filters

package
v0.40.1 Latest Latest
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 Go to latest Published: Nov 25, 2024 License: GPL-3.0 Imports: 19 Imported by: 0

Documentation

Overview

Package filters implements an quai filtering system for block, transactions and log events.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Backend 

type Backend interface {
	ChainDb() ethdb.Database
	HeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.WorkObject, error)
	HeaderByHash(ctx context.Context, blockHash common.Hash) (*types.WorkObject, error)
	GetReceipts(ctx context.Context, blockHash common.Hash) (types.Receipts, error)
	GetLogs(ctx context.Context, blockHash common.Hash) ([][]*types.Log, error)
	GetBloom(blockHash common.Hash) (*types.Bloom, error)
	GetBlock(hash common.Hash, number uint64) (*types.WorkObject, error)
	SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription
	SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent) event.Subscription
	SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription
	SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription
	SubscribePendingLogsEvent(ch chan<- []*types.Log) event.Subscription
	SubscribePendingHeaderEvent(ch chan<- *types.WorkObject) event.Subscription
	SubscribeUnlocksEvent(ch chan<- core.UnlocksEvent) event.Subscription
	ProcessingState() bool
	NodeLocation() common.Location
	NodeCtx() int

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

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(backend Backend) *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) SubscribeChainHeadEvent added in v0.39.0 

func (es *EventSystem) SubscribeChainHeadEvent(headers chan *types.WorkObject) *Subscription

SubscribeChainHeadEvent subscribes to the chain head feed

func (*EventSystem) SubscribeLogs 

func (es *EventSystem) SubscribeLogs(crit quai.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.WorkObject) *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.

func (*EventSystem) SubscribeUnlocks added in v0.39.0 

func (es *EventSystem) SubscribeUnlocks(unlocks chan core.UnlocksEvent) *Subscription

SubscribeUnlocks creates a subscription that writes the recently unlocked balances

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, logger *log.Logger) *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 quai.FilterQuery

FilterCriteria represents a request to create a new filter. Same as quai.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 Quai protocol such as blocks, transactions and logs.

func NewPublicFilterAPI 

func NewPublicFilterAPI(backend Backend, timeout time.Duration, subscriptionLimit int) *PublicFilterAPI

NewPublicFilterAPI returns a new PublicFilterAPI instance.

func (*PublicFilterAPI) Accesses added in v0.32.0 

func (api *PublicFilterAPI) Accesses(ctx context.Context, addr common.Address) (*rpc.Subscription, error)

Accesses send a notification each time the specified address is accessed

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.

https://eth.wiki/json-rpc/API#eth_getfilterchanges

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.

https://eth.wiki/json-rpc/API#eth_getfilterlogs

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.

https://eth.wiki/json-rpc/API#eth_getlogs

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.

https://eth.wiki/json-rpc/API#eth_newblockfilter

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.

https://eth.wiki/json-rpc/API#eth_newfilter

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 `eth_getFilterChanges` polling method that is also used for log filters.

https://eth.wiki/json-rpc/API#eth_newpendingtransactionfilter

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) PendingHeader 

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

PendingHeader sends a notification each time a new pending header is created.

func (*PublicFilterAPI) UninstallFilter 

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

UninstallFilter removes the filter with the given filter id.

https://eth.wiki/json-rpc/API#eth_uninstallfilter

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
	// UnlocksSubscription queries balances that are recently unlocked
	UnlocksSubscription
	// ChainHeadSubscription queries for the chain head block
	ChainHeadSubscription
	// LastSubscription keeps track of the last index
	LastIndexSubscription
)

Source Files

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