// Lookup returns rectangles for the given address. Currently the only
// implementation is the Google geocoding service.
func Lookup(ctx *context.Context, address string) ([]Rect, error) {
mu.RLock()
rects, ok := cache[address]
mu.RUnlock()
if ok {
return rects, nil
}
rectsi, err := sf.Do(address, func() (interface{}, error) {
// TODO: static data files from OpenStreetMap, Wikipedia, etc?
urlStr := "https://maps.googleapis.com/maps/api/geocode/json?address=" + url.QueryEscape(address) + "&sensor=false"
res, err := ctx.HTTPClient().Get(urlStr)
if err != nil {
return nil, err
}
defer httputil.CloseBody(res.Body)
rects, err := decodeGoogleResponse(res.Body)
log.Printf("Google geocode lookup (%q) = %#v, %v", address, rects, err)
if err == nil {
mu.Lock()
cache[address] = rects
mu.Unlock()
}
return rects, err
})
if err != nil {
return nil, err
}
return rectsi.([]Rect), nil
}
func (im *imp) doGet(ctx *context.Context, url string, form url.Values) (*http.Response, error) {
creds := im.creds()
if creds == nil {
return nil, errors.New("No OAuth credentials. Not logged in?")
}
res, err := oauthClient.Get(ctx.HTTPClient(), creds, url, form)
if err != nil {
return nil, fmt.Errorf("Error fetching %s: %v", url, err)
}
if res.StatusCode != http.StatusOK {
return nil, fmt.Errorf("Get request on %s failed with: %s", url, res.Status)
}
return res, nil
}
func doGet(ctx *context.Context, url string) ([]byte, error) {
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
res, err := ctx.HTTPClient().Do(req)
if err != nil {
log.Printf("Error fetching %s: %v", url, err)
return nil, err
}
defer httputil.CloseBody(res.Body)
if res.StatusCode != http.StatusOK {
return nil, fmt.Errorf("Get request on %s failed with: %s", url, res.Status)
}
return ioutil.ReadAll(io.LimitReader(res.Body, 8<<20))
}
func doGet(ctx *context.Context, url string, form url.Values) (*http.Response, error) {
requestURL := url + "?" + form.Encode()
req, err := http.NewRequest("GET", requestURL, nil)
if err != nil {
return nil, err
}
res, err := ctx.HTTPClient().Do(req)
if err != nil {
log.Printf("Error fetching %s: %v", url, err)
return nil, err
}
if res.StatusCode != http.StatusOK {
return nil, fmt.Errorf("Get request on %s failed with: %s", requestURL, res.Status)
}
return res, nil
}