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package mempool
import (
"fmt"
abci "github.com/tendermint/tendermint/abci/types"
"github.com/tendermint/tendermint/types"
)
// Mempool defines the mempool interface.
//
// Updates to the mempool need to be synchronized with committing a block so
// apps can reset their transient state on Commit.
type Mempool interface {
// CheckTx executes a new transaction against the application to determine
// its validity and whether it should be added to the mempool.
CheckTx(tx types.Tx, callback func(*abci.Response)) error
// CheckTxWithInfo performs the same operation as CheckTx, but with extra
// meta data about the tx.
// Currently this metadata is the peer who sent it, used to prevent the tx
// from being gossiped back to them.
CheckTxWithInfo(tx types.Tx, callback func(*abci.Response), txInfo TxInfo) error
// ReapMaxBytesMaxGas reaps transactions from the mempool up to maxBytes
// bytes total with the condition that the total gasWanted must be less than
// maxGas.
// If both maxes are negative, there is no cap on the size of all returned
// transactions (~ all available transactions).
ReapMaxBytesMaxGas(maxBytes, maxGas int64) types.Txs
// ReapMaxTxs reaps up to max transactions from the mempool.
// If max is negative, there is no cap on the size of all returned
// transactions (~ all available transactions).
ReapMaxTxs(max int) types.Txs
// Lock locks the mempool. The consensus must be able to hold lock to safely update.
Lock()
// Unlock unlocks the mempool.
Unlock()
// Update informs the mempool that the given txs were committed and can be discarded.
// NOTE: this should be called *after* block is committed by consensus.
// NOTE: unsafe; Lock/Unlock must be managed by caller
Update(blockHeight int64, blockTxs types.Txs, newPreFn PreCheckFunc, newPostFn PostCheckFunc) error
// FlushAppConn flushes the mempool connection to ensure async reqResCb calls are
// done. E.g. from CheckTx.
FlushAppConn() error
// Flush removes all transactions from the mempool and cache
Flush()
// TxsAvailable returns a channel which fires once for every height,
// and only when transactions are available in the mempool.
// NOTE: the returned channel may be nil if EnableTxsAvailable was not called.
TxsAvailable() <-chan struct{}
// EnableTxsAvailable initializes the TxsAvailable channel, ensuring it will
// trigger once every height when transactions are available.
EnableTxsAvailable()
// Size returns the number of transactions in the mempool.
Size() int
// TxsBytes returns the total size of all txs in the mempool.
TxsBytes() int64
// InitWAL creates a directory for the WAL file and opens a file itself.
InitWAL()
// CloseWAL closes and discards the underlying WAL file.
// Any further writes will not be relayed to disk.
CloseWAL()
}
//--------------------------------------------------------------------------------
// PreCheckFunc is an optional filter executed before CheckTx and rejects
// transaction if false is returned. An example would be to ensure that a
// transaction doesn't exceeded the block size.
type PreCheckFunc func(types.Tx) error
// PostCheckFunc is an optional filter executed after CheckTx and rejects
// transaction if false is returned. An example would be to ensure a
// transaction doesn't require more gas than available for the block.
type PostCheckFunc func(types.Tx, *abci.ResponseCheckTx) error
// TxInfo are parameters that get passed when attempting to add a tx to the
// mempool.
type TxInfo struct {
// We don't use p2p.ID here because it's too big. The gain is to store max 2
// bytes with each tx to identify the sender rather than 20 bytes.
SenderID uint16
}
//--------------------------------------------------------------------------------
// PreCheckAminoMaxBytes checks that the size of the transaction plus the amino
// overhead is smaller or equal to the expected maxBytes.
func PreCheckAminoMaxBytes(maxBytes int64) PreCheckFunc {
return func(tx types.Tx) error {
// We have to account for the amino overhead in the tx size as well
// NOTE: fieldNum = 1 as types.Block.Data contains Txs []Tx as first field.
// If this field order ever changes this needs to updated here accordingly.
// NOTE: if some []Tx are encoded without a parenting struct, the
// fieldNum is also equal to 1.
aminoOverhead := types.ComputeAminoOverhead(tx, 1)
txSize := int64(len(tx)) + aminoOverhead
if txSize > maxBytes {
return fmt.Errorf("Tx size (including amino overhead) is too big: %d, max: %d",
txSize, maxBytes)
}
return nil
}
}
// PostCheckMaxGas checks that the wanted gas is smaller or equal to the passed
// maxGas. Returns nil if maxGas is -1.
func PostCheckMaxGas(maxGas int64) PostCheckFunc {
return func(tx types.Tx, res *abci.ResponseCheckTx) error {
if maxGas == -1 {
return nil
}
if res.GasWanted < 0 {
return fmt.Errorf("gas wanted %d is negative",
res.GasWanted)
}
if res.GasWanted > maxGas {
return fmt.Errorf("gas wanted %d is greater than max gas %d",
res.GasWanted, maxGas)
}
return nil
}
}