/
cache.go
58 lines (47 loc) · 1 KB
/
cache.go
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package main
import (
"io/ioutil"
"net/http"
"github.com/Sirupsen/logrus"
"github.com/bradfitz/gomemcache/memcache"
"github.com/golang/snappy/snappy"
)
var cacher *memcache.Client
func initializeCache() {
var err error
cacher = memcache.New(config.MCHost)
if err != nil {
logrus.Fatal("cache:", err)
}
}
func getRemoteURL(url string) ([]byte, error) {
item, err := cacher.Get(url)
if err != nil && err != memcache.ErrCacheMiss {
return nil, err
}
if err == memcache.ErrCacheMiss {
res, err := http.Get(url)
if err != nil {
return nil, err
}
defer res.Body.Close()
body, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, err
}
content, err := snappy.Encode(nil, body)
if err != nil {
return nil, err
}
err = cacher.Set(&memcache.Item{Key: url, Value: content, Expiration: config.MCTTL})
if err != nil {
return nil, err
}
return body, nil
}
content, err := snappy.Decode(nil, item.Value)
if err != nil {
return nil, err
}
return content, nil
}