Distributed -- openresty+lua+redis

We have used it before nginx, It has a wealth of modules for us to use , because nginx By c Written in language , So before writing modules, you must use c/c++, later , Someone will lua The interpreter inherits nginx in , built-in ngx_lua modular , thus ,nginx Support lua

One 、OpenResty

OpenResty Is based on nginx An extension of the open source version , Integrated a lot of lua library

1. add to repo

cd /etc/yum.repos.d/
wget https://openresty.org/package/centos/openresty.repo

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2. install openresty

yum install openresty

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3. start-up openresty

openresty The default installation path is /usr/local/openresty/, One of the nginx Catalog , About openresty The startup and configuration of are the same as before nginx identical

cd /usr/local/openresty/nginx/conf

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modify openresty Of http modular To configure , newly added server modular , Use content_by_lua To perform a lua Code ：

    server{
        listen 8080;
        location /{
                default_type text/html;
                content_by_lua 'ngx.say("hello openresty")';
        }
    }

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start-up openresty：

cd /usr/local/openresty/nginx/sbin/
./nginx -p /usr/local/openresty/nginx/

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Browser access 8080 port ：

Two 、http visit Redis

It's done nginx perform lua sentence , Next let's look at nginx How to access the Redis Redis Environment construction can be seen in the previous article ： Distributed --Redis Installation and use of data types

1. obtain Redis data

Here is the passage nginx obtain Redis in key Corresponding value

1.1 start-up Redis

Start a default 6379 Port of Redis that will do , Here's what I built before Redis colony ：

1.2 modify nginx To configure

worker_processes  1;

events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;

    server {
        listen       80;
        server_name  localhost;

        location / {
                default_type text/plain;
                #  Set get redis in key by m Value 
                set $redis_key "m";
                redis_pass 127.0.0.1:6379;
                
                #  In case of 404, Just leave it to @fetch Handle 
                error_page 404 = @fetch;
        }
                
        location @fetch {
                root html;
        }

    }
}

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nginx Reload configuration ：

./nginx -p /usr/local/openresty/nginx/ -c /usr/local/openresty/nginx/conf/nginx-http.conf  -s reload

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1.3 adopt http visit

curl http://localhost/1.html

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result ：

redis Client side Settings m The key/value pair ：

Revisit ：

2. Set up Redis data

The way above 1, Just got Redis The data of , So how do you set that Redis The key value is right ？ If nginx Support redis Just follow your instructions , actually nginx Is to support the

2.1 modify nginx To configure

have access to redis2_query Keep up redis Instructions , To set the value , It can also be used redis Instruction get value ：

worker_processes  1;

events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;

    server {
        listen       80;
        server_name  localhost;

        location /get {
                #  Set a variable 
                set_unescape_uri $key "n";
                redis2_query get $key;
                redis_pass 127.0.0.1:6379;

                #  In case of 404, Just leave it to @fetch Handle 
                error_page 404 = @fetch;
        }

        location /set {
                #  Set a variable 
                set_unescape_uri $key "n";
                redis2_query set $key "hello2";
                redis2_pass 127.0.0.1:6379;
        }

        location @fetch {
                root html;
        }

    }
}

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nginx restart ：

./nginx -s stop
./nginx -p /usr/local/openresty/nginx/ -c /usr/local/openresty/nginx/conf/nginx-http2.conf

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2.2 Access test

curl http://localhost/get
curl http://localhost/set

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result ：

3、 ... and 、lua combination Nginx、Redis

The official introduction ：https://github.com/openresty/lua-resty-redis First ,OpenResty Integrate lua after , There are three kinds of calls lua The way ：

Way grammar	describe
content_by_lua	At first we have used , It supports the execution of a lua Code
content_by_lua_file	This statement supports the execution of a lua Script files , It's also the most used
content_by_lua_block	This statement supports the execution of a lua Code block , Use... For some simple scenarios

Let's use lua And Redis Interact

1. lua operation Redis data

lua operation Redis, The step is to introduce Redis modular , Connect Redis, And then operate

1.1 To write lua Script

Create a directory to store lua Script ：

mkdir lua
vi control_redis.lua

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The content is ：

--  introduce redis modular 
local redis = require("resty.redis")
--  Create a redis object 
local red = redis:new()

-- 1.  Connect redis
--  Multi parameter return 
local ok,err = red:connect("127.0.0.1",6379)
if not ok then
        ngx.say("connect failed:",err)
        return
end

-- 2.  Set up redis The key/value pair 
ok,err = red:set("luaKey","luaValue")
if not ok then
        ngx.say("set faild:",err)
        return
end

-- 3.  Read redis The key/value pair 
ret = red:get("luaKey")
ngx.say("read luaKey value:",ret)

return

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1.2 modify nginx To configure

Use content_by_lua_file Appoint lua The absolute path of the script ：

worker_processes  1;

events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;

    server {
        listen       8090;
        server_name  localhost;

        location / {
                default_type text/html;
                content_by_lua_file /usr/local/openresty/nginx/lua/control_redis.lua;
        }

    }
}

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restart nginx：

./nginx -s stop
./nginx -p /usr/local/openresty/nginx/ -c /usr/local/openresty/nginx/conf/nginx-lua.conf

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1.3 test

2. lua obtain nginx in http Of get Request parameters

2.1 To write lua Script

vi http_get.lua

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Use ngx.req.get_uri_args() obtain , The content is ：

--  Back to a table type 
local args = ngx.req.get_uri_args()


for k,v in pairs(args) do
        ngx.say("key:"..k.."value:"..v)
end

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2.2 modify nginx To configure

New port listening ：

    server {
        listen 8091;
        server_name localhost;

        location /get {
                default_type text/html;
                content_by_lua_file /usr/local/openresty/nginx/lua/http_get.lua;
        }
    }

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Reload the configuration file ：

./nginx -p /usr/local/openresty/nginx/ -c /usr/local/openresty/nginx/conf/nginx-lua.conf -s reload

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2.3 test

http://192.168.42.4:8091/get?name= Zhang San &age=19

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3. lua obtain nginx in http Of post Request parameters

post There are two kinds of requests ：body Key value pairs and body Request body . The latter corresponds to the popular json Format

3.1 To write lua Script

post To obtain the request parameters, you need to call ngx.req.read_body() Method

Key value pair ：

vi http_post_kv.lua

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Use ngx.req.get_post_args() obtain , The content is ：

--  Read first 
ngx.req.read_body()
--  Get more 
local params = ngx.req.get_post_args()

for k,v in pairs(params) do 
        ngx.say("key:"..k.." value:"..v)
end

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---

Request body ：

vi http_post_body.lua

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Use ngx.req.get_body_data() obtain , The content is ：

--  Read first 
ngx.req.read_body()
--  Then get the request body 
local body = ngx.req.get_body_data();

ngx.say(body)

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3.2 modify nginx To configure

    server {
        listen 8092;
        server_name localhost;

        location /post_kv {
                default_type text/html;
                content_by_lua_file /usr/local/openresty/nginx/lua/http_post_kv.lua;
        }
        
        location /post_body {
                default_type text/html;
                content_by_lua_file /usr/local/openresty/nginx/lua/http_post_body.lua;
        }
    }

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Reload nginx To configure ：

./nginx -p /usr/local/openresty/nginx/ -c /usr/local/openresty/nginx/conf/nginx-lua.conf -s reload

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3.3 test

Key value pair ：

---

Request body ：

4. lua obtain nginx in http Request header for

4.1 To write lua Script

vi http_headers.lua

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Request header passed ngx.req.get_headers() obtain , The content is ：

local headers = ngx.req.get_headers()

for k,v in pairs(headers) do
        ngx.say("key:"..k.." value:"..v)
end

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4.2 modify nginx To configure

    server {
        listen 8093;
        server_name localhost;

        location /headers {
                default_type text/html;
                content_by_lua_file /usr/local/openresty/nginx/lua/http_headers.lua;
        }
    }

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Reload the configuration file ：

./nginx -p /usr/local/openresty/nginx/ -c /usr/local/openresty/nginx/conf/nginx-lua.conf -s reload

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4.3 test

That's all openresty+lua+redis Basic use of