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Install trigger for DAO-rescue soft-fork.

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Soft-fork should only be primed to trigger if the gas-limit of
block #1760000 is at most 4,000,000.

To accomplish this we pass in the gas limit of that block to
EnvInfo so it can inform Schedule. This gets marshalled through
`OpenBlock`/`ClosedBlock` and the `enact` functions much like
`last_hashes`. `block.rs`'s `env_info()` takes care to ensure
that if the current block happens to be #1760000, then we
populate with the current `gas_limit`.
This commit is contained in:
Gav Wood
2016-06-18 20:26:44 +02:00
parent 2b65011706
commit 2582253f95
9 changed files with 89 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
ethcore/src/client/client.rs
View File

@@ -220,7 +220,7 @@ impl<V> Client<V> where V: Verifier {
let last_hashes = self.build_last_hashes(header.parent_hash.clone());
let db = self.state_db.lock().unwrap().boxed_clone();
let enact_result = enact_verified(&block, engine, self.tracedb.tracing_enabled(), db, &parent, last_hashes, &self.vm_factory);
let enact_result = enact_verified(&block, engine, self.tracedb.tracing_enabled(), db, &parent, last_hashes, self.dao_rescue_block_gas_limit(), &self.vm_factory);
if let Err(e) = enact_result {
warn!(target: "client", "Block import failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
return Err(());
@@ -462,6 +462,7 @@ impl<V> BlockChainClient for Client<V> where V: Verifier {
last_hashes: last_hashes,
gas_used: U256::zero(),
gas_limit: U256::max_value(),
dao_rescue_block_gas_limit: self.dao_rescue_block_gas_limit(),
};
// that's just a copy of the state.
let mut state = self.state();
@@ -767,6 +768,7 @@ impl<V> MiningBlockChainClient for Client<V> where V: Verifier {
self.state_db.lock().unwrap().boxed_clone(),
&self.chain.block_header(&h).expect("h is best block hash: so it's header must exist: qed"),
self.build_last_hashes(h.clone()),
self.dao_rescue_block_gas_limit(),
author,
gas_floor_target,
extra_data,

9
ethcore/src/client/mod.rs
View File

@@ -42,7 +42,7 @@ use header::{BlockNumber, Header};
use transaction::{LocalizedTransaction, SignedTransaction};
use log_entry::LocalizedLogEntry;
use filter::Filter;
use views::BlockView;
use views::{HeaderView, BlockView};
use error::{ImportResult, ExecutionError};
use receipt::LocalizedReceipt;
use trace::LocalizedTrace;
@@ -221,6 +221,13 @@ pub trait BlockChainClient : Sync + Send {
Err(())
}
}
/// Get `Some` gas limit of block 1_760_000, or `None` if chain is not yet that long.
fn dao_rescue_block_gas_limit(&self) -> Option<U256> {
self.block_header(BlockID::Number(1_760_000))
.map(|header| HeaderView::new(&header).gas_limit())
}
}
/// Extended client interface used for mining