bulletprooftxmanager

package
v0.10.16-rc1 Latest Latest
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 Go to latest Published: May 4, 2022 License: MIT Imports: 37 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	EthTxUnstarted               = EthTxState("unstarted")
	EthTxInProgress              = EthTxState("in_progress")
	EthTxFatalError              = EthTxState("fatal_error")
	EthTxUnconfirmed             = EthTxState("unconfirmed")
	EthTxConfirmed               = EthTxState("confirmed")
	EthTxConfirmedMissingReceipt = EthTxState("confirmed_missing_receipt")

	EthTxAttemptInProgress      = EthTxAttemptState("in_progress")
	EthTxAttemptInsufficientEth = EthTxAttemptState("insufficient_eth")
	EthTxAttemptBroadcast       = EthTxAttemptState("broadcast")
)
View Source 
const InFlightTransactionRecheckInterval = 1 * time.Second

InFlightTransactionRecheckInterval controls how often the EthBroadcaster will poll the unconfirmed queue to see if it is allowed to send another transaction

Variables

View Source 
var (
	// ErrCouldNotGetReceipt is the error string we save if we reach our finality depth for a confirmed transaction without ever getting a receipt
	// This most likely happened because an external wallet used the account for this nonce
	ErrCouldNotGetReceipt = "could not get receipt"
)

Functions

func CheckEthTxQueueCapacity added in v0.10.8 

func CheckEthTxQueueCapacity(db *gorm.DB, fromAddress common.Address, maxQueuedTransactions uint64) (err error)

CheckEthTxQueueCapacity returns an error if inserting this transaction would exceed the maximum queue size.

func CountUnconfirmedTransactions added in v0.10.8 

func CountUnconfirmedTransactions(db *gorm.DB, fromAddress common.Address) (count uint32, err error)

CountUnconfirmedTransactions returns the number of unconfirmed transactions

func CountUnstartedTransactions added in v0.10.11 

func CountUnstartedTransactions(db *gorm.DB, fromAddress common.Address) (count uint32, err error)

CountUnstartedTransactions returns the number of unconfirmed transactions

func GetNextNonce 

func GetNextNonce(db *gorm.DB, address gethCommon.Address) (int64, error)

GetNextNonce returns keys.next_nonce for the given address

func IncrementNextNonce 

func IncrementNextNonce(db *gorm.DB, address gethCommon.Address, currentNonce int64) error

IncrementNextNonce increments keys.next_nonce by 1

Types

type BulletproofTxManager added in v0.10.8 

type BulletproofTxManager struct {
	utils.StartStopOnce
	// contains filtered or unexported fields
}

func NewBulletproofTxManager added in v0.10.8 

func NewBulletproofTxManager(db *gorm.DB, ethClient eth.Client, config Config, keyStore KeyStore, advisoryLocker postgres.AdvisoryLocker, eventBroadcaster postgres.EventBroadcaster) *BulletproofTxManager

func (*BulletproofTxManager) Close added in v0.10.8 

func (b *BulletproofTxManager) Close() (merr error)

func (*BulletproofTxManager) Connect added in v0.10.8 

func (b *BulletproofTxManager) Connect(*models.Head) error

Connect solely exists to conform to HeadTrackable

func (*BulletproofTxManager) CreateEthTransaction added in v0.10.8 

func (b *BulletproofTxManager) CreateEthTransaction(db *gorm.DB, fromAddress, toAddress common.Address, payload []byte, gasLimit uint64, meta interface{}, strategy TxStrategy) (etx EthTx, err error)

CreateEthTransaction inserts a new transaction

func (*BulletproofTxManager) GetGasEstimator added in v0.10.10 

func (b *BulletproofTxManager) GetGasEstimator() gas.Estimator

GetGasEstimator returns the gas estimator, mostly useful for tests

func (*BulletproofTxManager) OnNewLongestChain added in v0.10.8 

func (b *BulletproofTxManager) OnNewLongestChain(ctx context.Context, head models.Head)

OnNewLongestChain conforms to HeadTrackable

func (*BulletproofTxManager) Start added in v0.10.8 

func (b *BulletproofTxManager) Start() (merr error)

func (*BulletproofTxManager) Trigger added in v0.10.8 

func (b *BulletproofTxManager) Trigger(addr common.Address)

Trigger forces the EthBroadcaster to check early for the given address

type Config added in v0.10.8 

type Config interface {
	BlockHistoryEstimatorBatchSize() uint32
	BlockHistoryEstimatorBlockDelay() uint16
	BlockHistoryEstimatorBlockHistorySize() uint16
	BlockHistoryEstimatorTransactionPercentile() uint16
	ChainID() *big.Int
	EthFinalityDepth() uint
	EthGasBumpPercent() uint16
	EthGasBumpThreshold() uint64
	EthGasBumpTxDepth() uint16
	EthGasBumpWei() *big.Int
	EthGasLimitDefault() uint64
	EthGasLimitMultiplier() float32
	EthGasPriceDefault() *big.Int
	EthMaxGasPriceWei() *big.Int
	EthMaxInFlightTransactions() uint32
	EthMaxQueuedTransactions() uint64
	EthMinGasPriceWei() *big.Int
	EthNonceAutoSync() bool
	EthRPCDefaultBatchSize() uint32
	EthTxReaperInterval() time.Duration
	EthTxReaperThreshold() time.Duration
	EthTxResendAfterThreshold() time.Duration
	GasEstimatorMode() string
	TriggerFallbackDBPollInterval() time.Duration
}

Config encompasses config used by bulletprooftxmanager package Unless otherwise specified, these should support changing at runtime

type DropOldestStrategy added in v0.10.9 

type DropOldestStrategy struct {
	// contains filtered or unexported fields
}

DropOldestStrategy will send the newest N transactions, older ones will be removed from the queue

func NewDropOldestStrategy added in v0.10.9 

func NewDropOldestStrategy(subject uuid.UUID, queueSize uint32) DropOldestStrategy

func (DropOldestStrategy) PruneQueue added in v0.10.9 

func (s DropOldestStrategy) PruneQueue(tx *gorm.DB) (n int64, err error)

func (DropOldestStrategy) Subject added in v0.10.9 

func (s DropOldestStrategy) Subject() uuid.NullUUID

type EthBroadcaster 

type EthBroadcaster struct {
	utils.StartStopOnce
	// contains filtered or unexported fields
}

EthBroadcaster monitors eth_txes for transactions that need to be broadcast, assigns nonces and ensures that at least one eth node somewhere has received the transaction successfully.

This does not guarantee delivery! A whole host of other things can subsequently go wrong such as transactions being evicted from the mempool, eth nodes going offline etc. Responsibility for ensuring eventual inclusion into the chain falls on the shoulders of the ethConfirmer.

What EthBroadcaster does guarantee is: - a monotonic series of increasing nonces for eth_txes that can all eventually be confirmed if you retry enough times - transition of eth_txes out of unstarted into either fatal_error or unconfirmed - existence of a saved eth_tx_attempt

func NewEthBroadcaster 

func NewEthBroadcaster(db *gorm.DB, ethClient eth.Client, config Config, keystore KeyStore, advisoryLocker postgres.AdvisoryLocker, eventBroadcaster postgres.EventBroadcaster, allKeys []ethkey.Key, estimator gas.Estimator) *EthBroadcaster

NewEthBroadcaster returns a new concrete EthBroadcaster

func (*EthBroadcaster) Close added in v0.10.3 

func (eb *EthBroadcaster) Close() error

func (*EthBroadcaster) ProcessUnstartedEthTxs 

func (eb *EthBroadcaster) ProcessUnstartedEthTxs(key ethkey.Key) error

func (*EthBroadcaster) Start 

func (eb *EthBroadcaster) Start() error

func (*EthBroadcaster) Trigger 

func (eb *EthBroadcaster) Trigger(addr gethCommon.Address)

Trigger forces the monitor for a particular address to recheck for new eth_txes Logs error and does nothing if address was not registered on startup

type EthConfirmer 

type EthConfirmer struct {
	utils.StartStopOnce
	// contains filtered or unexported fields
}

func NewEthConfirmer 

func NewEthConfirmer(db *gorm.DB, ethClient eth.Client, config Config, keystore KeyStore, advisoryLocker postgres.AdvisoryLocker, keys []ethkey.Key, estimator gas.Estimator) *EthConfirmer

NewEthConfirmer instantiates a new eth confirmer

func (*EthConfirmer) CheckForReceipts added in v0.10.8 

func (ec *EthConfirmer) CheckForReceipts(ctx context.Context, blockNum int64) error

func (*EthConfirmer) Close added in v0.10.8 

func (ec *EthConfirmer) Close() error

func (*EthConfirmer) EnsureConfirmedTransactionsInLongestChain added in v0.10.8 

func (ec *EthConfirmer) EnsureConfirmedTransactionsInLongestChain(ctx context.Context, head models.Head) error

EnsureConfirmedTransactionsInLongestChain finds all confirmed eth_txes up to the depth of the given chain and ensures that every one has a receipt with a block hash that is in the given chain.

If any of the confirmed transactions does not have a receipt in the chain, it has been re-org'd out and will be rebroadcast.

func (*EthConfirmer) ForceRebroadcast added in v0.10.8 

func (ec *EthConfirmer) ForceRebroadcast(beginningNonce uint, endingNonce uint, gasPriceWei uint64, address gethCommon.Address, overrideGasLimit uint64) error

ForceRebroadcast sends a transaction for every nonce in the given nonce range at the given gas price. If an eth_tx exists for this nonce, we re-send the existing eth_tx with the supplied parameters. If an eth_tx doesn't exist for this nonce, we send a zero transaction. This operates completely orthogonal to the normal EthConfirmer and can result in untracked attempts! Only for emergency usage. Deliberately does not take the advisory lock (we don't write to the database so this is safe from a data integrity perspective). This is in case of some unforeseen scenario where the node is refusing to release the lock. KISS.

func (*EthConfirmer) ProcessHead added in v0.10.8 

func (ec *EthConfirmer) ProcessHead(ctx context.Context, head models.Head) error

ProcessHead takes all required transactions for the confirmer on a new head

func (*EthConfirmer) RebroadcastWhereNecessary added in v0.10.8 

func (ec *EthConfirmer) RebroadcastWhereNecessary(ctx context.Context, blockHeight int64) error

func (*EthConfirmer) SetBroadcastBeforeBlockNum added in v0.10.8 

func (ec *EthConfirmer) SetBroadcastBeforeBlockNum(blockNum int64) error

SetBroadcastBeforeBlockNum updates already broadcast attempts with the current block number. This is safe no matter how old the head is because if the attempt is already broadcast it _must_ have been before this head.

func (*EthConfirmer) Start added in v0.10.8 

func (ec *EthConfirmer) Start() error

type EthReceipt added in v0.10.10 

type EthReceipt struct {
	ID               int64
	TxHash           common.Hash
	BlockHash        common.Hash
	BlockNumber      int64
	TransactionIndex uint
	Receipt          []byte
	CreatedAt        time.Time
}

type EthResender added in v0.10.4 

type EthResender struct {
	// contains filtered or unexported fields
}

EthResender periodically picks up transactions that have been languishing unconfirmed for a configured amount of time without being sent, and sends their highest priced attempt again. This helps to defend against geth/parity silently dropping txes, or txes being ejected from the mempool.

Previously we relied on the bumper to do this for us implicitly but there can occasionally be problems with this (e.g. abnormally long block times, or if gas bumping is disabled)

func NewEthResender added in v0.10.4 

func NewEthResender(db *gorm.DB, ethClient eth.Client, pollInterval time.Duration, config Config) *EthResender

func (*EthResender) Start added in v0.10.4 

func (er *EthResender) Start()

func (*EthResender) Stop added in v0.10.4 

func (er *EthResender) Stop()

type EthTaskRunTx added in v0.10.10 

type EthTaskRunTx struct {
	TaskRunID uuid.UUID
	EthTxID   int64
	EthTx     EthTx
}

type EthTx added in v0.10.10 

type EthTx struct {
	ID             int64
	Nonce          *int64
	FromAddress    common.Address
	ToAddress      common.Address
	EncodedPayload []byte
	Value          assets.Eth
	// GasLimit on the EthTx is always the conceptual gas limit, which is not
	// necessarily the same as the on-chain encoded value (i.e. Optimism)
	GasLimit uint64
	Error    null.String
	// BroadcastAt is updated every time an attempt for this eth_tx is re-sent
	// In almost all cases it will be within a second or so of the actual send time.
	BroadcastAt   *time.Time
	CreatedAt     time.Time
	State         EthTxState
	EthTxAttempts []EthTxAttempt `gorm:"->"`
	// Marshalled EthTxMeta
	// Used for additional context around transactions which you want to log
	// at send time.
	Meta    datatypes.JSON
	Subject uuid.NullUUID
}

func FindEthTxsRequiringGasBump added in v0.10.0 

func FindEthTxsRequiringGasBump(db *gorm.DB, address gethCommon.Address, blockNum, gasBumpThreshold, depth int64) (etxs []EthTx, err error)

FindEthTxsRequiringGasBump returns transactions that have all attempts which are unconfirmed for at least gasBumpThreshold blocks, limited by limit pending transactions

It also returns eth_txes that are unconfirmed with no eth_tx_attempts

func FindEthTxsRequiringRebroadcast added in v0.10.0 

func FindEthTxsRequiringRebroadcast(db *gorm.DB, address gethCommon.Address, blockNum, gasBumpThreshold, bumpDepth int64, maxInFlightTransactions uint32) (etxs []EthTx, err error)

FindEthTxsRequiringRebroadcast returns attempts that hit insufficient eth, and attempts that need bumping, in nonce ASC order

func FindEthTxsRequiringResubmissionDueToInsufficientEth added in v0.10.0 

func FindEthTxsRequiringResubmissionDueToInsufficientEth(db *gorm.DB, address gethCommon.Address) (etxs []EthTx, err error)

FindEthTxsRequiringResubmissionDueToInsufficientEth returns transactions that need to be re-sent because they hit an out-of-eth error on a previous block

func SendEther added in v0.8.8 

func SendEther(db *gorm.DB, from, to common.Address, value assets.Eth, gasLimit uint64) (etx EthTx, err error)

SendEther creates a transaction that transfers the given value of ether

func (EthTx) GetError added in v0.10.10 

func (e EthTx) GetError() error

func (EthTx) GetID added in v0.10.10 

func (e EthTx) GetID() string

GetID allows EthTx to be used as jsonapi.MarshalIdentifier

type EthTxAttempt added in v0.10.10 

type EthTxAttempt struct {
	ID       int64
	EthTxID  int64
	EthTx    EthTx `gorm:"foreignkey:EthTxID;->"`
	GasPrice utils.Big
	// ChainSpecificGasLimit on the EthTxAttempt is always the same as the on-chain encoded value for gas limit
	ChainSpecificGasLimit   uint64
	SignedRawTx             []byte
	Hash                    common.Hash
	CreatedAt               time.Time
	BroadcastBeforeBlockNum *int64
	State                   EthTxAttemptState
	EthReceipts             []EthReceipt `gorm:"foreignKey:TxHash;references:Hash;association_foreignkey:Hash;->"`
}

func FindEthTxesRequiringResend added in v0.10.4 

func FindEthTxesRequiringResend(db *gorm.DB, olderThan time.Time, maxInFlightTransactions uint32) (attempts []EthTxAttempt, err error)

FindEthTxesRequiringResend returns the highest priced attempt for each eth_tx that was last sent before or at the given time (up to limit)

func (EthTxAttempt) GetSignedTx added in v0.10.10 

func (a EthTxAttempt) GetSignedTx() (*types.Transaction, error)

GetSignedTx decodes the SignedRawTx into a types.Transaction struct

type EthTxAttemptState added in v0.10.10 

type EthTxAttemptState string

type EthTxState added in v0.10.10 

type EthTxState string

type KeyStore added in v0.10.8 

type KeyStore interface {
	AllKeys() (keys []ethkey.Key, err error)
	SignTx(fromAddress common.Address, tx *gethTypes.Transaction, chainID *big.Int) (*gethTypes.Transaction, error)
	SubscribeToKeyChanges() (ch chan struct{}, unsub func())
}

KeyStore encompasses the subset of keystore used by bulletprooftxmanager

type Log added in v0.10.0 

type Log struct {
	Address     common.Address `json:"address"`
	Topics      []common.Hash  `json:"topics"`
	Data        []byte         `json:"data"`
	BlockNumber uint64         `json:"blockNumber"`
	TxHash      common.Hash    `json:"transactionHash"`
	TxIndex     uint           `json:"transactionIndex"`
	BlockHash   common.Hash    `json:"blockHash"`
	Index       uint           `json:"logIndex"`
	Removed     bool           `json:"removed"`
}

Log represents a contract log event.

Copied from go-ethereum: https://github.com/ethereum/go-ethereum/blob/ce9a289fa48e0d2593c4aaa7e207c8a5dd3eaa8a/core/types/log.go

We use our own version because Geth's version specifies various gencodec:"required" fields which cause unhelpful errors when unmarshalling from an empty JSON object which can happen in the batch fetcher.

func FromGethLog added in v0.10.0 

func FromGethLog(gl *gethTypes.Log) *Log

FromGethLog converts a gethTypes.Log to a Log

func (Log) MarshalJSON added in v0.10.0 

func (l Log) MarshalJSON() ([]byte, error)

MarshalJSON marshals as JSON.

func (*Log) UnmarshalJSON added in v0.10.0 

func (l *Log) UnmarshalJSON(input []byte) error

UnmarshalJSON unmarshals from JSON.

type NSinserttx added in v0.10.4 

type NSinserttx struct {
	Etx     EthTx
	Attempt EthTxAttempt
}

NSinserttx represents an EthTx and Attempt to be inserted together

type NonceSyncer added in v0.10.4 

type NonceSyncer struct {
	// contains filtered or unexported fields
}

NonceSyncer manages the delicate task of syncing the local nonce with the chain nonce in case of divergence.

On startup, we check each key for the nonce value on chain and compare it to our local value.

Usually the on-chain nonce will be the same as (or lower than) the next_nonce in the DB, in which case we do nothing.

If we are restoring from a backup however, or another wallet has used the account, the chain nonce might be higher than our local one. In this scenario, we must fastforward the local nonce to match the chain nonce.

The problem with doing this is that now Chainlink does not have any ownership or control over potentially pending transactions with nonces between our local highest nonce and the chain nonce. If one of those transactions is pushed out of the mempool or re-org'd out of the chain, we run the risk of being stuck with a gap in the nonce sequence that will never be filled.

The solution is to query the chain for our own transactions and take ownership of them by writing them to the database and letting the EthConfirmer handle them as it would any other transaction.

This is not quite as straightforward as one might expect. We cannot query transactions from our account to infinite depth (geth does not support this). The best we can do is to query for all transactions sent within the past ETH_FINALITY_DEPTH blocks and find the ones sent by our address(es).

This gives us re-org protection up to ETH_FINALITY_DEPTH deep in the worst case, which is in line with our other guarantees.

func NewNonceSyncer added in v0.10.4 

func NewNonceSyncer(db *gorm.DB, ethClient eth.Client) *NonceSyncer

NewNonceSyncer returns a new syncer

func (NonceSyncer) SyncAll added in v0.10.4 

func (s NonceSyncer) SyncAll(ctx context.Context, keys []ethkey.Key) (merr error)

SyncAll syncs nonces for all keys in parallel

This should only be called once, before the EthBroadcaster has started. Calling it later is not safe and could lead to races.

type NullTxManager added in v0.10.8 

type NullTxManager struct {
	ErrMsg string
}

func (*NullTxManager) Close added in v0.10.8 

func (n *NullTxManager) Close() error

func (*NullTxManager) Connect added in v0.10.8 

func (n *NullTxManager) Connect(*models.Head) error

func (*NullTxManager) CreateEthTransaction added in v0.10.8 

func (n *NullTxManager) CreateEthTransaction(*gorm.DB, common.Address, common.Address, []byte, uint64, interface{}, TxStrategy) (etx EthTx, err error)

func (*NullTxManager) GetGasEstimator added in v0.10.10 

func (n *NullTxManager) GetGasEstimator() gas.Estimator

func (*NullTxManager) Healthy added in v0.10.8 

func (n *NullTxManager) Healthy() error

func (*NullTxManager) OnNewLongestChain added in v0.10.8 

func (n *NullTxManager) OnNewLongestChain(context.Context, models.Head)

func (*NullTxManager) Ready added in v0.10.8 

func (n *NullTxManager) Ready() error

func (*NullTxManager) Start added in v0.10.8 

func (n *NullTxManager) Start() error

func (*NullTxManager) Trigger added in v0.10.8 

func (n *NullTxManager) Trigger(common.Address)

type Reaper added in v0.10.7 

type Reaper struct {
	// contains filtered or unexported fields
}

Reaper handles periodic database cleanup for BPTXM

func NewReaper added in v0.10.7 

func NewReaper(db *gorm.DB, config ReaperConfig) *Reaper

NewReaper instantiates a new reaper object

func (*Reaper) ReapEthTxes added in v0.10.7 

func (r *Reaper) ReapEthTxes(headNum int64) error

ReapEthTxes deletes old eth_txes

func (*Reaper) ReapJobRuns added in v0.10.8 

func (r *Reaper) ReapJobRuns() error

ReapJobRuns removes old job runs HACK: This isn't quite the right place for it, but since we are killing the old pipeline this code is temporary anyway

func (*Reaper) SetLatestBlockNum added in v0.10.7 

func (r *Reaper) SetLatestBlockNum(latestBlockNum int64)

SetLatestBlockNum should be called on every new highest block number

func (*Reaper) Start added in v0.10.7 

func (r *Reaper) Start()

Start the reaper. Should only be called once.

func (*Reaper) Stop added in v0.10.7 

func (r *Reaper) Stop()

Stop the reaper. Should only be called once.

type ReaperConfig added in v0.10.7 

type ReaperConfig interface {
	EthTxReaperInterval() time.Duration
	EthTxReaperThreshold() time.Duration
	EthFinalityDepth() uint
}

ReaperConfig is the config subset used by the reaper

type Receipt added in v0.10.0 

type Receipt struct {
	PostState         []byte          `json:"root"`
	Status            uint64          `json:"status"`
	CumulativeGasUsed uint64          `json:"cumulativeGasUsed"`
	Bloom             gethTypes.Bloom `json:"logsBloom"`
	Logs              []*Log          `json:"logs"`
	TxHash            common.Hash     `json:"transactionHash"`
	ContractAddress   common.Address  `json:"contractAddress"`
	GasUsed           uint64          `json:"gasUsed"`
	BlockHash         common.Hash     `json:"blockHash,omitempty"`
	BlockNumber       *big.Int        `json:"blockNumber,omitempty"`
	TransactionIndex  uint            `json:"transactionIndex"`
}

Receipt represents an ethereum receipt.

Copied from go-ethereum: https://github.com/ethereum/go-ethereum/blob/ce9a289fa48e0d2593c4aaa7e207c8a5dd3eaa8a/core/types/receipt.go#L50

We use our own version because Geth's version specifies various gencodec:"required" fields which cause unhelpful errors when unmarshalling from an empty JSON object which can happen in the batch fetcher.

func FromGethReceipt added in v0.10.0 

func FromGethReceipt(gr *gethTypes.Receipt) *Receipt

FromGethReceipt converts a gethTypes.Receipt to a Receipt

func (Receipt) IsUnmined added in v0.10.0 

func (r Receipt) IsUnmined() bool

IsUnmined returns true if the receipt is for a TX that has not been mined yet. Supposedly according to the spec this should never happen, but Parity does it anyway.

func (Receipt) IsZero added in v0.10.0 

func (r Receipt) IsZero() bool

IsZero returns true if receipt is the zero receipt Batch calls to the RPC will return a pointer to an empty Receipt struct Easiest way to check if the receipt was missing is to see if the hash is 0x0 Real receipts will always have the TxHash set

func (Receipt) MarshalJSON added in v0.10.0 

func (r Receipt) MarshalJSON() ([]byte, error)

MarshalJSON marshals Receipt as JSON. Copied from: https://github.com/ethereum/go-ethereum/blob/ce9a289fa48e0d2593c4aaa7e207c8a5dd3eaa8a/core/types/gen_receipt_json.go

func (*Receipt) UnmarshalJSON added in v0.10.0 

func (r *Receipt) UnmarshalJSON(input []byte) error

UnmarshalJSON unmarshals from JSON.

type SendEveryStrategy added in v0.10.9 

type SendEveryStrategy struct{}

SendEveryStrategy will always send the tx

func (SendEveryStrategy) PruneQueue added in v0.10.9 

func (SendEveryStrategy) PruneQueue(*gorm.DB) (int64, error)

func (SendEveryStrategy) Subject added in v0.10.9 

func (SendEveryStrategy) Subject() uuid.NullUUID

type TxManager added in v0.10.8 

type TxManager interface {
	httypes.HeadTrackable
	service.Service
	Trigger(addr common.Address)
	CreateEthTransaction(db *gorm.DB, fromAddress, toAddress common.Address, payload []byte, gasLimit uint64, meta interface{}, strategy TxStrategy) (etx EthTx, err error)
	GetGasEstimator() gas.Estimator
}

type TxStrategy added in v0.10.9 

type TxStrategy interface {
	// Subject will be saved to eth_txes.subject if not null
	Subject() uuid.NullUUID
	// PruneQueue is called after eth_tx insertion
	PruneQueue(tx *gorm.DB) (n int64, err error)
}

TxStrategy controls how txes are queued and sent

func NewQueueingTxStrategy added in v0.10.9 

func NewQueueingTxStrategy(subject uuid.UUID, queueSize uint32) (strategy TxStrategy)

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