// NewCrontab creates a cron server.
func NewCrontab(freq time.Duration) *Crontab {
c := &Crontab{
jobs: make(map[string]Job),
commandChan: make(chan *command),
ticker: time.NewTicker(freq),
}
c.loop = loop.GoRecoverable(c.backendLoop, c.checkRecovering)
return c
}
// newSystemMonitor starts the system monitor.
func newSystemMonitor() *systemMonitor {
m := &systemMonitor{
measuringChan: make(chan *Measuring, 1000),
ssvChangeChan: make(chan *ssvChange, 1000),
retrieverRegistrationChan: make(chan *retrieverRegistration, 10),
commandChan: make(chan *command),
}
m.backend = loop.GoRecoverable(m.backendLoop, m.checkRecovering)
return m
}
// Test error inside a recovered loop.
func TestRecoveringsError(t *testing.T) {
assert := asserts.NewTestingAssertion(t, true)
done := false
count := 0
l := loop.GoRecoverable(generateErrorPanicBackend(&done, &count), catchTimeout)
time.Sleep(longDelay)
assert.ErrorMatch(l.Stop(), "timed out", "error has to be 'timed out'")
assert.True(done, "backend has done")
status, _ := l.Error()
assert.Equal(loop.Stopped, status, "loop is stopped")
}
// Test regular stop of a recovered loop.
func TestStopRecoverings(t *testing.T) {
assert := asserts.NewTestingAssertion(t, true)
done := false
count := 0
l := loop.GoRecoverable(generateSimplePanicBackend(&done, &count), ignorePanics)
time.Sleep(longDelay)
assert.Nil(l.Stop(), "no error after simple stop")
assert.True(done, "backend has done")
status, _ := l.Error()
assert.Equal(loop.Stopped, status, "loop is stopped")
}
// Test recoverings after panics.
func TestRecoverings(t *testing.T) {
assert := asserts.NewTestingAssertion(t, true)
done := false
count := 0
l := loop.GoRecoverable(generateSimplePanicBackend(&done, &count), checkRecovering)
time.Sleep(veryLongDelay)
assert.ErrorMatch(l.Stop(), "too many panics", "error has to be 'too many panics'")
assert.True(done, "backend has done")
assert.Equal(count, 5, "loop has to be restarted 5 times")
status, _ := l.Error()
assert.Equal(loop.Stopped, status, "loop is stopped")
}
func ExampleRecoverFunc() {
printChan := make(chan string)
loopFunc := func(l loop.Loop) error {
for {
select {
case <-l.ShallStop():
return nil
case str := <-printChan:
println(str)
}
}
}
recoverFunc := func(rs loop.Recoverings) (loop.Recoverings, error) {
if len(rs) >= 5 {
return nil, errors.New("too many panics")
}
return rs, nil
}
loop.GoRecoverable(loopFunc, recoverFunc)
}