Not working with NGNIX #27

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1. guysv commented on May 31, 2020

   

   guysv

   on May 31, 2020

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   I'd guess that json.lua is not in nginx's (maybe special) $LUA_PATH?
2. edenisn commented on May 31, 2020

   

   edenisn

   on May 31, 2020

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   ahhh, it's present in nginx.conf:

   lua_package_path "/usr/local/lib/lua/?.lua;;";
3. edenisn commented on May 31, 2020

   

   edenisn

   on May 31, 2020

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   If it's possible, can you pls provide example with NGINX? Thanks @guysv
4. edenisn commented on May 31, 2020

   

   edenisn

   on May 31, 2020

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   One more very strange thing: if I use code below in nginx.conf:

   location /test { content_by_lua_block { local json = require("json") ngx.say(json.encode({ 1, 2, 3, { x = 10 } })) } }

   It works fine

   [1,2,3,{"x":10}]
5. xphip commented on Jun 28, 2022

   

   xphip

   on Jun 28, 2022

   Last edited by xphip

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   Isn't a lib related issue but a third-party module limitation (openresty/lua-nginx-module).
   https://github.com/openresty/lua-nginx-module/blob/.../src/ngx_http_lua_output.c#L285

   According to the documentation, the ngx.say function expects a array table (with numeric index) as a parameter and not a table with string-type indexes.

   [error] 1265#1265: *64 lua entry thread aborted: runtime error: content_by_lua(default.conf:17):3: bad argument #1 to 'say' (non-array table found)
   stack traceback:
   coroutine 0:
   	[C]: in function 'say'
   

   Non-array table arguments will cause a Lua exception to be thrown.

   https://github.com/openresty/lua-nginx-module#ngxprint:~:text=Non%2Darray%20table...

   ---

   A possible solution would be to use the lib itself to encode to string:

   content_by_lua_block {
       local json = require("json")
       local decoded = json.decode('[1,2,3,{"x":10}]')
       local encoded = json.encode(decoded)
       ngx.say(encoded)
   }

   ---

   Tests:

   content_by_lua_block {
       ngx.say({["test"] = "ok"}) -- error
   }
   --
   content_by_lua_block {
       ngx.say({1, 2, 3, {["test"] = "ok"}}) -- error
   }
   --
   content_by_lua_block {
       ngx.say({1, 2, 3}) -- works
   }
   --
   content_by_lua_block {
       ngx.say({1, 2, 3, {1, 2}}) -- works
   }
   --
   content_by_lua_block {
       ngx.say({1, 2, 3, {[1] = "ok"}}) -- works
   }