+5分钟:重构

+5分钟:重构¶

设计

/usr/local/openresty/nginx/conf
    +- my_openresty.conf    业务路由配置
      +- lua/               业务脚本入口
        +- readme.lua       /readme 响应
        +- chk.lua          /=/chk 响应
        +- ksc.lua          可复用的功能包

模块化¶

所以,兴冲冲,将代码分离出来:

-- KCS API support
module("ksc", package.seeall)
--curl as lua
curl = require "luacurl"
function _fetch_uri(url, c)
    local result = { }
    if c == nil then
        c = curl.new()
    end
    c:setopt(curl.OPT_URL, url)
    c:setopt(curl.OPT_WRITEDATA, result)
    c:setopt(curl.OPT_WRITEFUNCTION, function(tab, buffer)
        table.insert(tab, buffer)
        return #buffer
    end)
    local ok = c:perform()
    return ok, table.concat(result)
end
-- global var
--ngx.say(PHISHTYPE["2"])
APPKEY = "k-60666"
SECRET = "99fc9fdbc6761f7d898ad25762407373"
ASKHOST = "http://open.pc120.com"
ASKTYPE = "/phish/?"
function checkForValidUrl(uri)
    crtURI = ngx.encode_base64(uri)
    timestamp = ngx.now()
    signbase = ASKTYPE .. "appkey=" .. APPKEY .. "&q=" .. crtURI .. "&timestamp=" .. timestamp
    sign = ngx.md5(signbase .. SECRET)
    return ASKHOST .. signbase .. "&sign=" .. sign
end

精简原 chk.lua

ngx.req.read_body()
local method = ngx.var.request_method
local KSC = require "ksc"

if method ~= 'POST' then
    ngx.say('pls. only POST chk me;-)')
else
    local args = ngx.req.get_post_args()
    local uri = args.uri
    local chkURI = KSC.checkForValidUrl(uri)
    ok, html = KSC._fetch_uri(chkURI)
    ngx.say("_fetch_uri:\t", ok, "\t", html)
end

哗! 业务逻辑首屏得见!

撞!¶

但是! 立即...

*1 lua handler aborted: runtime error:
/usr/local/openresty/nginx/conf/lua/chk.lua:6: module 'ksc' not found:
no field package.preload['ksc']
no file '/usr/local/openresty/lualib/ksc.lua'
no file './ksc.lua'
no file '/usr/local/openresty/luajit/share/luajit-2.0.0-beta9/ksc.lua'
no file '/usr/local/share/lua/5.1/ksc.lua'
no file '/usr/local/share/lua/5.1/ksc/init.lua'
no file '/usr/local/openresty/luajit/share/lua/5.1/ksc.lua'
no file '/usr/local/openresty/luajit/share/lua/5.1/ksc/init.lua'
no file '/usr/local/openresty/lualib/ksc.so'
no file './ksc.so'
no file '/usr/local/lib/lua/5.1/ksc.so'
no file '/usr/local/openresty/luajit/lib/lua/5.1/ksc.so'
no file '/usr/local/lib/lua/5.1/loadall.so', client: 127.0.0.1, server: localhost, request: "POST /=/chk HTTP/1.1", host: "127.0.0.1:9090"

...

明显是没有找到 ksc.lua 包, 为毛?! - 一通乱搜索 - 据某处的示例修订:

-- ksc.lua
module(..., package.seeall)
,,,
-- chk.lua
local KSC = require "lua.ksc"

并增补 my_openresty.conf

server {
    lua_package_path '/usr/local/openresty/nginx/conf/lua/?.lua;;';
    ...

/opt/sbin/openresty.server reload 热加载新的配置文件

就可以了!

12:57 a.m., Thursday Jan. 16 吉米 :¶

lua_package_path '/usr/local/openresty/nginx/conf/lua/?.lua;;';

放到 server 外面去

lua_package_path '/usr/local/openresty/nginx/conf/lua/?.lua;;';
server {
...
}

善! 这个可以有 ;-)

仔细...¶

可是,立即遭到了 agentzh 的劝戒,,, - 再尝试,才知道

lua_package_path 不允许用在 server 或是 location 域中,只能在 http 中!

lua_package_path 增补后, Nginx 仅仅 reload 可能不加载这一行为,最好 restart !

不相信! 尝试一下,才真正见到日志中的 [emerg]

Checking configuration for correct syntax and
then trying to open files referenced in configuration...
nginx: [emerg] "lua_package_path" directive
is not allowed here in
/usr/local/openresty/nginx/conf/my_openresty.conf:10
nginx: configuration file
/usr/local/openresty/nginx/conf/nginx.conf test failed

其实,这本身,在 HttpLuaModule 的维基手册示例第一行就暗示过!

插图 2-1 维基中手册文档的提示

Warning

(~.~)

这得要多少心灵相通才意识的到吼?!

快速修订回来:

-- ksc.lua
module("ksc", package.seeall)
,,,

-- chk.lua
local KSC = require "ksc"

一切如愿鸟 !-)

12:57 a.m., Thursday Jan. 16 吉米 :¶

-- chk.lua
local KSC = require "lua.ksc"

不要修改..

这个得研究一下,不过,形式上的确不进行消减要直觉的多, 谢谢!

复用?¶

对于各种意外,其实,很想直接使用 /readme 中的输出就好的,

根据以往幻灯中的提示,使用 ngx.location.capture()

if method ~= 'POST' then
    ngx.say('pls. only POST chk me;-)')
    local readme = ngx.location.capture("/readme")
    if readme.status == 200 then
        ngx.say(readme.body)
    end

效果

$ curl  localhost:9090/=/chk
pls. only POST chk me;-)
URIsAok4openresty v12.03.6
        usage:$crul -d 'uri=http://sina.com' 127.0.0.1:9090/=/chk

BINGO!

小结¶

42:01 ~ 这两个重构,纯粹是复制/粘贴,5分鈡,整出来不难吧?

但是,过程中的心理冲突,绝对不轻
比如,为毛 ngx.redirect() 不重定向 ?!
- 俺是首先尝试使用重定向来合并输出的
- 结果,只是使用标准的 http 302 状态码返回而已
等等,都需要补课,老实查阅文档,认真领悟,大胆尝试,建立靠谱的思路和反应,,,

chaos2openResty 2.1.130619 documentation

+5分钟:重构¶

模块化¶

撞!¶

12:57 a.m., Thursday Jan. 16 吉米 :¶

仔细...¶

12:57 a.m., Thursday Jan. 16 吉米 :¶

复用?¶

小结¶