errorhelpers/errorhelpers.go

package errorhelpers

import (
  "fmt"
  "errors"
  "git.mmnx.de/Moe/templatehelpers"
  "github.com/kataras/iris"
)

const (
  // Error levels
  ERR_NO_ERR = -1
  ERR_LVL_INFORMATION = 0
  ERR_LVL_WARNING = 1
  ERR_LVL_ERROR = 2
  ERR_LVL_FATAL = 3
  // User errors
  ERR_USER_NOT_FOUND = "ERR_USER_NOT_FOUND"
  ERR_PASSWORD_MISMATCH = "ERR_PASSWORD_MISMATCH"
  ERR_SESSION_TIMED_OUT = "ERR_SESSION_TIMED_OUT"
  ERR_INVALID_TOKEN = "ERR_INVALID_TOKEN"
  ERR_USERNAME_TAKEN = "ERR_USERNAME_TAKEN"
  ERR_INVALID_PARAM = "ERR_INVALID_PARAM"
  ERR_NO_CHANGES = "ERR_NO_CHANGES"
  SUCCESS_LOGIN = "SUCCESS_LOGIN"
  SUCCESS_LOGOUT = "SUCCESS_LOGOUT"
  SUCCESS_UPDATE = "SUCCESS_UPDATE"
  SUCCESS_REGISTER = "SUCCESS_REGISTER"
  SUCCESS_TOKENS_GENERATED = "SUCCESS_TOKENS_GENERATED"
)

type Error struct {
  err error
  errLvl int
}

func(err Error) getErrLvl() int {
  return err.errLvl
}

func(err Error) getError() error {
  return err.err
}

func MakeError(e interface{}) Error {
  if e == nil { // check if it's an error
    return Error{nil, ERR_NO_ERR}
  }

  var err error
  var logLvl int
  // test for input type
  if v, isError := e.(error); isError {
    err = v
  } else if v, isString := e.(string); isString {
    err = errors.New(v)
  } else {
    fmt.Printf("Error Type not implemented: %T", e)
    DebugVar(e)
    DebugVar(&e)
  }

  switch err.Error() { // TODO: starts with ?
  case SUCCESS_LOGIN, SUCCESS_LOGOUT, SUCCESS_TOKENS_GENERATED, SUCCESS_UPDATE, SUCCESS_REGISTER:
      logLvl = ERR_LVL_INFORMATION
    default:
      logLvl = ERR_LVL_ERROR
  }

  return Error{err, logLvl}
}

func DebugVar(v interface{}) {
  fmt.Printf("%#v\n", v)
}

func HandleError(e interface{}, ctx *iris.Context) {
  err := MakeError(e)
  params := ctx.Get("params").(map[string]string)

  if err.getError() == nil { // if no error ..., TODO clean this up
    if len(params["notification"]) < 1 { // if we got one, show a notification
      ctx.Next() // ... execute next middleware
      return
    } else {
      err = MakeError(params["notification"]) // copy so that we dont get a nil pointer later
    }
  }

  params["notification"] = err.getError().Error() // TODO human readable
  params["notificationType"] = fmt.Sprintf("%d", err.getErrLvl())

  /** Some errors need to be 'redirected' **/

  switch err.getError().Error() {
    case SUCCESS_LOGIN: // open home after login
      params["reqDir"] = "home"
    case SUCCESS_LOGOUT, ERR_SESSION_TIMED_OUT, ERR_INVALID_TOKEN:
      params["reqDir"] = "login"

  }
  ctx.Set("params", params)

  switch err.getErrLvl() {
    case ERR_LVL_INFORMATION:
      templatehelpers.ShowNotification(ctx) // TODO: information custom color
    case ERR_LVL_WARNING:
      templatehelpers.ShowError(ctx)
    case ERR_LVL_ERROR:
      templatehelpers.ShowError(ctx)
    default:
      fmt.Print("Not implemented yet: ")
      ctx.StopExecution()
      DebugVar(err)
  }
}