// the goroutine cycle absolutely safe, no panic no error to quit.
func ExampleWorkerContainer_safe() {
var wc core.WorkerContainer
wc.GFork("myservice", func(wc core.WorkerContainer) {
defer func() {
if r := recover(); r != nil {
// log the r and ignore.
return
}
}()
for {
select {
case <-time.After(3 * time.Second):
// select other channel, do something cycle to get error.
if err := error(nil); err != nil {
// recoverable error, log it only and continue or return.
continue
}
case <-wc.QC():
// when got a quit signal, break the loop.
// and must notify the container again for other workers
// in container to quit.
wc.Quit()
return
}
}
})
}
func (h *Heartbeat) discoveryCycle(w core.WorkerContainer) {
interval := time.Duration(0)
for {
select {
case <-w.QC():
w.Quit()
return
case <-time.After(interval):
core.Info.Println("start to discovery network every", interval)
if err := h.discovery(); err != nil {
core.Warn.Println("heartbeat discovery failed, err is", err)
} else {
if len(h.ips) <= 0 {
interval = discoveryEmptyInterval
continue
}
core.Trace.Println("local ip is", h.ips, "exported", h.exportIp)
interval = discoveryRefreshInterval
}
}
}
return
}
func (s *Server) Run() (err error) {
func() {
s.lock.Lock()
defer s.lock.Unlock()
if s.closed != StateReady {
panic("server invalid state.")
}
s.closed = StateRunning
}()
// when terminated, notify the chan.
defer func() {
select {
case s.closing <- true:
default:
}
}()
core.Info.Println("server cycle running")
// run server, apply settings.
s.applyMultipleProcesses(core.Conf.Workers)
var wc core.WorkerContainer = s
for {
var gcc <-chan time.Time = nil
if core.Conf.Go.GcInterval > 0 {
gcc = time.After(time.Second * time.Duration(core.Conf.Go.GcInterval))
}
select {
case signal := <-s.sigs:
core.Trace.Println("got signal", signal)
switch signal {
case os.Interrupt, syscall.SIGTERM:
// SIGINT, SIGTERM
wc.Quit()
}
case <-wc.QC():
wc.Quit()
// wait for all goroutines quit.
s.wg.Wait()
core.Warn.Println("server cycle ok")
return
case <-gcc:
runtime.GC()
core.Info.Println("go runtime gc every", core.Conf.Go.GcInterval, "seconds")
}
}
return
}
// the goroutine cycle notify container to quit when error.
func ExampleWorkerContainer_fatal() {
var wc core.WorkerContainer
wc.GFork("myservice", func(wc core.WorkerContainer) {
for {
select {
case <-time.After(3 * time.Second):
// select other channel, do something cycle to get error.
if err := error(nil); err != nil {
// when got none-recoverable error, notify container to quit.
wc.Quit()
return
}
case <-wc.QC():
// when got a quit signal, break the loop.
// and must notify the container again for other workers
// in container to quit.
wc.Quit()
return
}
}
})
}
func (h *Heartbeat) beatCycle(w core.WorkerContainer) {
for {
c := &core.Conf.Heartbeat
select {
case <-w.QC():
w.Quit()
return
case <-time.After(time.Millisecond * time.Duration(1000*c.Interval)):
if !c.Enabled {
continue
}
core.Info.Println("start to heartbeat every", c.Interval)
if err := h.beat(); err != nil {
core.Warn.Println("heartbeat to", c.Url, "every", c.Interval, "failed, err is", err)
} else {
core.Info.Println("heartbeat to", c.Url, "every", c.Interval)
}
}
}
}