filters

package
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 Go to latest Published: Sep 26, 2024 License: GPL-3.0 Imports: 20 Imported by: 0

Documentation

Overview

Package filters implements a Kaia filtering system for blocks, transactions and log events.

Source Files

  • api.go : provides public filter API functions to generate filters and use them to filter the result
  • filter.go : implements basic filtering system based on bloom filter
  • filter_system.go : provides subscription scheme to register and filter the specific events

Index

Constants

This section is empty.

Variables

View Source 
var (
	GetLogsDeadline = 10 * time.Second // execution deadlines for getLogs and getFilterLogs APIs
	GetLogsMaxItems = int(10000)       // maximum allowed number of return items for getLogs and getFilterLogs APIs
)
View Source 
var (
	ErrInvalidSubscriptionID = errors.New("invalid id")
)

Functions

func RPCMarshalHeader 

func RPCMarshalHeader(head *types.Header, rules params.Rules) map[string]interface{}

RPCMarshalHeader converts the given header to the RPC output that includes Klaytn-specific fields. For kaia_getHeaderByNumber and kaia_getHeaderByHash APIs.

Types

type Backend 

type Backend interface {
	ChainDB() database.DBManager
	EventMux() *event.TypeMux
	HeaderByHash(ctx context.Context, blockHash common.Hash) (*types.Header, error)
	HeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Header, error)
	GetBlockReceipts(ctx context.Context, blockHash common.Hash) types.Receipts
	GetLogs(ctx context.Context, blockHash common.Hash) ([][]*types.Log, error)

	SubscribeNewTxsEvent(chan<- blockchain.NewTxsEvent) event.Subscription
	SubscribeChainEvent(ch chan<- blockchain.ChainEvent) event.Subscription
	SubscribeRemovedLogsEvent(ch chan<- blockchain.RemovedLogsEvent) event.Subscription
	SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription

	BloomStatus() (uint64, uint64)
	ServiceFilter(ctx context.Context, session *bloombits.MatcherSession)

	ChainConfig() *params.ChainConfig
}

type EventSystem 

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

EventSystem creates subscriptions, processes events and broadcasts them to the subscription which match the subscription criteria.

func NewEventSystem 

func NewEventSystem(mux *event.TypeMux, backend Backend, lightMode bool) *EventSystem

NewEventSystem creates a new manager that listens for event on the given mux, parses and filters them. It uses the all map to retrieve filter changes. The work loop holds its own index that is used to forward events to filters.

The returned manager has a loop that needs to be stopped with the Stop function or by stopping the given mux.

func (*EventSystem) SubscribeLogs 

func (es *EventSystem) SubscribeLogs(crit kaia.FilterQuery, logs chan []*types.Log) (*Subscription, error)

SubscribeLogs creates a subscription that will write all logs matching the given criteria to the given logs channel. Default value for the from and to block is "latest". If the fromBlock > toBlock an error is returned.

func (*EventSystem) SubscribeNewHeads 

func (es *EventSystem) SubscribeNewHeads(headers chan *types.Header) *Subscription

SubscribeNewHeads creates a subscription that writes the header of a block that is imported in the chain.

func (*EventSystem) SubscribePendingTxs 

func (es *EventSystem) SubscribePendingTxs(hashes chan []common.Hash) *Subscription

SubscribePendingTxs creates a subscription that writes transaction hashes for transactions that enter the transaction pool.

type Filter 

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

Filter can be used to retrieve and filter logs.

func NewBlockFilter 

func NewBlockFilter(backend Backend, block common.Hash, addresses []common.Address, topics [][]common.Hash) *Filter

NewBlockFilter creates a new filter which directly inspects the contents of a block to figure out whether it is interesting or not.

func NewRangeFilter 

func NewRangeFilter(backend Backend, begin, end int64, addresses []common.Address, topics [][]common.Hash) *Filter

NewRangeFilter creates a new filter which uses a bloom filter on blocks to figure out whether a particular block is interesting or not.

func (*Filter) Logs 

func (f *Filter) Logs(ctx context.Context) ([]*types.Log, error)

Logs searches the blockchain for matching log entries, returning all from the first block that contains matches, updating the start of the filter accordingly.

type FilterCriteria 

type FilterCriteria kaia.FilterQuery

FilterCriteria represents a request to create a new filter. Same as Kaia.FilterQuery but with UnmarshalJSON() method.

func (*FilterCriteria) UnmarshalJSON 

func (args *FilterCriteria) UnmarshalJSON(data []byte) error

UnmarshalJSON sets *args fields with given data.

type PublicFilterAPI 

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

PublicFilterAPI offers support to create and manage filters. This will allow external clients to retrieve various information related to the Kaia protocol such als blocks, transactions and logs.

func NewPublicFilterAPI 

func NewPublicFilterAPI(backend Backend, lightMode bool) *PublicFilterAPI

NewPublicFilterAPI returns a new PublicFilterAPI instance.

func (*PublicFilterAPI) Events 

func (api *PublicFilterAPI) Events() *EventSystem

Events return private field events of PublicFilterAPI.

func (*PublicFilterAPI) GetFilterChanges 

func (api *PublicFilterAPI) GetFilterChanges(id rpc.ID) (interface{}, error)

GetFilterChanges returns the logs for the filter with the given id since last time it was called. This can be used for polling.

For pending transaction and block filters the result is []common.Hash. (pending)Log filters return []Log.

func (*PublicFilterAPI) GetFilterLogs 

func (api *PublicFilterAPI) GetFilterLogs(ctx context.Context, id rpc.ID) ([]*types.Log, error)

GetFilterLogs returns the logs for the filter with the given id. If the filter could not be found an empty array of logs is returned.

func (*PublicFilterAPI) GetLogs 

func (api *PublicFilterAPI) GetLogs(ctx context.Context, crit FilterCriteria) ([]*types.Log, error)

GetLogs returns logs matching the given argument that are stored within the state.

func (*PublicFilterAPI) Logs 

func (api *PublicFilterAPI) Logs(ctx context.Context, crit FilterCriteria) (*rpc.Subscription, error)

Logs creates a subscription that fires for all new log that match the given filter criteria.

func (*PublicFilterAPI) NewBlockFilter 

func (api *PublicFilterAPI) NewBlockFilter() rpc.ID

NewBlockFilter creates a filter that fetches blocks that are imported into the chain. It is part of the filter package since polling goes with eth_getFilterChanges.

func (*PublicFilterAPI) NewFilter 

func (api *PublicFilterAPI) NewFilter(crit FilterCriteria) (rpc.ID, error)

NewFilter creates a new filter and returns the filter id. It can be used to retrieve logs when the state changes. This method cannot be used to fetch logs that are already stored in the state.

Default criteria for the from and to block are "latest". Using "latest" as block number will return logs for mined blocks. Using "pending" as block number returns logs for not yet mined (pending) blocks. In case logs are removed (chain reorg) previously returned logs are returned again but with the removed property set to true.

In case "fromBlock" > "toBlock" an error is returned.

func (*PublicFilterAPI) NewHeads 

func (api *PublicFilterAPI) NewHeads(ctx context.Context) (*rpc.Subscription, error)

NewHeads send a notification each time a new (header) block is appended to the chain.

func (*PublicFilterAPI) NewPendingTransactionFilter 

func (api *PublicFilterAPI) NewPendingTransactionFilter() rpc.ID

NewPendingTransactionFilter creates a filter that fetches pending transaction hashes as transactions enter the pending state.

It is part of the filter package because this filter can be used through the `kaia_getFilterChanges` polling method that is also used for log filters.

func (*PublicFilterAPI) NewPendingTransactions 

func (api *PublicFilterAPI) NewPendingTransactions(ctx context.Context) (*rpc.Subscription, error)

NewPendingTransactions creates a subscription that is triggered each time a transaction enters the transaction pool and was signed from one of the transactions this nodes manages.

func (*PublicFilterAPI) UninstallFilter 

func (api *PublicFilterAPI) UninstallFilter(id rpc.ID) bool

UninstallFilter removes the filter with the given filter id.

type Subscription 

type Subscription struct {
	ID rpc.ID
	// contains filtered or unexported fields
}

Subscription is created when the client registers itself for a particular event.

func (*Subscription) Err 

func (sub *Subscription) Err() <-chan error

Err returns a channel that is closed when unsubscribed.

func (*Subscription) Unsubscribe 

func (sub *Subscription) Unsubscribe()

Unsubscribe uninstalls the subscription from the event broadcast loop.

type Type 

type Type byte

Type determines the kind of filter and is used to put the filter in to the correct bucket when added. 

const (
	// UnknownSubscription indicates an unknown subscription type
	UnknownSubscription Type = iota
	// LogsSubscription queries for new or removed (chain reorg) logs
	LogsSubscription
	// PendingLogsSubscription queries for logs in pending blocks
	PendingLogsSubscription
	// MinedAndPendingLogsSubscription queries for logs in mined and pending blocks.
	MinedAndPendingLogsSubscription
	// PendingTransactionsSubscription queries tx hashes for pending
	// transactions entering the pending state
	PendingTransactionsSubscription
	// BlocksSubscription queries hashes for blocks that are imported
	BlocksSubscription
	// LastSubscription keeps track of the last index
	LastIndexSubscription
)

Source Files

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Directories

Path Synopsis
Package cn is a generated GoMock package.
 Package cn is a generated GoMock package.

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