-
Notifications
You must be signed in to change notification settings - Fork 1
/
alerts.go
259 lines (226 loc) · 6.06 KB
/
alerts.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
package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"os"
"path"
"strings"
"sync"
"time"
)
// AlertGood and AlertBad maps Nosee AlertMessageType
const (
AlertGood string = "GOOD"
AlertBad string = "BAD"
)
const statusFile string = "nosee-console-alerts.json"
// Alert follows Nosee's idea of an alert message
type Alert struct {
Type string
Subject string
NoseeSrv string
Hostname string
Classes []string
UniqueID string
BadTime time.Time
GoodTime time.Time
BadDetails string
GoodDetails string
}
// currentAlerts is a "thread-safe" map of all alerts
// Map key is the UniqueID
var (
currentAlerts map[string]*Alert
currentAlertsMutex sync.Mutex
)
func currentAlertsSave() {
// doing this in a go routine allows this function to be called
// by functions that are already locking the mutex
go func() {
currentAlertsMutex.Lock()
defer currentAlertsMutex.Unlock()
f, err := os.Create(path.Clean(*savePath + "/" + statusFile))
if err != nil {
log.Fatalf("can't save status, %s", err)
}
defer f.Close()
enc := json.NewEncoder(f)
err = enc.Encode(¤tAlerts)
if err != nil {
log.Fatalf("status json encode: %s", err)
}
log.Printf("status saved")
}()
}
func currentAlertsLoad() {
currentAlertsMutex.Lock()
defer currentAlertsMutex.Unlock()
f, err := os.Open(path.Clean(*savePath + "/" + statusFile))
if err != nil {
log.Printf("can't read previous status: %s, no alert loaded", err)
return
}
defer f.Close()
dec := json.NewDecoder(f)
err = dec.Decode(¤tAlerts)
if err != nil {
log.Fatalf("status json decode: %s", err)
}
log.Printf("status loaded: %d alert(s)", len(currentAlerts))
}
func currentAlertsPurge(hub *Hub, expireHours int) {
currentAlertsMutex.Lock()
defer currentAlertsMutex.Unlock()
for hash, alert := range currentAlerts {
if alert.Type == AlertBad {
continue
}
since := time.Since(alert.GoodTime)
if since > time.Duration(expireHours)*time.Hour {
delete(currentAlerts, hash)
currentAlertsSave()
hub.Broadcast("purged")
log.Printf("deleting old alert (%s)", alert.Subject)
}
}
}
func currentAlertsPurger(hub *Hub, expireHours int) {
for {
currentAlertsPurge(hub, expireHours)
time.Sleep(30 * time.Second)
}
}
func currentAlertsCreate() {
currentAlerts = make(map[string]*Alert)
}
// should notify the WS…
// func currentAlertsDelete(hash string) {
// currentAlertsMutex.Lock()
// defer currentAlertsMutex.Unlock()
// delete(currentAlerts, hash)
// }
func currentAlertsAdd(hash string, alert *Alert) error {
currentAlertsMutex.Lock()
defer currentAlertsMutex.Unlock()
if _, exists := currentAlerts[hash]; exists == true {
return fmt.Errorf("hash for this alert already exists (%s)", hash)
}
currentAlerts[hash] = alert
currentAlertsSave()
return nil
}
func currentAlertsExists(hash string) bool {
currentAlertsMutex.Lock()
defer currentAlertsMutex.Unlock()
_, exists := currentAlerts[hash]
return exists
}
func currentAlertsUpdate(hash string, alert *Alert) error {
if currentAlertsExists(hash) == false {
return fmt.Errorf("can't update a non-existing alert (%s)", hash)
}
currentAlertsMutex.Lock()
defer currentAlertsMutex.Unlock()
if currentAlerts[hash].Type == AlertGood {
return fmt.Errorf("alert is already good, can't update (%s)", hash)
}
badTime := currentAlerts[hash].BadTime
badDetails := currentAlerts[hash].BadDetails
currentAlerts[hash] = alert
currentAlerts[hash].BadTime = badTime
currentAlerts[hash].BadDetails = badDetails
currentAlertsSave()
return nil
}
func serveAlerts(hub *Hub, w http.ResponseWriter, r *http.Request) {
// GET -> return collection
// POST -> add new message to collection or
// update a message from BAD to GOOD
switch r.Method {
case "GET":
w.Header().Set("Content-Type", "application/json")
currentAlertsMutex.Lock()
defer currentAlertsMutex.Unlock()
json.NewEncoder(w).Encode(currentAlerts)
case "POST":
subject := r.PostFormValue("subject")
typeMsg := r.PostFormValue("type")
classesStr := r.PostFormValue("classes")
hostname := r.PostFormValue("hostname")
noseeSrv := r.PostFormValue("nosee_srv")
uniqueid := r.PostFormValue("uniqueid")
datetimeStr := r.PostFormValue("datetime")
details := r.PostFormValue("details")
if subject == "" {
http.Error(w, "Invalid request: empty subject", 400)
return
}
if details == "" {
http.Error(w, "Invalid request: empty details", 400)
return
}
if typeMsg != AlertGood && typeMsg != AlertBad {
http.Error(w, "Invalid request: type empty or unknown: '"+typeMsg+"'", 400)
return
}
if classesStr == "" {
http.Error(w, "Invalid request: empty classes", 400)
return
}
if hostname == "" {
http.Error(w, "Invalid request: empty hostname", 400)
return
}
if noseeSrv == "" {
http.Error(w, "Invalid request: empty nosee_srv", 400)
return
}
if uniqueid == "" {
http.Error(w, "Invalid request: empty uniqueid", 400)
return
}
datetime, errorDatetime := time.Parse(time.RFC3339, datetimeStr)
if errorDatetime != nil {
http.Error(w, "Invalid request: can't parse datetime: "+errorDatetime.Error(), 400)
return
}
classes := strings.Split(classesStr, ",")
alert := Alert{
Type: typeMsg,
Subject: subject,
NoseeSrv: noseeSrv,
Hostname: hostname,
Classes: classes,
UniqueID: uniqueid,
}
if typeMsg == "GOOD" {
alert.GoodTime = datetime
alert.GoodDetails = details
if currentAlertsExists(uniqueid) {
// will preserve previous BadTime
if error := currentAlertsUpdate(uniqueid, &alert); error != nil {
log.Println(error)
http.Error(w, error.Error(), 400)
return
}
fmt.Fprintf(w, "updated\n")
hub.Broadcast("fixed")
return
}
// we don't have the corresponding "BAD", let's create it
}
alert.BadDetails = details
alert.BadTime = datetime
if error := currentAlertsAdd(uniqueid, &alert); error != nil {
log.Println(error)
http.Error(w, error.Error(), 400)
return
}
fmt.Fprintf(w, "created\n")
hub.Broadcast("created")
default:
http.Error(w, "Invalid request method.", 405)
}
}