miner: add "preverify" option.

etc/sample.conf

@@ -91,6 +91,7 @@ known-peers: ./known-peers
 
 coinbase-flags: mined by bcoin
 # payout-address: 1111111111111111111114oLvT2,1111111111111111111114oLvT2
+preverify: false
 max-block-weight: 4000000
 reserved-block-weight: 4000
 reserved-block-sigops: 400

lib/mining/miner.js

@@ -322,6 +322,23 @@ Miner.prototype._createBlock = co(function* createBlock(tip, address) {
     Amount.btc(attempt.fees),
     attempt.items.length + 1);
 
+  if (this.options.preverify) {
+    try {
+      yield this.chain._verifyBlock(attempt.block);
+    } catch (e) {
+      if (e.type === 'VerifyError') {
+        this.logger.warning('Miner created invalid block!');
+        this.logger.error(e);
+        throw new Error('BUG: Miner created invalid block.');
+      }
+      throw e;
+    }
+
+    this.logger.debug(
+      'Preverified block %d successfully!',
+      attempt.height);
+  }
+
   return attempt;
 });
 
@@ -512,6 +529,7 @@ function MinerOptions(options) {
   this.version = -1;
   this.addresses = [];
   this.coinbaseFlags = new Buffer('mined by bcoin', 'ascii');
+  this.preverify = false;
 
   this.minWeight = policy.MIN_BLOCK_WEIGHT;
   this.maxWeight = policy.MAX_BLOCK_WEIGHT;
@@ -581,6 +599,11 @@ MinerOptions.prototype.fromOptions = function fromOptions(options) {
     this.coinbaseFlags = flags;
   }
 
+  if (options.preverify != null) {
+    assert(typeof options.preverify === 'boolean');
+    this.preverify = options.preverify;
+  }
+
   if (options.minWeight != null) {
     assert(util.isNumber(options.minWeight));
     this.minWeight = options.minWeight;

lib/node/config.js

@@ -283,6 +283,7 @@ config.toOptions = function toOptions(data) {
   // Miner
   options.payoutAddress = list(data.payoutaddress);
   options.coinbaseFlags = str(data.coinbaseflags);
+  options.preverify = bool(data.preverify);
   options.maxBlockWeight = num(data.maxblockweight);
   options.reservedBlockWeight = num(data.reservedblockweight);
   options.reservedBlockSigops = num(data.reservedblocksigops);

lib/node/fullnode.js

@@ -121,6 +121,7 @@ function FullNode(options) {
     fees: this.fees,
     address: this.options.payoutAddress,
     coinbaseFlags: this.options.coinbaseFlags,
+    preverify: this.options.preverify,
     maxWeight: this.options.maxBlockWeight,
     reservedWeight: this.options.reservedBlockWeight,
     reservedSigops: this.options.reservedBlockSigops