98 lines
2.3 KiB
Go
98 lines
2.3 KiB
Go
/*
|
|
* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
|
|
* Author: Alex Yatskov <alex@foosoft.net>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy of
|
|
* this software and associated documentation files (the "Software"), to deal in
|
|
* the Software without restriction, including without limitation the rights to
|
|
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
|
|
* the Software, and to permit persons to whom the Software is furnished to do so,
|
|
* subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in all
|
|
* copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
|
|
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
|
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
|
|
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
package geo
|
|
|
|
import (
|
|
"encoding/json"
|
|
"io/ioutil"
|
|
"os"
|
|
"time"
|
|
|
|
"github.com/kellydunn/golang-geo"
|
|
)
|
|
|
|
type Coord struct {
|
|
Latitude float64
|
|
Longitude float64
|
|
}
|
|
|
|
type Cache struct {
|
|
filename string
|
|
data map[string]Coord
|
|
ticker *time.Ticker
|
|
coder geo.GoogleGeocoder
|
|
}
|
|
|
|
func NewCache(filename string) (*Cache, error) {
|
|
cache := &Cache{
|
|
filename: filename,
|
|
data: make(map[string]Coord),
|
|
ticker: time.NewTicker(time.Millisecond * 200),
|
|
}
|
|
|
|
if err := cache.load(); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return cache, nil
|
|
}
|
|
|
|
func (c *Cache) load() error {
|
|
file, err := os.Open(c.filename)
|
|
if os.IsNotExist(err) {
|
|
return nil
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer file.Close()
|
|
|
|
return json.NewDecoder(file).Decode(&c.data)
|
|
}
|
|
|
|
func (c *Cache) Save() error {
|
|
js, err := json.MarshalIndent(c.data, "", " ")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return ioutil.WriteFile(c.filename, js, 0644)
|
|
}
|
|
|
|
func (c *Cache) Decode(address string) (Coord, error) {
|
|
if coord, ok := c.data[address]; ok {
|
|
return coord, nil
|
|
}
|
|
|
|
<-c.ticker.C
|
|
|
|
point, err := c.coder.Geocode(address)
|
|
if err != nil {
|
|
return Coord{}, err
|
|
}
|
|
|
|
coord := Coord{point.Lat(), point.Lng()}
|
|
c.data[address] = coord
|
|
return coord, nil
|
|
}
|