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use crate::tx_verifier::OutputsDataVerifier;
use ckb_tool::ckb_error::Error as CKBError;
use ckb_tool::ckb_script::TransactionScriptsVerifier;
use ckb_tool::ckb_traits::{CellDataProvider, HeaderProvider};
use ckb_tool::ckb_types::{
bytes::Bytes,
core::{
cell::{CellMeta, CellMetaBuilder, ResolvedTransaction},
Capacity, Cycle, DepType, EpochExt, HeaderView, ScriptHashType, TransactionView,
},
packed::{Byte32, CellDep, CellOutput, OutPoint, Script},
prelude::*,
};
use linked_hash_set::LinkedHashSet;
use rand::{thread_rng, Rng};
use std::collections::HashMap;
pub fn random_hash() -> Byte32 {
let mut rng = thread_rng();
let mut buf = [0u8; 32];
rng.fill(&mut buf);
buf.pack()
}
pub fn random_out_point() -> OutPoint {
OutPoint::new_builder().tx_hash(random_hash()).build()
}
#[derive(Default)]
pub struct Context {
pub cells: HashMap<OutPoint, (CellOutput, Bytes)>,
pub headers: HashMap<Byte32, HeaderView>,
pub epoches: HashMap<Byte32, EpochExt>,
pub cells_by_data_hash: HashMap<Byte32, OutPoint>,
}
impl Context {
#[deprecated(since = "0.1.1", note = "Please use the deploy_cell function instead")]
pub fn deploy_contract(&mut self, data: Bytes) -> OutPoint {
self.deploy_cell(data)
}
pub fn deploy_cell(&mut self, data: Bytes) -> OutPoint {
let data_hash = CellOutput::calc_data_hash(&data);
if let Some(out_point) = self.cells_by_data_hash.get(&data_hash) {
return out_point.to_owned();
}
let mut rng = thread_rng();
let tx_hash = {
let mut buf = [0u8; 32];
rng.fill(&mut buf);
buf.pack()
};
let out_point = OutPoint::new(tx_hash.clone(), 0);
let cell = CellOutput::new_builder()
.capacity(Capacity::bytes(data.len()).expect("script capacity").pack())
.build();
self.cells.insert(out_point.clone(), (cell, data.into()));
self.cells_by_data_hash.insert(data_hash, out_point.clone());
out_point
}
#[deprecated(
since = "0.1.1",
note = "Please use the get_cell_by_data_hash function instead"
)]
pub fn get_contract_out_point(&self, data_hash: &Byte32) -> Option<OutPoint> {
self.get_cell_by_data_hash(data_hash)
}
pub fn get_cell_by_data_hash(&self, data_hash: &Byte32) -> Option<OutPoint> {
self.cells_by_data_hash.get(data_hash).cloned()
}
pub fn create_cell(&mut self, cell: CellOutput, data: Bytes) -> OutPoint {
let out_point = random_out_point();
self.create_cell_with_out_point(out_point.clone(), cell, data);
out_point
}
pub fn create_cell_with_out_point(
&mut self,
out_point: OutPoint,
cell: CellOutput,
data: Bytes,
) {
self.cells.insert(out_point, (cell, data));
}
#[deprecated(
since = "0.1.1",
note = "Please use the create_cell_with_out_point function instead"
)]
pub fn insert_cell(&mut self, out_point: OutPoint, cell: CellOutput, data: Bytes) {
self.create_cell_with_out_point(out_point, cell, data)
}
pub fn get_cell(&self, out_point: &OutPoint) -> Option<(CellOutput, Bytes)> {
self.cells.get(out_point).cloned()
}
pub fn build_script(&mut self, out_point: &OutPoint, args: Bytes) -> Option<Script> {
let (_, contract_data) = self.cells.get(out_point)?;
let data_hash = CellOutput::calc_data_hash(contract_data);
Some(
Script::new_builder()
.code_hash(data_hash)
.hash_type(ScriptHashType::Data.into())
.args(args.pack())
.build(),
)
}
fn find_cell_dep_for_script(&self, script: &Script) -> CellDep {
if script.hash_type() != ScriptHashType::Data.into() {
panic!("do not support hash_type {} yet", script.hash_type());
}
let out_point = self
.get_cell_by_data_hash(&script.code_hash())
.expect("find contract out point");
CellDep::new_builder()
.out_point(out_point)
.dep_type(DepType::Code.into())
.build()
}
pub fn complete_tx(&mut self, tx: TransactionView) -> TransactionView {
let mut cell_deps: LinkedHashSet<CellDep> = LinkedHashSet::new();
for cell_dep in tx.cell_deps_iter() {
cell_deps.insert(cell_dep);
}
for i in tx.input_pts_iter() {
if let Some((cell, _data)) = self.cells.get(&i) {
let dep = self.find_cell_dep_for_script(&cell.lock());
cell_deps.insert(dep);
if let Some(script) = cell.type_().to_opt() {
let dep = self.find_cell_dep_for_script(&script);
cell_deps.insert(dep);
}
}
}
for (cell, _data) in tx.outputs_with_data_iter() {
if let Some(script) = cell.type_().to_opt() {
let dep = self.find_cell_dep_for_script(&script);
cell_deps.insert(dep);
}
}
tx.as_advanced_builder()
.set_cell_deps(Vec::new())
.cell_deps(cell_deps.into_iter().collect::<Vec<_>>().pack())
.build()
}
fn build_resolved_tx(&self, tx: &TransactionView) -> ResolvedTransaction {
let input_cells = tx
.inputs()
.into_iter()
.map(|input| {
let previous_out_point = input.previous_output();
let (input_output, input_data) = self.cells.get(&previous_out_point).unwrap();
CellMetaBuilder::from_cell_output(
input_output.to_owned(),
input_data.to_vec().into(),
)
.out_point(previous_out_point)
.build()
})
.collect();
let resolved_cell_deps = tx
.cell_deps()
.into_iter()
.map(|deps_out_point| {
let (dep_output, dep_data) = self.cells.get(&deps_out_point.out_point()).unwrap();
CellMetaBuilder::from_cell_output(dep_output.to_owned(), dep_data.to_vec().into())
.out_point(deps_out_point.out_point())
.build()
})
.collect();
ResolvedTransaction {
transaction: tx.clone(),
resolved_cell_deps,
resolved_inputs: input_cells,
resolved_dep_groups: vec![],
}
}
fn verify_tx_consensus(&self, tx: &TransactionView) -> Result<(), CKBError> {
OutputsDataVerifier::new(tx).verify()?;
Ok(())
}
pub fn verify_tx(&self, tx: &TransactionView, max_cycles: u64) -> Result<Cycle, CKBError> {
self.verify_tx_consensus(tx)?;
let resolved_tx = self.build_resolved_tx(tx);
let mut verifier = TransactionScriptsVerifier::new(&resolved_tx, self);
verifier.set_debug_printer(|_id, msg| {
println!("[contract debug] {}", msg);
});
verifier.verify(max_cycles)
}
}
impl CellDataProvider for Context {
fn load_cell_data(&self, cell: &CellMeta) -> Option<(Bytes, Byte32)> {
cell.mem_cell_data
.as_ref()
.map(|(data, hash)| (Bytes::from(data.to_vec()), hash.to_owned()))
.or_else(|| self.get_cell_data(&cell.out_point))
}
fn get_cell_data(&self, out_point: &OutPoint) -> Option<(Bytes, Byte32)> {
self.cells.get(out_point).map(|(_, data)| {
(
Bytes::from(data.to_vec()),
CellOutput::calc_data_hash(&data),
)
})
}
}
impl HeaderProvider for Context {
fn get_header(&self, block_hash: &Byte32) -> Option<HeaderView> {
self.headers.get(block_hash).cloned()
}
}