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util.go
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util.go
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package tms
import (
"encoding/binary"
"fmt"
"log"
"path/filepath"
"regexp"
"strconv"
"strings"
"github.com/buckhx/mbtiles"
)
func info(format string, vals ...interface{}) {
log.Printf("Diglet info: "+format, vals...)
}
func warn(err error, extra string) {
if err != nil {
log.Printf("Diglet warning: %s - %s", err, extra)
}
}
func errorlog(err ...error) {
log.Printf("Diglet error: %s", err)
}
func check(err error) {
if err != nil {
panic(err)
log.Fatal("Fatal Diglet error: %s", err)
}
}
func checks(errs ...error) {
for _, err := range errs {
check(err)
}
}
var slugger = regexp.MustCompile("[^a-z0-9]+")
func slugged(s string) string {
return strings.Trim(slugger.ReplaceAllString(strings.ToLower(s), "-"), "-")
}
type header struct {
key, value string
}
var formatEncoding = map[mbtiles.Format][]header{
mbtiles.PNG: {{"Content-Type", "image/png"}},
mbtiles.JPG: {{"Content-Type", "image/jpeg"}},
mbtiles.GIF: {{"Content-Type", "image/gif"}},
mbtiles.WEBP: {{"Content-Type", "image/webp"}},
mbtiles.PBF_GZ: {{"Content-Type", "application/x-protobuf"}, {"Content-Encoding", "gzip"}},
mbtiles.PBF_DF: {{"Content-Type", "application/x-protobuf"}, {"Content-Encoding", "deflate"}},
mbtiles.UNKNOWN: {{"Content-Type", "application/octet-stream"}},
mbtiles.EMPTY: {{"Content-Type", "application/octet-stream"}},
}
func sprintSizeOf(v interface{}) string {
return strconv.Itoa(binary.Size(v))
}
func sprintf(format string, vals ...interface{}) string {
return fmt.Sprintf(format, vals...)
}
func errorf(format string, vals ...interface{}) error {
return fmt.Errorf(format, vals...)
}
func itoa(v int) string {
return strconv.Itoa(v)
}
func atoi(v string) (int, error) {
return strconv.Atoi(v)
}
func atof(v string) (float64, error) {
return strconv.ParseFloat(v, 64)
}
func cleanTilesetName(path string) (slug string) {
f := filepath.Base(path)
f = strings.TrimSuffix(f, filepath.Ext(f))
slug = slugged(f)
return
}
func toLower(v string) string {
return strings.ToLower(v)
}
func assertString(v interface{}) (err error) {
if _, ok := v.(string); !ok {
err = fmt.Errorf("Cannot assert string %q", v)
}
return
}
func assertNumber(v interface{}) (err error) {
if _, ok := v.(float64); !ok {
err = fmt.Errorf("Cannot assert number %q", v)
}
return
}
func castTile(t interface{}) (tile *mbtiles.Tile, err error) {
tile, ok := t.(*mbtiles.Tile)
if !ok {
err = fmt.Errorf("Cannot cast tile %q", t)
}
return
}
func validateParams(params map[string]interface{}, keys []string) (err error) {
for _, key := range keys {
if _, ok := params[key]; !ok {
err = fmt.Errorf("Missing param: %q", key)
}
}
return
}