handler {
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return func(ctx sdk.Context, msg sdk.Msg) (*sdk.Result, error) {
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ctx = ctx.WithEventManager(sdk.NewEventManager())
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switch msg := msg.(type) {
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case types.MsgVerifyInvariant:
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return handleMsgVerifyInvariant(ctx, msg, k)
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default:
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return nil, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "unrecognized crisis message type: %T", msg)
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}
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}
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}
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func handleMsgVerifyInvariant(ctx sdk.Context, msg types.MsgVerifyInvariant, k keeper.Keeper) (*sdk.Result, error) {
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constantFee := sdk.NewCoins(k.GetConstantFee(ctx))
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if err := k.SendCoinsFromAccountToFeeCollector(ctx, msg.Sender, constantFee); err != nil {
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return nil, err
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}
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// use a cached context to avoid gas costs during invariants
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cacheCtx, _ := ctx.CacheContext()
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found := false
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msgFullRoute := msg.FullInvariantRoute()
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var res string
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var stop bool
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for _, invarRoute := range k.Routes() {
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if invarRoute.FullRoute() == msgFullRoute {
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res, stop = invarRoute.Invar(cacheCtx)
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found = true
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break
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}
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}
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if !found {
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return nil, types.ErrUnknownInvariant
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}
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if stop {
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// NOTE currently, because the chain halts here, this transaction will never be included
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// in the blockchain thus the constant fee will have never been deducted. Thus no
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// refund is required.
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// TODO uncomment the following code block with implementation of the circuit breaker
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//// refund constant fee
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//err := k.distrKeeper.DistributeFromFeePool(ctx, constantFee, msg.Sender)
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//if err != nil {
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//// if there are insufficient coins to refund, log the error,
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//// but still halt the chain.
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//logger := ctx.Logger().With("module", "x/crisis")
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//logger.Error(fmt.Sprintf(
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//"WARNING: insufficient funds to allocate to sender from fee pool, err: %s", err))
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//}
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// TODO replace with circuit breaker
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panic(res)
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}
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ctx.EventManager().EmitEvents(sdk.Events{
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sdk.NewEvent(
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types.EventTypeInvariant,
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sdk.NewAttribute(types.AttributeKeyRoute, msg.InvariantRoute),
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),
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sdk.NewEvent(
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sdk.EventTypeMessage,
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sdk.NewAttribute(sdk.AttributeKeyModule, types.AttributeValueCrisis),
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sdk.NewAttribute(sdk.AttributeKeySender, msg.Sender.String()),
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),
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})
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return &sdk.Result{Events: ctx.EventManager().Events()}, nil
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}
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