-
Notifications
You must be signed in to change notification settings - Fork 1.1k
/
message_router.go
111 lines (99 loc) · 3.7 KB
/
message_router.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
// 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 (
"bytes"
"github.com/golang/protobuf/jsonpb"
"github.com/golang/protobuf/proto"
"github.com/heroiclabs/nakama/rtapi"
"go.uber.org/zap"
)
// Deferred message expected to be batched with other deferred messages.
// All deferred messages in a batch are expected to be for the same stream/mode and share a logger context.
type DeferredMessage struct {
PresenceIDs []*PresenceID
Envelope *rtapi.Envelope
}
// 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)
SendDeferred(*zap.Logger, bool, uint8, []*DeferredMessage)
}
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
}
// Prepare payload variables but do not initialize until we hit a session that needs them to avoid unnecessary work.
var payloadProtobuf []byte
var payloadJson []byte
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
}
var err error
switch session.Format() {
case SessionFormatProtobuf:
if payloadProtobuf == nil {
// Marshal the payload now that we know this format is needed.
payloadProtobuf, err = proto.Marshal(envelope)
if err != nil {
logger.Error("Could not marshal message", zap.Error(err))
return
}
}
err = session.SendBytes(isStream, mode, payloadProtobuf)
case SessionFormatJson:
fallthrough
default:
if payloadJson == nil {
// Marshal the payload now that we know this format is needed.
var buf bytes.Buffer
if err = r.jsonpbMarshaler.Marshal(&buf, envelope); err == nil {
payloadJson = buf.Bytes()
} else {
logger.Error("Could not marshal message", zap.Error(err))
return
}
}
err = session.SendBytes(isStream, mode, payloadJson)
}
if err != nil {
logger.Error("Failed to route message", 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)
}
func (r *LocalMessageRouter) SendDeferred(logger *zap.Logger, isStream bool, mode uint8, messages []*DeferredMessage) {
for _, message := range messages {
r.SendToPresenceIDs(logger, message.PresenceIDs, isStream, mode, message.Envelope)
}
}