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chain locator.

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This commit is contained in:
Christopher Jeffrey 2016-07-01 14:01:37 -07:00
parent e0373dbf65
commit 2b05bd0581
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GPG Key ID: 8962AB9DE6666BBD
1 changed files with 18 additions and 16 deletions
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34
lib/bcoin/chain.js
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@ -1883,7 +1883,7 @@ Chain.prototype.getLocator = function getLocator(start, callback, force) {
if (start == null)
start = this.tip.hash;
return this.db.get(start, function(err, entry) {
this.db.get(start, function(err, entry) {
if (err)
return callback(err);
@ -1898,45 +1898,47 @@ Chain.prototype.getLocator = function getLocator(start, callback, force) {
entry = self.tip;
}
height = entry.height;
entry.isMainChain(function(err, main) {
if (err)
return callback(err);
(function next(err, entry) {
(function next(err, hash) {
if (err)
return callback(err);
if (!entry)
if (!hash)
return callback(null, hashes);
hashes.push(entry.hash);
hashes.push(hash);
if (entry.height === 0)
if (height === 0)
return callback(null, hashes);
height = Math.max(entry.height - step, 0);
height = Math.max(height - step, 0);
if (hashes.length > 10)
step *= 2;
if (height === 0)
return next(null, { hash: self.network.genesis.hash, height: 0 });
return next(null, self.network.genesis.hash);
if (!main)
return entry.getAncestorByHeight(height, next);
// If we're on the main chain, we can
// do a fast lookup of the hash.
if (main)
return self.db.getHash(height, next);
// If we're in the main chain, we can
// do an O(1) lookup of the hash.
self.db.getHash(height, function(err, hash) {
entry.getAncestorByHeight(height, function(err, entry) {
if (err)
return next(err);
return callback(err);
if (!hash)
if (!entry)
return next();
next(null, { hash: hash, height: height });
return next(null, entry.hash);
});
})(null, entry);
})(null, entry.hash);
});
});
};