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chiitiler - The Tiny MapLibre Server

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generated by DALL-E

chii-tiler: "tiny" in Japanese is "chiisai", shorten into "chii"

motivation

In this type of server, there is a de-facto - maptiler/tileserver-gl, but this is too big for me.
I want a server accept style.json-url and respond raster tile, inspired by developmentseed/titiler

features

/tiles

chiitiler provides you with an endpoint /tiles. Once server launched, you can use the endpoint like this:

http://localhost:3000/tiles/0/0/0.png?url=https://tile.openstreetmap.jp/styles/osm-bright/style.json
http://localhost:3000/tiles/0/0/0.webp?margin=100&url=https://tile.openstreetmap.jp/styles/maptiler-toner-en/style.json
http://localhost:3000/tiles/1/1/1.jpg?tileSize=256&quality=80&url=https://tile.openstreetmap.jp/styles/osm-bright/style.json

/clip.png|webp|jpg|jpeg

chiitiler provides you with /clip.png|webp|jpg|jpeg endpoint. Once server launched, you can use like this:

# default size is 1024, this is longer axis and shorter axis is calculated by aspect ratio
http://localhost:3000/clip.png?bbox=100,30,150,60&url=https://path/to/style.json
# specify size
http://localhost:3000/clip.png?bbox=100,30,150,6&size=512&url=https://path/to/style.json
# specify quality
http://localhost:3000/clip.png?bbox=100,30,150,6&size=512&quality=80&url=https://path/to/style.json

POST endpoint

Each endpoint also supports POST method. You can pass style.json as a body. (then, url parameter is not needed)

architecture

graph LR
    subgraph sources
        direction LR
        A[style.json]
        z/x/y.pbf
        z/x/y.png/webp/jpg
        sprite
        glyphs
    end

    subgraph chiitiler
        cache
        render
        server
    end

sources --> cache --> render --> server --/tiles/z/x/y--> png/webp/jpg

cache <--get/set--> memory/file/S3

usage

Container Image

docker pull ghcr.io/kanahiro/chiitiler
docker run -p 3000:3000 ghcr.io/kanahiro/chiitiler # -> tile-server

# recommended: you can use environment variables
docker run -p 3000:3000 -d \
-e CHIITILER_CACHE_METHOD=s3 \
-e CHIITILER_S3CACHE_BUCKET=bucketname \
-e CHIITILER_S3_REGION=ap-northeast-1 \
ghcr.io/kanahiro/chiitiler

# you also can pass options
docker run -p 8000:8000 ghcr.io/kanahiro/chiitiler tile-server -p 8000 -c s3 -s3b bucketname -s3r ap-northeast-1

Environment Variables

you can pass server options via environment variables

env var	default	description
CHIITILER_PORT	3000	port number
CHIITILER_PROCESSES	1	num of chiitiler processes. 0 means all-CPUs
CHIITILER_DEBUG	false	debug mode
CHIITILER_STREAM_MODE	false	stream mode
CHIITILER_CACHE_METHOD	none	cache method, `none`, `memory`, `file` or `s3`
CHIITILER_CACHE_TTL_SEC	3600	cache ttl, effect to `memory` and `file`
CHIITILER_MEMORYCACHE_MAXITEMCOUNT	1000	max items for memorycache
CHIITILER_FILECACHE_DIR	.cache	filecache directory
CHIITILER_S3CACHE_BUCKET		s3cache bucket name
CHIITILER_S3_REGION	us-east1	s3 bucket region for caching/fetching
CHIITILER_S3_ENDPOINT		s3 endpoint for caching/fetching
CHIITILER_S3_FORCE_PATH_STYLE	false	force path style for s3, needed for minio

CLI (deprecated)

Node.js v18 or v20

npm install
npm run build
node dist/main.js tile-server
# running server: http://localhost:3000

# develop
npm run dev
# running server: http://localhost:3000
# debug page: http://localhost:3000/debug

options

node dist/main.js tile-server -p 8000 -c file -ctl 60 -fcd cachedir -D
# -p: port number
# -c: cache method
# -ctl: cache ttl
# -fcd: cache directory
# -D: debug mode

node dist/main.js tile-server -c memory -ctl 60 -mci 1000
# -mci: max cache items

node dist/main.js tile-server -c s3 -s3b chiitiler -s3r ap-northeast-1
# -s3b: S3 bucket name for cache
# -s3r: S3 bucket region
# caution: TTL is not supported in S3 cache, please utilize S3 lifecycle policy

debug page

in debug mode, you can access:
- debug page: http://localhost:3000/debug
  - You can pass style.json url: http://localhost:3000/debug?url=https://tile.openstreetmap.jp/styles/osm-bright/style.json
- editor page: http://localhost:3000/editor

supported protocols in style.json

http:// or https:// protocol are used in Style Specification
In addition, chiitiler supports following protocols:
- s3:// for S3 bucket
- file:// for file system
- mbtiles:// for MBTIles files
- pmtiles:// for PMTiles, remote or local or s3
- cog:// experimental, for Cloud Optimized GeoTIFF. CRS must be EPSG:3857.
Only when http:// and https:// chiitiler cache them with a method you specified.

example

./localdata/style.json

{
  "version": "8",
  "sources": {
    "dir": {
      "type": "vector",
      "tiles": [
        "file://localdata/tiles/{z}/{x}/{y}.pbf"
      ],
      "maxzoom": 6
    },
    "mbtiles": {
      "type": "vector",
      "tiles": [
        "mbtiles://localdata/school.mbtiles/{z}/{x}/{y}"
      ],
      "maxzoom": 10
    },
    "pmtiles": {
      "type": "vector",
      "tiles": [
        "pmtiles://localdata/school.pmtiles/{z}/{x}/{y}"
      ],
      "maxzoom": 10
    },
    "s3": {
      "type": "vector",
      "tiles": [
        "s3://tiles/{z}/{x}/{y}.pbf"
      ],
      "maxzoom": 6
    },
    "cog": {
      "type": "raster",
      "tiles": [
        "cog://https://sentinel-cogs.s3.us-west-2.amazonaws.com/sentinel-s2-l2a-cogs/54/T/WN/2024/9/S2A_54TWN_20240908_0_L2A/TCI.tif/{z}/{x}/{y}"
      ],
      "tileSize": 256
    }
  },
  "layers": [
    {
      "id": "dir",
      "source": "dir",
      "source-layer": "P2921",
      "type": "circle",
      "paint": {
        "circle-radius": 10,
        "circle-color": "red"
      }
    },
    {
      "id": "mbtiles",
      "source": "mbtiles",
      "source-layer": "P2921",
      "type": "circle",
      "paint": {
        "circle-radius": 7,
        "circle-color": "blue"
      }
    },
    {
      "id": "pmtiles",
      "source": "pmtiles",
      "source-layer": "P2921",
      "type": "circle",
      "paint": {
        "circle-radius": 5,
        "circle-color": "yellow"
      }
    },
    {
      "id": "s3",
      "source": "s3",
      "source-layer": "P2921",
      "type": "circle",
      "paint": {
        "circle-radius": 3,
        "circle-color": "green"
      }
    },
    {
      "id": "cog",
      "source": "cog",
      "type": "raster",
      "paint": {
        "raster-opacity": 0.5
      }
    }
  ]
}

Library Mode

chiitiler can be used as a library to render MapLibre Style.
methods to render MapLibre Style are exposed from chiitiler package.

installation

npm install chiitiler

chiitiler requires some dependencies in runtime, you can find them in Dockerfile

Usage

import {
    getRenderedBboxBuffer,
    getRenderedTileBuffer,
    ChiitilerCache
} from 'chiitiler';

const s3Cache = ChiitilerCache.s3Cache({
    bucket: 'chiitiler',
    region: 'ap-northeast-1',
    endpoint: null,
});
// credentials are loaded from environment variables: AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY

const tileBuf = await getRenderedTileBuffer({
    stylejson: 'https://example.com/style.json', // or StyleSpecification object
    z: 0,
    x: 0,
    y: 0,
    tileSize: 512,
    ext: 'webp', // png, webp, jpg
    cache: s3Cache,
    quality: 80,
    margin: 0,
});

const bboxBuf = await getRenderedBboxBuffer({
    stylejson: 'file://path/to/style.json', // or StyleSpecification object
    bbox: [123.4, 34.5, 124.5, 35.6],
    size: 1024,
    cache: s3Cache,
    ext: 'webp',
    quality: 80,
});

// return value is Buffer - binary of each image

development

run docker compose up