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https://bitbucket.org/s_l_teichmann/mtsatellite
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197 lines
10 KiB
Markdown
197 lines
10 KiB
Markdown
# SETUP MTSatellite
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You will need a Minetest server with Redis support compiled in. Consult the Minetest documentation to figure out how to get such build.
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Furthermore you need the binaries `mtdbconverter`, `mtseeder`, `mtredisalize` and `mtwebmapper` in your **PATH**.
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Consult [COMPILE](https://bitbucket.org/s_l_teichmann/mtsatellite/src/default/COMPILE.md) how to build these.
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Setting up MTSatellite takes six steps:
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1. [Backup your world](#markdown-header-backup-your-world)
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2. [Convert world database into interleaved format](#markdown-header-convert-world-database-into-interleaved-format)
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3. [Start `mtredisalize`](#markdown-header-start-mtredisalize)
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4. [Pre-compute the map tiles with `mtseeder`](#markdown-header-pre-compute-the-map-tiles-with-mtseeder)
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5. [Start the web server `mtwebmapper`](#markdown-header-start-the-web-server-mtwebmapper)
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6. [Configure and restart the Minetest server](#markdown-header-configure-and-restart-the-minetest-server)
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Experimental: Optionally you can [enable on map tracking of logged in players](#markdown-header-enable-on-map-tracking-of-logged-in-players).
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## Backup your world
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Stop your running Minetest server and make a backup of your world
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before you will start crying.
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## Convert world database into interleaved format
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MTSatellite operates best if the block data of the world is stored in a LevelDB database with
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a key scheme called interleaved. With this key scheme you can pick up sets of neighbored blocks a
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lot quicker than with a plain database.
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See [Z-order curve](http://en.wikipedia.org/wiki/Z-order_curve) at Wikipedia to grasp the core ideas.
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MTSatellite can run on plain LevelDB or SQLite3 world databases but with slightly reduced performance.
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This should work but to our knowledge it is not used in productive setups.
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Stay with the interleaved format!
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To convert your original plain SQLite3 or LevelDB database (Redis is not supported atm) to the interleaved
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LevelDB format you have to use `mtdbconverter`:
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mtdbconverter -source-backend=sqlite /path/to/your/world/map.sqlite /path/to/your/world/map.db
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Depending on the size of your world and the speed of your computer system this conversion will take some time.
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Change `-source-backend=sqlite` to `-source-backend=leveldb` if your world is stored as a LevelDB.
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`mtdbconverter` can also be used to convert your world back to the plain key scheme.
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Use `mtdbconverter --help` to see all options.
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You can skip the conversion if you want to use a plain database.
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## Start mtredisalize
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`mtredisalize` is the component which serves the block data to Minetest and `mtwebmapper` as a Redis
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look-alike server. Start it with:
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mtredisalize \
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-host=localhost \
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-interleaved=true \
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-change-url=http://localhost:8808/update \
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-change-duration=10s \
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/path/to/your/world/map.db
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This binds the server to localhost port 6379 the default Redis port. You can shange it with the `-port=` option.
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The `-interleaved=true` option is **mandatory** if you use the interleaved format of the database. Forgetting it
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will end up in the crying mentioned above. Set this flag to `false` if you are using a plain database.
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The `-change-url=` option is a forward reference to the `mtwebmapper` server which will be notified if the
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world has changed. If it is not configured the tile re-generation is not triggered. As long as the Minetest server
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is down there will be no changes and therefore it is safe to configure it even if the `mtwebmapper` service is not
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running.
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The `-change-duration=` option specifies the amount of time how long the `mtredisalize` server should aggregate
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changes made to the world before reporting them to `mtwebmapper`. It defaults to 30 seconds but the value can
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be increased or decreased depending how often you want to update the map. Decreasing it will increase the
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computing pressure on your system so configure it wisely.
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## Pre-compute the map tiles with mtseeder
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Even in a dynamical Mintest world played with many players most of the data is static over time. To generate
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a basic map to apply only changes to use `mtseeder`:
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GOMAXPROCS=6 mtseeder \
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-colors=/path/to/your/colors.txt \
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-output-dir=/path/to/your/map \
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-workers=3
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This contacts the `mtredisalize` server running at localhost port 6379 to fetch the block data from. You will
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need a `colors.txt` to map the block nodes to pixel colors of your map. The repository contains a
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[prefabricated](https://bitbucket.org/s_l_teichmann/mtsatellite/raw/default/colors.txt) or you can create
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an adjusted one fitting your server with [mtautocolors](https://bitbucket.org/s_l_teichmann/mtautocolors).
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If you want to have certain nodes to be transparent you can add `-transparent=true` to the
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options. In this case if a color from colors.txt does have a forth color component the numerical
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value between 0 (fully transparent) and 255 (fully opaque) will be the base transparency of the
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pixel. Every depth meter of the same material will reduce the transparency by 2%. This can be adjusted
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with the `-transparent-dim=percent` flags.
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See `mtseeder --help` for all options.
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The `-workers=` option and the `GOMAXPROCS=` environment variable are completely optional but very useful
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to exploit multiple processor cores on your machine. Set `GOMAXPROCS=` to the result of `nproc` and `-workers=`
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to a number a little lesser. You have to experiment with this to find a good setting.
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Even with good CPU usage generating the map and overview image tiles take a while.
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Tip: A lot of the Minetest map tiles are white/empty but are saved as dupes in the file system. To
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deduplicate them you can use e.g. [hardlink](https://bitbucket.org/s_l_teichmann/hardlink). You
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can also run it as a nightly cron job to dedupe the map on a regular basis.
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## Start the web server mtwebmapper
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This web server serves the Leaflet compatibles to the browser and is contacted by `mtredisalize`
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if something in the world has changed. In this case the corresponding map tiles are re-generated
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in the background. To start `mtwebmapper` use:
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GOMAXPROCS=3 mtwebmapper \
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-colors=/path/to/your/colors.txt \
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-web-host="" \
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-map=/path/to/your/map \
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-web=/path/to/your/static/web \
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-redis-host=localhost \
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-workers=2 \
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-websockets=false
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For the `colors=` options applys the same as said above. You can also add
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`-transparent=true` for transparency as mentioned above. The `web-host=` is the interface the
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server ist listening on. `""` means all interfaces. The port defaults to 8808.
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For a productive setup you may consider running it behind a reverse proxy.
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`-map=` has to be the same path as used by `mtseeder`.
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`-web=` is the path to the static web data (Leaflet, HTML, CSS, etc.). You can take it
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from the [repository](https://bitbucket.org/s_l_teichmann/mtsatellite/src/default/cmd/mtwebmapper/web/)
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To fetch the block data from the `mtredisalize` you have to use the option `redis-host=`. If
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you omit this then there will be no background job to re-generate the map. This is useful
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if you want to serve a map that is only generated once whith `mtseeder`.
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To see all the available options use `mtwebmapper --help`.
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The `GOMAXPROCS=`/`-workers=` setting has to be adjusted to your system capacity. Do not
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give to much ressources to this if you planning to run the mapping webserver on the
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same machine as the Minetest server. On the other hand assigning more cores to it definitely
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helps to boost up the performance.
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Setting the `-websockets=true` flag enables websocket support for the server. With this
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feature turned on and changing the line (in `web/index.html`) from
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var useWebsocket = false; // Set to true if you want websocket support
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to
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var useWebsocket = true; // Set to true if you want websocket support
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the web client gets an extra 'auto update' button. When switched on the server
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informs the client if something in the maps has changed. The displayed map will
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then update automatically without the need of manual pressing the 'update view'
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button. Of cause your browser needs Websocket support, too.
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## Configure and restart the Minetest server
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Now everything is in place and the only thing left ist to re-configure the Minetest server
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itself. You have to open your `/path/to/your/world.mt` file in your text editor and replace the
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backend with a Redis configuration:
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backend = redis
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redis_hash = IGNORED
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redis_address = localhost
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You may have to set `redis_port` too if you run `mtredisalize` not on port 6379.
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Now we are all done and you can fire your Minetest server up again. :-)
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## Enable on map tracking of logged in players
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MTSatellite can display logged in players on the map.
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This is an experimental feature and its only confirmed working on GNU/Linux systems.
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OS X and \*BSD should work, too.
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To use it install the [track_players](https://bitbucket.org/s_l_teichmann/mtsatellite/src/default/mods/track_players)
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mod. Simple add a checkout to your mods folder and activate it in your world.mt file.
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...
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load_mod_track_players = true
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...
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This minetest mod writes players position to a [named pipe aka FIFO](http://en.wikipedia.org/wiki/Named_pipe).
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`mtwebmapper` is able to read from this file and serve these positions as GeoJSON to the browser.
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The FIFO has to be created _before_ the start of the minetest server.
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$ mkfifo /tmp/mt_players_fifo
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The path to the FIFO can be changed in track_players/init.lua
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...
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local fifo_path = "/tmp/mt_players_fifo"
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...
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To use the feature in `mtwebmapper` add the argument `-players=/tmp/mt_players_fifo` to the list
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of command line arguments.
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*Caution*: Please start `mtwebmapper` before the minetest server! Caused by the nature of FIFOs and the
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single threaded execution of minetest mods the minetest server will block if there is no consumer
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reading the player positions.
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The player tracking is well integrated with the websocket support. If you enable websockets you will
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be able to see the players moving on the map.
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