vendor/github.com/fsouza/go-dockerclient/external/github.com/Sirupsen/logrus/hooks.go

   1 package logrus
   2
   3 // A hook to be fired when logging on the logging levels returned from
   4 // `Levels()` on your implementation of the interface. Note that this is not
   5 // fired in a goroutine or a channel with workers, you should handle such
   6 // functionality yourself if your call is non-blocking and you don't wish for
   7 // the logging calls for levels returned from `Levels()` to block.
   8 type Hook interface {
   9         Levels() []Level
  10         Fire(*Entry) error
  11 }
  12
  13 // Internal type for storing the hooks on a logger instance.
  14 type LevelHooks map[Level][]Hook
  15
  16 // Add a hook to an instance of logger. This is called with
  17 // `log.Hooks.Add(new(MyHook))` where `MyHook` implements the `Hook` interface.
  18 func (hooks LevelHooks) Add(hook Hook) {
  19         for _, level := range hook.Levels() {
  20                 hooks[level] = append(hooks[level], hook)
  21         }
  22 }
  23
  24 // Fire all the hooks for the passed level. Used by `entry.log` to fire
  25 // appropriate hooks for a log entry.
  26 func (hooks LevelHooks) Fire(level Level, entry *Entry) error {
  27         for _, hook := range hooks[level] {
  28                 if err := hook.Fire(entry); err != nil {
  29                         return err
  30                 }
  31         }
  32
  33         return nil
  34 }