Name

lua-nginx-logging - logging utilities for nginx written in lua

Table of Contents

• Name
• Status
• Description
• Synopsis
• Limitations
• Installation
• TODO
• Author
• Copyright and License
• See Also

Status

This library is still under early development and considered experimental.

Description

This Lua library is a logging utility for the ngx_lua nginx module:

Synopsis

    lua_package_path "/path/to/lua-nginx-logging/lib/?.lua;;";
    
    server {
    
        location /logging/health/ {
            add_header Access-Control-Allow-Origin *;
            content_by_lua '
                local cjson  = require "cjson"
                local logging = require("logging")
                if logging and cjson then
                    ngx.say("healthy\n")
                    return ngx.exit(ngx.OK)
                end
            ';
        }
        
        location /logging/response/summary/(?<response_format>[\S]+)? {
            add_header Access-Control-Allow-Origin *;
            content_by_lua '
                local logging = require("logging")
                local response = logging.get_response_summary(ngx.shared.log_dict)
                return response
            ';
        }
        
        log_by_lua '
            local logging = require("logging")
            local request_time = ngx.now() - ngx.req.start_time()
            logging.log_response_time(ngx.shared.log_dict, request_time)
       ';
        
    }

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Limitations

• only supports JSON and raw output

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Installation

You can install it with luarocks luarocks install lua-nginx-logging

Otherwise you need to configure the lua_package_path directive to add the path of your lua-nginx-loggin source to ngx_lua's LUA_PATH search path, as in

    # nginx.conf
    http {
        lua_package_path "/path/to/lua-nginx-logging/?.lua;;";
        ...
    }

Ensure that the system account running your Nginx ''worker'' proceses have enough permission to read the .lua file.

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TODO

• Support other response formats
• log other things

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Author

James Marlowe "jamesmarlowe" [email protected], Lumate LLC.

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Copyright and License

This module is licensed under the BSD license.

Copyright (C) 2012-2014, by James Marlowe (jamesmarlowe) [email protected], Lumate LLC.

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.

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 THE COPYRIGHT HOLDER OR CONTRIBUTORS 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.

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See Also

• the ngx_lua module: http://wiki.nginx.org/HttpLuaModule
• log_by_lua: http://wiki.nginx.org/HttpLuaModule#log_by_lua

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