HTTPServer using Collector rather than CollectorRegistry.

Signed-off-by: Marcin Kielar <zorba128@interia.pl>

Author: zorba128

prometheus-metrics-exporter-common/src/main/java/io/prometheus/metrics/exporter/common/PrometheusScrapeHandler.java

@@ -93,7 +93,7 @@ public void handleRequest(PrometheusHttpExchange exchange) throws IOException {
 
     private Predicate<String> makeNameFilter(ExporterFilterProperties props) {
         if (props.getAllowedMetricNames() == null && props.getExcludedMetricNames() == null && props.getAllowedMetricNamePrefixes() == null && props.getExcludedMetricNamePrefixes() == null) {
-            return null;
+            return MetricNameFilter.ALLOW_ALL;
         } else {
             return MetricNameFilter.builder()
                     .nameMustBeEqualTo(props.getAllowedMetricNames())
@@ -105,22 +105,16 @@ private Predicate<String> makeNameFilter(ExporterFilterProperties props) {
     }
 
     private MetricSnapshots scrape(PrometheusHttpRequest request) {
-
         Predicate<String> filter = makeNameFilter(request.getParameterValues("name[]"));
         return registry.collect(filter, request);
     }
 
     private Predicate<String> makeNameFilter(String[] includedNames) {
-        Predicate<String> result = MetricNameFilter.ALLOW_ALL;
         if (includedNames != null && includedNames.length > 0) {
-            result = MetricNameFilter.builder().nameMustBeEqualTo(includedNames).build();
-        }
-        if (result != null && nameFilter != null) {
-            result = result.and(nameFilter);
-        } else if (nameFilter != null) {
-            result = nameFilter;
+            return nameFilter.and(MetricNameFilter.builder().nameMustBeEqualTo(includedNames).build());
+        } else {
+            return nameFilter;
         }
-        return result;
     }
 
     private boolean writeDebugResponse(MetricSnapshots snapshots, PrometheusHttpExchange exchange) throws IOException {

prometheus-metrics-exporter-httpserver/src/main/java/io/prometheus/metrics/exporter/httpserver/HTTPServer.java

@@ -6,8 +6,8 @@
 import com.sun.net.httpserver.HttpServer;
 import com.sun.net.httpserver.HttpsConfigurator;
 import com.sun.net.httpserver.HttpsServer;
-import io.prometheus.metrics.config.ExporterHttpServerProperties;
 import io.prometheus.metrics.config.PrometheusProperties;
+import io.prometheus.metrics.model.registry.Collector;
 import io.prometheus.metrics.model.registry.PrometheusRegistry;
 
 import java.io.Closeable;
@@ -46,7 +46,7 @@ public class HTTPServer implements Closeable {
     protected final HttpServer server;
     protected final ExecutorService executorService;
 
-    private HTTPServer(PrometheusProperties config, ExecutorService executorService, HttpServer httpServer, PrometheusRegistry registry, Authenticator authenticator, HttpHandler defaultHandler) {
+    private HTTPServer(PrometheusProperties config, ExecutorService executorService, HttpServer httpServer, Collector registry, Authenticator authenticator, HttpHandler defaultHandler) {
         if (httpServer.getAddress() == null) {
             throw new IllegalArgumentException("HttpServer hasn't been bound to an address");
         }
@@ -104,7 +104,7 @@ public static class Builder {
         private String hostname = null;
         private InetAddress inetAddress = null;
         private ExecutorService executorService = null;
-        private PrometheusRegistry registry = null;
+        private Collector registry = null;
         private Authenticator authenticator = null;
         private HttpsConfigurator httpsConfigurator = null;
         private HttpHandler defaultHandler = null;
@@ -153,7 +153,7 @@ public Builder executorService(ExecutorService executorService) {
         /**
          * Optional: Default is {@link PrometheusRegistry#defaultRegistry}.
          */
-        public Builder registry(PrometheusRegistry registry) {
+        public Builder registry(Collector registry) {
             this.registry = registry;
             return this;
         }

prometheus-metrics-exporter-httpserver/src/main/java/io/prometheus/metrics/exporter/httpserver/MetricsHandler.java

@@ -35,7 +35,7 @@ public MetricsHandler(PrometheusProperties config) {
         prometheusScrapeHandler = new PrometheusScrapeHandler(config);
     }
 
-    public MetricsHandler(PrometheusProperties config, PrometheusRegistry registry) {
+    public MetricsHandler(PrometheusProperties config, Collector registry) {
         prometheusScrapeHandler = new PrometheusScrapeHandler(config, registry);
     }
 

prometheus-metrics-model/src/main/java/io/prometheus/metrics/model/registry/MetricNameFilter.java

@@ -190,6 +190,7 @@ public Builder nameMustNotStartWith(Collection<String> prefixes) {
         }
 
         public MetricNameFilter build() {
+            // TODO: should return MetricNameFilter.ALLOW_ALL if no filtering is needed
             return new MetricNameFilter(nameEqualTo, nameNotEqualTo, nameStartsWith, nameDoesNotStartWith);
         }
     }