Revert "store undo coins in coinviews."

This reverts commit f2465c2caf.

lib/bcoin/chaindb.js

@@ -874,8 +874,7 @@ ChainDB.prototype.removeBlock = function removeBlock(hash, batch, callback) {
 
 ChainDB.prototype.connectBlock = function connectBlock(block, view, batch, callback) {
   var self = this;
-  var undo = new bcoin.coinview();
+  var undo = new BufferWriter();
-  var hasUndo = false;
   var i, j, tx, input, output, key, addresses, address, hash, coins, raw;
 
   if (this.options.spv) {
@@ -917,8 +916,7 @@ ChainDB.prototype.connectBlock = function connectBlock(block, view, batch, callb
           batch.del(layout.C(address, input.prevout.hash, input.prevout.index));
       }
 
-      hasUndo = true;
+      Framer.coin(input.coin, false, undo);
-      undo.addCoin(input.coin);
     }
 
     for (j = 0; j < tx.outputs.length; j++) {
@@ -949,8 +947,8 @@ ChainDB.prototype.connectBlock = function connectBlock(block, view, batch, callb
     }
   }
 
-  if (hasUndo)
+  if (undo.written > 0)
-    batch.put(layout.u(block.hash()), undo.toRaw());
+    batch.put(layout.u(block.hash()), undo.render());
 
   this.emit('add block', block);
 
@@ -1397,7 +1395,16 @@ ChainDB.prototype.getCoinView = function getCoinView(block, callback) {
 
 ChainDB.prototype.getUndoCoins = function getUndoCoins(hash, callback) {
   return this.db.fetch(layout.u(hash), function(data) {
-    return bcoin.coinview.fromRaw(data);
+    var p = new BufferReader(data);
+    var coins = [];
+    var coin;
+
+    while (p.left()) {
+      coin = Parser.parseCoin(p, false);
+      coins.push(new bcoin.coin(coin));
+    }
+
+    return coins;
   }, callback);
 };
 
@@ -1409,7 +1416,7 @@ ChainDB.prototype.getUndoCoins = function getUndoCoins(hash, callback) {
 
 ChainDB.prototype.getUndoView = function getUndoView(block, callback) {
   var self = this;
-  var i, j, tx, input;
+  var i, j, k, tx, input, coin;
 
   return this.getCoinView(block, function(err, view) {
     if (err)
@@ -1422,7 +1429,7 @@ ChainDB.prototype.getUndoView = function getUndoView(block, callback) {
       if (!coins)
         return callback(null, view);
 
-      for (i = 0; i < block.txs.length; i++) {
+      for (i = 0, k = 0; i < block.txs.length; i++) {
         tx = block.txs[i];
 
         if (tx.isCoinbase())
@@ -1430,8 +1437,11 @@ ChainDB.prototype.getUndoView = function getUndoView(block, callback) {
 
         for (j = 0; j < tx.inputs.length; j++) {
           input = tx.inputs[j];
-          input.coin = coins.spend(input.prevout.hash, input.prevout.index);
+          coin = coins[k++];
-          view.addCoin(input.coin);
+          coin.hash = input.prevout.hash;
+          coin.index = input.prevout.index;
+          input.coin = coin;
+          view.addCoin(coin);
         }
       }
 

lib/bcoin/coinview.js

@@ -8,8 +8,6 @@
 var bcoin = require('./env');
 var utils = bcoin.utils;
 var assert = utils.assert;
-var BufferReader = require('./reader');
-var BufferWriter = require('./writer');
 
 /**
  * A collections of {@link Coins} objects.
@@ -98,36 +96,6 @@ CoinView.prototype.spend = function spend(hash, index) {
   return this.coins[hash].spend(index);
 };
 
-CoinView.prototype.toRaw = function toRaw() {
-  var keys = Object.keys(this.coins);
-  var p = new BufferWriter();
-  var out = [];
-  var i, hash;
-
-  for (i = 0; i < keys.length; i++) {
-    hash = keys[i];
-    p.writeHash(hash);
-    p.writeVarBytes(this.coins[hash].toRaw());
-  }
-
-  return p.render();
-};
-
-CoinView.fromRaw = function fromRaw(data) {
-  var p = new BufferReader(data, true);
-  var map = {};
-  var hash, coins;
-
-  while (p.left()) {
-    hash = p.readHash('hex');
-    coins = bcoin.coins.fromRaw(p.readVarBytes());
-    coins.hash = hash;
-    map[hash] = coins;
-  }
-
-  return new CoinView(map);
-};
-
 /**
  * Fill transaction(s) with coins.
  * @param {TX} tx