remove hdkeycache

index.js

@@ -66,5 +66,4 @@ bitcore.deps.elliptic = require('elliptic');
 bitcore.deps._ = require('lodash');
 
 // Internal usage, exposed for testing/advanced tweaking
-bitcore._HDKeyCache = require('./lib/hdkeycache');
 bitcore.Transaction.sighash = require('./lib/transaction/sighash');

lib/hdkeycache.js

@@ -1,45 +0,0 @@
-'use strict';
-
-module.exports = {
-  _cache: {},
-  _count: 0,
-  _eraseIndex: 0,
-  _usedList: {},
-  _usedIndex: {},
-  _CACHE_SIZE: 5000,
-
-  get: function(xkey, number, hardened, nonCompliant) {
-    hardened = !!hardened;
-    var key = (nonCompliant ? '1' : '0') + xkey + '/' + number + '/' + hardened;
-    if (this._cache[key]) {
-      this._cacheHit(key);
-      return this._cache[key];
-    }
-  },
-  set: function(xkey, number, hardened, derived, nonCompliant) {
-    hardened = !!hardened;
-    var key =  (nonCompliant ? '1' : '0') + xkey + '/' + number + '/' + hardened;
-    this._cache[key] = derived;
-    this._cacheHit(key);
-  },
-  _cacheHit: function(key) {
-    if (this._usedIndex[key]) {
-      delete this._usedList[this._usedIndex[key]];
-    }
-    this._usedList[this._count] = key;
-    this._usedIndex[key] = this._count;
-    this._count++;
-    this._cacheRemove();
-  },
-  _cacheRemove: function() {
-    while (this._eraseIndex < this._count - this._CACHE_SIZE) {
-      if (this._usedList[this._eraseIndex]) {
-        var removeKey = this._usedList[this._eraseIndex];
-        delete this._usedIndex[removeKey];
-        delete this._cache[removeKey];
-      }
-      delete this._usedList[this._eraseIndex];
-      this._eraseIndex++;
-    }
-  }
-};

lib/hdprivatekey.js

@@ -11,7 +11,6 @@ var Base58 = require('./encoding/base58');
 var Base58Check = require('./encoding/base58check');
 var Hash = require('./crypto/hash');
 var Network = require('./networks');
-var HDKeyCache = require('./hdkeycache');
 var Point = require('./crypto/point');
 var PrivateKey = require('./privatekey');
 var Random = require('./crypto/random');
@@ -200,11 +199,6 @@ HDPrivateKey.prototype._deriveWithNumber = function(index, hardened, nonComplian
     index += HDPrivateKey.Hardened;
   }
 
-  var cached = HDKeyCache.get(this.xprivkey, index, hardened, nonCompliant);
-  if (cached) {
-    return cached;
-  }
-
   var indexBuffer = BufferUtil.integerAsBuffer(index);
   var data;
   if (hardened && nonCompliant) {
@@ -243,7 +237,7 @@ HDPrivateKey.prototype._deriveWithNumber = function(index, hardened, nonComplian
     chainCode: chainCode,
     privateKey: privateKey
   });
-  HDKeyCache.set(this.xprivkey, index, hardened, derived, nonCompliant);
+
   return derived;
 };
 

lib/hdpublickey.js

@@ -8,7 +8,6 @@ var Base58 = require('./encoding/base58');
 var Base58Check = require('./encoding/base58check');
 var Hash = require('./crypto/hash');
 var HDPrivateKey = require('./hdprivatekey');
-var HDKeyCache = require('./hdkeycache');
 var Network = require('./networks');
 var Point = require('./crypto/point');
 var PublicKey = require('./publickey');
@@ -130,10 +129,6 @@ HDPublicKey.prototype._deriveWithNumber = function(index, hardened) {
   if (index < 0) {
     throw new hdErrors.InvalidPath(index);
   }
-  var cached = HDKeyCache.get(this.xpubkey, index, false);
-  if (cached) {
-    return cached;
-  }
 
   var indexBuffer = BufferUtil.integerAsBuffer(index);
   var data = BufferUtil.concat([this.publicKey.toBuffer(), indexBuffer]);
@@ -156,7 +151,7 @@ HDPublicKey.prototype._deriveWithNumber = function(index, hardened) {
     chainCode: chainCode,
     publicKey: publicKey
   });
-  HDKeyCache.set(this.xpubkey, index, false, derived);
+
   return derived;
 };
 

test/hdkeycache.js

@@ -1,52 +0,0 @@
-'use strict';
-
-var _ = require('lodash');
-var expect = require('chai').expect;
-var bitcore = require('..');
-var HDPrivateKey = bitcore.HDPrivateKey;
-
-var xprivkey = 'xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi';
-
-describe('HDKey cache', function() {
-  this.timeout(10000);
-
-  /* jshint unused: false */
-  var cache = bitcore._HDKeyCache;
-  var master = new HDPrivateKey(xprivkey);
-
-  beforeEach(function() {
-    cache._cache = {};
-    cache._count = 0;
-    cache._eraseIndex = 0;
-    cache._usedIndex = {};
-    cache._usedList = {};
-    cache._CACHE_SIZE = 3; // Reduce for quick testing
-  });
-
-  it('saves a derived key', function() {
-    var child = master.deriveChild(0);
-    expect(cache._cache['0' + master.xprivkey + '/0/false'].xprivkey).to.equal(child.xprivkey);
-  });
-  it('starts erasing unused keys', function() {
-    var child1 = master.deriveChild(0);
-    var child2 = child1.deriveChild(0);
-    var child3 = child2.deriveChild(0);
-    expect(cache._cache['0' + master.xprivkey + '/0/false'].xprivkey).to.equal(child1.xprivkey);
-    var child4 = child3.deriveChild(0);
-    expect(cache._cache['0' + master.xprivkey + '/0/false']).to.equal(undefined);
-  });
-  it('avoids erasing keys that get cache hits ("hot keys")', function() {
-    var child1 = master.deriveChild(0);
-    var child2 = master.deriveChild(0).deriveChild(0);
-    expect(cache._cache['0' + master.xprivkey + '/0/false'].xprivkey).to.equal(child1.xprivkey);
-    var child1_copy = master.deriveChild(0);
-    expect(cache._cache['0' + master.xprivkey + '/0/false'].xprivkey).to.equal(child1.xprivkey);
-  });
-  it('keeps the size of the cache small', function() {
-    var child1 = master.deriveChild(0);
-    var child2 = child1.deriveChild(0);
-    var child3 = child2.deriveChild(0);
-    var child4 = child3.deriveChild(0);
-    expect(_.size(cache._cache)).to.equal(3);
-  });
-});

test/hdpublickey.js

@@ -271,12 +271,5 @@ describe('HDPublicKey interface', function() {
       valid = HDPublicKey.isValidPath(HDPublicKey.Hardened);
       valid.should.equal(false);
     });
-
-    it('should use the cache', function() {
-      var pubkey = new HDPublicKey(xpubkey);
-      var derived1 = pubkey.deriveChild(0);
-      var derived2 = pubkey.deriveChild(0);
-      derived1.should.equal(derived2);
-    });
   });
 });