# keep our base image as small as possible
FROM unit:1.31.1-node20
# Alternatively, you can download the base image from AWS ECR:
# FROM public.ecr.aws/nginx/unit:1.31.1-node20

# port used by the listener in config.json
EXPOSE 8080

#application setup
RUN mkdir /www/ && echo '#!/usr/bin/env node                             \n\
    require("unit-http").createServer(function (req, res) {                \
        res.writeHead(200, {"Content-Type": "text/plain"});                \
        res.end("Hello, Node.js on Unit!")                                 \
    }).listen()                                                            \
    ' > /www/app.js                                                        \
# make app.js executable; link unit-http locally
    && cd /www && chmod +x app.js                                          \
    && npm link unit-http                                                  \
# prepare the app config for Unit
    && echo '{                                                             \
    "listeners": {                                                         \
        "*:8080": {                                                        \
            "pass": "applications/node_app"                                \
        }                                                                  \
    },                                                                     \
    "applications": {                                                      \
        "node_app": {                                                      \
            "type": "external",                                            \
            "working_directory": "/www/",                                  \
            "executable": "app.js"                                         \
        }                                                                  \
    }                                                                      \
    }' > /docker-entrypoint.d/config.json