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-rw-r--r--src/go/pkg/matcher/cache.go56
1 files changed, 56 insertions, 0 deletions
diff --git a/src/go/pkg/matcher/cache.go b/src/go/pkg/matcher/cache.go
new file mode 100644
index 000000000..4594fa06f
--- /dev/null
+++ b/src/go/pkg/matcher/cache.go
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package matcher
+
+import "sync"
+
+type (
+ cachedMatcher struct {
+ matcher Matcher
+
+ mux sync.RWMutex
+ cache map[string]bool
+ }
+)
+
+// WithCache adds cache to the matcher.
+func WithCache(m Matcher) Matcher {
+ switch m {
+ case TRUE(), FALSE():
+ return m
+ default:
+ return &cachedMatcher{matcher: m, cache: make(map[string]bool)}
+ }
+}
+
+func (m *cachedMatcher) Match(b []byte) bool {
+ s := string(b)
+ if result, ok := m.fetch(s); ok {
+ return result
+ }
+ result := m.matcher.Match(b)
+ m.put(s, result)
+ return result
+}
+
+func (m *cachedMatcher) MatchString(s string) bool {
+ if result, ok := m.fetch(s); ok {
+ return result
+ }
+ result := m.matcher.MatchString(s)
+ m.put(s, result)
+ return result
+}
+
+func (m *cachedMatcher) fetch(key string) (result bool, ok bool) {
+ m.mux.RLock()
+ result, ok = m.cache[key]
+ m.mux.RUnlock()
+ return
+}
+
+func (m *cachedMatcher) put(key string, result bool) {
+ m.mux.Lock()
+ m.cache[key] = result
+ m.mux.Unlock()
+}