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buildstarter.go
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buildstarter.go
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package scheduler
import (
"code.cloudfoundry.org/lager"
"github.com/concourse/atc"
"github.com/concourse/atc/config"
"github.com/concourse/atc/db"
"github.com/concourse/atc/db/algorithm"
"github.com/concourse/atc/engine"
"github.com/concourse/atc/scheduler/inputmapper"
"github.com/concourse/atc/scheduler/maxinflight"
)
//go:generate counterfeiter . BuildStarter
type BuildStarter interface {
TryStartPendingBuildsForJob(
logger lager.Logger,
jobConfig atc.JobConfig,
resourceConfigs atc.ResourceConfigs,
resourceTypes atc.VersionedResourceTypes,
nextPendingBuilds []db.Build,
) error
}
//go:generate counterfeiter . BuildStarterDB
type BuildStarterDB interface {
GetNextBuildInputs(jobName string) ([]db.BuildInput, bool, error)
IsPaused() (bool, error)
GetJob(job string) (db.SavedJob, bool, error)
UpdateBuildToScheduled(int) (bool, error)
UseInputsForBuild(buildID int, inputs []db.BuildInput) error
LoadVersionsDB() (*algorithm.VersionsDB, error)
}
//go:generate counterfeiter . BuildStarterBuildsDB
type BuildStarterBuildsDB interface {
FinishBuild(buildID int, pipelineID int, status db.Status) error
}
//go:generate counterfeiter . BuildFactory
type BuildFactory interface {
Create(atc.JobConfig, atc.ResourceConfigs, atc.VersionedResourceTypes, []db.BuildInput) (atc.Plan, error)
}
func NewBuildStarter(
db BuildStarterDB,
maxInFlightUpdater maxinflight.Updater,
factory BuildFactory,
scanner Scanner,
inputMapper inputmapper.InputMapper,
execEngine engine.Engine,
) BuildStarter {
return &buildStarter{
db: db,
maxInFlightUpdater: maxInFlightUpdater,
factory: factory,
scanner: scanner,
inputMapper: inputMapper,
execEngine: execEngine,
}
}
type buildStarter struct {
db BuildStarterDB
maxInFlightUpdater maxinflight.Updater
factory BuildFactory
execEngine engine.Engine
scanner Scanner
inputMapper inputmapper.InputMapper
}
func (s *buildStarter) TryStartPendingBuildsForJob(
logger lager.Logger,
jobConfig atc.JobConfig,
resourceConfigs atc.ResourceConfigs,
resourceTypes atc.VersionedResourceTypes,
nextPendingBuildsForJob []db.Build,
) error {
for _, nextPendingBuild := range nextPendingBuildsForJob {
started, err := s.tryStartNextPendingBuild(logger, nextPendingBuild, jobConfig, resourceConfigs, resourceTypes)
if err != nil {
return err
}
if !started {
break // stop scheduling next builds after failing to schedule a build
}
}
return nil
}
func (s *buildStarter) tryStartNextPendingBuild(
logger lager.Logger,
nextPendingBuild db.Build,
jobConfig atc.JobConfig,
resourceConfigs atc.ResourceConfigs,
resourceTypes atc.VersionedResourceTypes,
) (bool, error) {
logger = logger.Session("try-start-next-pending-build", lager.Data{
"build-id": nextPendingBuild.ID(),
"build-name": nextPendingBuild.Name(),
})
reachedMaxInFlight, err := s.maxInFlightUpdater.UpdateMaxInFlightReached(logger, jobConfig, nextPendingBuild.ID())
if err != nil {
return false, err
}
if reachedMaxInFlight {
return false, nil
}
if nextPendingBuild.IsManuallyTriggered() {
jobBuildInputs := config.JobInputs(jobConfig)
for _, input := range jobBuildInputs {
scanLog := logger.Session("scan", lager.Data{
"input": input.Name,
"resource": input.Resource,
})
err := s.scanner.Scan(scanLog, input.Resource)
if err != nil {
return false, err
}
}
versions, err := s.db.LoadVersionsDB()
if err != nil {
logger.Error("failed-to-load-versions-db", err)
return false, err
}
_, err = s.inputMapper.SaveNextInputMapping(logger, versions, jobConfig)
if err != nil {
return false, err
}
}
buildInputs, found, err := s.db.GetNextBuildInputs(nextPendingBuild.JobName())
if err != nil {
logger.Error("failed-to-get-next-build-inputs", err)
return false, err
}
if !found {
return false, nil
}
pipelinePaused, err := s.db.IsPaused()
if err != nil {
logger.Error("failed-to-check-if-pipeline-is-paused", err)
return false, err
}
if pipelinePaused {
return false, nil
}
job, found, err := s.db.GetJob(nextPendingBuild.JobName())
if err != nil {
logger.Error("failed-to-check-if-job-is-paused", err)
return false, err
}
if !found {
logger.Debug("job-not-found")
return false, nil
}
if job.Paused {
return false, nil
}
updated, err := s.db.UpdateBuildToScheduled(nextPendingBuild.ID())
if err != nil {
logger.Error("failed-to-update-build-to-scheduled", err)
return false, err
}
if !updated {
logger.Debug("build-already-scheduled")
return false, nil
}
err = s.db.UseInputsForBuild(nextPendingBuild.ID(), buildInputs)
if err != nil {
return false, err
}
plan, err := s.factory.Create(jobConfig, resourceConfigs, resourceTypes, buildInputs)
if err != nil {
// Don't use ErrorBuild because it logs a build event, and this build hasn't started
err := nextPendingBuild.Finish(db.StatusErrored)
if err != nil {
logger.Error("failed-to-mark-build-as-errored", err)
}
return false, nil
}
createdBuild, err := s.execEngine.CreateBuild(logger, nextPendingBuild, plan)
if err != nil {
logger.Error("failed-to-create-build", err)
return false, nil
}
logger.Info("starting")
go createdBuild.Resume(logger)
return true, nil
}