[Proposal] Make Logger.Formatter configurable

[Stephan Epping]

Use case

I need to convert the log format that is used for `:console` to print in json format. (Because we use a docker syslog backend that forwards `stdout` to logstash). 

Preferred Solution

Ideally, I would give the `:console` backend a custom formatter via config. The custom formatter than just converts the metadata and message to a json string, which is printed by the default `console` backend. But right now the backend relies on `Logger.Formatter` exclusively. 

Alternative

Add a custom backend that in fact intercepts the log message and converts it to json and then forwards it to the `:console` backend. Drawback: one need to somehow start and wrap the `console` backend. 

[José Valim]

Please see the "Custom formatting" section in the Logger docs: https://hexdocs.pm/logger/master/Logger.html

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Director of R&D

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[Stephan Epping]

Thanks. I was looking at Elixir 1.4 though :(

On Thursday, July 13, 2017 at 10:43:40 AM UTC+2, José Valim wrote:

Please see the "Custom formatting" section in the Logger docs: https://hexdocs.pm/logger/master/Logger.html

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Director of R&D

On Thu, Jul 13, 2017 at 10:27 AM, Stephan Epping <stepha...@gmail.com> wrote:

Use case

I need to convert the log format that is used for `:console` to print in json format. (Because we use a docker syslog backend that forwards `stdout` to logstash). 

Preferred Solution

Ideally, I would give the `:console` backend a custom formatter via config. The custom formatter than just converts the metadata and message to a json string, which is printed by the default `console` backend. But right now the backend relies on `Logger.Formatter` exclusively. 

Alternative

Add a custom backend that in fact intercepts the log message and converts it to json and then forwards it to the `:console` backend. Drawback: one need to somehow start and wrap the `console` backend. 

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[Stephan Epping]

Oh, it is working in Elixir 1.4. See https://github.com/elixir-lang/elixir/issues/5754#issuecomment-278785958