src/util/Log.lua

-- Licensed to the Apache Software Foundation (ASF) under one
-- or more contributor license agreements.  See the NOTICE file
-- distributed with this work for additional information
-- regarding copyright ownership.  The ASF licenses this file
-- to you under the Apache License, Version 2.0 (the
-- "License"); you may not use this file except in compliance
-- with the License.  You may obtain a copy of the License at
--
--   https://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing,
-- software distributed under the License is distributed on an
-- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-- KIND, either express or implied.  See the License for the
-- specific language governing permissions and limitations
-- under the License.

local Logging = require "logging"
local fileLogging = require "logging.file"

-- The logging module for logging to console or any file
local Log = {
    enabled = true
}
Log.__index = Log

-- returns logger function for logging to console
function Log.getLogger()
    local o = {}
    setmetatable(o, Log)
    o.logger = Logging.new(function(self, level, message)
        print(level, message)
        return true
      end)
    return o
end

-- returns logger function for logging to file and @param: filePath = path of the log file
function Log:getFileLogger(filePath)
    if not filePath then
        error("no filePath for logger provided")
    end
    local o = {}
    self.__index = self
    setmetatable(o, self)
    o.logger = fileLogging(filePath)
    return o
end 

-- logs the information passed to it if log is enabled and logger exists
function Log:info(...)
    if self.enabled and self.logger then
        self.logger:info(...)
    end
end

return Log