pub(crate) struct AdjustedDifficulty {
candidate_time: DateTime<Utc>,
candidate_height: Height,
network: Network,
relevant_difficulty_thresholds: Vec<CompactDifficulty>,
relevant_times: Vec<DateTime<Utc>>,
}
Expand description
Contains the context needed to calculate the adjusted difficulty for a block.
Fields§
§candidate_time: DateTime<Utc>
The header.time
field from the candidate block
candidate_height: Height
The coinbase height from the candidate block
If we only have the header, this field is calculated from the previous block height.
network: Network
The configured network
relevant_difficulty_thresholds: Vec<CompactDifficulty>
The header.difficulty_threshold
s from the previous
PoWAveragingWindow + PoWMedianBlockSpan
(28) blocks, in reverse height
order.
relevant_times: Vec<DateTime<Utc>>
The header.time
s from the previous
PoWAveragingWindow + PoWMedianBlockSpan
(28) blocks, in reverse height
order.
Only the first and last PoWMedianBlockSpan
times are used. Times
11..=16
are ignored.
Implementations§
source§impl AdjustedDifficulty
impl AdjustedDifficulty
sourcepub fn new_from_block<C>(
candidate_block: &Block,
network: &Network,
context: C,
) -> AdjustedDifficulty
pub fn new_from_block<C>( candidate_block: &Block, network: &Network, context: C, ) -> AdjustedDifficulty
Initialise and return a new AdjustedDifficulty
using a candidate_block
,
network
, and a context
.
The context
contains the previous
PoWAveragingWindow + PoWMedianBlockSpan
(28) difficulty_threshold
s and
time
s from the relevant chain for candidate_block
, in reverse height
order, starting with the previous block.
Note that the time
s might not be in reverse chronological order, because
block times are supplied by miners.
§Panics
If the context
contains fewer than 28 items.
sourcepub fn new_from_header_time<C>(
candidate_header_time: DateTime<Utc>,
previous_block_height: Height,
network: &Network,
context: C,
) -> AdjustedDifficulty
pub fn new_from_header_time<C>( candidate_header_time: DateTime<Utc>, previous_block_height: Height, network: &Network, context: C, ) -> AdjustedDifficulty
Initialise and return a new AdjustedDifficulty
using a
candidate_header_time
, previous_block_height
, network
, and a context
.
Designed for use when validating block headers, where the full block has not been downloaded yet.
See Self::new_from_block
for detailed information about the context
.
§Panics
If the context contains fewer than 28 items.
sourcepub fn candidate_height(&self) -> Height
pub fn candidate_height(&self) -> Height
Returns the candidate block’s height.
sourcepub fn candidate_time(&self) -> DateTime<Utc>
pub fn candidate_time(&self) -> DateTime<Utc>
Returns the candidate block’s time field.
sourcepub fn expected_difficulty_threshold(&self) -> CompactDifficulty
pub fn expected_difficulty_threshold(&self) -> CompactDifficulty
Calculate the expected difficulty_threshold
for a candidate block, based
on the candidate_time
, candidate_height
, network
, and the
difficulty_threshold
s and time
s from the previous
PoWAveragingWindow + PoWMedianBlockSpan
(28) blocks in the relevant chain.
Implements ThresholdBits
from the Zcash specification, and the Testnet
minimum difficulty adjustment from ZIPs 205 and 208.
sourcefn threshold_bits(&self) -> CompactDifficulty
fn threshold_bits(&self) -> CompactDifficulty
Calculate the difficulty_threshold
for a candidate block, based on the
candidate_height
, network
, and the relevant difficulty_threshold
s and
time
s.
See Self::expected_difficulty_threshold
for details.
Implements ThresholdBits
from the Zcash specification. (Which excludes the
Testnet minimum difficulty adjustment.)
sourcefn mean_target_difficulty(&self) -> ExpandedDifficulty
fn mean_target_difficulty(&self) -> ExpandedDifficulty
Calculate the arithmetic mean of the averaging window thresholds: the
expanded difficulty_threshold
s from the previous PoWAveragingWindow
(17)
blocks in the relevant chain.
Implements MeanTarget
from the Zcash specification.
sourcefn median_timespan_bounded(&self) -> Duration
fn median_timespan_bounded(&self) -> Duration
Calculate the bounded median timespan. The median timespan is the
difference of medians of the timespan times, which are the time
s from
the previous PoWAveragingWindow + PoWMedianBlockSpan
(28) blocks in the
relevant chain.
Uses the candidate block’s height' and
networkto calculate the
AveragingWindowTimespan` for that block.
The median timespan is damped by the PoWDampingFactor
, and bounded by
PoWMaxAdjustDown
and PoWMaxAdjustUp
.
Implements ActualTimespanBounded
from the Zcash specification.
Note: This calculation only uses PoWMedianBlockSpan
(11) times at the
start and end of the timespan times. timespan times [11..=16]
are ignored.
sourcefn median_timespan(&self) -> Duration
fn median_timespan(&self) -> Duration
Calculate the median timespan. The median timespan is the difference of
medians of the timespan times, which are the time
s from the previous
PoWAveragingWindow + PoWMedianBlockSpan
(28) blocks in the relevant chain.
Implements ActualTimespan
from the Zcash specification.
See Self::median_timespan_bounded
for details.
sourcepub fn median_time_past(&self) -> DateTime<Utc>
pub fn median_time_past(&self) -> DateTime<Utc>
Calculate the median of the time
s from the previous
PoWMedianBlockSpan
(11) blocks in the relevant chain.
Implements median-time-past
and MedianTime(candidate_height)
from the
Zcash specification. (These functions are identical, but they are
specified in slightly different ways.)
sourcepub(crate) fn median_time(
median_block_span_times: Vec<DateTime<Utc>>,
) -> DateTime<Utc>
pub(crate) fn median_time( median_block_span_times: Vec<DateTime<Utc>>, ) -> DateTime<Utc>
Calculate the median of the median_block_span_times
: the time
s from a
Vec of PoWMedianBlockSpan
(11) or fewer blocks in the relevant chain.
Implements MedianTime
from the Zcash specification.
§Panics
If provided an empty Vec
Auto Trait Implementations§
impl Freeze for AdjustedDifficulty
impl RefUnwindSafe for AdjustedDifficulty
impl Send for AdjustedDifficulty
impl Sync for AdjustedDifficulty
impl Unpin for AdjustedDifficulty
impl UnwindSafe for AdjustedDifficulty
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builds.