blockchain

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 Go to latest Published: Oct 10, 2016 License: ISC Imports: 23 Imported by: 3

README

blockchain

[Build Status] (https://travis-ci.org/decred/dcrd) ![ISC License] (http://img.shields.io/badge/license-ISC-blue.svg) [GoDoc] (http://godoc.org/github.com/decred/dcrd/blockchain)

Package blockchain implements decred block handling and chain selection rules. The test coverage is currently only around 60%, but will be increasing over time. See test_coverage.txt for the gocov coverage report. Alternatively, if you are running a POSIX OS, you can run the cov_report.sh script for a real-time report. Package blockchain is licensed under the liberal ISC license.

There is an associated blog post about the release of this package here.

This package has intentionally been designed so it can be used as a standalone package for any projects needing to handle processing of blocks into the decred block chain.

Installation and Updating

$ go get -u github.com/decred/dcrd/blockchain

Decred Chain Processing Overview

Before a block is allowed into the block chain, it must go through an intensive series of validation rules. The following list serves as a general outline of those rules to provide some intuition into what is going on under the hood, but is by no means exhaustive:

  • Reject duplicate blocks
  • Perform a series of sanity checks on the block and its transactions such as verifying proof of work, timestamps, number and character of transactions, transaction amounts, script complexity, and merkle root calculations
  • Compare the block against predetermined checkpoints for expected timestamps and difficulty based on elapsed time since the checkpoint
  • Save the most recent orphan blocks for a limited time in case their parent blocks become available
  • Stop processing if the block is an orphan as the rest of the processing depends on the block's position within the block chain
  • Perform a series of more thorough checks that depend on the block's position within the block chain such as verifying block difficulties adhere to difficulty retarget rules, timestamps are after the median of the last several blocks, all transactions are finalized, checkpoint blocks match, and block versions are in line with the previous blocks
  • Determine how the block fits into the chain and perform different actions accordingly in order to ensure any side chains which have higher difficulty than the main chain become the new main chain
  • When a block is being connected to the main chain (either through reorganization of a side chain to the main chain or just extending the main chain), perform further checks on the block's transactions such as verifying transaction duplicates, script complexity for the combination of connected scripts, coinbase maturity, double spends, and connected transaction values
  • Run the transaction scripts to verify the spender is allowed to spend the coins
  • Insert the block into the block database

Examples

License

Package blockchain is licensed under the copyfree ISC License.

Documentation

Overview

Package blockchain implements decred block handling and chain selection rules.

The decred block handling and chain selection rules are an integral, and quite likely the most important, part of decred. Unfortunately, at the time of this writing, these rules are also largely undocumented and had to be ascertained from the bitcoind source code. At its core, decred is a distributed consensus of which blocks are valid and which ones will comprise the main block chain (public ledger) that ultimately determines accepted transactions, so it is extremely important that fully validating nodes agree on all rules.

At a high level, this package provides support for inserting new blocks into the block chain according to the aforementioned rules. It includes functionality such as rejecting duplicate blocks, ensuring blocks and transactions follow all rules, orphan handling, and best chain selection along with reorganization.

Since this package does not deal with other decred specifics such as network communication or wallets, it provides a notification system which gives the caller a high level of flexibility in how they want to react to certain events such as orphan blocks which need their parents requested and newly connected main chain blocks which might result in wallet updates.

Decred Chain Processing Overview

Before a block is allowed into the block chain, it must go through an intensive series of validation rules. The following list serves as a general outline of those rules to provide some intuition into what is going on under the hood, but is by no means exhaustive:

  • Reject duplicate blocks
  • Perform a series of sanity checks on the block and its transactions such as verifying proof of work, timestamps, number and character of transactions, transaction amounts, script complexity, and merkle root calculations
  • Compare the block against predetermined checkpoints for expected timestamps and difficulty based on elapsed time since the checkpoint
  • Save the most recent orphan blocks for a limited time in case their parent blocks become available
  • Stop processing if the block is an orphan as the rest of the processing depends on the block's position within the block chain
  • Perform a series of more thorough checks that depend on the block's position within the block chain such as verifying block difficulties adhere to difficulty retarget rules, timestamps are after the median of the last several blocks, all transactions are finalized, checkpoint blocks match, and block versions are in line with the previous blocks
  • Determine how the block fits into the chain and perform different actions accordingly in order to ensure any side chains which have higher difficulty than the main chain become the new main chain
  • When a block is being connected to the main chain (either through reorganization of a side chain to the main chain or just extending the main chain), perform further checks on the block's transactions such as verifying transaction duplicates, script complexity for the combination of connected scripts, coinbase maturity, double spends, and connected transaction values
  • Run the transaction scripts to verify the spender is allowed to spend the coins
  • Insert the block into the block database

Errors

Errors returned by this package are either the raw errors provided by underlying calls or of type blockchain.RuleError. This allows the caller to differentiate between unexpected errors, such as database errors, versus errors due to rule violations through type assertions. In addition, callers can programmatically determine the specific rule violation by examining the ErrorCode field of the type asserted blockchain.RuleError.

Bitcoin Improvement Proposals

This package includes spec changes outlined by the following BIPs: 

BIP0016 (https://en.bitcoin.it/wiki/BIP_0016)
BIP0030 (https://en.bitcoin.it/wiki/BIP_0030)
BIP0034 (https://en.bitcoin.it/wiki/BIP_0034)

Index

Examples

Constants

View Source 
const (
	// ViewpointPrevValidInitial is the viewpoint from the perspective of the
	// everything up the the previous block's TxTreeRegular, used to validate
	// that tx tree regular.
	ViewpointPrevValidInitial = StakeViewpoint(iota)

	// ViewpointPrevValidStake is the viewpoint from the perspective of the
	// everything up the the previous block's TxTreeRegular plus the
	// contents of the TxTreeRegular, to validate TxTreeStake.
	ViewpointPrevValidStake

	// ViewpointPrevInvalidStake is the viewpoint from the perspective of the
	// everything up the the previous block's TxTreeRegular but without the
	// contents of the TxTreeRegular, to validate TxTreeStake.
	ViewpointPrevInvalidStake

	// ViewpointPrevValidRegular is the viewpoint from the perspective of the
	// everything up the the previous block's TxTreeRegular plus the
	// contents of the TxTreeRegular and TxTreeStake of current block,
	// to validate TxTreeRegular of the current block.
	ViewpointPrevValidRegular

	// ViewpointPrevInvalidRegular is the viewpoint from the perspective of the
	// everything up the the previous block's TxTreeRegular minus the
	// contents of the TxTreeRegular and TxTreeStake of current block,
	// to validate TxTreeRegular of the current block.
	ViewpointPrevInvalidRegular
)
View Source 
const (
	// MaxSigOpsPerBlock is the maximum number of signature operations
	// allowed for a block.  It is a fraction of the max block payload size.
	MaxSigOpsPerBlock = wire.MaxBlockPayload / 200

	// MaxTimeOffsetSeconds is the maximum number of seconds a block time
	// is allowed to be ahead of the current time.  This is currently 2
	// hours.
	MaxTimeOffsetSeconds = 2 * 60 * 60

	// MinCoinbaseScriptLen is the minimum length a coinbase script can be.
	MinCoinbaseScriptLen = 2

	// MaxCoinbaseScriptLen is the maximum length a coinbase script can be.
	MaxCoinbaseScriptLen = 100
)
View Source 
const CheckpointConfirmations = 4096

CheckpointConfirmations is the number of blocks before the end of the current best block chain that a good checkpoint candidate must be.

Variables

This section is empty.

Functions

func BigToCompact 

func BigToCompact(n *big.Int) uint32

BigToCompact converts a whole number N to a compact representation using an unsigned 32-bit number. The compact representation only provides 23 bits of precision, so values larger than (2^23 - 1) only encode the most significant digits of the number. See CompactToBig for details.

Example

This example demonstrates how to convert a target difficulty into the compact "bits" in a block header which represent that target difficulty . 

package main

import (
	"fmt"
	"math/big"

	"github.com/decred/dcrd/blockchain"

	_ "github.com/decred/dcrd/database/ffldb"
)

func main() {
	// Convert the target difficulty from block 300000 in the main block
	// chain to compact form.
	t := "0000000000000000896c00000000000000000000000000000000000000000000"
	targetDifficulty, success := new(big.Int).SetString(t, 16)
	if !success {
		fmt.Println("invalid target difficulty")
		return
	}
	bits := blockchain.BigToCompact(targetDifficulty)

	fmt.Println(bits)

}

Output:

419465580

func BlockOneCoinbasePaysTokens 

func BlockOneCoinbasePaysTokens(tx *dcrutil.Tx,
	params *chaincfg.Params) error

BlockOneCoinbasePaysTokens checks to see if the first block coinbase pays out to the network initial token ledger.

func BuildMerkleTreeStore 

func BuildMerkleTreeStore(transactions []*dcrutil.Tx) []*chainhash.Hash

BuildMerkleTreeStore creates a merkle tree from a slice of transactions, stores it using a linear array, and returns a slice of the backing array. A linear array was chosen as opposed to an actual tree structure since it uses about half as much memory. The following describes a merkle tree and how it is stored in a linear array.

A merkle tree is a tree in which every non-leaf node is the hash of its children nodes. A diagram depicting how this works for decred transactions where h(x) is a double sha256 follows: 

         root = h1234 = h(h12 + h34)
        /                           \
  h12 = h(h1 + h2)            h34 = h(h3 + h4)
   /            \              /            \
h1 = h(tx1)  h2 = h(tx2)    h3 = h(tx3)  h4 = h(tx4)

The above stored as a linear array is as follows: 

[h1 h2 h3 h4 h12 h34 root]

As the above shows, the merkle root is always the last element in the array.

The number of inputs is not always a power of two which results in a balanced tree structure as above. In that case, parent nodes with no children are also zero and parent nodes with only a single left node are calculated by concatenating the left node with itself before hashing. Since this function uses nodes that are pointers to the hashes, empty nodes will be nil.

func CalcBlockTaxSubsidy 

func CalcBlockTaxSubsidy(subsidyCache *SubsidyCache, height int64, voters uint16,
	params *chaincfg.Params) int64

CalcBlockTaxSubsidy calculates the subsidy for the organization address in the coinbase.

Safe for concurrent access.

func CalcBlockWorkSubsidy 

func CalcBlockWorkSubsidy(subsidyCache *SubsidyCache, height int64,
	voters uint16, params *chaincfg.Params) int64

CalcBlockWorkSubsidy calculates the proof of work subsidy for a block as a proportion of the total subsidy.

func CalcStakeVoteSubsidy 

func CalcStakeVoteSubsidy(subsidyCache *SubsidyCache, height int64,
	params *chaincfg.Params) int64

CalcStakeVoteSubsidy calculates the subsidy for a stake vote based on the height of its input SStx.

Safe for concurrent access.

func CalcWork 

func CalcWork(bits uint32) *big.Int

CalcWork calculates a work value from difficulty bits. Decred increases the difficulty for generating a block by decreasing the value which the generated hash must be less than. This difficulty target is stored in each block header using a compact representation as described in the documentation for CompactToBig. The main chain is selected by choosing the chain that has the most proof of work (highest difficulty). Since a lower target difficulty value equates to higher actual difficulty, the work value which will be accumulated must be the inverse of the difficulty. Also, in order to avoid potential division by zero and really small floating point numbers, the result adds 1 to the denominator and multiplies the numerator by 2^256.

func CalculateAddedSubsidy added in v0.5.0 

func CalculateAddedSubsidy(block, parent *dcrutil.Block) int64

CalculateAddedSubsidy calculates the amount of subsidy added by a block and its parent. The blocks passed to this function MUST be valid blocks that have already been confirmed to abide by the consensus rules of the network, or the function might panic.

func CheckBlockSanity 

func CheckBlockSanity(block *dcrutil.Block, timeSource MedianTimeSource,
	chainParams *chaincfg.Params) error

CheckBlockSanity performs some preliminary checks on a block to ensure it is sane before continuing with block processing. These checks are context free.

func CheckProofOfStake 

func CheckProofOfStake(block *dcrutil.Block, posLimit int64) error

CheckProofOfStake exports the above func.

func CheckProofOfWork 

func CheckProofOfWork(block *dcrutil.Block, powLimit *big.Int) error

CheckProofOfWork ensures the block header bits which indicate the target difficulty is in min/max range and that the block hash is less than the target difficulty as claimed.

func CheckTransactionInputs 

func CheckTransactionInputs(subsidyCache *SubsidyCache, tx *dcrutil.Tx,
	txHeight int64, utxoView *UtxoViewpoint, checkFraudProof bool,
	chainParams *chaincfg.Params) (int64, error)

CheckTransactionInputs performs a series of checks on the inputs to a transaction to ensure they are valid. An example of some of the checks include verifying all inputs exist, ensuring the coinbase seasoning requirements are met, detecting double spends, validating all values and fees are in the legal range and the total output amount doesn't exceed the input amount, and verifying the signatures to prove the spender was the owner of the decred and therefore allowed to spend them. As it checks the inputs, it also calculates the total fees for the transaction and returns that value.

func CheckTransactionSanity 

func CheckTransactionSanity(tx *dcrutil.Tx, params *chaincfg.Params) error

CheckTransactionSanity performs some preliminary checks on a transaction to ensure it is sane. These checks are context free.

func CheckWorklessBlockSanity 

func CheckWorklessBlockSanity(block *dcrutil.Block, timeSource MedianTimeSource,
	chainParams *chaincfg.Params) error

CheckWorklessBlockSanity performs some preliminary checks on a block to ensure it is sane before continuing with block processing. These checks are context free.

func CoinbasePaysTax 

func CoinbasePaysTax(subsidyCache *SubsidyCache, tx *dcrutil.Tx, height uint32,
	voters uint16, params *chaincfg.Params) error

CoinbasePaysTax checks to see if a given block's coinbase correctly pays tax to the developer organization.

func CompactToBig 

func CompactToBig(compact uint32) *big.Int

CompactToBig converts a compact representation of a whole number N to an unsigned 32-bit number. The representation is similar to IEEE754 floating point numbers.

Like IEEE754 floating point, there are three basic components: the sign, the exponent, and the mantissa. They are broken out as follows:

  • the most significant 8 bits represent the unsigned base 256 exponent

  • bit 23 (the 24th bit) represents the sign bit

  • the least significant 23 bits represent the mantissa

    ------------------------------------------------- | Exponent | Sign | Mantissa | ------------------------------------------------- | 8 bits [31-24] | 1 bit [23] | 23 bits [22-00] | -------------------------------------------------

The formula to calculate N is: 

N = (-1^sign) * mantissa * 256^(exponent-3)

This compact form is only used in decred to encode unsigned 256-bit numbers which represent difficulty targets, thus there really is not a need for a sign bit, but it is implemented here to stay consistent with bitcoind.

Example

This example demonstrates how to convert the compact "bits" in a block header which represent the target difficulty to a big integer and display it using the typical hex notation. 

package main

import (
	"fmt"

	"github.com/decred/dcrd/blockchain"

	_ "github.com/decred/dcrd/database/ffldb"
)

func main() {
	// Convert the bits from block 300000 in the main Decred block chain.
	bits := uint32(419465580)
	targetDifficulty := blockchain.CompactToBig(bits)

	// Display it in hex.
	fmt.Printf("%064x\n", targetDifficulty.Bytes())

}

Output:

0000000000000000896c00000000000000000000000000000000000000000000

func ConvertUtxosToMinimalOutputs added in v0.5.0 

func ConvertUtxosToMinimalOutputs(entry *UtxoEntry) []*stake.MinimalOutput

ConvertUtxosToMinimalOutputs converts the contents of a UTX to a series of minimal outputs. It does this so that these can be passed to stake subpackage functions, where they will be evaluated for correctness.

func CountP2SHSigOps 

func CountP2SHSigOps(tx *dcrutil.Tx, isCoinBaseTx bool, isStakeBaseTx bool,
	utxoView *UtxoViewpoint) (int, error)

CountP2SHSigOps returns the number of signature operations for all input transactions which are of the pay-to-script-hash type. This uses the precise, signature operation counting mechanism from the script engine which requires access to the input transaction scripts.

func CountSigOps 

func CountSigOps(tx *dcrutil.Tx, isCoinBaseTx bool, isSSGen bool) int

CountSigOps returns the number of signature operations for all transaction input and output scripts in the provided transaction. This uses the quicker, but imprecise, signature operation counting mechanism from txscript.

func DBFetchBlockByHeight added in v0.5.0 

func DBFetchBlockByHeight(dbTx database.Tx, height int64) (*dcrutil.Block, error)

DBFetchBlockByHeight is the exported version of dbFetchBlockByHeight.

func DBFetchHeaderByHeight added in v0.5.0 

func DBFetchHeaderByHeight(dbTx database.Tx, height int64) (*wire.BlockHeader,
	error)

DBFetchHeaderByHeight is the exported version of dbFetchHeaderByHeight.

func DBMainChainHasBlock added in v0.5.0 

func DBMainChainHasBlock(dbTx database.Tx, hash *chainhash.Hash) bool

DBMainChainHasBlock is the exported version of dbMainChainHasBlock.

func DebugBlockHeaderString 

func DebugBlockHeaderString(chainParams *chaincfg.Params,
	block *dcrutil.Block) string

DebugBlockHeaderString dumps a verbose message containing information about the block header of a block.

func DebugBlockString 

func DebugBlockString(block *dcrutil.Block) string

DebugBlockString dumps a verbose message containing information about the transactions of a block.

func DebugMsgTxString 

func DebugMsgTxString(msgTx *wire.MsgTx) string

DebugMsgTxString dumps a verbose message containing information about the contents of a transaction.

func DebugStxoData added in v0.5.0 

func DebugStxoData(stx *spentTxOut) string

DebugStxoData returns a string containing information about the data stored in the given STXO.

func DebugStxosData added in v0.5.0 

func DebugStxosData(stxs []spentTxOut) string

DebugStxosData returns a string containing information about the data stored in the given slice of STXOs.

func DebugUtxoEntryData added in v0.5.0 

func DebugUtxoEntryData(hash chainhash.Hash, utx *UtxoEntry) string

DebugUtxoEntryData returns a string containing information about the data stored in the given UtxoEntry.

func DebugUtxoViewpointData added in v0.5.0 

func DebugUtxoViewpointData(uv *UtxoViewpoint) string

DebugUtxoViewpointData returns a string containing information about the data stored in the given UtxoView.

func DisableLog 

func DisableLog()

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

func DumpBlockChain added in v0.5.0 

func DumpBlockChain(db database.DB, height int64) (map[int64][]byte, error)

DumpBlockChain dumps the blockchain to a map of height --> serialized bytes. Mainly used for generating tests.

func HashMerkleBranches 

func HashMerkleBranches(left *chainhash.Hash, right *chainhash.Hash) *chainhash.Hash

HashMerkleBranches takes two hashes, treated as the left and right tree nodes, and returns the hash of their concatenation. This is a helper function used to aid in the generation of a merkle tree.

func IsCoinBase 

func IsCoinBase(tx *dcrutil.Tx) bool

IsCoinBase determines whether or not a transaction is a coinbase. A coinbase is a special transaction created by miners that has no inputs. This is represented in the block chain by a transaction with a single input that has a previous output transaction index set to the maximum value along with a zero hash.

This function only differs from IsCoinBaseTx in that it works with a higher level util transaction as opposed to a raw wire transaction.

func IsCoinBaseTx 

func IsCoinBaseTx(msgTx *wire.MsgTx) bool

IsCoinBaseTx determines whether or not a transaction is a coinbase. A coinbase is a special transaction created by miners that has no inputs. This is represented in the block chain by a transaction with a single input that has a previous output transaction index set to the maximum value along with a zero hash.

This function only differs from IsCoinBase in that it works with a raw wire transaction as opposed to a higher level util transaction.

func IsFinalizedTransaction 

func IsFinalizedTransaction(tx *dcrutil.Tx, blockHeight int64,
	blockTime time.Time) bool

IsFinalizedTransaction determines whether or not a transaction is finalized.

func SetLogWriter 

func SetLogWriter(w io.Writer, level string) error

SetLogWriter uses a specified io.Writer to output package logging info. This allows a caller to direct package logging output without needing a dependency on seelog. If the caller is also using btclog, UseLogger should be used instead.

func ShaHashToBig 

func ShaHashToBig(hash *chainhash.Hash) *big.Int

ShaHashToBig converts a wire.ShaHash into a big.Int that can be used to perform math comparisons.

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.

func ValidateTransactionScripts 

func ValidateTransactionScripts(tx *dcrutil.Tx, utxoView *UtxoViewpoint, flags txscript.ScriptFlags, sigCache *txscript.SigCache) error

ValidateTransactionScripts validates the scripts for the passed transaction using multiple goroutines.

Types

type AssertError added in v0.5.0 

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 added in v0.5.0 

func (e AssertError) Error() string

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

type BehaviorFlags 

type BehaviorFlags uint32

BehaviorFlags is a bitmask defining tweaks to the normal behavior when performing chain processing and consensus rules checks. 

const (
	// BFFastAdd may be set to indicate that several checks can be avoided
	// for the block since it is already known to fit into the chain due to
	// already proving it correct links into the chain up to a known
	// checkpoint.  This is primarily used for headers-first mode.
	BFFastAdd BehaviorFlags = 1 << iota

	// BFNoPoWCheck may be set to indicate the proof of work check which
	// ensures a block hashes to a value less than the required target will
	// not be performed.
	BFNoPoWCheck

	// BFDryRun may be set to indicate the block should not modify the chain
	// or memory chain index.  This is useful to test that a block is valid
	// without modifying the current state.
	BFDryRun

	// BFNone is a convenience value to specifically indicate no flags.
	BFNone BehaviorFlags = 0
)

type BestState added in v0.5.0 

type BestState struct {
	Hash         *chainhash.Hash // The hash of the block.
	Height       int64           // The height of the block.
	Bits         uint32          // The difficulty bits of the block.
	BlockSize    uint64          // The size of the block.
	NumTxns      uint64          // The number of txns in the block.
	TotalTxns    uint64          // The total number of txns in the chain.
	TotalSubsidy int64           // The total subsidy for the chain.
}

BestState houses information about the current best block and other info related to the state of the main chain as it exists from the point of view of the current best block.

The BestSnapshot method can be used to obtain access to this information in a concurrent safe manner and the data will not be changed out from under the caller when chain state changes occur as the function name implies. However, the returned snapshot must be treated as immutable since it is shared by all callers.

type BlockAcceptedNtfnsData 

type BlockAcceptedNtfnsData struct {
	OnMainChain bool
	Block       *dcrutil.Block
}

BlockAcceptedNtfnsData is the structure for data indicating information about a block being accepted.

type BlockChain 

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

BlockChain provides functions for working with the Decred block chain. It includes functionality such as rejecting duplicate blocks, ensuring blocks follow all rules, orphan handling, checkpoint handling, and best chain selection with reorganization.

func New 

func New(config *Config) (*BlockChain, error)

New returns a BlockChain instance using the provided configuration details.

func (*BlockChain) BestBlockHeader added in v0.5.0 

func (b *BlockChain) BestBlockHeader() *wire.BlockHeader

BestBlockHeader returns a copy of the block header of the block at HEAD.

This function is NOT safe for concurrent access.

func (*BlockChain) BestSnapshot added in v0.5.0 

func (b *BlockChain) BestSnapshot() *BestState

BestSnapshot returns information about the current best chain block and related state as of the current point in time. The returned instance must be treated as immutable since it is shared by all callers.

This function is safe for concurrent access.

func (*BlockChain) BlockByHash added in v0.5.0 

func (b *BlockChain) BlockByHash(hash *chainhash.Hash) (*dcrutil.Block, error)

BlockByHash returns the block from the main chain with the given hash with the appropriate chain height set.

This function is safe for concurrent access.

func (*BlockChain) BlockByHeight added in v0.5.0 

func (b *BlockChain) BlockByHeight(blockHeight int64) (*dcrutil.Block, error)

BlockByHeight returns the block at the given height in the main chain.

This function is safe for concurrent access.

func (*BlockChain) BlockHashByHeight added in v0.5.0 

func (b *BlockChain) BlockHashByHeight(blockHeight int64) (*chainhash.Hash,
	error)

BlockHashByHeight returns the hash of the block at the given height in the main chain.

This function is safe for concurrent access.

func (*BlockChain) BlockHeightByHash added in v0.5.0 

func (b *BlockChain) BlockHeightByHash(hash *chainhash.Hash) (int64, error)

BlockHeightByHash returns the height of the block with the given hash in the main chain.

This function is safe for concurrent access.

func (*BlockChain) BlockLocatorFromHash 

func (b *BlockChain) BlockLocatorFromHash(hash *chainhash.Hash) BlockLocator

BlockLocatorFromHash returns a block locator for the passed block hash. See BlockLocator for details on the algorithm used to create a block locator.

In addition to the general algorithm referenced above, there are a couple of special cases which are handled:

  • If the genesis hash is passed, there are no previous hashes to add and therefore the block locator will only consist of the genesis hash
  • If the passed hash is not currently known, the block locator will only consist of the passed hash

This function is safe for concurrent access.

func (*BlockChain) CalcNextRequiredDiffFromNode 

func (b *BlockChain) CalcNextRequiredDiffFromNode(hash *chainhash.Hash,
	timestamp time.Time) (uint32, error)

CalcNextRequiredDiffFromNode calculates the required difficulty for the block given with the passed hash along with the given timestamp.

This function is NOT safe for concurrent access.

func (*BlockChain) CalcNextRequiredDifficulty 

func (b *BlockChain) CalcNextRequiredDifficulty(timestamp time.Time) (uint32,
	error)

CalcNextRequiredDifficulty calculates the required difficulty for the block after the end of the current best chain based on the difficulty retarget rules.

This function is safe for concurrent access.

func (*BlockChain) CalcNextRequiredStakeDifficulty 

func (b *BlockChain) CalcNextRequiredStakeDifficulty() (int64, error)

CalcNextRequiredStakeDifficulty is the exported version of the above function. This function is NOT safe for concurrent access.

func (*BlockChain) CalcPastMedianTime 

func (b *BlockChain) CalcPastMedianTime() (time.Time, error)

CalcPastMedianTime calculates the median time of the previous few blocks prior to, and including, the end of the current best chain. It is primarily used to ensure new blocks have sane timestamps.

This function is safe for concurrent access.

func (*BlockChain) CheckBlockStakeSanity 

func (b *BlockChain) CheckBlockStakeSanity(stakeValidationHeight int64, node *blockNode, block *dcrutil.Block, parent *dcrutil.Block, chainParams *chaincfg.Params) error

CheckBlockStakeSanity performs a series of checks on a block to ensure that the information from the block's header about stake is sane. For instance, the number of SSGen tx must be equal to voters. TODO: We can consider breaking this into two functions and making some of these checks go through in processBlock, however if a block has demonstrable PoW it seems unlikely that it will have stake errors (because the miner is then just wasting hash power).

func (*BlockChain) CheckConnectBlock 

func (b *BlockChain) CheckConnectBlock(block *dcrutil.Block) error

CheckConnectBlock performs several checks to confirm connecting the passed block to the main chain does not violate any rules. An example of some of the checks performed are ensuring connecting the block would not cause any duplicate transaction hashes for old transactions that aren't already fully spent, double spends, exceeding the maximum allowed signature operations per block, invalid values in relation to the expected block subsidy, or fail transaction script validation.

This function is safe for concurrent access.

func (*BlockChain) CheckExpiredTicket added in v0.5.0 

func (b *BlockChain) CheckExpiredTicket(hash chainhash.Hash) bool

CheckExpiredTicket returns whether or not a ticket was ever expired.

This function is safe for concurrent access.

func (*BlockChain) CheckExpiredTickets added in v0.5.0 

func (b *BlockChain) CheckExpiredTickets(hashes []chainhash.Hash) []bool

CheckExpiredTickets returns whether or not a ticket in a slice of tickets was ever expired.

This function is safe for concurrent access.

func (*BlockChain) CheckLiveTicket added in v0.0.4 

func (b *BlockChain) CheckLiveTicket(hash chainhash.Hash) bool

CheckLiveTicket returns whether or not a ticket exists in the live ticket treap of the best node.

This function is safe for concurrent access.

func (*BlockChain) CheckLiveTickets added in v0.0.4 

func (b *BlockChain) CheckLiveTickets(hashes []chainhash.Hash) []bool

CheckLiveTickets returns whether or not a slice of tickets exist in the live ticket treap of the best node.

This function is safe for concurrent access.

func (*BlockChain) Checkpoints 

func (b *BlockChain) Checkpoints() []chaincfg.Checkpoint

Checkpoints returns a slice of checkpoints (regardless of whether they are already known). When checkpoints are disabled or there are no checkpoints for the active network, it will return nil.

This function is safe for concurrent access.

func (*BlockChain) DisableCheckpoints 

func (b *BlockChain) DisableCheckpoints(disable bool)

DisableCheckpoints provides a mechanism to disable validation against checkpoints which you DO NOT want to do in production. It is provided only for debug purposes.

This function is safe for concurrent access.

func (*BlockChain) DisableVerify 

func (b *BlockChain) DisableVerify(disable bool)

DisableVerify provides a mechanism to disable transaction script validation which you DO NOT want to do in production as it could allow double spends and other undesirable things. It is provided only for debug purposes since script validation is extremely intensive and when debugging it is sometimes nice to quickly get the chain.

This function is safe for concurrent access.

func (*BlockChain) DoStxoTest added in v0.5.0 

func (b *BlockChain) DoStxoTest() error

DoStxoTest does a test on a simulated blockchain to ensure that the data stored in the STXO buckets is not corrupt.

func (*BlockChain) EstimateNextStakeDifficulty added in v0.1.2 

func (b *BlockChain) EstimateNextStakeDifficulty(ticketsInWindow int64,
	useMaxTickets bool) (int64, error)

EstimateNextStakeDifficulty is the exported version of the above function. This function is NOT safe for concurrent access.

func (*BlockChain) FetchBlockFromHash added in v0.5.0 

func (b *BlockChain) FetchBlockFromHash(hash *chainhash.Hash) (*dcrutil.Block,
	error)

FetchBlockFromHash is the generalized and exported version of fetchBlockFromHash. It is safe for concurrent access.

func (*BlockChain) FetchSubsidyCache added in v0.5.0 

func (b *BlockChain) FetchSubsidyCache() *SubsidyCache

FetchSubsidyCache returns the current subsidy cache from the blockchain.

This function is safe for concurrent access.

func (*BlockChain) FetchUtxoEntry added in v0.5.0 

func (b *BlockChain) FetchUtxoEntry(txHash *chainhash.Hash) (*UtxoEntry, error)

FetchUtxoEntry loads and returns the unspent transaction output entry for the passed hash from the point of view of the end of the main chain.

NOTE: Requesting a hash for which there is no data will NOT return an error. Instead both the entry and the error will be nil. This is done to allow pruning of fully spent transactions. In practice this means the caller must check if the returned entry is nil before invoking methods on it.

This function is safe for concurrent access however the returned entry (if any) is NOT.

func (*BlockChain) FetchUtxoView added in v0.5.0 

func (b *BlockChain) FetchUtxoView(tx *dcrutil.Tx, treeValid bool) (*UtxoViewpoint,
	error)

FetchUtxoView loads utxo details about the input transactions referenced by the passed transaction from the point of view of the end of the main chain. It also attempts to fetch the utxo details for the transaction itself so the returned view can be examined for duplicate unspent transaction outputs.

This function is safe for concurrent access however the returned view is NOT.

func (*BlockChain) ForceHeadReorganization 

func (b *BlockChain) ForceHeadReorganization(formerBest chainhash.Hash,
	newBest chainhash.Hash, timeSource MedianTimeSource) error

ForceHeadReorganization is the exported version of forceHeadReorganization.

func (*BlockChain) GetGeneration 

func (b *BlockChain) GetGeneration(hash chainhash.Hash) ([]chainhash.Hash, error)

GetGeneration is the exported version of getGeneration.

func (*BlockChain) GetOrphanRoot 

func (b *BlockChain) GetOrphanRoot(hash *chainhash.Hash) *chainhash.Hash

GetOrphanRoot returns the head of the chain for the provided hash from the map of orphan blocks.

This function is safe for concurrent access.

func (*BlockChain) GetTopBlock 

func (b *BlockChain) GetTopBlock() (*dcrutil.Block, error)

GetTopBlock returns the current block at HEAD on the blockchain. Needed for mining in the daemon.

func (*BlockChain) HaveBlock 

func (b *BlockChain) HaveBlock(hash *chainhash.Hash) (bool, error)

HaveBlock returns whether or not the chain instance has the block represented by the passed hash. This includes checking the various places a block can be like part of the main chain, on a side chain, or in the orphan pool.

This function is safe for concurrent access.

func (*BlockChain) HeaderByHeight added in v0.5.0 

func (b *BlockChain) HeaderByHeight(height int64) (*wire.BlockHeader, error)

HeaderByHeight is the exported version of dbFetchHeaderByHeight that internally creates a database transaction to do the lookup.

func (*BlockChain) HeightRange added in v0.5.0 

func (b *BlockChain) HeightRange(startHeight, endHeight int64) ([]chainhash.Hash,
	error)

HeightRange returns a range of block hashes for the given start and end heights. It is inclusive of the start height and exclusive of the end height. The end height will be limited to the current main chain height.

This function is safe for concurrent access.

func (*BlockChain) IsCheckpointCandidate 

func (b *BlockChain) IsCheckpointCandidate(block *dcrutil.Block) (bool, error)

IsCheckpointCandidate returns whether or not the passed block is a good checkpoint candidate.

The factors used to determine a good checkpoint are:

  • The block must be in the main chain
  • The block must be at least 'CheckpointConfirmations' blocks prior to the current end of the main chain
  • The timestamps for the blocks before and after the checkpoint must have timestamps which are also before and after the checkpoint, respectively (due to the median time allowance this is not always the case)
  • The block must not contain any strange transaction such as those with nonstandard scripts

The intent is that candidates are reviewed by a developer to make the final decision and then manually added to the list of checkpoints for a network.

This function is safe for concurrent access.

func (*BlockChain) IsCurrent 

func (b *BlockChain) IsCurrent(timeSource MedianTimeSource) bool

IsCurrent returns whether or not the chain believes it is current. Several factors are used to guess, but the key factors that allow the chain to believe it is current are:

  • Latest block height is after the latest checkpoint (if enabled)
  • Latest block has a timestamp newer than 24 hours ago

This function is safe for concurrent access.

func (*BlockChain) IsKnownOrphan 

func (b *BlockChain) IsKnownOrphan(hash *chainhash.Hash) bool

IsKnownOrphan returns whether the passed hash is currently a known orphan. Keep in mind that only a limited number of orphans are held onto for a limited amount of time, so this function must not be used as an absolute way to test if a block is an orphan block. A full block (as opposed to just its hash) must be passed to ProcessBlock for that purpose. However, calling ProcessBlock with an orphan that already exists results in an error, so this function provides a mechanism for a caller to intelligently detect *recent* duplicate orphans and react accordingly.

This function is safe for concurrent access.

func (*BlockChain) LatestBlockLocator 

func (b *BlockChain) LatestBlockLocator() (BlockLocator, error)

LatestBlockLocator returns a block locator for the latest known tip of the main (best) chain.

This function is safe for concurrent access.

func (*BlockChain) LatestCheckpoint 

func (b *BlockChain) LatestCheckpoint() *chaincfg.Checkpoint

LatestCheckpoint returns the most recent checkpoint (regardless of whether it is already known). When checkpoints are disabled or there are no checkpoints for the active network, it will return nil.

This function is safe for concurrent access.

func (*BlockChain) LiveTickets added in v0.0.10 

func (b *BlockChain) LiveTickets() ([]chainhash.Hash, error)

LiveTickets returns all currently live tickets from the stake database.

This function is NOT safe for concurrent access.

func (*BlockChain) LotteryDataForBlock added in v0.5.0 

func (b *BlockChain) LotteryDataForBlock(hash *chainhash.Hash) ([]chainhash.Hash, int, [6]byte, error)

LotteryDataForBlock returns lottery data for a given block in the block chain, including side chain blocks.

It is safe for concurrent access. TODO An optimization can be added that only calls the read lock if the 

block is not minMemoryStakeNodes blocks before the current best node.
This is because all the data for these nodes can be assumed to be
in memory.

func (*BlockChain) MainChainHasBlock added in v0.5.0 

func (b *BlockChain) MainChainHasBlock(hash *chainhash.Hash) (bool, error)

MainChainHasBlock returns whether or not the block with the given hash is in the main chain.

This function is safe for concurrent access.

func (*BlockChain) MissedTickets 

func (b *BlockChain) MissedTickets() ([]chainhash.Hash, error)

MissedTickets returns all currently missed tickets from the stake database.

This function is NOT safe for concurrent access.

func (*BlockChain) NextLotteryData added in v0.5.0 

func (b *BlockChain) NextLotteryData() ([]chainhash.Hash, int, [6]byte, error)

NextLotteryData returns the next tickets eligible for spending as SSGen on the top block. It also returns the ticket pool size and the PRNG state checksum.

This function is safe for concurrent access.

func (*BlockChain) ProcessBlock 

func (b *BlockChain) ProcessBlock(block *dcrutil.Block,
	timeSource MedianTimeSource, flags BehaviorFlags) (bool, bool, error)

ProcessBlock is the main workhorse for handling insertion of new blocks into the block chain. It includes functionality such as rejecting duplicate blocks, ensuring blocks follow all rules, orphan handling, and insertion into the block chain along with best chain selection and reorganization.

It returns a first bool specifying whether or not the block is on on a fork or on a side chain. True means it's on the main chain.

This function is safe for concurrent access.

Example

This example demonstrates how to create a new chain instance and use ProcessBlock to attempt to attempt add a block to the chain. As the package overview documentation describes, this includes all of the Decred consensus rules. This example intentionally attempts to insert a duplicate genesis block to illustrate how an invalid block is handled. 

package main

import (
	"fmt"
	"os"
	"path/filepath"

	"github.com/decred/dcrd/blockchain"
	"github.com/decred/dcrd/chaincfg"
	"github.com/decred/dcrd/database"
	"github.com/decred/dcrutil"

	_ "github.com/decred/dcrd/database/ffldb"
)

func main() {
	// Create a new database to store the accepted blocks into.  Typically
	// this would be opening an existing database and would not be deleting
	// and creating a new database like this, but it is done here so this is
	// a complete working example and does not leave temporary files laying
	// around.
	dbPath := filepath.Join(os.TempDir(), "exampleprocessblock")
	_ = os.RemoveAll(dbPath)
	db, err := database.Create("ffldb", dbPath, chaincfg.MainNetParams.Net)
	if err != nil {
		fmt.Printf("Failed to create database: %v\n", err)
		return
	}
	defer os.RemoveAll(dbPath)
	defer db.Close()

	// Create a new BlockChain instance using the underlying database for
	// the main bitcoin network.  This example does not demonstrate some
	// of the other available configuration options such as specifying a
	// notification callback and signature cache.
	chain, err := blockchain.New(&blockchain.Config{
		DB:          db,
		ChainParams: &chaincfg.MainNetParams,
	})
	if err != nil {
		fmt.Printf("Failed to create chain instance: %v\n", err)
		return
	}

	// Create a new median time source that is required by the upcoming
	// call to ProcessBlock.  Ordinarily this would also add time values
	// obtained from other peers on the network so the local time is
	// adjusted to be in agreement with other peers.
	timeSource := blockchain.NewMedianTime()

	// Create a new BlockChain instance using the underlying database for
	// the main bitcoin network.  This example does not demonstrate some
	// of the other available configuration options such as specifying a
	// notification callback and signature cache.
	genesisBlock := dcrutil.NewBlock(chaincfg.MainNetParams.GenesisBlock)
	_, isOrphan, err := chain.ProcessBlock(genesisBlock, timeSource, blockchain.BFNone)
	if err != nil {
		fmt.Printf("Failed to create chain instance: %v\n", err)
		return
	}
	fmt.Printf("Block accepted. Is it an orphan?: %v", isOrphan)

	// This output is dependent on the genesis block, and needs to be
	// updated if the mainnet genesis block is updated.
	

Output:

func (*BlockChain) TicketPoolValue added in v0.0.8 

func (b *BlockChain) TicketPoolValue() (dcrutil.Amount, error)

TicketPoolValue returns the current value of all the locked funds in the ticket pool.

This function is safe for concurrent access. All live tickets are at least 256 blocks deep on mainnet, so the UTXO set should generally always have the asked for transactions.

func (*BlockChain) TicketsWithAddress 

func (b *BlockChain) TicketsWithAddress(address dcrutil.Address) ([]chainhash.Hash, error)

TicketsWithAddress returns a slice of ticket hashes that are currently live corresponding to the given address.

This function is safe for concurrent access.

func (*BlockChain) TotalSubsidy added in v0.5.0 

func (b *BlockChain) TotalSubsidy() int64

TotalSubsidy returns the total subsidy mined so far in the best chain.

This function is safe for concurrent access.

type BlockLocator 

type BlockLocator []*chainhash.Hash

BlockLocator is used to help locate a specific block. The algorithm for building the block locator is to add the hashes in reverse order until the genesis block is reached. In order to keep the list of locator hashes to a reasonable number of entries, first the most recent previous 10 block hashes are added, then the step is doubled each loop iteration to exponentially decrease the number of hashes as a function of the distance from the block being located.

For example, assume you have a block chain with a side chain as depicted below: 

genesis -> 1 -> 2 -> ... -> 15 -> 16  -> 17  -> 18
                              \-> 16a -> 17a

The block locator for block 17a would be the hashes of blocks: [17a 16a 15 14 13 12 11 10 9 8 6 2 genesis]

type Config added in v0.5.0 

type Config struct {
	// DB defines the database which houses the blocks and will be used to
	// store all metadata created by this package such as the utxo set.
	//
	// This field is required.
	DB database.DB

	// ChainParams identifies which chain parameters the chain is associated
	// with.
	//
	// This field is required.
	ChainParams *chaincfg.Params

	// Notifications defines a callback to which notifications will be sent
	// when various events take place.  See the documentation for
	// Notification and NotificationType for details on the types and
	// contents of notifications.
	//
	// This field can be nil if the caller is not interested in receiving
	// notifications.
	Notifications NotificationCallback

	// SigCache defines a signature cache to use when when validating
	// signatures.  This is typically most useful when individual
	// transactions are already being validated prior to their inclusion in
	// a block such as what is usually done via a transaction memory pool.
	//
	// This field can be nil if the caller is not interested in using a
	// signature cache.
	SigCache *txscript.SigCache

	// IndexManager defines an index manager to use when initializing the
	// chain and connecting and disconnecting blocks.
	//
	// This field can be nil if the caller does not wish to make use of an
	// index manager.
	IndexManager IndexManager
}

Config is a descriptor which specifies the blockchain instance configuration.

type ErrorCode 

type ErrorCode int

ErrorCode identifies a kind of error. 

const (
	// ErrDuplicateBlock indicates a block with the same hash already
	// exists.
	ErrDuplicateBlock ErrorCode = iota

	// ErrMissingParent indicates that the block was an orphan.
	ErrMissingParent

	// ErrBlockTooBig indicates the serialized block size exceeds the
	// maximum allowed size.
	ErrBlockTooBig

	// ErrWrongBlockSize indicates that the block size from the header was
	// not the actual serialized size of the block.
	ErrWrongBlockSize

	// ErrBlockVersionTooOld indicates the block version is too old and is
	// no longer accepted since the majority of the network has upgraded
	// to a newer version.
	ErrBlockVersionTooOld

	// ErrInvalidTime indicates the time in the passed block has a precision
	// that is more than one second.  The chain consensus rules require
	// timestamps to have a maximum precision of one second.
	ErrInvalidTime

	// ErrTimeTooOld indicates the time is either before the median time of
	// the last several blocks per the chain consensus rules or prior to the
	// most recent checkpoint.
	ErrTimeTooOld

	// ErrTimeTooNew indicates the time is too far in the future as compared
	// the current time.
	ErrTimeTooNew

	// ErrDifficultyTooLow indicates the difficulty for the block is lower
	// than the difficulty required by the most recent checkpoint.
	ErrDifficultyTooLow

	// ErrUnexpectedDifficulty indicates specified bits do not align with
	// the expected value either because it doesn't match the calculated
	// valued based on difficulty regarted rules or it is out of the valid
	// range.
	ErrUnexpectedDifficulty

	// ErrHighHash indicates the block does not hash to a value which is
	// lower than the required target difficultly.
	ErrHighHash

	// ErrBadMerkleRoot indicates the calculated merkle root does not match
	// the expected value.
	ErrBadMerkleRoot

	// ErrBadCheckpoint indicates a block that is expected to be at a
	// checkpoint height does not match the expected one.
	ErrBadCheckpoint

	// ErrForkTooOld indicates a block is attempting to fork the block chain
	// before the most recent checkpoint.
	ErrForkTooOld

	// ErrCheckpointTimeTooOld indicates a block has a timestamp before the
	// most recent checkpoint.
	ErrCheckpointTimeTooOld

	// ErrNoTransactions indicates the block does not have a least one
	// transaction.  A valid block must have at least the coinbase
	// transaction.
	ErrNoTransactions

	// ErrTooManyTransactions indicates the block has more transactions than
	// are allowed.
	ErrTooManyTransactions

	// ErrNoTxInputs indicates a transaction does not have any inputs.  A
	// valid transaction must have at least one input.
	ErrNoTxInputs

	// ErrNoTxOutputs indicates a transaction does not have any outputs.  A
	// valid transaction must have at least one output.
	ErrNoTxOutputs

	// ErrTxTooBig indicates a transaction exceeds the maximum allowed size
	// when serialized.
	ErrTxTooBig

	// ErrBadTxOutValue indicates an output value for a transaction is
	// invalid in some way such as being out of range.
	ErrBadTxOutValue

	// ErrDuplicateTxInputs indicates a transaction references the same
	// input more than once.
	ErrDuplicateTxInputs

	// ErrBadTxInput indicates a transaction input is invalid in some way
	// such as referencing a previous transaction outpoint which is out of
	// range or not referencing one at all.
	ErrBadTxInput

	// ErrMissingTx indicates a transaction referenced by an input is
	// missing.
	ErrMissingTx

	// ErrUnfinalizedTx indicates a transaction has not been finalized.
	// A valid block may only contain finalized transactions.
	ErrUnfinalizedTx

	// ErrDuplicateTx indicates a block contains an identical transaction
	// (or at least two transactions which hash to the same value).  A
	// valid block may only contain unique transactions.
	ErrDuplicateTx

	// ErrOverwriteTx indicates a block contains a transaction that has
	// the same hash as a previous transaction which has not been fully
	// spent.
	ErrOverwriteTx

	// ErrImmatureSpend indicates a transaction is attempting to spend a
	// coinbase that has not yet reached the required maturity.
	ErrImmatureSpend

	// ErrDoubleSpend indicates a transaction is attempting to spend coins
	// that have already been spent.
	ErrDoubleSpend

	// ErrSpendTooHigh indicates a transaction is attempting to spend more
	// value than the sum of all of its inputs.
	ErrSpendTooHigh

	// ErrBadFees indicates the total fees for a block are invalid due to
	// exceeding the maximum possible value.
	ErrBadFees

	// ErrTooManySigOps indicates the total number of signature operations
	// for a transaction or block exceed the maximum allowed limits.
	ErrTooManySigOps

	// ErrFirstTxNotCoinbase indicates the first transaction in a block
	// is not a coinbase transaction.
	ErrFirstTxNotCoinbase

	// ErrCoinbaseHeight indicates that the encoded height in the coinbase
	// is incorrect.
	ErrCoinbaseHeight

	// ErrMultipleCoinbases indicates a block contains more than one
	// coinbase transaction.
	ErrMultipleCoinbases

	// ErrStakeTxInRegularTree indicates a stake transaction was found in
	// the regular transaction tree.
	ErrStakeTxInRegularTree

	// ErrRegTxInStakeTree indicates that a regular transaction was found in
	// the stake transaction tree.
	ErrRegTxInStakeTree

	// ErrBadCoinbaseScriptLen indicates the length of the signature script
	// for a coinbase transaction is not within the valid range.
	ErrBadCoinbaseScriptLen

	// ErrBadCoinbaseValue indicates the amount of a coinbase value does
	// not match the expected value of the subsidy plus the sum of all fees.
	ErrBadCoinbaseValue

	// ErrBadCoinbaseOutpoint indicates that the outpoint used by a coinbase
	// as input was non-null.
	ErrBadCoinbaseOutpoint

	// ErrBadCoinbaseFraudProof indicates that the fraud proof for a coinbase
	// input was non-null.
	ErrBadCoinbaseFraudProof

	// ErrBadCoinbaseAmountIn indicates that the AmountIn (=subsidy) for a
	// coinbase input was incorrect.
	ErrBadCoinbaseAmountIn

	// ErrBadStakebaseAmountIn indicates that the AmountIn (=subsidy) for a
	// stakebase input was incorrect.
	ErrBadStakebaseAmountIn

	// ErrBadStakebaseScriptLen indicates the length of the signature script
	// for a stakebase transaction is not within the valid range.
	ErrBadStakebaseScriptLen

	// ErrBadStakevaseScrVal indicates the signature script for a stakebase
	// transaction was not set to the network consensus value.
	ErrBadStakevaseScrVal

	// ErrScriptMalformed indicates a transaction script is malformed in
	// some way.  For example, it might be longer than the maximum allowed
	// length or fail to parse.
	ErrScriptMalformed

	// ErrScriptValidation indicates the result of executing transaction
	// script failed.  The error covers any failure when executing scripts
	// such signature verification failures and execution past the end of
	// the stack.
	ErrScriptValidation

	// ErrNotEnoughStake indicates that there was for some SStx in a given block,
	// the given SStx did not have enough stake to meet the network target.
	ErrNotEnoughStake

	// ErrStakeBelowMinimum indicates that for some SStx in a given block,
	// the given SStx had an amount of stake below the minimum network target.
	ErrStakeBelowMinimum

	// ErrNonstandardStakeTx indicates that a block contained a stake tx that
	// was not one of the allowed types of a stake transactions.
	ErrNonstandardStakeTx

	// ErrNotEnoughVotes indicates that a block contained less than a majority
	// of voters.
	ErrNotEnoughVotes

	// ErrTooManyVotes indicates that a block contained more than the maximum
	// allowable number of votes.
	ErrTooManyVotes

	// ErrFreshStakeMismatch indicates that a block's header contained a different
	// number of SStx as compared to what was found in the block.
	ErrFreshStakeMismatch

	// ErrTooManySStxs indicates that more than the allowed number of SStx was
	// found in a block.
	ErrTooManySStxs

	// ErrInvalidEarlyStakeTx indicates that a tx type other than SStx was found
	// in the stake tx tree before the period when stake validation begins, or
	// before the stake tx type could possibly be included in the block.
	ErrInvalidEarlyStakeTx

	// ErrTicketUnavailable indicates that a vote in the block spent a ticket
	// that could not be found.
	ErrTicketUnavailable

	// ErrVotesOnWrongBlock indicates that an SSGen voted on a block not the
	// block's parent, and so was ineligible for inclusion into that block.
	ErrVotesOnWrongBlock

	// ErrVotesMismatch indicates that the number of SSGen in the block was not
	// equivalent to the number of votes provided in the block header.
	ErrVotesMismatch

	// ErrIncongruentVotebit indicates that the first votebit in votebits was not
	// the same as that determined by the majority of voters in the SSGen tx
	// included in the block.
	ErrIncongruentVotebit

	// ErrInvalidSSRtx indicates than an SSRtx in a block could not be found to
	// have a valid missed sstx input as per the stake ticket database.
	ErrInvalidSSRtx

	// ErrInvalidRevNum indicates that the number of revocations from the
	// header was not the same as the number of SSRtx included in the block.
	ErrRevocationsMismatch

	// ErrTooManyRevocations indicates more revocations were found in a block
	// than were allowed.
	ErrTooManyRevocations

	// ErrSStxCommitment indicates that the propotional amounts from the inputs
	// of an SStx did not match those found in the commitment outputs.
	ErrSStxCommitment

	// ErrUnparseableSSGen indicates that the SSGen block vote or votebits data
	// was unparseable from the null data outputs.
	ErrUnparseableSSGen

	// ErrInvalidSSGenInput indicates that the input SStx to the SSGen tx was
	// invalid because it was not an SStx.
	ErrInvalidSSGenInput

	// ErrSSGenPayeeNum indicates that the number of payees from the referenced
	// SSGen's SStx was not the same as the number of the payees in the outputs
	// of the SSGen tx.
	ErrSSGenPayeeNum

	// ErrSSGenPayeeOuts indicates that the SSGen payee outputs were either not
	// the values that would be expected given the rewards and input amounts of
	// the original SStx, or that the SSGen addresses did not correctly correspond
	// to the null data outputs given in the originating SStx.
	ErrSSGenPayeeOuts

	// ErrSSGenSubsidy indicates that there was an error in the amount of subsidy
	// generated in the vote.
	ErrSSGenSubsidy

	// ErrSStxInImmature indicates that the OP_SSTX tagged output used as input
	// was not yet TicketMaturity many blocks old.
	ErrSStxInImmature

	// ErrSStxInScrType indicates that the input used in an sstx was not
	// pay-to-pubkeyhash or pay-to-script-hash, which is required. It can
	// be OP_SS* tagged, but it must be P2PKH or P2SH.
	ErrSStxInScrType

	// ErrInvalidSSRtxInput indicates that the input for the SSRtx was not from
	// an SStx.
	ErrInvalidSSRtxInput

	// ErrSSRtxPayeesMismatch means that the number of payees in an SSRtx was
	// not the same as the number of payees in the outputs of the input SStx.
	ErrSSRtxPayeesMismatch

	// ErrSSRtxPayees indicates that the SSRtx failed to pay out to the committed
	// addresses or amounts from the originating SStx.
	ErrSSRtxPayees

	// ErrTxSStxOutSpend indicates that a non SSGen or SSRtx tx attempted to spend
	// an OP_SSTX tagged output from an SStx.
	ErrTxSStxOutSpend

	// ErrRegTxSpendStakeOut indicates that a regular tx attempted to spend to
	// outputs tagged with stake tags, e.g. OP_SSTX.
	ErrRegTxSpendStakeOut

	// ErrInvalidFinalState indicates that the final state of the PRNG included
	// in the the block differed from the calculated final state.
	ErrInvalidFinalState

	// ErrPoolSize indicates an error in the ticket pool size for this block.
	ErrPoolSize

	// ErrForceReorgWrongChain indicates that a reroganization was attempted
	// to be forced, but the chain indicated was not mirrored by b.bestChain.
	ErrForceReorgWrongChain

	// ErrForceReorgMissingChild indicates that a reroganization was attempted
	// to be forced, but the child node to reorganize to could not be found.
	ErrForceReorgMissingChild

	// ErrBadStakebaseValue indicates that a block's stake tx tree has spent
	// more than it is allowed.
	ErrBadStakebaseValue

	// ErrDiscordantTxTree specifies that a given origin tx's content
	// indicated that it should exist in a different tx tree than the
	// one given in the TxIn outpoint.
	ErrDiscordantTxTree

	// ErrStakeFees indicates an error with the fees found in the stake
	// transaction tree.
	ErrStakeFees

	// ErrNoStakeTx indicates there were no stake transactions found in a
	// block after stake validation height.
	ErrNoStakeTx

	// ErrBadBlockHeight indicates that a block header's embedded block height
	// was different from where it was actually embedded in the block chain.
	ErrBadBlockHeight

	// ErrBlockOneTx indicates that block height 1 failed to correct generate
	// the block one premine transaction.
	ErrBlockOneTx

	// ErrBlockOneTx indicates that block height 1 coinbase transaction in
	// zero was incorrect in some way.
	ErrBlockOneInputs

	// ErrBlockOneOutputs indicates that block height 1 failed to incorporate
	// the ledger addresses correctly into the transaction's outputs.
	ErrBlockOneOutputs

	// ErrNoTax indicates that there was no tax present in the coinbase of a
	// block after height 1.
	ErrNoTax

	// ErrExpiredTx indicates that the transaction is currently expired.
	ErrExpiredTx

	// ErrExpiryTxSpentEarly indicates that an output from a transaction
	// that included an expiry field was spent before coinbase maturity
	// many blocks had passed in the blockchain.
	ErrExpiryTxSpentEarly

	// ErrFraudAmountIn indicates the witness amount given was fraudulent.
	ErrFraudAmountIn

	// ErrFraudBlockHeight indicates the witness block height given was fraudulent.
	ErrFraudBlockHeight

	// ErrFraudBlockIndex indicates the witness block index given was fraudulent.
	ErrFraudBlockIndex

	// ErrZeroValueOutputSpend indicates that a transaction attempted to spend a
	// zero value output.
	ErrZeroValueOutputSpend

	// ErrInvalidEarlyVoteBits indicates that a block before stake validation
	// height had an unallowed vote bits value.
	ErrInvalidEarlyVoteBits
)

These constants are used to identify a specific RuleError.

func (ErrorCode) String 

func (e ErrorCode) String() string

String returns the ErrorCode as a human-readable name.

type IndexManager added in v0.5.0 

type IndexManager interface {
	// Init is invoked during chain initialize in order to allow the index
	// manager to initialize itself and any indexes it is managing.
	Init(*BlockChain) error

	// ConnectBlock is invoked when a new block has been connected to the
	// main chain.
	ConnectBlock(database.Tx, *dcrutil.Block, *dcrutil.Block, *UtxoViewpoint) error

	// DisconnectBlock is invoked when a block has been disconnected from
	// the main chain.
	DisconnectBlock(database.Tx, *dcrutil.Block, *dcrutil.Block, *UtxoViewpoint) error
}

IndexManager provides a generic interface that the is called when blocks are connected and disconnected to and from the tip of the main chain for the purpose of supporting optional indexes.

type MedianTimeSource 

type MedianTimeSource interface {
	// AdjustedTime returns the current time adjusted by the median time
	// offset as calculated from the time samples added by AddTimeSample.
	AdjustedTime() time.Time

	// AddTimeSample adds a time sample that is used when determining the
	// median time of the added samples.
	AddTimeSample(id string, timeVal time.Time)

	// Offset returns the number of seconds to adjust the local clock based
	// upon the median of the time samples added by AddTimeData.
	Offset() time.Duration
}

MedianTimeSource provides a mechanism to add several time samples which are used to determine a median time which is then used as an offset to the local clock.

func NewMedianTime 

func NewMedianTime() MedianTimeSource

NewMedianTime returns a new instance of concurrency-safe implementation of the MedianTimeSource interface. The returned implementation contains the rules necessary for proper time handling in the chain consensus rules and expects the time samples to be added from the timestamp field of the version message received from remote peers that successfully connect and negotiate.

type Notification 

type Notification struct {
	Type NotificationType
	Data interface{}
}

Notification defines notification that is sent to the caller via the callback function provided during the call to New and consists of a notification type as well as associated data that depends on the type as follows:

  • NTBlockAccepted: *BlockAcceptedNtfnsData
  • NTBlockConnected: []*dcrutil.Block of len 2
  • NTBlockDisconnected: []*dcrutil.Block of len 2
  • NTReorganization: *ReorganizationNtfnsData
  • NTSpentAndMissedTickets: *TicketNotificationsData
  • NTNewTickets: *TicketNotificationsData

type NotificationCallback 

type NotificationCallback func(*Notification)

NotificationCallback is used for a caller to provide a callback for notifications about various chain events.

type NotificationType 

type NotificationType int

NotificationType represents the type of a notification message. 

const (
	// NTBlockAccepted indicates the associated block was accepted into
	// the block chain.  Note that this does not necessarily mean it was
	// added to the main chain.  For that, use NTBlockConnected.
	NTBlockAccepted NotificationType = iota

	// NTBlockConnected indicates the associated block was connected to the
	// main chain.
	NTBlockConnected

	// NTBlockDisconnected indicates the associated block was disconnected
	// from the main chain.
	NTBlockDisconnected

	// NTReorganization indicates that a blockchain reorganization is in
	// progress.
	NTReorganization

	// NTSpentAndMissedTickets indicates spent or missed tickets from a newly
	// accepted block.
	NTSpentAndMissedTickets

	// NTSpentAndMissedTickets indicates newly maturing tickets from a newly
	// accepted block.
	NTNewTickets
)

Constants for the type of a notification message.

func (NotificationType) String 

func (n NotificationType) String() string

String returns the NotificationType in human-readable form.

type ReorganizationNtfnsData 

type ReorganizationNtfnsData struct {
	OldHash   chainhash.Hash
	OldHeight int64
	NewHash   chainhash.Hash
	NewHeight int64
}

ReorganizationNtfnsData is the structure for data indicating information about a reorganization.

type RuleError 

type RuleError struct {
	ErrorCode   ErrorCode // Describes the kind of error
	Description string    // Human readable description of the issue
}

RuleError identifies a rule violation. It is used to indicate that processing of a block or transaction failed due to one of the many validation rules. The caller can use type assertions to determine if a failure was specifically due to a rule violation and access the ErrorCode field to ascertain the specific reason for the rule violation.

func (RuleError) Error 

func (e RuleError) Error() string

Error satisfies the error interface and prints human-readable errors.

func (RuleError) GetCode 

func (e RuleError) GetCode() ErrorCode

GetCode satisfies the error interface and prints human-readable errors.

type StakeViewpoint added in v0.5.0 

type StakeViewpoint int8

StakeViewpoint is the viewpoint of the blockchain depending on stake validation. There are five potential viewpoints we need to worry about.

type SubsidyCache added in v0.5.0 

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

SubsidyCache is a structure that caches calculated values of subsidy so that they're not constantly recalculated. The blockchain struct itself possesses a pointer to a preinitialized SubsidyCache.

func NewSubsidyCache added in v0.5.0 

func NewSubsidyCache(height int64, params *chaincfg.Params) *SubsidyCache

NewSubsidyCache initializes a new subsidy cache for a given height. It precalculates the values of the subsidy that are most likely to be seen by the client when it connects to the network.

func (*SubsidyCache) CalcBlockSubsidy added in v0.5.0 

func (s *SubsidyCache) CalcBlockSubsidy(height int64) int64

CalcBlockSubsidy returns the subsidy amount a block at the provided height should have. This is mainly used for determining how much the coinbase for newly generated blocks awards as well as validating the coinbase for blocks has the expected value.

Subsidy calculation for exponential reductions: 0 for i in range (0, height / ReductionInterval): 1 subsidy *= MulSubsidy 2 subsidy /= DivSubsidy

Safe for concurrent access.

type TicketNotificationsData 

type TicketNotificationsData struct {
	Hash            chainhash.Hash
	Height          int64
	StakeDifficulty int64
	TicketsSpent    []chainhash.Hash
	TicketsMissed   []chainhash.Hash
	TicketsNew      []chainhash.Hash
}

TicketNotificationsData is the structure for new/spent/missed ticket notifications at blockchain HEAD that are outgoing from chain.

type UtxoEntry added in v0.5.0 

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

UtxoEntry contains contextual information about an unspent transaction such as whether or not it is a coinbase transaction, which block it was found in, and the spent status of its outputs.

The struct is aligned for memory efficiency.

func (*UtxoEntry) AmountByIndex added in v0.5.0 

func (entry *UtxoEntry) AmountByIndex(outputIndex uint32) int64

AmountByIndex returns the amount of the provided output index.

Returns 0 if the output index references an output that does not exist either due to it being invalid or because the output is not part of the view due to previously being spent/pruned.

func (*UtxoEntry) BlockHeight added in v0.5.0 

func (entry *UtxoEntry) BlockHeight() int64

BlockHeight returns the height of the block containing the transaction the utxo entry represents.

func (*UtxoEntry) BlockIndex added in v0.5.0 

func (entry *UtxoEntry) BlockIndex() uint32

BlockIndex returns the height of the block containing the transaction the utxo entry represents.

func (*UtxoEntry) HasExpiry added in v0.5.0 

func (entry *UtxoEntry) HasExpiry() bool

HasExpiry returns the transaction expiry for the transaction that the utxo entry represents.

func (*UtxoEntry) IsCoinBase added in v0.5.0 

func (entry *UtxoEntry) IsCoinBase() bool

IsCoinBase returns whether or not the transaction the utxo entry represents is a coinbase.

func (*UtxoEntry) IsFullySpent added in v0.5.0 

func (entry *UtxoEntry) IsFullySpent() bool

IsFullySpent returns whether or not the transaction the utxo entry represents is fully spent.

func (*UtxoEntry) IsOutputSpent added in v0.5.0 

func (entry *UtxoEntry) IsOutputSpent(outputIndex uint32) bool

IsOutputSpent returns whether or not the provided output index has been spent based upon the current state of the unspent transaction output view the entry was obtained from.

Returns true if the output index references an output that does not exist either due to it being invalid or because the output is not part of the view due to previously being spent/pruned.

func (*UtxoEntry) PkScriptByIndex added in v0.5.0 

func (entry *UtxoEntry) PkScriptByIndex(outputIndex uint32) []byte

PkScriptByIndex returns the public key script for the provided output index.

Returns nil if the output index references an output that does not exist either due to it being invalid or because the output is not part of the view due to previously being spent/pruned.

func (*UtxoEntry) ScriptVersionByIndex added in v0.5.0 

func (entry *UtxoEntry) ScriptVersionByIndex(outputIndex uint32) uint16

ScriptVersionByIndex returns the public key script for the provided output index.

Returns 0 if the output index references an output that does not exist either due to it being invalid or because the output is not part of the view due to previously being spent/pruned.

func (*UtxoEntry) SpendOutput added in v0.5.0 

func (entry *UtxoEntry) SpendOutput(outputIndex uint32)

SpendOutput marks the output at the provided index as spent. Specifying an output index that does not exist will not have any effect.

func (*UtxoEntry) TransactionType added in v0.5.0 

func (entry *UtxoEntry) TransactionType() stake.TxType

TransactionType returns the transaction type of the transaction the utxo entry represents.

func (*UtxoEntry) TxVersion added in v0.5.0 

func (entry *UtxoEntry) TxVersion() int32

TxVersion returns the transaction version of the transaction the utxo represents.

type UtxoViewpoint added in v0.5.0 

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

UtxoViewpoint represents a view into the set of unspent transaction outputs from a specific point of view in the chain. For example, it could be for the end of the main chain, some point in the history of the main chain, or down a side chain.

The unspent outputs are needed by other transactions for things such as script validation and double spend prevention.

func NewUtxoViewpoint added in v0.5.0 

func NewUtxoViewpoint() *UtxoViewpoint

NewUtxoViewpoint returns a new empty unspent transaction output view.

func (*UtxoViewpoint) AddTxOuts added in v0.5.0 

func (view *UtxoViewpoint) AddTxOuts(tx *dcrutil.Tx, blockHeight int64,
	blockIndex uint32)

AddTxOuts adds all outputs in the passed transaction which are not provably unspendable to the view. When the view already has entries for any of the outputs, they are simply marked unspent. All fields will be updated for existing entries since it's possible it has changed during a reorg.

func (*UtxoViewpoint) BestHash added in v0.5.0 

func (view *UtxoViewpoint) BestHash() *chainhash.Hash

BestHash returns the hash of the best block in the chain the view currently respresents.

func (*UtxoViewpoint) Entries added in v0.5.0 

func (view *UtxoViewpoint) Entries() map[chainhash.Hash]*UtxoEntry

Entries returns the underlying map that stores of all the utxo entries.

func (*UtxoViewpoint) LookupEntry added in v0.5.0 

func (view *UtxoViewpoint) LookupEntry(txHash *chainhash.Hash) *UtxoEntry

LookupEntry returns information about a given transaction according to the current state of the view. It will return nil if the passed transaction hash does not exist in the view or is otherwise not available such as when it has been disconnected during a reorg.

func (*UtxoViewpoint) SetBestHash added in v0.5.0 

func (view *UtxoViewpoint) SetBestHash(hash *chainhash.Hash)

SetBestHash sets the hash of the best block in the chain the view currently respresents.

func (*UtxoViewpoint) SetStakeViewpoint added in v0.5.0 

func (view *UtxoViewpoint) SetStakeViewpoint(sv StakeViewpoint)

SetStakeViewpoint sets the stake viewpoint of the current UTXO state.

func (*UtxoViewpoint) StakeViewpoint added in v0.5.0 

func (view *UtxoViewpoint) StakeViewpoint() StakeViewpoint

StakeViewpoint returns the stake viewpoint of the current UTXO state.

Source Files

View all Source files

Directories

Path Synopsis
Package indexers implements optional block chain indexes.
 Package indexers implements optional block chain indexes.
internal
dbnamespace
Package dbnamespace contains constants that define the database namespaces for the purpose of the blockchain, so that external callers may easily access this data.
 Package dbnamespace contains constants that define the database namespaces for the purpose of the blockchain, so that external callers may easily access this data.
progresslog
Package stake contains code for all of dcrd's stake transaction chain handling and other portions related to the Proof-of-Stake (PoS) system.
 Package stake contains code for all of dcrd's stake transaction chain handling and other portions related to the Proof-of-Stake (PoS) system.
internal/dbnamespace
Package dbnamespace contains constants that define the database namespaces for the purpose of the blockchain, so that external callers may easily access this data.
 Package dbnamespace contains constants that define the database namespaces for the purpose of the blockchain, so that external callers may easily access this data.
internal/ticketdb
internal/tickettreap
Package tickettreap implements a treap data structure that is used to hold live tickets ordered by their key along with some associated data using a combination of binary search tree and heap semantics.
 Package tickettreap implements a treap data structure that is used to hold live tickets ordered by their key along with some associated data using a combination of binary search tree and heap semantics.

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