diff options
Diffstat (limited to 'modules/caddyhttp/caddyauth/basicauth.go')
| -rw-r--r-- | modules/caddyhttp/caddyauth/basicauth.go | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/modules/caddyhttp/caddyauth/basicauth.go b/modules/caddyhttp/caddyauth/basicauth.go index eb6fd59..f515a72 100644 --- a/modules/caddyhttp/caddyauth/basicauth.go +++ b/modules/caddyhttp/caddyauth/basicauth.go @@ -26,6 +26,7 @@ import ( "time" "github.com/caddyserver/caddy/v2" + "golang.org/x/sync/singleflight" ) func init() { @@ -142,6 +143,7 @@ func (hba *HTTPBasicAuth) Provision(ctx caddy.Context) error { if hba.HashCache != nil { hba.HashCache.cache = make(map[string]bool) hba.HashCache.mu = new(sync.RWMutex) + hba.HashCache.g = new(singleflight.Group) } return nil @@ -190,12 +192,18 @@ func (hba HTTPBasicAuth) correctPassword(account Account, plaintextPassword []by if ok { return same, nil } - // slow track: do the expensive op, then add it to the cache - same, err := compare() + // but perform it in a singleflight group so that multiple + // parallel requests using the same password don't cause a + // thundering herd problem by all performing the same hashing + // operation before the first one finishes and caches it. + v, err, _ := hba.HashCache.g.Do(cacheKey, func() (any, error) { + return compare() + }) if err != nil { return false, err } + same = v.(bool) hba.HashCache.mu.Lock() if len(hba.HashCache.cache) >= 1000 { hba.HashCache.makeRoom() // keep cache size under control @@ -223,6 +231,7 @@ func (hba HTTPBasicAuth) promptForCredentials(w http.ResponseWriter, err error) // compute on every HTTP request. type Cache struct { mu *sync.RWMutex + g *singleflight.Group // map of concatenated hashed password + plaintext password + salt, to result cache map[string]bool |