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config.go
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config.go
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package config
import (
"errors"
"log"
"os"
"path/filepath"
"sync"
"github.com/fsnotify/fsnotify"
"github.com/spf13/viper"
)
var (
// conf conf var
conf *Config
// conf file type
FileTypeYaml = "yaml"
FileTypeJson = "json"
FileTypeToml = "toml"
)
// Config conf struct.
type Config struct {
env string
configDir string
configType string // file type, eg: yaml, json, toml, default is yaml
val map[string]*viper.Viper
mu sync.Mutex
}
// New create a config instance.
func New(cfgDir string, opts ...Option) *Config {
// must set config dir
if cfgDir == "" {
panic("config dir is not set")
}
c := Config{
configDir: cfgDir,
configType: FileTypeYaml,
val: make(map[string]*viper.Viper),
}
for _, opt := range opts {
opt(&c)
}
conf = &c
return &c
}
// Load alias for config func.
func Load(filename string, val interface{}) error { return conf.Load(filename, val) }
// Load scan data to struct.
func (c *Config) Load(filename string, val interface{}) error {
v, err := c.LoadWithType(filename, c.configType)
if err != nil {
return err
}
err = v.Unmarshal(&val)
if err != nil {
return err
}
return nil
}
// LoadYaml alias for config func.
func LoadYaml(filename string, val interface{}) error { return conf.LoadYaml(filename, val) }
// LoadYaml scan data to struct.
func (c *Config) LoadYaml(filename string, val interface{}) error {
v, err := c.LoadWithType(filename, FileTypeYaml)
if err != nil {
return err
}
err = v.Unmarshal(&val)
if err != nil {
return err
}
return nil
}
// LoadJson alias for config func.
func LoadJson(filename string, val interface{}) error { return conf.LoadJson(filename, val) }
// LoadJson scan data to struct.
func (c *Config) LoadJson(filename string, val interface{}) error {
v, err := c.LoadWithType(filename, FileTypeJson)
if err != nil {
return err
}
err = v.Unmarshal(&val)
if err != nil {
return err
}
return nil
}
// LoadToml alias for config func.
func LoadToml(filename string, val interface{}) error { return conf.LoadToml(filename, val) }
// LoadToml scan data to struct.
func (c *Config) LoadToml(filename string, val interface{}) error {
v, err := c.LoadWithType(filename, FileTypeToml)
if err != nil {
return err
}
err = v.Unmarshal(&val)
if err != nil {
return err
}
return nil
}
// LoadWithType load conf by file type.
func LoadWithType(filename string, cfgType string) (*viper.Viper, error) {
return conf.LoadWithType(filename, cfgType)
}
// LoadWithType load conf by file type.
func (c *Config) LoadWithType(filename string, cfgType string) (v *viper.Viper, err error) {
c.mu.Lock()
defer c.mu.Unlock()
v, ok := c.val[filename]
if ok {
return v, nil
}
v, err = c.load(filename, cfgType)
if err != nil {
return nil, err
}
c.val[filename] = v
return v, nil
}
// Load load file.
func (c *Config) load(filename string, cfgType string) (*viper.Viper, error) {
// application parameters take precedence over environment variables
env := GetEnvString("APP_ENV", "")
path := filepath.Join(c.configDir, env)
if c.env != "" {
path = filepath.Join(c.configDir, c.env)
}
v := viper.New()
v.AddConfigPath(path)
v.SetConfigName(filename)
v.SetConfigType(c.configType)
if cfgType != "" {
v.SetConfigType(cfgType)
}
if err := v.ReadInConfig(); err != nil {
if _, ok := err.(viper.ConfigFileNotFoundError); ok {
return nil, errors.New("config file not found")
}
return nil, err
}
v.WatchConfig()
v.OnConfigChange(func(e fsnotify.Event) {
log.Printf("Config file changed: %s", e.Name)
})
return v, nil
}
// GetEnvString get value from env.
func GetEnvString(key string, defaultValue string) string {
val, ok := os.LookupEnv(key)
if !ok {
return defaultValue
}
return val
}