Merge pull request #126 from matiu/feature/startAt

add startAt opts in sync

lib/HistoricSync.js

@@ -189,11 +189,23 @@ HistoricSync.prototype.checkNetworkSettings = function(next) {
   });
 };
 
-HistoricSync.prototype.updateStartBlock = function(next) {
+HistoricSync.prototype.updateStartBlock = function(opts, next) {
   var self = this;
 
   self.startBlock = self.genesis;
 
+  if (opts.startAt) {
+    self.sync.bDb.fromHashWithInfo(opts.startAt, function(err, bi) {
+      var blockInfo = bi ? bi.info : {};
+      if (blockInfo.height) {
+        self.startBlock = opts.startAt;
+        self.height = blockInfo.height;
+        info('Resuming sync from block: %s #%d',opts.startAt, self.height);
+        return next(err);
+      }
+    });
+  }
+  else {
     self.sync.bDb.getTip(function(err,tip, height) {
       if (!tip) return next();
 
@@ -242,6 +254,7 @@ HistoricSync.prototype.updateStartBlock = function(next) {
         }
       );
     });
+  }
 };
 
 HistoricSync.prototype.prepareFileSync = function(opts, next) {
@@ -363,7 +376,7 @@ HistoricSync.prototype.prepareToSync = function(opts, next) {
       self.updateBlockChainHeight(s_c);
     },
     function(s_c) {
-      self.updateStartBlock(s_c);
+      self.updateStartBlock(opts,s_c);
     },
     function(s_c) {
       self.prepareFileSync(opts, s_c);

lib/Sync.js

@@ -97,15 +97,16 @@ Sync.prototype.storeTipBlock = function(b, allowReorgs, cb) {
   self.storingBlock=1;
   var oldTip, oldNext, oldHeight, needReorg = false, height = -1;
   var newPrev = b.previousblockhash;
-
   async.series([
-      function(c) {
-        // TODO? remove this check?
-        self.bDb.has(b.hash, function(err, val) {
-          return c(err ||
-            (val ? new Error('WARN: Ignoring already existing block:' + b.hash) : null));
-        });
-      },
+
+      // This seems unnecesary.
+      // function(c) {
+      //   // TODO? remove this check?
+      //   self.bDb.has(b.hash, function(err, val) {
+      //     return c(err ||
+      //       (val ? new Error('WARN: Ignoring already existing block:' + b.hash) : null));
+      //   });
+      // },
       function(c) {
         if (!allowReorgs || newPrev === self.cachedLastHash) return c();
         self.bDb.has(newPrev, function(err, val) {
@@ -120,7 +121,6 @@ Sync.prototype.storeTipBlock = function(b, allowReorgs, cb) {
         self.bDb.getTip(function(err, hash, h) {
           oldTip = hash;
           oldHeight = hash ? (h || 0) : -1
-
           if (oldTip && newPrev !== oldTip) {
             needReorg = true;
             console.log('## REORG Triggered, tip mismatch');

util/sync.js

@@ -15,7 +15,8 @@ program
   .option('-D --destroy', 'Remove current DB (and start from there)', 0)
   .option('-S --startfile', 'Number of file from bitcoind to start(default=0)')
   .option('-R --rpc', 'Force sync with RPC')
-  .option('--stop [hash]', 'StopAt block',1)
+  .option('--start [hash]', 'StartAt block')
+  .option('--stop [hash]', 'StopAt block')
   .option('-v --verbose', 'Verbose 0/1', 0)
   .parse(process.argv);
 
@@ -34,6 +35,7 @@ async.series([
     var opts= {
       forceStartFile: program.startfile,
       forceRPC: program.rpc,
+      startAt: program.start,
       stopAt: program.stop,
     };
     console.log('[options]',opts); //TODO