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runner.go
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runner.go
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package scheduler
import (
"errors"
"os"
"time"
"code.cloudfoundry.org/lager"
"github.com/concourse/atc"
"github.com/concourse/atc/db"
"github.com/concourse/atc/db/algorithm"
"github.com/concourse/atc/metric"
)
//go:generate counterfeiter . BuildScheduler
type BuildScheduler interface {
Schedule(
logger lager.Logger,
versions *algorithm.VersionsDB,
jobConfigs atc.JobConfigs,
resourceConfigs atc.ResourceConfigs,
resourceTypes atc.ResourceTypes,
) (map[string]time.Duration, error)
TriggerImmediately(
logger lager.Logger,
jobConfig atc.JobConfig,
resourceConfigs atc.ResourceConfigs,
resourceTypes atc.ResourceTypes,
) (db.Build, Waiter, error)
SaveNextInputMapping(logger lager.Logger, job atc.JobConfig) error
}
var errPipelineRemoved = errors.New("pipeline removed")
type Runner struct {
Logger lager.Logger
DB db.PipelineDB
Scheduler BuildScheduler
Noop bool
Interval time.Duration
}
func (runner *Runner) Run(signals <-chan os.Signal, ready chan<- struct{}) error {
close(ready)
if runner.Interval == 0 {
panic("unconfigured scheduler interval")
}
runner.Logger.Info("start", lager.Data{
"inverval": runner.Interval.String(),
})
defer runner.Logger.Info("done")
dance:
for {
err := runner.tick(runner.Logger.Session("tick"))
if err != nil {
return err
}
select {
case <-time.After(runner.Interval):
case <-signals:
break dance
}
}
return nil
}
func (runner *Runner) tick(logger lager.Logger) error {
if runner.Noop {
return nil
}
schedulingLease, acquired, err := runner.DB.AcquireSchedulingLock(logger, runner.Interval)
if err != nil {
logger.Error("failed-to-acquire-scheduling-lock", err)
return nil
}
if !acquired {
return nil
}
defer schedulingLease.Release()
start := time.Now()
defer func() {
metric.SchedulingFullDuration{
PipelineName: runner.DB.GetPipelineName(),
Duration: time.Since(start),
}.Emit(logger)
}()
versions, err := runner.DB.LoadVersionsDB()
if err != nil {
logger.Error("failed-to-load-versions-db", err)
return err
}
metric.SchedulingLoadVersionsDuration{
PipelineName: runner.DB.GetPipelineName(),
Duration: time.Since(start),
}.Emit(logger)
found, err := runner.DB.Reload()
if err != nil {
logger.Error("failed-to-update-pipeline-config", err)
return nil
}
if !found {
return errPipelineRemoved
}
config := runner.DB.Config()
sLog := logger.Session("scheduling")
schedulingTimes, err := runner.Scheduler.Schedule(sLog, versions, config.Jobs, config.Resources, config.ResourceTypes)
for jobName, duration := range schedulingTimes {
metric.SchedulingJobDuration{
PipelineName: runner.DB.GetPipelineName(),
JobName: jobName,
Duration: duration,
}.Emit(sLog)
}
return err
}