Handle request mappings with regular expressions in MetricsFilter

Closes gh-7503

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/MetricsFilter.java

@@ -20,7 +20,6 @@ import java.io.IOException;
 import java.util.Collections;
 import java.util.LinkedHashSet;
 import java.util.Set;
-import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import javax.servlet.FilterChain;
@@ -67,7 +66,7 @@ final class MetricsFilter extends OncePerRequestFilter {
 
 	static {
 		Set<PatternReplacer> replacements = new LinkedHashSet<PatternReplacer>();
-		replacements.add(new PatternReplacer("[{}]", 0, "-"));
+		replacements.add(new PatternReplacer("\\{(.+?)(?::.+)?\\}", 0, "-$1-"));
 		replacements.add(new PatternReplacer("**", Pattern.LITERAL, "-star-star-"));
 		replacements.add(new PatternReplacer("*", Pattern.LITERAL, "-star-"));
 		replacements.add(new PatternReplacer("/-", Pattern.LITERAL, "/"));
@@ -140,13 +139,13 @@ final class MetricsFilter extends OncePerRequestFilter {
 
 	private void recordMetrics(HttpServletRequest request, String path, int status,
 			long time) {
-		String suffix = getFinalStatus(request, path, status);
+		String suffix = determineMetricNameSuffix(request, path, status);
 		submitMetrics(MetricsFilterSubmission.MERGED, request, status, time, suffix);
 		submitMetrics(MetricsFilterSubmission.PER_HTTP_METHOD, request, status, time,
 				suffix);
 	}
 
-	private String getFinalStatus(HttpServletRequest request, String path, int status) {
+	private String determineMetricNameSuffix(HttpServletRequest request, String path, int status) {
 		Object bestMatchingPattern = request
 				.getAttribute(HandlerMapping.BEST_MATCHING_PATTERN_ATTRIBUTE);
 		if (bestMatchingPattern != null) {
@@ -242,8 +241,7 @@ final class MetricsFilter extends OncePerRequestFilter {
 		}
 
 		public String apply(String input) {
-			return this.pattern.matcher(input)
+			return this.pattern.matcher(input).replaceAll(this.replacement);
-					.replaceAll(Matcher.quoteReplacement(this.replacement));
 		}
 
 	}

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/autoconfigure/MetricFilterAutoConfigurationTests.java

@@ -129,6 +129,51 @@ public class MetricFilterAutoConfigurationTests {
 		context.close();
 	}
 
+	@Test
+	public void recordsHttpInteractionsWithRegexTemplateVariable() throws Exception {
+		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
+				Config.class, MetricFilterAutoConfiguration.class);
+		Filter filter = context.getBean(Filter.class);
+		MockMvc mvc = MockMvcBuilders.standaloneSetup(new MetricFilterTestController())
+				.addFilter(filter).build();
+		mvc.perform(get("/templateVarRegexTest/foo")).andExpect(status().isOk());
+		verify(context.getBean(CounterService.class))
+				.increment("status.200.templateVarRegexTest.someVariable");
+		verify(context.getBean(GaugeService.class))
+				.submit(eq("response.templateVarRegexTest.someVariable"), anyDouble());
+		context.close();
+	}
+
+	@Test
+	public void recordsHttpInteractionsWithWilcardMapping() throws Exception {
+		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
+				Config.class, MetricFilterAutoConfiguration.class);
+		Filter filter = context.getBean(Filter.class);
+		MockMvc mvc = MockMvcBuilders.standaloneSetup(new MetricFilterTestController())
+				.addFilter(filter).build();
+		mvc.perform(get("/wildcardMapping/foo")).andExpect(status().isOk());
+		verify(context.getBean(CounterService.class))
+				.increment("status.200.wildcardMapping.star");
+		verify(context.getBean(GaugeService.class))
+				.submit(eq("response.wildcardMapping.star"), anyDouble());
+		context.close();
+	}
+
+	@Test
+	public void recordsHttpInteractionsWithDoubleWildcardMapping() throws Exception {
+		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
+				Config.class, MetricFilterAutoConfiguration.class);
+		Filter filter = context.getBean(Filter.class);
+		MockMvc mvc = MockMvcBuilders.standaloneSetup(new MetricFilterTestController())
+				.addFilter(filter).build();
+		mvc.perform(get("/doubleWildcardMapping/foo/bar/baz")).andExpect(status().isOk());
+		verify(context.getBean(CounterService.class))
+				.increment("status.200.doubleWildcardMapping.star-star.baz");
+		verify(context.getBean(GaugeService.class))
+				.submit(eq("response.doubleWildcardMapping.star-star.baz"), anyDouble());
+		context.close();
+	}
+
 	@Test
 	public void recordsKnown404HttpInteractionsAsSingleMetricWithPathAndTemplateVariable()
 			throws Exception {
@@ -429,6 +474,22 @@ public class MetricFilterAutoConfigurationTests {
 			return someVariable;
 		}
 
+		@RequestMapping("wildcardMapping/*")
+		public String testWildcardMapping() {
+			return "wildcard";
+		}
+
+		@RequestMapping("doubleWildcardMapping/**/baz")
+		public String testDoubleWildcardMapping() {
+			return "doubleWildcard";
+		}
+
+		@RequestMapping("templateVarRegexTest/{someVariable:[a-z]+}")
+		public String testTemplateVariableRegexResolution(
+				@PathVariable String someVariable) {
+			return someVariable;
+		}
+
 		@RequestMapping("knownPath/{someVariable}")
 		@ResponseStatus(HttpStatus.NOT_FOUND)
 		@ResponseBody