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log.lua
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log.lua
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--[[
Copyright © 2015 Mihail Zuev <z.m.c@list.ru>.
Author: Mihail Zuev <z.m.c@list.ru>.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the <organization> nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
--]]
local colors = {
'\27[0m', -- No color, default color by current terminal
'\27[36m',-- Blue
'\27[32m',-- Green
'\27[33m',-- Yellow
'\27[31m',-- Red
'\27[35m' -- Pink
}
--The Log object itself
local log = setmetatable({
color = true, -- Indicates that we will use color output in the terminal
file = nil, -- Path to log file
level = 'trace', -- Default log level
levels = {'trace','debug','info','warn','error','fatal'}
},{
__index = function(t,k)
-- Checking if we has approrpriate log level
if t.levels[k] then
-- Checking 'log' function
if type(t.logger) == 'function' then
-- Current level
local level
-- Local copy of 'log' function
local logger = t.logger
if type(k) == 'number' then
level = k
elseif type(k) == 'string' then
level = t.levels[k]
end
-- A closure that allows us to set the current level as an environment variable
return function(...)
-- Set the current level as an environment variable and run it
setfenv(logger,setmetatable({level = level},{__index = _G}))(...)
end
end
end
return nil
end,
-- Allow call 'log' function without specifying the log level
__call = function(t,...)
if type(t[t.level]) == 'function' then
return t[t.level](...)
else
return t.logger(...)
end
end
})
-- Modify 'levels' array in to the hash
-- That will allow us to use the number when setting the logging level
for k,v in ipairs(log.levels) do
if not log.levels[v] then
log.levels[v] = k
end
end
-- Main function that will proccess log message
log.logger = function(...)
local level = level -- From Environment
local ident = log.ident and log.ident or debug.getinfo(3, "S").source
-- Not allowed levels less than the specified
if level < (type(log.level) == 'string' and log.levels[string.lower(log.level)] or tonumber(log.level)) then
return
end
-- Output to console
print(
string.format("%s%s [%s] %s:%s",
log.color
and colors[level]
or "",
os.date("%b %d %H:%M:%S"),
string.upper(log.levels[level]),
string.match(ident,"^.-/-([^%/]+)$"),
log.color
and "\27[0m"
or ""
),
...
)
-- If set then prepare log.file property
if log.file then
if not log.fd then -- log.file set but not openned
log.fd = io.open(log.file,"a")
local stat, err = pcall(log.fd.setvbuf,log.fd,"no")
if not stat then
print(err)
end
end
-- Output to log file
if io.type(log.fd) == 'file' then -- log.file is set and it's opened
log.fd:write(
string.format("%s [%s] %s: ",
os.date("%b %d %H:%M:%S"),
string.upper(log.levels[level]),
string.match(ident,"^.-/-([^%/]+)$")
),
string.format(
string.gsub(
string.format("%s%s",
string.rep("%s\t",select('#',...)),
"\n"
)
,'\t\n$','\n'
)
,...
)
)
end
end
end
-- Close the file descriptor associated with the log file
log.close = function()
if io.type(log.fd) == 'file' then -- log.file is set and it's opened
local stat, err = pcall(log.fd['close'],log.fd) -- Just in case
if not stat then -- Just print error message and move on
print(err)
end
end
log.fd = nil
end
return log