Basic Go server for mbtiles
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README.md

mbtileserver Build Status Coverage Status GoDoc Go Report Card

============

A simple Go-based server for map tiles stored in mbtiles format.

Requires Go 1.8.

It currently provides support for png, jpg, and pbf (vector tile) tilesets according to version 1.0 of the mbtiles specification. Tiles are served following the XYZ tile scheme, based on the Web Mercator coordinate reference system. UTF8 Grids are also supported.

In addition to tile-level access, it provides:

  • TileJSON 2.1.0 endpoint for each tileset, with full metadata from the mbtiles file.
  • a preview map for exploring each tileset.
  • a minimal ArcGIS tile map service API (work in progress)

We have been able to host a bunch of tilesets on an AWS t2.nano virtual machine without any issues.

Goals

  • Provide a web tile API for map tiles stored in mbtiles format
  • Be fast
  • Run on small resource cloud hosted machines (limited memory & CPU)
  • Be easy to install and operate

Installation

You can install this project with

go get github.com/consbio/mbtileserver

This will create and install an executable called mbtileserver.

This uses Govendor tool, so dependencies ship with the repo for easier builds.

Dependencies:

Development Dependencies (only needed when modifying the code):

On Windows, it is necessary to install gcc in order to compile mattn/go-sqlite3.
MinGW or TDM-GCC should work fine.

If you experience very slow builds each time, it may be that you need to first run

go build -a .

to make subsequent builds much faster.

Usage

From within the repository root ($GOPATH/bin needs to be in in your $PATH):

$  mbtileserver --help
Serve tiles from mbtiles files.

Usage:
  mbtileserver [flags]

Flags:
  -c, --cert string     X.509 TLS certificate filename.  If present, will be used to enable SSL on the server.
  -d, --dir string      Directory containing mbtiles files. (default "./tilesets")
      --domain string   Domain name of this server
      --dsn string      Sentry DSN
  -h, --help            help for mbtileserver
  -k, --key string      TLS private key
      --path string     URL root path of this server (if behind a proxy)
  -p, --port int        Server port. (default 8000)
  -t, --tls				Auto TLS using Let's Encrypt
  -r, --redirect		Redirect HTTP to HTTPS
  -v, --verbose         Verbose logging

So hosting tiles is as easy as putting your mbtiles files in the tilesets directory and starting the server. Woo hoo!

You can have multiple directories in your tilesets directory; these will be converted into appropriate URLs:

mytiles/foo/bar/baz.mbtiles will be available at /services/foo/bar/baz.

When you want to remove, modify, or add new tilesets, simply restart the server process.

If a valid Sentry DSN is provided, warnings, errors, fatal errors, and panics will be reported to Sentry.

If redirect option is provided, the server also listens on port 80 and redirects to port 443.

Specifications

Creating Tiles

You can create mbtiles files using a variety of tools. We have created tiles for use with mbtileserver using:

Examples

TileJSON API for each tileset: http://localhost/services/states_outline

returns something like this;

{
  "bounds": [
    -179.23108,
    -14.601813,
    179.85968,
    71.441055
  ],
  "center": [
    0.314297,
    28.419622,
    1
  ],
  "credits": "US Census Bureau",
  "description": "States",
  "format": "png",
  "id": "states_outline",
  "legend": "[{\"elements\": [{\"label\": \"\", \"imageData\": \"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAGFJREFUOI3tlDEOgEAIBClI5kF+w0fxwXvQdjZywcZEtDI31YaQgWrdPsYzAPFGJCmmEAhJGzCash0wSVE/HHnlKcDMfrPXYgmXcAl/JswK6lCrz89BdGVm1+qrH0bbWDgA3WwmgzD8ueEAAAAASUVORK5CYII=\"}], \"name\": \"tl_2015_us_state\"}]",
  "map": "http://localhost/services/states_outline/map",
  "maxzoom": 4,
  "minzoom": 0,
  "name": "states_outline",
  "scheme": "xyz",
  "tags": "states",
  "tilejson": "2.1.0",
  "tiles": [
    "http://localhost/services/states_outline/tiles/{z}/{x}/{y}.png"
  ],
  "type": "overlay",
  "version": "1.0.0"
}

It provides most elements of the metadata table in the mbtiles file.

XYZ tile endpoint for individual tiles: http://localhost/services/states_outline/tiles/{z}/{x}/{y}.png

If UTF-8 Grid data are present in the mbtiles file, they will be served up over the grid endpoint: http://localhost/services/states_outline/tiles/{z}/{x}/{y}.json

Grids are assumed to be gzip or zlib compressed in the mbtiles file. These grids are automatically spliced with any grid key/value data if such exists in the mbtiles file.

The map endpoint: http://localhost/services/states_outline/map

provides an interactive Leaflet map for image tiles, including a few helpful plugins like a legend (if compatible legend elements found in TileJSON) and a transparency slider. Vector tiles are previewed using Mapbox GL.

ArcGIS API

This project currently provides a minimal ArcGIS tiled map service API for tiles stored in an mbtiles file. This should be sufficient for use with online platforms such as Data Basin. Because the ArcGIS API relies on a number of properties that are not commonly available within an mbtiles file, so certain aspects are stubbed out with minimal information.

This API is not intended for use with more full-featured ArcGIS applications such as ArcGIS Desktop.

Live Examples

These are hosted on a free dyno by Heroku (thanks Heroku!), so there might be a small delay when you first access these.

Roadmap

See the issues tagged to the 0.5 version for our near term features and improvements.

In short, we are planning to:

  • add tests and benchmarks
  • get things production ready

Development

Development of the templates and static assets likely requires using node and npm. Install these tools in the normal way.

From the handlers/templates/static folder, run

$npm install

to pull in the static dependencies. These are referenced in the package.json file.

Then to build the minified version, run:

$gulp build

Modifying the .go files always requires re-running go build ..

In case you have modified the templates and static assets, you need to run go generate ./handlers to ensure that your modifications are embedded into the executable. For this to work, you must have [github.com/shurcooL/vfsgen)[https://github.com/shurcooL/vfsgen) installed. This will rewrite the assets_vfsdata.go which you must commit along with your modification. Also you should run go build after go generate.

During the development cycle you may use go build -tags dev . to build the binary, in which case it will always take the assets from the relative file path handlers/templates/ directly and you can omit the go generate step. (note: this is currently not working properly) But do not forget to perform it in the end.