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/
handler.go
126 lines (107 loc) · 3.35 KB
/
handler.go
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/*
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
*/
package producer
import (
"fmt"
pb "github.com/openblockchain/obc-peer/protos"
)
type handler struct {
ChatStream pb.OpenchainEvents_ChatServer
doneChan chan bool
registered bool
interestedEvents map[string]*pb.Interest
}
func newOpenchainEventHandler(stream pb.OpenchainEvents_ChatServer) (*handler, error) {
d := &handler{
ChatStream: stream,
}
d.doneChan = make(chan bool)
return d, nil
}
// Stop stops this handler
func (d *handler) Stop() error {
d.deregister()
d.doneChan <- true
d.registered = false
return nil
}
func (d *handler) register(iEvents []*pb.Interest) error {
//TODO add the handler to the map for the interested events
//if successfully done, continue....
d.interestedEvents = make(map[string]*pb.Interest)
for _, v := range iEvents {
if ie, ok := d.interestedEvents[v.EventType]; ok {
producerLogger.Error(fmt.Sprintf("event %s already registered", v.EventType))
ie.ResponseType = v.ResponseType
continue
}
if err := registerHandler(v, d); err != nil {
producerLogger.Error(fmt.Sprintf("could not register %s", v))
continue
}
d.interestedEvents[v.EventType] = v
}
return nil
}
func (d *handler) deregister() {
for k, v := range d.interestedEvents {
var ie *pb.Interest
var ok bool
if ie, ok = d.interestedEvents[k]; !ok {
continue
}
if err := deRegisterHandler(v, d); err != nil {
producerLogger.Error(fmt.Sprintf("could not register %s", k))
continue
}
delete(d.interestedEvents, ie.EventType)
}
}
func (d *handler) responseType(eventType string) pb.Interest_ResponseType {
rType := pb.Interest_DONTSEND
if d.registered {
if ie, _ := d.interestedEvents[eventType]; ie != nil {
rType = ie.ResponseType
}
}
return rType
}
// HandleMessage handles the Openchain messages for the Peer.
func (d *handler) HandleMessage(msg *pb.OpenchainEvent) error {
producerLogger.Debug("Handling OpenchainEvent")
eventsObj := msg.GetRegister()
if eventsObj == nil {
return fmt.Errorf("Invalid object from consumer %v", msg.GetEvent())
}
if err := d.register(eventsObj.Events); err != nil {
return fmt.Errorf("Could not register events %s", err)
}
//TODO return supported events.. for now just return the received msg
if err := d.ChatStream.Send(msg); err != nil {
return fmt.Errorf("Error sending response to %v: %s", msg, err)
}
d.registered = true
return nil
}
// SendMessage sends a message to the remote PEER through the stream
func (d *handler) SendMessage(msg *pb.OpenchainEvent) error {
err := d.ChatStream.Send(msg)
if err != nil {
return fmt.Errorf("Error Sending message through ChatStream: %s", err)
}
return nil
}