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Only rewrite a cache file if it doesn't already come from the cache

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Fixes #150
This commit is contained in:
Frank Denis 2018-02-19 15:36:48 +01:00
parent 8fc135ad79
commit 6baafe3232
1 changed files with 4 additions and 2 deletions
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6
dnscrypt-proxy/sources.go
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@ -49,6 +49,8 @@ func fetchFromCache(cacheFile string) (in string, delayTillNextUpdate time.Durat
} else {
dlog.Debugf("Cache file [%s] needs to be refreshed", cacheFile)
delayTillNextUpdate = time.Duration(0)
err = errors.New("cached entry has expired")
return
}
var bin []byte
bin, err = ioutil.ReadFile(cacheFile)
@ -278,8 +280,8 @@ func (source *Source) parseV2(prefix string) ([]RegisteredServer, error) {
}
func PrefetchSourceURL(xTransport *XTransport, urlToPrefetch *URLToPrefetch) error {
in, _, delayTillNextUpdate, err := fetchWithCache(xTransport, urlToPrefetch.url, urlToPrefetch.cacheFile)
if err == nil {
in, cached, delayTillNextUpdate, err := fetchWithCache(xTransport, urlToPrefetch.url, urlToPrefetch.cacheFile)
if err == nil && cached == false {
AtomicFileWrite(urlToPrefetch.cacheFile, []byte(in))
}
urlToPrefetch.when = time.Now().Add(delayTillNextUpdate)