log failed attempts to fetch network fee

lib/server.js

@@ -777,6 +777,9 @@ WalletService.prototype._sampleFeeLevels = function(network, points, cb) {
         log.error('Error estimating fee', err);
         return next(err);
       }
+      if (result.feePerKB < 0) {
+        log.warn('Could not compute fee estimation (nbBlocks=' + p + ')');
+      }
       return next(null, [p, result.feePerKB * 1e8]);
     });
   }, function(err, results) {
@@ -802,22 +805,22 @@ WalletService.prototype.getFeeLevels = function(opts, cb) {
 
   var levels = [{
     name: 'emergency',
-    nbBlocks: 2,
+    nbBlocks: 1,
     modifier: 1.5,
     defaultValue: 50000
   }, {
     name: 'priority',
-    nbBlocks: 2,
+    nbBlocks: 1,
     modifier: 1,
     defaultValue: 20000
   }, {
     name: 'normal',
-    nbBlocks: 6,
+    nbBlocks: 3,
     modifier: 1,
     defaultValue: 10000
   }, {
     name: 'economy',
-    nbBlocks: 25,
+    nbBlocks: 10,
     modifier: 1,
     defaultValue: 5000
   }, ];
@@ -830,7 +833,7 @@ WalletService.prototype.getFeeLevels = function(opts, cb) {
         feePerKB = level.defaultValue;
       } else {
         var sample = feeSamples[level.nbBlocks];
-        feePerKB = (sample <= 0) ? level.defaultValue : sample * level.modifier;
+        feePerKB = (sample < 0) ? level.defaultValue : sample * level.modifier;
       }
       return {
         level: level.name,

test/integration/server.js

@@ -201,7 +201,7 @@ helpers.stubHistory = function(txs) {
 helpers.stubFeeLevels = function(levels) {
   blockchainExplorer.estimateFee = function(nbBlocks, cb) {
     return cb(null, {
-      feePerKB: levels[nbBlocks] / 1e8 || -1
+      feePerKB: levels[nbBlocks] / 1e8
     });
   };
 };
@@ -1463,9 +1463,9 @@ describe('Wallet service', function() {
 
     it('should get current fee levels', function(done) {
       helpers.stubFeeLevels({
-        2: 40000,
+        1: 40000,
-        6: 20000,
+        3: 20000,
-        25: 18000,
+        10: 18000,
       });
       server.getFeeLevels({}, function(err, fees) {
         should.not.exist(err);
@@ -1495,9 +1495,9 @@ describe('Wallet service', function() {
     });
     it('should get default fees if network cannot estimate (returns -1)', function(done) {
       helpers.stubFeeLevels({
-        2: -1,
+        1: -1,
-        6: 18000,
+        3: 18000,
-        25: 0,
+        10: 0,
       });
       server.getFeeLevels({}, function(err, fees) {
         should.not.exist(err);
@@ -1507,7 +1507,7 @@ describe('Wallet service', function() {
         fees.emergency.should.equal(50000);
         fees.priority.should.equal(20000);
         fees.normal.should.equal(18000);
-        fees.economy.should.equal(5000);
+        fees.economy.should.equal(0);
         done();
       });
     });