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message_router.go
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message_router.go
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// Copyright 2018 The Nakama Authors
//
// Licensed 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 server
import (
"github.com/golang/protobuf/jsonpb"
"github.com/heroiclabs/nakama/rtapi"
"go.uber.org/zap"
)
// MessageRouter is responsible for sending a message to a list of presences or to an entire stream.
type MessageRouter interface {
SendToPresenceIDs(*zap.Logger, []*PresenceID, bool, uint8, *rtapi.Envelope)
SendToStream(*zap.Logger, PresenceStream, *rtapi.Envelope)
}
type LocalMessageRouter struct {
jsonpbMarshaler *jsonpb.Marshaler
sessionRegistry *SessionRegistry
tracker Tracker
}
func NewLocalMessageRouter(sessionRegistry *SessionRegistry, tracker Tracker, jsonpbMarshaler *jsonpb.Marshaler) MessageRouter {
return &LocalMessageRouter{
jsonpbMarshaler: jsonpbMarshaler,
sessionRegistry: sessionRegistry,
tracker: tracker,
}
}
func (r *LocalMessageRouter) SendToPresenceIDs(logger *zap.Logger, presenceIDs []*PresenceID, isStream bool, mode uint8, envelope *rtapi.Envelope) {
if len(presenceIDs) == 0 {
return
}
payload, err := r.jsonpbMarshaler.MarshalToString(envelope)
if err != nil {
logger.Error("Could not marshall message to json", zap.Error(err))
return
}
payloadBytes := []byte(payload)
for _, presenceID := range presenceIDs {
session := r.sessionRegistry.Get(presenceID.SessionID)
if session == nil {
logger.Debug("No session to route to", zap.String("sid", presenceID.SessionID.String()))
continue
}
if err := session.SendBytes(isStream, mode, payloadBytes); err != nil {
logger.Error("Failed to route to", zap.String("sid", presenceID.SessionID.String()), zap.Error(err))
}
}
}
func (r *LocalMessageRouter) SendToStream(logger *zap.Logger, stream PresenceStream, envelope *rtapi.Envelope) {
presenceIDs := r.tracker.ListPresenceIDByStream(stream)
r.SendToPresenceIDs(logger, presenceIDs, true, stream.Mode, envelope)
}