Many cleanups to Transaction, see detailed.

Default-ize the sequence rather than use a number, and default to bytes
for input. I doubt anybody ever uses this anyways.

Remove weird convenience code, and remove wallet logic. Checking a TX's
affects on a wallet should be managed by the wallet object.

Remove parsing for the weirder SIGHASH types. People use this library
for creating SIGHASH_ALL transactions, and I don't see the need to
support these other types at the moment since this library's more used
for wallets than for hardcore bitcoin tx analysis/creation. They weren't
tested anyways.

Add note about potentially improving performance by providing
pubkey/address. Deriving from the private key is slower, that
information should probably be cached by the end user.

src/transaction.js

@@ -2,7 +2,6 @@ var BigInteger = require('./jsbn/jsbn');
 var Script = require('./script');
 var util = require('./util');
 var convert = require('./convert');
-var Wallet = require('./wallet');
 var ECKey = require('./eckey').ECKey;
 var ECDSA = require('./ecdsa');
 var Address = require('./address');
@@ -15,8 +14,7 @@ var Transaction = function (doc) {
     this.locktime = 0;
     this.ins = [];
     this.outs = [];
-    this.timestamp = null;
+    this.defaultSequence = [255, 255, 255, 255] // 0xFFFFFFFF
-    this.block = null;
 
     if (doc) {
         if (typeof doc == "string" || Array.isArray(doc)) {
@@ -35,27 +33,11 @@ var Transaction = function (doc) {
                 this.addOutput(new TransactionOut(doc.outs[i]));
             }
         }
-        if (doc.timestamp) this.timestamp = doc.timestamp;
-        if (doc.block) this.block = doc.block;
 
         this.hash = this.hash || this.getHash()
     }
 };
 
-/**
- * Turn transaction data into Transaction objects.
- *
- * Takes an array of plain JavaScript objects containing transaction data and
- * returns an array of Transaction objects.
- */
-Transaction.objectify = function (txs) {
-  var objs = [];
-  for (var i = 0; i < txs.length; i++) {
-    objs.push(new Transaction(txs[i]));
-  }
-  return objs;
-};
-
 /**
  * Create a new txin.
  *
@@ -85,7 +67,7 @@ Transaction.prototype.addInput = function (tx, outIndex) {
                 index: outIndex
             },
             script: new Script(),
-            sequence: 4294967295
+            sequence: this.defaultSequence
         }));
     }
 };
@@ -138,7 +120,7 @@ Transaction.prototype.serialize = function () {
         var scriptBytes = txin.script.buffer;
         buffer = buffer.concat(convert.numToVarInt(scriptBytes.length));
         buffer = buffer.concat(scriptBytes);
-        buffer = buffer.concat(convert.numToBytes(parseInt(txin.sequence),4));
+        buffer = buffer.concat(txin.sequence);
     }
     buffer = buffer.concat(convert.numToVarInt(this.outs.length));
     for (var i = 0; i < this.outs.length; i++) {
@@ -191,23 +173,6 @@ function (connectedScript, inIndex, hashType)
 
   txTmp.ins[inIndex].script = connectedScript;
 
-  // Blank out some of the outputs
-  if ((hashType & 0x1f) == SIGHASH_NONE) {
-    txTmp.outs = [];
-
-    // Let the others update at will
-    for (var i = 0; i < txTmp.ins.length; i++)
-      if (i != inIndex)
-        txTmp.ins[i].sequence = 0;
-  } else if ((hashType & 0x1f) == SIGHASH_SINGLE) {
-    // TODO: Implement
-  }
-
-  // Blank out other inputs completely, not recommended for open transactions
-  if (hashType & SIGHASH_ANYONECANPAY) {
-    txTmp.ins = [txTmp.ins[inIndex]];
-  }
-
   var buffer = txTmp.serialize();
 
   buffer = buffer.concat(convert.numToBytes(parseInt(hashType),4));
@@ -246,169 +211,6 @@ Transaction.prototype.clone = function ()
   return newTx;
 };
 
-/**
- * Analyze how this transaction affects a wallet.
- *
- * Returns an object with properties 'impact', 'type' and 'addr'.
- *
- * 'impact' is an object, see Transaction#calcImpact.
- *
- * 'type' can be one of the following:
- *
- * recv:
- *   This is an incoming transaction, the wallet received money.
- *   'addr' contains the first address in the wallet that receives money
- *   from this transaction.
- *
- * self:
- *   This is an internal transaction, money was sent within the wallet.
- *   'addr' is undefined.
- *
- * sent:
- *   This is an outgoing transaction, money was sent out from the wallet.
- *   'addr' contains the first external address, i.e. the recipient.
- *
- * other:
- *   This method was unable to detect what the transaction does. Either it
- */
-Transaction.prototype.analyze = function (wallet) {
-  if (!(wallet instanceof Wallet)) return null;
-
-  var allFromMe = true,
-  allToMe = true,
-  firstRecvHash = null,
-  firstMeRecvHash = null,
-  firstSendHash = null;
-
-  for (var i = this.outs.length-1; i >= 0; i--) {
-    var txout = this.outs[i];
-    var hash = txout.script.simpleOutPubKeyHash();
-    if (!wallet.hasHash(hash)) {
-      allToMe = false;
-    } else {
-      firstMeRecvHash = hash;
-    }
-    firstRecvHash = hash;
-  }
-  for (var i = this.ins.length-1; i >= 0; i--) {
-    var txin = this.ins[i];
-    firstSendHash = txin.script.simpleInPubKeyHash();
-    if (!wallet.hasHash(firstSendHash)) {
-      allFromMe = false;
-      break;
-    }
-  }
-
-  var impact = this.calcImpact(wallet);
-
-  var analysis = {};
-
-  analysis.impact = impact;
-
-  if (impact.sign > 0 && impact.value > 0) {
-    analysis.type = 'recv';
-    analysis.addr = new Address(firstMeRecvHash);
-  } else if (allFromMe && allToMe) {
-    analysis.type = 'self';
-  } else if (allFromMe) {
-    analysis.type = 'sent';
-    // TODO: Right now, firstRecvHash is the first output, which - if the
-    //       transaction was not generated by this library could be the
-    //       change address.
-    analysis.addr = new Address(firstRecvHash);
-  } else  {
-    analysis.type = "other";
-  }
-
-  return analysis;
-};
-
-/**
- * Get a human-readable version of the data returned by Transaction#analyze.
- *
- * This is merely a convenience function. Clients should consider implementing
- * this themselves based on their UI, I18N, etc.
- */
-Transaction.prototype.getDescription = function (wallet) {
-  var analysis = this.analyze(wallet);
-
-  if (!analysis) return "";
-
-  switch (analysis.type) {
-  case 'recv':
-    return "Received with "+analysis.addr;
-    break;
-
-  case 'sent':
-    return "Payment to "+analysis.addr;
-    break;
-
-  case 'self':
-    return "Payment to yourself";
-    break;
-
-  case 'other':
-  default:
-    return "";
-  }
-};
-
-/**
- * Get the total amount of a transaction's outputs.
- */
-Transaction.prototype.getTotalOutValue = function () {
-    return this.outs.reduce(function(t,o) { return t + o.value },0);
-};
-
- /**
-  * Old name for Transaction#getTotalOutValue.
-  *
-  * @deprecated
-  */
- Transaction.prototype.getTotalValue = Transaction.prototype.getTotalOutValue;
-
-/**
- * Calculates the impact a transaction has on this wallet.
- *
- * Based on the its public keys, the wallet will calculate the
- * credit or debit of this transaction.
- *
- * It will return an object with two properties:
- *  - sign: 1 or -1 depending on sign of the calculated impact.
- *  - value: amount of calculated impact
- *
- * @returns Object Impact on wallet
- */
-Transaction.prototype.calcImpact = function (wallet) {
-  if (!(wallet instanceof Wallet)) return 0;
-
-  // Calculate credit to us from all outputs
-  var valueOut = this.outs.filter(function(o) {
-    return wallet.hasHash(convert.bytesToHex(o.script.simpleOutPubKeyHash()));
-  })
-  .reduce(function(t,o) { return t+o.value },0);
-
-  var valueIn = this.ins.filter(function(i) {
-    return wallet.hasHash(convert.bytesToHex(i.script.simpleInPubKeyHash()))
-        && wallet.txIndex[i.outpoint.hash];
-  })
-  .reduce(function(t,i) {
-    return t + wallet.txIndex[i.outpoint.hash].outs[i.outpoint.index].value
-  },0);
-
-  if (valueOut > valueIn) {
-    return {
-      sign: 1,
-      value: valueOut - valueIn
-    };
-  } else {
-    return {
-      sign: -1,
-      value: valueIn - valueOut
-    };
-  }
-};
-
 /**
  * Converts a serialized transaction into a transaction object
  */
@@ -451,7 +253,7 @@ Transaction.deserialize = function(buffer) {
                 index: readAsInt(4)
             },
             script: new Script(readVarString()),
-            sequence: readAsInt(4)
+            sequence: readBytes(4)
         });
     }
     var outs = readVarInt();
@@ -473,6 +275,9 @@ Transaction.deserialize = function(buffer) {
 Transaction.prototype.sign = function(index, key, type) {
     type = type || SIGHASH_ALL;
     key = new ECKey(key);
+    
+    // TODO: getPub is slow, sha256ripe160 probably is too.
+    // This could be sped up a lot by providing these as inputs.
     var pub = key.getPub().export('bytes'),
         hash160 = util.sha256ripe160(pub),
         script = Script.createOutputScript(new Address(hash160)),
@@ -533,7 +338,6 @@ Transaction.prototype.validateSig = function(index, script, sig, pub) {
                                       convert.coerceToBytes(pub));
 }
 
-
 var TransactionIn = function (data) {
     if (typeof data == "string")
         this.outpoint = { hash: data.split(':')[0], index: data.split(':')[1] }
@@ -549,7 +353,7 @@ var TransactionIn = function (data) {
     else
         this.script = new Script(data.script)
 
-    this.sequence = data.sequence || 4294967295;
+    this.sequence = data.sequence || this.defaultSequence
 };
 
 TransactionIn.prototype.clone = function () {

test/transaction.js

@@ -36,7 +36,7 @@ describe('Transaction', function() {
       assert.equal(tx.ins.length, 1)
 
       var input = tx.ins[0]
-      assert.equal(input.sequence, 4294967295)
+      assert.deepEqual(input.sequence, [255, 255, 255, 255])
 
       assert.equal(input.outpoint.index, 0)
       assert.equal(input.outpoint.hash, "69d02fc05c4e0ddc87e796eee42693c244a3112fffe1f762c3fb61ffcb304634")
@@ -98,7 +98,7 @@ describe('Transaction', function() {
         assert.equal(tx.ins.length, 1)
 
         var input = tx.ins[0]
-        assert.equal(input.sequence, 4294967295)
+        assert.deepEqual(input.sequence, [255, 255, 255, 255])
 
         assert.equal(input.outpoint.index, 0)
         assert.equal(input.outpoint.hash, "0cb859105100ebc3344f749c835c7af7d7103ec0d8cbc3d8ccbd5d28c3c36b57")