summary refs log tree commit diff stats
path: root/svc/conf.go
blob: 90cac6a69553d7d31fd31708d930486f5fcdb698 (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
package svc // import "github.com/getwtxt/getwtxt/svc"

import (
	"log"
	"os"
	"path/filepath"
	"strings"
	"sync"
	"time"

	"github.com/spf13/viper"
)

// Configuration values are held in an instance of
// this struct.
type Configuration struct {
	Mu            sync.RWMutex
	Port          int           `yaml:"ListenPort"`
	LogFile       string        `yaml:"LogFile"`
	DBType        string        `yaml:"DatabaseType"`
	DBPath        string        `yaml:"DatabasePath"`
	AssetsDir     string        `yaml:"-"`
	StdoutLogging bool          `yaml:"StdoutLogging"`
	CacheInterval time.Duration `yaml:"StatusFetchInterval"`
	DBInterval    time.Duration `yaml:"DatabasePushInterval"`
	Instance      `yaml:"Instance"`
}

// Instance refers to meta data about
// this specific instance of getwtxt
type Instance struct {
	Vers  string `yaml:"-"`
	Name  string `yaml:"Instance.SiteName"`
	URL   string `yaml:"Instance.URL"`
	Owner string `yaml:"Instance.OwnerName"`
	Mail  string `yaml:"Instance.Email"`
	Desc  string `yaml:"Instance.Description"`
}

// Called on start-up. Initializes everything
// related to configuration values.
func initConfig() {
	log.Printf("Loading configuration ...\n")

	parseConfigFlag()
	setConfigDefaults()

	if err := viper.ReadInConfig(); err != nil {
		log.Printf("%v\n", err.Error())
		log.Printf("Using defaults ...\n")
		bindConfig()
		return
	}

	viper.WatchConfig()
	viper.OnConfigChange(reInit)
	bindConfig()
}

// Registers either stdout or a specified file
// to the default logger.
func initLogging() {

	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)
		errLog("Could not open log file: ", 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\n")
			errLog("Could not close log file: ", logfile.Close())
		}(logfile)

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

// Default values should a config file
// not be available.
func setConfigDefaults() {
	viper.SetDefault("ListenPort", 9001)
	viper.SetDefault("LogFile", "getwtxt.log")
	viper.SetDefault("DatabasePath", "getwtxt.db")
	viper.SetDefault("AssetsDirectory", "assets")
	viper.SetDefault("DatabaseType", "leveldb")
	viper.SetDefault("StdoutLogging", false)
	viper.SetDefault("ReCacheInterval", "1h")
	viper.SetDefault("DatabasePushInterval", "5m")

	viper.SetDefault("Instance.SiteName", "getwtxt")
	viper.SetDefault("Instance.OwnerName", "Anonymous Microblogger")
	viper.SetDefault("Instance.Email", "nobody@knows")
	viper.SetDefault("Instance.URL", "https://twtxt.example.com")
	viper.SetDefault("Instance.Description", "A fast, resilient twtxt registry server written in Go!")
}

// Reads data from the configuration
// flag and acts accordingly.
func parseConfigFlag() {
	if *flagConfFile == "" {
		viper.SetConfigName("getwtxt")
		viper.SetConfigType("yml")
		viper.AddConfigPath(".")
		viper.AddConfigPath("/usr/local/getwtxt")
		viper.AddConfigPath("/etc")
		viper.AddConfigPath("/usr/local/etc")

	} else {
		path, file := filepath.Split(*flagConfFile)
		if path == "" {
			path = "."
		}
		filename := strings.Split(file, ".")
		viper.SetConfigName(filename[0])
		viper.SetConfigType(filename[1])
		viper.AddConfigPath(path)
	}
}

// Simply goes down the list of fields
// in the confObj instance of &Configuration{},
// assigning values from the config file.
func bindConfig() {
	confObj.Mu.Lock()

	confObj.Port = viper.GetInt("ListenPort")
	confObj.LogFile = viper.GetString("LogFile")
	confObj.DBType = strings.ToLower(viper.GetString("DatabaseType"))
	confObj.DBPath = viper.GetString("DatabasePath")
	confObj.AssetsDir = viper.GetString("AssetsDirectory")
	confObj.StdoutLogging = viper.GetBool("StdoutLogging")
	confObj.CacheInterval = viper.GetDuration("StatusFetchInterval")
	confObj.DBInterval = viper.GetDuration("DatabasePushInterval")

	confObj.Instance.Vers = Vers
	confObj.Instance.Name = viper.GetString("Instance.SiteName")
	confObj.Instance.URL = viper.GetString("Instance.URL")
	confObj.Instance.Owner = viper.GetString("Instance.OwnerName")
	confObj.Instance.Mail = viper.GetString("Instance.Email")
	confObj.Instance.Desc = viper.GetString("Instance.Description")

	if *flagDBType != "" {
		confObj.DBType = *flagDBType
	}
	if *flagDBPath != "" {
		confObj.DBPath = *flagDBPath
	}
	if *flagAssets != "" {
		confObj.AssetsDir = *flagAssets
	}

	if confObj.StdoutLogging {
		log.Printf("Logging to: stdout\n")
	} else {
		log.Printf("Logging to: %v\n", confObj.LogFile)
	}
	log.Printf("Using %v database: %v\n", confObj.DBType, confObj.DBPath)
	log.Printf("Database push interval: %v\n", confObj.DBInterval)
	log.Printf("User status fetch interval: %v\n", confObj.CacheInterval)

	confObj.Mu.Unlock()
}