implement tagging

lib/GraphiteClient.js

@@ -28,6 +28,22 @@ GraphiteClient.flatten = function(obj, flat, prefix) {
   return flat;
 };
 
+GraphiteClient.appendTags = function(flatMetrics, tags) {
+  tagSuffix = '';
+  res = {};
+
+  flatTags = GraphiteClient.flatten(tags);
+  for (var key in flatTags) {
+    tagSuffix += ';' + key + '=' + flatTags[key];
+  }
+
+  for (var key in flatMetrics) {
+    res[key + tagSuffix] = flatMetrics[key];
+  }
+
+  return res;
+}
+
 GraphiteClient.prototype.write = function(metrics, timestamp, cb) {
   if (typeof timestamp === 'function') {
     cb        = timestamp;
@@ -40,6 +56,11 @@ GraphiteClient.prototype.write = function(metrics, timestamp, cb) {
   this._carbon.write(GraphiteClient.flatten(metrics), timestamp, cb);
 };
 
+GraphiteClient.prototype.writeTagged = function(metrics, tags, timestamp, cb) {
+  taggedMetrics = appendTags(GraphiteClient.flatten(metrics), tags);
+  this.write(taggedMetrics, timestamp, cb);
+}
+
 GraphiteClient.prototype.end = function() {
   this._carbon.end();
 };