Add example of logging config file

In the doc, there is the description of --log-config <path> for the configuration of a config file. I think an example of config file could be really awesome for the new comers.

[luca-drf]

Not sure if this is helpful but I had the same issue as @mattiacampana and I solved by defining a new formatter, a new handler and configuring the root logger to use them. Then setting disable_existing_loggers: False allows existing uvicorn loggers to inherit the custom configuration without having to modify them at “runtime”:

version: 1
disable_existing_loggers: False
formatters:
  timestamped:
    format: '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
handlers:
  console:
    class: logging.StreamHandler
    level: INFO
    formatter: timestamped
    stream: ext://sys.stdout
root:
  level: INFO
  handlers: [console]

Another solution I found, in order to use uvicorn formatter classes (and not lose colors, for instance), is to re-define loggers like this:

version: 1
disable_existing_loggers: False
formatters:
  default:
    (): 'uvicorn.logging.DefaultFormatter'
    fmt: '%(asctime)s %(levelprefix)-9s %(name)s -: %(message)s'
  access:
    (): 'uvicorn.logging.AccessFormatter'
    fmt: '%(asctime)s %(levelprefix)-9s %(name)s -: %(client_addr)s - "%(request_line)s" %(status_code)s'
handlers:
  default:
    class: logging.StreamHandler
    formatter: default
    stream: ext://sys.stderr
  access:
    class: logging.StreamHandler
    formatter: access
    stream: ext://sys.stdout
loggers:
  uvicorn:
    level: INFO
    handlers:
      - default
  uvicorn.error:
    level: INFO
  uvicorn.access:
    level: INFO
    propagate: False
    handlers:
      - access

[luca-drf]

Not sure if this is helpful but I had the same issue as @mattiacampana and I solved by defining a new formatter, a new handler and configuring the root logger to use them. Then setting disable_existing_loggers: False allows existing uvicorn loggers to inherit the custom configuration without having to modify them at “runtime”:

version: 1
disable_existing_loggers: False
formatters:
  timestamped:
    format: '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
handlers:
  console:
    class: logging.StreamHandler
    level: INFO
    formatter: timestamped
    stream: ext://sys.stdout
root:
  level: INFO
  handlers: [console]