-
Notifications
You must be signed in to change notification settings - Fork 12
/
handler.go
286 lines (239 loc) · 7.79 KB
/
handler.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
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
package mqtt
import (
"context"
"fmt"
"strings"
"time"
"github.com/MainfluxLabs/mainflux"
"github.com/MainfluxLabs/mainflux/logger"
"github.com/MainfluxLabs/mainflux/mqtt/redis"
"github.com/MainfluxLabs/mainflux/pkg/auth"
"github.com/MainfluxLabs/mainflux/pkg/errors"
"github.com/MainfluxLabs/mainflux/pkg/messaging"
"github.com/MainfluxLabs/mproxy/pkg/session"
)
var _ session.Handler = (*handler)(nil)
const (
protocol = "mqtt"
connected = "connected"
)
const (
LogInfoSubscribed = "subscribed with client_id %s to topics %s"
LogInfoUnsubscribed = "unsubscribed client_id %s from topics %s"
LogInfoConnected = "connected with client_id %s"
LogInfoDisconnected = "disconnected client_id %s and username %s"
LogInfoPublished = "published with client_id %s to the topic %s"
LogErrFailedConnect = "failed to connect: "
LogErrFailedSubscribe = "failed to subscribe: "
LogErrFailedUnsubscribe = "failed to unsubscribe: "
LogErrFailedPublish = "failed to publish: "
LogErrFailedDisconnect = "failed to disconnect: "
LogErrFailedPublishDisconnectEvent = "failed to publish disconnect event: "
logErrFailedParseSubtopic = "failed to parse subtopic: "
LogErrFailedPublishConnectEvent = "failed to publish connect event: "
LogErrFailedPublishToMsgBroker = "failed to publish to mainflux message broker: "
)
var (
ErrMalformedSubtopic = errors.New("malformed subtopic")
ErrClientNotInitialized = errors.New("client is not initialized")
ErrMalformedTopic = errors.New("malformed topic")
ErrMissingClientID = errors.New("client_id not found")
ErrMissingTopicPub = errors.New("failed to publish due to missing topic")
ErrMissingTopicSub = errors.New("failed to subscribe due to missing topic")
ErrAuthentication = errors.New("failed to perform authentication over the entity")
ErrSubscriptionAlreadyExists = errors.New("subscription already exists")
)
// Event implements events.Event interface
type handler struct {
publishers []messaging.Publisher
auth auth.Client
logger logger.Logger
es redis.EventStore
service Service
}
// NewHandler creates new Handler entity
func NewHandler(publishers []messaging.Publisher, es redis.EventStore,
logger logger.Logger, auth auth.Client, svc Service) session.Handler {
return &handler{
es: es,
logger: logger,
publishers: publishers,
auth: auth,
service: svc,
}
}
// AuthConnect is called on device connection,
// prior forwarding to the MQTT broker
func (h *handler) AuthConnect(c *session.Client) error {
if c == nil {
return ErrClientNotInitialized
}
if c.ID == "" {
return ErrMissingClientID
}
thid, err := h.auth.Identify(context.Background(), string(c.Password))
if err != nil {
return err
}
if thid != c.Username {
return errors.ErrAuthentication
}
if err := h.es.Connect(c.Username); err != nil {
h.logger.Error(LogErrFailedPublishConnectEvent + err.Error())
}
return nil
}
// AuthPublish is called on device publish,
// prior forwarding to the MQTT broker
func (h *handler) AuthPublish(c *session.Client, topic *string, payload *[]byte) error {
if c == nil {
return ErrClientNotInitialized
}
if topic == nil {
return ErrMissingTopicPub
}
if _, err := h.authAccess(c); err != nil {
return err
}
return nil
}
// AuthSubscribe is called on device subscribe,
// prior creating a subscription on the MQTT broker
func (h *handler) AuthSubscribe(c *session.Client, topics *[]string) error {
if c == nil {
return ErrClientNotInitialized
}
if topics == nil || *topics == nil {
return ErrMissingTopicSub
}
if _, err := h.authAccess(c); err != nil {
return err
}
return nil
}
// Connect - after client successfully connected
func (h *handler) Connect(c *session.Client) {
if c == nil {
h.logger.Error(LogErrFailedConnect + (ErrClientNotInitialized).Error())
return
}
h.logger.Info(fmt.Sprintf(LogInfoConnected, c.ID))
}
// Publish - after client successfully published
func (h *handler) Publish(c *session.Client, topic *string, payload *[]byte) {
if c == nil {
h.logger.Error(LogErrFailedPublish + ErrClientNotInitialized.Error())
return
}
h.logger.Info(fmt.Sprintf(LogInfoPublished, c.ID, *topic))
// Topics are in the format:
// channels/<channel_id>/messages/<subtopic>/.../ct/<content_type>
subtopic, err := messaging.ExtractSubtopic(*topic)
if err != nil {
h.logger.Error(LogErrFailedPublish + (ErrMalformedTopic).Error())
return
}
subject, err := messaging.CreateSubject(subtopic)
if err != nil {
h.logger.Error(logErrFailedParseSubtopic + err.Error())
return
}
conn, err := h.auth.GetConnByKey(context.Background(), string(c.Password))
if err != nil {
h.logger.Error(LogErrFailedPublish + (ErrAuthentication).Error())
}
m := messaging.CreateMessage(&conn, protocol, subject, payload)
for _, pub := range h.publishers {
if err := pub.Publish(m); err != nil {
h.logger.Error(LogErrFailedPublishToMsgBroker + err.Error())
}
}
}
// Subscribe - after client successfully subscribed
func (h *handler) Subscribe(c *session.Client, topics *[]string) {
if c == nil {
h.logger.Error(LogErrFailedSubscribe + (ErrClientNotInitialized).Error())
return
}
subs, err := h.getSubcriptions(c, topics)
if err != nil {
h.logger.Error(LogErrFailedSubscribe + err.Error())
return
}
for _, s := range subs {
err = h.service.CreateSubscription(context.Background(), s)
if err != nil {
h.logger.Error(LogErrFailedSubscribe + (ErrSubscriptionAlreadyExists).Error())
return
}
}
h.logger.Info(fmt.Sprintf(LogInfoSubscribed, c.ID, strings.Join(*topics, ",")))
}
// Unsubscribe - after client unsubscribed
func (h *handler) Unsubscribe(c *session.Client, topics *[]string) {
if c == nil {
h.logger.Error(LogErrFailedUnsubscribe + (ErrClientNotInitialized).Error())
return
}
subs, err := h.getSubcriptions(c, topics)
if err != nil {
h.logger.Error(LogErrFailedSubscribe + err.Error())
return
}
for _, s := range subs {
if h.service.RemoveSubscription(context.Background(), s); err != nil {
h.logger.Error(LogErrFailedUnsubscribe + (ErrClientNotInitialized).Error())
}
}
h.logger.Info(fmt.Sprintf(LogInfoUnsubscribed, c.ID, strings.Join(*topics, ",")))
}
// Disconnect - connection with broker or client lost
func (h *handler) Disconnect(c *session.Client) {
if c == nil {
h.logger.Error(LogErrFailedDisconnect + (ErrClientNotInitialized).Error())
return
}
h.logger.Error(fmt.Sprintf(LogInfoDisconnected, c.ID, c.Username))
if err := h.es.Disconnect(c.Username); err != nil {
h.logger.Error(LogErrFailedPublishDisconnectEvent + err.Error())
}
}
func (h *handler) authAccess(c *session.Client) (mainflux.ConnByKeyRes, error) {
conn, err := h.auth.GetConnByKey(context.Background(), string(c.Password))
if err != nil {
return mainflux.ConnByKeyRes{}, err
}
if conn.ThingID != c.Username {
return mainflux.ConnByKeyRes{}, ErrAuthentication
}
return conn, nil
}
func (h *handler) getSubcriptions(c *session.Client, topics *[]string) ([]Subscription, error) {
var subs []Subscription
for _, t := range *topics {
subtopic, err := messaging.ExtractSubtopic(t)
if err != nil {
return nil, err
}
conn, err := h.auth.GetConnByKey(context.Background(), string(c.Password))
if err != nil {
return nil, err
}
subject, err := messaging.CreateSubject(subtopic)
if err != nil {
return nil, err
}
sub := Subscription{
Subtopic: subject,
ChanID: conn.ChannelID,
ThingID: c.Username,
ClientID: c.ID,
Status: connected,
CreatedAt: float64(time.Now().UnixNano()) / float64(1e9),
}
subs = append(subs, sub)
}
return subs, nil
}