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Refactor Difficulty API logic

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junderw 2022-08-20 13:02:22 +09:00
parent 87c9f881c0
commit 3a4982c5e6
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1 changed files with 10 additions and 9 deletions
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19
backend/src/api/difficulty-adjustment.ts
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@ -25,6 +25,7 @@ export function calcDifficultyAdjustment(
const ESTIMATE_LAG_BLOCKS = 146; // For first 7.2% of epoch, don't estimate.
const EPOCH_BLOCK_LENGTH = 2016; // Bitcoin mainnet
const BLOCK_SECONDS_TARGET = 600; // Bitcoin mainnet
const TESTNET_MAX_BLOCK_SECONDS = 1200; // Bitcoin testnet
const diffSeconds = nowSeconds - DATime;
const blocksInEpoch = (blockHeight >= 0) ? blockHeight % EPOCH_BLOCK_LENGTH : 0;
@ -33,12 +34,11 @@ export function calcDifficultyAdjustment(
const nextRetargetHeight = (blockHeight >= 0) ? blockHeight + remainingBlocks : 0;
let difficultyChange = 0;
let timeAvgMins = 10;
let timeAvgSecs = BLOCK_SECONDS_TARGET;
// Only calculate the estimate once we have 7.2% of blocks in current epoch
if (blocksInEpoch >= ESTIMATE_LAG_BLOCKS) {
const secondsPerBlock = diffSeconds / blocksInEpoch;
timeAvgMins = secondsPerBlock / 60;
difficultyChange = (BLOCK_SECONDS_TARGET / secondsPerBlock - 1) * 100;
timeAvgSecs = diffSeconds / blocksInEpoch;
difficultyChange = (BLOCK_SECONDS_TARGET / timeAvgSecs - 1) * 100;
// Max increase is x4 (+300%)
if (difficultyChange > 300) {
difficultyChange = 300;
@ -53,16 +53,17 @@ export function calcDifficultyAdjustment(
// therefore the time between blocks will always be below 20 minutes (1200s).
let timeOffset = 0;
if (network === 'testnet') {
if (timeAvgMins > 20) {
timeAvgMins = 20;
if (timeAvgSecs > TESTNET_MAX_BLOCK_SECONDS) {
timeAvgSecs = TESTNET_MAX_BLOCK_SECONDS;
}
if (nowSeconds - latestBlockTimestamp + timeAvgMins * 60 > 1200) {
timeOffset = -Math.min(nowSeconds - latestBlockTimestamp, 1200) * 1000;
const secondsSinceLastBlock = nowSeconds - latestBlockTimestamp;
if (secondsSinceLastBlock + timeAvgSecs > TESTNET_MAX_BLOCK_SECONDS) {
timeOffset = -Math.min(secondsSinceLastBlock, TESTNET_MAX_BLOCK_SECONDS) * 1000;
}
}
const timeAvg = Math.floor(timeAvgMins * 60 * 1000);
const timeAvg = Math.floor(timeAvgSecs * 1000);
const remainingTime = remainingBlocks * timeAvg;
const estimatedRetargetDate = remainingTime + nowSeconds * 1000;