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config.go
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config.go
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package config
import (
"io/ioutil"
"log"
"os"
"gopkg.in/yaml.v3"
)
type Server struct {
PORT string `yaml:"port"`
DebugLogs bool `yaml:"debugLogs"`
}
type Config struct {
Environment string
Server Server
}
func (c *Config) defaults() *Config {
config := &Config{
Environment: "Debug",
Server: Server{
PORT: "8989",
DebugLogs: false,
},
}
return config
}
func (c *Config) load() (*Config, error) {
//Config file exist. Load the config.
log.Println("Config file exists....Loading")
f, err := ioutil.ReadFile("config.yml")
if err != nil {
log.Fatalf("ERROR: Cannot read config file - %v", err)
return nil, err
}
err = yaml.Unmarshal([]byte(f), &c)
if err != nil {
log.Fatalf("ERROR: Configuration Error: %v", err)
return nil, err
}
return c, nil
}
func InitConfig() (*Config, error) {
var c *Config
if _, err := os.Stat("config.yml"); err != nil {
//If config file does not exists.
config := c.defaults()
con, err := yaml.Marshal(&config)
if err != nil {
log.Fatalf("Error while parsing the config file: %v", err)
return nil, err
}
f, err := os.Create("config.yml")
if err != nil {
log.Fatalf("Error while creating the config file: %v", err)
return nil, err
}
defer f.Close()
d := []byte(string(con))
w, err := f.Write(d)
if err != nil {
log.Fatalf("Error while writing to config file: %v", err)
return nil, err
}
log.Printf("Config saved successfully - %d bytes written", w)
c, err = c.load()
if err != nil {
log.Fatalf("ERROR: Cannot load configuration: %v", err)
}
} else if os.IsNotExist(err) {
log.Fatalf("ERROR: File not found - %v", err)
return nil, err
} else {
c, err = c.load()
if err != nil {
log.Fatalf("ERROR: Cannot load configurations: %v", err)
}
}
return c, nil
}