parts:
  coverages:
    extent: &coverage-extent
      datasource: extent.geojson
      srs: 'EPSG:4326'
    world: &coverage-world
      bbox: [-180, -90, 180, 90]
      srs: 'EPSG:4326'
    world_except_extent: &coverage-world-except
      difference:
        - *coverage-world
        - *coverage-extent

globals:
  image:
    resampling_method: bilinear
    paletted: true
  cache:
    meta_size: [4, 4]

grids:
  webmercator:
    srs: 'EPSG:3857'
    origin: nw
    min_res: 156543.03392804097
  webmercator_x1:
    srs: 'EPSG:3857'
    origin: nw
    min_res: 156543.03392804097
  webmercator_x2:
    srs: 'EPSG:3857'
    origin: nw
    min_res: 78271.51696402048
    tile_size: [512,512]

sources:
  osm_source:
    type: tile
    url: http://tile.openstreetmap.org/%(z)s/%(x)s/%(y)s.png
    concurrent_requests: 4
    grid: webmercator
    max_res: 2445.98490512564
    coverage: *coverage-world-except
    on_error:
      204:
        response: transparent
        cache: True
      other:
        response: '#ff0000'
        cache: False
  mapnik_pl_x1_source:
    type: mapnik
    mapfile: ../carto/mapnik.xml
    concurrent_requests: 1
    coverage: *coverage-extent
  mapnik_pl_x2_source:
    type: mapnik
    mapfile: ../carto/mapnik.xml
    scale_factor: 2
    concurrent_requests: 1
    coverage: *coverage-extent

caches:
  osm_cache:
    sources: [osm_source]
    grids: [webmercator]
  mapnik_x1_cache:
    sources: [mapnik_pl_x1_source]
    grids: [webmercator_x1]
  mapnik_x2_cache:
    sources: [mapnik_pl_x2_source]
    grids: [webmercator_x2]

layers:
  - name: osm
    title: OpenStreetMap
    sources: [osm_cache]
  - name: mapnik_x1
    title: OpenStreetMap Extent
    sources: [mapnik_x1_cache]
  - name: mapnik_x2
    title: OpenStreetMap Extent
    sources: [mapnik_x2_cache]

services:
  tms:
    use_grid_names: true