# MBID Poller

This project provides a polling mechanism, packaged in a **Docker container**, to routinely check the MusicBrainz ID (MBID) status for items and then optionally trigger a search in a **Lidarr** instance.

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## 💡 Acknowledgements

The core logic for the polling mechanism in this project is based on an existing script generously shared by GitHub user **kchiem**.

We are utilizing and adapting the Perl script found in the following public Gist:

* **Original Script:** `kchiem/lidarr-ping.dist`
* **Link:** https://gist.github.com/kchiem/eb998ac3c6f5a96cbec03b8e8c3b21a6

We appreciate kchiem's contribution to the community!

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## 🚀 Setup and Usage

This project is designed to run as a service alongside a **Lidarr** instance using Docker Compose.

### 1. Prerequisites

Before starting, ensure you have:

1.  **Docker** and **Docker Compose** installed.
2.  A running **Lidarr** instance.
3.  The project files (`Dockerfile`, `poller.pl`, `docker-compose.yaml`, etc.) in a single directory.

### 2. Configure Docker Compose

The `mbid-poller` container needs to communicate with your Lidarr instance.

1.  **Rename the Example:** Rename the provided `docker-compose.yaml.example` to `docker-compose.yaml`.
2.  [cite_start]**Network Setup:** Ensure the `lidarr` and `mbid-poller` services are on the **same Docker network** (e.g., `example_network`)[cite: 4, 5]. If you use a different setup (like host network), update `LIDARR_BASE` accordingly.
3.  [cite_start]**Lidarr Base URL:** Verify the `LIDARR_BASE` environment variable in the `mbid-poller` service points to your Lidarr instance[cite: 5].

    ```yaml
    # Example for the default setup:
    - LIDARR_BASE=http://lidarr:8686 
    ```

### 3. Choose the MBID Input Source

[cite_start]The `poller.pl` script supports three different ways to provide MBIDs, in order of priority[cite: 5, 6]:

| Environment Variable | Priority | Description |
| :--- | :--- | :--- |
| `MBID_API_URL` | **1st** (Highest) | A URL that returns a JSON array of objects, each containing a `foreignId` field. |
| `MBID_JSON_FILE` | **2nd** | A path to a local JSON file (like `ids.json`) containing the MBID array. |
| `MBID_URL` | **3rd** (Lowest) | A single MusicBrainz URL or ID to process. |

[cite_start]In your `docker-compose.yaml`, **only one** of these should be uncommented and set[cite: 5, 6, 7].

#### A. Using a JSON File (Recommended for simple setups)

1.  [cite_start]Place your list of IDs in an `ids.json` file in the project directory (or adjust the volume mount)[cite: 7].
2.  In `docker-compose.yaml`, **comment out** `MBID_API_URL` and **uncomment** `MBID_JSON_FILE`:

    ```yaml
    # ... mbid-poller environment section
    environment:
      # ...
      - LIDARR_BASE=http://lidarr:8686
      # - MBID_API_URL= 
      - MBID_JSON_FILE=/config/ids.json
      # - MBID_URL=... 
    volumes:
      - ./ids.json:/config/ids.json:ro # Maps your local file into the container
    ```

### 4. Build and Run

With your files and `docker-compose.yaml` configured, you can build and run the poller.

1.  [cite_start]**Build the Container:** This compiles the Perl dependencies using the `Dockerfile`[cite: 1, 2, 3].

    ```bash
    docker compose build mbid-poller
    ```

2.  [cite_start]**Run the Poller:** Since the `restart` policy is set to `"no"`[cite: 7], this command will run the script once and exit.

    ```bash
    docker compose up mbid-poller
    ```

The script will fetch the IDs, then loop through them, pinging the external MusicBrainz API until a successful response is received. It then outputs a Lidarr search URL for you to manually or automatically trigger the import in Lidarr.