69 lines
1.7 KiB
Go
69 lines
1.7 KiB
Go
package base
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import (
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"github.com/tendermint/basecoin"
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"github.com/tendermint/basecoin/stack"
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"github.com/tendermint/basecoin/state"
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)
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//nolint
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const (
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NameChain = "chain"
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)
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// Chain enforces that this tx was bound to the named chain
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type Chain struct {
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stack.PassInitState
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stack.PassInitValidate
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}
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// Name of the module - fulfills Middleware interface
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func (Chain) Name() string {
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return NameChain
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}
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var _ stack.Middleware = Chain{}
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// CheckTx makes sure we are on the proper chain - fulfills Middlware interface
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func (c Chain) CheckTx(ctx basecoin.Context, store state.SimpleDB, tx basecoin.Tx, next basecoin.Checker) (res basecoin.CheckResult, err error) {
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stx, err := c.checkChainTx(ctx.ChainID(), ctx.BlockHeight(), tx)
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if err != nil {
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return res, err
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}
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return next.CheckTx(ctx, store, stx)
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}
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// DeliverTx makes sure we are on the proper chain - fulfills Middlware interface
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func (c Chain) DeliverTx(ctx basecoin.Context, store state.SimpleDB, tx basecoin.Tx, next basecoin.Deliver) (res basecoin.DeliverResult, err error) {
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stx, err := c.checkChainTx(ctx.ChainID(), ctx.BlockHeight(), tx)
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if err != nil {
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return res, err
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}
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return next.DeliverTx(ctx, store, stx)
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}
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// checkChainTx makes sure the tx is a Chain Tx, it is on the proper chain,
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// and it has not expired.
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func (c Chain) checkChainTx(chainID string, height uint64, tx basecoin.Tx) (basecoin.Tx, error) {
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// make sure it is a chaintx
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ctx, ok := tx.Unwrap().(ChainTx)
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if !ok {
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return tx, ErrNoChain()
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}
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// basic validation
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err := ctx.ValidateBasic()
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if err != nil {
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return tx, err
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}
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// compare against state
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if ctx.ChainID != chainID {
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return tx, ErrWrongChain(ctx.ChainID)
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}
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if ctx.ExpiresAt != 0 && ctx.ExpiresAt <= height {
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return tx, ErrExpired()
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}
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return ctx.Tx, nil
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}
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