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exec_engine.go
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exec_engine.go
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package engine
import (
"encoding/json"
"strconv"
"strings"
"os"
"code.cloudfoundry.org/lager"
"github.com/concourse/atc"
"github.com/concourse/atc/db"
"github.com/concourse/atc/exec"
"github.com/concourse/atc/worker"
"github.com/tedsuo/ifrit"
)
type execMetadata struct {
Plan atc.Plan
}
const execEngineName = "exec.v2"
type execEngine struct {
factory exec.Factory
delegateFactory BuildDelegateFactory
externalURL string
releaseCh chan struct{}
}
func NewExecEngine(
factory exec.Factory,
delegateFactory BuildDelegateFactory,
externalURL string,
) Engine {
return &execEngine{
factory: factory,
delegateFactory: delegateFactory,
externalURL: externalURL,
releaseCh: make(chan struct{}),
}
}
func (engine *execEngine) Name() string {
return execEngineName
}
func (engine *execEngine) CreateBuild(logger lager.Logger, build db.Build, plan atc.Plan) (Build, error) {
return &execBuild{
dbBuild: build,
stepMetadata: buildMetadata(build, engine.externalURL),
factory: engine.factory,
delegate: engine.delegateFactory.Delegate(build),
metadata: execMetadata{
Plan: plan,
},
releaseCh: engine.releaseCh,
signals: make(chan os.Signal, 1),
}, nil
}
func (engine *execEngine) LookupBuild(logger lager.Logger, build db.Build) (Build, error) {
var metadata execMetadata
err := json.Unmarshal([]byte(build.EngineMetadata()), &metadata)
if err != nil {
logger.Error("invalid-metadata", err)
return nil, err
}
return &execBuild{
dbBuild: build,
stepMetadata: buildMetadata(build, engine.externalURL),
factory: engine.factory,
delegate: engine.delegateFactory.Delegate(build),
metadata: metadata,
releaseCh: engine.releaseCh,
signals: make(chan os.Signal, 1),
}, nil
}
func (engine *execEngine) ReleaseAll(logger lager.Logger) {
logger.Info("calling-release-in-exec-engine")
close(engine.releaseCh)
}
func buildMetadata(build db.Build, externalURL string) StepMetadata {
return StepMetadata{
BuildID: build.ID(),
BuildName: build.Name(),
JobName: build.JobName(),
PipelineName: build.PipelineName(),
TeamName: build.TeamName(),
ExternalURL: externalURL,
}
}
type execBuild struct {
dbBuild db.Build
stepMetadata StepMetadata
factory exec.Factory
delegate BuildDelegate
signals chan os.Signal
releaseCh chan struct{}
metadata execMetadata
}
func (build *execBuild) Metadata() string {
payload, err := json.Marshal(build.metadata)
if err != nil {
panic("failed to marshal build metadata: " + err.Error())
}
return string(payload)
}
func (build *execBuild) Abort(lager.Logger) error {
build.signals <- os.Kill
return nil
}
func (build *execBuild) Resume(logger lager.Logger) {
stepFactory := build.buildStepFactory(logger, build.metadata.Plan)
source := stepFactory.Using(worker.NewArtifactRepository())
process := ifrit.Background(source)
exited := process.Wait()
aborted := false
var succeeded bool
for {
select {
case <-build.releaseCh:
logger.Info("releasing")
return
case err := <-exited:
if !aborted {
succeeded = source.Succeeded()
}
build.delegate.Finish(logger.Session("finish"), err, exec.Success(succeeded), aborted)
return
case sig := <-build.signals:
process.Signal(sig)
if sig == os.Kill {
aborted = true
}
}
}
}
func (build *execBuild) buildStepFactory(logger lager.Logger, plan atc.Plan) exec.StepFactory {
if plan.Aggregate != nil {
return build.buildAggregateStep(logger, plan)
}
if plan.Do != nil {
return build.buildDoStep(logger, plan)
}
if plan.Timeout != nil {
return build.buildTimeoutStep(logger, plan)
}
if plan.Try != nil {
return build.buildTryStep(logger, plan)
}
if plan.OnSuccess != nil {
return build.buildOnSuccessStep(logger, plan)
}
if plan.OnFailure != nil {
return build.buildOnFailureStep(logger, plan)
}
if plan.Ensure != nil {
return build.buildEnsureStep(logger, plan)
}
if plan.Task != nil {
return build.buildTaskStep(logger, plan)
}
if plan.Get != nil {
return build.buildGetStep(logger, plan)
}
if plan.Put != nil {
return build.buildPutStep(logger, plan)
}
if plan.Retry != nil {
return build.buildRetryStep(logger, plan)
}
return exec.Identity{}
}
func (build *execBuild) containerMetadata(
containerType db.ContainerType,
stepName string,
attempts []int,
) db.ContainerMetadata {
attemptStrs := []string{}
for _, a := range attempts {
attemptStrs = append(attemptStrs, strconv.Itoa(a))
}
return db.ContainerMetadata{
Type: containerType,
PipelineID: build.dbBuild.PipelineID(),
JobID: build.dbBuild.JobID(),
BuildID: build.dbBuild.ID(),
PipelineName: build.dbBuild.PipelineName(),
JobName: build.dbBuild.JobName(),
BuildName: build.dbBuild.Name(),
StepName: stepName,
Attempt: strings.Join(attemptStrs, "."),
}
}