62 lines
1.2 KiB
Go
62 lines
1.2 KiB
Go
package web
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import (
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"github.com/prometheus/client_golang/prometheus"
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"image/color"
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"mapserver/app"
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"mapserver/coords"
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"mapserver/tilerenderer"
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"net/http"
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"strconv"
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"strings"
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)
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type Tiles struct {
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ctx *app.App
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blank []byte
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}
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func (t *Tiles) Init() {
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t.blank = tilerenderer.CreateBlankTile(color.RGBA{255, 255, 255, 255})
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}
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func (t *Tiles) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
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str := strings.TrimPrefix(req.URL.Path, "/api/tile/")
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// {layerId}/x/y/zoom
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parts := strings.Split(str, "/")
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if len(parts) != 4 {
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resp.WriteHeader(500)
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resp.Write([]byte("wrong number of arguments"))
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return
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}
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timer := prometheus.NewTimer(tileServeDuration)
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defer timer.ObserveDuration()
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layerid, _ := strconv.Atoi(parts[0])
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x, _ := strconv.Atoi(parts[1])
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y, _ := strconv.Atoi(parts[2])
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zoom, _ := strconv.Atoi(parts[3])
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c := coords.NewTileCoords(x, y, zoom, layerid)
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tile, err := t.ctx.TileDB.GetTile(c)
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if err != nil {
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resp.WriteHeader(500)
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resp.Write([]byte(err.Error()))
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} else {
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resp.Header().Add("content-type", "image/png")
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if tile == nil {
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resp.Write(t.blank)
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//TODO: cache/layer color
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} else {
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tilesCumulativeSize.Add(float64(len(tile)))
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resp.Write(tile)
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}
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}
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}
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