Add StdoutSink for debugging purposes

config.json

@@ -5,7 +5,7 @@
         "host": "localhost",
         "port": "8080",
         "database": "testdb",
-        "type": "influxdb"
+        "type": "stdout"
     },
     "interval" : 3,
     "duration" : 1,

metric-collector.go

@@ -26,6 +26,7 @@ var Collectors = map[string]collectors.MetricGetter{
 
 var Sinks = map[string]sinks.SinkFuncs{
 	"influxdb": &sinks.InfluxSink{},
+	"stdout": &sinks.StdoutSink{},
 }
 
 // Structure of the configuration file

sinks/stdoutSink.go

@@ -0,0 +1,44 @@
+package sinks
+
+import (
+    "fmt"
+    "time"
+    "strings"
+    "math"
+)
+
+type StdoutSink struct {
+	Sink
+}
+
+func (s *StdoutSink) Init(host string, port string, user string, password string, database string) error {
+	s.host = host
+	s.port = port
+	s.user = user
+	s.password = password
+	s.database = database
+	return nil
+}
+
+func (s *StdoutSink) Write(measurement string, tags map[string]string, fields map[string]interface{}, t time.Time) error {
+    var tagsstr []string
+    var fieldstr []string
+    for k,v := range tags {
+        tagsstr = append(tagsstr, fmt.Sprintf("%s=%s", k, v))
+    }
+    for k,v := range fields {
+        if !math.IsNaN(v.(float64)) {
+            fieldstr = append(fieldstr, fmt.Sprintf("%s=%v", k, v.(float64)))
+        }
+    }
+    if len(tagsstr) > 0 {
+        fmt.Printf("%s,%s %s %d\n", measurement, strings.Join(tagsstr, ","), strings.Join(fieldstr, ","), t.Unix())
+    } else {
+        fmt.Printf("%s %s %d\n", measurement, strings.Join(fieldstr, ","), t.Unix())
+    }
+    return nil
+}
+
+func (s *StdoutSink) Close() {
+    return
+}