Name

lua-resty-stats - is a statistical module for nginx base on ngx_lua, Statistical key and values are configurable, can use the nginx core's variables and this module's variables. The statistical result store in mongodb.

Table of Contents

• Name
• Table of Contents
• Synopsis
• Variables
• Methods
  • add_def_stats
  • add_stats_config
  • init
  • log
• Simple Query And API
• Simple Demo
• Authors
• Copyright and License

Synopsis

    #set ngx_lua's environment variable:
    lua_package_path '/path/to/lua-resty-stats/lib/?.lua;/path/to/lua-resty-stats/lib/?/init.lua;/path/to/lua-resty-stats/view/?.lua;;';
    # init the lua-resty-stats
    init_worker_by_lua '
        local stats = require("resty.stats")
        -- add the default stats that named "stats_host"
        stats.add_def_stats()
        -- the general stats"s config
        local update = {["$inc"]= {count=1, ["hour_cnt.$hour"]=1, ["status.$status"]=1, 
                      ["req_time.all"]="$request_time", ["req_time.$hour"]="$request_time"}}
        
        -- stats by uri
        stats.add_stats_config("stats_uri", 
            {selector={date="$date",key="$uri"}, update=update,
             indexes={{keys={'date', 'key'}, options={unique=true}},{keys={'key'}, options={}}} })
            
        -- stats by arg        
        stats.add_stats_config("stats_arg", 
            {selector={date="$date",key="$arg_client_type"}, update=update,
             indexes={{keys={'date', 'key'}, options={unique=true}},{keys={'key'}, options={}}} })

        -- stats by uri and args 
        stats.add_stats_config("stats_uri_arg", 
            {selector={date="$date",key="$uri?$arg_from"}, update=update,
             indexes={{keys={'date', 'key'}, options={unique=true}},{keys={'key'}, options={}}} })

        -- stats by http request header
        stats.add_stats_config("stats_header_in", 
            {selector={date="$date",key="city:$http_city"}, update=update,
             indexes={{keys={'date', 'key'}, options={unique=true}},{keys={'key'}, options={}}} })
        
        -- stats by http response header
        stats.add_stats_config("stats_header_out", 
            {selector={date="$date",key="cache:$sent_http_cache"}, update=update,
             indexes={{keys={'date', 'key'}, options={unique=true}},{keys={'key'}, options={}}} })

        local mongo_cfg = {host="192.168.1.201", port=27017, dbname="ngx_stats"}
        local flush_interval = 2 -- second
        local retry_interval = 0.2 -- second
        -- init stats and start flush timer.
        stats.init(mongo_cfg, flush_interval, retry_interval)
    ';
    server {
        listen       80;
        server_name  localhost;

        location /byuri {            
            echo "byuri: $uri";
            log_by_lua '
                local stats = require("resty.stats")
                stats.log("stats_uri")
                stats.log("stats_host")
            ';
        }

        location /byarg {
            echo_sleep 0.005;    
            echo "login $args";
            log_by_lua '
                local stats = require("resty.stats")
                stats.log("stats_arg")
            ';
        }

        location /byarg/404 {
            request_stats statby_arg "clitype:$arg_client_type";        
            return 404;
            log_by_lua '
                local stats = require("resty.stats")
                stats.log("stats_arg")
            ';
        }

        location /byuriarg {
            echo "$uri?$args";
            log_by_lua '
                local stats = require("resty.stats")
                stats.log("stats_uri_arg")
            ';
        }

        location /byhttpheaderin {
            echo "city: $http_city";
            log_by_lua '
                local stats = require("resty.stats")
                stats.log("stats_header_in")
            ';
        }

        location /byhttpheaderout/ {
            proxy_pass http://127.0.0.1:82;
            log_by_lua '
                local stats = require("resty.stats")
                stats.log("stats_header_out")
            ';
        }
    }

    server {
        listen       82;
        server_name  localhost;
            location /byhttpheaderout/hit {
            add_header cache hit;
            echo "cache: hit";
        }
        location /byhttpheaderout/miss {
            add_header cache miss;
            echo "cache: miss";
        }
    }

	server {
	    listen 2000;
	    server_name localhost;
	 
	    location /stats {
	        set $template_root /path/to/lua-resty-stats/view;
	        content_by_lua_file '/path/to/lua-resty-stats/view/main.lua';
	    }
	}

Variables

• nginx_core module supports variable: http://nginx.org/en/docs/http/ngx_http_core_module.html#variables
• This module variables
  • date: current date in the format: 1970-09-28
  • time: current time in the format: 12:00:00
  • year: current year
  • month: current month
  • day: current date
  • hour: current hour
  • minute: current minute
  • second: current second

Methods

To load this library,

you need to specify this library's path in ngx_lua's lua_package_path directive. For example:

http {
   lua_package_path '/path/to/lua-resty-stats/lib/?.lua;/path/to/lua-resty-stats/lib/?/init.lua;/path/to/lua-resty-stats/view/?.lua;;';
}

you use require to load the library into a local Lua variable:

local stats = require("resty.stats")

Back to TOC add_def_stats

syntax: stats.add_def_stats()

add the predefined stats configs that contains:

stats_name: stats_host
stats_config:
{
    selector={date='$date',key='$host'}, 
    update={['$inc']= {count=1, ['hour_cnt.$hour']=1, ['status.$status']=1, 
            ['req_time.all']="$request_time", ['req_time.$hour']="$request_time"}},
            indexes={
                {keys={'date', 'key'}, options={unique=true}},
                {keys={'key'}, options={}}
            },
    }
}

After this method is called, when you used stats.log(stats_name) method, you can use these predefined statistics.

add_stats_config

syntax: stats.add_stats_config(stats_name, stats_config)

Add a custom statistical configuration item that contains stats_name and stats config.

• stats_name is the name of the statistics, and also is the name of the mongodb's table. The name will be used when calling the stats.log(stats_name) method.
• stats_config is used to define the values of statistics. stats_config is a table that contains some fileds:
  • selector a mongodb query statement. like: {date="$date",key="$host"}
  • update a mongodb update statement. like: {["$inc"]= {count=1, ["hour_cnt.$hour"]=1, ["status.$status"]=1, ["req_time.all"]="$request_time", ["req_time.$hour"]="$request_time"}}
  • indexes a table that contains all fields of the index.

The selector and update configuration can use variables.
Note that "$inc" is not a nginx variable, it's a mongodb's operator.

init

syntax: stats.init(mongo_cfg, flush_interval, retry_interval)

Initialization statistical library.

• mongo_cfg The mongodb configuration, contains fields:
  • host mongodb's host
  • port mongodb's port
  • dbname mongodb's database name.
• flush_interval flush data to the mongodb time interval, the time unit is seconds.
• retry_interval the retry time interval on flush error,the time unit is seconds.

log

syntax: stats.log(stats_name)

Collect the specified(by stats_name) statistical information at the log phrase.

• stats_name is one statistical name that add by stats.add_stats_config.
  if the stats_name is nil, log method will collect all the statistics that have been configured.

Back to TOC

Simple Query And API

lua-resty-stats with a simple query page and API interface, which can be used in the following steps:

• add location configuration to nginx.conf

location /stats {
    set $template_root /path/to/lua-resty-stats/view;
    content_by_lua_file '/path/to/lua-resty-stats/view/main.lua';
}

• Access query page. eg. http://192.168.1.xxx/stats:

• Access API:

# by date
curl http://127.0.0.1:8020/stats/api?table=stats_uri&date=2020-02-20&limit=100
# by date, today
curl http://127.0.0.1:8020/stats/api?table=stats_uri&date=today&limit=10

# by key(The date parameter is ignored.)
curl http://127.0.0.1:8020/stats/api?table=stats_uri&key=/path/to/uri

• The API response will look something like this:

{
    "stats": [
        {
            "hour_cnt": {
                "19": 24
            },
            "count": 24,
            "status": {
                "200": 24
            },
            "total": 24,
            "req_time": {
                "19": 13.262,
                "all": 13.262
            },
            "percent": 100,
            "key": "/path/to/uri",
            "date": "2020-09-24"
        }
    ]
}

If you've configured some other fields in your update, this will be different

Simple Demo

Simple Stats demo

You can include it in nginx.conf using the include directive. Such as: include /path/to/simple_stats.conf;

Authors

jie123108 [email protected]。

Back to TOC

Copyright and License

This module is licensed under the BSD license.

Copyright (C) 2020, by jie123108 [email protected]

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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