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doc: update README.md

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Stepan Kuzmin 2018-10-20 12:24:28 +03:00
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# Martin # Martin
![CircleCI](https://img.shields.io/circleci/project/github/urbica/martin.svg?style=popout) [![CircleCI](https://img.shields.io/circleci/project/github/urbica/martin.svg?style=popout)](https://circleci.com/gh/urbica/martin)
Martin is a [PostGIS](https://github.com/postgis/postgis) [Mapbox 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. 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.
![Martin](https://raw.githubusercontent.com/urbica/martin/master/mart.png) ![Martin](https://raw.githubusercontent.com/urbica/martin/master/mart.png)
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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. 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.
| Argument | Type | Description | | Argument | Type | Description |
|--------------|---------|-------------------------| | ------------ | ------- | ----------------------- |
| z | integer | Tile zoom parameter | | z | integer | Tile zoom parameter |
| x | integer | Tile x parameter | | x | integer | Tile x parameter |
| y | integer | Tile y parameter | | y | integer | Tile y parameter |
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```js ```js
map.addLayer({ map.addLayer({
"id": "public.points", id: "public.points",
"type": "circle", type: "circle",
"source": { source: {
"type": "vector", type: "vector",
"url": "http://localhost:3000/public.points.json", url: "http://localhost:3000/public.points.json"
}, },
"source-layer": "public.points" "source-layer": "public.points"
}); });
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You can also configure martin using environment variables You can also configure martin using environment variables
| Environment variable | Example | Description | | Environment variable | Example | Description |
|----------------------|----------------------------------|-------------------------------| | -------------------- | -------------------------------- | ----------------------------- |
| DATABASE_URL | postgres://postgres@localhost/db | postgres database connection | | DATABASE_URL | postgres://postgres@localhost/db | postgres database connection |
| DATABASE_POOL_SIZE | 20 | maximum connections pool size | | DATABASE_POOL_SIZE | 20 | maximum connections pool size |
| WORKER_PROCESSES | 8 | number of web server workers | | WORKER_PROCESSES | 8 | number of web server workers |