MCSERVER-WRAPPER
================
Minecraft server wrapper written in Python3 that extracts server status and list
of online players and more.

Requires:
-----------------
* Unix-like OS (preferred an only tested is Linux)
* Python3 (minimum version 3.3)
* Dependencies for Minecraft server (Java)

For releasing are required also Pandoc and pypandoc to convert this file.

Installation
------------
Installation is done using `pip`. Execute this command to install:
```
sudo pip install mcserver-wrapper
```
Expecting that Python3 is your default Python version, otherwise use `pip3`.

MCWRAPPER
---------
### Usage
```
mcwrapper [-h] [--verbose] [--quiet] [--status-file] [--players-file]
          ...

This script is executing Minecraft server and reads its output. From output is
extracted server status and list of online players. And standard input can be
accessed by fifo file.

positional arguments:
  command             Command to be executed to start Minecraft server.

optional arguments:
  -h, --help            show this help message and exit
  --verbose, -v         Increase verbose level of output
  --quiet, -q           Decrease verbose level of output
  --status-file, -s     Outputs server status to file "status"
  --players-file, -p    Outputs list of online players to file "players"
  --mod-file MOD_FILE, -m MOD_FILE
                        Prints periodically random line from given file as
                        message of the day.
  --mod-time MOD_TIME   Period used for message of the day in seconds. In
                        default 900 (15 minutes).
```

### How it works
Script is reading Minercraft server standard and error output. It's looking for
known lines that signals change of server status and players joining and leaving.
Minecraft server output is well designed for information parsing. Informations are
exported to directory working directory or websocket server.

#### Input pipe
This is unix pipe. This file is located in working directory and named as
`input_pipe`.  This pipe is input to Minercraft server standard input. If you have
write access rights (default 640), then you can send any command to Minecraft
server by writing to this pipe.

#### Server.pid file
This file contains PID of Minecraft server process. This is used to detect if
server is running when status files exists. It has probably no usage for user, but
shouldn't be tempered with.

#### Status file
This file is in working directory and is named as `status`. If it exists, it
specifies in what status is server in the moment.
Status can be:

* Starting
* Running
* Stopping

If file not exists, then server is not running at all.

#### Players file
This file in in status directory and is named as `players`. If server is running,
it contains online players. Player name per line.  If server isn't running, it
content don't have to be valid.

### Message of the day
This prints to players various short messages in given interval. Message is from
file passed as --mod-file and it's randomly selected line. This file is read on
wrapper start, so if you edit it while it's running, no change will happen unless
you send USR1 signal to mcwrapper server. You can use this simple script:
```
[ -f server.pid ] && kill -USR1 $(cat server.pid)
```