handle double spends

lib/TransactionDb.js

@@ -70,8 +70,29 @@ function spec(b) {
     });
   };
 
-  TransactionDb.prototype.fromTxId = function(txid,  cb) {
+  TransactionDb.prototype._addSpendInfo = function(r, txid, index) {
+    if (r.spendTxId) {
+      if (!r.multipleSpendAttempts) {
+        r.multipleSpendAttempts = [{
+          txid: r.spendTxId,
+          index: r.index,
+        }];
+      }
+      r.multipleSpendAttempts.push({
+        txid: txid,
+        index: parseInt(index),
+      });
+    }
+    else {
+      r.spendTxId  = txid;
+      r.spendIndex = parseInt(index);
+    }
+  };
 
+
+  // This is not used now
+  TransactionDb.prototype.fromTxId = function(txid,  cb) {
+    var self = this;
     var k = OUTS_PREFIX + txid;
     var ret=[];
     var idx={};
@@ -93,6 +114,7 @@ function spec(b) {
         return cb(err);
       })
       .on('end', function () {
+
         var k = SPEND_PREFIX + txid;
         db.createReadStream({start: k, end: k + '~'})
           .on('data', function (data) {
@@ -102,15 +124,7 @@ function spec(b) {
             assert(typeof j !== 'undefined','Spent could not be stored: tx ' + txid +
                    'spend in TX:' + k[2] + ',' + k[3]+ ' j:' + j);
 
-/// TODO Handle multiple addresses here!
-            if (ret[j].spendTxId) {
-              // double spend!
-              assert(0);
-            }
-            else  {
-              ret[j].spendTxId  = k[4];
-              ret[j].spendIndex = parseInt(k[5]);
-            }
+            self._addSpendInfo(ret[j],  k[4],  k[5]);
           })
           .on('error', function (err) {
             return cb(err);
@@ -135,7 +149,7 @@ function spec(b) {
         if (err || !addr || !valueSat ) {
           console.log('Could not get TXouts in %s,%d from %s ', i.txid, i.vout, info.txid);
           incompleteInputs = 1;
-          return c_in(); // error not scaled
+          return c_in(); // error not scalated
         }
         i.addr     = addr;
         i.valueSat = valueSat;
@@ -202,12 +216,37 @@ function spec(b) {
       o.isConfirmed = is;
       if (!o.spendTxId) return cb();
 
-      self.isConfirmed(o.spendTxId, function(err,is) {
-        if (err) return cb(err);
+      if (o.multipleSpendAttempts) {
 
-        o.spendIsConfirmed = is;
-        return cb();
-      });
+        var isConfirmed = 0;
+        var txid, index;
+        async.each(o.multipleSpendAttempts, 
+          function (oi) {
+            self.isConfirmed(oi.spendTxId, function(err,is) {
+              if (err) return cb(err);
+              isConfirmed = 1;
+              txid = oi.spendTxId;
+              index = oi.index;
+              return cb();
+            });
+          },
+          function (err) {
+            // write the spended TXid into main register
+            if (isConfirmed) {
+              o.spendTxId = txid;
+              o.index = index;
+              o.spendIsConfirmed = 1;
+            }
+            return cb(err);
+          });
+      }
+      else {
+        self.isConfirmed(o.spendTxId, function(err,is) {
+          if (err) return cb(err);
+          o.spendIsConfirmed = is;
+          return cb();
+        });
+      }
     });
   };
 
@@ -238,16 +277,7 @@ function spec(b) {
           db.createReadStream({start: k, end: k + '~'})
             .on('data', function (data) {
               var k = data.key.split('-');
-              var v = data.value;
-              if (o.spendTxId) {
-                // double spend!
-                assert(0);
-              }
-              else  {
-                o.spendTxId  = k[4];
-                o.spendIndex = parseInt(k[5]);
-                o.spendTs   = parseInt(v);
-              }
+              self._addSpendInfo(o,  k[4],  k[5]);
             })
             .on('error', function (err) {
               return e_c(err);