libs/web: add assert() statements for unresolvable function case

diff --git a/libs/web/luasrc/dispatcher.lua b/libs/web/luasrc/dispatcher.lua
index 911f2f4..7c77f2e 100644 (file)
--- a/libs/web/luasrc/dispatcher.lua
+++ b/libs/web/luasrc/dispatcher.lua
@@ -761,10 +761,18 @@ end
 
 
 local function _call(self, ...)
 
 
 local function _call(self, ...)

+       local func = getfenv()[self.name]
+       assert(func ~= nil,
+              'Cannot resolve function "' .. self.name .. '". Is it misspelled or local?')
+
+       assert(type(func) == "function",
+              'The symbol "' .. self.name .. '" does not refer to a function but data ' ..
+              'of type "' .. type(func) .. '".')
+

        if #self.argv > 0 then
        if #self.argv > 0 then

-               return getfenv()[self.name](unpack(self.argv), ...)
+               return func(unpack(self.argv), ...)

        else
        else

-               return getfenv()[self.name](...)
+               return func(...)

        end
 end
 
        end
 end