Initial spike

This is mostly to solidify the overall structure with the agent,
plugins, and testing philosphy.

cmd/influxdb-agent/agent.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"flag"
+	"log"
+	"os"
+	"os/signal"
+	"strings"
+
+	"github.com/influxdb/tivan"
+	_ "github.com/influxdb/tivan/plugins/all"
+)
+
+var fDebug = flag.Bool("debug", false, "show metrics as they're generated to stdout")
+
+var fConfig = flag.String("config", "", "configuration file to load")
+
+func main() {
+	flag.Parse()
+
+	var (
+		config *tivan.Config
+		err    error
+	)
+
+	if *fConfig != "" {
+		config, err = tivan.LoadConfig(*fConfig)
+		if err != nil {
+			log.Fatal(err)
+		}
+	} else {
+		config = tivan.DefaultConfig()
+	}
+
+	ag := tivan.NewAgent(config)
+
+	if *fDebug {
+		ag.Debug = true
+	}
+
+	plugins, err := ag.LoadPlugins()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	shutdown := make(chan struct{})
+
+	signals := make(chan os.Signal)
+
+	signal.Notify(signals, os.Interrupt)
+
+	go func() {
+		<-signals
+		close(shutdown)
+	}()
+
+	log.Print("InfluxDB Agent running")
+	log.Printf("Loaded plugins: %s", strings.Join(plugins, " "))
+	if ag.Debug {
+		log.Printf("Debug: enabled")
+		log.Printf("Agent Config: %#v", ag)
+	}
+
+	if config.URL != "" {
+		log.Printf("Sending metrics to: %s", config.URL)
+		log.Printf("Tags enabled: %v", config.ListTags())
+	}
+
+	ag.Run(shutdown)
+}