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221 lines
7.3 KiB
Markdown
Executable File
221 lines
7.3 KiB
Markdown
Executable File
# Martin
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[](https://circleci.com/gh/urbica/martin)
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Martin is a [PostGIS](https://github.com/postgis/postgis) [vector tiles](https://github.com/mapbox/vector-tile-spec) server suitable for large databases. Martin is written in [Rust](https://github.com/rust-lang/rust) using [Actix](https://github.com/actix/actix-web) web framework.
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## Installation
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You can download martin from [Github releases page](https://github.com/urbica/martin/releases).
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If you are using macOS and [Homebrew](https://brew.sh/) you can install martin using Homebrew tap.
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```shell
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brew tap urbica/tap
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brew install martin
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```
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## Usage
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Martin requires a database connection string. It can be passed as a command-line argument or as a `DATABASE_URL` environment variable.
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```shell
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martin postgres://postgres@localhost/db
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```
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## Table Sources
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Table Source is a database table which can be used to query [vector tiles](https://github.com/mapbox/vector-tile-spec). When started, martin will go through all spatial tables in the database and build a list of table sources. A table should have at least one geometry column with non-zero SRID. All other table columns will be represented as properties of a vector tile feature.
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### Table Sources List
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Table Sources list endpoint is available at `/index.json`
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```shell
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curl localhost:3000/index.json
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```
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### Table Source TileJSON
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Table Source [TileJSON](https://github.com/mapbox/tilejson-spec) endpoint is available at `/{schema_name}.{table_name}.json`.
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For example, `points` table in `public` schema will be available at `/public.points.json`
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```shell
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curl localhost:3000/public.points.json
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```
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### Table Source tiles
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Table Source tiles endpoint is available at `/{schema_name}.{table_name}/{z}/{x}/{y}.pbf`
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For example, `points` table in `public` schema will be available at `/public.points/{z}/{x}/{y}.pbf`
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```shell
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curl localhost:3000/public.points/0/0/0.pbf
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```
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## Function Sources
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Function Source is a database function which can be used to query [vector tiles](https://github.com/mapbox/vector-tile-spec). When started, martin will look for the functions with a suitable signature. A function that takes `z integer`, `x integer`, `y integer`, and `query_params json` and returns `bytea`, can be used as a Function Source.
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| Argument | Type | Description |
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| ------------ | ------- | ----------------------- |
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| z | integer | Tile zoom parameter |
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| x | integer | Tile x parameter |
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| y | integer | Tile y parameter |
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| query_params | json | Query string parameters |
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**Hint**: You may want to use [TileBBox](https://github.com/mapbox/postgis-vt-util#tilebbox) function to generate bounding-box geometry of the area covered by a tile.
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Here is an example of a function that can be used as a Function Source.
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```plsql
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CREATE OR REPLACE FUNCTION public.function_source(z integer, x integer, y integer, query_params json) RETURNS bytea AS $$
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DECLARE
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bounds geometry;
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mvt bytea;
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BEGIN
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SELECT INTO bounds TileBBox(z, x, y, 3857);
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SELECT INTO mvt ST_AsMVT(tile, 'public.function_source', 4096, 'geom') FROM (
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SELECT
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ST_AsMVTGeom(geom, bounds, 4096, 64, true) AS geom
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FROM public.table_source
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WHERE geom && bounds
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) as tile WHERE geom IS NOT NULL;
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RETURN mvt;
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END
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$$ LANGUAGE plpgsql IMMUTABLE STRICT PARALLEL SAFE;
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```
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### Function Sources List
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Function Sources list endpoint is available at `/rpc/index.json`
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```shell
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curl localhost:3000/rpc/index.json
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```
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### Function Source TileJSON
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Function Source [TileJSON](https://github.com/mapbox/tilejson-spec) endpoint is available at `/rpc/{schema_name}.{function_name}.json`
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For example, `points` function in `public` schema will be available at `/rpc/public.points.json`
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```shell
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curl localhost:3000/rpc/public.points.json
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```
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### Function Source Tiles
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Function Source tiles endpoint is available at `/rpc/{schema_name}.{function_name}/{z}/{x}/{y}.pbf`
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For example, `points` function in `public` schema will be available at `/rpc/public.points/{z}/{x}/{y}.pbf`
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```shell
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curl localhost:3000/rpc/public.points/0/0/0.pbf
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```
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## Configuration File
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If you don't want to expose all of your tables and functions, you can list your sources in a configuration file. To start martin with a configuration file you need to pass a file name with a `--config` argument.
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```shell
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martin --config config.yaml
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```
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You can find an example of a configuration file [here](https://github.com/urbica/martin/blob/master/tests/config.yaml).
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## Using Martin with Mapbox GL JS
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[Mapbox GL JS](https://github.com/mapbox/mapbox-gl-js) is a JavaScript library for interactive, customizable vector maps on the web. It takes map styles that conform to the
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[Mapbox Style Specification](https://www.mapbox.com/mapbox-gl-js/style-spec), applies them to vector tiles that
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conform to the [Mapbox Vector Tile Specification](https://github.com/mapbox/vector-tile-spec), and renders them using
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WebGL.
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You can add a layer to the map and specify martin TileJSON endpoint as a vector source URL. You should also specify a `source-layer` property. For Table Sources it is `{schema_name}.{table_name}` by default.
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```js
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map.addLayer({
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id: "public.points",
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type: "circle",
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source: {
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type: "vector",
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url: "http://localhost:3000/public.points.json"
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},
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"source-layer": "public.points"
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});
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```
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## Command-line Interface
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You can configure martin using command-line interface
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```shell
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Usage:
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martin [options] [<connection>]
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martin -h | --help
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martin -v | --version
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Options:
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-h --help Show this screen.
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-v --version Show version.
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--workers=<n> Number of web server workers.
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--pool_size=<n> Maximum connections pool size [default: 20].
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--keep_alive=<n> Connection keep alive timeout [default: 75].
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--listen_addresses=<n> The socket address to bind [default: 0.0.0.0:3000].
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--config=<path> Path to config file.
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```
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## Environment Variables
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You can also configure martin using environment variables
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| Environment variable | Example | Description |
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| -------------------- | -------------------------------- | ----------------------------- |
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| DATABASE_URL | postgres://postgres@localhost/db | postgres database connection |
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| DATABASE_POOL_SIZE | 20 | maximum connections pool size |
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| WORKER_PROCESSES | 8 | number of web server workers |
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| KEEP_ALIVE | 75 | connection keep alive timeout |
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## Using with Docker
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You can use official Docker image `urbica/martin`
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```shell
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docker run \
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-p 3000:3000 \
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-e DATABASE_URL=postgres://postgres@localhost/db \
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urbica/martin
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```
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## Building from Source
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You can clone the repository and build martin using [cargo](https://doc.rust-lang.org/cargo) package manager.
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```shell
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git clone git@github.com:urbica/martin.git
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cd martin
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cargo build --release
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```
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The binary will be available at `./target/release/martin`.
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```shell
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cd ./target/release/
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./martin postgres://postgres@localhost/db
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```
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## Development
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Install project dependencies and check if all the tests are running.
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```shell
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cargo test
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cargo run
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```
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