Merge pull request #2018 from ethcore/builtin_trait
builtin trait refactoring
This commit is contained in:
Marek Kotewicz
GitHub
commit
a88440ebae
@ -14,190 +14,250 @@
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use crypto::sha2::Sha256;
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use crypto::ripemd160::Ripemd160;
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use crypto::sha2::Sha256 as Sha256Digest;
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use crypto::ripemd160::Ripemd160 as Ripemd160Digest;
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use crypto::digest::Digest;
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use util::*;
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use ethkey::{Signature, recover};
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use ethkey::{Signature, recover as ec_recover};
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use ethjson;
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/// Definition of a contract whose implementation is built-in.
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pub struct Builtin {
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/// The gas cost of running this built-in for the given size of input data.
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pub cost: Box<Fn(usize) -> U256>, // TODO: U256 should be bignum.
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/// Run this built-in function with the input being the first argument and the output
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/// being placed into the second.
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pub execute: Box<Fn(&[u8], &mut [u8])>,
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/// Native implementation of a built-in contract.
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pub trait Impl: Send + Sync {
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/// execute this built-in on the given input, writing to the given output.
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fn execute(&self, input: &[u8], out: &mut [u8]);
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}
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// Rust does not mark closurer that do not capture as Sync
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// We promise that all builtins are thread safe since they only operate on given input.
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unsafe impl Sync for Builtin {}
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unsafe impl Send for Builtin {}
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/// A gas pricing scheme for built-in contracts.
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pub trait Pricer: Send + Sync {
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/// The gas cost of running this built-in for the given size of input data.
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fn cost(&self, in_size: usize) -> U256;
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}
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impl fmt::Debug for Builtin {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "<Builtin>")
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/// A linear pricing model. This computes a price using a base cost and a cost per-word.
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struct Linear {
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base: usize,
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word: usize,
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}
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impl Pricer for Linear {
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fn cost(&self, in_size: usize) -> U256 {
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U256::from(self.base) + U256::from(self.word) * U256::from((in_size + 31) / 32)
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}
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}
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/// Pricing scheme and execution definition for a built-in contract.
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pub struct Builtin {
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pricer: Box<Pricer>,
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native: Box<Impl>,
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}
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impl Builtin {
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/// Create a new object from components.
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pub fn new(cost: Box<Fn(usize) -> U256>, execute: Box<Fn(&[u8], &mut [u8])>) -> Builtin {
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Builtin {cost: cost, execute: execute}
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}
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/// Create a new object from a builtin-function name with a linear cost associated with input size.
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pub fn from_named_linear(name: &str, base_cost: usize, word_cost: usize) -> Builtin {
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let cost = Box::new(move|s: usize| -> U256 {
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U256::from(base_cost) + U256::from(word_cost) * U256::from((s + 31) / 32)
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});
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Self::new(cost, new_builtin_exec(name))
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}
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/// Simple forwarder for cost.
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pub fn cost(&self, s: usize) -> U256 { (*self.cost)(s) }
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pub fn cost(&self, s: usize) -> U256 { self.pricer.cost(s) }
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/// Simple forwarder for execute.
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pub fn execute(&self, input: &[u8], output: &mut[u8]) { (*self.execute)(input, output); }
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pub fn execute(&self, input: &[u8], output: &mut[u8]) { self.native.execute(input, output) }
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}
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impl From<ethjson::spec::Builtin> for Builtin {
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fn from(b: ethjson::spec::Builtin) -> Self {
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match b.pricing {
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let pricer = match b.pricing {
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ethjson::spec::Pricing::Linear(linear) => {
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Self::from_named_linear(b.name.as_ref(), linear.base, linear.word)
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Box::new(Linear {
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base: linear.base,
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word: linear.word,
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})
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}
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};
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Builtin {
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pricer: pricer,
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native: ethereum_builtin(&b.name),
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}
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}
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}
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/// Copy a bunch of bytes to a destination; if the `src` is too small to fill `dest`,
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/// leave the rest unchanged.
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pub fn copy_to(src: &[u8], dest: &mut[u8]) {
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// NICE: optimise
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for i in 0..min(src.len(), dest.len()) {
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dest[i] = src[i];
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}
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}
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/// Create a new builtin executor according to `name`.
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/// TODO: turn in to a factory with dynamic registration.
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pub fn new_builtin_exec(name: &str) -> Box<Fn(&[u8], &mut [u8])> {
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// Ethereum builtin creator.
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fn ethereum_builtin(name: &str) -> Box<Impl> {
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match name {
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"identity" => Box::new(move|input: &[u8], output: &mut[u8]| {
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for i in 0..min(input.len(), output.len()) {
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output[i] = input[i];
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"identity" => Box::new(Identity) as Box<Impl>,
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"ecrecover" => Box::new(EcRecover) as Box<Impl>,
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"sha256" => Box::new(Sha256) as Box<Impl>,
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"ripemd160" => Box::new(Ripemd160) as Box<Impl>,
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_ => panic!("invalid builtin name: {}", name),
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}
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}),
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"ecrecover" => Box::new(move|input: &[u8], output: &mut[u8]| {
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#[repr(packed)]
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#[derive(Debug, Default)]
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struct InType {
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hash: H256,
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v: H256,
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r: H256,
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s: H256,
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}
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// Ethereum builtins:
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//
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// - The identity function
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// - ec recovery
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// - sha256
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// - ripemd160
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#[derive(Debug)]
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struct Identity;
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#[derive(Debug)]
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struct EcRecover;
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#[derive(Debug)]
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struct Sha256;
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#[derive(Debug)]
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struct Ripemd160;
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impl Impl for Identity {
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fn execute(&self, input: &[u8], output: &mut [u8]) {
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let len = min(input.len(), output.len());
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output[..len].copy_from_slice(&input[..len]);
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}
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let mut it = InType::default();
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it.copy_raw(input);
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if it.v == H256::from(&U256::from(27)) || it.v == H256::from(&U256::from(28)) {
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let s = Signature::from_rsv(&it.r, &it.s, it.v[31] - 27);
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}
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impl Impl for EcRecover {
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fn execute(&self, i: &[u8], output: &mut [u8]) {
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let len = min(i.len(), 128);
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let mut input = [0; 128];
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input[..len].copy_from_slice(&i[..len]);
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let hash = H256::from_slice(&input[0..32]);
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let v = H256::from_slice(&input[32..64]);
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let r = H256::from_slice(&input[64..96]);
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let s = H256::from_slice(&input[96..128]);
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let bit = match v[31] {
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27 | 28 if &v.as_slice()[..31] == &[0; 31] => v[31] - 27,
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_ => return,
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};
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let s = Signature::from_rsv(&r, &s, bit);
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if s.is_valid() {
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if let Ok(p) = recover(&s, &it.hash) {
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if let Ok(p) = ec_recover(&s, &hash) {
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let r = p.as_slice().sha3();
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// NICE: optimise and separate out into populate-like function
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for i in 0..min(32, output.len()) {
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output[i] = if i < 12 {0} else {r[i]};
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let out_len = min(output.len(), 32);
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for x in &mut output[0.. min(12, out_len)] {
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*x = 0;
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}
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if out_len > 12 {
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output[12..out_len].copy_from_slice(&r[12..out_len]);
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}
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}
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}
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}
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}),
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"sha256" => Box::new(move|input: &[u8], output: &mut[u8]| {
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let mut sha = Sha256::new();
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sha.input(input);
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if output.len() >= 32 {
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sha.result(output);
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} else {
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let mut ret = H256::new();
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sha.result(ret.as_slice_mut());
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copy_to(&ret, output);
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}
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}),
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"ripemd160" => Box::new(move|input: &[u8], output: &mut[u8]| {
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let mut sha = Ripemd160::new();
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sha.input(input);
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let mut ret = H256::new();
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sha.result(&mut ret.as_slice_mut()[12..32]);
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copy_to(&ret, output);
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}),
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_ => {
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panic!("invalid builtin name {}", name);
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}
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}
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}
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#[test]
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fn identity() {
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let f = new_builtin_exec("identity");
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impl Impl for Sha256 {
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fn execute(&self, input: &[u8], output: &mut [u8]) {
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let out_len = min(output.len(), 32);
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let mut sha = Sha256Digest::new();
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sha.input(input);
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if out_len == 32 {
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sha.result(&mut output[0..32]);
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} else {
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let mut out = [0; 32];
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sha.result(&mut out);
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output.copy_from_slice(&out[..out_len])
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}
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}
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}
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impl Impl for Ripemd160 {
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fn execute(&self, input: &[u8], output: &mut [u8]) {
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let out_len = min(output.len(), 32);
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let mut sha = Ripemd160Digest::new();
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sha.input(input);
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for x in &mut output[0.. min(12, out_len)] {
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*x = 0;
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}
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if out_len >= 32 {
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sha.result(&mut output[12..32]);
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} else if out_len > 12 {
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let mut out = [0; 20];
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sha.result(&mut out);
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output.copy_from_slice(&out[12..out_len])
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::{Builtin, Linear, ethereum_builtin, Pricer};
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use ethjson;
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use util::U256;
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#[test]
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fn identity() {
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let f = ethereum_builtin("identity");
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let i = [0u8, 1, 2, 3];
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let mut o2 = [255u8; 2];
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f(&i[..], &mut o2[..]);
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f.execute(&i[..], &mut o2[..]);
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assert_eq!(i[0..2], o2);
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let mut o4 = [255u8; 4];
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f(&i[..], &mut o4[..]);
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f.execute(&i[..], &mut o4[..]);
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assert_eq!(i, o4);
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let mut o8 = [255u8; 8];
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f(&i[..], &mut o8[..]);
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f.execute(&i[..], &mut o8[..]);
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assert_eq!(i, o8[..4]);
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assert_eq!([255u8; 4], o8[4..]);
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}
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}
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#[test]
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fn sha256() {
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#[test]
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fn sha256() {
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use rustc_serialize::hex::FromHex;
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let f = new_builtin_exec("sha256");
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let f = ethereum_builtin("sha256");
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let i = [0u8; 0];
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let mut o = [255u8; 32];
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f(&i[..], &mut o[..]);
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f.execute(&i[..], &mut o[..]);
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assert_eq!(&o[..], &(FromHex::from_hex("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855").unwrap())[..]);
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let mut o8 = [255u8; 8];
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f(&i[..], &mut o8[..]);
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f.execute(&i[..], &mut o8[..]);
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assert_eq!(&o8[..], &(FromHex::from_hex("e3b0c44298fc1c14").unwrap())[..]);
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let mut o34 = [255u8; 34];
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f(&i[..], &mut o34[..]);
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f.execute(&i[..], &mut o34[..]);
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assert_eq!(&o34[..], &(FromHex::from_hex("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855ffff").unwrap())[..]);
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}
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}
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#[test]
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fn ripemd160() {
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#[test]
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fn ripemd160() {
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use rustc_serialize::hex::FromHex;
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let f = new_builtin_exec("ripemd160");
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let f = ethereum_builtin("ripemd160");
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let i = [0u8; 0];
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let mut o = [255u8; 32];
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f(&i[..], &mut o[..]);
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f.execute(&i[..], &mut o[..]);
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assert_eq!(&o[..], &(FromHex::from_hex("0000000000000000000000009c1185a5c5e9fc54612808977ee8f548b2258d31").unwrap())[..]);
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let mut o8 = [255u8; 8];
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f(&i[..], &mut o8[..]);
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f.execute(&i[..], &mut o8[..]);
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assert_eq!(&o8[..], &(FromHex::from_hex("0000000000000000").unwrap())[..]);
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let mut o34 = [255u8; 34];
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f(&i[..], &mut o34[..]);
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f.execute(&i[..], &mut o34[..]);
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assert_eq!(&o34[..], &(FromHex::from_hex("0000000000000000000000009c1185a5c5e9fc54612808977ee8f548b2258d31ffff").unwrap())[..]);
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}
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}
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#[test]
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fn ecrecover() {
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#[test]
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fn ecrecover() {
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use rustc_serialize::hex::FromHex;
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/*let k = KeyPair::from_secret(b"test".sha3()).unwrap();
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let a: Address = From::from(k.public().sha3());
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@ -207,75 +267,81 @@ fn ecrecover() {
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let s = k.sign(&m).unwrap();
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println!("Signed: {}", s);*/
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let f = new_builtin_exec("ecrecover");
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let f = ethereum_builtin("ecrecover");
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let i = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").unwrap();
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let mut o = [255u8; 32];
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f(&i[..], &mut o[..]);
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f.execute(&i[..], &mut o[..]);
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assert_eq!(&o[..], &(FromHex::from_hex("000000000000000000000000c08b5542d177ac6686946920409741463a15dddb").unwrap())[..]);
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let mut o8 = [255u8; 8];
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f(&i[..], &mut o8[..]);
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f.execute(&i[..], &mut o8[..]);
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assert_eq!(&o8[..], &(FromHex::from_hex("0000000000000000").unwrap())[..]);
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let mut o34 = [255u8; 34];
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f(&i[..], &mut o34[..]);
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f.execute(&i[..], &mut o34[..]);
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assert_eq!(&o34[..], &(FromHex::from_hex("000000000000000000000000c08b5542d177ac6686946920409741463a15dddbffff").unwrap())[..]);
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let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001a650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").unwrap();
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let mut o = [255u8; 32];
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f(&i_bad[..], &mut o[..]);
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f.execute(&i_bad[..], &mut o[..]);
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assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
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let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b000000000000000000000000000000000000000000000000000000000000001b0000000000000000000000000000000000000000000000000000000000000000").unwrap();
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let mut o = [255u8; 32];
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f(&i_bad[..], &mut o[..]);
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f.execute(&i_bad[..], &mut o[..]);
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assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
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let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001b").unwrap();
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let mut o = [255u8; 32];
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f(&i_bad[..], &mut o[..]);
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f.execute(&i_bad[..], &mut o[..]);
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assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
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let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001bffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff000000000000000000000000000000000000000000000000000000000000001b").unwrap();
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let mut o = [255u8; 32];
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f(&i_bad[..], &mut o[..]);
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f.execute(&i_bad[..], &mut o[..]);
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assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
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|
||||
let i_bad = FromHex::from_hex("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b000000000000000000000000000000000000000000000000000000000000001bffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap();
|
||||
let mut o = [255u8; 32];
|
||||
f(&i_bad[..], &mut o[..]);
|
||||
f.execute(&i_bad[..], &mut o[..]);
|
||||
assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);
|
||||
|
||||
// TODO: Should this (corrupted version of the above) fail rather than returning some address?
|
||||
/* let i_bad = FromHex::from_hex("48173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").unwrap();
|
||||
/* let i_bad = FromHex::from_hex("48173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").unwrap();
|
||||
let mut o = [255u8; 32];
|
||||
f(&i_bad[..], &mut o[..]);
|
||||
f.execute(&i_bad[..], &mut o[..]);
|
||||
assert_eq!(&o[..], &(FromHex::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap())[..]);*/
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
#[should_panic]
|
||||
fn from_unknown_linear() {
|
||||
let _ = Builtin::from_named_linear("dw", 10, 20);
|
||||
}
|
||||
#[test]
|
||||
#[should_panic]
|
||||
fn from_unknown_linear() {
|
||||
let _ = ethereum_builtin("foo");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn from_named_linear() {
|
||||
let b = Builtin::from_named_linear("identity", 10, 20);
|
||||
assert_eq!((*b.cost)(0), U256::from(10));
|
||||
assert_eq!((*b.cost)(1), U256::from(30));
|
||||
assert_eq!((*b.cost)(32), U256::from(30));
|
||||
assert_eq!((*b.cost)(33), U256::from(50));
|
||||
#[test]
|
||||
fn from_named_linear() {
|
||||
let pricer = Box::new(Linear { base: 10, word: 20 });
|
||||
let b = Builtin {
|
||||
pricer: pricer as Box<Pricer>,
|
||||
native: ethereum_builtin("identity"),
|
||||
};
|
||||
|
||||
assert_eq!(b.cost(0), U256::from(10));
|
||||
assert_eq!(b.cost(1), U256::from(30));
|
||||
assert_eq!(b.cost(32), U256::from(30));
|
||||
assert_eq!(b.cost(33), U256::from(50));
|
||||
|
||||
let i = [0u8, 1, 2, 3];
|
||||
let mut o = [255u8; 4];
|
||||
(*b.execute)(&i[..], &mut o[..]);
|
||||
b.execute(&i[..], &mut o[..]);
|
||||
assert_eq!(i, o);
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn from_json() {
|
||||
#[test]
|
||||
fn from_json() {
|
||||
let b = Builtin::from(ethjson::spec::Builtin {
|
||||
name: "identity".to_owned(),
|
||||
pricing: ethjson::spec::Pricing::Linear(ethjson::spec::Linear {
|
||||
@ -284,13 +350,14 @@ fn from_json() {
|
||||
})
|
||||
});
|
||||
|
||||
assert_eq!((*b.cost)(0), U256::from(10));
|
||||
assert_eq!((*b.cost)(1), U256::from(30));
|
||||
assert_eq!((*b.cost)(32), U256::from(30));
|
||||
assert_eq!((*b.cost)(33), U256::from(50));
|
||||
assert_eq!(b.cost(0), U256::from(10));
|
||||
assert_eq!(b.cost(1), U256::from(30));
|
||||
assert_eq!(b.cost(32), U256::from(30));
|
||||
assert_eq!(b.cost(33), U256::from(50));
|
||||
|
||||
let i = [0u8, 1, 2, 3];
|
||||
let mut o = [255u8; 4];
|
||||
(*b.execute)(&i[..], &mut o[..]);
|
||||
b.execute(&i[..], &mut o[..]);
|
||||
assert_eq!(i, o);
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user