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