-
Notifications
You must be signed in to change notification settings - Fork 1
/
app.go
228 lines (185 loc) · 5.98 KB
/
app.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
package v1
import (
"context"
"fmt"
"os"
"sync"
tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
"github.com/psyb0t/glogger"
"github.com/psyb0t/telegram-logger/internal/pkg/storage"
"github.com/psyb0t/telegram-logger/internal/pkg/storage/badgerdb"
"github.com/valyala/fasthttp"
)
// app contains the context, cancel function, config, HTTP server,
// Telegram bot API, and database connection for the app.
type app struct {
ctx context.Context //nolint:containedctx
cancelFunc context.CancelFunc
config config
httpServer fasthttp.Server
telegramBotAPI *tgbotapi.BotAPI
db storage.Storage
}
// newApp creates a new app struct and initializes the Telegram
// bot connection and database. It also sets up the HTTP server.
func newApp(parentCtx context.Context, cfg config) (*app, error) {
log := glogger.New(glogger.Caller{
Service: os.Getenv(serviceNameEnvVarName),
Package: packageName,
Function: "newApp",
})
ctx, cancelFunc := context.WithCancel(parentCtx)
a := &app{
ctx: ctx,
cancelFunc: cancelFunc,
config: cfg,
}
log.Info("setting up the telegram bot connection")
var err error
a.telegramBotAPI, err = tgbotapi.NewBotAPI(cfg.TelegramBot.Token)
if err != nil {
log.Err(err).Error("an error occurred when setting up the telegram bot connection")
return nil, err
}
// a.telegramBotAPI.Debug = true
log.Debug(fmt.Sprintf("Authorized on telegram account %s", a.telegramBotAPI.Self.UserName))
log.Info("setting up the database")
if err := a.setupDatabase(); err != nil {
log.Err(err).Error("an error occurred when setting up the database")
return nil, err
}
log.Info("setting up HTTP server")
a.httpServer = fasthttp.Server{
Handler: a.getHTTPRequestHandler(),
GetOnly: false,
NoDefaultServerHeader: true,
NoDefaultDate: true,
MaxRequestBodySize: 1 * 1024 * 1024, // 1mb
ReadBufferSize: 1024 * 1024, // 1mb
}
return a, nil
}
// sets up the database connection for the app based on the specified
// storage type in the config.
func (a *app) setupDatabase() error {
var err error
switch a.config.Storage.Type {
case storageTypeBadgerDB:
a.db, err = badgerdb.New(a.ctx)
default:
return ErrUnsupportedStorageType
}
return err
}
// start starts the app by opening the database connection and starting the
// HTTP server and Telegram bot message handler in separate goroutines.
// It waits for either the context to be cancelled or for one of the goroutines
// to return an error. If the context is cancelled, it sets the error to the
// context's error. If one of the goroutines returns an error, it sets the
// error to that error. It then stops the app and returns the error.
func (a *app) start() error {
log := glogger.New(glogger.Caller{
Service: os.Getenv(serviceNameEnvVarName),
Package: packageName,
Receiver: "app",
Function: "start",
})
log.Info("opening the database connection")
if err := a.db.Open(a.config.Storage.BadgerDB.DSN); err != nil {
log.Err(err).Error(ErrUnableToOpenDatabaseConnection.Error())
return ErrUnableToOpenDatabaseConnection
}
var wg sync.WaitGroup
httpServerErrCh := make(chan error, 1)
wg.Add(1)
go a.startHTTPServer(&wg, httpServerErrCh)
telegramBotMessageHandlerErrCh := make(chan error, 1)
wg.Add(1)
go a.startTelegramBotMessageHandler(&wg, telegramBotMessageHandlerErrCh)
var err error
select {
case <-a.ctx.Done():
log.Info("context is done")
err = a.ctx.Err()
case err = <-httpServerErrCh:
if err != nil {
log.Err(err).Error("HTTP server encountered an error")
}
case err = <-telegramBotMessageHandlerErrCh:
if err != nil {
log.Err(err).Error("Telegram bot message handler encountered an error")
}
}
a.cancelFunc()
a.cleanup()
log.Debug("waiting for wait group to de done")
wg.Wait()
return err
}
// startHTTPServer starts the HTTP server and waits for it to stop. If the
// server returns an error, it is passed on to the calling function via
// the provided error channel.
func (a *app) startHTTPServer(wg *sync.WaitGroup, errCh chan<- error) {
defer wg.Done()
defer close(errCh)
log := glogger.New(glogger.Caller{
Service: os.Getenv(serviceNameEnvVarName),
Package: packageName,
Receiver: "app",
Function: "startHTTPServer",
})
log.Info("Starting HTTP server on " + a.config.ListenAddress)
defer log.Info("HTTP server stopped")
errCh <- a.httpServer.ListenAndServe(a.config.ListenAddress)
}
// startTelegramBotMessageHandler starts the Telegram bot message handler
// and waits for it to stop. If the message handler returns an error, it is
// passed on to the calling function via the provided error channel.
func (a *app) startTelegramBotMessageHandler(wg *sync.WaitGroup, errCh chan<- error) {
defer wg.Done()
defer close(errCh)
log := glogger.New(glogger.Caller{
Service: os.Getenv(serviceNameEnvVarName),
Package: packageName,
Receiver: "app",
Function: "startHTTPServer",
})
log.Info("starting the Telegram bot message handler")
defer log.Info("Telegram bot message handler stopped")
errCh <- a.telegramBotMessageHandler()
}
func (a *app) stop() {
log := glogger.New(glogger.Caller{
Service: os.Getenv(serviceNameEnvVarName),
Package: packageName,
Receiver: "app",
Function: "stop",
})
log.Info("cancelling app context")
a.cancelFunc()
}
/*
func (a *app) healthCheck() error {
return nil
}
*/
// cleanup gracefully shuts down the HTTP server and closes the
// database connection.
func (a *app) cleanup() {
log := glogger.New(glogger.Caller{
Service: os.Getenv(serviceNameEnvVarName),
Package: packageName,
Receiver: "app",
Function: "cleanup",
})
log.Info("cleanup started")
defer log.Info("cleanup complete")
log.Info("gracefully shutting down the HTTP sever")
if err := a.httpServer.Shutdown(); err != nil {
log.Err(err).Error("HTTP server graceful shutdown failed")
}
log.Info("closing the database connection")
if err := a.db.Close(); err != nil {
log.Err(err).Error("error when closing the database connection")
}
}