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migrate: fixes and optimizations for chaindb2to3.

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This commit is contained in:
Christopher Jeffrey 2017-07-18 08:57:28 -07:00
parent 70a2f64de6
commit 7f5649dbd8
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GPG Key ID: 8962AB9DE6666BBD
1 changed files with 20 additions and 4 deletions
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24
migrate/chaindb2to3.js
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@ -173,6 +173,9 @@ async function reserializeUndo(hash) {
}
}
// We need to reverse everything.
undo.items.reverse();
batch.put(pair('u', tip.hash), undo.toRaw());
if (++total % 1000 === 0) {
@ -377,11 +380,17 @@ async function finalize() {
}
async function getMeta(coin, prevout) {
let item, data, coins;
let item, data, br, version, height;
if (coin.height !== -1)
// Case 1: Undo coin is the last spend.
if (coin.height !== -1) {
assert(coin.version !== -1);
return [coin.version, coin.height, true];
}
// Case 2: We have previously cached
// this coin's metadata, but it's not
// written yet.
item = metaCache.get(prevout.hash);
if (item) {
@ -389,6 +398,9 @@ async function getMeta(coin, prevout) {
return [version, height, false];
}
// Case 3: We have previously cached
// this coin's metadata, and it is
// written.
data = await db.get(pair(0x01, prevout.hash));
if (data) {
@ -397,12 +409,16 @@ async function getMeta(coin, prevout) {
return [version, height, false];
}
// Case 4: The coin's metadata is
// still in the top-level UTXO set.
data = await db.get(pair('c', prevout.hash));
assert(data);
coins = OldCoins.fromRaw(data, prevout.hash);
br = new BufferReader(data);
version = br.readVarint();
height = br.readU32();
return [coins.version, coins.height, true];
return [version, height, true];
}
async function getTip() {