luci.sgi.cgi.run()对“/”路径的处理

原文地址：http://blog.csdn.net/hui523hui523hui523/article/details/38943693

代码分析

1，启动：

在浏览器中输入： 会自动跳到cgi-bin/luci

luci\modules\base\htdocs\cgi-bin\luci

#!/usr/bin/lua -- 执行命令的路径
require"luci.cacheloader" -- 导入 cacheloader 包
require"luci.sgi.cgi" -- 导入 sgi.cgi 包
luci.dispatcher.indexcache = "/tmp/luci-indexcache" --cache 缓存路径地址
luci.sgi.cgi.run() -- 执 行 run 方法，此方法位于 luci\modules\base\luasrc\sgi\cgi.lua 中

#!/usr/bin/lua -- 执行命令的路径
require"luci.cacheloader" -- 导入 cacheloader 包
require"luci.sgi.cgi" -- 导入 sgi.cgi 包
luci.dispatcher.indexcache = "/tmp/luci-indexcache" --cache 缓存路径地址
luci.sgi.cgi.run() -- 执 行 run 方法，此方法位于 luci\modules\base\luasrc\sgi\cgi.lua 中

run方法

luci\modules\base\luasrc\sgi\cgi.lua

luci\modules\base\luasrc\sgi\cgi.lua

function run()
local r = luci.http.Request(
luci.sys.getenv(),
limitsource(io.stdin, tonumber(luci.sys.getenv("CONTENT_LENGTH"))),
ltn12.sink.file(io.stderr)
)

local x = coroutine.create(luci.dispatcher.httpdispatch) //开启协助线程---->调用luci\modules\base\luasrc\dispatcher.lua里的httpdispatch函数
local hcache = ""
local active = true

while coroutine.status(x) ~= "dead" do
local res, id, data1, data2 = coroutine.resume(x, r)

if not res then
print("Status: 500 Internal Server Error")
print("Content-Type: text/plain\n")
print(id)
break;
end

if active then
if id == 1 then
io.write("Status: " .. tostring(data1) .. " " .. data2 .. "\r\n")
elseif id == 2 then
hcache = hcache .. data1 .. ": " .. data2 .. "\r\n"
elseif id == 3 then
io.write(hcache)
io.write("\r\n")
elseif id == 4 then
io.write(tostring(data1 or ""))
elseif id == 5 then
io.flush()
io.close()
active = false
elseif id == 6 then
data1:copyz(nixio.stdout, data2)
data1:close()
end
end
end
end

function run()
	local r = luci.http.Request(
		luci.sys.getenv(),
		limitsource(io.stdin, tonumber(luci.sys.getenv("CONTENT_LENGTH"))),
		ltn12.sink.file(io.stderr)
	)
	
	local x = coroutine.create(luci.dispatcher.httpdispatch) //开启协助线程---->调用luci\modules\base\luasrc\dispatcher.lua里的httpdispatch函数
	local hcache = ""
	local active = true
	
	while coroutine.status(x) ~= "dead" do
		local res, id, data1, data2 = coroutine.resume(x, r)

		if not res then
			print("Status: 500 Internal Server Error")
			print("Content-Type: text/plain\n")
			print(id)
			break;
		end

		if active then
			if id == 1 then
				io.write("Status: " .. tostring(data1) .. " " .. data2 .. "\r\n")
			elseif id == 2 then
				hcache = hcache .. data1 .. ": " .. data2 .. "\r\n"
			elseif id == 3 then
				io.write(hcache)
				io.write("\r\n")
			elseif id == 4 then
				io.write(tostring(data1 or ""))
			elseif id == 5 then
				io.flush()
				io.close()
				active = false
			elseif id == 6 then
				data1:copyz(nixio.stdout, data2)
				data1:close()
			end
		end
	end
end

2，进入网页

在浏览器中输入： 会自动跳到cgi-bin/luci 登陆默认root 密码是空，默认的几个一级菜单都是在modules\admin-full\luasrc\controller\admin\ 这个目录下，index.lua为执行文件

module("luci.controller.admin.index", package.seeall) //声明一下这个模块, 模块入口为函数

function index()
local root = node() //定义了最外面的节点，也就是最上层的菜单显示
if not root.target then
root.target = alias("admin")
root.index = true
end

local page   = node("admin")
page.target  = firstchild() //----->luci\modules\base\luasrc\dispatcher.lua--->firstchild()
page.title   = _("Administration")
page.order   = 10
page.sysauth = "root"
page.sysauth_authenticator = "htmlauth" //---->luci\modules\base\luasrc\dispatcher.lua---->htmlauth() 找到哪个用户
page.ucidata = true
page.index = true

-- Empty services menu to be populated by addons
entry({"admin", "services"}, firstchild(), _("Services"), 40).index = true

entry({"admin", "logout"}, call("action_logout"), _("Logout"), 90)
end

module("luci.controller.admin.index", package.seeall)           //声明一下这个模块, 模块入口为函数

function index()
	local root = node()   //定义了最外面的节点，也就是最上层的菜单显示
	if not root.target then
		root.target = alias("admin")
		root.index = true
	end

	local page   = node("admin")
	page.target  = firstchild() //----->luci\modules\base\luasrc\dispatcher.lua--->firstchild()
	page.title   = _("Administration")
	page.order   = 10
	page.sysauth = "root"
	page.sysauth_authenticator = "htmlauth" //---->luci\modules\base\luasrc\dispatcher.lua---->htmlauth() 找到哪个用户
        page.ucidata = true
	page.index = true

	-- Empty services menu to be populated by addons
	entry({"admin", "services"}, firstchild(), _("Services"), 40).index = true

	entry({"admin", "logout"}, call("action_logout"), _("Logout"), 90)
end

entry 定义了菜单下的一个子菜单。

entry(路径, 调用目标, _("显示名称"), 显示顺序)

entry(path, target, title=nil, order=nil)

第1项为菜单入口；

第2项为菜单对应的页面，可以是lua的源代码文件，也可以是html页面，甚至可以是以上两种页面的组合。（alias是指向别的entry的别名，from调用的某一个view，cbi调用某一个model，call直接调用函数）

第3项是菜单的文本，直接添加string不会国际化，_("string"),就国际化了

第4项是同级菜单下，此菜单项的位置，从大到小。

3,登陆

目录：luci\modules\base\luasrc\dispatcher.lua

function authenticator.htmlauth(validator, accs, default)
local user = luci.http.formvalue("username")
local pass = luci.http.formvalue("password")

if user and validator(user, pass) then
return user
end

require("luci.i18n")
require("luci.template")
context.path = {}
luci.template.render("sysauth", {duser=default, fuser=user})
return false

end

function authenticator.htmlauth(validator, accs, default)
	local user = luci.http.formvalue("username")
	local pass = luci.http.formvalue("password")

	if user and validator(user, pass) then
		return user
	end

	require("luci.i18n")
	require("luci.template")
	context.path = {}
	luci.template.render("sysauth", {duser=default, fuser=user})
	return false

end

4.子菜单项

function _firstchild()
local path = { unpack(context.path) }
local name = table.concat(path, ".") //当前目录下,既：luci\modules\admin-full\luasrc\controller\admin\
local node = context.treecache[name]

local lowest
if node and node.nodes and next(node.nodes) then
local k, v
for k, v in pairs(node.nodes) do
if not lowest or
(v.order or 100) < (node.nodes[lowest].order or 100)
then
lowest = k
end
end
end

assert(lowest ~= nil,
"The requested node contains no childs, unable to redispatch")

path[#path+1] = lowest
dispatch(path)
end

--- Alias the first (lowest order) page automatically
function firstchild()
return { type = "firstchild", target = _firstchild }
end

function _firstchild()
   local path = { unpack(context.path) }
   local name = table.concat(path, ".")   //当前目录下,既：luci\modules\admin-full\luasrc\controller\admin\
   local node = context.treecache[name]

   local lowest
   if node and node.nodes and next(node.nodes) then
	  local k, v
	  for k, v in pairs(node.nodes) do
		 if not lowest or
			(v.order or 100) < (node.nodes[lowest].order or 100)
		 then
			lowest = k
		 end
	  end
   end

   assert(lowest ~= nil,
		  "The requested node contains no childs, unable to redispatch")

   path[#path+1] = lowest
   dispatch(path)
end

--- Alias the first (lowest order) page automatically
function firstchild()
   return { type = "firstchild", target = _firstchild }
end

既：

entry({"admin", "services"}, ｛"firstchild","network.lua system.lua ......"｝, _("Services"), 40).index = true

entry({"admin", "services"}, ｛"firstchild","network.lua system.lua ......"｝, _("Services"), 40).index = true

如上可以看出，登陆后第一级目录如下：luci\modules\admin-full\luasrc\controller\admin\下的xxx.lua文件

增加一个菜单：