update hlsmon to use new reader api

bin/hlsmon

@@ -15,17 +15,29 @@ var src = process.argv[2];
 var sep = ';';
 
 function monitor(srcUrl) {
-  var r = reader(srcUrl, {noData:true, keepConnection:true});
+  var r = reader(srcUrl, {noData:true});
 
   var time = 0;
-  r.on('segment', function(seqNo, duration, file) {
-    console.log(file.modified.toJSON() + sep + file.size + sep + duration.toFixed(3) + sep + (file.size / (duration * 1024/8)).toFixed(3));
-  //  console.error('new segment at '+time.toFixed(0)+' seconds, avg bitrate (kbps):', (file.size / (duration * 1024/8)).toFixed(1));
-    time += duration;
+  r.on('readable', function() {
+    var obj;
+    while (null !== (obj = r.read())) {
+      var meta = obj.meta;
+      var duration = obj.segment.duration;
+      console.log(meta.modified.toJSON() + sep + meta.size + sep + duration.toFixed(3) + sep + (meta.size / (duration * 1024/8)).toFixed(3));
+      time += duration;
+    }
+  });
+
+  r.once('index', function() {
+    // wait until first index is returned before attaching error listener.
+    // this will enable initials errors to throw
+    r.on('error', function(err) {
+      console.error('reader error', err.stack || err);
+    });
   });
 
   r.on('end', function() {
-    if (r.index.variant) {
+    if (r.index && r.index.variant) {
       var newUrl = url.resolve(r.baseUrl, r.index.programs['1'][0].uri);
       console.error('found variant index, using: ', newUrl)
       return monitor(newUrl);