RanchiMall/fcoin
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avoid duplicate hash table lookups.

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This commit is contained in:
Christopher Jeffrey 2016-07-06 16:35:23 -07:00
parent a3bb955d95
commit c27466a7c5
No known key found for this signature in database
GPG Key ID: 8962AB9DE6666BBD
2 changed files with 22 additions and 8 deletions
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23
lib/bcoin/chaindb.js
View File

@ -317,6 +317,8 @@ ChainDB.prototype.getCache = function getCache(hash) {
*/
ChainDB.prototype.getHeight = function getHeight(hash, callback) {
var entry;
if (hash == null || hash < 0) {
callback = utils.asyncify(callback);
return callback(null, -1);
@ -332,9 +334,11 @@ ChainDB.prototype.getHeight = function getHeight(hash, callback) {
return callback(null, -1);
}
if (this.cacheHash.has(hash)) {
entry = this.cacheHash.get(hash);
if (entry) {
callback = utils.asyncify(callback);
return callback(null, this.cacheHash.get(hash).height);
return callback(null, entry.height);
}
this.db.fetch(layout.h(hash), function(data) {
@ -359,6 +363,8 @@ ChainDB.prototype.getHeight = function getHeight(hash, callback) {
*/
ChainDB.prototype.getHash = function getHash(height, callback) {
var entry;
if (height == null || height < 0) {
callback = utils.asyncify(callback);
return callback(null, null);
@ -369,9 +375,11 @@ ChainDB.prototype.getHash = function getHash(height, callback) {
return callback(null, height);
}
if (this.cacheHeight.has(height)) {
entry = this.cacheHeight.get(height);
if (entry) {
callback = utils.asyncify(callback);
return callback(null, this.cacheHeight.get(height).hash);
return callback(null, entry.hash);
}
this.db.fetch(layout.H(height), function(data) {
@ -445,6 +453,7 @@ ChainDB.prototype.getBoth = function getBoth(block, callback) {
ChainDB.prototype.getEntry = function getEntry(hash, callback) {
var self = this;
var entry;
if (hash == null || hash < 0)
return utils.nextTick(callback);
@ -456,8 +465,10 @@ ChainDB.prototype.getEntry = function getEntry(hash, callback) {
if (!hash)
return callback();
if (self.cacheHash.has(hash))
return callback(null, self.cacheHash.get(hash));
entry = self.cacheHash.get(hash);
if (entry)
return callback(null, entry);
return self.db.fetch(layout.e(hash), function(data) {
return bcoin.chainentry.fromRaw(self.chain, data);

7
lib/bcoin/chainentry.js
View File

@ -179,6 +179,7 @@ ChainEntry.prototype.getRetargetAncestors = function getRetargetAncestors(callba
ChainEntry.prototype.getAncestors = function getAncestors(max, callback) {
var entry = this;
var ancestors = [];
var cached;
if (max === 0)
return callback(null, []);
@ -193,12 +194,14 @@ ChainEntry.prototype.getAncestors = function getAncestors(max, callback) {
if (ancestors.length >= max)
return callback(null, ancestors);
if (!this.chain.db.hasCache(entry.prevBlock)) {
cached = this.chain.db.getCache(entry.prevBlock);
if (!cached) {
ancestors.pop();
break;
}
entry = this.chain.db.getCache(entry.prevBlock);
entry = cached;
}
(function next(err, entry) {