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chore: change prepare and process proposal to be NoOps by default #16407

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merged 4 commits into from
Jun 2, 2023
Merged

chore: change prepare and process proposal to be NoOps by default #16407

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20d2913
change prepare and process proposal to be NoOps
tac0turtle Jun 2, 2023
a6e42e6
minor revert
tac0turtle Jun 2, 2023
ceb4958
Update baseapp/abci_utils.go
tac0turtle Jun 2, 2023
8f303c6
Apply suggestions from code review
tac0turtle Jun 2, 2023
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9 changes: 8 additions & 1 deletion baseapp/abci_utils.go
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Original file line number Diff line number Diff line change
Expand Up @@ -179,7 +179,7 @@ func NewDefaultProposalHandler(mp mempool.Mempool, txVerifier ProposalTxVerifier
// FIFO order.
func (h DefaultProposalHandler) PrepareProposalHandler() sdk.PrepareProposalHandler {
return func(ctx sdk.Context, req *abci.RequestPrepareProposal) (*abci.ResponsePrepareProposal, error) {
// If the mempool is nil or a no-op mempool, we simply return the transactions
// If the mempool is nil or NoOp we simply return the transactions
// requested from CometBFT, which, by default, should be in FIFO order.
_, isNoOp := h.mempool.(mempool.NoOpMempool)
if h.mempool == nil || isNoOp {
Expand Down Expand Up @@ -236,6 +236,13 @@ func (h DefaultProposalHandler) PrepareProposalHandler() sdk.PrepareProposalHand
// is used in both steps, and applications must ensure that this is the case in
// non-default handlers.
func (h DefaultProposalHandler) ProcessProposalHandler() sdk.ProcessProposalHandler {
// If the mempool is nil or NoOp we simply return ACCEPT,
// because PrepareProposal may have included txs that could fail verification.
_, isNoOp := h.mempool.(mempool.NoOpMempool)
if h.mempool == nil || isNoOp {
return NoOpProcessProposal()
}

return func(ctx sdk.Context, req *abci.RequestProcessProposal) (*abci.ResponseProcessProposal, error) {
for _, txBytes := range req.Txs {
_, err := h.txVerifier.ProcessProposalVerifyTx(txBytes)
Expand Down
6 changes: 5 additions & 1 deletion docs/docs/building-apps/02-app-mempool.md
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Expand Up @@ -43,7 +43,8 @@ all transactions, it can provide greater control over transaction ordering.
Allowing the application to handle ordering enables the application to define how
it would like the block constructed.

Currently, there is a default `PrepareProposal` implementation provided by the application.
The Cosmos SDK defines the `DefaultProposalHandler` type, which provides applications with
`PrepareProposal` and `ProcessProposal` handlers.

```go reference
https://github.com/cosmos/cosmos-sdk/blob/v0.47.0-rc1/baseapp/baseapp.go#L868-L916
Expand Down Expand Up @@ -116,6 +117,9 @@ A no-op mempool is a mempool where transactions are completely discarded and ign
When this mempool is used, it assumed that an application will rely on CometBFT's transaction ordering defined in `RequestPrepareProposal`,
which is FIFO-ordered by default.

> Note: If a NoOp mempool is used, PrepareProposal and ProcessProposal both should be aware of this as
> PrepareProposal could include transactions that could fail verification in ProcessProposal.

### Sender Nonce Mempool

The nonce mempool is a mempool that keeps transactions from an sorted by nonce in order to avoid the issues with nonces.
Expand Down