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geocoder.go
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/
geocoder.go
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package cached
import (
"fmt"
"github.com/codingsince1985/geo-golang"
"github.com/patrickmn/go-cache"
)
type cachedGeocoder struct {
Geocoder geo.Geocoder
Cache *cache.Cache
}
// Geocoder creates a chain of Geocoders to lookup address and fallback on
func Geocoder(geocoder geo.Geocoder, cache *cache.Cache) geo.Geocoder {
return cachedGeocoder{Geocoder: geocoder, Cache: cache}
}
// Geocode returns location for address
func (c cachedGeocoder) Geocode(address string) (*geo.Location, error) {
// Check if we've cached this response
if cachedLoc, found := c.Cache.Get(address); found {
return cachedLoc.(*geo.Location), nil
}
if loc, err := c.Geocoder.Geocode(address); err != nil {
return loc, err
} else {
c.Cache.Set(address, loc, 0)
return loc, nil
}
}
// ReverseGeocode returns address for location
func (c cachedGeocoder) ReverseGeocode(lat, lng float64) (*geo.Address, error) {
// Check if we've cached this response
locKey := fmt.Sprintf("geo.Location{%f,%f}", lat, lng)
if cachedAddr, found := c.Cache.Get(locKey); found {
return cachedAddr.(*geo.Address), nil
}
if addr, err := c.Geocoder.ReverseGeocode(lat, lng); err != nil {
return nil, err
} else {
c.Cache.Set(locKey, addr, 0)
return addr, nil
}
}