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runner.go
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runner.go
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package radar
import (
"os"
"time"
"code.cloudfoundry.org/lager"
"github.com/concourse/atc/dbng"
"github.com/tedsuo/ifrit"
"github.com/tedsuo/ifrit/grouper"
)
//go:generate counterfeiter . ScanRunnerFactory
type Runner struct {
logger lager.Logger
noop bool
scanRunnerFactory ScanRunnerFactory
pipeline dbng.Pipeline
syncInterval time.Duration
}
func NewRunner(
logger lager.Logger,
noop bool,
scanRunnerFactory ScanRunnerFactory,
pipeline dbng.Pipeline,
syncInterval time.Duration,
) *Runner {
return &Runner{
logger: logger,
noop: noop,
scanRunnerFactory: scanRunnerFactory,
pipeline: pipeline,
syncInterval: syncInterval,
}
}
func (runner *Runner) Run(signals <-chan os.Signal, ready chan<- struct{}) error {
close(ready)
if runner.noop {
<-signals
return nil
}
runner.logger.Info("start")
defer runner.logger.Info("done")
ticker := time.NewTicker(runner.syncInterval)
scannersGroup := grouper.NewDynamic(nil, 0, 0)
scannersClient := scannersGroup.Client()
exits := scannersClient.ExitListener()
insertScanner := scannersClient.Inserter()
scanners := ifrit.Invoke(scannersGroup)
scanning := make(map[string]bool)
scanningResourceTypes := make(map[string]bool)
runner.tick(scanning, scanningResourceTypes, insertScanner)
dance:
for {
select {
case <-signals:
scanners.Signal(os.Interrupt)
// don't bother waiting for scanners on shutdown
break dance
case exited := <-exits:
if exited.Err != nil {
runner.logger.Error("scanner-failed", exited.Err, lager.Data{
"member": exited.Member.Name,
})
} else {
runner.logger.Info("scanner-exited", lager.Data{
"member": exited.Member.Name,
})
}
delete(scanning, exited.Member.Name)
delete(scanningResourceTypes, exited.Member.Name)
case <-ticker.C:
runner.tick(scanning, scanningResourceTypes, insertScanner)
}
}
return nil
}
func (runner *Runner) tick(
scanning map[string]bool,
scanningResourceTypes map[string]bool,
insertScanner chan<- grouper.Member,
) {
found, err := runner.pipeline.Reload()
if err != nil {
runner.logger.Error("failed-to-reload-pipeline", err)
return
}
if !found {
runner.logger.Info("pipeline-removed")
return
}
config, _, _, err := runner.pipeline.Config()
if err != nil {
runner.logger.Error("failed-to-get-config", err)
return
}
for _, resourceType := range config.ResourceTypes {
scopedName := runner.pipeline.ScopedName("resource-type:" + resourceType.Name)
if scanningResourceTypes[scopedName] {
continue
}
scanningResourceTypes[scopedName] = true
logger := runner.logger.Session("scan-resource-type", lager.Data{
"pipeline-scoped-name": scopedName,
})
runner := runner.scanRunnerFactory.ScanResourceTypeRunner(logger, resourceType.Name)
// avoid deadlock if exit event is blocked; inserting in this case
// will block on the event being consumed (which is in this select)
go func(name string) {
insertScanner <- grouper.Member{
Name: name,
Runner: runner,
}
}(scopedName)
}
for _, resource := range config.Resources {
scopedName := runner.pipeline.ScopedName("resource:" + resource.Name)
if scanning[scopedName] {
continue
}
scanning[scopedName] = true
logger := runner.logger.Session("scan-resource", lager.Data{
"pipeline-scoped-name": scopedName,
})
runner := runner.scanRunnerFactory.ScanResourceRunner(logger, resource.Name)
// avoid deadlock if exit event is blocked; inserting in this case
// will block on the event being consumed (which is in this select)
go func(name string) {
insertScanner <- grouper.Member{
Name: name,
Runner: runner,
}
}(scopedName)
}
}