Move event-listener to sub package (#29)

src/test/java/io/kokuwa/keycloak/metrics/junit/Prometheus.java

@@ -0,0 +1,62 @@
+package io.kokuwa.keycloak.metrics.junit;
+
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import org.keycloak.events.EventType;
+
+/**
+ * Client to access Prometheus metric values:
+ *
+ * @author Stephan Schnabel
+ */
+public class Prometheus {
+
+	private final Set<PrometheusMetric> state = new HashSet<>();
+	private final PrometheusClient client;
+
+	public Prometheus(PrometheusClient client) {
+		this.client = client;
+	}
+
+	public int userEvent(EventType type) {
+		return state.stream()
+				.filter(metric -> Objects.equals(metric.name(), "keycloak_event_user_total"))
+				.filter(metric -> Objects.equals(metric.tags().get("type"), type.toString()))
+				.mapToInt(metric -> metric.value().intValue())
+				.sum();
+	}
+
+	public int userEvent(EventType type, String realmName, String clientId) {
+		return state.stream()
+				.filter(metric -> Objects.equals(metric.name(), "keycloak_event_user_total"))
+				.filter(metric -> Objects.equals(metric.tags().get("type"), type.toString()))
+				.filter(metric -> Objects.equals(metric.tags().get("realm"), realmName))
+				.filter(metric -> Objects.equals(metric.tags().get("client"), clientId))
+				.mapToInt(metric -> metric.value().intValue())
+				.sum();
+	}
+
+	public void scrap() {
+		state.clear();
+		Stream.of(client.scrap().split("[\\r\\n]+"))
+				.filter(line -> !line.startsWith("#"))
+				.filter(line -> line.startsWith("keycloak"))
+				.map(line -> {
+					var name = line.substring(0, line.contains("{") ? line.indexOf("{") : line.lastIndexOf(" "));
+					var tags = line.contains("{")
+							? Stream.of(line.substring(line.indexOf("{") + 1, line.indexOf("}")).split(","))
+									.map(tag -> tag.split("="))
+									.filter(tag -> tag.length >= 2)
+									.collect(Collectors.toMap(tag -> tag[0], tag -> tag[1].replace("\"", "")))
+							: Map.<String, String>of();
+					var value = Double.parseDouble(line.substring(line.lastIndexOf(" ")));
+					return new PrometheusMetric(name, tags, value);
+				})
+				.forEach(state::add);
+	}
+}