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maps.go
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maps.go
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package register
import (
"fmt"
"html"
"strings"
"github.com/go-spatial/geom"
"github.com/go-spatial/tegola"
"github.com/go-spatial/tegola/atlas"
"github.com/go-spatial/tegola/config"
"github.com/go-spatial/tegola/provider"
)
type ErrProviderLayerInvalid struct {
ProviderLayer string
Map string
}
func (e ErrProviderLayerInvalid) Error() string {
return fmt.Sprintf("invalid provider layer (%v) for map (%v)", e.ProviderLayer, e.Map)
}
type ErrProviderNotFound struct {
Provider string
}
func (e ErrProviderNotFound) Error() string {
return fmt.Sprintf("provider (%v) not defined", e.Provider)
}
type ErrProviderLayerNotRegistered struct {
MapName string
ProviderLayer string
Provider string
}
func (e ErrProviderLayerNotRegistered) Error() string {
return fmt.Sprintf("map (%v) 'provider_layer' (%v) is not registered with provider (%v)", e.MapName, e.ProviderLayer, e.Provider)
}
type ErrFetchingLayerInfo struct {
Provider string
}
func (e ErrFetchingLayerInfo) Error() string {
return fmt.Sprintf("error fetching layer info from provider (%v)", e.Provider)
}
type ErrDefaultTagsInvalid struct {
ProviderLayer string
}
func (e ErrDefaultTagsInvalid) Error() string {
return fmt.Sprintf("'default_tags' for 'provider_layer' (%v) should be a TOML table", e.ProviderLayer)
}
// Maps registers maps with with atlas
func Maps(a *atlas.Atlas, maps []config.Map, providers map[string]provider.Tiler) error {
// iterate our maps
for _, m := range maps {
newMap := atlas.NewWebMercatorMap(string(m.Name))
newMap.Attribution = html.EscapeString(string(m.Attribution))
// convert from env package
centerArr := [3]float64{}
for i, v := range m.Center {
centerArr[i] = float64(v)
}
newMap.Center = centerArr
if len(m.Bounds) == 4 {
newMap.Bounds = geom.NewExtent(
[2]float64{float64(m.Bounds[0]), float64(m.Bounds[1])},
[2]float64{float64(m.Bounds[2]), float64(m.Bounds[3])},
)
}
if m.TileBuffer == nil {
newMap.TileBuffer = tegola.DefaultTileBuffer
} else {
newMap.TileBuffer = uint64(*m.TileBuffer)
}
// iterate our layers
for _, l := range m.Layers {
// split our provider name (provider.layer) into [provider,layer]
providerLayer := strings.Split(string(l.ProviderLayer), ".")
// we're expecting two params in the provider layer definition
if len(providerLayer) != 2 {
return ErrProviderLayerInvalid{
ProviderLayer: string(l.ProviderLayer),
Map: string(m.Name),
}
}
// lookup our proivder
provider, ok := providers[providerLayer[0]]
if !ok {
return ErrProviderNotFound{providerLayer[0]}
}
// read the provider's layer names
layerInfos, err := provider.Layers()
if err != nil {
return ErrFetchingLayerInfo{
Provider: providerLayer[0],
}
}
// confirm our providerLayer name is registered
var found bool
var layerGeomType tegola.Geometry
for i := range layerInfos {
if layerInfos[i].Name() == providerLayer[1] {
found = true
// read the layerGeomType
layerGeomType = layerInfos[i].GeomType()
break
}
}
if !found {
return ErrProviderLayerNotRegistered{
MapName: string(m.Name),
ProviderLayer: string(l.ProviderLayer),
Provider: providerLayer[0],
}
}
var defaultTags map[string]interface{}
if l.DefaultTags != nil {
var ok bool
defaultTags, ok = l.DefaultTags.(map[string]interface{})
if !ok {
return ErrDefaultTagsInvalid{
ProviderLayer: string(l.ProviderLayer),
}
}
}
var minZoom uint
if l.MinZoom != nil {
minZoom = uint(*l.MinZoom)
}
var maxZoom uint
if l.MaxZoom != nil {
maxZoom = uint(*l.MaxZoom)
}
// add our layer to our layers slice
newMap.Layers = append(newMap.Layers, atlas.Layer{
Name: string(l.Name),
ProviderLayerName: providerLayer[1],
MinZoom: minZoom,
MaxZoom: maxZoom,
Provider: provider,
DefaultTags: defaultTags,
GeomType: layerGeomType,
DontSimplify: bool(l.DontSimplify),
DontClip: bool(l.DontClip),
})
}
a.AddMap(newMap)
}
return nil
}