Error with lua

[AlexFisher94]

Describe the bug
Got an error from lua

2024/08/19 14:58:25 [error] 36#36: *771 lua entry thread aborted: runtime error: content_by_lua(nginx.conf:24):2: module 'cjson' not found:
        no field package.preload['cjson']
        no file './cjson.lua'
        no file '/usr/local/share/luajit-2.1/cjson.lua'
        no file '/usr/local/share/lua/5.1/cjson.lua'
        no file '/usr/local/share/lua/5.1/cjson/init.lua'
        no file './cjson.so'
        no file '/usr/local/lib/lua/5.1/cjson.so'
        no file '/usr/local/lib/lua/5.1/loadall.so'
stack traceback:
coroutine 0:
        [C]: in function 'require'
        content_by_lua(nginx.conf:24):2: in main chunk, client: 10.33.45.224, server: , request: "GET /lua HTTP/2.0", host: "sa-vm-sentry-test.sam.loc:5151"

To Reproduce

1. docker pull fabiocicerchia/nginx-lua
2. Correcting docker-compose.yml and docker-compose up -d
3. docker logs container id
4. See error

Expected behavior
See JSON logs from Sentry

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Additional context
Hello!
I want to check my JSON files from Sentry.
I've set up sentry and use this Docker-image nginx-lua
And when i want to see json from sentry in logs - i've got an error (described above)

What i do wrong?

Here's my nginx.conf

worker_processes auto;

events {
    worker_connections 1024;
}

http {
    lua_shared_dict request_body 30m;

    # Настройка путей для логов
    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;
    ssl_certificate /etc/ssl/svrauto/public.crt;
    ssl_certificate_key /etc/ssl/svrauto/private.key;

    server {
        listen 443 ssl http2;
        client_body_buffer_size 20K;
        client_header_buffer_size 4k;
        client_max_body_size 12m;
        large_client_header_buffers 2 12k;
        location /lua {
    # Обрабатываем POST запросы
            content_by_lua_block {
                local cjson = require "cjson"
                local log = ngx.log
                local ERR = ngx.ERR

                ngx.req.read_body()
                local body = ngx.req.get_body_data()

                if body then
                    local success, json = pcall(cjson.decode, body)

                    if success then
                        -- Записываем в лог содержимое JSON
                        log(ERR, "Received JSON: ", cjson.encode(json))

                        -- Отправляем JSON как строку
                        ngx.say(cjson.encode(json))
                    else
                        -- Записываем ошибку в лог
                        log(ERR, "Invalid JSON: ", body)

                        ngx.status = ngx.HTTP_BAD_REQUEST
                        ngx.say("Invalid JSON")
                    end
                else
                    -- Записываем ошибку в лог
                    log(ERR, "Empty body received")

                    ngx.status = ngx.HTTP_BAD_REQUEST
                    ngx.say("Empty body")
                end
            }
        }
    }
}

Thanks for any help!

[fabiocicerchia]

Hi @AlexFisher94, cjson is not install by default, you can enable it by running the following commands:

apk add gcc musl-dev coreutils wget
luarocks install lua-cjson