Loki authentication for deployed lambda functions

[mihai-dobre]

I've deployed a lambda function using the loki-shipper.py. It has LOKI_ENDPOINT as environment variable but it doesn't have any authentication. Loki requires authentication in order to be able to push logs to the endpoint(I'm using grafana cloud and I've configured a loki endpoint on the grafana logs dashboard).

I've made all the changes and updated the docs(Readme.md) . Please check the blow archive as I wasn't able to raise a PR with the changes.
loki-shipper-auth-readme.zip

[asanz-mrmilu]

It fails when executing the command "shipper" with auth:

Traceback (most recent call last):
  File "demo/cli.py", line 300, in <module>
    cli()
  File "/home/adsanz/Downloads/loki-shipper/venv/lib/python3.8/site-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/home/adsanz/Downloads/loki-shipper/venv/lib/python3.8/site-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/home/adsanz/Downloads/loki-shipper/venv/lib/python3.8/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/adsanz/Downloads/loki-shipper/venv/lib/python3.8/site-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/adsanz/Downloads/loki-shipper/venv/lib/python3.8/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/adsanz/Downloads/loki-shipper/venv/lib/python3.8/site-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
TypeError: shipper() got an unexpected keyword argument 'user'

[asanz-mrmilu]

For this to work "loki_user" and "loki_password" should be renamed to "user" and "password" since that's the name they get from click.options() @mihai-dobre

@cli.command(short_help="Deploy Loki shipper lambda function.")
@click.option('-l', '--loki', default='http://localhost:3100', help='Loki endpoint URL')
@click.option('-U', '--user', default='', help='User for Loki authentication')
@click.option('-W', '--password', default='', help='Password for Loki authentication')
@click.option('-b', '--build', default=False, is_flag=True, help='Flag indicates if deployment packages should be build')
@click.argument('action', nargs=1, type=click.Choice(['start', 'stop']))
@click.pass_context
def shipper(context, loki, action, build, user='', password=''):
    """        Starts/Stops the shipper lambda function    """
    if build or __should_package():
        context.invoke(package)
    config = {
        'FunctionName': SHIPPER_NAME,
        'Runtime': 'python3.7',
        'Role': '',  # Injected on deployment
        'Handler': 'loki-shipper.lambda_handler',
        'Code': {'ZipFile': open(SHIPPER_ZIP, 'rb').read()},
        'Description': 'Loki Shipper',
        'Environment': {
            'Variables': {
                'LOKI_ENDPOINT': loki,
                'LOKI_USER': user,
                'LOKI_PASSWORD': password
            }
        }
    }
    __start_lambda(config) if action == 'start' else __stop_lambda(config)