generated from daystram/go-gin-gorm-boilerplate
-
Notifications
You must be signed in to change notification settings - Fork 0
/
tracker.go
217 lines (200 loc) · 6.73 KB
/
tracker.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
package handlers
import (
"context"
"errors"
"fmt"
"log"
"net"
"strconv"
"sync"
"time"
"google.golang.org/grpc"
"github.com/daystram/audit/audit-be/constants"
"github.com/daystram/audit/audit-be/models"
pb "github.com/daystram/audit/proto"
)
type TrackerServer interface {
pb.TrackerServer
PingTracker(trackerID string) (err error)
SendTrackingRequest(request *pb.TrackingRequest) (err error)
}
type TrackerClient interface {
Ping() (err error)
SetStatus(pingTime, latency int64)
Status() (pingTime, latency int64)
SendTrackingRequest(request *pb.TrackingRequest) (err error)
}
type trackerServerModule struct {
pb.UnimplementedTrackerServer
handlers *module // injected handler module reference
trackers map[string]TrackerClient
trackerIDs []string
lastUsed int
mu sync.RWMutex
}
type trackerClientEntity struct {
id string
stream pb.Tracker_SubscribeServer
lastPinged int64
latency int64
}
func (m *module) InitializeTrackerServer(port int) (err error) {
var lis net.Listener
grpcServer := grpc.NewServer()
if lis, err = net.Listen("tcp", fmt.Sprintf("0.0.0.0:%d", port)); err != nil {
return err
}
log.Printf("[TrackerServer] starting server on 0.0.0.0:%d\n", port)
m.trackerServer = &trackerServerModule{handlers: m, trackers: make(map[string]TrackerClient), trackerIDs: make([]string, 0)}
// TODO: authentication
pb.RegisterTrackerServer(grpcServer, m.trackerServer)
go func() {
if err := grpcServer.Serve(lis); err != nil {
log.Fatalf("[TrackerServer] failed starting server. %v", err)
}
}()
return
}
// implements pb.UnimplementedTrackerServer
func (s *trackerServerModule) Subscribe(request *pb.SubscriptionRequest, stream pb.Tracker_SubscribeServer) (err error) {
trackerID := request.TrackerId
// TODO: validate client
s.mu.Lock()
if _, ok := s.trackers[trackerID]; ok {
s.mu.Unlock()
return fmt.Errorf("trackerID %s already registered", trackerID)
}
s.trackers[trackerID] = &trackerClientEntity{
id: trackerID,
stream: stream,
}
s.trackerIDs = append(s.trackerIDs, trackerID)
s.mu.Unlock() // immediately unlock
log.Printf("[TrackerServer] tracker %s connected. connected trackers: %d\n", trackerID, len(s.trackers))
return s.PingTracker(trackerID) // keep alive: locking
}
// implements pb.UnimplementedTrackerServer
func (s *trackerServerModule) ReportTrackingRequest(ctx context.Context, message *pb.TrackingMessage) (resp *pb.Empty, err error) {
response := message.Body.(*pb.TrackingMessage_Response).Response
var application models.Application
if application, err = s.handlers.db.applicationOrmer.GetOneByID(response.ApplicationId); err != nil {
return &pb.Empty{}, nil
}
var service models.Service
if service, err = s.handlers.db.serviceOrmer.GetOneByIDAndApplicationID(response.ServiceId, response.ApplicationId); err != nil {
return &pb.Empty{}, nil
}
switch response.Status {
case pb.ServiceStatus_SERVICE_STATUS_UP:
switch service.Type {
case constants.ServiceTypeHTTP:
var code int
if code, err = strconv.Atoi(response.Body); err != nil {
return &pb.Empty{}, fmt.Errorf("invalid body for HTTP service")
}
log.Printf("[TrackerServer] HTTP %s/%s -> latency:%dms, code:%d\n", application.Name, service.Name, response.ResponseTime/1e6, code)
// TODO
case constants.ServiceTypeTCP:
log.Printf("[TrackerServer] TCP %s/%s -> latency:%dms\n", application.Name, service.Name, response.ResponseTime/1e6)
// TODO
case constants.ServiceTypePING:
log.Printf("[TrackerServer] PING %s/%s -> latency:%dms\n", application.Name, service.Name, response.ResponseTime/1e6)
// TODO
}
if err = s.handlers.influx.reportOrmer.Insert(models.Report{
ApplicationID: response.ApplicationId,
ServiceID: response.ServiceId,
Latency: response.ResponseTime,
Timestamp: response.ExecutedAt,
}); err != nil {
log.Println(err)
}
case pb.ServiceStatus_SERVICE_STATUS_UNREACHABLE:
log.Printf("[TrackerServer] DOWN %s/%s @ trackerID:%s -> unreachable: %s\n", application.Name, service.Name, response.TrackerId, response.Body)
default:
log.Printf("[TrackerServer] ERR %s/%s @ trackerID:%s -> err: %s\n", application.Name, service.Name, response.TrackerId, response.Body)
}
return &pb.Empty{}, nil
}
// implements pb.UnimplementedTrackerServer
func (s *trackerServerModule) Pong(ctx context.Context, message *pb.TrackingMessage) (*pb.Empty, error) {
request := message.Body.(*pb.TrackingMessage_Request).Request
trackerID := request.TrackerId
latency := time.Now().UnixNano() - request.RequestedAt
log.Printf("[TrackerServer] PING-TR trackerID:%s -> latency:%dms", trackerID, latency/1e6)
s.mu.RLock()
defer s.mu.RUnlock()
if client, ok := s.trackers[trackerID]; !ok {
return &pb.Empty{}, fmt.Errorf("unregistered trackerID %s", request.TrackerId)
} else {
client.SetStatus(time.Now().Unix(), latency)
}
return &pb.Empty{}, nil
}
func (s *trackerServerModule) PingTracker(trackerID string) (err error) {
var client TrackerClient
var ok bool
s.mu.RLock()
if client, ok = s.trackers[trackerID]; !ok {
return fmt.Errorf("unregistered trackerID %s", trackerID)
}
s.mu.RUnlock() // immediately unlock
for {
err = client.Ping()
if err != nil {
s.mu.Lock()
defer s.mu.Unlock()
delete(s.trackers, trackerID)
for i, ID := range s.trackerIDs {
if trackerID == ID {
s.trackerIDs = append(s.trackerIDs[:i], s.trackerIDs[i+1:]...)
break
}
}
if len(s.trackers) != len(s.trackerIDs) {
log.Fatalln("trackers desync")
return
}
log.Printf("[TrackerServer] trackerID:%s disconnected. connected trackers: %d\n", trackerID, len(s.trackers))
return
}
time.Sleep(constants.TrackerPingInterval)
}
}
func (s *trackerServerModule) SendTrackingRequest(request *pb.TrackingRequest) (err error) {
s.mu.Lock()
defer s.mu.Unlock()
// round-robin
if len(s.trackers) == 0 {
return errors.New("no registered trackers")
}
s.lastUsed = (s.lastUsed + 1) % len(s.trackers)
request.TrackerId = s.trackerIDs[s.lastUsed]
return s.trackers[request.TrackerId].SendTrackingRequest(request)
}
func (c *trackerClientEntity) Ping() (err error) {
return c.stream.Send(&pb.TrackingMessage{
Code: pb.MessageType_MESSAGE_TYPE_PING,
Body: &pb.TrackingMessage_Request{
Request: &pb.TrackingRequest{
TrackerId: c.id,
RequestedAt: time.Now().UnixNano(),
},
},
})
}
func (c *trackerClientEntity) SetStatus(pingTime, latency int64) {
c.lastPinged = pingTime
c.latency = latency
}
func (c *trackerClientEntity) Status() (pingTime, latency int64) {
return c.lastPinged, c.latency
}
func (c *trackerClientEntity) SendTrackingRequest(request *pb.TrackingRequest) (err error) {
return c.stream.Send(&pb.TrackingMessage{
Code: pb.MessageType_MESSAGE_TYPE_TRACKING,
Body: &pb.TrackingMessage_Request{
Request: request,
},
})
}