indexers

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README

indexers

Build Status ISC License GoDoc

Package indexers implements optional block chain indexes.

These indexes are typically used to enhance the amount of information available via an RPC interface.

Supported Indexers

  • Transaction-by-hash (txbyhashidx) Index
    • Creates a mapping from the hash of each transaction to the block that contains it along with its offset and length within the serialized block
  • Transaction-by-address (txbyaddridx) Index
    • Creates a mapping from every address to all transactions which either credit or debit the address
    • Requires the transaction-by-hash index

Installation

$ go get -u github.com/gcash/bchd/blockchain/indexers

License

Package indexers is licensed under the copyfree ISC License.

Documentation

Overview

Package indexers implements optional block chain indexes.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func DisableLog 

func DisableLog()

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

func DropAddrIndex 

func DropAddrIndex(db database.DB, interrupt <-chan struct{}) error

DropAddrIndex drops the address index from the provided database if it exists.

func DropCfIndex 

func DropCfIndex(db database.DB, interrupt <-chan struct{}) error

DropCfIndex drops the CF index from the provided database if exists.

func DropSlpIndex added in v0.18.0 

func DropSlpIndex(db database.DB, interrupt <-chan struct{}) error

DropSlpIndex drops the transaction index from the provided database if it exists. Since the address index relies on it, the address index will also be dropped when it exists.

func DropTxIndex 

func DropTxIndex(db database.DB, interrupt <-chan struct{}) error

DropTxIndex drops the transaction index from the provided database if it exists. Since the address index relies on it, the address index will also be dropped when it exists.

func TopologicallySortTxs added in v0.18.0 

func TopologicallySortTxs(transactions []*bchutil.Tx) []*wire.MsgTx

TopologicallySortTxs sorts a list of transactions into topological order. That is, the child transactions come after parents.

func UseLogger 

func UseLogger(logger bchlog.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 AddTxIndexEntryHandler added in v0.18.0 

type AddTxIndexEntryHandler func(*wire.MsgTx, v1parser.ParseResult, *chainhash.Hash) error

AddTxIndexEntryHandler provides a function interface for CheckSlpTx

type AddrIndex 

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

AddrIndex implements a transaction by address index. That is to say, it supports querying all transactions that reference a given address because they are either crediting or debiting the address. The returned transactions are ordered according to their order of appearance in the blockchain. In other words, first by block height and then by offset inside the block.

In addition, support is provided for a memory-only index of unconfirmed transactions such as those which are kept in the memory pool before inclusion in a block.

func NewAddrIndex 

func NewAddrIndex(db database.DB, chainParams *chaincfg.Params) *AddrIndex

NewAddrIndex returns a new instance of an indexer that is used to create a mapping of all addresses in the blockchain to the respective transactions that involve them.

It implements the Indexer interface which plugs into the IndexManager that in turn is used by the blockchain package. This allows the index to be seamlessly maintained along with the chain.

func (*AddrIndex) AddUnconfirmedTx 

func (idx *AddrIndex) AddUnconfirmedTx(tx *bchutil.Tx, utxoView *blockchain.UtxoViewpoint)

AddUnconfirmedTx adds all addresses related to the transaction to the unconfirmed (memory-only) address index.

NOTE: This transaction MUST have already been validated by the memory pool before calling this function with it and have all of the inputs available in the provided utxo view. Failure to do so could result in some or all addresses not being indexed.

This function is safe for concurrent access.

func (*AddrIndex) ConnectBlock 

func (idx *AddrIndex) ConnectBlock(dbTx database.Tx, block *bchutil.Block,
	stxos []blockchain.SpentTxOut) error

ConnectBlock is invoked by the index manager when a new block has been connected to the main chain. This indexer adds a mapping for each address the transactions in the block involve.

This is part of the Indexer interface.

func (*AddrIndex) Create 

func (idx *AddrIndex) Create(dbTx database.Tx) error

Create is invoked when the indexer manager determines the index needs to be created for the first time. It creates the bucket for the address index.

This is part of the Indexer interface.

func (*AddrIndex) DisconnectBlock 

func (idx *AddrIndex) DisconnectBlock(dbTx database.Tx, block *bchutil.Block,
	stxos []blockchain.SpentTxOut) error

DisconnectBlock is invoked by the index manager when a block has been disconnected from the main chain. This indexer removes the address mappings each transaction in the block involve.

This is part of the Indexer interface.

func (*AddrIndex) Init 

func (idx *AddrIndex) Init() error

Init is only provided to satisfy the Indexer interface as there is nothing to initialize for this index.

This is part of the Indexer interface.

func (*AddrIndex) Key 

func (idx *AddrIndex) Key() []byte

Key returns the database key to use for the index as a byte slice.

This is part of the Indexer interface.

func (*AddrIndex) Migrate 

func (idx *AddrIndex) Migrate(db database.DB, interrupt <-chan struct{}) error

Migrate is only provided to satisfy the Indexer interface as there is nothing to migrate this index.

This is part of the Indexer interface.

func (*AddrIndex) Name 

func (idx *AddrIndex) Name() string

Name returns the human-readable name of the index.

This is part of the Indexer interface.

func (*AddrIndex) NeedsInputs 

func (idx *AddrIndex) NeedsInputs() bool

NeedsInputs signals that the index requires the referenced inputs in order to properly create the index.

This implements the NeedsInputser interface.

func (*AddrIndex) RemoveUnconfirmedTx 

func (idx *AddrIndex) RemoveUnconfirmedTx(hash *chainhash.Hash)

RemoveUnconfirmedTx removes the passed transaction from the unconfirmed (memory-only) address index.

This function is safe for concurrent access.

func (*AddrIndex) StartBlock added in v0.18.0 

func (idx *AddrIndex) StartBlock() (*chainhash.Hash, int32)

StartBlock is used to indicate the proper start block for the index manager.

This is part of the Indexer interface.

func (*AddrIndex) TxRegionsForAddress 

func (idx *AddrIndex) TxRegionsForAddress(dbTx database.Tx, addr bchutil.Address, numToSkip, numRequested uint32, reverse bool) ([]database.BlockRegion, uint32, error)

TxRegionsForAddress returns a slice of block regions which identify each transaction that involves the passed address according to the specified number to skip, number requested, and whether or not the results should be reversed. It also returns the number actually skipped since it could be less in the case where there are not enough entries.

NOTE: These results only include transactions confirmed in blocks. See the UnconfirmedTxnsForAddress method for obtaining unconfirmed transactions that involve a given address.

This function is safe for concurrent access.

func (*AddrIndex) UnconfirmedTxnsForAddress 

func (idx *AddrIndex) UnconfirmedTxnsForAddress(addr bchutil.Address) []*bchutil.Tx

UnconfirmedTxnsForAddress returns all transactions currently in the unconfirmed (memory-only) address index that involve the passed address. Unsupported address types are ignored and will result in no results.

This function is safe for concurrent access.

type AssertError 

type AssertError string

AssertError identifies an error that indicates an internal code consistency issue and should be treated as a critical and unrecoverable error.

func (AssertError) Error 

func (e AssertError) Error() string

Error returns the assertion error as a huma-readable string and satisfies the error interface.

type BurnedInput added in v0.18.0 

type BurnedInput struct {
	Tx      *wire.MsgTx
	TxInput *wire.TxIn
	SlpMsg  v1parser.ParseResult
	Entry   *SlpTxEntry
}

BurnedInput represents a burned slp txo item

func CheckSlpTx added in v0.18.0 

func CheckSlpTx(tx *wire.MsgTx, getSlpIndexEntry GetSlpIndexEntryHandler, putTxIndexEntry AddTxIndexEntryHandler) (bool, []*BurnedInput, error)

CheckSlpTx checks a transaction for validity and adds valid transactions to the db

type CfIndex 

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

CfIndex implements a committed filter (cf) by hash index.

func NewCfIndex 

func NewCfIndex(db database.DB, chainParams *chaincfg.Params) *CfIndex

NewCfIndex returns a new instance of an indexer that is used to create a mapping of the hashes of all blocks in the blockchain to their respective committed filters.

It implements the Indexer interface which plugs into the IndexManager that in turn is used by the blockchain package. This allows the index to be seamlessly maintained along with the chain.

func (*CfIndex) ConnectBlock 

func (idx *CfIndex) ConnectBlock(dbTx database.Tx, block *bchutil.Block,
	stxos []blockchain.SpentTxOut) error

ConnectBlock is invoked by the index manager when a new block has been connected to the main chain. This indexer adds a hash-to-cf mapping for every passed block. This is part of the Indexer interface.

func (*CfIndex) Create 

func (idx *CfIndex) Create(dbTx database.Tx) error

Create is invoked when the indexer manager determines the index needs to be created for the first time. It creates buckets for the two hash-based cf indexes (regular only currently).

func (*CfIndex) DisconnectBlock 

func (idx *CfIndex) DisconnectBlock(dbTx database.Tx, block *bchutil.Block,
	_ []blockchain.SpentTxOut) error

DisconnectBlock is invoked by the index manager when a block has been disconnected from the main chain. This indexer removes the hash-to-cf mapping for every passed block. This is part of the Indexer interface.

func (*CfIndex) FilterByBlockHash 

func (idx *CfIndex) FilterByBlockHash(h *chainhash.Hash,
	filterType wire.FilterType) ([]byte, error)

FilterByBlockHash returns the serialized contents of a block's basic or committed filter.

func (*CfIndex) FilterHashByBlockHash 

func (idx *CfIndex) FilterHashByBlockHash(h *chainhash.Hash,
	filterType wire.FilterType) ([]byte, error)

FilterHashByBlockHash returns the serialized contents of a block's basic committed filter hash.

func (*CfIndex) FilterHashesByBlockHashes 

func (idx *CfIndex) FilterHashesByBlockHashes(blockHashes []*chainhash.Hash,
	filterType wire.FilterType) ([][]byte, error)

FilterHashesByBlockHashes returns the serialized contents of a block's basic committed filter hash for a set of blocks by hash.

func (*CfIndex) FilterHeaderByBlockHash 

func (idx *CfIndex) FilterHeaderByBlockHash(h *chainhash.Hash,
	filterType wire.FilterType) ([]byte, error)

FilterHeaderByBlockHash returns the serialized contents of a block's basic committed filter header.

func (*CfIndex) FilterHeadersByBlockHashes 

func (idx *CfIndex) FilterHeadersByBlockHashes(blockHashes []*chainhash.Hash,
	filterType wire.FilterType) ([][]byte, error)

FilterHeadersByBlockHashes returns the serialized contents of a block's basic committed filter header for a set of blocks by hash.

func (*CfIndex) FiltersByBlockHashes 

func (idx *CfIndex) FiltersByBlockHashes(blockHashes []*chainhash.Hash,
	filterType wire.FilterType) ([][]byte, error)

FiltersByBlockHashes returns the serialized contents of a block's basic or committed filter for a set of blocks by hash.

func (*CfIndex) Init 

func (idx *CfIndex) Init() error

Init initializes the hash-based cf index. This is part of the Indexer interface.

func (*CfIndex) Key 

func (idx *CfIndex) Key() []byte

Key returns the database key to use for the index as a byte slice. This is part of the Indexer interface.

func (*CfIndex) Migrate 

func (idx *CfIndex) Migrate(db database.DB, interrupt <-chan struct{}) error

Migrate migrates the index up to the current version. For the CfIndex we will just drop the index here and write the new version number. The IndexManager will then rebuild the index from the blockchain, using the new scheme, as it continues its Init function.

This is part of the Indexer interface.

func (*CfIndex) Name 

func (idx *CfIndex) Name() string

Name returns the human-readable name of the index. This is part of the Indexer interface.

func (*CfIndex) NeedsInputs 

func (idx *CfIndex) NeedsInputs() bool

NeedsInputs signals that the index requires the referenced inputs in order to properly create the index.

This implements the NeedsInputser interface.

func (*CfIndex) StartBlock added in v0.18.0 

func (idx *CfIndex) StartBlock() (*chainhash.Hash, int32)

StartBlock is used to indicate the proper start block for the index manager.

This is part of the Indexer interface.

type GetSlpIndexEntryHandler added in v0.18.0 

type GetSlpIndexEntryHandler func(*chainhash.Hash) (*SlpTxEntry, error)

GetSlpIndexEntryHandler provides a function interface for CheckSlpTx

type Indexer 

type Indexer interface {
	// Key returns the key of the index as a byte slice.
	Key() []byte

	// Name returns the human-readable name of the index.
	Name() string

	// Create is invoked when the indexer manager determines the index needs
	// to be created for the first time.
	Create(dbTx database.Tx) error

	// Migrate is invoked after Init and allows each index the opportunity
	// to perform any migrations as necessary. This should be a noop if
	// there are no migrations to perform.
	Migrate(db database.DB, interrupt <-chan struct{}) error

	// Init is invoked when the index manager is first initializing the
	// index.  This differs from the Create method in that it is called on
	// every load, including the case the index was just created.
	Init() error

	// ConnectBlock is invoked when a new block has been connected to the
	// main chain. The set of output spent within a block is also passed in
	// so indexers can access the pevious output scripts input spent if
	// required.
	ConnectBlock(database.Tx, *bchutil.Block, []blockchain.SpentTxOut) error

	// DisconnectBlock is invoked when a block has been disconnected from
	// the main chain. The set of outputs scripts that were spent within
	// this block is also returned so indexers can clean up the prior index
	// state for this block
	DisconnectBlock(database.Tx, *bchutil.Block, []blockchain.SpentTxOut) error

	// StartBlock is invoked to get which block the indexer should be
	// started from.  The first indexed height is after this block, and the
	// block hash returned here is compared against the first indexed block's
	// previous block hash.
	StartBlock() (hash *chainhash.Hash, height int32)
}

Indexer provides a generic interface for an indexer that is managed by an index manager such as the Manager type provided by this package.

type Manager 

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

Manager defines an index manager that manages multiple optional indexes and implements the blockchain.IndexManager interface so it can be seamlessly plugged into normal chain processing.

func NewManager 

func NewManager(db database.DB, enabledIndexes []Indexer) *Manager

NewManager returns a new index manager with the provided indexes enabled.

The manager returned satisfies the blockchain.IndexManager interface and thus cleanly plugs into the normal blockchain processing path.

func (*Manager) ConnectBlock 

func (m *Manager) ConnectBlock(dbTx database.Tx, block *bchutil.Block,
	stxos []blockchain.SpentTxOut) error

ConnectBlock must be invoked when a block is extending the main chain. It keeps track of the state of each index it is managing, performs some sanity checks, and invokes each indexer.

This is part of the blockchain.IndexManager interface.

func (*Manager) DisconnectBlock 

func (m *Manager) DisconnectBlock(dbTx database.Tx, block *bchutil.Block,
	stxo []blockchain.SpentTxOut) error

DisconnectBlock must be invoked when a block is being disconnected from the end of the main chain. It keeps track of the state of each index it is managing, performs some sanity checks, and invokes each indexer to remove the index entries associated with the block.

This is part of the blockchain.IndexManager interface.

func (*Manager) Init 

func (m *Manager) Init(chain *blockchain.BlockChain, interrupt <-chan struct{}) error

Init initializes the enabled indexes. This is called during chain initialization and primarily consists of catching up all indexes to the current best chain tip. This is necessary since each index can be disabled and re-enabled at any time and attempting to catch-up indexes at the same time new blocks are being downloaded would lead to an overall longer time to catch up due to the I/O contention.

This is part of the blockchain.IndexManager interface.

type NeedsInputser 

type NeedsInputser interface {
	NeedsInputs() bool
}

NeedsInputser provides a generic interface for an indexer to specify the it requires the ability to look up inputs for a transaction.

type SlpCache added in v0.18.0 

type SlpCache struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

SlpCache to manage slp index mempool inventory and recently queried slp index entries and token metadata items. The RWMutex lock is held for mempoolSlpTxEntries operations since gcache.Cache holds its own locks.

func InitSlpCache added in v0.18.0 

func InitSlpCache(maxEntries int) *SlpCache

InitSlpCache creates a new instance of SlpCache

func (*SlpCache) AddMempoolSlpTxEntry added in v0.18.0 

func (s *SlpCache) AddMempoolSlpTxEntry(hash *chainhash.Hash, item SlpTxEntry)

AddMempoolSlpTxEntry puts new items in the mempool cache

func (*SlpCache) AddSlpTxEntry added in v0.18.0 

func (s *SlpCache) AddSlpTxEntry(hash *chainhash.Hash, item SlpTxEntry) error

AddSlpTxEntry puts new items in a temporary cache with limited size

func (*SlpCache) AddTempTokenMetadata added in v0.18.0 

func (s *SlpCache) AddTempTokenMetadata(item TokenMetadata) error

AddTempTokenMetadata puts token metadata into cache with a limited size

func (*SlpCache) ForEachMempoolItem added in v0.18.0 

func (s *SlpCache) ForEachMempoolItem(fnc func(hash *chainhash.Hash, entry *SlpTxEntry) error) error

ForEachMempoolItem provides thread-safe access to all mempool entries

func (*SlpCache) GetMempoolItem added in v0.18.0 

func (s *SlpCache) GetMempoolItem(hash *chainhash.Hash) *SlpTxEntry

GetMempoolItem gets items from only mempool entries

func (*SlpCache) GetSlpTxEntry added in v0.18.0 

func (s *SlpCache) GetSlpTxEntry(hash *chainhash.Hash) (SlpTxEntry, bool)

GetSlpTxEntry gets tx entry items from the cache

func (*SlpCache) GetTokenMetadata added in v0.18.0 

func (s *SlpCache) GetTokenMetadata(hash *chainhash.Hash) (TokenMetadata, bool)

GetTokenMetadata gets token metadata from the cache

func (*SlpCache) MempoolSize added in v0.18.0 

func (s *SlpCache) MempoolSize() int

MempoolSize returns the size of the slp mempool cache

func (*SlpCache) RemoveMempoolSlpTxItems added in v0.18.0 

func (s *SlpCache) RemoveMempoolSlpTxItems(txs []*bchutil.Tx)

RemoveMempoolSlpTxItems is called on block events to remove mempool transaction items and also we clear the tempTokenMetadata to avoid corrupt mint baton state from double spends

func (*SlpCache) RemoveTokenMetadata added in v0.18.0 

func (s *SlpCache) RemoveTokenMetadata(hash chainhash.Hash)

RemoveTokenMetadata removes a token metadata item from cache

type SlpConfig added in v0.18.0 

type SlpConfig struct {
	StartHash             *chainhash.Hash
	StartHeight           int32
	AddrPrefix            string
	MaxCacheSize          int
	SlpGraphSearchEnabled bool
}

SlpConfig provides the proper starting height and hash

type SlpIndex added in v0.18.0 

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

SlpIndex implements a transaction by hash index. That is to say, it supports querying all transactions by their hash.

func NewSlpIndex added in v0.18.0 

func NewSlpIndex(db database.DB, cfg *SlpConfig) *SlpIndex

NewSlpIndex returns a new instance of an indexer that is used to create a mapping of the hashes of all slp transactions in the blockchain to the respective token ID, and token metadata.

It implements the Indexer interface which plugs into the IndexManager that in turn is used by the blockchain package. This allows the index to be seamlessly maintained along with the chain.

func (*SlpIndex) AddGraphSearchTxn added in v0.18.0 

func (idx *SlpIndex) AddGraphSearchTxn(tx *wire.MsgTx)

AddGraphSearchTxn adds a transaction to graph search.

func (*SlpIndex) AddPotentialSlpEntries added in v0.18.0 

func (idx *SlpIndex) AddPotentialSlpEntries(dbTx database.Tx, msgTx *wire.MsgTx) (bool, error)

AddPotentialSlpEntries checks if a transaction is slp valid and then will add a new SlpIndexEntry to the shared cache of valid slp transactions.

This method should be used to assess slp validity of newly received mempool items and also in rpc client subscriber methods that return notifications for both mempool and block events to prevent any possibility of a race conditions with manageSlpEntryCache.

func (*SlpIndex) ConnectBlock added in v0.18.0 

func (idx *SlpIndex) ConnectBlock(dbTx database.Tx, block *bchutil.Block, stxos []blockchain.SpentTxOut) error

ConnectBlock is invoked by the index manager when a new block has been connected to the main chain. This indexer adds a hash-to-transaction mapping for every transaction in the passed block.

This is part of the Indexer interface.

func (*SlpIndex) Create added in v0.18.0 

func (idx *SlpIndex) Create(dbTx database.Tx) error

Create is invoked when the indexer manager determines the index needs to be created for the first time. It creates the buckets for the hash-based transaction index and the internal token ID and token metadata indexes.

This is part of the Indexer interface.

func (*SlpIndex) DisconnectBlock added in v0.18.0 

func (idx *SlpIndex) DisconnectBlock(dbTx database.Tx, block *bchutil.Block, stxos []blockchain.SpentTxOut) error

DisconnectBlock is invoked by the index manager when a block has been disconnected from the main chain. This indexer removes the hash-to-transaction mapping for every transaction in the block.

This is part of the Indexer interface.

func (*SlpIndex) GetGraphSearchDb added in v0.18.0 

func (idx *SlpIndex) GetGraphSearchDb() (*slpgraphsearch.Db, error)

GetGraphSearchDb checks if graph search is enabled and returns the db

func (*SlpIndex) GetSlpIndexEntry added in v0.18.0 

func (idx *SlpIndex) GetSlpIndexEntry(dbTx database.Tx, hash *chainhash.Hash) (*SlpTxEntry, error)

GetSlpIndexEntry returns a serialized slp index entry for the provided transaction hash from the slp index. The slp index entry can in turn be used to quickly discover additional slp information about the transaction. When there is no entry for the provided hash, nil will be returned for the both the entry and the error, which would mean the transaction is invalid

This function is safe for concurrent access.

func (*SlpIndex) GetTokenMetadata added in v0.18.0 

func (idx *SlpIndex) GetTokenMetadata(dbTx database.Tx, entry *SlpTxEntry) (*TokenMetadata, error)

GetTokenMetadata fetches token metadata properties from an SlpIndexEntry

func (*SlpIndex) GraphSearchEnabled added in v0.18.0 

func (idx *SlpIndex) GraphSearchEnabled() bool

GraphSearchEnabled indicates if slp graph search is enabled

func (*SlpIndex) Init added in v0.18.0 

func (idx *SlpIndex) Init() error

Init initializes the hash-based slp transaction index. In particular, it finds the highest used Token ID and stores it for later use when a new token has been created.

This is part of the Indexer interface.

func (*SlpIndex) Key added in v0.18.0 

func (idx *SlpIndex) Key() []byte

Key returns the database key to use for the index as a byte slice.

This is part of the Indexer interface.

func (*SlpIndex) LoadSlpGraphSearchDb added in v0.18.0 

func (idx *SlpIndex) LoadSlpGraphSearchDb(fetchTxn func(txnHash *chainhash.Hash) ([]byte, error), initWg *sync.WaitGroup, interupt *int32)

LoadSlpGraphSearchDb is used to load data needed for slp graph search

NOTE: this is launched as a goroutine and does not return errors!

func (*SlpIndex) Migrate added in v0.18.0 

func (idx *SlpIndex) Migrate(db database.DB, interrupt <-chan struct{}) error

Migrate is only provided to satisfy the Indexer interface as there is nothing to migrate this index.

This is part of the Indexer interface.

func (*SlpIndex) Name added in v0.18.0 

func (idx *SlpIndex) Name() string

Name returns the human-readable name of the index.

This is part of the Indexer interface.

func (*SlpIndex) StartBlock added in v0.18.0 

func (idx *SlpIndex) StartBlock() (*chainhash.Hash, int32)

StartBlock is used to indicate the proper start block for the index manager.

This is part of the Indexer interface.

type SlpTxEntry added in v0.18.0 

type SlpTxEntry struct {
	TokenID        uint32
	TokenIDHash    chainhash.Hash
	SlpVersionType v1parser.TokenType
	SlpOpReturn    []byte
}

SlpTxEntry is a valid slp token stored in the slp index

type TokenMetadata added in v0.18.0 

type TokenMetadata struct {
	TokenID       *chainhash.Hash
	SlpVersion    v1parser.TokenType
	NftGroupID    *chainhash.Hash
	MintBatonHash *chainhash.Hash
	MintBatonVout uint32
}

TokenMetadata is used to hold the unmarshalled data parsed from the Token ID index

type TxIndex 

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

TxIndex implements a transaction by hash index. That is to say, it supports querying all transactions by their hash.

func NewTxIndex 

func NewTxIndex(db database.DB) *TxIndex

NewTxIndex returns a new instance of an indexer that is used to create a mapping of the hashes of all transactions in the blockchain to the respective block, location within the block, and size of the transaction.

It implements the Indexer interface which plugs into the IndexManager that in turn is used by the blockchain package. This allows the index to be seamlessly maintained along with the chain.

func (*TxIndex) ConnectBlock 

func (idx *TxIndex) ConnectBlock(dbTx database.Tx, block *bchutil.Block,
	stxos []blockchain.SpentTxOut) error

ConnectBlock is invoked by the index manager when a new block has been connected to the main chain. This indexer adds a hash-to-transaction mapping for every transaction in the passed block.

This is part of the Indexer interface.

func (*TxIndex) Create 

func (idx *TxIndex) Create(dbTx database.Tx) error

Create is invoked when the indexer manager determines the index needs to be created for the first time. It creates the buckets for the hash-based transaction index and the internal block ID indexes.

This is part of the Indexer interface.

func (*TxIndex) DisconnectBlock 

func (idx *TxIndex) DisconnectBlock(dbTx database.Tx, block *bchutil.Block,
	stxos []blockchain.SpentTxOut) error

DisconnectBlock is invoked by the index manager when a block has been disconnected from the main chain. This indexer removes the hash-to-transaction mapping for every transaction in the block.

This is part of the Indexer interface.

func (*TxIndex) Init 

func (idx *TxIndex) Init() error

Init initializes the hash-based transaction index. In particular, it finds the highest used block ID and stores it for later use when connecting or disconnecting blocks.

This is part of the Indexer interface.

func (*TxIndex) Key 

func (idx *TxIndex) Key() []byte

Key returns the database key to use for the index as a byte slice.

This is part of the Indexer interface.

func (*TxIndex) Migrate 

func (idx *TxIndex) Migrate(db database.DB, interrupt <-chan struct{}) error

Migrate is only provided to satisfy the Indexer interface as there is nothing to migrate this index.

This is part of the Indexer interface.

func (*TxIndex) Name 

func (idx *TxIndex) Name() string

Name returns the human-readable name of the index.

This is part of the Indexer interface.

func (*TxIndex) StartBlock added in v0.18.0 

func (idx *TxIndex) StartBlock() (*chainhash.Hash, int32)

StartBlock is used to indicate the proper start block for the index manager.

This is part of the Indexer interface.

func (*TxIndex) TxBlockRegion 

func (idx *TxIndex) TxBlockRegion(hash *chainhash.Hash) (*database.BlockRegion, error)

TxBlockRegion returns the block region for the provided transaction hash from the transaction index. The block region can in turn be used to load the raw transaction bytes. When there is no entry for the provided hash, nil will be returned for the both the entry and the error.

This function is safe for concurrent access.

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