add tip event to chain.

lib/bcoin/chain.js

@@ -31,6 +31,8 @@ function Chain(options) {
   this.strict = this.options.strict || false;
   this.cacheLimit = this.options.cacheLimit || 2000;
 
+  this.tip = null;
+
   this.block = {
     list: [],
     // Bloom filter for all known blocks
@@ -48,7 +50,6 @@ function Chain(options) {
     hashes: [],
     ts: [],
     heights: [],
-    lookup: {},
     lastTs: 0
   };
 
@@ -204,8 +205,9 @@ Chain.prototype._addIndex = function _addIndex(hash, ts, height) {
   this.index.hashes.splice(pos, 0, hash);
   this.index.heights.splice(pos, 0, height);
   this.index.bloom.add(hash, 'hex');
-  // this.index.lookup[hash] = pos;
-  // this.index.lookup[height] = pos;
+
+  this.tip = this.getTip();
+  this.emit('tip', this.tip);
 
   this._save(hash, {
     ts: ts,
@@ -249,6 +251,9 @@ Chain.prototype.resetHeight = function resetHeight(height) {
     this.index.ts[this.index.ts.length - 1]
   );
 
+  this.tip = this.getTip();
+  this.emit('tip', this.tip);
+
   ahead.forEach(function(hash) {
     self._delete(hash);
   });
@@ -296,6 +301,9 @@ Chain.prototype._killFork = function _killFork(probe) {
   this.index.ts.splice(index, 1);
   this.index.heights.splice(index, 1);
 
+  this.tip = this.getTip();
+  this.emit('tip', this.tip);
+
   // Delete both blocks, let's see what others will choose
   this._delete(hash);
 

lib/bcoin/fullchain.js

@@ -28,7 +28,6 @@ function Chain(options) {
   this.prefix = 'bt/chain/';
   this.storage = this.options.storage;
   this.strict = this.options.strict || false;
-  this.cacheLimit = this.options.cacheLimit || 2000;
 
   this.tip = null;
 
@@ -165,6 +164,7 @@ Chain.prototype._addIndex = function _addIndex(entry) {
   this.index.heights[entry.hash] = entry.height;
 
   this.tip = this.index.entries[this.index.entries.length - 1];
+  this.emit('tip', this.tip);
 
   this._save(entry);
 
@@ -197,6 +197,7 @@ Chain.prototype.resetHeight = function resetHeight(height) {
   this.index.hashes.length = height + 1;
 
   this.tip = this.index.entries[this.index.entries.length - 1];
+  this.emit('tip', this.tip);
 
   this.index.lastTs = Math.min(
     this.index.lastTs,

lib/bcoin/miner.js

@@ -183,11 +183,12 @@ module.exports = function mine(pool, options) {
 
   miner = exports.miner(options);
 
+  // Use mempool
   pool.on('tx', function(tx) {
     miner.addTX(tx);
   });
 
-  pool.on('block', function(block) {
+  pool.chain.on('tip', function(block) {
     miner.addBlock(block);
   });