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runner.go
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runner.go
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package scheduler
import (
"context"
"fmt"
"sync"
"time"
"code.cloudfoundry.org/lager"
"github.com/pf-qiu/concourse/v6/atc/db"
"github.com/pf-qiu/concourse/v6/atc/metric"
"github.com/pf-qiu/concourse/v6/atc/util"
"github.com/pf-qiu/concourse/v6/tracing"
"go.opentelemetry.io/otel/label"
)
//go:generate counterfeiter . BuildScheduler
type BuildScheduler interface {
Schedule(
ctx context.Context,
logger lager.Logger,
job db.SchedulerJob,
) (bool, error)
}
type Runner struct {
logger lager.Logger
jobFactory db.JobFactory
scheduler BuildScheduler
guardJobScheduling chan struct{}
running *sync.Map
}
func NewRunner(logger lager.Logger, jobFactory db.JobFactory, scheduler BuildScheduler, maxJobs uint64) *Runner {
return &Runner{
logger: logger,
jobFactory: jobFactory,
scheduler: scheduler,
guardJobScheduling: make(chan struct{}, maxJobs),
running: &sync.Map{},
}
}
func (s *Runner) Run(ctx context.Context) error {
sLog := s.logger.Session("run")
sLog.Debug("start")
defer sLog.Debug("done")
spanCtx, span := tracing.StartSpan(ctx, "scheduler.Run", nil)
defer span.End()
jobs, err := s.jobFactory.JobsToSchedule()
if err != nil {
return fmt.Errorf("find jobs to schedule: %w", err)
}
for _, j := range jobs {
if _, exists := s.running.LoadOrStore(j.ID(), true); exists {
// already scheduling this job
continue
}
s.guardJobScheduling <- struct{}{}
jLog := sLog.Session("job", lager.Data{"job": j.Name()})
go func(job db.SchedulerJob) {
defer func() {
err := util.DumpPanic(recover(), "scheduling job %d", job.ID())
if err != nil {
jLog.Error("panic-in-scheduler-run", err)
}
}()
defer func() {
<-s.guardJobScheduling
s.running.Delete(job.ID())
}()
schedulingLock, acquired, err := job.AcquireSchedulingLock(sLog)
if err != nil {
jLog.Error("failed-to-acquire-lock", err)
return
}
if !acquired {
return
}
defer schedulingLock.Release()
err = s.scheduleJob(spanCtx, sLog, job)
if err != nil {
jLog.Error("failed-to-schedule-job", err)
}
}(j)
}
return nil
}
func (s *Runner) scheduleJob(ctx context.Context, logger lager.Logger, job db.SchedulerJob) error {
metric.Metrics.JobsScheduling.Inc()
defer metric.Metrics.JobsScheduling.Dec()
defer metric.Metrics.JobsScheduled.Inc()
logger = logger.Session("schedule-job", lager.Data{"job": job.Name()})
spanCtx, span := tracing.StartSpan(ctx, "schedule-job", tracing.Attrs{
"team": job.TeamName(),
"pipeline": job.PipelineName(),
"job": job.Name(),
})
defer span.End()
logger.Debug("schedule")
// Grabs out the requested time that triggered off the job schedule in
// order to set the last scheduled to the exact time of this triggering
// request
requestedTime := job.ScheduleRequestedTime()
found, err := job.Reload()
if err != nil {
return fmt.Errorf("reload job: %w", err)
}
if !found {
logger.Debug("could-not-find-job-to-reload")
return nil
}
jStart := time.Now()
needsRetry, err := s.scheduler.Schedule(
spanCtx,
logger,
job,
)
if err != nil {
return fmt.Errorf("schedule job: %w", err)
}
span.SetAttributes(label.Bool("needs-retry", needsRetry))
if !needsRetry {
err = job.UpdateLastScheduled(requestedTime)
if err != nil {
logger.Error("failed-to-update-last-scheduled", err, lager.Data{"job": job.Name()})
return fmt.Errorf("update last scheduled: %w", err)
}
}
metric.SchedulingJobDuration{
PipelineName: job.PipelineName(),
JobName: job.Name(),
JobID: job.ID(),
Duration: time.Since(jStart),
}.Emit(logger)
return nil
}