69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
package keeper
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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/bank/types"
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)
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// RegisterInvariants registers the bank module invariants
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func RegisterInvariants(ir sdk.InvariantRegistry, k Keeper) {
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ir.RegisterRoute(types.ModuleName, "nonnegative-outstanding", NonnegativeBalanceInvariant(k))
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ir.RegisterRoute(types.ModuleName, "total-supply", TotalSupply(k))
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}
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// AllInvariants runs all invariants of the X/bank module.
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func AllInvariants(k Keeper) sdk.Invariant {
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return func(ctx sdk.Context) (string, bool) {
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return TotalSupply(k)(ctx)
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}
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}
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// NonnegativeBalanceInvariant checks that all accounts in the application have non-negative balances
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func NonnegativeBalanceInvariant(k ViewKeeper) sdk.Invariant {
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return func(ctx sdk.Context) (string, bool) {
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var (
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msg string
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count int
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)
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k.IterateAllBalances(ctx, func(addr sdk.AccAddress, balance sdk.Coin) bool {
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if balance.IsNegative() {
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count++
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msg += fmt.Sprintf("\t%s has a negative balance of %s\n", addr, balance)
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}
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return false
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})
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broken := count != 0
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return sdk.FormatInvariant(
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types.ModuleName, "nonnegative-outstanding",
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fmt.Sprintf("amount of negative balances found %d\n%s", count, msg),
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), broken
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}
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}
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// TotalSupply checks that the total supply reflects all the coins held in accounts
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func TotalSupply(k Keeper) sdk.Invariant {
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return func(ctx sdk.Context) (string, bool) {
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expectedTotal := sdk.Coins{}
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supply := k.GetSupply(ctx)
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k.IterateAllBalances(ctx, func(_ sdk.AccAddress, balance sdk.Coin) bool {
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expectedTotal = expectedTotal.Add(balance)
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return false
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})
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broken := !expectedTotal.IsEqual(supply.GetTotal())
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return sdk.FormatInvariant(types.ModuleName, "total supply",
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fmt.Sprintf(
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"\tsum of accounts coins: %v\n"+
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"\tsupply.Total: %v\n",
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expectedTotal, supply.GetTotal())), broken
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}
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}
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