package poller import ( "context" "errors" "sync" "time" "gitea.com/gitea/act_runner/client" runnerv1 "gitea.com/gitea/proto-go/runner/v1" "github.com/bufbuild/connect-go" log "github.com/sirupsen/logrus" ) var ErrDataLock = errors.New("Data Lock Error") func New(cli client.Client, dispatch func(context.Context, *runnerv1.Task) error, workerNum int) *Poller { return &Poller{ Client: cli, Dispatch: dispatch, routineGroup: newRoutineGroup(), metric: &metric{}, workerNum: workerNum, ready: make(chan struct{}, 1), } } type Poller struct { Client client.Client Filter *client.Filter Dispatch func(context.Context, *runnerv1.Task) error sync.Mutex routineGroup *routineGroup metric *metric ready chan struct{} workerNum int } func (p *Poller) schedule() { p.Lock() defer p.Unlock() if int(p.metric.BusyWorkers()) >= p.workerNum { return } select { case p.ready <- struct{}{}: default: } } func (p *Poller) Wait() { p.routineGroup.Wait() } func (p *Poller) Poll(ctx context.Context) error { l := log.WithField("func", "Poll") for { // check worker number p.schedule() select { // wait worker ready case <-p.ready: case <-ctx.Done(): return nil } LOOP: for { select { case <-ctx.Done(): break LOOP default: task, err := p.pollTask(ctx) if task == nil || err != nil { if err != nil { l.Errorf("can't find the task: %v", err.Error()) } time.Sleep(5 * time.Second) break } p.routineGroup.Run(func() { if err := p.dispatchTask(ctx, task); err != nil { l.Errorf("execute task: %v", err.Error()) } }) break LOOP } } } } func (p *Poller) pollTask(ctx context.Context) (*runnerv1.Task, error) { l := log.WithField("func", "pollTask") l.Info("poller: request stage from remote server") reqCtx, cancel := context.WithTimeout(ctx, 5*time.Second) defer cancel() // request a new build stage for execution from the central // build server. resp, err := p.Client.FetchTask(reqCtx, connect.NewRequest(&runnerv1.FetchTaskRequest{})) if err == context.Canceled || err == context.DeadlineExceeded { l.WithError(err).Trace("poller: no stage returned") return nil, nil } if err != nil && err == ErrDataLock { l.WithError(err).Info("task accepted by another runner") return nil, nil } if err != nil { l.WithError(err).Error("cannot accept task") return nil, err } // exit if a nil or empty stage is returned from the system // and allow the runner to retry. if resp.Msg.Task == nil || resp.Msg.Task.Id == 0 { return nil, nil } return resp.Msg.Task, nil } func (p *Poller) dispatchTask(ctx context.Context, task *runnerv1.Task) error { l := log.WithField("func", "dispatchTask") defer func() { p.metric.DecBusyWorker() e := recover() if e != nil { l.Errorf("panic error: %v", e) } p.schedule() }() runCtx, cancel := context.WithTimeout(ctx, time.Hour) defer cancel() return p.Dispatch(runCtx, task) }