Created
June 16, 2020 06:10
-
-
Save bjwschaap/77b087ef7b083ed4d13f8aa972e3db59 to your computer and use it in GitHub Desktop.
Updater/worker pool idea
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| package main | |
| import ( | |
| "context" | |
| "fmt" | |
| "math/rand" | |
| "sync" | |
| "time" | |
| log "github.com/sirupsen/logrus" | |
| ) | |
| type work struct { | |
| controllers []string | |
| payload []byte | |
| } | |
| type handler struct { | |
| result chan bool | |
| id string | |
| payload string | |
| } | |
| var wchan = make(chan work, 5) | |
| func main() { | |
| ctx := context.Background() | |
| ctx, cancel := context.WithCancel(ctx) | |
| go updater(ctx, 1, wchan) | |
| go updater(ctx, 2, wchan) | |
| wchan <- work{ | |
| controllers: []string{"1234", "5678", "2eewe233"}, | |
| payload: []byte("content"), | |
| } | |
| wchan <- work{ | |
| controllers: []string{"sdaddsd", "dddd8d87d"}, | |
| payload: []byte("more content..."), | |
| } | |
| wchan <- work{ | |
| controllers: []string{"cpdisa9sa-09", "a9d0a98ad"}, | |
| payload: []byte("finally"), | |
| } | |
| time.Sleep(10 * time.Second) | |
| cancel() | |
| time.Sleep(time.Second) | |
| } | |
| func updater(ctx context.Context, id int, w <-chan work) { | |
| log.WithField("id", id).Info("updater routine starting") | |
| for { | |
| select { | |
| case wt := <-w: | |
| var wg sync.WaitGroup | |
| log.WithFields(log.Fields{ | |
| "pending": len(w), | |
| "id": id, | |
| }).Infof("received job") | |
| log.WithFields(log.Fields{ | |
| "id": id, | |
| "workers": len(wt.controllers), | |
| }).Info("spawning workers") | |
| for _, u := range wt.controllers { | |
| wg.Add(1) | |
| go worker(u, string(wt.payload), &wg, 4*time.Second) | |
| } | |
| log.Info("waiting until workers are done") | |
| wg.Wait() | |
| log.Info("done.") | |
| case <-ctx.Done(): | |
| log.Info("stopping updater") | |
| return | |
| } | |
| } | |
| } | |
| func worker(id string, payload string, wg *sync.WaitGroup, timeout time.Duration) { | |
| log.WithField("controller_id", id).Infof("worker started") | |
| defer wg.Done() | |
| // defer client.Unsubscribe | |
| h := handler{ | |
| id: id, | |
| payload: payload, | |
| result: make(chan bool, 1), | |
| } | |
| // subscribe (client.Subscribe) | |
| go h.handle() | |
| // wait for confirmation | |
| for { | |
| select { | |
| case r := <-h.result: | |
| log.WithField("result", r).Infof("worker for %s done", id) | |
| return | |
| case <-time.After(timeout): | |
| log.WithField("after", timeout).Errorf("timeout waiting for %s", id) | |
| return | |
| } | |
| } | |
| } | |
| func (h *handler) handle() { | |
| rand.Seed(time.Now().UnixNano()) | |
| d, _ := time.ParseDuration(fmt.Sprintf("%ds", rand.Intn(5))) | |
| time.Sleep(d) | |
| log.WithField("payload", h.payload).Infof("sending payload to %s", h.id) | |
| h.result <- true | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment