chain

package
v0.13.111 Latest Latest
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 Go to latest Published: Nov 1, 2022 License: ISC Imports: 16 Imported by: 0

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Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func BackEnds 

func BackEnds() []string

BackEnds returns a list of the available back ends. TODO: Refactor each into a driver and use dynamic registration.

func DisableLog 

func DisableLog()

DisableLog disables all library log output. Logging output is disabled by default until either UseLogger or SetLogWriter are called.

func UseLogger 

func UseLogger(logger btclog.Logger)

UseLogger uses a specified Logger to output package logging info. This should be used in preference to SetLogWriter if the caller is also using btclog.

Types

type BlockConnected 

type BlockConnected wtxmgr.BlockMeta

BlockConnected is a notification for a newly-attached block to the best chain.

type BlockDisconnected 

type BlockDisconnected wtxmgr.BlockMeta

BlockDisconnected is a notifcation that the block described by the BlockStamp was reorganized out of the best chain.

type BlockFilterer 

type BlockFilterer struct {
	// Params specifies the chain params of the current network.
	Params *chaincfg.Params

	// ReverseFilter holds a reverse index mapping an external address to
	// the scoped index from which it was derived.
	ReverseFilter map[string]waddrmgr.ScopedIndex

	// WathcedOutPoints is a global set of outpoints being tracked by the
	// wallet. This allows the block filterer to check for spends from an
	// outpoint we own.
	WatchedOutPoints map[wire.OutPoint]btcutil.Address

	// FoundAddresses is a two-layer map recording the scope and index of
	// external addresses found in a single block.
	FoundAddresses map[waddrmgr.ScopedIndex]struct{}

	// FoundOutPoints is a set of outpoints found in a single block whose
	// address belongs to the wallet.
	FoundOutPoints map[wire.OutPoint]btcutil.Address

	// RelevantTxns records the transactions found in a particular block
	// that contained matches from an address in either ExReverseFilter or
	// InReverseFilter.
	RelevantTxns []*wire.MsgTx
}

BlockFilterer is used to iteratively scan blocks for a set of addresses of interest. This is done by constructing reverse indexes mapping the addresses to a ScopedIndex, which permits the reconstruction of the exact child deriviation paths that reported matches.

Once initialized, a BlockFilterer can be used to scan any number of blocks until a invocation of `FilterBlock` returns true. This allows the reverse indexes to be resused in the event that the set of addresses does not need to be altered. After a match is reported, a new BlockFilterer should be initialized with the updated set of addresses that include any new keys that are now within our look-ahead.

We track internal and external addresses separately in order to conserve the amount of space occupied in memory. Specifically, the account and branch combined contribute only 1-bit of information when using the default scopes used by the wallet. Thus we can avoid storing an additional 64-bits per address of interest by not storing the full derivation paths, and instead opting to allow the caller to contextually infer the account (DefaultAccount) and branch (Internal or External).

func NewBlockFilterer 

func NewBlockFilterer(params *chaincfg.Params,
	req *FilterBlocksRequest) *BlockFilterer

NewBlockFilterer constructs the reverse indexes for the current set of external and internal addresses that we are searching for, and is used to scan successive blocks for addresses of interest. A particular block filter can be reused until the first call from `FitlerBlock` returns true.

func (*BlockFilterer) FilterBlock 

func (bf *BlockFilterer) FilterBlock(block *wire.MsgBlock) bool

FilterBlock parses all txns in the provided block, searching for any that contain addresses of interest in either the external or internal reverse filters. This method return true iff the block contains a non-zero number of addresses of interest, or a transaction in the block spends from outpoints controlled by the wallet.

func (*BlockFilterer) FilterOutputAddrs 

func (bf *BlockFilterer) FilterOutputAddrs(addrs []btcutil.Address) bool

FilterOutputAddrs tests the set of addresses against the block filterer's external and internal reverse address indexes. If any are found, they are added to set of external and internal found addresses, respectively. This method returns true iff a non-zero number of the provided addresses are of interest.

func (*BlockFilterer) FilterTx 

func (bf *BlockFilterer) FilterTx(tx *wire.MsgTx) bool

FilterTx scans all txouts in the provided txn, testing to see if any found addresses match those contained within the external or internal reverse indexes. This method returns true iff the txn contains a non-zero number of addresses of interest, or the transaction spends from an outpoint that belongs to the wallet.

type ClientConnected 

type ClientConnected struct{}

ClientConnected is a notification for when a client connection is opened or reestablished to the chain server.

type ConcurrentQueue 

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

ConcurrentQueue is a concurrent-safe FIFO queue with unbounded capacity. Clients interact with the queue by pushing items into the in channel and popping items from the out channel. There is a goroutine that manages moving items from the in channel to the out channel in the correct order that must be started by calling Start().

func NewConcurrentQueue 

func NewConcurrentQueue(bufferSize int) *ConcurrentQueue

NewConcurrentQueue constructs a ConcurrentQueue. The bufferSize parameter is the capacity of the output channel. When the size of the queue is below this threshold, pushes do not incur the overhead of the less efficient overflow structure.

func (*ConcurrentQueue) ChanIn 

func (cq *ConcurrentQueue) ChanIn() chan<- interface{}

ChanIn returns a channel that can be used to push new items into the queue.

func (*ConcurrentQueue) ChanOut 

func (cq *ConcurrentQueue) ChanOut() <-chan interface{}

ChanOut returns a channel that can be used to pop items from the queue.

func (*ConcurrentQueue) Start 

func (cq *ConcurrentQueue) Start()

Start begins a goroutine that manages moving items from the in channel to the out channel. The queue tries to move items directly to the out channel minimize overhead, but if the out channel is full it pushes items to an overflow queue. This must be called before using the queue.

func (*ConcurrentQueue) Stop 

func (cq *ConcurrentQueue) Stop()

Stop ends the goroutine that moves items from the in channel to the out channel.

type FilterBlocksRequest 

type FilterBlocksRequest struct {
	Blocks           []wtxmgr.BlockMeta
	Addresses        map[waddrmgr.ScopedIndex]btcutil.Address
	WatchedOutPoints map[wire.OutPoint]btcutil.Address
}

FilterBlocksRequest specifies a range of blocks and the set of internal and external addresses of interest, indexed by corresponding scoped-index of the child address. A global set of watched outpoints is also included to monitor for spends.

type FilterBlocksResponse 

type FilterBlocksResponse struct {
	BatchIndex     uint32
	BlockMeta      wtxmgr.BlockMeta
	FoundAddresses map[waddrmgr.ScopedIndex]struct{}
	FoundOutPoints map[wire.OutPoint]btcutil.Address
	RelevantTxns   []*wire.MsgTx
}

FilterBlocksResponse reports the set of all internal and external addresses found in response to a FilterBlockRequest, any outpoints found that correspond to those addresses, as well as the relevant transactions that can modify the wallet's balance. The index of the block within the FilterBlocksRequest is returned, such that the caller can reinitiate a request for the subsequent block after updating the addresses of interest.

type FilteredBlockConnected 

type FilteredBlockConnected struct {
	Block       *wtxmgr.BlockMeta
	RelevantTxs []*wtxmgr.TxRecord
}

FilteredBlockConnected is an alternate notification that contains both block and relevant transaction information in one struct, which allows atomic updates.

type Interface 

type Interface interface {
	Start() error
	Stop()
	WaitForShutdown()
	GetBestBlock() (*chainhash.Hash, int32, error)
	GetBlock(*chainhash.Hash) (*wire.MsgBlock, error)
	GetBlockHash(int64) (*chainhash.Hash, error)
	GetBlockHeader(*chainhash.Hash) (*wire.BlockHeader, error)
	IsCurrent() bool
	FilterBlocks(*FilterBlocksRequest) (*FilterBlocksResponse, error)
	BlockStamp() (*waddrmgr.BlockStamp, error)
	SendRawTransaction(*wire.MsgTx, bool) (*chainhash.Hash, error)
	Rescan(*chainhash.Hash, []btcutil.Address, map[wire.OutPoint]btcutil.Address) error
	NotifyReceived([]btcutil.Address) error
	NotifyBlocks() error
	Notifications() <-chan interface{}
	BackEnd() string
}

Interface allows more than one backing blockchain source, such as a 

RPC chain server, or an SPV library, as long as we write a driver for

it.

type RPCClient 

type RPCClient struct {
	*rpcclient.Client
	// contains filtered or unexported fields
}

RPCClient represents a persistent client connection to a bitcoin RPC server for information regarding the current best block chain.

func NewRPCClient 

func NewRPCClient(chainParams *chaincfg.Params, connect, user, pass string, certs []byte,
	disableTLS bool, skipverify bool, reconnectAttempts int) (*RPCClient, error)

NewRPCClient creates a client connection to the server described by the connect string. If disableTLS is false, the remote RPC certificate must be provided in the certs slice. The connection is not established immediately, but must be done using the Start method. If the remote server does not operate on the same bitcoin network as described by the passed chain parameters, the connection will be disconnected.

func (*RPCClient) BackEnd 

func (c *RPCClient) BackEnd() string

BackEnd returns the name of the driver.

func (*RPCClient) BlockStamp 

func (c *RPCClient) BlockStamp() (*waddrmgr.BlockStamp, error)

BlockStamp returns the latest block notified by the client, or an error if the client has been shut down.

func (*RPCClient) FilterBlocks 

func (c *RPCClient) FilterBlocks(
	req *FilterBlocksRequest) (*FilterBlocksResponse, error)

FilterBlocks scans the blocks contained in the FilterBlocksRequest for any addresses of interest. For each requested block, the corresponding compact filter will first be checked for matches, skipping those that do not report anything. If the filter returns a positive match, the full block will be fetched and filtered. This method returns a FilterBlocksResponse for the first block containing a matching address. If no matches are found in the range of blocks requested, the returned response will be nil.

func (*RPCClient) IsCurrent 

func (c *RPCClient) IsCurrent() bool

IsCurrent returns whether the chain backend considers its view of the network as "current".

func (*RPCClient) Notifications 

func (c *RPCClient) Notifications() <-chan interface{}

Notifications returns a channel of parsed notifications sent by the remote bitcoin RPC server. This channel must be continually read or the process may abort for running out memory, as unread notifications are queued for later reads.

func (*RPCClient) POSTClient 

func (c *RPCClient) POSTClient() (*rpcclient.Client, error)

POSTClient creates the equivalent HTTP POST rpcclient.Client.

func (*RPCClient) Rescan 

func (c *RPCClient) Rescan(startHash *chainhash.Hash, addrs []btcutil.Address,
	outPoints map[wire.OutPoint]btcutil.Address) error

Rescan wraps the normal Rescan command with an additional parameter that allows us to map an outpoint to the address in the chain that it pays to. This is useful when using BIP 158 filters as they include the prev pkScript rather than the full outpoint.

func (*RPCClient) Start 

func (c *RPCClient) Start() error

Start attempts to establish a client connection with the remote server. If successful, handler goroutines are started to process notifications sent by the server. After a limited number of connection attempts, this function gives up, and therefore will not block forever waiting for the connection to be established to a server that may not exist.

func (*RPCClient) Stop 

func (c *RPCClient) Stop()

Stop disconnects the client and signals the shutdown of all goroutines started by Start.

func (*RPCClient) WaitForShutdown 

func (c *RPCClient) WaitForShutdown()

WaitForShutdown blocks until both the client has finished disconnecting and all handlers have exited.

type RelevantTx 

type RelevantTx struct {
	TxRecord *wtxmgr.TxRecord
	Block    *wtxmgr.BlockMeta // nil if unmined
}

RelevantTx is a notification for a transaction which spends wallet inputs or pays to a watched address.

type RescanFinished 

type RescanFinished struct {
	Hash   *chainhash.Hash
	Height int32
	Time   time.Time
}

RescanFinished is a notification that a previous rescan request has finished.

type RescanProgress 

type RescanProgress struct {
	Hash   *chainhash.Hash
	Height int32
	Time   time.Time
}

RescanProgress is a notification describing the current status of an in-progress rescan.

Source Files

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