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This introduces a new indexing infrastructure for supporting optional
indexes using the new database and blockchain infrastructure along with
two concrete indexer implementations which provide both a
transaction-by-hash and a transaction-by-address index.
The new infrastructure is mostly separated into a package named indexers
which is housed under the blockchain package. In order to support this,
a new interface named IndexManager has been introduced in the blockchain
package which provides methods to be notified when the chain has been
initialized and when blocks are connected and disconnected from the main
chain. A concrete implementation of an index manager is provided by the
new indexers package.
The new indexers package also provides a new interface named Indexer
which allows the index manager to manage concrete index implementations
which conform to the interface.
The following is high level overview of the main index infrastructure
changes:
- Define a new IndexManager interface in the blockchain package and
modify the package to make use of the interface when specified
- Create a new indexers package
- Provides an Index interface which allows concrete indexes to plugin
to an index manager
- Provides a concrete IndexManager implementation
- Handles the lifecycle of all indexes it manages
- Tracks the index tips
- Handles catching up disabled indexes that have been reenabled
- Handles reorgs while the index was disabled
- Invokes the appropriate methods for all managed indexes to allow
them to index and deindex the blocks and transactions
- Implement a transaction-by-hash index
- Makes use of internal block IDs to save a significant amount of
space and indexing costs over the old transaction index format
- Implement a transaction-by-address index
- Makes use of a leveling scheme in order to provide a good tradeoff
between space required and indexing costs
- Supports enabling and disabling indexes at will
- Support the ability to drop indexes if they are no longer desired
The following is an overview of the btcd changes:
- Add a new index logging subsystem
- Add new options --txindex and --addrindex in order to enable the
optional indexes
- NOTE: The transaction index will automatically be enabled when the
address index is enabled because it depends on it
- Add new options --droptxindex and --dropaddrindex to allow the indexes
to be removed
- NOTE: The address index will also be removed when the transaction
index is dropped because it depends on it
- Update getrawtransactions RPC to make use of the transaction index
- Reimplement the searchrawtransaction RPC that makes use of the address
index
- Update sample-btcd.conf to include sample usage for the new optional
index flags
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indexers
[
]
(https://travis-ci.org/btcsuite/btcd)
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
Documentation
[
]
(http://godoc.org/github.com/btcsuite/btcd/blockchain/indexers)
Full go doc style documentation for the project can be viewed online without
installing this package by using the GoDoc site here:
http://godoc.org/github.com/btcsuite/btcd/blockchain/indexers
You can also view the documentation locally once the package is installed with
the godoc tool by running godoc -http=":6060" and pointing your browser to
http://localhost:6060/pkg/github.com/btcsuite/btcd/blockchain/indexers
Installation
$ go get -u github.com/btcsuite/btcd/blockchain/indexers
License
Package indexers is licensed under the copyfree ISC License.