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block: enforce gas limit falls within engine bounds 

Former-commit-id: 488cde417f32cca0fd24db93174fa120f184921d
This commit is contained in:
Robert Habermeier 2016-12-11 12:50:48 +01:00
parent f8683058b3
commit 18c2a599d7
2 changed files with 5 additions and 3 deletions
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3
ethcore/src/block.rs
View File

@ -266,7 +266,8 @@ impl<'x> OpenBlock<'x> {
r.block.base.header.set_extra_data(extra_data);
r.block.base.header.note_dirty();
engine.populate_from_parent(&mut r.block.base.header, parent, gas_range_target.0, gas_range_target.1);
let gas_floor_target = ::std::cmp::max(gas_range_target.0, engine.params().min_gas_limit);
engine.populate_from_parent(&mut r.block.base.header, parent, gas_floor_target, gas_range_target.1);
engine.on_new_block(&mut r.block);
Ok(r)
}

5
ethcore/src/engines/mod.rs
View File

@ -118,8 +118,9 @@ pub trait Engine : Sync + Send {
self.verify_block_basic(header, None).and_then(|_| self.verify_block_unordered(header, None))
}
/// Don't forget to call Super::populate_from_parent when subclassing & overriding.
// TODO: consider including State in the params.
/// Populate a header's fields based on its parent's header.
/// Takes gas floor and ceiling targets.
/// The gas floor target must not be lower than the engine's minimum gas limit.
fn populate_from_parent(&self, header: &mut Header, parent: &Header, _gas_floor_target: U256, _gas_ceil_target: U256) {
header.set_difficulty(parent.difficulty().clone());
header.set_gas_limit(parent.gas_limit().clone());