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rust-bitcoin-unsafe-fast
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Add testnet blockspacing rule

This commit is contained in:
Andrew Poelstra 2014-07-18 16:41:09 -07:00
parent 51038f5810
commit 73e8b542c0
2 changed files with 22 additions and 4 deletions
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25
src/blockdata/blockchain.rs
View File

@ -30,8 +30,9 @@ use std::kinds::marker;
use blockdata::block::{Block, BlockHeader};
use blockdata::transaction::Transaction;
use blockdata::constants::{DIFFCHANGE_INTERVAL, DIFFCHANGE_TIMESPAN, max_target, genesis_block};
use network::constants::Network;
use blockdata::constants::{DIFFCHANGE_INTERVAL, DIFFCHANGE_TIMESPAN,
TARGET_BLOCK_SPACING, max_target, genesis_block};
use network::constants::{Network, BitcoinTestnet};
use network::serialize::{Serializable, SerializeIter};
use util::BitArray;
use util::error::{BitcoinResult, BlockNotFound, DuplicateHash, PrevHashNotFound};
@ -491,9 +492,25 @@ impl Blockchain {
if target > max { target = max };
// Compactify (make expressible in the 8+24 nBits float format
satoshi_the_precision(&target)
} else {
// On non-diffchange blocks, Testnet has a rule that any 20-minute-long
// block intervals result the difficulty
} else if self.network == BitcoinTestnet &&
block.header.time > prev.block.header.time + 2*TARGET_BLOCK_SPACING {
max_target(self.network)
// On the other hand, if we are in Testnet and the block interval is less
// than 20 minutes, we need to scan backward to find a block for which the
// previous rule did not apply, to find the "real" difficulty.
} else if self.network == BitcoinTestnet {
// Scan back DIFFCHANGE_INTERVAL blocks
let mut scan = prev.clone();
while scan.height % DIFFCHANGE_INTERVAL != 0 &&
scan.required_difficulty == max_target(self.network) {
scan = scan.prev(&self.tree).unwrap();
}
scan.required_difficulty
// Otherwise just use the last block's difficulty
prev.required_difficulty
} else {
prev.required_difficulty
};
// Create node
let ret = Rc::new(BlockchainNode {

1
src/blockdata/constants.rs
View File

@ -33,6 +33,7 @@ use util::uint::Uint256;
pub static MAX_SEQUENCE: u32 = 0xFFFFFFFF;
pub static COIN_VALUE: u64 = 100000000;
pub static TARGET_BLOCK_SPACING: u32 = 600;
pub static DIFFCHANGE_INTERVAL: u32 = 2016;
pub static DIFFCHANGE_TIMESPAN: u32 = 14 * 24 * 3600;