finish metric api

lib/api/metric.js

@@ -1,13 +1,36 @@
-var metric_api = function(){
+var v8type = require('v8type');
 
-};
 
-metric_api.prototype.add_metric = function(){
+var metric_api = function(){};
 
+metric_api.prototype.add_metric = function(metric, callback){
+    var metrics = {
+	'series': [metric]
+    };
+    this.add_metrics(metrics, callback);
 };
 
-metric_api.prototype.add_metrics = function(){
+metric_api.prototype.add_metrics = function(metrics, callback){
+    if(!v8type.is(metrics, v8type.OBJECT)){
+	throw new Error('`metrics` parameter must be an object');
+    }
+
+    if(!metrics['series'] || !v8type.is(metrics['series'], v8type.ARRAY)){
+	throw new Error('`metrics["series"]` parameter must be an array');
+    }
+
+    for(var i in metrics['series']){
+	var metric = metrics['series'][i];
+	if(!metric['metric']){
+	    throw new Error('metric["metric"] is required');
+	}
+
+	if(!metric['points'] || !v8type.is(metric['points'], v8type.ARRAY)){
+	    throw new Error('metric["points"] must be an array');
+	}
+    }
 
+    this.request('POST', '/series', {body: metrics}, callback);
 };
 
 return module.exports = metric_api;