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service.go
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service.go
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package estream
import (
"container/list"
"fmt"
"strconv"
"time"
"github.com/freeconf/yang/fc"
"github.com/freeconf/yang/nodeutil"
)
type Service struct {
subscriptions map[string]*Subscription
filters map[string]Filter
streams map[string]Stream
listeners *list.List
subcriptionCounter int64
}
func NewService() *Service {
return &Service{
subscriptions: make(map[string]*Subscription),
filters: make(map[string]Filter),
streams: make(map[string]Stream),
listeners: list.New(),
subcriptionCounter: 100, // starting at zero or one seems disconcerting
}
}
func (s *Service) AddFilter(f Filter) {
s.filters[f.Name] = f
}
func (s *Service) AddStream(stream Stream) {
s.streams[stream.Name] = stream
}
type eventListener func(e SubEvent)
func (s *Service) onEvent(l eventListener) nodeutil.Subscription {
return nodeutil.NewSubscription(s.listeners, s.listeners.PushBack(l))
}
type EstablishRequest struct {
Stream string
StreamFilterName string
ReplayStartTime time.Time
StopTime time.Time
}
func (s *Service) EstablishSubscription(req EstablishRequest) (*Subscription, error) {
sub := NewSubscription(s.nextSubId(), s)
var opts SubscriptionOptions
if err := s.updateFilter(&opts, req.StreamFilterName); err != nil {
return nil, err
}
if err := s.updateStream(&opts, req.Stream); err != nil {
return nil, err
}
if err := sub.Apply(opts); err != nil {
return nil, err
}
s.subscriptions[sub.Id] = sub
s.updateListeners(SubEvent{Subscription: sub, EventId: SubEventStarted})
return sub, nil
}
func (s *Service) updateFilter(opts *SubscriptionOptions, filterName string) error {
if filterName == "" {
opts.Filter = Filter{}
} else {
f, found := s.filters[filterName]
if !found {
return fmt.Errorf("filter %w %s", fc.NotFoundError, filterName)
}
opts.Filter = f
}
return nil
}
func (s *Service) updateStream(opts *SubscriptionOptions, streamName string) error {
if streamName == "" {
opts.Stream = Stream{}
} else {
s, found := s.streams[streamName]
if !found {
return fmt.Errorf("stream %w %s", fc.NotFoundError, streamName)
}
opts.Stream = s
}
return nil
}
type ModifyRequest struct {
SubscriptionId string
StreamFilterName string
StopTime time.Time
}
func (s *Service) ModifySubscription(req ModifyRequest) error {
sub, found := s.subscriptions[req.SubscriptionId]
if !found {
return fmt.Errorf("subscription %w %s", fc.NotFoundError, req.SubscriptionId)
}
opts := sub.Options()
opts.StopTime = req.StopTime
if err := s.updateFilter(&opts, req.StreamFilterName); err != nil {
return err
}
if err := sub.Apply(opts); err != nil {
return err
}
s.updateListeners(SubEvent{Subscription: sub, EventId: SubEventModified})
return nil
}
func (s *Service) updateListeners(e SubEvent) {
fc.Debug.Printf("updateListeners %v", e)
for l := s.listeners.Front(); l != nil; l = l.Next() {
l.Value.(eventListener)(e)
}
}
func (s *Service) KillSubscription(subId string) error {
return nil
}
func (s *Service) DeleteSubsccription(subId string) error {
return nil
}
func (s *Service) nextSubId() string {
var id int64
s.subcriptionCounter, id = s.subcriptionCounter+1, s.subcriptionCounter
return strconv.FormatInt(id, 10)
}