Ensure compatibility with latest 5.x Apache HC

Tests were failing because overriding the less specific execute method resulted in our code not being called at all in newer versions. The changes here should work with both versions of the code.

Resolves gh-5575

micrometer-core/src/main/java/io/micrometer/core/instrument/binder/httpcomponents/hc5/HttpContextUtils.java

@@ -17,6 +17,7 @@
 
 import io.micrometer.core.instrument.Tags;
 import org.apache.hc.client5.http.HttpRoute;
+import org.apache.hc.client5.http.protocol.HttpClientContext;
 import org.apache.hc.core5.http.HttpHost;
 import org.apache.hc.core5.http.protocol.HttpContext;
 
@@ -31,9 +32,15 @@ static String[] generateTagStringsForRoute(HttpContext context) {
         String targetScheme = "UNKNOWN";
         String targetHost = "UNKNOWN";
         String targetPort = "UNKNOWN";
-        Object routeAttribute = context.getAttribute("http.route");
-        if (routeAttribute instanceof HttpRoute) {
-            HttpHost host = ((HttpRoute) routeAttribute).getTargetHost();
+        Object route;
+        if (context instanceof HttpClientContext) {
+            route = ((HttpClientContext) context).getHttpRoute();
+        }
+        else {
+            route = context.getAttribute("http.route");
+        }
+        if (route instanceof HttpRoute) {
+            HttpHost host = ((HttpRoute) route).getTargetHost();
             targetScheme = host.getSchemeName();
             targetHost = host.getHostName();
             targetPort = String.valueOf(host.getPort());

micrometer-core/src/main/java/io/micrometer/core/instrument/binder/httpcomponents/hc5/MicrometerHttpRequestExecutor.java

@@ -28,6 +28,7 @@
 import org.apache.hc.core5.http.*;
 import org.apache.hc.core5.http.impl.io.HttpRequestExecutor;
 import org.apache.hc.core5.http.io.HttpClientConnection;
+import org.apache.hc.core5.http.io.HttpResponseInformationCallback;
 import org.apache.hc.core5.http.protocol.HttpContext;
 import org.apache.hc.core5.util.Timeout;
 
@@ -102,17 +103,18 @@ public static Builder builder(MeterRegistry registry) {
     }
 
     @Override
-    public ClassicHttpResponse execute(ClassicHttpRequest request, HttpClientConnection conn, HttpContext context)
+    public ClassicHttpResponse execute(ClassicHttpRequest request, HttpClientConnection conn,
+            @Nullable HttpResponseInformationCallback informationCallback, HttpContext localContext)
             throws IOException, HttpException {
         ObservationOrTimerCompatibleInstrumentation<ApacheHttpClientContext> sample = ObservationOrTimerCompatibleInstrumentation
             .start(registry, observationRegistry, () -> new ApacheHttpClientContext(request,
-                    HttpClientContext.adapt(context), uriMapper, exportTagsForRoute), convention,
+                    HttpClientContext.adapt(localContext), uriMapper, exportTagsForRoute), convention,
                     DefaultApacheHttpClientObservationConvention.INSTANCE);
         String statusCodeOrError = "UNKNOWN";
         Outcome statusOutcome = Outcome.UNKNOWN;
 
         try {
-            ClassicHttpResponse response = super.execute(request, conn, context);
+            ClassicHttpResponse response = super.execute(request, conn, informationCallback, localContext);
             sample.setResponse(response);
             statusCodeOrError = DefaultApacheHttpClientObservationConvention.INSTANCE.getStatusValue(response, null);
             statusOutcome = DefaultApacheHttpClientObservationConvention.INSTANCE.getStatusOutcome(response);
@@ -130,11 +132,17 @@ public ClassicHttpResponse execute(ClassicHttpRequest request, HttpClientConnect
                     () -> Tags
                         .of("method", DefaultApacheHttpClientObservationConvention.INSTANCE.getMethodString(request),
                                 "uri", uriMapper.apply(request), "status", status, "outcome", outcome)
-                        .and(exportTagsForRoute ? HttpContextUtils.generateTagsForRoute(context) : Tags.empty())
+                        .and(exportTagsForRoute ? HttpContextUtils.generateTagsForRoute(localContext) : Tags.empty())
                         .and(extraTags));
         }
     }
 
+    @Override
+    public ClassicHttpResponse execute(ClassicHttpRequest request, HttpClientConnection conn, HttpContext context)
+            throws IOException, HttpException {
+        return execute(request, conn, null, context);
+    }
+
     public static class Builder {
 
         private final MeterRegistry registry;