Provide a test mode to check plugins easily

accumulator.go

@@ -1,12 +1,32 @@
 package tivan
 
-import "github.com/influxdb/influxdb/client"
+import (
+	"fmt"
+	"sort"
+	"strings"
+
+	"github.com/influxdb/influxdb/client"
+)
 
 type BatchPoints struct {
 	client.BatchPoints
+
+	Debug bool
 }
 
 func (bp *BatchPoints) Add(name string, val interface{}, tags map[string]string) {
+	if bp.Debug {
+		var tg []string
+
+		for k, v := range tags {
+			tg = append(tg, fmt.Sprintf("%s=\"%s\"", k, v))
+		}
+
+		sort.Strings(tg)
+
+		fmt.Printf("> [%s] %s=%v\n", strings.Join(tg, " "), name, val)
+	}
+
 	bp.Points = append(bp.Points, client.Point{
 		Name: name,
 		Tags: tags,

agent.go

@@ -37,9 +37,15 @@ func NewAgent(config *Config) (*Agent, error) {
 		return nil, err
 	}
 
+	return agent, nil
+}
+
+func (agent *Agent) Connect() error {
+	config := agent.Config
+
 	u, err := url.Parse(config.URL)
 	if err != nil {
-		return nil, err
+		return err
 	}
 
 	c, err := client.NewClient(client.Config{
@@ -50,12 +56,12 @@ func NewAgent(config *Config) (*Agent, error) {
 	})
 
 	if err != nil {
-		return nil, err
+		return err
 	}
 
 	agent.conn = c
 
-	return agent, nil
+	return nil
 }
 
 func (a *Agent) LoadPlugins() ([]string, error) {
@@ -74,6 +80,8 @@ func (a *Agent) LoadPlugins() ([]string, error) {
 func (a *Agent) crank() error {
 	var acc BatchPoints
 
+	acc.Debug = a.Debug
+
 	for _, plugin := range a.plugins {
 		err := plugin.Gather(&acc)
 		if err != nil {
@@ -89,6 +97,21 @@ func (a *Agent) crank() error {
 	return err
 }
 
+func (a *Agent) Test() error {
+	var acc BatchPoints
+
+	acc.Debug = true
+
+	for _, plugin := range a.plugins {
+		err := plugin.Gather(&acc)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 func (a *Agent) Run(shutdown chan struct{}) {
 	ticker := time.NewTicker(a.Interval.Duration)
 

cmd/influxdb-agent/agent.go

@@ -12,7 +12,7 @@ import (
 )
 
 var fDebug = flag.Bool("debug", false, "show metrics as they're generated to stdout")
-
+var fTest = flag.Bool("test", false, "gather metrics, print them out, and exit")
 var fConfig = flag.String("config", "", "configuration file to load")
 
 func main() {
@@ -46,6 +46,20 @@ func main() {
 		log.Fatal(err)
 	}
 
+	if *fTest {
+		err = ag.Test()
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		return
+	}
+
+	err = ag.Connect()
+	if err != nil {
+		log.Fatal(err)
+	}
+
 	shutdown := make(chan struct{})
 
 	signals := make(chan os.Signal)