Add cache for compiled glob patterns

iam/access/access_test.go

@@ -101,3 +101,23 @@ func TestAccessManager(t *testing.T) {
 	ok, _ = am.Enforce("foobar", "group", "blubb", "/", "write")
 	require.True(t, ok)
 }
+
+func BenchmarkEnforce(b *testing.B) {
+	adapter, err := createAdapter()
+	require.NoError(b, err)
+
+	am, err := New(Config{
+		Adapter: adapter,
+		Logger:  nil,
+	})
+	require.NoError(b, err)
+
+	am.AddPolicy("$anon", "$none", []string{"foobar"}, "**", []string{"ANY"})
+
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		ok, _ := am.Enforce("$anon", "$none", "foobar", "baz", "read")
+		require.True(b, ok)
+	}
+}

iam/access/functions.go

@@ -2,10 +2,14 @@ package access
 
 import (
 	"strings"
+	"sync"
 
 	"github.com/datarhei/core/v16/glob"
 )
 
+var globcache = map[string]glob.Glob{}
+var globcacheMu = sync.RWMutex{}
+
 func resourceMatch(request, policy string) bool {
 	reqPrefix, reqResource := getPrefix(request)
 	polPrefix, polResource := getPrefix(policy)
@@ -31,16 +35,38 @@ func resourceMatch(request, policy string) bool {
 
 	match = false
 
+	key := reqType + polResource
+
 	if reqType == "api" || reqType == "fs" || reqType == "rtmp" || reqType == "srt" {
-		match, err = glob.Match(polResource, reqResource, rune('/'))
+		globcacheMu.RLock()
+		matcher, ok := globcache[key]
+		globcacheMu.RUnlock()
+		if !ok {
+			matcher, err = glob.Compile(polResource, rune('/'))
 			if err != nil {
 				return false
 			}
+			globcacheMu.Lock()
+			globcache[key] = matcher
+			globcacheMu.Unlock()
+		}
+
+		match = matcher.Match(reqResource)
 	} else {
-		match, err = glob.Match(polResource, reqResource)
+		globcacheMu.RLock()
+		matcher, ok := globcache[key]
+		globcacheMu.RUnlock()
+		if !ok {
+			matcher, err = glob.Compile(polResource)
 			if err != nil {
 				return false
 			}
+			globcacheMu.Lock()
+			globcache[key] = matcher
+			globcacheMu.Unlock()
+		}
+
+		match = matcher.Match(reqResource)
 	}
 
 	return match