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App/Infoscreen for Railway Departures in Germany

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db-infoscreen - App/Infoscreen for Railway Departures in Germany
---

[db-infoscreen](https://finalrewind.org/projects/db-fakedisplay/) (formerly
db-fakedisplay) shows departures at public transit stops in most of Germany,
Switzerland, Austria, Luxembourg, Ireland, and parts of the USA. It can serve
both as infoscreen and web application for mobile usage. Depending on backend
support, it can provide details on individual departures such as a map of the
scheduled route, expected occupancy, and carriage formation.

There's a public [db-infoscreen service on
finalrewind.org](https://dbf.finalrewind.org/). You can also host your own
instance via carton/cpanminus or Docker if you like, see the Setup notes below.

Dependencies
---

* perl >= 5.20
 * carton or cpanminus
 * git
 * libc6-dev
 * libssl-dev
 * libxml2-dev
 * make
 * zlib1g-dev

Installation
---

After installing the dependencies, clone the repository using git, e.g.

```
git clone https://git.finalrewind.org/db-fakedisplay
```

Make sure that all files (including `.git`, which is used to determine the
software version) are readable by your www user, and follow the steps in the
next sections.

Perl Dependencies
---

db-infoscreen depends on a set of Perl modules which are documented in
`cpanfile`. After installing the dependencies mentioned above, you can use
carton or cpanminus to install Perl dependencies locally.

In the project root directory (where `cpanfile` resides), run either

```
carton install
```

```
cpanm --installdeps .
```

and set `PERL5LIB=.../local/lib/perl5` before running index.pl or wrap it
with `carton exec hypnotoad index.pl`.

Note that you should provide imprint and privacy policy pages. Depending on
traffic volume, you may also want to increase the amount of worker processes
and install a caching proxy in front of DBF.  See the Setup notes below.

To update your DBF installation, run `git pull`, ensure that all files are
readable by your www user, and re-run `carton install` or `cpanm --installdeps
.`.

Installation with Docker
---

A db-infoscreen image for both amd64 and arm64 is available on Docker Hub.
You can install and run it as follows:

```
docker run --rm -p 8000:8092 -v "$(pwd)/templates:/app/ext-templates:ro" derfnull/db-fakedisplay:latest
```

This will make the web service available on port 8000.
Note that you should provide an imprint and a privacy policy in the `templates/` directory; see the Setup notes below.

Use `docker run -e DBFAKEDISPLAY_WORKERS=4 ...` and similar to pass environment
variables to the db-infoscreen service.

To update your Docker installation, fetch a new image from Docker Hub and
re-start the container.

Setup
---

In hypnotoad mode (recommended), db-infoscreen respects the following environment variables:

| Variable | Default | Description |
| :------- | :------ | :---------- |
| DBFAKEDISPLAY\_LISTEN | `http://*:8092` | IP and Port for web service |
| DBFAKEDISPLAY\_STATS | _None_ | File in which the total count of backend API requests (excluding those answered from cache) is written |
| DBFAKEDISPLAY\_IRIS\_CACHE | `/tmp/dbf-iris-mian` | Directory for IRIS schedule cache |
| DBFAKEDISPLAY\_IRISRT\_CACHE | `/tmp/dbf-iris-realtime` | Directory for IRIS realtime cache |
| DBFAKEDISPLAY\_WORKERS | 2 | Number of worker processes (i.e., maximum amount of concurrent requests) |

Set these as needed, create `templates/imprint.html.ep` (imprint) and
`templates/privacy.html.ep` (privacy policy), and configure your web server to
pass requests for db-infoscreen to the appropriate port. See the
`examples` directory for imprint and privacy policy samples.

You can then use a service supervisor of your choice to run **hypnotoad index.pl**
(using Mojolicious' hypnotoad server). See `examples/db-infoscreen.service`
for a systemd unit example.

For a quick&dirty setup on low-traffic sites you can also use **morbo index.pl**
or **perl index.pl daemon -m production**. In this case, DBFAKEDISPLAY\_LISTEN
and DBFAKEDISPLAY\_WORKERS have no effect. Morbo accepts IP and port
configuration using the `-l`/`--listen` switch (default: `http://*:3000`);
Daemon mode respects the MOJO\_LISTEN environment variable (default: `http://*:3000`).

For public-facing installations, you may want to enable caching in the reverse
proxy serving DBF. See `examples/nginx-cache.conf` and
`examples/nginx-site.conf` for nginx examples.

All code in this repository may be used under the terms of the BSD-2-Clause
(db-infoscreen, see COPYING) and MIT (jquery, jqueryui, and marquee libraries;
see the respective files) licenses.  Attribution is appreciated.

Background Data Updates
---

db-infoscreen can use <https://lib.finalrewind.org/dbdb/db_zugbildung_v1.json>
to show scheduled ICE/IC types (ICE 1/2/3/4/T, IC 1/2), wagon orders, and other
attributes. It expects the file to be provided in `share/zugbildungsplan.json`.

As this information is updated regularly, the file is not shipped as part of
this db-infoscreen distribution. It is recommended to retrieve it a few minutes
after midnight via a daily cronjob. See `examples/dbf_update_zugbildungsplan`
for a shell script.

DBF will periodically reload `share/zugbildungsplan.json`. You can use your
service supervisor (e.g. `systemctl reload db-infoscreen`) to force an
immediate reload. You may also ignore the file; it is entirely optional.

System requirements
---

Resource requirements depend on usage. For a few requests per second, about
200MB (600k inodes) cache and one or two CPU cores should be sufficient.
db-infoscreen typically needs 50MB RAM per worker process, though calculating
with 100MB per worker is recommended to leave a safety margin.

Licensing
---

This project follows the REUSE specification. The copyright of individual files
is documented in the file's header or in .reuse/dep5. The referenced licenses
are stored in the LICENSES directory.

The program code of db-infoscreen is licensed under the terms of the GNU AGPL
v3. HTML Templates and SASS/CSS layout are licensed under the terms of the
2-Clause BSD License. This means that you are free to host your own
db-infoscreen instance, both for personal/internal and public use, under the
following conditions.

* You are free to change HTML/SASS/CSS templates as you see fit (though you
  must not remove the copyright headers).
* If you make changes to the program code, that is, a file below lib/ or a
  db-infoscreen javascript file below public/static/js/, you must make those
  changes available to the public.

The easiest way of making changes available is by maintaining a public fork of
the Git repository. A tarball is also acceptable. Please change `source_url` in
`lib/DBInfoscreen.pm` to point to your Git repository / source archive if you
are using a version with custom changes.

Resources
---

Mirrors of the db-infoscreen repository are available at

* [Codeberg](https://codeberg.org/derf/db-infoscreen)
* [Finalrewind](https://git.finalrewind.org/derf/db-infoscreen)
* [GitHub](https://github.com/derf/db-fakedisplay)

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