index for output spend matching (speeds ups tx api

lib/TransactionDb.js

@@ -74,6 +74,8 @@ function spec(b) {
 
     var k = OUTS_PREFIX + txid;
     var ret=[];
+    var idx={};
+    var i = 0;
 
     // outs.
     db.createReadStream({start: k, end: k + '~'})
@@ -85,27 +87,24 @@ function spec(b) {
           value_sat: parseInt(v[1]),
           index: parseInt(k[2]),
         });
+        idx[parseInt(k[2])]= i++;
       })
       .on('error', function (err) {
         return cb(err);
       })
       .on('end', function () {
         var k = SPEND_PREFIX + txid;
-        var l = ret.length;
         db.createReadStream({start: k, end: k + '~'})
           .on('data', function (data) {
             var k = data.key.split('-');
             var v = data.value.split(':');
-            var set=0;
-            for(var i=0; i<l; i++) {
-              if (ret[i].index === parseInt(k[3])) {
-                ret[i].spendTxId  = v[0];
-                ret[i].spendIndex = parseInt(v[1]);
-                set=1;
-              }
-            }
-            assert(set,'Spent could not be stored: tx ' + txid +
-                   'spend in TX:' + k[2] + ',' + k[3]);
+            var j = idx[parseInt(k[3])];
+
+            assert(typeof j !== 'undefined','Spent could not be stored: tx ' + txid +
+                   'spend in TX:' + k[2] + ',' + k[3]+ ' j:' + j);
+
+            ret[j].spendTxId  = v[0];
+            ret[j].spendIndex = parseInt(v[1]);
           })
           .on('error', function (err) {
             return cb(err);

test/integration/addr.json

@@ -43,9 +43,9 @@
     },
     { 
         "addr": "mzW2hdZN2um7WBvTDerdahKqRgj3md9C29",
-        "txApperances": 6046,
-        "balance": 1149.19744101,
-        "totalReceived": 1149.19744101,
+        "txApperances": 6047,
+        "balance": 1199.74393851,
+        "totalReceived": 1199.74393851,
         "totalSent": 0
     },
     {