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spaces_fetcher.go
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/
spaces_fetcher.go
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package spaces_fetcher
import (
"context"
"fmt"
"sync"
"time"
"code.cloudfoundry.org/lager"
cfclient "github.com/cloudfoundry-community/go-cfclient"
)
type SpacesStore interface {
GetSpaces() []cfclient.Space
}
type SpacesFetcher struct {
Spaces []cfclient.Space
schedule time.Duration
logger lager.Logger
cfClient cfclient.CloudFoundryClient
mu sync.Mutex
}
func NewSpacesFetcher(
schedule time.Duration,
logger lager.Logger,
cfClient cfclient.CloudFoundryClient,
) *SpacesFetcher {
logger = logger.Session("spaces-fetcher")
return &SpacesFetcher{
schedule: schedule,
logger: logger,
cfClient: cfClient,
}
}
func (fetcher *SpacesFetcher) GetSpaces() []cfclient.Space {
fetcher.mu.Lock()
defer fetcher.mu.Unlock()
return fetcher.Spaces
}
func (fetcher *SpacesFetcher) Run(ctx context.Context) error {
loggerSession := fetcher.logger.Session("run")
loggerSession.Info("start")
defer loggerSession.Info("end")
err := fetcher.updateSpaces()
if err != nil {
return fmt.Errorf("error initialising list of spaces: %v", err)
}
for {
select {
case <-ctx.Done():
loggerSession.Info("done")
return nil
case <-time.After(fetcher.schedule):
err = fetcher.updateSpaces()
if err != nil {
return fmt.Errorf("error updating list of spaces: %v", err)
}
}
}
}
func (fetcher *SpacesFetcher) updateSpaces() error {
// FIXME: Relax this locking so it is short-lived
fetcher.mu.Lock()
defer fetcher.mu.Unlock()
spaces, err := fetcher.cfClient.ListSpaces()
if err != nil {
return fmt.Errorf("error fetching spaces: %v", err)
}
if spaces == nil {
return fmt.Errorf("list of spaces was nil")
}
fetcher.logger.Info("updated-spaces", lager.Data{
"number-of-spaces": len(spaces),
})
fetcher.logger.Debug("updated-spaces-list", lager.Data{
"spaces": spaces,
})
fetcher.Spaces = spaces
return nil
}
var _ SpacesStore = (*SpacesFetcher)(nil)