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[root@netkiller openresty]# vim /srv/openresty/nginx/conf/nginx.conf
server {
listen 8080;
location / {
default_type text/html;
content_by_lua_block {
ngx.say("<p>Hello world!!!</p>")
}
}
}
重载配置文件
[root@netkiller openresty]# bin/openresty -s reload
测试效果
[root@netkiller openresty]# curl http://www.netkiller.cn
<p>Hello world!!!</p>
当前时间
[root@netkiller lua]# cat time.lua
print(os.time())
[root@netkiller lua]# lua time.lua
1670496310
日期
[root@netkiller lua]# cat date.lua
local d1 = os.date("%Y-%m-%d %H:%M:%S")
print(d1)
[root@netkiller lua]# lua date.lua
2022-12-08 19:07:45
[root@netkiller lua]# cat date.lua
local d1 = os.date("%Y-%m-%d %H:%M:%S")
print(d1)
local d2 = os.date("%Y-%m-%d %H:%M:%S", os.time())
print(d2)
[root@netkiller lua]# lua date.lua
2022-12-08 19:12:11
2022-12-08 19:12:11
[root@netkiller lua]# cat list.lua
local fruits = { "apple", "orange", "pear", "banana" }
for _, fruit in pairs(fruits) do
if fruit == "pear" then
print("We Found it!")
else
print("Oh no, keep traversing!")
end
end
[root@netkiller lua]# lua list.lua
Oh no, keep traversing!
Oh no, keep traversing!
We Found it!
Oh no, keep traversing!
location /param {
content_by_lua_block {
local arg = ngx.req.get_uri_args()
for k,v in pairs(arg) do
ngx.say("[GET ] key:", k, " value:", v)
end
ngx.req.read_body()
local arg = ngx.req.get_post_args()
for k,v in pairs(arg) do
ngx.say("[POST] key:", k, " value:", v)
end
}
}
[root@netkiller nginx]# curl 'http://www.netkiller.cn/param?id=111&name=neo&nickname=netkiller'
[GET ] key:nickname value:netkiller
[GET ] key:name value:neo
[GET ] key:id value:111
[root@netkiller nginx]# curl http://www.netkiller.cn/param -d 'name=Neo&nickname=netkiller'
[POST] key:nickname value:netkiller
[POST] key:name value:Neo
lua_need_request_body on;
location /body {
content_by_lua_block {
local data = ngx.req.get_body_data()
ngx.say("body: ", data)
}
}
[root@netkiller openresty]# bin/openresty -s reload
[root@netkiller openresty]# curl http://www.netkiller.cn/body -d Hello
body: Hello
[root@netkiller openresty]# curl http://www.netkiller.cn/body -d name=neo
body: name=neo
[root@netkiller openresty]# curl http://www.netkiller.cn/body -d "{\"status\":true}"
body: {"status":true}
需求如下，我们需要删除两个参数 password 跟 accesskey
location = /test {
rewrite_by_lua '
local args = ngx.req.get_uri_args()
args.password= nil
args.accesskey = nil
ngx.req.set_uri_args(args)
';
echo $args;
}
测试效果
[root@netkiller ~]# curl 'http://localhost/test?username=netkiller&password=123456&accesskey=112233&name=Neo&city=Shenzhen'a
username=netkiller&name=Neo&city=Shenzhena
我们可以看到两个参数已经被干掉。
ngx.var.[variable]
location /test {
set $name 'chen';
content_by_lua_block {
ngx.say("Name: ",ngx.var.name)
}
}
localtion ^~ /static/ {
set_by_lua $domain 'return "https://"..os.getenv("ENV")..".netkiller.cn"';
proxy_pass $domain/resource$request_uri;
}
location /json {
content_by_lua_block {
local cjson = require("cjson");
local json_text = '{"foo":"bar"}'
local data = cjson.decode(json_text)
ngx.say("foo: ", data["foo"])
}
}
剥离一层数组，注意第一个元素下标是1，不是0
local cjson = require("cjson");
local json_text = '[{"foo":"bar"}]'
local data = cjson.decode(json_text)
ngx.say("foo: ", data[1]["foo"])
local redisClient = require("resty.redis");
local redis = redisClient:new();
local ip = "127.0.0.1";
local port = 6379;
local ok,err = redis:connect(ip,port);
if not ok then
log.local_println("redis","Cannot connect, host: " .. ip .. ", port: " .. port)
return nil, err
end;
local ok,err = redis:get("key");
if not ok then
ngx.say("get key err",err);
return;
else
ngx.say(ok);
end;
location /redis {
content_by_lua_block {
local redisClient = require("resty.redis");
local redis = redisClient:new();
local ip = "127.0.0.1";
local port = 6379;
local ok,err = redis:connect(ip,port);
if not ok then
log.local_println("redis","Cannot connect, host: " .. ip .. ", port: " .. port)
return nil, err
end;
local ok,err = redis:get("key");
if not ok then
ngx.say("get key err",err);
return;
else
ngx.say(ok);
end;
}
}
测试
[root@netkiller openresty]# redis-cli
127.0.0.1:6379> set key Helloworld!!!
OK
127.0.0.1:6379> exit
[root@netkiller openresty]# curl http://www.netkiller.cn/redis
Helloworld!!!
lua_shared_dict my_cache 128m;
server {
listen 8080;
location /cache {
content_by_lua_block {
local cache = ngx.shared.my_cache
local key = 'nickname'
local value ='netkiller'
local exptime = 0
local result = cache:get(key)
if not result then
local succ, err, forcible = cache:set(key, value, exptime)
ngx.say("set", succ)
else
ngx.say("Value: ".. result)
end;
}
}
}
在 server 下面增加 error_log 配置，这里只记录 notice
server {
listen 8080;
error_log logs/lua.log notice;
打印日志
ngx.log(ngx.NOTICE, "det: ", json_string)
日志输出
2022/08/04 13:58:52 [notice] 830752#0: *247 [lua] content_by_lua(nginx.conf:159):18: get: {"key":"platfrom","status":false,"value":""}, client: 127.0.0.1, server: , request: "GET /grey/get?key=platfrom HTTP/1.1", host: "localhost:8080"
2022/08/04 13:58:55 [notice] 830752#0: *248 [lua] content_by_lua(nginx.conf:185):22: set: {"exptime":0,"key":"platfrom","status":true,"value":"111"}, client: 127.0.0.1, server: , request: "GET /grey/set?key=platfrom&value=111 HTTP/1.1", host: "localhost:8080"
2022/08/04 13:58:59 [notice] 830752#0: *249 [lua] content_by_lua(nginx.conf:203):13: det: {"status":true,"key":"platfrom"}, client: 127.0.0.1, server: , request: "GET /grey/del?key=platfrom HTTP/1.1", host: "localhost:8080"
日志级别：
ngx.STDERR 标准输出
ngx.EMERG 紧急报错
ngx.ALERT 报警
ngx.CRIT 严重，系统故障， 触发运维告警系统
ngx.ERR 错误，业务不可恢复性错误
ngx.WARN 提醒， 业务中可忽略错误
ngx.NOTICE 提醒， 业务中比较重要信息
ngx.INFO 信息， 业务琐碎日志信息， 包含不同情况判断等
ngx.DEBUG 调试