summary refs log tree commit diff stats
path: root/init.go
blob: b898ae889bdf2bea5001bc0717433dfeea97a64a (plain) (blame)
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
287
288
package main

import (
	"fmt"
	"html/template"
	"log"
	"os"
	"os/signal"
	"time"

	"github.com/fsnotify/fsnotify"
	"github.com/getwtxt/registry"
	"github.com/spf13/pflag"
	"github.com/spf13/viper"
	"github.com/syndtr/goleveldb/leveldb"
)

const getwtxt = "0.1"

// command line flags
var (
	flagVersion *bool = pflag.BoolP("version", "v", false, "Display version information, then exit")
	flagHelp    *bool = pflag.BoolP("help", "h", false, "")
)

// config object
var confObj = &configuration{}

// signals to close the log file
var closeLog = make(chan bool, 1)

// used to transmit database pointer after
// initialization
var dbChan = make(chan *leveldb.DB, 1)

// templates
var tmpls *template.Template

// registry index
var twtxtCache = registry.NewIndex()

// remote registry listing
var remoteRegistries = &RemoteRegistries{}

func initGetwtxt() {
	checkFlags()
	titleScreen()
	initConfig()
	initLogging()
	tmpls = initTemplates()
	initDatabase()
	watchForInterrupt()
}

func checkFlags() {
	pflag.Parse()
	if *flagVersion {
		titleScreen()
		os.Exit(0)
	}
	if *flagHelp {
		titleScreen()
		helpScreen()
		os.Exit(0)
	}
}

func initConfig() {

	viper.SetConfigName("getwtxt")
	viper.AddConfigPath(".")
	viper.AddConfigPath("/usr/local/getwtxt")
	viper.AddConfigPath("/etc")
	viper.AddConfigPath("/usr/local/etc")

	log.Printf("Loading configuration ...\n")
	if err := viper.ReadInConfig(); err != nil {
		log.Printf("Error reading config file: %v\n", err)
		log.Printf("Using defaults ...\n")
	}

	// separate thread to watch for config file changes.
	// will log event then run rebindConfig()
	viper.WatchConfig()
	viper.OnConfigChange(func(e fsnotify.Event) {
		log.Printf("Config file change detected. Reloading...\n")
		rebindConfig()
	})

	viper.SetDefault("port", 9001)
	viper.SetDefault("logFile", "getwtxt.log")
	viper.SetDefault("databasePath", "getwtxt.db")
	viper.SetDefault("stdoutLogging", false)
	viper.SetDefault("reCacheInterval", "1h")
	viper.SetDefault("databasePushInterval", "5m")

	updateInterval := viper.GetString("reCacheInterval")
	dur, err := time.ParseDuration(updateInterval)
	if err != nil {
		log.Printf("Unable to parse registry cache update interval. Defaulting to hourly. Msg: %v\n", err)
		dur, _ = time.ParseDuration("1h")
	}

	dbPushInterval := viper.GetString("databasePushInterval")
	dbDur, err := time.ParseDuration(dbPushInterval)
	if err != nil {
		log.Printf("Unable to parse database push interval. Defaulting to every five minutes. Msg: %v\n", err)
		dbDur, _ = time.ParseDuration("5m")
	}

	thetime := time.Now()

	confObj.mu.Lock()
	confObj.port = viper.GetInt("port")
	confObj.logFile = viper.GetString("logFile")
	confObj.dbPath = viper.GetString("databasePath")
	confObj.stdoutLogging = viper.GetBool("stdoutLogging")
	confObj.cacheInterval = dur
	confObj.dbInterval = dbDur
	confObj.lastCache = thetime
	confObj.lastPush = thetime
	confObj.version = getwtxt
	confObj.Instance.Name = viper.GetString("instance.name")
	confObj.Instance.URL = viper.GetString("instance.url")
	confObj.Instance.Owner = viper.GetString("instance.owner")
	confObj.Instance.Mail = viper.GetString("instance.mail")
	confObj.Instance.Desc = viper.GetString("instance.description")
	confObj.mu.Unlock()
}

func initLogging() {

	// only open a log file if it's necessary
	confObj.mu.RLock()

	if confObj.stdoutLogging {
		log.SetOutput(os.Stdout)

	} else {

		logfile, err := os.OpenFile(confObj.logFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0600)
		if err != nil {
			log.Printf("Could not open log file: %v\n", err)
		}

		// Listen for the signal to close the log file
		// in a separate thread. Passing it as an argument
		// to prevent race conditions when the config is
		// reloaded.
		go func(logfile *os.File) {

			<-closeLog
			log.Printf("Closing log file ...\n")

			err = logfile.Close()
			if err != nil {
				log.Printf("Couldn't close log file: %v\n", err)
			}
		}(logfile)

		log.SetOutput(logfile)
	}
	confObj.mu.RUnlock()
}

func rebindConfig() {

	// signal to close the log file then wait
	confObj.mu.RLock()
	if !confObj.stdoutLogging {
		closeLog <- true
	}
	confObj.mu.RUnlock()

	// re-parse update interval
	nter := viper.GetString("reCacheInterval")
	dur, err := time.ParseDuration(nter)
	if err != nil {
		log.Printf("Unable to parse update interval. Defaulting to once daily. Msg: %v\n", err)
		dur, _ = time.ParseDuration("1h")
	}

	// re-parse database backup interval
	dbPushInterval := viper.GetString("databasePushInterval")
	dbDur, err := time.ParseDuration(dbPushInterval)
	if err != nil {
		log.Printf("Unable to parse database push interval. Defaulting to every five minutes. Msg: %v\n", err)
		dbDur, _ = time.ParseDuration("5m")
	}

	// reassign values to the config object
	confObj.mu.Lock()
	confObj.port = viper.GetInt("port")
	confObj.logFile = viper.GetString("logFile")
	confObj.stdoutLogging = viper.GetBool("stdoutLogging")
	confObj.dbPath = viper.GetString("databasePath")
	confObj.cacheInterval = dur
	confObj.dbInterval = dbDur
	confObj.Instance.Name = viper.GetString("instance.name")
	confObj.Instance.URL = viper.GetString("instance.url")
	confObj.Instance.Owner = viper.GetString("instance.owner")
	confObj.Instance.Mail = viper.GetString("instance.mail")
	confObj.Instance.Desc = viper.GetString("instance.description")
	confObj.mu.Unlock()

	// reinitialize logging
	initLogging()
}

// Parse the HTML templates
func initTemplates() *template.Template {
	return template.Must(template.ParseFiles("assets/tmpl/index.html"))
}

// Pull DB data into cache, if available.
func initDatabase() {
	confObj.mu.RLock()
	db, err := leveldb.OpenFile(confObj.dbPath, nil)
	confObj.mu.RUnlock()
	if err != nil {
		log.Fatalf("%v\n", err)
	}

	// Send the database reference into
	// the aether.
	dbChan <- db

	pullDatabase()
	go cacheAndPush()
}

// Watch for SIGINT aka ^C
// Close the log file then exit
func watchForInterrupt() {
	c := make(chan os.Signal, 1)
	signal.Notify(c, os.Interrupt)

	go func() {
		for sigint := range c {

			log.Printf("\n\nCaught %v. Cleaning up ...\n", sigint)
			confObj.mu.RLock()

			// Close the database cleanly
			log.Printf("Closing database connection to %v...\n", confObj.dbPath)
			db := <-dbChan
			if err := db.Close(); err != nil {
				log.Printf("%v\n", err)
			}

			if !confObj.stdoutLogging {
				// signal to close the log file
				closeLog <- true
			}

			confObj.mu.RUnlock()
			close(dbChan)
			close(closeLog)

			// Let everything catch up
			time.Sleep(100 * time.Millisecond)
			os.Exit(0)
		}
	}()
}

func titleScreen() {
	fmt.Printf(`
	
            _            _        _
  __ _  ___| |___      _| |___  _| |_
 / _  |/ _ \ __\ \ /\ / / __\ \/ / __|
| (_| |  __/ |_ \ V  V /| |_ >  <| |_
 \__, |\___|\__| \_/\_/  \__/_/\_\\__|
 |___/
             version ` + getwtxt + `
      github.com/getwtxt/getwtxt
               GPL  v3	
`)
}

func helpScreen() {
	fmt.Printf(`
              Help File

  Sections:
`)
}