Handlers

Implement the Handler interface for custom output formats:

type Handler interface {
  Log(Entry)
}

The Entry struct provides Level, Time, Message, Symbol, Indent, Tree, and Fields. The logger handles level filtering, field accumulation, timestamps, and locking - the handler only formats and writes.

// Using HandlerFunc adapter
clog.SetHandler(clog.HandlerFunc(func(e clog.Entry) {
  data, _ := json.Marshal(e)
  fmt.Println(string(data))
}))

Example output:

{"level":"info","symbol":"ℹ️","message":"Server started","fields":[{"key":"port","value":"8080"}]}

Level serializes as a human-readable string (e.g. "info", "error"). Time is omitted when timestamps are disabled. Symbol, Indent, Tree, and Fields are omitted when empty/zero.