"Openresty" passing parameters to Lua code

When I described the Forminputnginxmodule module earlier, I understood how openresty obtained the data of the post submission.

Then, if you need to process this data through LUA, you need to pass the data as a parameter into Lua, and Lua gets the data and returns the results to the Nginx to complete the process.

First, there is a POST request:

1 varJSON = {2Data"hello!"3 };4 $.post (5     'Save', 6 JSON,7 function (callback) {8 alert (callback);9     }Ten);

Then the Nginx configuration:

1 user root;2Worker_processes2;3 4Error_log logs/Error.log;5PID logs/Nginx.pid;6 7 Events {8Worker_connections1024x768;9 # multi_accept on;Ten } One  A http { - include mime.types; -  theAccess_log logs/Access.log; -      - server { -Listen the; + server_name localhost; -         +Location/ { ARoot/var/www/Aceeditor; at index index.htm index.html; -        } -             -Location/Save { - set_form_input $data data; - echo $data; in        } -     } to}

When we introduce the Forminputnginxmodule module, we see that this configuration obtains the data of the post submission through the Set_form_input method, and successfully returns the result to the foreground.

Now, we need to process the data on the post, so we pass data as a parameter to the LUA code, process it through the LUA code, and we need to return the result to Nginx.

Here, change the configuration of the nginx.conf 26~29 line:

1 location/Save {2    set_form_input $data data; 3     ' 4         Local " Zhang!!!  "5         return ngx.arg[1]. s; 6     ' $data; 7     echo $re; 8 }

Among them, the Set_by_lua method:

Syntax:set_by_lua $res <lua-script-str> [$arg 1 $arg 2 ...]

Function: Pass the parameter list to LUA and assign the return value of LUA to the RES variable.

Here, the Set_by_lua method passes data as a parameter to the LUA code, obtains this parameter in Lua via Ngx.arg[n], and then returns the result to Nginx after processing, then assigns the value to the variable Re,nginx and returns the re to the foreground. N in Ngx.arg[n] indicates the order in which the parameters are passed.

Look at the effect:

　　

As we can see, the foreground correctly obtains the result data that the Nginx passes through the LUA processing.

If you need to separate the LUA code, you can use the Set_by_lua_file method.

So there are LUA file M.lua:

1 Local " Zhang! asdsd!!  "2return ngx.arg[1]. S

Then change the configuration above to:

1 location/Save {2    set_form_input $data data; 3     Set_by_lua_file $re/var/www/aceeditor/M.lua $data; 4     echo $re; 5 }

Look at the results:

　　

"Openresty" passing parameters to Lua code