Log creation

Every time a new log is created, it's necessary to alloc a new map to represent it's fields. This new map will be filled with the Logger Base fields, PreHooks, AdHoc fields and PostHooks (The order in which the fields are applied is discussed at Fields override order). This process can be expensive, depending on the Logger size.

caution

The final LogFields will be an entire new map. You can, of course, change the value of some of it's keys directly inside the Output functions, but it's not recommended. The LogFields map is intended to be used as a read-only map.

note

The life time of these maps are very short. They're useless after the last Output function is finished.

If you need performance and your logs are heavy, you should set the Logger to be async (see Async Logger for details), and all this process will be performed into a dedicated go routine. Just remember that the PreHooks are always executed by the same go routine that created the Log.

If you want to see details about the implementation, see the Logger.Log source-code and handleLog source-code, at the root package. The entire process is done inside them.