├── README.md
└── lib
    └── resty
        └── logger.lua


/README.md:
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 1 | How to use?
 2 | 
 3 | local logger = require("resty.logger");
 4 | 
 5 | logger.debug("i am debug");  --for debug
 6 | 
 7 | logger.info("i am info");    --for info
 8 | 
 9 | logger.error("i am error");  --for error
10 | 
11 | 


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/lib/resty/logger.lua:
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 1 | --module("resty.logger", package.seeall)
 2 | 
 3 | local bit = require "bit"
 4 | local ffi = require "ffi"
 5 | local ffi_new = ffi.new
 6 | local ffi_str = ffi.string
 7 | local C = ffi.C;
 8 | local bor = bit.bor;
 9 | local ngx_today = ngx.today;
10 | local ngx_localtime = ngx.localtime
11 | local setmetatable = setmetatable 
12 | local _error = error    
13 | 
14 | module(...)
15 | 
16 | _VERSION = '0.01'
17 | 
18 | local mt = { __index = _M } 
19 | 
20 | ffi.cdef[[
21 | int write(int fd, const char *buf, int nbyte);
22 | int open(const char *path, int access, int mode);
23 | int close(int fd);
24 | ]]
25 | 
26 | local O_RDWR   = 0X0002; 
27 | local O_CREAT  = 0x0040;
28 | local O_APPEND = 0x0400;
29 | local S_IRWXU  = 0x01C0;
30 | local S_IRGRP  = 0x0020;
31 | local S_IROTH  = 0x0004;
32 | 
33 | -- log level
34 | local LVL_DEBUG = 1;
35 | local LVL_INFO  = 2;
36 | local LVL_ERROR = 3;
37 | local LVL_NONE  = 999;
38 | 
39 | local today = ngx_today();
40 | 
41 | local logger_level = LVL_INFO;
42 | local logger_file = "/tmp/lomemo_custom.log.";
43 | local logger_fd = C.open(logger_file..today, bor(O_RDWR, O_CREAT, O_APPEND), bor(S_IRWXU, S_IRGRP, S_IROTH));
44 | 
45 | function shift_file()
46 | 	if ngx_today() ~= today then
47 | 		C.close(logger_fd);
48 | 		today = ngx_today();
49 | 		logger_fd = C.open(logger_file..today, bor(O_RDWR, O_CREAT, O_APPEND), bor(S_IRWXU, S_IRGRP, S_IROTH));
50 | 	end
51 | end
52 | 
53 | function debug(msg)
54 | 		if logger_level > LVL_DEBUG then return end;
55 | 		shift_file();
56 | 
57 | 		local c = ngx_localtime() .. "|" .."D" .. "|" .. msg .. "\n";
58 | 		C.write(logger_fd, c, #c);
59 | end
60 | 
61 | function info(msg)
62 | 		if logger_level > LVL_INFO then return end;
63 | 		shift_file();
64 | 		
65 | 		local c = ngx_localtime() .. "|" .."I" .. "|" .. msg .. "\n";
66 | 		C.write(logger_fd, c, #c);
67 | end
68 | 
69 | function error(msg)
70 | 		if logger_level > LVL_ERROR then return end;
71 | 		shift_file();
72 | 
73 | 		local c = ngx_localtime() .. "|" .."E" .. "|" .. msg .. "\n";
74 | 		C.write(logger_fd, c, #c);
75 | end
76 | 
77 | local class_mt = {
78 | 	-- to prevent use of casual module global variables
79 | 	__newindex = function (table, key, val)
80 | 		_error('attempt to write to undeclared variable "' .. key .. '"')
81 | 	end
82 | }
83 | 
84 | setmetatable(_M, class_mt)
85 | 


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