improve spv. fix preloading.

bin/spvnode

@@ -11,7 +11,7 @@ var node = bcoin.spvnode({
 });
 
 node.on('error', function(err) {
-  bcoin.debug(err.message);
+  bcoin.debug(err.stack + '');
 });
 
 node.open(function(err) {

lib/bcoin/chain.js

@@ -336,18 +336,14 @@ Chain.prototype._preload = function _preload(callback) {
     });
 
     stream.on('error', function(err) {
-      var start = Math.max(0, height - 2);
-      self.reset(start, function(e) {
-        if (e)
-          return callback(e);
-        return callback(err);
-      });
+      stream.destroy();
+      return callback(err);
     });
 
     stream.on('data', function(data) {
       var blocks = [];
       var need = 80 - buf.size;
-      var lastEntry, block, entry, start;
+      var lastEntry, block, data, entry;
 
       while (data.length >= need) {
         buf.data.push(data.slice(0, need));
@@ -368,11 +364,12 @@ Chain.prototype._preload = function _preload(callback) {
         return;
 
       for (i = 0; i < blocks.length; i++) {
-        block = blocks[i];
+        data = blocks[i];
 
         try {
           data = parseHeader(data);
         } catch (e) {
+          stream.destroy();
           return callback(e);
         }
 
@@ -386,13 +383,8 @@ Chain.prototype._preload = function _preload(callback) {
 
         // Do some paranoid checks.
         if (lastEntry && data.prevBlock !== lastEntry.hash) {
-          start = Math.max(0, height - 2);
           stream.destroy();
-          return self.reset(start, function(err) {
-            if (err)
-              return callback(err);
-            return callback(new Error('Corrupt headers.'));
-          });
+          return callback(new Error('Corrupt headers.'));
         }
 
         // Create headers object for validation.
@@ -401,13 +393,8 @@ Chain.prototype._preload = function _preload(callback) {
         // Verify the block headers. We don't want to
         // trust an external centralized source completely.
         if (!block.verifyHeaders()) {
-          start = Math.max(0, height - 2);
           stream.destroy();
-          return self.reset(start, function(err) {
-            if (err)
-              return callback(err);
-            return callback(new Error('Bad headers.'));
-          });
+          return callback(new Error('Bad headers.'));
         }
 
         // Create a chain entry.
@@ -490,6 +477,9 @@ Chain.prototype._verify = function _verify(block, prev, callback) {
   if (!block.verify(ret))
     return done(new VerifyError(block, 'invalid', ret.reason, ret.score));
 
+  if (this.options.spv || block.type !== 'block')
+    return done();
+
   // Skip the genesis block
   if (block.isGenesis())
     return done(null, flags);

lib/bcoin/protocol/parser.js

@@ -834,7 +834,6 @@ Parser.parseBlockHeaders = function parseBlockHeaders(p) {
     ts: p.readU32(),
     bits: p.readU32(),
     nonce: p.readU32(),
-    totalTX: p.readVarint(),
     _size: p.end()
   }
 };