logpoller

package
v2.1.0-mercury-20230509 Latest Latest
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 Go to latest Published: May 9, 2023 License: MIT Imports: 25 Imported by: 2

Documentation

Overview

Package logpoller is a service for querying EVM log data.

It can be thought of as a more performant and sophisticated version of eth_getLogs https://ethereum.org/en/developers/docs/apis/json-rpc/#eth_getlogs. Having a local table of relevant, continually canonical logs allows us to 2 main advantages:

  • Have hundreds of jobs/clients querying for logs without overloading the underlying RPC provider.
  • Do more sophisticated querying (filter by confirmations/time/log contents, efficiently join between the logs table and other tables on the node, etc.)

Guarantees provided by the poller:

  • Queries always return the logs from the _current_ canonical chain (same as eth_getLogs). In particular that means that querying unfinalized logs may change between queries but finalized logs remain stable. The threshold between unfinalized and finalized logs is the finalityDepth parameter, chosen such that with exceedingly high probability logs finalityDepth deep cannot be reorged.
  • After calling RegisterFilter with a particular event, it will never miss logs for that event despite node crashes and reorgs. The granularity of the filter is always at least one block (more when backfilling).
  • Old logs stored in the db will only be deleted if all filters matching them have explicit retention periods set, and all of them have expired. Default retention of 0 on any matching filter guarantees permanent retention.
  • After calling Replay(fromBlock), all blocks including that one to the latest chain tip will be polled with the current filter. This can be used on first time job add to specify a start block from which you wish to capture existing logs.

Index

Constants

This section is empty.

Variables

View Source 
var (
	ErrReplayRequestAborted = errors.New("aborted, replay request cancelled")
	ErrReplayInProgress     = errors.New("replay request cancelled, but replay is already in progress")
	ErrLogPollerShutdown    = errors.New("replay aborted due to log poller shutdown")
)

Functions

func EvmWord 

func EvmWord(i uint64) common.Hash

func FilterName 

func FilterName(id string, args ...any) string

FilterName is a suggested convenience function for clients to construct unique filter names to populate Name field of struct Filter

func NewLogPoller 

func NewLogPoller(orm *ORM, ec Client, lggr logger.Logger, pollPeriod time.Duration,
	finalityDepth int64, backfillBatchSize int64, rpcBatchSize int64, keepBlocksDepth int64) *logPoller

NewLogPoller creates a log poller. Note there is an assumption that blocks can be processed faster than they are produced for the given chain, or the poller will fall behind. Block processing involves the following calls in steady state (without reorgs):

  • eth_getBlockByNumber - headers only (transaction hashes, not full transaction objects),
  • eth_getLogs - get the logs for the block
  • 1 db read latest block - for checking reorgs
  • 1 db tx including block write and logs write to logs.

How fast that can be done depends largely on network speed and DB, but even for the fastest support chain, polygon, which has 2s block times, we need RPCs roughly with <= 500ms latency

Types

type Client 

type Client interface {
	HeadByNumber(ctx context.Context, n *big.Int) (*evmtypes.Head, error)
	HeadByHash(ctx context.Context, n common.Hash) (*evmtypes.Head, error)
	BatchCallContext(ctx context.Context, b []rpc.BatchElem) error
	FilterLogs(ctx context.Context, q ethereum.FilterQuery) ([]types.Log, error)
	ConfiguredChainID() *big.Int
}

type Exp added in v2.2.0 

type Exp struct {
	Address      common.Address
	EventSig     common.Hash
	Expiration   time.Time
	TimeNow      time.Time
	ShouldDelete bool
}

type Filter 

type Filter struct {
	Name      string // see FilterName(id, args) below
	EventSigs evmtypes.HashArray
	Addresses evmtypes.AddressArray
	Retention time.Duration
}

func (*Filter) Contains 

func (filter *Filter) Contains(other *Filter) bool

Contains returns true if this filter already fully Contains a filter passed to it.

type Log 

type Log struct {
	EvmChainId     *utils.Big
	LogIndex       int64
	BlockHash      common.Hash
	BlockNumber    int64
	BlockTimestamp time.Time
	Topics         pq.ByteaArray
	EventSig       common.Hash
	Address        common.Address
	TxHash         common.Hash
	Data           []byte
	CreatedAt      time.Time
}

Log represents an EVM log.

func (*Log) GetTopics 

func (l *Log) GetTopics() []common.Hash

func (*Log) ToGethLog 

func (l *Log) ToGethLog() types.Log

type LogPoller 

type LogPoller interface {
	services.ServiceCtx
	Replay(ctx context.Context, fromBlock int64) error
	ReplayAsync(fromBlock int64)
	RegisterFilter(filter Filter) error
	UnregisterFilter(name string, q pg.Queryer) error
	LatestBlock(qopts ...pg.QOpt) (int64, error)
	GetBlocksRange(ctx context.Context, numbers []uint64, qopts ...pg.QOpt) ([]LogPollerBlock, error)

	// General querying
	Logs(start, end int64, eventSig common.Hash, address common.Address, qopts ...pg.QOpt) ([]Log, error)
	LogsWithSigs(start, end int64, eventSigs []common.Hash, address common.Address, qopts ...pg.QOpt) ([]Log, error)
	LatestLogByEventSigWithConfs(eventSig common.Hash, address common.Address, confs int, qopts ...pg.QOpt) (*Log, error)
	LatestLogEventSigsAddrsWithConfs(fromBlock int64, eventSigs []common.Hash, addresses []common.Address, confs int, qopts ...pg.QOpt) ([]Log, error)

	// Content based querying
	IndexedLogs(eventSig common.Hash, address common.Address, topicIndex int, topicValues []common.Hash, confs int, qopts ...pg.QOpt) ([]Log, error)
	IndexedLogsByBlockRange(start, end int64, eventSig common.Hash, address common.Address, topicIndex int, topicValues []common.Hash, qopts ...pg.QOpt) ([]Log, error)
	IndexedLogsTopicGreaterThan(eventSig common.Hash, address common.Address, topicIndex int, topicValueMin common.Hash, confs int, qopts ...pg.QOpt) ([]Log, error)
	IndexedLogsTopicRange(eventSig common.Hash, address common.Address, topicIndex int, topicValueMin common.Hash, topicValueMax common.Hash, confs int, qopts ...pg.QOpt) ([]Log, error)
	IndexedLogsWithSigsExcluding(address common.Address, eventSigA, eventSigB common.Hash, topicIndex int, fromBlock, toBlock int64, confs int, qopts ...pg.QOpt) ([]Log, error)
	LogsDataWordRange(eventSig common.Hash, address common.Address, wordIndex int, wordValueMin, wordValueMax common.Hash, confs int, qopts ...pg.QOpt) ([]Log, error)
	LogsDataWordGreaterThan(eventSig common.Hash, address common.Address, wordIndex int, wordValueMin common.Hash, confs int, qopts ...pg.QOpt) ([]Log, error)
}
var (
	ErrDisabled                 = errors.New("log poller disabled")
	LogPollerDisabled LogPoller = disabled{}
)

type LogPollerBlock 

type LogPollerBlock struct {
	EvmChainId *utils.Big
	BlockHash  common.Hash
	// Note geth uses int64 internally https://github.com/ethereum/go-ethereum/blob/f66f1a16b3c480d3a43ac7e8a09ab3e362e96ae4/eth/filters/api.go#L340
	BlockNumber    int64
	BlockTimestamp time.Time
	CreatedAt      time.Time
}

LogPollerBlock represents an unfinalized block used for reorg detection when polling.

type LogPollerTest 

type LogPollerTest interface {
	LogPoller
	PollAndSaveLogs(ctx context.Context, currentBlockNumber int64)
	BackupPollAndSaveLogs(ctx context.Context, backupPollerBlockDelay int64)
	Filter(from, to *big.Int, bh *common.Hash) ethereum.FilterQuery
	GetReplayFromBlock(ctx context.Context, requested int64) (int64, error)
}

type ORM 

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

func NewORM 

func NewORM(chainID *big.Int, db *sqlx.DB, lggr logger.Logger, cfg pg.QConfig) *ORM

NewORM creates an ORM scoped to chainID.

func (*ORM) DeleteBlocksAfter 

func (o *ORM) DeleteBlocksAfter(start int64, qopts ...pg.QOpt) error

DeleteBlocksAfter delete all blocks after and including start.

func (*ORM) DeleteBlocksBefore 

func (o *ORM) DeleteBlocksBefore(end int64, qopts ...pg.QOpt) error

DeleteBlocksBefore delete all blocks before and including end.

func (*ORM) DeleteExpiredLogs added in v2.2.0 

func (o *ORM) DeleteExpiredLogs(qopts ...pg.QOpt) error

func (*ORM) DeleteFilter 

func (o *ORM) DeleteFilter(name string, qopts ...pg.QOpt) error

DeleteFilter removes all events,address pairs associated with the Filter

func (*ORM) DeleteLogsAfter 

func (o *ORM) DeleteLogsAfter(start int64, qopts ...pg.QOpt) error

func (*ORM) GetBlocksRange 

func (o *ORM) GetBlocksRange(start uint64, end uint64, qopts ...pg.QOpt) ([]LogPollerBlock, error)

func (*ORM) InsertBlock 

func (o *ORM) InsertBlock(h common.Hash, n int64, t time.Time, qopts ...pg.QOpt) error

InsertBlock is idempotent to support replays.

func (*ORM) InsertFilter 

func (o *ORM) InsertFilter(filter Filter, qopts ...pg.QOpt) (err error)

InsertFilter is idempotent.

Each address/event pair must have a unique job id, so it may be removed when the job is deleted. If a second job tries to overwrite the same pair, this should fail.

func (*ORM) InsertLogs 

func (o *ORM) InsertLogs(logs []Log, qopts ...pg.QOpt) error

InsertLogs is idempotent to support replays.

func (*ORM) LoadFilters 

func (o *ORM) LoadFilters(qopts ...pg.QOpt) (map[string]Filter, error)

LoadFiltersForChain returns all filters for this chain

func (*ORM) SelectBlockByHash 

func (o *ORM) SelectBlockByHash(h common.Hash, qopts ...pg.QOpt) (*LogPollerBlock, error)

func (*ORM) SelectBlockByNumber 

func (o *ORM) SelectBlockByNumber(n int64, qopts ...pg.QOpt) (*LogPollerBlock, error)

func (*ORM) SelectDataWordGreaterThan 

func (o *ORM) SelectDataWordGreaterThan(address common.Address, eventSig common.Hash, wordIndex int, wordValueMin common.Hash, confs int, qopts ...pg.QOpt) ([]Log, error)

func (*ORM) SelectDataWordRange 

func (o *ORM) SelectDataWordRange(address common.Address, eventSig common.Hash, wordIndex int, wordValueMin, wordValueMax common.Hash, confs int, qopts ...pg.QOpt) ([]Log, error)

func (*ORM) SelectIndexLogsTopicGreaterThan 

func (o *ORM) SelectIndexLogsTopicGreaterThan(address common.Address, eventSig common.Hash, topicIndex int, topicValueMin common.Hash, confs int, qopts ...pg.QOpt) ([]Log, error)

func (*ORM) SelectIndexLogsTopicRange 

func (o *ORM) SelectIndexLogsTopicRange(address common.Address, eventSig common.Hash, topicIndex int, topicValueMin, topicValueMax common.Hash, confs int, qopts ...pg.QOpt) ([]Log, error)

func (*ORM) SelectIndexedLogs 

func (o *ORM) SelectIndexedLogs(address common.Address, eventSig common.Hash, topicIndex int, topicValues []common.Hash, confs int, qopts ...pg.QOpt) ([]Log, error)

func (*ORM) SelectIndexedLogsByBlockRangeFilter 

func (o *ORM) SelectIndexedLogsByBlockRangeFilter(start, end int64, address common.Address, eventSig common.Hash, topicIndex int, topicValues []common.Hash, qopts ...pg.QOpt) ([]Log, error)

SelectIndexedLogsByBlockRangeFilter finds the indexed logs in a given block range.

func (*ORM) SelectIndexedLogsWithSigsExcluding added in v2.1.0 

func (o *ORM) SelectIndexedLogsWithSigsExcluding(sigA, sigB common.Hash, topicIndex int, address common.Address, startBlock, endBlock int64, confs int, qopts ...pg.QOpt) ([]Log, error)

SelectIndexedLogsWithSigsExcluding query's for logs that have signature A and exclude logs that have a corresponding signature B, matching is done based on the topic index both logs should be inside the block range and have the minimum number of confirmations

func (*ORM) SelectLatestBlock 

func (o *ORM) SelectLatestBlock(qopts ...pg.QOpt) (*LogPollerBlock, error)

func (*ORM) SelectLatestLogEventSigWithConfs 

func (o *ORM) SelectLatestLogEventSigWithConfs(eventSig common.Hash, address common.Address, confs int, qopts ...pg.QOpt) (*Log, error)

func (*ORM) SelectLatestLogEventSigsAddrsWithConfs 

func (o *ORM) SelectLatestLogEventSigsAddrsWithConfs(fromBlock int64, addresses []common.Address, eventSigs []common.Hash, confs int, qopts ...pg.QOpt) ([]Log, error)

SelectLatestLogEventSigsAddrsWithConfs finds the latest log by (address, event) combination that matches a list of Addresses and list of events

func (*ORM) SelectLogsByBlockRange 

func (o *ORM) SelectLogsByBlockRange(start, end int64) ([]Log, error)

func (*ORM) SelectLogsByBlockRangeFilter 

func (o *ORM) SelectLogsByBlockRangeFilter(start, end int64, address common.Address, eventSig common.Hash, qopts ...pg.QOpt) ([]Log, error)

SelectLogsByBlockRangeFilter finds the logs in a given block range.

func (*ORM) SelectLogsWithSigsByBlockRangeFilter 

func (o *ORM) SelectLogsWithSigsByBlockRangeFilter(start, end int64, address common.Address, eventSigs []common.Hash, qopts ...pg.QOpt) (logs []Log, err error)

SelectLogsWithSigsByBlockRangeFilter finds the logs in the given block range with the given event signatures emitted from the given address.

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