mirror of
https://github.com/Luzifer/staticmap.git
synced 2024-10-18 07:34:23 +00:00
42 lines
943 B
Go
42 lines
943 B
Go
package main
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import (
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"bytes"
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"io"
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"io/ioutil"
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"os"
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"path"
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"time"
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"github.com/golang/geo/s2"
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)
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func filesystemCache(center s2.LatLng, zoom int, marker []marker, x, y int) (io.ReadCloser, error) {
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cacheKey := cacheKeyHelper(center, zoom, marker, x, y)
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cacheFileName := path.Join(cfg.CacheDir, cacheKey[0:2], cacheKey+".png")
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if info, err := os.Stat(cacheFileName); err == nil && info.ModTime().Add(cfg.ForceCache).After(time.Now()) {
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return os.Open(cacheFileName)
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}
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// No cache hit, generate a new map
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mapReader, err := generateMap(center, zoom, marker, x, y)
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if err != nil {
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return nil, err
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}
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buf := new(bytes.Buffer)
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if _, err := io.Copy(buf, mapReader); err != nil {
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return nil, err
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}
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if err := os.MkdirAll(path.Dir(cacheFileName), 0755); err != nil {
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return nil, err
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}
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if err := ioutil.WriteFile(cacheFileName, buf.Bytes(), 0644); err != nil {
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return nil, err
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}
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return ioutil.NopCloser(buf), err
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}
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