track-number-of-optimized-regexp-label-matchers - make isRegexOptimized (#481)

public

Signed-off-by: dhanu <andreasdhanu@gmail.com>

model/labels/matcher.go

@@ -137,3 +137,11 @@ func (m *Matcher) Prefix() string {
 	}
 	return m.re.prefix
 }
+
+// IsRegexOptimized returns whether regex is optimized.
+func (m *Matcher) IsRegexOptimized() bool {
+	if m.re == nil {
+		return false
+	}
+	return m.re.IsOptimized()
+}

model/labels/matcher_test.go

@@ -186,6 +186,30 @@ func TestPrefix(t *testing.T) {
 	}
 }
 
+func TestIsRegexOptimized(t *testing.T) {
+	for i, tc := range []struct {
+		matcher          *Matcher
+		isRegexOptimized bool
+	}{
+		{
+			matcher:          mustNewMatcher(t, MatchEqual, "abc"),
+			isRegexOptimized: false,
+		},
+		{
+			matcher:          mustNewMatcher(t, MatchRegexp, "."),
+			isRegexOptimized: false,
+		},
+		{
+			matcher:          mustNewMatcher(t, MatchRegexp, "abc.+"),
+			isRegexOptimized: true,
+		},
+	} {
+		t.Run(fmt.Sprintf("%d: %s", i, tc.matcher), func(t *testing.T) {
+			require.Equal(t, tc.isRegexOptimized, tc.matcher.IsRegexOptimized())
+		})
+	}
+}
+
 func BenchmarkMatchType_String(b *testing.B) {
 	for i := 0; i <= b.N; i++ {
 		_ = MatchType(i % int(MatchNotRegexp+1)).String()

model/labels/regexp.go

@@ -151,11 +151,9 @@ func (m *FastRegexMatcher) compileMatchStringFunction() func(string) bool {
 	}
 }
 
-// isOptimized returns true if any fast-path optimization is applied to the
+// IsOptimized returns true if any fast-path optimization is applied to the
 // regex matcher.
-//
+func (m *FastRegexMatcher) IsOptimized() bool {
-//nolint:unused
-func (m *FastRegexMatcher) isOptimized() bool {
 	return len(m.setMatches) > 0 || m.stringMatcher != nil || m.prefix != "" || m.suffix != "" || m.contains != ""
 }
 

model/labels/regexp_test.go

@@ -582,7 +582,7 @@ func TestAnalyzeRealQueries(t *testing.T) {
 		numChecked++
 
 		// Check if each regexp matcher is supported by our optimization.
-		if m.isOptimized() {
+		if m.IsOptimized() {
 			numOptimized++
 			info.optimized = true
 		}