rename daemon files

generic-d.go

@@ -0,0 +1,65 @@
+package main
+
+import "time"
+
+// https://bbengfort.github.io/snippets/2016/06/26/background-work-goroutines-timer.html THANKS
+
+type GenericDaemon struct {
+	Stopped         bool
+	ShutdownChannel chan string
+	Interval        time.Duration
+	period          time.Duration
+	jobs            []func(app *appContext)
+	app             *appContext
+	name            string
+}
+
+func (d *GenericDaemon) appendJobs(jobs ...func(app *appContext)) {
+	d.jobs = append(d.jobs, jobs...)
+}
+
+// NewGenericDaemon returns a daemon which can be given jobs that utilize appContext.
+func NewGenericDaemon(interval time.Duration, app *appContext, jobs ...func(app *appContext)) *GenericDaemon {
+	d := GenericDaemon{
+		Stopped:         false,
+		ShutdownChannel: make(chan string),
+		Interval:        interval,
+		period:          interval,
+		app:             app,
+		name:            "Generic Daemon",
+	}
+	d.jobs = jobs
+	return &d
+
+}
+
+func (d *GenericDaemon) Name(name string) { d.name = name }
+
+func (d *GenericDaemon) run() {
+	d.app.info.Printf("%s started", d.name)
+	for {
+		select {
+		case <-d.ShutdownChannel:
+			d.ShutdownChannel <- "Down"
+			return
+		case <-time.After(d.period):
+			break
+		}
+		started := time.Now()
+
+		for _, job := range d.jobs {
+			job(d.app)
+		}
+
+		finished := time.Now()
+		duration := finished.Sub(started)
+		d.period = d.Interval - duration
+	}
+}
+
+func (d *GenericDaemon) Shutdown() {
+	d.Stopped = true
+	d.ShutdownChannel <- "Down"
+	<-d.ShutdownChannel
+	close(d.ShutdownChannel)
+}