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Use hashicorp's LRU cache for DNS & certificates (#315)

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Taken from #301

Co-authored-by: Moritz Marquardt <git@momar.de>
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/315
This commit is contained in:
crapStone 2024-05-26 20:05:46 +00:00
parent b9a9467dba
commit 2c41e11f2f
10 changed files with 50 additions and 33 deletions
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20
server/dns/dns.go
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@ -5,22 +5,26 @@ import (
"strings"
"time"
"codeberg.org/codeberg/pages/server/cache"
"github.com/hashicorp/golang-lru/v2/expirable"
)
// lookupCacheTimeout specifies the timeout for the DNS lookup cache.
var lookupCacheTimeout = 15 * time.Minute
const (
lookupCacheValidity = 30 * time.Second
defaultPagesRepo = "pages"
)
var defaultPagesRepo = "pages"
// TODO(#316): refactor to not use global variables
var lookupCache *expirable.LRU[string, string] = expirable.NewLRU[string, string](4096, nil, lookupCacheValidity)
// GetTargetFromDNS searches for CNAME or TXT entries on the request domain ending with MainDomainSuffix.
// If everything is fine, it returns the target data.
func GetTargetFromDNS(domain, mainDomainSuffix, firstDefaultBranch string, dnsLookupCache cache.ICache) (targetOwner, targetRepo, targetBranch string) {
func GetTargetFromDNS(domain, mainDomainSuffix, firstDefaultBranch string) (targetOwner, targetRepo, targetBranch string) {
// Get CNAME or TXT
var cname string
var err error
if cachedName, ok := dnsLookupCache.Get(domain); ok {
cname = cachedName.(string)
if entry, ok := lookupCache.Get(domain); ok {
cname = entry
} else {
cname, err = net.LookupCNAME(domain)
cname = strings.TrimSuffix(cname, ".")
@ -38,7 +42,7 @@ func GetTargetFromDNS(domain, mainDomainSuffix, firstDefaultBranch string, dnsLo
}
}
}
_ = dnsLookupCache.Set(domain, cname, lookupCacheTimeout)
_ = lookupCache.Add(domain, cname)
}
if cname == "" {
return