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Caching Geo Tile Server using graceful, httpcache and gfx.
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package main | |
import ( | |
"flag" | |
"io/ioutil" | |
"net/http" | |
"net/url" | |
"os" | |
"strconv" | |
"github.com/TV4/graceful" | |
"github.com/gregjones/httpcache" | |
"github.com/gregjones/httpcache/diskcache" | |
"github.com/peterhellberg/gfx" | |
) | |
const ( | |
defaultTileSize = 512 | |
defaultFormat = "https://a.basemaps.cartocdn.com/rastertiles/voyager/%d/%d/%d@2x.png" | |
defaultPort = "2019" | |
) | |
type server struct { | |
*http.Client | |
gfx.GeoTileServer | |
} | |
func (s *server) ServeHTTP(w http.ResponseWriter, r *http.Request) { | |
gt := geoTile(r) | |
rawurl := gt.Rawurl(s.Format) | |
resp, err := s.Get(rawurl) | |
if err != nil { | |
return | |
} | |
defer resp.Body.Close() | |
if b, err := ioutil.ReadAll(resp.Body); err == nil { | |
gfx.Log("%#v from %s", gt, rawurl) | |
w.Header().Set("Content-Type", resp.Header.Get("Content-Type")) | |
w.Header().Set("Content-Length", resp.Header.Get("Content-Length")) | |
w.Header().Set("Cache-Control", resp.Header.Get("Cache-Control")) | |
w.Header().Set("X-From-Cache", resp.Header.Get("X-From-Cache")) | |
w.Header().Set("Server", resp.Header.Get("Server")) | |
w.Header().Set("Date", resp.Header.Get("Date")) | |
w.WriteHeader(resp.StatusCode) | |
w.Write(b) | |
} | |
} | |
func main() { | |
var tileSize int | |
var format string | |
flag.IntVar(&tileSize, "tileSize", defaultTileSize, "") | |
flag.StringVar(&format, "format", defaultFormat, "") | |
flag.Parse() | |
c := diskcache.New("data/") | |
t := httpcache.NewTransport(c) | |
graceful.LogListenAndServe(&http.Server{ | |
Addr: addr(), | |
Handler: &server{ | |
Client: t.Client(), | |
GeoTileServer: gfx.GTS(tileSize, format), | |
}, | |
}) | |
} | |
func geoTile(r *http.Request) gfx.GeoTile { | |
q := r.URL.Query() | |
return gfx.GT(getInt(q, "zoom"), getInt(q, "x"), getInt(q, "y")) | |
} | |
func getInt(q url.Values, name string) int { | |
i, _ := strconv.Atoi(q.Get(name)) | |
return i | |
} | |
func addr() string { | |
if port := os.Getenv("PORT"); port != "" { | |
return ":" + port | |
} | |
return ":" + defaultPort | |
} |
Author
peterhellberg
commented
Feb 15, 2019
package main
import "github.com/peterhellberg/gfx"
const (
zoomLevels = 18
tileSize = 512
tileFormat = "http://0.0.0.0:2019?zoom=%d&x=%d&y=%d"
)
func main() {
p := gfx.GP(59.270889, 18.048125)
s := gfx.GTS(tileSize, tileFormat)
a := gfx.Animation{Delay: 30, LoopCount: -1}
cp := gfx.PaletteBasemaps.AsColorPalette()
for zoom := 2; zoom < zoomLevels; zoom++ {
dst := gfx.NewImage(tileSize/2+tileSize, tileSize/2+tileSize)
s.DrawTileAndNeighbors(dst, p.GeoTile(zoom), p)
gfx.DrawCircleFilled(dst, gfx.BoundsCenter(dst.Bounds()), 2, gfx.ColorBlack)
a.AddFrame(dst, cp)
}
a.SaveGIF("gfx-geo-tiles-carto-basemaps-animated.gif")
}
Comparison of a few different tilesets: http://mapstyle.petschge.de/
Another comparison: https://mc.bbbike.org/mc/?profile=retina
var PaletteOsmand = gfx.Palette{
{0x00, 0x92, 0xDA, 0xFF},
{0x0B, 0x0C, 0xFD, 0xFF},
{0x11, 0x11, 0xFE, 0xFF},
{0x16, 0x16, 0xFC, 0xFF},
{0x18, 0x18, 0xFD, 0xFF},
{0x1B, 0x1A, 0x1A, 0xFF},
{0x1E, 0x9F, 0xDD, 0xFF},
{0x3B, 0x3B, 0x3A, 0xFF},
{0x41, 0xAD, 0xE2, 0xFF},
{0x44, 0xB5, 0x53, 0xFF},
{0x45, 0xB6, 0x54, 0xFF},
{0x45, 0xB7, 0x54, 0xFF},
{0x4A, 0x4A, 0x4A, 0xFF},
{0x4F, 0xB3, 0xE3, 0xFF},
{0x50, 0xB1, 0xE1, 0xFF},
{0x57, 0x57, 0x57, 0xFF},
{0x5E, 0xBB, 0x5C, 0xFF},
{0x5E, 0xBC, 0x5C, 0xFF},
{0x60, 0x5F, 0x5E, 0xFF},
{0x68, 0xBE, 0x5F, 0xFF},
{0x74, 0x4C, 0x0B, 0xFF},
{0x75, 0xC3, 0xEA, 0xFF},
{0x78, 0x51, 0x12, 0xFF},
{0x79, 0x81, 0xB0, 0xFF},
{0x80, 0x80, 0x80, 0xFF},
{0x83, 0x7B, 0x7B, 0xFF},
{0x87, 0x86, 0x86, 0xFF},
{0x87, 0x86, 0xF3, 0xFF},
{0x87, 0xC4, 0x6A, 0xFF},
{0x8C, 0xC3, 0x6B, 0xFF},
{0x8D, 0xC5, 0x6C, 0xFF},
{0x8F, 0xC5, 0x70, 0xFF},
{0x91, 0x8D, 0x87, 0xFF},
{0x91, 0x91, 0x91, 0xFF},
{0x94, 0x76, 0x4D, 0xFF},
{0x96, 0x77, 0x46, 0xFF},
{0x99, 0x99, 0x99, 0xFF},
{0xA0, 0xD2, 0xED, 0xFF},
{0xA1, 0xA0, 0x9E, 0xFF},
{0xA2, 0x89, 0x69, 0xFF},
{0xA7, 0xA4, 0xA6, 0xFF},
{0xAA, 0x87, 0xA6, 0xFF},
{0xAF, 0x9A, 0xA8, 0xFF},
{0xB0, 0x9F, 0x91, 0xFF},
{0xB4, 0xB3, 0xB2, 0xFF},
{0xB7, 0xAE, 0xB5, 0xFF},
{0xBA, 0xA8, 0xA0, 0xFF},
{0xBB, 0xBB, 0xBB, 0xFF},
{0xBB, 0xBC, 0xBB, 0xFF},
{0xBD, 0xAA, 0x8C, 0xFF},
{0xBD, 0xBD, 0xBD, 0xFF},
{0xBE, 0xBE, 0xBE, 0xFF},
{0xC0, 0xAF, 0xAF, 0xFF},
{0xC1, 0xB0, 0xB0, 0xFF},
{0xC1, 0xB6, 0xC6, 0xFF},
{0xC2, 0xB1, 0xB0, 0xFF},
{0xC2, 0xB2, 0xB1, 0xFF},
{0xC2, 0xB3, 0xB2, 0xFF},
{0xC2, 0xB3, 0xC2, 0xFF},
{0xC2, 0xBF, 0xB3, 0xFF},
{0xC4, 0xDD, 0xE5, 0xFF},
{0xC7, 0xC6, 0xC6, 0xFF},
{0xCC, 0x5F, 0xA3, 0xFF},
{0xCC, 0xCC, 0xCC, 0xFF},
{0xCD, 0xF1, 0xF3, 0xFF},
{0xD3, 0xD1, 0xCF, 0xFF},
{0xD5, 0x25, 0x98, 0xFF},
{0xD7, 0xB4, 0xDA, 0xFF},
{0xD8, 0xB7, 0xDB, 0xFF},
{0xD9, 0x05, 0x93, 0xFF},
{0xD9, 0x93, 0x80, 0xFF},
{0xDA, 0x96, 0x80, 0xFF},
{0xDA, 0xDA, 0xDA, 0xFF},
{0xDD, 0xDD, 0xDD, 0xFF},
{0xDF, 0xD8, 0xB2, 0xFF},
{0xE1, 0xC8, 0xE3, 0xFF},
{0xE6, 0xBD, 0x7E, 0xFF},
{0xE6, 0xCB, 0xC8, 0xFF},
{0xE9, 0xE6, 0xE1, 0xFF},
{0xE9, 0xEC, 0xE3, 0xFF},
{0xEB, 0xEB, 0xEA, 0xFF},
{0xED, 0xB0, 0xA4, 0xFF},
{0xF2, 0xEF, 0xE9, 0xFF},
{0xF3, 0xEB, 0xB4, 0xFF},
{0xF5, 0xF3, 0xF1, 0xFF},
{0xF6, 0xF5, 0xF5, 0xFF},
{0xF7, 0xA2, 0x97, 0xFF},
{0xF8, 0x88, 0x7C, 0xFF},
{0xF9, 0x82, 0x75, 0xFF},
{0xF9, 0x84, 0x76, 0xFF},
{0xFD, 0xFC, 0xFD, 0xFF},
{0xFF, 0xD0, 0x80, 0xFF},
{0xFF, 0xFF, 0xFF, 0xFF},
}
var PaletteHikeBike = gfx.Palette{
{0x19, 0x9B, 0xD5, 0xFF},
{0x27, 0xA0, 0xD3, 0xFF},
{0x3A, 0x3A, 0x3A, 0xFF},
{0x56, 0x56, 0x56, 0xFF},
{0x57, 0xB2, 0xCD, 0xFF},
{0x6C, 0x6C, 0xF4, 0xFF},
{0x75, 0x62, 0x5E, 0xFF},
{0x79, 0x82, 0xB0, 0xFF},
{0x81, 0x88, 0xFB, 0xFF},
{0x83, 0x83, 0x83, 0xFF},
{0x88, 0x9B, 0xAC, 0xFF},
{0x92, 0x92, 0x92, 0xFF},
{0x97, 0xB7, 0x9B, 0xFF},
{0x98, 0x97, 0x95, 0xFF},
{0x99, 0x99, 0x99, 0xFF},
{0x9B, 0x79, 0x72, 0xFF},
{0x9D, 0xD3, 0x9D, 0xFF},
{0xA5, 0x8B, 0x60, 0xFF},
{0xA6, 0x8C, 0x62, 0xFF},
{0xA8, 0xA8, 0xA8, 0xFF},
{0xAA, 0x92, 0x6B, 0xFF},
{0xAB, 0xD4, 0xD5, 0xFF},
{0xAC, 0xCD, 0x9F, 0xFF},
{0xAE, 0xC2, 0xF9, 0xFF},
{0xAE, 0xD5, 0xD6, 0xFF},
{0xAF, 0x96, 0x74, 0xFF},
{0xB0, 0xD7, 0xA9, 0xFF},
{0xB1, 0xCF, 0xAB, 0xFF},
{0xB3, 0xCF, 0xA7, 0xFF},
{0xB5, 0xCA, 0xF9, 0xFF},
{0xB6, 0xB6, 0xB6, 0xFF},
{0xB6, 0xCA, 0xF7, 0xFF},
{0xBC, 0xCE, 0xB5, 0xFF},
{0xBC, 0xD1, 0xBC, 0xFF},
{0xBC, 0xDD, 0xEA, 0xFF},
{0xBE, 0xD7, 0xB1, 0xFF},
{0xC0, 0xD5, 0xB3, 0xFF},
{0xC2, 0xC2, 0xEE, 0xFF},
{0xC4, 0xC4, 0xC3, 0xFF},
{0xC9, 0xE4, 0xF9, 0xFF},
{0xCB, 0xDD, 0xD2, 0xFF},
{0xCC, 0xCC, 0xCC, 0xFF},
{0xCF, 0xE2, 0xEF, 0xFF},
{0xD4, 0xD0, 0xC7, 0xFF},
{0xD6, 0xE1, 0xE8, 0xFF},
{0xD7, 0xDC, 0xC6, 0xFF},
{0xD7, 0xDD, 0xD1, 0xFF},
{0xD8, 0xDF, 0xC8, 0xFF},
{0xD9, 0x9E, 0x91, 0xFF},
{0xD9, 0xE0, 0xC9, 0xFF},
{0xDC, 0xA2, 0x90, 0xFF},
{0xDE, 0xE0, 0xD7, 0xFF},
{0xDE, 0xE1, 0xE2, 0xFF},
{0xDE, 0xE5, 0xB9, 0xFF},
{0xDF, 0xE0, 0xDC, 0xFF},
{0xE0, 0xD4, 0xBF, 0xFF},
{0xE0, 0xD5, 0xBC, 0xFF},
{0xE0, 0xE0, 0xDD, 0xFF},
{0xE0, 0xE1, 0xE0, 0xFF},
{0xE1, 0xE1, 0xE0, 0xFF},
{0xE2, 0xDC, 0xBC, 0xFF},
{0xE5, 0xE3, 0xE1, 0xFF},
{0xE7, 0xD2, 0xA7, 0xFF},
{0xF5, 0xE8, 0xAF, 0xFF},
{0xF5, 0xEC, 0xB2, 0xFF},
{0xF6, 0xEE, 0xB6, 0xFF},
{0xF6, 0xF8, 0xDB, 0xFF},
{0xF8, 0xC0, 0x7B, 0xFF},
{0xFD, 0xBC, 0x70, 0xFF},
}
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