50 lines
1.1 KiB
Go
50 lines
1.1 KiB
Go
package daemons
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import (
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"log"
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"math/rand"
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"time"
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"github.com/localhots/satan"
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)
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// NumberPrinter is a daemon that prints numbers once in a while.
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type NumberPrinter struct {
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satan.BaseDaemon
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}
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// Startup sets up panic handler and starts enqueuing number printing jobs.
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func (n *NumberPrinter) Startup() {
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n.HandlePanics(func(err interface{}) {
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log.Printf("Oh, crap! There was a panic, take a look: %v", err)
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})
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n.LimitRate(3, 1*time.Second)
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n.SystemProcess("Random Number Generator", n.generateNumbers)
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}
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// Shutdown is empty due to the lack of cleanup.
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func (n *NumberPrinter) Shutdown() {}
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func (n *NumberPrinter) generateNumbers() {
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for n.Continue() {
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if rand.Intn(7) == 0 {
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panic("Number generator don't work on Sundays!")
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}
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// Generate a random number between 1000 and 9999 and print it
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num := 1000 + rand.Intn(9000)
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n.Process(n.makeActor(num))
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}
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}
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func (n *NumberPrinter) makeActor(num int) satan.Actor {
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return func() {
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// Making it crash sometimes
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if rand.Intn(10) == 0 {
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panic("Nooooo! Random number generator returned a zero!")
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}
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log.Println("Number printer says:", num)
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}
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}
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