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better error handling, migrate version key as well

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This commit is contained in:
Robert Habermeier 2016-07-08 16:45:04 +02:00
parent aaf9490c91
commit 3b0b1375f2
1 changed files with 17 additions and 7 deletions
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24
ethcore/src/migrations/state/v7.rs
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@ -79,6 +79,13 @@ impl SimpleMigration for ArchiveV7 {
}
}
// magic numbers and constants for overlay-recent at v6.
// re-written here because it may change in the journaldb module.
const V7_LATEST_ERA_KEY: &'static [u8] = &[ b'l', b'a', b's', b't', 0, 0, 0, 0, 0, 0, 0, 0 ];
const V7_VERSION_KEY: &'static [u8] = &[ b'j', b'v', b'e', b'r', 0, 0, 0, 0, 0, 0, 0, 0 ];
const DB_VERSION: u32 = 0x203;
const PADDING : [u8; 10] = [0u8; 10];
/// Version for OverlayRecent database.
/// more involved than the archive version because of journaling.
#[derive(Default)]
@ -91,12 +98,7 @@ impl OverlayRecentV7 {
// replacing any known migrated keys with their counterparts
// and then committing again.
fn migrate_journal(&self, source: &Database, mut batch: Batch, dest: &mut Database) -> Result<(), Error> {
// re-written here because it may change in the journaldb module.
const V7_LATEST_ERA_KEY: &'static [u8] = &[ b'l', b'a', b's', b't', 0, 0, 0, 0, 0, 0, 0, 0 ];
const PADDING : [u8; 10] = [0u8; 10];
if let Some(val) = source.get(V7_LATEST_ERA_KEY).expect("Low-level database error.") {
if let Some(val) = try!(source.get(V7_LATEST_ERA_KEY).map_err(Error::Custom)) {
try!(batch.insert(V7_LATEST_ERA_KEY.into(), val.to_owned(), dest));
let mut era = decode::<u64>(&val);
@ -109,7 +111,7 @@ impl OverlayRecentV7 {
r.out()
};
if let Some(journal_raw) = source.get(&entry_key).expect("Low-level database error.") {
if let Some(journal_raw) = try!(source.get(&entry_key).map_err(Error::Custom)) {
let rlp = Rlp::new(&journal_raw);
let id: H256 = rlp.val_at(0);
let mut inserted_keys: Vec<(H256, Bytes)> = Vec::new();
@ -172,6 +174,14 @@ impl Migration for OverlayRecentV7 {
fn migrate(&mut self, source: &Database, config: &Config, dest: &mut Database) -> Result<(), Error> {
let mut batch = Batch::new(config);
// migrate version metadata.
match try!(source.get(V7_VERSION_KEY).map_err(Error::Custom)) {
Some(ref version) if decode::<u32>(&*version) == DB_VERSION => {
try!(batch.insert(V7_VERSION_KEY.into(), version[..].to_owned(), dest));
}
_ => return Err(Error::MigrationImpossible), // missing or wrong version
}
for (key, value) in source.iter().filter(|&(ref k, _)| k.len() == 32) {
let key_h = H256::from_slice(&key[..]);
if let Ok(new_key) = attempt_migrate(key_h.clone(), &value) {