/
publisher.go
64 lines (54 loc) · 1.77 KB
/
publisher.go
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package publisher
import (
"fmt"
"github.com/cskr/pubsub"
"github.com/mesg-foundation/engine/cosmos"
"github.com/mesg-foundation/engine/event"
"github.com/mesg-foundation/engine/hash"
"github.com/mesg-foundation/engine/instance"
"github.com/mesg-foundation/engine/protobuf/types"
"github.com/mesg-foundation/engine/service"
instancemodule "github.com/mesg-foundation/engine/x/instance"
servicemodule "github.com/mesg-foundation/engine/x/service"
)
const (
// streamTopic is topic used to broadcast events.
streamTopic = "event-stream"
)
// EventPublisher exposes event APIs of MESG.
type EventPublisher struct {
ps *pubsub.PubSub
rpc *cosmos.RPC
}
// New creates a new Event SDK with given options.
func New(rpc *cosmos.RPC) *EventPublisher {
return &EventPublisher{
ps: pubsub.New(0),
rpc: rpc,
}
}
// Publish a MESG event eventKey with eventData for service token.
func (ep *EventPublisher) Publish(instanceHash hash.Hash, eventKey string, eventData *types.Struct) (*event.Event, error) {
var i *instance.Instance
route := fmt.Sprintf("custom/%s/%s/%s", instancemodule.QuerierRoute, instancemodule.QueryGet, instanceHash)
if err := ep.rpc.QueryJSON(route, nil, &i); err != nil {
return nil, err
}
var s *service.Service
route = fmt.Sprintf("custom/%s/%s/%s", servicemodule.QuerierRoute, servicemodule.QueryGet, i.ServiceHash)
if err := ep.rpc.QueryJSON(route, nil, &s); err != nil {
return nil, err
}
if err := s.RequireEventData(eventKey, eventData); err != nil {
return nil, err
}
e := event.New(instanceHash, eventKey, eventData)
go ep.ps.Pub(e, streamTopic)
return e, nil
}
// GetStream broadcasts all events.
func (ep *EventPublisher) GetStream(f *event.Filter) *event.Listener {
l := event.NewListener(ep.ps, streamTopic, f)
go l.Listen()
return l
}