Datasets:
MIN12352
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codeparrot

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var (
// bufferSize represents the index notification buffer size.
bufferSize = 128
// noPrereqs indicates no index prerequisites.
noPrereqs = ""none""
)
// IndexNtfn represents an index notification detailing a block connection
// or disconnection.
type IndexNtfn struct {
NtfnType IndexNtfnType
Block *dcrutil.Block
Parent *dcrutil.Block
PrevScripts PrevScripter
IsTreasuryEnabled bool
Done chan bool
}
// IndexSubscription represents a subscription for index updates.
type IndexSubscription struct {
id string
idx Indexer
subscriber *IndexSubscriber
mtx sync.Mutex
// prerequisite defines the notification processing hierarchy for this
// subscription. It is expected that the subscriber associated with the
// prerequisite provided processes notifications before they are
// delivered by this subscription to its subscriber. An empty string
// indicates the subscription has no prerequisite.
prerequisite string
// dependent defines the index subscription that requires the subscriber
// associated with this subscription to have processed incoming
// notifications before it does. A nil dependency indicates the subscription
// has no dependencies.
dependent *IndexSubscription
}
// newIndexSubscription initializes a new index subscription.
func newIndexSubscription(subber *IndexSubscriber, indexer Indexer, prereq string) *IndexSubscription {
return &IndexSubscription{
id: indexer.Name(),
idx: indexer,
prerequisite: prereq,
subscriber: subber,
}
}
// stop prevents any future index updates from being delivered and
// unsubscribes the associated subscription.
func (s *IndexSubscription) stop() error {
// If the subscription has a prerequisite, find it and remove the
// subscription as a dependency.
if s.prerequisite != noPrereqs {
s.mtx.Lock()
prereq, ok := s.subscriber.subscriptions[s.prerequisite]
s.mtx.Unlock()
if !ok {
return fmt.Errorf(""no subscription found with id %s"", s.prerequisite)
}
prereq.mtx.Lock()
prereq.dependent = nil
prereq.mtx.Unlock()
return nil
}
// If the subscription has a dependent, stop it as well.
if s.dependent != nil {
err := s.dependent.stop()
if err != nil {
return err
}
}
// If the subscription is independent, remove it from the
// index subscriber's subscriptions.
s.mtx.Lock()
delete(s.subscriber.subscriptions, s.id)
s.mtx.Unlock()
return nil
}
// IndexSubscriber subscribes clients for index updates.
type IndexSubscriber struct {
subscribers uint32 // update atomically.
c chan IndexNtfn
subscriptions map[string]*IndexSubscription
mtx sync.Mutex
ctx context.Context
cancel context.CancelFunc
quit chan struct{}
}