83 lines
2.2 KiB
Go
83 lines
2.2 KiB
Go
package crisis
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import (
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"fmt"
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sdk "github.com/cosmos/cosmos-sdk/types"
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"github.com/cosmos/cosmos-sdk/x/crisis/tags"
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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 = ModuleName
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func NewHandler(k 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 types.MsgVerifyInvariant:
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return handleMsgVerifyInvariant(ctx, msg, k)
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default:
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errMsg := fmt.Sprintf("unrecognized crisis message type: %T", msg)
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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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func handleMsgVerifyInvariant(ctx sdk.Context, msg types.MsgVerifyInvariant, k Keeper) sdk.Result {
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// remove the constant fee
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constantFee := sdk.NewCoins(k.GetConstantFee(ctx))
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_, err := k.bankKeeper.SubtractCoins(ctx, msg.Sender, constantFee)
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if err != nil {
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return err.Result()
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}
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_ = k.feeCollectionKeeper.AddCollectedFees(ctx, constantFee)
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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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var invarianceErr error
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msgFullRoute := msg.FullInvariantRoute()
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for _, invarRoute := range k.routes {
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if invarRoute.FullRoute() == msgFullRoute {
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invarianceErr = 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 types.ErrUnknownInvariant(types.DefaultCodespace).Result()
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}
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if invarianceErr != nil {
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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.DistributeFeePool(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(invarianceErr)
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}
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resTags := sdk.NewTags(
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tags.Sender, msg.Sender.String(),
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tags.Invariant, msg.InvariantRoute,
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)
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return sdk.Result{
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Tags: resTags,
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}
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}
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