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mod error;
use byteorder::{ByteOrder, LittleEndian};
use ckb_types::{
core::{capacity_bytes, Capacity, Ratio, TransactionView},
packed::{Byte32, OutPoint},
prelude::*,
H160,
};
use std::collections::HashSet;
pub use crate::error::DaoError;
const DEFAULT_GENESIS_ACCUMULATE_RATE: u64 = 10_000_000_000_000_000;
#[doc(hidden)]
pub fn genesis_dao_data(txs: Vec<&TransactionView>) -> Result<Byte32, DaoError> {
genesis_dao_data_with_satoshi_gift(
txs,
&H160([0u8; 20]),
Ratio::new(1, 1),
capacity_bytes!(1_000_000),
capacity_bytes!(1000),
)
}
#[doc(hidden)]
pub fn genesis_dao_data_with_satoshi_gift(
txs: Vec<&TransactionView>,
satoshi_pubkey_hash: &H160,
satoshi_cell_occupied_ratio: Ratio,
initial_primary_issuance: Capacity,
initial_secondary_issuance: Capacity,
) -> Result<Byte32, DaoError> {
let dead_cells = txs
.iter()
.flat_map(|tx| tx.inputs().into_iter().map(|input| input.previous_output()))
.collect::<HashSet<_>>();
let statistics_outputs = |tx_index, tx: &TransactionView| -> Result<_, DaoError> {
let c = tx
.data()
.raw()
.outputs()
.into_iter()
.enumerate()
.filter(|(index, _)| !dead_cells.contains(&OutPoint::new(tx.hash(), *index as u32)))
.try_fold(Capacity::zero(), |capacity, (_, output)| {
let cap: Capacity = output.capacity().unpack();
capacity.safe_add(cap)
})?;
let u = tx
.outputs_with_data_iter()
.enumerate()
.filter(|(index, _)| !dead_cells.contains(&OutPoint::new(tx.hash(), *index as u32)))
.try_fold(Capacity::zero(), |capacity, (_, (output, data))| {
let occupied_capacity = if tx_index == 0
&& output.lock().args().raw_data() == satoshi_pubkey_hash.0[..]
{
Unpack::<Capacity>::unpack(&output.capacity())
.safe_mul_ratio(satoshi_cell_occupied_ratio)
} else {
Capacity::bytes(data.len()).and_then(|c| output.occupied_capacity(c))
};
occupied_capacity.and_then(|c| capacity.safe_add(c))
})?;
Ok((c, u))
};
let initial_issuance = initial_primary_issuance.safe_add(initial_secondary_issuance)?;
let result: Result<_, DaoError> = txs.into_iter().enumerate().try_fold(
(initial_issuance, Capacity::zero()),
|(c, u), (tx_index, tx)| {
let (tx_c, tx_u) = statistics_outputs(tx_index, tx)?;
let c = c.safe_add(tx_c)?;
let u = u.safe_add(tx_u)?;
Ok((c, u))
},
);
let (c, u) = result?;
if c == Capacity::zero() {
return Err(DaoError::ZeroC);
}
Ok(pack_dao_data(
DEFAULT_GENESIS_ACCUMULATE_RATE,
c,
initial_secondary_issuance,
u,
))
}
pub fn extract_dao_data(dao: Byte32) -> (u64, Capacity, Capacity, Capacity) {
let data = dao.raw_data();
let c = Capacity::shannons(LittleEndian::read_u64(&data[0..8]));
let ar = LittleEndian::read_u64(&data[8..16]);
let s = Capacity::shannons(LittleEndian::read_u64(&data[16..24]));
let u = Capacity::shannons(LittleEndian::read_u64(&data[24..32]));
(ar, c, s, u)
}
pub fn pack_dao_data(ar: u64, c: Capacity, s: Capacity, u: Capacity) -> Byte32 {
let mut buf = [0u8; 32];
LittleEndian::write_u64(&mut buf[0..8], c.as_u64());
LittleEndian::write_u64(&mut buf[8..16], ar);
LittleEndian::write_u64(&mut buf[16..24], s.as_u64());
LittleEndian::write_u64(&mut buf[24..32], u.as_u64());
Byte32::from_slice(&buf).expect("impossible: fail to read array")
}
mod tests {
pub use super::{extract_dao_data, pack_dao_data};
pub use ckb_types::core::Capacity;
pub use ckb_types::packed::Byte32;
pub use ckb_types::prelude::Pack;
pub use ckb_types::{h256, H256};
#[test]
#[allow(clippy::unreadable_literal)]
fn test_dao_data() {
let cases = vec![
(
h256!("0x8874337e541ea12e0000c16ff286230029bfa3320800000000710b00c0fefe06"),
10000000000000000,
Capacity::shannons(3360000145238488200),
Capacity::shannons(35209330473),
Capacity::shannons(504120308900000000),
),
(
h256!("0x10e9164f761ea12ea5f6ff75f28623007b7f682a0f00000000710b00c0fefe06"),
10000000104789669,
Capacity::shannons(3360000290476976400),
Capacity::shannons(65136000891),
Capacity::shannons(504120308900000000),
),
(
h256!("0x95b47fdcff26a42ed0fb76e081872300bb585ebd10a000000043c2f76b5eff06"),
10000616071298000,
Capacity::shannons(3360854102283105429),
Capacity::shannons(175993756997819),
Capacity::shannons(504225501100000000),
),
];
for (dao_h256, ar, c, s, u) in cases {
let dao_byte32: Byte32 = dao_h256.pack();
assert_eq!((ar, c, s, u), extract_dao_data(dao_byte32.clone()));
assert_eq!(dao_byte32, pack_dao_data(ar, c, s, u,));
}
}
}