Lua scripting load external script.

[Emo Leumassi]

```
 "endpoint": "/apps/{id}",
      "output_encoding": "no-op",
      "method": "GET",
      "backend": [
        {
          "host": [
            "http://xxx.yyy.zz:8888"
          ],
          "url_pattern": "/apps/{id}",
          "extra_config": {
            "modifier/lua-backend": {
              "sources": [
                "/etc/krakend/Hello.lua"
              ],
              "post": "local r = response.load(); printPostBody(r:body());",
              "allow_open_libs": true
            }
          }
        }
      ]
    },
```

My Hello.lua:
```
local mylua = require("cjson")

function printPostBody(body)
    print(body);
end
```

When i add this part: `local mylua = require("cjson")` i got this error:
```
2023/10/08 09:36:23 [Recovery] 2023/10/08 - 09:36:23 panic recovered:
runtime error: slice bounds out of range [-1:]
/usr/local/go/src/runtime/panic.go:153 (0xf3dc7e)
/go/pkg/mod/github.com/krakendio/bin...@v0.0.0-20230413105421-1bbe94e65f45/error.go:140 (0x1971f64)
/go/pkg/mod/github.com/krakendio/bin...@v0.0.0-20230413105421-1bbe94e65f45/binder.go:27 (0x1970866)
/go/pkg/mod/github.com/krakendio/bin...@v0.0.0-20230413105421-1bbe94e65f45/error.go:201 (0x1972397)
/go/pkg/mod/github.com/krakendio/bin...@v0.0.0-20230413105421-1bbe94e65f45/binder.go:43 (0x19707ee)
/go/pkg/mod/github.com/krakendio/bin...@v0.0.0-20230413105421-1bbe94e65f45/binder.go:26 (0x1970785)
/go/pkg/mod/github.com/krakendio/krakend-lua/v...@v2.1.2/proxy/proxy.go:75 (0x1979793)
/go/pkg/mod/github.com/luraproject/lura/v...@v2.3.0/proxy/balancing.go:77 (0x13080a8)
/go/pkg/mod/github.com/luraproject/lura/v...@v2.3.0/proxy/http.go:113 (0x130db84)
/go/pkg/mod/github.com/luraproject/lura/v...@v2.3.0/router/gin/endpoint.go:50 (0x1bbf674)
/go/pkg/mod/github.com/gin-gonic/g...@v1.9.1/context.go:174 (0x1bb49c1)
/go/pkg/mod/github.com/gin-gonic/g...@v1.9.1/recovery.go:102 (0x1bb49ac)
/go/pkg/mod/github.com/gin-gonic/g...@v1.9.1/context.go:174 (0x1bb3ae6)
/go/pkg/mod/github.com/gin-gonic/g...@v1.9.1/logger.go:240 (0x1bb3ac9)
/go/pkg/mod/github.com/gin-gonic/g...@v1.9.1/context.go:174 (0x1bb296a)
/go/pkg/mod/github.com/gin-gonic/g...@v1.9.1/gin.go:620 (0x1bb25f1)
/go/pkg/mod/github.com/gin-gonic/g...@v1.9.1/gin.go:576 (0x1bb211c)
/usr/local/go/src/net/http/server.go:2936 (0x128a0b5)
/usr/local/go/src/net/http/server.go:1995 (0x1285251)
/usr/local/go/src/runtime/asm_amd64.s:1598 (0xf761a0)
```

[Albert Lombarte]

Hi,

You cannot import libraries with require.

You should load any Lua script under the scripts property in the configuration.

El dia diumenge, 8 d’octubre de 2023 a les 11:48:05 UTC+2, Emo Leumassi va escriure:

/go/pkg/mod/github.com/krakendio/krakend-lua/v2@v2.1.2/proxy/proxy.go:75 (0x1979793)

[Jose Augusto Batista]

What would be the correct way to use it?

/go/pkg/mod/github.com/krakendio/krakend-lua/v...@v2.1.2/proxy/proxy.go:75 (0x1979793)

[Daniel Lopez]

Here you have a working example

lua snippet: https://github.com/krakend/krakend-ce/blob/master/tests/fixtures/lua/collection.lua#L1-L10

configuration: https://github.com/krakend/krakend-ce/blob/master/tests/fixtures/krakend.json#L594-L626

Kind regards

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