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pool.go
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/
pool.go
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package worker
import (
"context"
"errors"
"fmt"
"math/rand"
"time"
"code.cloudfoundry.org/clock"
"code.cloudfoundry.org/lager"
"github.com/concourse/atc"
"github.com/concourse/atc/creds"
"github.com/concourse/atc/db"
)
//go:generate counterfeiter . WorkerProvider
type WorkerProvider interface {
RunningWorkers(lager.Logger) ([]Worker, error)
FindWorkerForContainer(
logger lager.Logger,
teamID int,
handle string,
) (Worker, bool, error)
FindWorkerForContainerByOwner(
logger lager.Logger,
teamID int,
owner db.ContainerOwner,
) (Worker, bool, error)
NewGardenWorker(
logger lager.Logger,
tikTok clock.Clock,
savedWorker db.Worker,
) Worker
}
var (
ErrNoWorkers = errors.New("no workers")
)
type NoCompatibleWorkersError struct {
Spec WorkerSpec
Workers []Worker
}
func (err NoCompatibleWorkersError) Error() string {
availableWorkers := ""
for _, worker := range err.Workers {
availableWorkers += "\n - " + worker.Description()
}
return fmt.Sprintf(
"no workers satisfying: %s\n\navailable workers: %s",
err.Spec.Description(),
availableWorkers,
)
}
type pool struct {
provider WorkerProvider
rand *rand.Rand
strategy ContainerPlacementStrategy
}
func NewPool(provider WorkerProvider, strategy ContainerPlacementStrategy) Client {
return &pool{
provider: provider,
rand: rand.New(rand.NewSource(time.Now().UnixNano())),
strategy: strategy,
}
}
func (pool *pool) RunningWorkers(logger lager.Logger) ([]Worker, error) {
return pool.provider.RunningWorkers(logger)
}
func (pool *pool) AllSatisfying(logger lager.Logger, spec WorkerSpec, resourceTypes creds.VersionedResourceTypes) ([]Worker, error) {
workers, err := pool.provider.RunningWorkers(logger)
if err != nil {
return nil, err
}
if len(workers) == 0 {
return nil, ErrNoWorkers
}
compatibleTeamWorkers := []Worker{}
compatibleGeneralWorkers := []Worker{}
for _, worker := range workers {
satisfyingWorker, err := worker.Satisfying(logger, spec, resourceTypes)
if err == nil {
if worker.IsOwnedByTeam() {
compatibleTeamWorkers = append(compatibleTeamWorkers, satisfyingWorker)
} else {
compatibleGeneralWorkers = append(compatibleGeneralWorkers, satisfyingWorker)
}
}
}
if len(compatibleTeamWorkers) != 0 {
return compatibleTeamWorkers, nil
}
if len(compatibleGeneralWorkers) != 0 {
return compatibleGeneralWorkers, nil
}
return nil, NoCompatibleWorkersError{
Spec: spec,
Workers: workers,
}
}
func (pool *pool) Satisfying(logger lager.Logger, spec WorkerSpec, resourceTypes creds.VersionedResourceTypes) (Worker, error) {
compatibleWorkers, err := pool.AllSatisfying(logger, spec, resourceTypes)
if err != nil {
return nil, err
}
randomWorker := compatibleWorkers[pool.rand.Intn(len(compatibleWorkers))]
return randomWorker, nil
}
func (pool *pool) FindOrCreateContainer(
ctx context.Context,
logger lager.Logger,
delegate ImageFetchingDelegate,
owner db.ContainerOwner,
metadata db.ContainerMetadata,
spec ContainerSpec,
resourceTypes creds.VersionedResourceTypes,
) (Container, error) {
worker, found, err := pool.provider.FindWorkerForContainerByOwner(
logger.Session("find-worker"),
spec.TeamID,
owner,
)
if err != nil {
return nil, err
}
if !found {
compatibleWorkers, err := pool.AllSatisfying(logger, spec.WorkerSpec(), resourceTypes)
if err != nil {
return nil, err
}
worker, err = pool.strategy.Choose(compatibleWorkers, spec)
if err != nil {
return nil, err
}
}
return worker.FindOrCreateContainer(
ctx,
logger,
delegate,
owner,
metadata,
spec,
resourceTypes,
)
}
func (pool *pool) FindContainerByHandle(logger lager.Logger, teamID int, handle string) (Container, bool, error) {
worker, found, err := pool.provider.FindWorkerForContainer(
logger.Session("find-worker"),
teamID,
handle,
)
if err != nil {
return nil, false, err
}
if !found {
return nil, false, nil
}
return worker.FindContainerByHandle(logger, teamID, handle)
}
func (*pool) FindResourceTypeByPath(string) (atc.WorkerResourceType, bool) {
return atc.WorkerResourceType{}, false
}
func (*pool) LookupVolume(lager.Logger, string) (Volume, bool, error) {
return nil, false, errors.New("LookupVolume not implemented for pool")
}