more limits.Agent elaboration (#271)

controller/limits/agent.go

@@ -5,23 +5,56 @@ import (
 	"github.com/openziti/zrok/controller/store"
 	"github.com/openziti/zrok/controller/zrokEdgeSdk"
 	"github.com/sirupsen/logrus"
+	"time"
 )
 
 type Agent struct {
+	cfg   *Config
+	ifx   *influxReader
+	zCfg  *zrokEdgeSdk.Config
+	str   *store.Store
+	close chan struct{}
+	join  chan struct{}
 }
 
 func NewAgent(cfg *Config, ifxCfg *metrics.InfluxConfig, zCfg *zrokEdgeSdk.Config, str *store.Store) (*Agent, error) {
-	return &Agent{}, nil
+	return &Agent{
+		cfg:   cfg,
+		ifx:   newInfluxReader(ifxCfg),
+		zCfg:  zCfg,
+		str:   str,
+		close: make(chan struct{}),
+		join:  make(chan struct{}),
+	}, nil
 }
 
-func (a *Agent) Start() error {
-	return nil
+func (a *Agent) Start() {
+	go a.run()
 }
 
 func (a *Agent) Stop() {
+	close(a.close)
+	<-a.join
 }
 
 func (a *Agent) Handle(u *metrics.Usage) error {
 	logrus.Infof("handling: %v", u)
 	return nil
 }
+
+func (a *Agent) run() {
+	logrus.Info("started")
+	defer logrus.Info("stopped")
+
+mainLoop:
+	for {
+		select {
+		case <-time.After(a.cfg.Cycle):
+			logrus.Info("insepection cycle")
+
+		case <-a.close:
+			close(a.join)
+			break mainLoop
+		}
+	}
+}