* libs/httpd: Add limit for luci handler

diff --git a/libs/httpd/luasrc/httpd/handler/luci.lua b/libs/httpd/luasrc/httpd/handler/luci.lua
index 0937413..65f3f01 100644 (file)
--- a/libs/httpd/luasrc/httpd/handler/luci.lua
+++ b/libs/httpd/luasrc/httpd/handler/luci.lua
@@ -23,12 +23,16 @@ local ltn12 = require("luci.ltn12")
 Luci = luci.util.class(luci.httpd.module.Handler)
 Response = luci.httpd.module.Response
 
-function Luci.__init__(self)
+function Luci.__init__(self, limit)
        luci.httpd.module.Handler.__init__(self)
+       self.limit = limit or 5
+       self.running = {}
+       setmetatable(self.running, {__mode = "v"})
 end
 
 function Luci.handle_head(self, ...)
        local response, sourceout = self:handle_get(...)
+       self.running = self.running - 1
        return response
 end
 
@@ -37,6 +41,11 @@ function Luci.handle_post(self, ...)
 end
 
 function Luci.handle_get(self, request, sourcein, sinkerr)
+       if self.limit and #self.running >= self.limit then
+               return self:failure(503, "Overload")
+       end
+       table.insert(self.running, coroutine.running())
+       
        local r = luci.http.Request(
                request.env,
                sourcein,
@@ -57,6 +66,7 @@ function Luci.handle_get(self, request, sourcein, sinkerr)
                        status = 500
                        headers["Content-Type"] = "text/plain"
                        local err = {id}
+                       self.running = self.running - 1
                        return Response( status, headers ), function() return table.remove(err) end
                end