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[ethash] chainspec validate ecip1017EraRounds non-zero (#11123)

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* [ethash]: validate `ecip1017EraRounds` non-zero

When `ecip1017EraRounds` ethash will divide by zero.

This commit ensures that the chainspec deserialization fails and
gives a better error message.

* [ecip1017_eras_block_reward]: document behaviour

* nit

* docs(ethash ecip1071): resolve `TODO`
This commit is contained in:
Niklas Adolfsson 2019-10-17 14:02:41 +02:00 committed by GitHub
parent f99819d326
commit 9c8b7c23d1
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2 changed files with 11 additions and 2 deletions
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9
ethcore/engines/ethash/src/lib.rs
View File

@ -464,7 +464,16 @@ impl Ethash {
}
}
/// Calculates the number of eras and reward
///
/// # Panics
///
/// This function will panic if `era_rounds` is less than `2`
fn ecip1017_eras_block_reward(era_rounds: u64, mut reward: U256, block_number: u64) -> (u64, U256) {
// NOTE(niklasad1): all numbers is divisible by 1, it will cause the if below
// to succeed except for the first block. Thus, `era_rounds - 1 == 0` and cause `divide by zero`
assert!(era_rounds > 1, "ecip1017EraRounds must be bigger than 1");
let eras = if block_number != 0 && block_number % era_rounds == 0 {
block_number / era_rounds - 1
} else {

2
json/src/spec/ethash.rs
View File

@ -91,6 +91,7 @@ pub struct EthashParams {
pub ecip1010_continue_transition: Option<Uint>,
/// See main EthashParams docs.
#[serde(default, deserialize_with="uint::validate_optional_non_zero")]
pub ecip1017_era_rounds: Option<Uint>,
/// Delays of difficulty bombs.
@ -101,7 +102,6 @@ pub struct EthashParams {
/// EXPIP-2 duration limit
pub expip2_duration_limit: Option<Uint>,
/// Block to transition to progpow
#[serde(rename="progpowTransition")]
pub progpow_transition: Option<Uint>,
}