From 1cf3d6ccd28837e08b14320e8893e9285610d39c Mon Sep 17 00:00:00 2001
From: Chris Kleeschulte <chrisk@bitpay.com>
Date: Tue, 27 Jun 2017 16:40:10 -0400
Subject: [PATCH] wip

---
 lib/services/block/index.js | 102 +++++-------------------------------
 1 file changed, 13 insertions(+), 89 deletions(-)

diff --git a/lib/services/block/index.js b/lib/services/block/index.js
index eb704776..c38da518 100644
--- a/lib/services/block/index.js
+++ b/lib/services/block/index.js
@@ -1,12 +1,10 @@
 'use strict';
 
 var BaseService = require('../../service');
-var bitcore = require('bitcore-lib');
 var inherits = require('util').inherits;
 var Encoding = require('./encoding');
 var index = require('../../');
 var log = index.log;
-var BufferUtil = bitcore.util.buffer;
 var LRU = require('lru-cache');
 var utils = require('../../utils');
 var _ = require('lodash');
@@ -137,84 +135,6 @@ BlockService.prototype.processBlockOperations = function(opts, callback) {
 
 };
 
-BlockService.prototype.getTipOperation = function(block, add, tipType) {
-
-  var heightBuffer = new Buffer(4);
-  var tipData;
-
-  if (add) {
-    heightBuffer.writeUInt32BE(block.__height);
-    tipData = Buffer.concat([new Buffer(block.hash, 'hex'), heightBuffer]);
-  } else {
-    heightBuffer.writeUInt32BE(block.__height - 1);
-    tipData = Buffer.concat([BufferUtil.reverse(block.header.prevHash), heightBuffer]);
-  }
-
-  var type = tipType || 'tip';
-
-  return {
-    type: 'put',
-    key: this.dbPrefix + type,
-    value: tipData
-  };
-};
-
-
-
-BlockService.prototype.getBlocks = function(startHash, endHash) {
-
-  var self = this;
-  assert(startHash && startHash.length === 64, 'startHash is required to getBlocks');
-
-  // if start and end hash are the same, the caller is getting, at most, one block
-  // otherwise, the caller gets all blocks from startHash to endHash, inclusive.
-
-  // check our memory cache first, then db, then go out to p2p network
-
-  // LRU in-memory
-  var results = self._getCachedBlocks(startHash, endHash);
-
-  // in db
-  if (!results) {
-    results = self._getBlocksInDb(startHash, endHash);
-  }
-
-  var lockedOut = self._getBlocksLockedOut();
-  if (!results && !lockedOut) {
-    self._p2p.getBlocks({ startHash: startHash });
-    return true;
-  }
-
-  if (lockedOut) {
-    log.debug('Block Service: getBlocks called, but service is still in a lock out period.');
-    return false;
-  }
-};
-
-BlockService.prototype._checkCache = function(key, cache) {
-  return cache.get(key);
-};
-
-BlockService.prototype.getBlockHeader = function(hash, callback) {
-
-  var self = this;
-  var header = self._checkCache(hash, self._blockHeaderQueue);
-
-  if (header) {
-    return callback(null, header);
-  }
-
-  self._p2p.getBlockHeaders(hash);
-  var timer = setInterval(function() {
-    var header = self._checkCache(hash, self._blockHeaderQueue);
-    if (header) {
-      clearInterval(timer);
-      callback(null, header);
-    }
-  }, 250);
-  timer.unref();
-};
-
 BlockService.prototype._startSubscriptions = function() {
 
   var self = this;
@@ -240,8 +160,6 @@ BlockService.prototype._onHeaders = function(headers) {
 };
 
 BlockService.prototype._blockAlreadyProcessed = function(block) {
-  // if the block is not in our block header queue, we probably have not seen it, or
-  // it is older than about 1000 blocks
   return this._blockHeaderQueue.get(block.hash);
 };
 
@@ -336,15 +254,17 @@ BlockService.prototype._onBlock = function(block) {
       this.emit('reorg', block);
       break;
     default:
-      this._sendAllUnsentBlocksFromMainChain(block);
+      var activeChainTip = this._selectActiveChain(block);
+      this._sendAllUnsentBlocksFromAcitveChain(activeChainTip);
       break;
   }
 
 };
 
-BlockService.prototype._sendAllUnsentBlocksFromMainChain = function(block) {
+BlockService.prototype._selectActiveChain = function(block) {
+};
 
-  var blocksToSend = [block];
+BlockService.prototype._getAllUnsentBlocksFromActiveChain = function(tip) {
 
   if (!this._chainTips.get(block.hash)) {
 
@@ -365,13 +285,17 @@ BlockService.prototype._sendAllUnsentBlocksFromMainChain = function(block) {
       }
     }
   }
+};
 
-  for(var j = 0; j < blocksToSend.length; j++) {
-    var block = blocksToSend[j];
-    self._broadcast(self._subscriptions.block, 'block/block', block);
+BlockService.prototype._sendAllUnsentBlocksFromActiveChain = function(tip) {
+
+  var blocks = this._getAllUnsentBlocksFromActiveChain(tip);
+
+  for(var j = 0; j < blocks.length; j++) {
+    this._broadcast(this._subscriptions.block, 'block/block', blocks[j]);
   }
 
-  self._setTip(blocksToSend[j-1]);
+  this._setTip(blocks[j-1]);
 
 };