new method of working with config
This commit is contained in:
186
internal/initialize/initialize.go
Normal file
186
internal/initialize/initialize.go
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@@ -0,0 +1,186 @@
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package initialize
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import (
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"flag"
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"log"
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"os"
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"reflect"
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"strconv"
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"mutating-webhook/internal/config"
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"mutating-webhook/internal/envconfig"
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)
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// getEnvString returns string from environment variable
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func getEnvString(env, def string) (val string) { //nolint:deadcode
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val = os.Getenv(env)
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if val == "" {
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return def
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}
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return
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}
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// getEnvInt returns int from environment variable
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func getEnvInt(env string, def int) (ret int) {
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val := os.Getenv(env)
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if val == "" {
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return def
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}
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ret, err := strconv.Atoi(val)
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if err != nil {
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log.Fatalf("[ERROR] Environment variable is not numeric: %v\n", env)
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}
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return
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}
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// getEnvBool returns boolean from environment variable
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func getEnvBool(env string, def bool) bool {
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var (
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err error
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retVal bool
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val = os.Getenv(env)
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)
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if len(val) == 0 {
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return def
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} else {
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retVal, err = strconv.ParseBool(val)
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if err != nil {
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log.Fatalf("[ERROR] Environment variable is not boolean: %v\n", env)
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}
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}
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return retVal
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}
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/*
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func setLogLevel(l int) {
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switch {
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case l <= 20:
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config.Log.SetMinLevel(logutils.LogLevel("ERROR"))
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case l > 20 && l <= 40:
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config.Log.SetMinLevel(logutils.LogLevel("WARNING"))
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case l > 40 && l <= 60:
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config.Log.SetMinLevel(logutils.LogLevel("INFO"))
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case l > 60 && l <= 80:
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config.Log.SetMinLevel(logutils.LogLevel("DEBUG"))
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case l > 80:
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config.Log.SetMinLevel(logutils.LogLevel("TRACE"))
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}
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}
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*/
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func Init() {
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/*
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var (
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tz string
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err error
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)
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*/
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cfg, err := config.NewConfig()
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if err != nil {
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log.Fatalf("[FATAL] Unable to initialize.")
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}
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cfgInfo, err := envconfig.GetStructInfo(cfg)
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if err != nil {
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log.Fatalf("[FATAL] %v", err)
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}
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for _, info := range cfgInfo {
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switch info.Type.String() {
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case "string":
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var dv string
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if info.DefaultValue != nil {
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dv = info.DefaultValue.(string)
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}
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p := reflect.ValueOf(cfg).Elem().FieldByName(info.Name).Addr().Interface().(*string)
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flag.StringVar(p, info.Name, getEnvString(info.Name, dv), "("+info.Key+")")
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case "bool":
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var dv bool
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if info.DefaultValue != nil {
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dv = info.DefaultValue.(bool)
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}
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p := reflect.ValueOf(cfg).Elem().FieldByName(info.Name).Addr().Interface().(*bool)
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flag.BoolVar(p, info.Name, getEnvBool(info.Name, dv), "("+info.Key+")")
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case "int":
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var dv int
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if info.DefaultValue != nil {
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dv = int(info.DefaultValue.(int64))
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}
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p := reflect.ValueOf(cfg).Elem().FieldByName(info.Name).Addr().Interface().(*int)
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flag.IntVar(p, info.Name, getEnvInt(info.Name, dv), "("+info.Key+")")
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}
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}
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flag.Parse()
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if err = cfg.Validate(); err != nil {
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log.Fatalf("[FATAL] %v", err)
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}
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/*
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// log configuration
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flag.IntVar(&config.LogLevel,
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"log",
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getEnvInt("LOG_LEVEL", 50),
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"(LOG_LEVEL)\nlog level")
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// local webserver configuration
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flag.IntVar(&config.WebSrvPort,
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"http-port",
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getEnvInt("HTTP_PORT", 8080),
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"(HTTP_PORT)\nlisten port for internal webserver")
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flag.StringVar(&config.WebSrvIP,
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"http-ip",
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getEnvString("HTTP_IP", ""),
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"(HTTP_IP)\nlisten ip for internal webserver")
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flag.IntVar(&config.WebSrvReadTimeout,
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"http-read-timeout",
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getEnvInt("HTTP_READ_TIMEOUT", 5),
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"(HTTP_READ_TIMEOUT)\ninternal http server read timeout in seconds")
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flag.IntVar(&config.WebSrvWriteTimeout,
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"http-write-timeout",
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getEnvInt("HTTP_WRITE_TIMEOUT", 2),
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"(HTTP_WRITE_TIMEOUT\ninternal http server write timeout in seconds")
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flag.IntVar(&config.WebSrvIdleTimeout,
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"http-idle-timeout",
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getEnvInt("HTTP_IDLE_TIMEOUT", 2),
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"(HTTP_IDLE_TIMEOUT)\ninternal http server idle timeout in seconds")
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// timezone
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flag.StringVar(&tz,
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"timezone",
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getEnvString("TZ", "America/Chicago"),
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"(TZ)\ntimezone")
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// read command line options
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flag.Parse()
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// logging level
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setLogLevel(config.LogLevel)
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log.SetOutput(config.Log)
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// timezone configuration
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config.TimeZoneUTC, _ = time.LoadLocation("UTC")
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if config.TimeZoneLocal, err = time.LoadLocation(tz); err != nil {
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log.Fatalf("[ERROR] Unable to parse timezone string. Please use one of the timezone database values listed here: %s", "https://en.wikipedia.org/wiki/List_of_tz_database_time_zones")
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}
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// print current configuration
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log.Printf("[DEBUG] configuration value set: LOG_LEVEL = %s\n", strconv.Itoa(config.LogLevel))
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log.Printf("[DEBUG] configuration value set: HTTP_PORT = %s\n", strconv.Itoa(config.WebSrvPort))
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log.Printf("[DEBUG] configuration value set: HTTP_IP = %s\n", config.WebSrvIP)
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log.Printf("[DEBUG] configuration value set: HTTP_READ_TIMEOUT = %s\n", strconv.Itoa(config.WebSrvReadTimeout))
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log.Printf("[DEBUG] configuration value set: HTTP_WRITE_TIMEOUT = %s\n", strconv.Itoa(config.WebSrvWriteTimeout))
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log.Printf("[DEBUG] configuration value set: HTTP_IDLE_TIMEOUT = %s\n", strconv.Itoa(config.WebSrvIdleTimeout))
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log.Printf("[DEBUG] configuration value set: TZ = %s\n", tz)
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log.Println("[INFO] initialization complete")
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*/
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}
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